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   1  // CodeMirror, copyright (c) by Marijn Haverbeke and others
   2  // Distributed under an MIT license: https://codemirror.net/5/LICENSE
   3  
   4  // This is CodeMirror (https://codemirror.net/5), a code editor
   5  // implemented in JavaScript on top of the browser's DOM.
   6  //
   7  // You can find some technical background for some of the code below
   8  // at http://marijnhaverbeke.nl/blog/#cm-internals .
   9  
  10  (function (global, factory) {
  11    typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory() :
  12    typeof define === 'function' && define.amd ? define(factory) :
  13    (global = global || self, global.CodeMirror = factory());
  14  }(this, (function () { 'use strict';
  15  
  16    // Kludges for bugs and behavior differences that can't be feature
  17    // detected are enabled based on userAgent etc sniffing.
  18    var userAgent = navigator.userAgent;
  19    var platform = navigator.platform;
  20  
  21    var gecko = /gecko\/\d/i.test(userAgent);
  22    var ie_upto10 = /MSIE \d/.test(userAgent);
  23    var ie_11up = /Trident\/(?:[7-9]|\d{2,})\..*rv:(\d+)/.exec(userAgent);
  24    var edge = /Edge\/(\d+)/.exec(userAgent);
  25    var ie = ie_upto10 || ie_11up || edge;
  26    var ie_version = ie && (ie_upto10 ? document.documentMode || 6 : +(edge || ie_11up)[1]);
  27    var webkit = !edge && /WebKit\//.test(userAgent);
  28    var qtwebkit = webkit && /Qt\/\d+\.\d+/.test(userAgent);
  29    var chrome = !edge && /Chrome\/(\d+)/.exec(userAgent);
  30    var chrome_version = chrome && +chrome[1];
  31    var presto = /Opera\//.test(userAgent);
  32    var safari = /Apple Computer/.test(navigator.vendor);
  33    var mac_geMountainLion = /Mac OS X 1\d\D([8-9]|\d\d)\D/.test(userAgent);
  34    var phantom = /PhantomJS/.test(userAgent);
  35  
  36    var ios = safari && (/Mobile\/\w+/.test(userAgent) || navigator.maxTouchPoints > 2);
  37    var android = /Android/.test(userAgent);
  38    // This is woefully incomplete. Suggestions for alternative methods welcome.
  39    var mobile = ios || android || /webOS|BlackBerry|Opera Mini|Opera Mobi|IEMobile/i.test(userAgent);
  40    var mac = ios || /Mac/.test(platform);
  41    var chromeOS = /\bCrOS\b/.test(userAgent);
  42    var windows = /win/i.test(platform);
  43  
  44    var presto_version = presto && userAgent.match(/Version\/(\d*\.\d*)/);
  45    if (presto_version) { presto_version = Number(presto_version[1]); }
  46    if (presto_version && presto_version >= 15) { presto = false; webkit = true; }
  47    // Some browsers use the wrong event properties to signal cmd/ctrl on OS X
  48    var flipCtrlCmd = mac && (qtwebkit || presto && (presto_version == null || presto_version < 12.11));
  49    var captureRightClick = gecko || (ie && ie_version >= 9);
  50  
  51    function classTest(cls) { return new RegExp("(^|\\s)" + cls + "(?:$|\\s)\\s*") }
  52  
  53    var rmClass = function(node, cls) {
  54      var current = node.className;
  55      var match = classTest(cls).exec(current);
  56      if (match) {
  57        var after = current.slice(match.index + match[0].length);
  58        node.className = current.slice(0, match.index) + (after ? match[1] + after : "");
  59      }
  60    };
  61  
  62    function removeChildren(e) {
  63      for (var count = e.childNodes.length; count > 0; --count)
  64        { e.removeChild(e.firstChild); }
  65      return e
  66    }
  67  
  68    function removeChildrenAndAdd(parent, e) {
  69      return removeChildren(parent).appendChild(e)
  70    }
  71  
  72    function elt(tag, content, className, style) {
  73      var e = document.createElement(tag);
  74      if (className) { e.className = className; }
  75      if (style) { e.style.cssText = style; }
  76      if (typeof content == "string") { e.appendChild(document.createTextNode(content)); }
  77      else if (content) { for (var i = 0; i < content.length; ++i) { e.appendChild(content[i]); } }
  78      return e
  79    }
  80    // wrapper for elt, which removes the elt from the accessibility tree
  81    function eltP(tag, content, className, style) {
  82      var e = elt(tag, content, className, style);
  83      e.setAttribute("role", "presentation");
  84      return e
  85    }
  86  
  87    var range;
  88    if (document.createRange) { range = function(node, start, end, endNode) {
  89      var r = document.createRange();
  90      r.setEnd(endNode || node, end);
  91      r.setStart(node, start);
  92      return r
  93    }; }
  94    else { range = function(node, start, end) {
  95      var r = document.body.createTextRange();
  96      try { r.moveToElementText(node.parentNode); }
  97      catch(e) { return r }
  98      r.collapse(true);
  99      r.moveEnd("character", end);
 100      r.moveStart("character", start);
 101      return r
 102    }; }
 103  
 104    function contains(parent, child) {
 105      if (child.nodeType == 3) // Android browser always returns false when child is a textnode
 106        { child = child.parentNode; }
 107      if (parent.contains)
 108        { return parent.contains(child) }
 109      do {
 110        if (child.nodeType == 11) { child = child.host; }
 111        if (child == parent) { return true }
 112      } while (child = child.parentNode)
 113    }
 114  
 115    function activeElt() {
 116      // IE and Edge may throw an "Unspecified Error" when accessing document.activeElement.
 117      // IE < 10 will throw when accessed while the page is loading or in an iframe.
 118      // IE > 9 and Edge will throw when accessed in an iframe if document.body is unavailable.
 119      var activeElement;
 120      try {
 121        activeElement = document.activeElement;
 122      } catch(e) {
 123        activeElement = document.body || null;
 124      }
 125      while (activeElement && activeElement.shadowRoot && activeElement.shadowRoot.activeElement)
 126        { activeElement = activeElement.shadowRoot.activeElement; }
 127      return activeElement
 128    }
 129  
 130    function addClass(node, cls) {
 131      var current = node.className;
 132      if (!classTest(cls).test(current)) { node.className += (current ? " " : "") + cls; }
 133    }
 134    function joinClasses(a, b) {
 135      var as = a.split(" ");
 136      for (var i = 0; i < as.length; i++)
 137        { if (as[i] && !classTest(as[i]).test(b)) { b += " " + as[i]; } }
 138      return b
 139    }
 140  
 141    var selectInput = function(node) { node.select(); };
 142    if (ios) // Mobile Safari apparently has a bug where select() is broken.
 143      { selectInput = function(node) { node.selectionStart = 0; node.selectionEnd = node.value.length; }; }
 144    else if (ie) // Suppress mysterious IE10 errors
 145      { selectInput = function(node) { try { node.select(); } catch(_e) {} }; }
 146  
 147    function bind(f) {
 148      var args = Array.prototype.slice.call(arguments, 1);
 149      return function(){return f.apply(null, args)}
 150    }
 151  
 152    function copyObj(obj, target, overwrite) {
 153      if (!target) { target = {}; }
 154      for (var prop in obj)
 155        { if (obj.hasOwnProperty(prop) && (overwrite !== false || !target.hasOwnProperty(prop)))
 156          { target[prop] = obj[prop]; } }
 157      return target
 158    }
 159  
 160    // Counts the column offset in a string, taking tabs into account.
 161    // Used mostly to find indentation.
 162    function countColumn(string, end, tabSize, startIndex, startValue) {
 163      if (end == null) {
 164        end = string.search(/[^\s\u00a0]/);
 165        if (end == -1) { end = string.length; }
 166      }
 167      for (var i = startIndex || 0, n = startValue || 0;;) {
 168        var nextTab = string.indexOf("\t", i);
 169        if (nextTab < 0 || nextTab >= end)
 170          { return n + (end - i) }
 171        n += nextTab - i;
 172        n += tabSize - (n % tabSize);
 173        i = nextTab + 1;
 174      }
 175    }
 176  
 177    var Delayed = function() {
 178      this.id = null;
 179      this.f = null;
 180      this.time = 0;
 181      this.handler = bind(this.onTimeout, this);
 182    };
 183    Delayed.prototype.onTimeout = function (self) {
 184      self.id = 0;
 185      if (self.time <= +new Date) {
 186        self.f();
 187      } else {
 188        setTimeout(self.handler, self.time - +new Date);
 189      }
 190    };
 191    Delayed.prototype.set = function (ms, f) {
 192      this.f = f;
 193      var time = +new Date + ms;
 194      if (!this.id || time < this.time) {
 195        clearTimeout(this.id);
 196        this.id = setTimeout(this.handler, ms);
 197        this.time = time;
 198      }
 199    };
 200  
 201    function indexOf(array, elt) {
 202      for (var i = 0; i < array.length; ++i)
 203        { if (array[i] == elt) { return i } }
 204      return -1
 205    }
 206  
 207    // Number of pixels added to scroller and sizer to hide scrollbar
 208    var scrollerGap = 50;
 209  
 210    // Returned or thrown by various protocols to signal 'I'm not
 211    // handling this'.
 212    var Pass = {toString: function(){return "CodeMirror.Pass"}};
 213  
 214    // Reused option objects for setSelection & friends
 215    var sel_dontScroll = {scroll: false}, sel_mouse = {origin: "*mouse"}, sel_move = {origin: "+move"};
 216  
 217    // The inverse of countColumn -- find the offset that corresponds to
 218    // a particular column.
 219    function findColumn(string, goal, tabSize) {
 220      for (var pos = 0, col = 0;;) {
 221        var nextTab = string.indexOf("\t", pos);
 222        if (nextTab == -1) { nextTab = string.length; }
 223        var skipped = nextTab - pos;
 224        if (nextTab == string.length || col + skipped >= goal)
 225          { return pos + Math.min(skipped, goal - col) }
 226        col += nextTab - pos;
 227        col += tabSize - (col % tabSize);
 228        pos = nextTab + 1;
 229        if (col >= goal) { return pos }
 230      }
 231    }
 232  
 233    var spaceStrs = [""];
 234    function spaceStr(n) {
 235      while (spaceStrs.length <= n)
 236        { spaceStrs.push(lst(spaceStrs) + " "); }
 237      return spaceStrs[n]
 238    }
 239  
 240    function lst(arr) { return arr[arr.length-1] }
 241  
 242    function map(array, f) {
 243      var out = [];
 244      for (var i = 0; i < array.length; i++) { out[i] = f(array[i], i); }
 245      return out
 246    }
 247  
 248    function insertSorted(array, value, score) {
 249      var pos = 0, priority = score(value);
 250      while (pos < array.length && score(array[pos]) <= priority) { pos++; }
 251      array.splice(pos, 0, value);
 252    }
 253  
 254    function nothing() {}
 255  
 256    function createObj(base, props) {
 257      var inst;
 258      if (Object.create) {
 259        inst = Object.create(base);
 260      } else {
 261        nothing.prototype = base;
 262        inst = new nothing();
 263      }
 264      if (props) { copyObj(props, inst); }
 265      return inst
 266    }
 267  
 268    var nonASCIISingleCaseWordChar = /[\u00df\u0587\u0590-\u05f4\u0600-\u06ff\u3040-\u309f\u30a0-\u30ff\u3400-\u4db5\u4e00-\u9fcc\uac00-\ud7af]/;
 269    function isWordCharBasic(ch) {
 270      return /\w/.test(ch) || ch > "\x80" &&
 271        (ch.toUpperCase() != ch.toLowerCase() || nonASCIISingleCaseWordChar.test(ch))
 272    }
 273    function isWordChar(ch, helper) {
 274      if (!helper) { return isWordCharBasic(ch) }
 275      if (helper.source.indexOf("\\w") > -1 && isWordCharBasic(ch)) { return true }
 276      return helper.test(ch)
 277    }
 278  
 279    function isEmpty(obj) {
 280      for (var n in obj) { if (obj.hasOwnProperty(n) && obj[n]) { return false } }
 281      return true
 282    }
 283  
 284    // Extending unicode characters. A series of a non-extending char +
 285    // any number of extending chars is treated as a single unit as far
 286    // as editing and measuring is concerned. This is not fully correct,
 287    // since some scripts/fonts/browsers also treat other configurations
 288    // of code points as a group.
 289    var extendingChars = /[\u0300-\u036f\u0483-\u0489\u0591-\u05bd\u05bf\u05c1\u05c2\u05c4\u05c5\u05c7\u0610-\u061a\u064b-\u065e\u0670\u06d6-\u06dc\u06de-\u06e4\u06e7\u06e8\u06ea-\u06ed\u0711\u0730-\u074a\u07a6-\u07b0\u07eb-\u07f3\u0816-\u0819\u081b-\u0823\u0825-\u0827\u0829-\u082d\u0900-\u0902\u093c\u0941-\u0948\u094d\u0951-\u0955\u0962\u0963\u0981\u09bc\u09be\u09c1-\u09c4\u09cd\u09d7\u09e2\u09e3\u0a01\u0a02\u0a3c\u0a41\u0a42\u0a47\u0a48\u0a4b-\u0a4d\u0a51\u0a70\u0a71\u0a75\u0a81\u0a82\u0abc\u0ac1-\u0ac5\u0ac7\u0ac8\u0acd\u0ae2\u0ae3\u0b01\u0b3c\u0b3e\u0b3f\u0b41-\u0b44\u0b4d\u0b56\u0b57\u0b62\u0b63\u0b82\u0bbe\u0bc0\u0bcd\u0bd7\u0c3e-\u0c40\u0c46-\u0c48\u0c4a-\u0c4d\u0c55\u0c56\u0c62\u0c63\u0cbc\u0cbf\u0cc2\u0cc6\u0ccc\u0ccd\u0cd5\u0cd6\u0ce2\u0ce3\u0d3e\u0d41-\u0d44\u0d4d\u0d57\u0d62\u0d63\u0dca\u0dcf\u0dd2-\u0dd4\u0dd6\u0ddf\u0e31\u0e34-\u0e3a\u0e47-\u0e4e\u0eb1\u0eb4-\u0eb9\u0ebb\u0ebc\u0ec8-\u0ecd\u0f18\u0f19\u0f35\u0f37\u0f39\u0f71-\u0f7e\u0f80-\u0f84\u0f86\u0f87\u0f90-\u0f97\u0f99-\u0fbc\u0fc6\u102d-\u1030\u1032-\u1037\u1039\u103a\u103d\u103e\u1058\u1059\u105e-\u1060\u1071-\u1074\u1082\u1085\u1086\u108d\u109d\u135f\u1712-\u1714\u1732-\u1734\u1752\u1753\u1772\u1773\u17b7-\u17bd\u17c6\u17c9-\u17d3\u17dd\u180b-\u180d\u18a9\u1920-\u1922\u1927\u1928\u1932\u1939-\u193b\u1a17\u1a18\u1a56\u1a58-\u1a5e\u1a60\u1a62\u1a65-\u1a6c\u1a73-\u1a7c\u1a7f\u1b00-\u1b03\u1b34\u1b36-\u1b3a\u1b3c\u1b42\u1b6b-\u1b73\u1b80\u1b81\u1ba2-\u1ba5\u1ba8\u1ba9\u1c2c-\u1c33\u1c36\u1c37\u1cd0-\u1cd2\u1cd4-\u1ce0\u1ce2-\u1ce8\u1ced\u1dc0-\u1de6\u1dfd-\u1dff\u200c\u200d\u20d0-\u20f0\u2cef-\u2cf1\u2de0-\u2dff\u302a-\u302f\u3099\u309a\ua66f-\ua672\ua67c\ua67d\ua6f0\ua6f1\ua802\ua806\ua80b\ua825\ua826\ua8c4\ua8e0-\ua8f1\ua926-\ua92d\ua947-\ua951\ua980-\ua982\ua9b3\ua9b6-\ua9b9\ua9bc\uaa29-\uaa2e\uaa31\uaa32\uaa35\uaa36\uaa43\uaa4c\uaab0\uaab2-\uaab4\uaab7\uaab8\uaabe\uaabf\uaac1\uabe5\uabe8\uabed\udc00-\udfff\ufb1e\ufe00-\ufe0f\ufe20-\ufe26\uff9e\uff9f]/;
 290    function isExtendingChar(ch) { return ch.charCodeAt(0) >= 768 && extendingChars.test(ch) }
 291  
 292    // Returns a number from the range [`0`; `str.length`] unless `pos` is outside that range.
 293    function skipExtendingChars(str, pos, dir) {
 294      while ((dir < 0 ? pos > 0 : pos < str.length) && isExtendingChar(str.charAt(pos))) { pos += dir; }
 295      return pos
 296    }
 297  
 298    // Returns the value from the range [`from`; `to`] that satisfies
 299    // `pred` and is closest to `from`. Assumes that at least `to`
 300    // satisfies `pred`. Supports `from` being greater than `to`.
 301    function findFirst(pred, from, to) {
 302      // At any point we are certain `to` satisfies `pred`, don't know
 303      // whether `from` does.
 304      var dir = from > to ? -1 : 1;
 305      for (;;) {
 306        if (from == to) { return from }
 307        var midF = (from + to) / 2, mid = dir < 0 ? Math.ceil(midF) : Math.floor(midF);
 308        if (mid == from) { return pred(mid) ? from : to }
 309        if (pred(mid)) { to = mid; }
 310        else { from = mid + dir; }
 311      }
 312    }
 313  
 314    // BIDI HELPERS
 315  
 316    function iterateBidiSections(order, from, to, f) {
 317      if (!order) { return f(from, to, "ltr", 0) }
 318      var found = false;
 319      for (var i = 0; i < order.length; ++i) {
 320        var part = order[i];
 321        if (part.from < to && part.to > from || from == to && part.to == from) {
 322          f(Math.max(part.from, from), Math.min(part.to, to), part.level == 1 ? "rtl" : "ltr", i);
 323          found = true;
 324        }
 325      }
 326      if (!found) { f(from, to, "ltr"); }
 327    }
 328  
 329    var bidiOther = null;
 330    function getBidiPartAt(order, ch, sticky) {
 331      var found;
 332      bidiOther = null;
 333      for (var i = 0; i < order.length; ++i) {
 334        var cur = order[i];
 335        if (cur.from < ch && cur.to > ch) { return i }
 336        if (cur.to == ch) {
 337          if (cur.from != cur.to && sticky == "before") { found = i; }
 338          else { bidiOther = i; }
 339        }
 340        if (cur.from == ch) {
 341          if (cur.from != cur.to && sticky != "before") { found = i; }
 342          else { bidiOther = i; }
 343        }
 344      }
 345      return found != null ? found : bidiOther
 346    }
 347  
 348    // Bidirectional ordering algorithm
 349    // See http://unicode.org/reports/tr9/tr9-13.html for the algorithm
 350    // that this (partially) implements.
 351  
 352    // One-char codes used for character types:
 353    // L (L):   Left-to-Right
 354    // R (R):   Right-to-Left
 355    // r (AL):  Right-to-Left Arabic
 356    // 1 (EN):  European Number
 357    // + (ES):  European Number Separator
 358    // % (ET):  European Number Terminator
 359    // n (AN):  Arabic Number
 360    // , (CS):  Common Number Separator
 361    // m (NSM): Non-Spacing Mark
 362    // b (BN):  Boundary Neutral
 363    // s (B):   Paragraph Separator
 364    // t (S):   Segment Separator
 365    // w (WS):  Whitespace
 366    // N (ON):  Other Neutrals
 367  
 368    // Returns null if characters are ordered as they appear
 369    // (left-to-right), or an array of sections ({from, to, level}
 370    // objects) in the order in which they occur visually.
 371    var bidiOrdering = (function() {
 372      // Character types for codepoints 0 to 0xff
 373      var lowTypes = "bbbbbbbbbtstwsbbbbbbbbbbbbbbssstwNN%%%NNNNNN,N,N1111111111NNNNNNNLLLLLLLLLLLLLLLLLLLLLLLLLLNNNNNNLLLLLLLLLLLLLLLLLLLLLLLLLLNNNNbbbbbbsbbbbbbbbbbbbbbbbbbbbbbbbbb,N%%%%NNNNLNNNNN%%11NLNNN1LNNNNNLLLLLLLLLLLLLLLLLLLLLLLNLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLN";
 374      // Character types for codepoints 0x600 to 0x6f9
 375      var arabicTypes = "nnnnnnNNr%%r,rNNmmmmmmmmmmmrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrmmmmmmmmmmmmmmmmmmmmmnnnnnnnnnn%nnrrrmrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrmmmmmmmnNmmmmmmrrmmNmmmmrr1111111111";
 376      function charType(code) {
 377        if (code <= 0xf7) { return lowTypes.charAt(code) }
 378        else if (0x590 <= code && code <= 0x5f4) { return "R" }
 379        else if (0x600 <= code && code <= 0x6f9) { return arabicTypes.charAt(code - 0x600) }
 380        else if (0x6ee <= code && code <= 0x8ac) { return "r" }
 381        else if (0x2000 <= code && code <= 0x200b) { return "w" }
 382        else if (code == 0x200c) { return "b" }
 383        else { return "L" }
 384      }
 385  
 386      var bidiRE = /[\u0590-\u05f4\u0600-\u06ff\u0700-\u08ac]/;
 387      var isNeutral = /[stwN]/, isStrong = /[LRr]/, countsAsLeft = /[Lb1n]/, countsAsNum = /[1n]/;
 388  
 389      function BidiSpan(level, from, to) {
 390        this.level = level;
 391        this.from = from; this.to = to;
 392      }
 393  
 394      return function(str, direction) {
 395        var outerType = direction == "ltr" ? "L" : "R";
 396  
 397        if (str.length == 0 || direction == "ltr" && !bidiRE.test(str)) { return false }
 398        var len = str.length, types = [];
 399        for (var i = 0; i < len; ++i)
 400          { types.push(charType(str.charCodeAt(i))); }
 401  
 402        // W1. Examine each non-spacing mark (NSM) in the level run, and
 403        // change the type of the NSM to the type of the previous
 404        // character. If the NSM is at the start of the level run, it will
 405        // get the type of sor.
 406        for (var i$1 = 0, prev = outerType; i$1 < len; ++i$1) {
 407          var type = types[i$1];
 408          if (type == "m") { types[i$1] = prev; }
 409          else { prev = type; }
 410        }
 411  
 412        // W2. Search backwards from each instance of a European number
 413        // until the first strong type (R, L, AL, or sor) is found. If an
 414        // AL is found, change the type of the European number to Arabic
 415        // number.
 416        // W3. Change all ALs to R.
 417        for (var i$2 = 0, cur = outerType; i$2 < len; ++i$2) {
 418          var type$1 = types[i$2];
 419          if (type$1 == "1" && cur == "r") { types[i$2] = "n"; }
 420          else if (isStrong.test(type$1)) { cur = type$1; if (type$1 == "r") { types[i$2] = "R"; } }
 421        }
 422  
 423        // W4. A single European separator between two European numbers
 424        // changes to a European number. A single common separator between
 425        // two numbers of the same type changes to that type.
 426        for (var i$3 = 1, prev$1 = types[0]; i$3 < len - 1; ++i$3) {
 427          var type$2 = types[i$3];
 428          if (type$2 == "+" && prev$1 == "1" && types[i$3+1] == "1") { types[i$3] = "1"; }
 429          else if (type$2 == "," && prev$1 == types[i$3+1] &&
 430                   (prev$1 == "1" || prev$1 == "n")) { types[i$3] = prev$1; }
 431          prev$1 = type$2;
 432        }
 433  
 434        // W5. A sequence of European terminators adjacent to European
 435        // numbers changes to all European numbers.
 436        // W6. Otherwise, separators and terminators change to Other
 437        // Neutral.
 438        for (var i$4 = 0; i$4 < len; ++i$4) {
 439          var type$3 = types[i$4];
 440          if (type$3 == ",") { types[i$4] = "N"; }
 441          else if (type$3 == "%") {
 442            var end = (void 0);
 443            for (end = i$4 + 1; end < len && types[end] == "%"; ++end) {}
 444            var replace = (i$4 && types[i$4-1] == "!") || (end < len && types[end] == "1") ? "1" : "N";
 445            for (var j = i$4; j < end; ++j) { types[j] = replace; }
 446            i$4 = end - 1;
 447          }
 448        }
 449  
 450        // W7. Search backwards from each instance of a European number
 451        // until the first strong type (R, L, or sor) is found. If an L is
 452        // found, then change the type of the European number to L.
 453        for (var i$5 = 0, cur$1 = outerType; i$5 < len; ++i$5) {
 454          var type$4 = types[i$5];
 455          if (cur$1 == "L" && type$4 == "1") { types[i$5] = "L"; }
 456          else if (isStrong.test(type$4)) { cur$1 = type$4; }
 457        }
 458  
 459        // N1. A sequence of neutrals takes the direction of the
 460        // surrounding strong text if the text on both sides has the same
 461        // direction. European and Arabic numbers act as if they were R in
 462        // terms of their influence on neutrals. Start-of-level-run (sor)
 463        // and end-of-level-run (eor) are used at level run boundaries.
 464        // N2. Any remaining neutrals take the embedding direction.
 465        for (var i$6 = 0; i$6 < len; ++i$6) {
 466          if (isNeutral.test(types[i$6])) {
 467            var end$1 = (void 0);
 468            for (end$1 = i$6 + 1; end$1 < len && isNeutral.test(types[end$1]); ++end$1) {}
 469            var before = (i$6 ? types[i$6-1] : outerType) == "L";
 470            var after = (end$1 < len ? types[end$1] : outerType) == "L";
 471            var replace$1 = before == after ? (before ? "L" : "R") : outerType;
 472            for (var j$1 = i$6; j$1 < end$1; ++j$1) { types[j$1] = replace$1; }
 473            i$6 = end$1 - 1;
 474          }
 475        }
 476  
 477        // Here we depart from the documented algorithm, in order to avoid
 478        // building up an actual levels array. Since there are only three
 479        // levels (0, 1, 2) in an implementation that doesn't take
 480        // explicit embedding into account, we can build up the order on
 481        // the fly, without following the level-based algorithm.
 482        var order = [], m;
 483        for (var i$7 = 0; i$7 < len;) {
 484          if (countsAsLeft.test(types[i$7])) {
 485            var start = i$7;
 486            for (++i$7; i$7 < len && countsAsLeft.test(types[i$7]); ++i$7) {}
 487            order.push(new BidiSpan(0, start, i$7));
 488          } else {
 489            var pos = i$7, at = order.length, isRTL = direction == "rtl" ? 1 : 0;
 490            for (++i$7; i$7 < len && types[i$7] != "L"; ++i$7) {}
 491            for (var j$2 = pos; j$2 < i$7;) {
 492              if (countsAsNum.test(types[j$2])) {
 493                if (pos < j$2) { order.splice(at, 0, new BidiSpan(1, pos, j$2)); at += isRTL; }
 494                var nstart = j$2;
 495                for (++j$2; j$2 < i$7 && countsAsNum.test(types[j$2]); ++j$2) {}
 496                order.splice(at, 0, new BidiSpan(2, nstart, j$2));
 497                at += isRTL;
 498                pos = j$2;
 499              } else { ++j$2; }
 500            }
 501            if (pos < i$7) { order.splice(at, 0, new BidiSpan(1, pos, i$7)); }
 502          }
 503        }
 504        if (direction == "ltr") {
 505          if (order[0].level == 1 && (m = str.match(/^\s+/))) {
 506            order[0].from = m[0].length;
 507            order.unshift(new BidiSpan(0, 0, m[0].length));
 508          }
 509          if (lst(order).level == 1 && (m = str.match(/\s+$/))) {
 510            lst(order).to -= m[0].length;
 511            order.push(new BidiSpan(0, len - m[0].length, len));
 512          }
 513        }
 514  
 515        return direction == "rtl" ? order.reverse() : order
 516      }
 517    })();
 518  
 519    // Get the bidi ordering for the given line (and cache it). Returns
 520    // false for lines that are fully left-to-right, and an array of
 521    // BidiSpan objects otherwise.
 522    function getOrder(line, direction) {
 523      var order = line.order;
 524      if (order == null) { order = line.order = bidiOrdering(line.text, direction); }
 525      return order
 526    }
 527  
 528    // EVENT HANDLING
 529  
 530    // Lightweight event framework. on/off also work on DOM nodes,
 531    // registering native DOM handlers.
 532  
 533    var noHandlers = [];
 534  
 535    var on = function(emitter, type, f) {
 536      if (emitter.addEventListener) {
 537        emitter.addEventListener(type, f, false);
 538      } else if (emitter.attachEvent) {
 539        emitter.attachEvent("on" + type, f);
 540      } else {
 541        var map = emitter._handlers || (emitter._handlers = {});
 542        map[type] = (map[type] || noHandlers).concat(f);
 543      }
 544    };
 545  
 546    function getHandlers(emitter, type) {
 547      return emitter._handlers && emitter._handlers[type] || noHandlers
 548    }
 549  
 550    function off(emitter, type, f) {
 551      if (emitter.removeEventListener) {
 552        emitter.removeEventListener(type, f, false);
 553      } else if (emitter.detachEvent) {
 554        emitter.detachEvent("on" + type, f);
 555      } else {
 556        var map = emitter._handlers, arr = map && map[type];
 557        if (arr) {
 558          var index = indexOf(arr, f);
 559          if (index > -1)
 560            { map[type] = arr.slice(0, index).concat(arr.slice(index + 1)); }
 561        }
 562      }
 563    }
 564  
 565    function signal(emitter, type /*, values...*/) {
 566      var handlers = getHandlers(emitter, type);
 567      if (!handlers.length) { return }
 568      var args = Array.prototype.slice.call(arguments, 2);
 569      for (var i = 0; i < handlers.length; ++i) { handlers[i].apply(null, args); }
 570    }
 571  
 572    // The DOM events that CodeMirror handles can be overridden by
 573    // registering a (non-DOM) handler on the editor for the event name,
 574    // and preventDefault-ing the event in that handler.
 575    function signalDOMEvent(cm, e, override) {
 576      if (typeof e == "string")
 577        { e = {type: e, preventDefault: function() { this.defaultPrevented = true; }}; }
 578      signal(cm, override || e.type, cm, e);
 579      return e_defaultPrevented(e) || e.codemirrorIgnore
 580    }
 581  
 582    function signalCursorActivity(cm) {
 583      var arr = cm._handlers && cm._handlers.cursorActivity;
 584      if (!arr) { return }
 585      var set = cm.curOp.cursorActivityHandlers || (cm.curOp.cursorActivityHandlers = []);
 586      for (var i = 0; i < arr.length; ++i) { if (indexOf(set, arr[i]) == -1)
 587        { set.push(arr[i]); } }
 588    }
 589  
 590    function hasHandler(emitter, type) {
 591      return getHandlers(emitter, type).length > 0
 592    }
 593  
 594    // Add on and off methods to a constructor's prototype, to make
 595    // registering events on such objects more convenient.
 596    function eventMixin(ctor) {
 597      ctor.prototype.on = function(type, f) {on(this, type, f);};
 598      ctor.prototype.off = function(type, f) {off(this, type, f);};
 599    }
 600  
 601    // Due to the fact that we still support jurassic IE versions, some
 602    // compatibility wrappers are needed.
 603  
 604    function e_preventDefault(e) {
 605      if (e.preventDefault) { e.preventDefault(); }
 606      else { e.returnValue = false; }
 607    }
 608    function e_stopPropagation(e) {
 609      if (e.stopPropagation) { e.stopPropagation(); }
 610      else { e.cancelBubble = true; }
 611    }
 612    function e_defaultPrevented(e) {
 613      return e.defaultPrevented != null ? e.defaultPrevented : e.returnValue == false
 614    }
 615    function e_stop(e) {e_preventDefault(e); e_stopPropagation(e);}
 616  
 617    function e_target(e) {return e.target || e.srcElement}
 618    function e_button(e) {
 619      var b = e.which;
 620      if (b == null) {
 621        if (e.button & 1) { b = 1; }
 622        else if (e.button & 2) { b = 3; }
 623        else if (e.button & 4) { b = 2; }
 624      }
 625      if (mac && e.ctrlKey && b == 1) { b = 3; }
 626      return b
 627    }
 628  
 629    // Detect drag-and-drop
 630    var dragAndDrop = function() {
 631      // There is *some* kind of drag-and-drop support in IE6-8, but I
 632      // couldn't get it to work yet.
 633      if (ie && ie_version < 9) { return false }
 634      var div = elt('div');
 635      return "draggable" in div || "dragDrop" in div
 636    }();
 637  
 638    var zwspSupported;
 639    function zeroWidthElement(measure) {
 640      if (zwspSupported == null) {
 641        var test = elt("span", "\u200b");
 642        removeChildrenAndAdd(measure, elt("span", [test, document.createTextNode("x")]));
 643        if (measure.firstChild.offsetHeight != 0)
 644          { zwspSupported = test.offsetWidth <= 1 && test.offsetHeight > 2 && !(ie && ie_version < 8); }
 645      }
 646      var node = zwspSupported ? elt("span", "\u200b") :
 647        elt("span", "\u00a0", null, "display: inline-block; width: 1px; margin-right: -1px");
 648      node.setAttribute("cm-text", "");
 649      return node
 650    }
 651  
 652    // Feature-detect IE's crummy client rect reporting for bidi text
 653    var badBidiRects;
 654    function hasBadBidiRects(measure) {
 655      if (badBidiRects != null) { return badBidiRects }
 656      var txt = removeChildrenAndAdd(measure, document.createTextNode("A\u062eA"));
 657      var r0 = range(txt, 0, 1).getBoundingClientRect();
 658      var r1 = range(txt, 1, 2).getBoundingClientRect();
 659      removeChildren(measure);
 660      if (!r0 || r0.left == r0.right) { return false } // Safari returns null in some cases (#2780)
 661      return badBidiRects = (r1.right - r0.right < 3)
 662    }
 663  
 664    // See if "".split is the broken IE version, if so, provide an
 665    // alternative way to split lines.
 666    var splitLinesAuto = "\n\nb".split(/\n/).length != 3 ? function (string) {
 667      var pos = 0, result = [], l = string.length;
 668      while (pos <= l) {
 669        var nl = string.indexOf("\n", pos);
 670        if (nl == -1) { nl = string.length; }
 671        var line = string.slice(pos, string.charAt(nl - 1) == "\r" ? nl - 1 : nl);
 672        var rt = line.indexOf("\r");
 673        if (rt != -1) {
 674          result.push(line.slice(0, rt));
 675          pos += rt + 1;
 676        } else {
 677          result.push(line);
 678          pos = nl + 1;
 679        }
 680      }
 681      return result
 682    } : function (string) { return string.split(/\r\n?|\n/); };
 683  
 684    var hasSelection = window.getSelection ? function (te) {
 685      try { return te.selectionStart != te.selectionEnd }
 686      catch(e) { return false }
 687    } : function (te) {
 688      var range;
 689      try {range = te.ownerDocument.selection.createRange();}
 690      catch(e) {}
 691      if (!range || range.parentElement() != te) { return false }
 692      return range.compareEndPoints("StartToEnd", range) != 0
 693    };
 694  
 695    var hasCopyEvent = (function () {
 696      var e = elt("div");
 697      if ("oncopy" in e) { return true }
 698      e.setAttribute("oncopy", "return;");
 699      return typeof e.oncopy == "function"
 700    })();
 701  
 702    var badZoomedRects = null;
 703    function hasBadZoomedRects(measure) {
 704      if (badZoomedRects != null) { return badZoomedRects }
 705      var node = removeChildrenAndAdd(measure, elt("span", "x"));
 706      var normal = node.getBoundingClientRect();
 707      var fromRange = range(node, 0, 1).getBoundingClientRect();
 708      return badZoomedRects = Math.abs(normal.left - fromRange.left) > 1
 709    }
 710  
 711    // Known modes, by name and by MIME
 712    var modes = {}, mimeModes = {};
 713  
 714    // Extra arguments are stored as the mode's dependencies, which is
 715    // used by (legacy) mechanisms like loadmode.js to automatically
 716    // load a mode. (Preferred mechanism is the require/define calls.)
 717    function defineMode(name, mode) {
 718      if (arguments.length > 2)
 719        { mode.dependencies = Array.prototype.slice.call(arguments, 2); }
 720      modes[name] = mode;
 721    }
 722  
 723    function defineMIME(mime, spec) {
 724      mimeModes[mime] = spec;
 725    }
 726  
 727    // Given a MIME type, a {name, ...options} config object, or a name
 728    // string, return a mode config object.
 729    function resolveMode(spec) {
 730      if (typeof spec == "string" && mimeModes.hasOwnProperty(spec)) {
 731        spec = mimeModes[spec];
 732      } else if (spec && typeof spec.name == "string" && mimeModes.hasOwnProperty(spec.name)) {
 733        var found = mimeModes[spec.name];
 734        if (typeof found == "string") { found = {name: found}; }
 735        spec = createObj(found, spec);
 736        spec.name = found.name;
 737      } else if (typeof spec == "string" && /^[\w\-]+\/[\w\-]+\+xml$/.test(spec)) {
 738        return resolveMode("application/xml")
 739      } else if (typeof spec == "string" && /^[\w\-]+\/[\w\-]+\+json$/.test(spec)) {
 740        return resolveMode("application/json")
 741      }
 742      if (typeof spec == "string") { return {name: spec} }
 743      else { return spec || {name: "null"} }
 744    }
 745  
 746    // Given a mode spec (anything that resolveMode accepts), find and
 747    // initialize an actual mode object.
 748    function getMode(options, spec) {
 749      spec = resolveMode(spec);
 750      var mfactory = modes[spec.name];
 751      if (!mfactory) { return getMode(options, "text/plain") }
 752      var modeObj = mfactory(options, spec);
 753      if (modeExtensions.hasOwnProperty(spec.name)) {
 754        var exts = modeExtensions[spec.name];
 755        for (var prop in exts) {
 756          if (!exts.hasOwnProperty(prop)) { continue }
 757          if (modeObj.hasOwnProperty(prop)) { modeObj["_" + prop] = modeObj[prop]; }
 758          modeObj[prop] = exts[prop];
 759        }
 760      }
 761      modeObj.name = spec.name;
 762      if (spec.helperType) { modeObj.helperType = spec.helperType; }
 763      if (spec.modeProps) { for (var prop$1 in spec.modeProps)
 764        { modeObj[prop$1] = spec.modeProps[prop$1]; } }
 765  
 766      return modeObj
 767    }
 768  
 769    // This can be used to attach properties to mode objects from
 770    // outside the actual mode definition.
 771    var modeExtensions = {};
 772    function extendMode(mode, properties) {
 773      var exts = modeExtensions.hasOwnProperty(mode) ? modeExtensions[mode] : (modeExtensions[mode] = {});
 774      copyObj(properties, exts);
 775    }
 776  
 777    function copyState(mode, state) {
 778      if (state === true) { return state }
 779      if (mode.copyState) { return mode.copyState(state) }
 780      var nstate = {};
 781      for (var n in state) {
 782        var val = state[n];
 783        if (val instanceof Array) { val = val.concat([]); }
 784        nstate[n] = val;
 785      }
 786      return nstate
 787    }
 788  
 789    // Given a mode and a state (for that mode), find the inner mode and
 790    // state at the position that the state refers to.
 791    function innerMode(mode, state) {
 792      var info;
 793      while (mode.innerMode) {
 794        info = mode.innerMode(state);
 795        if (!info || info.mode == mode) { break }
 796        state = info.state;
 797        mode = info.mode;
 798      }
 799      return info || {mode: mode, state: state}
 800    }
 801  
 802    function startState(mode, a1, a2) {
 803      return mode.startState ? mode.startState(a1, a2) : true
 804    }
 805  
 806    // STRING STREAM
 807  
 808    // Fed to the mode parsers, provides helper functions to make
 809    // parsers more succinct.
 810  
 811    var StringStream = function(string, tabSize, lineOracle) {
 812      this.pos = this.start = 0;
 813      this.string = string;
 814      this.tabSize = tabSize || 8;
 815      this.lastColumnPos = this.lastColumnValue = 0;
 816      this.lineStart = 0;
 817      this.lineOracle = lineOracle;
 818    };
 819  
 820    StringStream.prototype.eol = function () {return this.pos >= this.string.length};
 821    StringStream.prototype.sol = function () {return this.pos == this.lineStart};
 822    StringStream.prototype.peek = function () {return this.string.charAt(this.pos) || undefined};
 823    StringStream.prototype.next = function () {
 824      if (this.pos < this.string.length)
 825        { return this.string.charAt(this.pos++) }
 826    };
 827    StringStream.prototype.eat = function (match) {
 828      var ch = this.string.charAt(this.pos);
 829      var ok;
 830      if (typeof match == "string") { ok = ch == match; }
 831      else { ok = ch && (match.test ? match.test(ch) : match(ch)); }
 832      if (ok) {++this.pos; return ch}
 833    };
 834    StringStream.prototype.eatWhile = function (match) {
 835      var start = this.pos;
 836      while (this.eat(match)){}
 837      return this.pos > start
 838    };
 839    StringStream.prototype.eatSpace = function () {
 840      var start = this.pos;
 841      while (/[\s\u00a0]/.test(this.string.charAt(this.pos))) { ++this.pos; }
 842      return this.pos > start
 843    };
 844    StringStream.prototype.skipToEnd = function () {this.pos = this.string.length;};
 845    StringStream.prototype.skipTo = function (ch) {
 846      var found = this.string.indexOf(ch, this.pos);
 847      if (found > -1) {this.pos = found; return true}
 848    };
 849    StringStream.prototype.backUp = function (n) {this.pos -= n;};
 850    StringStream.prototype.column = function () {
 851      if (this.lastColumnPos < this.start) {
 852        this.lastColumnValue = countColumn(this.string, this.start, this.tabSize, this.lastColumnPos, this.lastColumnValue);
 853        this.lastColumnPos = this.start;
 854      }
 855      return this.lastColumnValue - (this.lineStart ? countColumn(this.string, this.lineStart, this.tabSize) : 0)
 856    };
 857    StringStream.prototype.indentation = function () {
 858      return countColumn(this.string, null, this.tabSize) -
 859        (this.lineStart ? countColumn(this.string, this.lineStart, this.tabSize) : 0)
 860    };
 861    StringStream.prototype.match = function (pattern, consume, caseInsensitive) {
 862      if (typeof pattern == "string") {
 863        var cased = function (str) { return caseInsensitive ? str.toLowerCase() : str; };
 864        var substr = this.string.substr(this.pos, pattern.length);
 865        if (cased(substr) == cased(pattern)) {
 866          if (consume !== false) { this.pos += pattern.length; }
 867          return true
 868        }
 869      } else {
 870        var match = this.string.slice(this.pos).match(pattern);
 871        if (match && match.index > 0) { return null }
 872        if (match && consume !== false) { this.pos += match[0].length; }
 873        return match
 874      }
 875    };
 876    StringStream.prototype.current = function (){return this.string.slice(this.start, this.pos)};
 877    StringStream.prototype.hideFirstChars = function (n, inner) {
 878      this.lineStart += n;
 879      try { return inner() }
 880      finally { this.lineStart -= n; }
 881    };
 882    StringStream.prototype.lookAhead = function (n) {
 883      var oracle = this.lineOracle;
 884      return oracle && oracle.lookAhead(n)
 885    };
 886    StringStream.prototype.baseToken = function () {
 887      var oracle = this.lineOracle;
 888      return oracle && oracle.baseToken(this.pos)
 889    };
 890  
 891    // Find the line object corresponding to the given line number.
 892    function getLine(doc, n) {
 893      n -= doc.first;
 894      if (n < 0 || n >= doc.size) { throw new Error("There is no line " + (n + doc.first) + " in the document.") }
 895      var chunk = doc;
 896      while (!chunk.lines) {
 897        for (var i = 0;; ++i) {
 898          var child = chunk.children[i], sz = child.chunkSize();
 899          if (n < sz) { chunk = child; break }
 900          n -= sz;
 901        }
 902      }
 903      return chunk.lines[n]
 904    }
 905  
 906    // Get the part of a document between two positions, as an array of
 907    // strings.
 908    function getBetween(doc, start, end) {
 909      var out = [], n = start.line;
 910      doc.iter(start.line, end.line + 1, function (line) {
 911        var text = line.text;
 912        if (n == end.line) { text = text.slice(0, end.ch); }
 913        if (n == start.line) { text = text.slice(start.ch); }
 914        out.push(text);
 915        ++n;
 916      });
 917      return out
 918    }
 919    // Get the lines between from and to, as array of strings.
 920    function getLines(doc, from, to) {
 921      var out = [];
 922      doc.iter(from, to, function (line) { out.push(line.text); }); // iter aborts when callback returns truthy value
 923      return out
 924    }
 925  
 926    // Update the height of a line, propagating the height change
 927    // upwards to parent nodes.
 928    function updateLineHeight(line, height) {
 929      var diff = height - line.height;
 930      if (diff) { for (var n = line; n; n = n.parent) { n.height += diff; } }
 931    }
 932  
 933    // Given a line object, find its line number by walking up through
 934    // its parent links.
 935    function lineNo(line) {
 936      if (line.parent == null) { return null }
 937      var cur = line.parent, no = indexOf(cur.lines, line);
 938      for (var chunk = cur.parent; chunk; cur = chunk, chunk = chunk.parent) {
 939        for (var i = 0;; ++i) {
 940          if (chunk.children[i] == cur) { break }
 941          no += chunk.children[i].chunkSize();
 942        }
 943      }
 944      return no + cur.first
 945    }
 946  
 947    // Find the line at the given vertical position, using the height
 948    // information in the document tree.
 949    function lineAtHeight(chunk, h) {
 950      var n = chunk.first;
 951      outer: do {
 952        for (var i$1 = 0; i$1 < chunk.children.length; ++i$1) {
 953          var child = chunk.children[i$1], ch = child.height;
 954          if (h < ch) { chunk = child; continue outer }
 955          h -= ch;
 956          n += child.chunkSize();
 957        }
 958        return n
 959      } while (!chunk.lines)
 960      var i = 0;
 961      for (; i < chunk.lines.length; ++i) {
 962        var line = chunk.lines[i], lh = line.height;
 963        if (h < lh) { break }
 964        h -= lh;
 965      }
 966      return n + i
 967    }
 968  
 969    function isLine(doc, l) {return l >= doc.first && l < doc.first + doc.size}
 970  
 971    function lineNumberFor(options, i) {
 972      return String(options.lineNumberFormatter(i + options.firstLineNumber))
 973    }
 974  
 975    // A Pos instance represents a position within the text.
 976    function Pos(line, ch, sticky) {
 977      if ( sticky === void 0 ) sticky = null;
 978  
 979      if (!(this instanceof Pos)) { return new Pos(line, ch, sticky) }
 980      this.line = line;
 981      this.ch = ch;
 982      this.sticky = sticky;
 983    }
 984  
 985    // Compare two positions, return 0 if they are the same, a negative
 986    // number when a is less, and a positive number otherwise.
 987    function cmp(a, b) { return a.line - b.line || a.ch - b.ch }
 988  
 989    function equalCursorPos(a, b) { return a.sticky == b.sticky && cmp(a, b) == 0 }
 990  
 991    function copyPos(x) {return Pos(x.line, x.ch)}
 992    function maxPos(a, b) { return cmp(a, b) < 0 ? b : a }
 993    function minPos(a, b) { return cmp(a, b) < 0 ? a : b }
 994  
 995    // Most of the external API clips given positions to make sure they
 996    // actually exist within the document.
 997    function clipLine(doc, n) {return Math.max(doc.first, Math.min(n, doc.first + doc.size - 1))}
 998    function clipPos(doc, pos) {
 999      if (pos.line < doc.first) { return Pos(doc.first, 0) }
1000      var last = doc.first + doc.size - 1;
1001      if (pos.line > last) { return Pos(last, getLine(doc, last).text.length) }
1002      return clipToLen(pos, getLine(doc, pos.line).text.length)
1003    }
1004    function clipToLen(pos, linelen) {
1005      var ch = pos.ch;
1006      if (ch == null || ch > linelen) { return Pos(pos.line, linelen) }
1007      else if (ch < 0) { return Pos(pos.line, 0) }
1008      else { return pos }
1009    }
1010    function clipPosArray(doc, array) {
1011      var out = [];
1012      for (var i = 0; i < array.length; i++) { out[i] = clipPos(doc, array[i]); }
1013      return out
1014    }
1015  
1016    var SavedContext = function(state, lookAhead) {
1017      this.state = state;
1018      this.lookAhead = lookAhead;
1019    };
1020  
1021    var Context = function(doc, state, line, lookAhead) {
1022      this.state = state;
1023      this.doc = doc;
1024      this.line = line;
1025      this.maxLookAhead = lookAhead || 0;
1026      this.baseTokens = null;
1027      this.baseTokenPos = 1;
1028    };
1029  
1030    Context.prototype.lookAhead = function (n) {
1031      var line = this.doc.getLine(this.line + n);
1032      if (line != null && n > this.maxLookAhead) { this.maxLookAhead = n; }
1033      return line
1034    };
1035  
1036    Context.prototype.baseToken = function (n) {
1037      if (!this.baseTokens) { return null }
1038      while (this.baseTokens[this.baseTokenPos] <= n)
1039        { this.baseTokenPos += 2; }
1040      var type = this.baseTokens[this.baseTokenPos + 1];
1041      return {type: type && type.replace(/( |^)overlay .*/, ""),
1042              size: this.baseTokens[this.baseTokenPos] - n}
1043    };
1044  
1045    Context.prototype.nextLine = function () {
1046      this.line++;
1047      if (this.maxLookAhead > 0) { this.maxLookAhead--; }
1048    };
1049  
1050    Context.fromSaved = function (doc, saved, line) {
1051      if (saved instanceof SavedContext)
1052        { return new Context(doc, copyState(doc.mode, saved.state), line, saved.lookAhead) }
1053      else
1054        { return new Context(doc, copyState(doc.mode, saved), line) }
1055    };
1056  
1057    Context.prototype.save = function (copy) {
1058      var state = copy !== false ? copyState(this.doc.mode, this.state) : this.state;
1059      return this.maxLookAhead > 0 ? new SavedContext(state, this.maxLookAhead) : state
1060    };
1061  
1062  
1063    // Compute a style array (an array starting with a mode generation
1064    // -- for invalidation -- followed by pairs of end positions and
1065    // style strings), which is used to highlight the tokens on the
1066    // line.
1067    function highlightLine(cm, line, context, forceToEnd) {
1068      // A styles array always starts with a number identifying the
1069      // mode/overlays that it is based on (for easy invalidation).
1070      var st = [cm.state.modeGen], lineClasses = {};
1071      // Compute the base array of styles
1072      runMode(cm, line.text, cm.doc.mode, context, function (end, style) { return st.push(end, style); },
1073              lineClasses, forceToEnd);
1074      var state = context.state;
1075  
1076      // Run overlays, adjust style array.
1077      var loop = function ( o ) {
1078        context.baseTokens = st;
1079        var overlay = cm.state.overlays[o], i = 1, at = 0;
1080        context.state = true;
1081        runMode(cm, line.text, overlay.mode, context, function (end, style) {
1082          var start = i;
1083          // Ensure there's a token end at the current position, and that i points at it
1084          while (at < end) {
1085            var i_end = st[i];
1086            if (i_end > end)
1087              { st.splice(i, 1, end, st[i+1], i_end); }
1088            i += 2;
1089            at = Math.min(end, i_end);
1090          }
1091          if (!style) { return }
1092          if (overlay.opaque) {
1093            st.splice(start, i - start, end, "overlay " + style);
1094            i = start + 2;
1095          } else {
1096            for (; start < i; start += 2) {
1097              var cur = st[start+1];
1098              st[start+1] = (cur ? cur + " " : "") + "overlay " + style;
1099            }
1100          }
1101        }, lineClasses);
1102        context.state = state;
1103        context.baseTokens = null;
1104        context.baseTokenPos = 1;
1105      };
1106  
1107      for (var o = 0; o < cm.state.overlays.length; ++o) loop( o );
1108  
1109      return {styles: st, classes: lineClasses.bgClass || lineClasses.textClass ? lineClasses : null}
1110    }
1111  
1112    function getLineStyles(cm, line, updateFrontier) {
1113      if (!line.styles || line.styles[0] != cm.state.modeGen) {
1114        var context = getContextBefore(cm, lineNo(line));
1115        var resetState = line.text.length > cm.options.maxHighlightLength && copyState(cm.doc.mode, context.state);
1116        var result = highlightLine(cm, line, context);
1117        if (resetState) { context.state = resetState; }
1118        line.stateAfter = context.save(!resetState);
1119        line.styles = result.styles;
1120        if (result.classes) { line.styleClasses = result.classes; }
1121        else if (line.styleClasses) { line.styleClasses = null; }
1122        if (updateFrontier === cm.doc.highlightFrontier)
1123          { cm.doc.modeFrontier = Math.max(cm.doc.modeFrontier, ++cm.doc.highlightFrontier); }
1124      }
1125      return line.styles
1126    }
1127  
1128    function getContextBefore(cm, n, precise) {
1129      var doc = cm.doc, display = cm.display;
1130      if (!doc.mode.startState) { return new Context(doc, true, n) }
1131      var start = findStartLine(cm, n, precise);
1132      var saved = start > doc.first && getLine(doc, start - 1).stateAfter;
1133      var context = saved ? Context.fromSaved(doc, saved, start) : new Context(doc, startState(doc.mode), start);
1134  
1135      doc.iter(start, n, function (line) {
1136        processLine(cm, line.text, context);
1137        var pos = context.line;
1138        line.stateAfter = pos == n - 1 || pos % 5 == 0 || pos >= display.viewFrom && pos < display.viewTo ? context.save() : null;
1139        context.nextLine();
1140      });
1141      if (precise) { doc.modeFrontier = context.line; }
1142      return context
1143    }
1144  
1145    // Lightweight form of highlight -- proceed over this line and
1146    // update state, but don't save a style array. Used for lines that
1147    // aren't currently visible.
1148    function processLine(cm, text, context, startAt) {
1149      var mode = cm.doc.mode;
1150      var stream = new StringStream(text, cm.options.tabSize, context);
1151      stream.start = stream.pos = startAt || 0;
1152      if (text == "") { callBlankLine(mode, context.state); }
1153      while (!stream.eol()) {
1154        readToken(mode, stream, context.state);
1155        stream.start = stream.pos;
1156      }
1157    }
1158  
1159    function callBlankLine(mode, state) {
1160      if (mode.blankLine) { return mode.blankLine(state) }
1161      if (!mode.innerMode) { return }
1162      var inner = innerMode(mode, state);
1163      if (inner.mode.blankLine) { return inner.mode.blankLine(inner.state) }
1164    }
1165  
1166    function readToken(mode, stream, state, inner) {
1167      for (var i = 0; i < 10; i++) {
1168        if (inner) { inner[0] = innerMode(mode, state).mode; }
1169        var style = mode.token(stream, state);
1170        if (stream.pos > stream.start) { return style }
1171      }
1172      throw new Error("Mode " + mode.name + " failed to advance stream.")
1173    }
1174  
1175    var Token = function(stream, type, state) {
1176      this.start = stream.start; this.end = stream.pos;
1177      this.string = stream.current();
1178      this.type = type || null;
1179      this.state = state;
1180    };
1181  
1182    // Utility for getTokenAt and getLineTokens
1183    function takeToken(cm, pos, precise, asArray) {
1184      var doc = cm.doc, mode = doc.mode, style;
1185      pos = clipPos(doc, pos);
1186      var line = getLine(doc, pos.line), context = getContextBefore(cm, pos.line, precise);
1187      var stream = new StringStream(line.text, cm.options.tabSize, context), tokens;
1188      if (asArray) { tokens = []; }
1189      while ((asArray || stream.pos < pos.ch) && !stream.eol()) {
1190        stream.start = stream.pos;
1191        style = readToken(mode, stream, context.state);
1192        if (asArray) { tokens.push(new Token(stream, style, copyState(doc.mode, context.state))); }
1193      }
1194      return asArray ? tokens : new Token(stream, style, context.state)
1195    }
1196  
1197    function extractLineClasses(type, output) {
1198      if (type) { for (;;) {
1199        var lineClass = type.match(/(?:^|\s+)line-(background-)?(\S+)/);
1200        if (!lineClass) { break }
1201        type = type.slice(0, lineClass.index) + type.slice(lineClass.index + lineClass[0].length);
1202        var prop = lineClass[1] ? "bgClass" : "textClass";
1203        if (output[prop] == null)
1204          { output[prop] = lineClass[2]; }
1205        else if (!(new RegExp("(?:^|\\s)" + lineClass[2] + "(?:$|\\s)")).test(output[prop]))
1206          { output[prop] += " " + lineClass[2]; }
1207      } }
1208      return type
1209    }
1210  
1211    // Run the given mode's parser over a line, calling f for each token.
1212    function runMode(cm, text, mode, context, f, lineClasses, forceToEnd) {
1213      var flattenSpans = mode.flattenSpans;
1214      if (flattenSpans == null) { flattenSpans = cm.options.flattenSpans; }
1215      var curStart = 0, curStyle = null;
1216      var stream = new StringStream(text, cm.options.tabSize, context), style;
1217      var inner = cm.options.addModeClass && [null];
1218      if (text == "") { extractLineClasses(callBlankLine(mode, context.state), lineClasses); }
1219      while (!stream.eol()) {
1220        if (stream.pos > cm.options.maxHighlightLength) {
1221          flattenSpans = false;
1222          if (forceToEnd) { processLine(cm, text, context, stream.pos); }
1223          stream.pos = text.length;
1224          style = null;
1225        } else {
1226          style = extractLineClasses(readToken(mode, stream, context.state, inner), lineClasses);
1227        }
1228        if (inner) {
1229          var mName = inner[0].name;
1230          if (mName) { style = "m-" + (style ? mName + " " + style : mName); }
1231        }
1232        if (!flattenSpans || curStyle != style) {
1233          while (curStart < stream.start) {
1234            curStart = Math.min(stream.start, curStart + 5000);
1235            f(curStart, curStyle);
1236          }
1237          curStyle = style;
1238        }
1239        stream.start = stream.pos;
1240      }
1241      while (curStart < stream.pos) {
1242        // Webkit seems to refuse to render text nodes longer than 57444
1243        // characters, and returns inaccurate measurements in nodes
1244        // starting around 5000 chars.
1245        var pos = Math.min(stream.pos, curStart + 5000);
1246        f(pos, curStyle);
1247        curStart = pos;
1248      }
1249    }
1250  
1251    // Finds the line to start with when starting a parse. Tries to
1252    // find a line with a stateAfter, so that it can start with a
1253    // valid state. If that fails, it returns the line with the
1254    // smallest indentation, which tends to need the least context to
1255    // parse correctly.
1256    function findStartLine(cm, n, precise) {
1257      var minindent, minline, doc = cm.doc;
1258      var lim = precise ? -1 : n - (cm.doc.mode.innerMode ? 1000 : 100);
1259      for (var search = n; search > lim; --search) {
1260        if (search <= doc.first) { return doc.first }
1261        var line = getLine(doc, search - 1), after = line.stateAfter;
1262        if (after && (!precise || search + (after instanceof SavedContext ? after.lookAhead : 0) <= doc.modeFrontier))
1263          { return search }
1264        var indented = countColumn(line.text, null, cm.options.tabSize);
1265        if (minline == null || minindent > indented) {
1266          minline = search - 1;
1267          minindent = indented;
1268        }
1269      }
1270      return minline
1271    }
1272  
1273    function retreatFrontier(doc, n) {
1274      doc.modeFrontier = Math.min(doc.modeFrontier, n);
1275      if (doc.highlightFrontier < n - 10) { return }
1276      var start = doc.first;
1277      for (var line = n - 1; line > start; line--) {
1278        var saved = getLine(doc, line).stateAfter;
1279        // change is on 3
1280        // state on line 1 looked ahead 2 -- so saw 3
1281        // test 1 + 2 < 3 should cover this
1282        if (saved && (!(saved instanceof SavedContext) || line + saved.lookAhead < n)) {
1283          start = line + 1;
1284          break
1285        }
1286      }
1287      doc.highlightFrontier = Math.min(doc.highlightFrontier, start);
1288    }
1289  
1290    // Optimize some code when these features are not used.
1291    var sawReadOnlySpans = false, sawCollapsedSpans = false;
1292  
1293    function seeReadOnlySpans() {
1294      sawReadOnlySpans = true;
1295    }
1296  
1297    function seeCollapsedSpans() {
1298      sawCollapsedSpans = true;
1299    }
1300  
1301    // TEXTMARKER SPANS
1302  
1303    function MarkedSpan(marker, from, to) {
1304      this.marker = marker;
1305      this.from = from; this.to = to;
1306    }
1307  
1308    // Search an array of spans for a span matching the given marker.
1309    function getMarkedSpanFor(spans, marker) {
1310      if (spans) { for (var i = 0; i < spans.length; ++i) {
1311        var span = spans[i];
1312        if (span.marker == marker) { return span }
1313      } }
1314    }
1315  
1316    // Remove a span from an array, returning undefined if no spans are
1317    // left (we don't store arrays for lines without spans).
1318    function removeMarkedSpan(spans, span) {
1319      var r;
1320      for (var i = 0; i < spans.length; ++i)
1321        { if (spans[i] != span) { (r || (r = [])).push(spans[i]); } }
1322      return r
1323    }
1324  
1325    // Add a span to a line.
1326    function addMarkedSpan(line, span, op) {
1327      var inThisOp = op && window.WeakSet && (op.markedSpans || (op.markedSpans = new WeakSet));
1328      if (inThisOp && line.markedSpans && inThisOp.has(line.markedSpans)) {
1329        line.markedSpans.push(span);
1330      } else {
1331        line.markedSpans = line.markedSpans ? line.markedSpans.concat([span]) : [span];
1332        if (inThisOp) { inThisOp.add(line.markedSpans); }
1333      }
1334      span.marker.attachLine(line);
1335    }
1336  
1337    // Used for the algorithm that adjusts markers for a change in the
1338    // document. These functions cut an array of spans at a given
1339    // character position, returning an array of remaining chunks (or
1340    // undefined if nothing remains).
1341    function markedSpansBefore(old, startCh, isInsert) {
1342      var nw;
1343      if (old) { for (var i = 0; i < old.length; ++i) {
1344        var span = old[i], marker = span.marker;
1345        var startsBefore = span.from == null || (marker.inclusiveLeft ? span.from <= startCh : span.from < startCh);
1346        if (startsBefore || span.from == startCh && marker.type == "bookmark" && (!isInsert || !span.marker.insertLeft)) {
1347          var endsAfter = span.to == null || (marker.inclusiveRight ? span.to >= startCh : span.to > startCh)
1348          ;(nw || (nw = [])).push(new MarkedSpan(marker, span.from, endsAfter ? null : span.to));
1349        }
1350      } }
1351      return nw
1352    }
1353    function markedSpansAfter(old, endCh, isInsert) {
1354      var nw;
1355      if (old) { for (var i = 0; i < old.length; ++i) {
1356        var span = old[i], marker = span.marker;
1357        var endsAfter = span.to == null || (marker.inclusiveRight ? span.to >= endCh : span.to > endCh);
1358        if (endsAfter || span.from == endCh && marker.type == "bookmark" && (!isInsert || span.marker.insertLeft)) {
1359          var startsBefore = span.from == null || (marker.inclusiveLeft ? span.from <= endCh : span.from < endCh)
1360          ;(nw || (nw = [])).push(new MarkedSpan(marker, startsBefore ? null : span.from - endCh,
1361                                                span.to == null ? null : span.to - endCh));
1362        }
1363      } }
1364      return nw
1365    }
1366  
1367    // Given a change object, compute the new set of marker spans that
1368    // cover the line in which the change took place. Removes spans
1369    // entirely within the change, reconnects spans belonging to the
1370    // same marker that appear on both sides of the change, and cuts off
1371    // spans partially within the change. Returns an array of span
1372    // arrays with one element for each line in (after) the change.
1373    function stretchSpansOverChange(doc, change) {
1374      if (change.full) { return null }
1375      var oldFirst = isLine(doc, change.from.line) && getLine(doc, change.from.line).markedSpans;
1376      var oldLast = isLine(doc, change.to.line) && getLine(doc, change.to.line).markedSpans;
1377      if (!oldFirst && !oldLast) { return null }
1378  
1379      var startCh = change.from.ch, endCh = change.to.ch, isInsert = cmp(change.from, change.to) == 0;
1380      // Get the spans that 'stick out' on both sides
1381      var first = markedSpansBefore(oldFirst, startCh, isInsert);
1382      var last = markedSpansAfter(oldLast, endCh, isInsert);
1383  
1384      // Next, merge those two ends
1385      var sameLine = change.text.length == 1, offset = lst(change.text).length + (sameLine ? startCh : 0);
1386      if (first) {
1387        // Fix up .to properties of first
1388        for (var i = 0; i < first.length; ++i) {
1389          var span = first[i];
1390          if (span.to == null) {
1391            var found = getMarkedSpanFor(last, span.marker);
1392            if (!found) { span.to = startCh; }
1393            else if (sameLine) { span.to = found.to == null ? null : found.to + offset; }
1394          }
1395        }
1396      }
1397      if (last) {
1398        // Fix up .from in last (or move them into first in case of sameLine)
1399        for (var i$1 = 0; i$1 < last.length; ++i$1) {
1400          var span$1 = last[i$1];
1401          if (span$1.to != null) { span$1.to += offset; }
1402          if (span$1.from == null) {
1403            var found$1 = getMarkedSpanFor(first, span$1.marker);
1404            if (!found$1) {
1405              span$1.from = offset;
1406              if (sameLine) { (first || (first = [])).push(span$1); }
1407            }
1408          } else {
1409            span$1.from += offset;
1410            if (sameLine) { (first || (first = [])).push(span$1); }
1411          }
1412        }
1413      }
1414      // Make sure we didn't create any zero-length spans
1415      if (first) { first = clearEmptySpans(first); }
1416      if (last && last != first) { last = clearEmptySpans(last); }
1417  
1418      var newMarkers = [first];
1419      if (!sameLine) {
1420        // Fill gap with whole-line-spans
1421        var gap = change.text.length - 2, gapMarkers;
1422        if (gap > 0 && first)
1423          { for (var i$2 = 0; i$2 < first.length; ++i$2)
1424            { if (first[i$2].to == null)
1425              { (gapMarkers || (gapMarkers = [])).push(new MarkedSpan(first[i$2].marker, null, null)); } } }
1426        for (var i$3 = 0; i$3 < gap; ++i$3)
1427          { newMarkers.push(gapMarkers); }
1428        newMarkers.push(last);
1429      }
1430      return newMarkers
1431    }
1432  
1433    // Remove spans that are empty and don't have a clearWhenEmpty
1434    // option of false.
1435    function clearEmptySpans(spans) {
1436      for (var i = 0; i < spans.length; ++i) {
1437        var span = spans[i];
1438        if (span.from != null && span.from == span.to && span.marker.clearWhenEmpty !== false)
1439          { spans.splice(i--, 1); }
1440      }
1441      if (!spans.length) { return null }
1442      return spans
1443    }
1444  
1445    // Used to 'clip' out readOnly ranges when making a change.
1446    function removeReadOnlyRanges(doc, from, to) {
1447      var markers = null;
1448      doc.iter(from.line, to.line + 1, function (line) {
1449        if (line.markedSpans) { for (var i = 0; i < line.markedSpans.length; ++i) {
1450          var mark = line.markedSpans[i].marker;
1451          if (mark.readOnly && (!markers || indexOf(markers, mark) == -1))
1452            { (markers || (markers = [])).push(mark); }
1453        } }
1454      });
1455      if (!markers) { return null }
1456      var parts = [{from: from, to: to}];
1457      for (var i = 0; i < markers.length; ++i) {
1458        var mk = markers[i], m = mk.find(0);
1459        for (var j = 0; j < parts.length; ++j) {
1460          var p = parts[j];
1461          if (cmp(p.to, m.from) < 0 || cmp(p.from, m.to) > 0) { continue }
1462          var newParts = [j, 1], dfrom = cmp(p.from, m.from), dto = cmp(p.to, m.to);
1463          if (dfrom < 0 || !mk.inclusiveLeft && !dfrom)
1464            { newParts.push({from: p.from, to: m.from}); }
1465          if (dto > 0 || !mk.inclusiveRight && !dto)
1466            { newParts.push({from: m.to, to: p.to}); }
1467          parts.splice.apply(parts, newParts);
1468          j += newParts.length - 3;
1469        }
1470      }
1471      return parts
1472    }
1473  
1474    // Connect or disconnect spans from a line.
1475    function detachMarkedSpans(line) {
1476      var spans = line.markedSpans;
1477      if (!spans) { return }
1478      for (var i = 0; i < spans.length; ++i)
1479        { spans[i].marker.detachLine(line); }
1480      line.markedSpans = null;
1481    }
1482    function attachMarkedSpans(line, spans) {
1483      if (!spans) { return }
1484      for (var i = 0; i < spans.length; ++i)
1485        { spans[i].marker.attachLine(line); }
1486      line.markedSpans = spans;
1487    }
1488  
1489    // Helpers used when computing which overlapping collapsed span
1490    // counts as the larger one.
1491    function extraLeft(marker) { return marker.inclusiveLeft ? -1 : 0 }
1492    function extraRight(marker) { return marker.inclusiveRight ? 1 : 0 }
1493  
1494    // Returns a number indicating which of two overlapping collapsed
1495    // spans is larger (and thus includes the other). Falls back to
1496    // comparing ids when the spans cover exactly the same range.
1497    function compareCollapsedMarkers(a, b) {
1498      var lenDiff = a.lines.length - b.lines.length;
1499      if (lenDiff != 0) { return lenDiff }
1500      var aPos = a.find(), bPos = b.find();
1501      var fromCmp = cmp(aPos.from, bPos.from) || extraLeft(a) - extraLeft(b);
1502      if (fromCmp) { return -fromCmp }
1503      var toCmp = cmp(aPos.to, bPos.to) || extraRight(a) - extraRight(b);
1504      if (toCmp) { return toCmp }
1505      return b.id - a.id
1506    }
1507  
1508    // Find out whether a line ends or starts in a collapsed span. If
1509    // so, return the marker for that span.
1510    function collapsedSpanAtSide(line, start) {
1511      var sps = sawCollapsedSpans && line.markedSpans, found;
1512      if (sps) { for (var sp = (void 0), i = 0; i < sps.length; ++i) {
1513        sp = sps[i];
1514        if (sp.marker.collapsed && (start ? sp.from : sp.to) == null &&
1515            (!found || compareCollapsedMarkers(found, sp.marker) < 0))
1516          { found = sp.marker; }
1517      } }
1518      return found
1519    }
1520    function collapsedSpanAtStart(line) { return collapsedSpanAtSide(line, true) }
1521    function collapsedSpanAtEnd(line) { return collapsedSpanAtSide(line, false) }
1522  
1523    function collapsedSpanAround(line, ch) {
1524      var sps = sawCollapsedSpans && line.markedSpans, found;
1525      if (sps) { for (var i = 0; i < sps.length; ++i) {
1526        var sp = sps[i];
1527        if (sp.marker.collapsed && (sp.from == null || sp.from < ch) && (sp.to == null || sp.to > ch) &&
1528            (!found || compareCollapsedMarkers(found, sp.marker) < 0)) { found = sp.marker; }
1529      } }
1530      return found
1531    }
1532  
1533    // Test whether there exists a collapsed span that partially
1534    // overlaps (covers the start or end, but not both) of a new span.
1535    // Such overlap is not allowed.
1536    function conflictingCollapsedRange(doc, lineNo, from, to, marker) {
1537      var line = getLine(doc, lineNo);
1538      var sps = sawCollapsedSpans && line.markedSpans;
1539      if (sps) { for (var i = 0; i < sps.length; ++i) {
1540        var sp = sps[i];
1541        if (!sp.marker.collapsed) { continue }
1542        var found = sp.marker.find(0);
1543        var fromCmp = cmp(found.from, from) || extraLeft(sp.marker) - extraLeft(marker);
1544        var toCmp = cmp(found.to, to) || extraRight(sp.marker) - extraRight(marker);
1545        if (fromCmp >= 0 && toCmp <= 0 || fromCmp <= 0 && toCmp >= 0) { continue }
1546        if (fromCmp <= 0 && (sp.marker.inclusiveRight && marker.inclusiveLeft ? cmp(found.to, from) >= 0 : cmp(found.to, from) > 0) ||
1547            fromCmp >= 0 && (sp.marker.inclusiveRight && marker.inclusiveLeft ? cmp(found.from, to) <= 0 : cmp(found.from, to) < 0))
1548          { return true }
1549      } }
1550    }
1551  
1552    // A visual line is a line as drawn on the screen. Folding, for
1553    // example, can cause multiple logical lines to appear on the same
1554    // visual line. This finds the start of the visual line that the
1555    // given line is part of (usually that is the line itself).
1556    function visualLine(line) {
1557      var merged;
1558      while (merged = collapsedSpanAtStart(line))
1559        { line = merged.find(-1, true).line; }
1560      return line
1561    }
1562  
1563    function visualLineEnd(line) {
1564      var merged;
1565      while (merged = collapsedSpanAtEnd(line))
1566        { line = merged.find(1, true).line; }
1567      return line
1568    }
1569  
1570    // Returns an array of logical lines that continue the visual line
1571    // started by the argument, or undefined if there are no such lines.
1572    function visualLineContinued(line) {
1573      var merged, lines;
1574      while (merged = collapsedSpanAtEnd(line)) {
1575        line = merged.find(1, true).line
1576        ;(lines || (lines = [])).push(line);
1577      }
1578      return lines
1579    }
1580  
1581    // Get the line number of the start of the visual line that the
1582    // given line number is part of.
1583    function visualLineNo(doc, lineN) {
1584      var line = getLine(doc, lineN), vis = visualLine(line);
1585      if (line == vis) { return lineN }
1586      return lineNo(vis)
1587    }
1588  
1589    // Get the line number of the start of the next visual line after
1590    // the given line.
1591    function visualLineEndNo(doc, lineN) {
1592      if (lineN > doc.lastLine()) { return lineN }
1593      var line = getLine(doc, lineN), merged;
1594      if (!lineIsHidden(doc, line)) { return lineN }
1595      while (merged = collapsedSpanAtEnd(line))
1596        { line = merged.find(1, true).line; }
1597      return lineNo(line) + 1
1598    }
1599  
1600    // Compute whether a line is hidden. Lines count as hidden when they
1601    // are part of a visual line that starts with another line, or when
1602    // they are entirely covered by collapsed, non-widget span.
1603    function lineIsHidden(doc, line) {
1604      var sps = sawCollapsedSpans && line.markedSpans;
1605      if (sps) { for (var sp = (void 0), i = 0; i < sps.length; ++i) {
1606        sp = sps[i];
1607        if (!sp.marker.collapsed) { continue }
1608        if (sp.from == null) { return true }
1609        if (sp.marker.widgetNode) { continue }
1610        if (sp.from == 0 && sp.marker.inclusiveLeft && lineIsHiddenInner(doc, line, sp))
1611          { return true }
1612      } }
1613    }
1614    function lineIsHiddenInner(doc, line, span) {
1615      if (span.to == null) {
1616        var end = span.marker.find(1, true);
1617        return lineIsHiddenInner(doc, end.line, getMarkedSpanFor(end.line.markedSpans, span.marker))
1618      }
1619      if (span.marker.inclusiveRight && span.to == line.text.length)
1620        { return true }
1621      for (var sp = (void 0), i = 0; i < line.markedSpans.length; ++i) {
1622        sp = line.markedSpans[i];
1623        if (sp.marker.collapsed && !sp.marker.widgetNode && sp.from == span.to &&
1624            (sp.to == null || sp.to != span.from) &&
1625            (sp.marker.inclusiveLeft || span.marker.inclusiveRight) &&
1626            lineIsHiddenInner(doc, line, sp)) { return true }
1627      }
1628    }
1629  
1630    // Find the height above the given line.
1631    function heightAtLine(lineObj) {
1632      lineObj = visualLine(lineObj);
1633  
1634      var h = 0, chunk = lineObj.parent;
1635      for (var i = 0; i < chunk.lines.length; ++i) {
1636        var line = chunk.lines[i];
1637        if (line == lineObj) { break }
1638        else { h += line.height; }
1639      }
1640      for (var p = chunk.parent; p; chunk = p, p = chunk.parent) {
1641        for (var i$1 = 0; i$1 < p.children.length; ++i$1) {
1642          var cur = p.children[i$1];
1643          if (cur == chunk) { break }
1644          else { h += cur.height; }
1645        }
1646      }
1647      return h
1648    }
1649  
1650    // Compute the character length of a line, taking into account
1651    // collapsed ranges (see markText) that might hide parts, and join
1652    // other lines onto it.
1653    function lineLength(line) {
1654      if (line.height == 0) { return 0 }
1655      var len = line.text.length, merged, cur = line;
1656      while (merged = collapsedSpanAtStart(cur)) {
1657        var found = merged.find(0, true);
1658        cur = found.from.line;
1659        len += found.from.ch - found.to.ch;
1660      }
1661      cur = line;
1662      while (merged = collapsedSpanAtEnd(cur)) {
1663        var found$1 = merged.find(0, true);
1664        len -= cur.text.length - found$1.from.ch;
1665        cur = found$1.to.line;
1666        len += cur.text.length - found$1.to.ch;
1667      }
1668      return len
1669    }
1670  
1671    // Find the longest line in the document.
1672    function findMaxLine(cm) {
1673      var d = cm.display, doc = cm.doc;
1674      d.maxLine = getLine(doc, doc.first);
1675      d.maxLineLength = lineLength(d.maxLine);
1676      d.maxLineChanged = true;
1677      doc.iter(function (line) {
1678        var len = lineLength(line);
1679        if (len > d.maxLineLength) {
1680          d.maxLineLength = len;
1681          d.maxLine = line;
1682        }
1683      });
1684    }
1685  
1686    // LINE DATA STRUCTURE
1687  
1688    // Line objects. These hold state related to a line, including
1689    // highlighting info (the styles array).
1690    var Line = function(text, markedSpans, estimateHeight) {
1691      this.text = text;
1692      attachMarkedSpans(this, markedSpans);
1693      this.height = estimateHeight ? estimateHeight(this) : 1;
1694    };
1695  
1696    Line.prototype.lineNo = function () { return lineNo(this) };
1697    eventMixin(Line);
1698  
1699    // Change the content (text, markers) of a line. Automatically
1700    // invalidates cached information and tries to re-estimate the
1701    // line's height.
1702    function updateLine(line, text, markedSpans, estimateHeight) {
1703      line.text = text;
1704      if (line.stateAfter) { line.stateAfter = null; }
1705      if (line.styles) { line.styles = null; }
1706      if (line.order != null) { line.order = null; }
1707      detachMarkedSpans(line);
1708      attachMarkedSpans(line, markedSpans);
1709      var estHeight = estimateHeight ? estimateHeight(line) : 1;
1710      if (estHeight != line.height) { updateLineHeight(line, estHeight); }
1711    }
1712  
1713    // Detach a line from the document tree and its markers.
1714    function cleanUpLine(line) {
1715      line.parent = null;
1716      detachMarkedSpans(line);
1717    }
1718  
1719    // Convert a style as returned by a mode (either null, or a string
1720    // containing one or more styles) to a CSS style. This is cached,
1721    // and also looks for line-wide styles.
1722    var styleToClassCache = {}, styleToClassCacheWithMode = {};
1723    function interpretTokenStyle(style, options) {
1724      if (!style || /^\s*$/.test(style)) { return null }
1725      var cache = options.addModeClass ? styleToClassCacheWithMode : styleToClassCache;
1726      return cache[style] ||
1727        (cache[style] = style.replace(/\S+/g, "cm-$&"))
1728    }
1729  
1730    // Render the DOM representation of the text of a line. Also builds
1731    // up a 'line map', which points at the DOM nodes that represent
1732    // specific stretches of text, and is used by the measuring code.
1733    // The returned object contains the DOM node, this map, and
1734    // information about line-wide styles that were set by the mode.
1735    function buildLineContent(cm, lineView) {
1736      // The padding-right forces the element to have a 'border', which
1737      // is needed on Webkit to be able to get line-level bounding
1738      // rectangles for it (in measureChar).
1739      var content = eltP("span", null, null, webkit ? "padding-right: .1px" : null);
1740      var builder = {pre: eltP("pre", [content], "CodeMirror-line"), content: content,
1741                     col: 0, pos: 0, cm: cm,
1742                     trailingSpace: false,
1743                     splitSpaces: cm.getOption("lineWrapping")};
1744      lineView.measure = {};
1745  
1746      // Iterate over the logical lines that make up this visual line.
1747      for (var i = 0; i <= (lineView.rest ? lineView.rest.length : 0); i++) {
1748        var line = i ? lineView.rest[i - 1] : lineView.line, order = (void 0);
1749        builder.pos = 0;
1750        builder.addToken = buildToken;
1751        // Optionally wire in some hacks into the token-rendering
1752        // algorithm, to deal with browser quirks.
1753        if (hasBadBidiRects(cm.display.measure) && (order = getOrder(line, cm.doc.direction)))
1754          { builder.addToken = buildTokenBadBidi(builder.addToken, order); }
1755        builder.map = [];
1756        var allowFrontierUpdate = lineView != cm.display.externalMeasured && lineNo(line);
1757        insertLineContent(line, builder, getLineStyles(cm, line, allowFrontierUpdate));
1758        if (line.styleClasses) {
1759          if (line.styleClasses.bgClass)
1760            { builder.bgClass = joinClasses(line.styleClasses.bgClass, builder.bgClass || ""); }
1761          if (line.styleClasses.textClass)
1762            { builder.textClass = joinClasses(line.styleClasses.textClass, builder.textClass || ""); }
1763        }
1764  
1765        // Ensure at least a single node is present, for measuring.
1766        if (builder.map.length == 0)
1767          { builder.map.push(0, 0, builder.content.appendChild(zeroWidthElement(cm.display.measure))); }
1768  
1769        // Store the map and a cache object for the current logical line
1770        if (i == 0) {
1771          lineView.measure.map = builder.map;
1772          lineView.measure.cache = {};
1773        } else {
1774    (lineView.measure.maps || (lineView.measure.maps = [])).push(builder.map)
1775          ;(lineView.measure.caches || (lineView.measure.caches = [])).push({});
1776        }
1777      }
1778  
1779      // See issue #2901
1780      if (webkit) {
1781        var last = builder.content.lastChild;
1782        if (/\bcm-tab\b/.test(last.className) || (last.querySelector && last.querySelector(".cm-tab")))
1783          { builder.content.className = "cm-tab-wrap-hack"; }
1784      }
1785  
1786      signal(cm, "renderLine", cm, lineView.line, builder.pre);
1787      if (builder.pre.className)
1788        { builder.textClass = joinClasses(builder.pre.className, builder.textClass || ""); }
1789  
1790      return builder
1791    }
1792  
1793    function defaultSpecialCharPlaceholder(ch) {
1794      var token = elt("span", "\u2022", "cm-invalidchar");
1795      token.title = "\\u" + ch.charCodeAt(0).toString(16);
1796      token.setAttribute("aria-label", token.title);
1797      return token
1798    }
1799  
1800    // Build up the DOM representation for a single token, and add it to
1801    // the line map. Takes care to render special characters separately.
1802    function buildToken(builder, text, style, startStyle, endStyle, css, attributes) {
1803      if (!text) { return }
1804      var displayText = builder.splitSpaces ? splitSpaces(text, builder.trailingSpace) : text;
1805      var special = builder.cm.state.specialChars, mustWrap = false;
1806      var content;
1807      if (!special.test(text)) {
1808        builder.col += text.length;
1809        content = document.createTextNode(displayText);
1810        builder.map.push(builder.pos, builder.pos + text.length, content);
1811        if (ie && ie_version < 9) { mustWrap = true; }
1812        builder.pos += text.length;
1813      } else {
1814        content = document.createDocumentFragment();
1815        var pos = 0;
1816        while (true) {
1817          special.lastIndex = pos;
1818          var m = special.exec(text);
1819          var skipped = m ? m.index - pos : text.length - pos;
1820          if (skipped) {
1821            var txt = document.createTextNode(displayText.slice(pos, pos + skipped));
1822            if (ie && ie_version < 9) { content.appendChild(elt("span", [txt])); }
1823            else { content.appendChild(txt); }
1824            builder.map.push(builder.pos, builder.pos + skipped, txt);
1825            builder.col += skipped;
1826            builder.pos += skipped;
1827          }
1828          if (!m) { break }
1829          pos += skipped + 1;
1830          var txt$1 = (void 0);
1831          if (m[0] == "\t") {
1832            var tabSize = builder.cm.options.tabSize, tabWidth = tabSize - builder.col % tabSize;
1833            txt$1 = content.appendChild(elt("span", spaceStr(tabWidth), "cm-tab"));
1834            txt$1.setAttribute("role", "presentation");
1835            txt$1.setAttribute("cm-text", "\t");
1836            builder.col += tabWidth;
1837          } else if (m[0] == "\r" || m[0] == "\n") {
1838            txt$1 = content.appendChild(elt("span", m[0] == "\r" ? "\u240d" : "\u2424", "cm-invalidchar"));
1839            txt$1.setAttribute("cm-text", m[0]);
1840            builder.col += 1;
1841          } else {
1842            txt$1 = builder.cm.options.specialCharPlaceholder(m[0]);
1843            txt$1.setAttribute("cm-text", m[0]);
1844            if (ie && ie_version < 9) { content.appendChild(elt("span", [txt$1])); }
1845            else { content.appendChild(txt$1); }
1846            builder.col += 1;
1847          }
1848          builder.map.push(builder.pos, builder.pos + 1, txt$1);
1849          builder.pos++;
1850        }
1851      }
1852      builder.trailingSpace = displayText.charCodeAt(text.length - 1) == 32;
1853      if (style || startStyle || endStyle || mustWrap || css || attributes) {
1854        var fullStyle = style || "";
1855        if (startStyle) { fullStyle += startStyle; }
1856        if (endStyle) { fullStyle += endStyle; }
1857        var token = elt("span", [content], fullStyle, css);
1858        if (attributes) {
1859          for (var attr in attributes) { if (attributes.hasOwnProperty(attr) && attr != "style" && attr != "class")
1860            { token.setAttribute(attr, attributes[attr]); } }
1861        }
1862        return builder.content.appendChild(token)
1863      }
1864      builder.content.appendChild(content);
1865    }
1866  
1867    // Change some spaces to NBSP to prevent the browser from collapsing
1868    // trailing spaces at the end of a line when rendering text (issue #1362).
1869    function splitSpaces(text, trailingBefore) {
1870      if (text.length > 1 && !/  /.test(text)) { return text }
1871      var spaceBefore = trailingBefore, result = "";
1872      for (var i = 0; i < text.length; i++) {
1873        var ch = text.charAt(i);
1874        if (ch == " " && spaceBefore && (i == text.length - 1 || text.charCodeAt(i + 1) == 32))
1875          { ch = "\u00a0"; }
1876        result += ch;
1877        spaceBefore = ch == " ";
1878      }
1879      return result
1880    }
1881  
1882    // Work around nonsense dimensions being reported for stretches of
1883    // right-to-left text.
1884    function buildTokenBadBidi(inner, order) {
1885      return function (builder, text, style, startStyle, endStyle, css, attributes) {
1886        style = style ? style + " cm-force-border" : "cm-force-border";
1887        var start = builder.pos, end = start + text.length;
1888        for (;;) {
1889          // Find the part that overlaps with the start of this text
1890          var part = (void 0);
1891          for (var i = 0; i < order.length; i++) {
1892            part = order[i];
1893            if (part.to > start && part.from <= start) { break }
1894          }
1895          if (part.to >= end) { return inner(builder, text, style, startStyle, endStyle, css, attributes) }
1896          inner(builder, text.slice(0, part.to - start), style, startStyle, null, css, attributes);
1897          startStyle = null;
1898          text = text.slice(part.to - start);
1899          start = part.to;
1900        }
1901      }
1902    }
1903  
1904    function buildCollapsedSpan(builder, size, marker, ignoreWidget) {
1905      var widget = !ignoreWidget && marker.widgetNode;
1906      if (widget) { builder.map.push(builder.pos, builder.pos + size, widget); }
1907      if (!ignoreWidget && builder.cm.display.input.needsContentAttribute) {
1908        if (!widget)
1909          { widget = builder.content.appendChild(document.createElement("span")); }
1910        widget.setAttribute("cm-marker", marker.id);
1911      }
1912      if (widget) {
1913        builder.cm.display.input.setUneditable(widget);
1914        builder.content.appendChild(widget);
1915      }
1916      builder.pos += size;
1917      builder.trailingSpace = false;
1918    }
1919  
1920    // Outputs a number of spans to make up a line, taking highlighting
1921    // and marked text into account.
1922    function insertLineContent(line, builder, styles) {
1923      var spans = line.markedSpans, allText = line.text, at = 0;
1924      if (!spans) {
1925        for (var i$1 = 1; i$1 < styles.length; i$1+=2)
1926          { builder.addToken(builder, allText.slice(at, at = styles[i$1]), interpretTokenStyle(styles[i$1+1], builder.cm.options)); }
1927        return
1928      }
1929  
1930      var len = allText.length, pos = 0, i = 1, text = "", style, css;
1931      var nextChange = 0, spanStyle, spanEndStyle, spanStartStyle, collapsed, attributes;
1932      for (;;) {
1933        if (nextChange == pos) { // Update current marker set
1934          spanStyle = spanEndStyle = spanStartStyle = css = "";
1935          attributes = null;
1936          collapsed = null; nextChange = Infinity;
1937          var foundBookmarks = [], endStyles = (void 0);
1938          for (var j = 0; j < spans.length; ++j) {
1939            var sp = spans[j], m = sp.marker;
1940            if (m.type == "bookmark" && sp.from == pos && m.widgetNode) {
1941              foundBookmarks.push(m);
1942            } else if (sp.from <= pos && (sp.to == null || sp.to > pos || m.collapsed && sp.to == pos && sp.from == pos)) {
1943              if (sp.to != null && sp.to != pos && nextChange > sp.to) {
1944                nextChange = sp.to;
1945                spanEndStyle = "";
1946              }
1947              if (m.className) { spanStyle += " " + m.className; }
1948              if (m.css) { css = (css ? css + ";" : "") + m.css; }
1949              if (m.startStyle && sp.from == pos) { spanStartStyle += " " + m.startStyle; }
1950              if (m.endStyle && sp.to == nextChange) { (endStyles || (endStyles = [])).push(m.endStyle, sp.to); }
1951              // support for the old title property
1952              // https://github.com/codemirror/CodeMirror/pull/5673
1953              if (m.title) { (attributes || (attributes = {})).title = m.title; }
1954              if (m.attributes) {
1955                for (var attr in m.attributes)
1956                  { (attributes || (attributes = {}))[attr] = m.attributes[attr]; }
1957              }
1958              if (m.collapsed && (!collapsed || compareCollapsedMarkers(collapsed.marker, m) < 0))
1959                { collapsed = sp; }
1960            } else if (sp.from > pos && nextChange > sp.from) {
1961              nextChange = sp.from;
1962            }
1963          }
1964          if (endStyles) { for (var j$1 = 0; j$1 < endStyles.length; j$1 += 2)
1965            { if (endStyles[j$1 + 1] == nextChange) { spanEndStyle += " " + endStyles[j$1]; } } }
1966  
1967          if (!collapsed || collapsed.from == pos) { for (var j$2 = 0; j$2 < foundBookmarks.length; ++j$2)
1968            { buildCollapsedSpan(builder, 0, foundBookmarks[j$2]); } }
1969          if (collapsed && (collapsed.from || 0) == pos) {
1970            buildCollapsedSpan(builder, (collapsed.to == null ? len + 1 : collapsed.to) - pos,
1971                               collapsed.marker, collapsed.from == null);
1972            if (collapsed.to == null) { return }
1973            if (collapsed.to == pos) { collapsed = false; }
1974          }
1975        }
1976        if (pos >= len) { break }
1977  
1978        var upto = Math.min(len, nextChange);
1979        while (true) {
1980          if (text) {
1981            var end = pos + text.length;
1982            if (!collapsed) {
1983              var tokenText = end > upto ? text.slice(0, upto - pos) : text;
1984              builder.addToken(builder, tokenText, style ? style + spanStyle : spanStyle,
1985                               spanStartStyle, pos + tokenText.length == nextChange ? spanEndStyle : "", css, attributes);
1986            }
1987            if (end >= upto) {text = text.slice(upto - pos); pos = upto; break}
1988            pos = end;
1989            spanStartStyle = "";
1990          }
1991          text = allText.slice(at, at = styles[i++]);
1992          style = interpretTokenStyle(styles[i++], builder.cm.options);
1993        }
1994      }
1995    }
1996  
1997  
1998    // These objects are used to represent the visible (currently drawn)
1999    // part of the document. A LineView may correspond to multiple
2000    // logical lines, if those are connected by collapsed ranges.
2001    function LineView(doc, line, lineN) {
2002      // The starting line
2003      this.line = line;
2004      // Continuing lines, if any
2005      this.rest = visualLineContinued(line);
2006      // Number of logical lines in this visual line
2007      this.size = this.rest ? lineNo(lst(this.rest)) - lineN + 1 : 1;
2008      this.node = this.text = null;
2009      this.hidden = lineIsHidden(doc, line);
2010    }
2011  
2012    // Create a range of LineView objects for the given lines.
2013    function buildViewArray(cm, from, to) {
2014      var array = [], nextPos;
2015      for (var pos = from; pos < to; pos = nextPos) {
2016        var view = new LineView(cm.doc, getLine(cm.doc, pos), pos);
2017        nextPos = pos + view.size;
2018        array.push(view);
2019      }
2020      return array
2021    }
2022  
2023    var operationGroup = null;
2024  
2025    function pushOperation(op) {
2026      if (operationGroup) {
2027        operationGroup.ops.push(op);
2028      } else {
2029        op.ownsGroup = operationGroup = {
2030          ops: [op],
2031          delayedCallbacks: []
2032        };
2033      }
2034    }
2035  
2036    function fireCallbacksForOps(group) {
2037      // Calls delayed callbacks and cursorActivity handlers until no
2038      // new ones appear
2039      var callbacks = group.delayedCallbacks, i = 0;
2040      do {
2041        for (; i < callbacks.length; i++)
2042          { callbacks[i].call(null); }
2043        for (var j = 0; j < group.ops.length; j++) {
2044          var op = group.ops[j];
2045          if (op.cursorActivityHandlers)
2046            { while (op.cursorActivityCalled < op.cursorActivityHandlers.length)
2047              { op.cursorActivityHandlers[op.cursorActivityCalled++].call(null, op.cm); } }
2048        }
2049      } while (i < callbacks.length)
2050    }
2051  
2052    function finishOperation(op, endCb) {
2053      var group = op.ownsGroup;
2054      if (!group) { return }
2055  
2056      try { fireCallbacksForOps(group); }
2057      finally {
2058        operationGroup = null;
2059        endCb(group);
2060      }
2061    }
2062  
2063    var orphanDelayedCallbacks = null;
2064  
2065    // Often, we want to signal events at a point where we are in the
2066    // middle of some work, but don't want the handler to start calling
2067    // other methods on the editor, which might be in an inconsistent
2068    // state or simply not expect any other events to happen.
2069    // signalLater looks whether there are any handlers, and schedules
2070    // them to be executed when the last operation ends, or, if no
2071    // operation is active, when a timeout fires.
2072    function signalLater(emitter, type /*, values...*/) {
2073      var arr = getHandlers(emitter, type);
2074      if (!arr.length) { return }
2075      var args = Array.prototype.slice.call(arguments, 2), list;
2076      if (operationGroup) {
2077        list = operationGroup.delayedCallbacks;
2078      } else if (orphanDelayedCallbacks) {
2079        list = orphanDelayedCallbacks;
2080      } else {
2081        list = orphanDelayedCallbacks = [];
2082        setTimeout(fireOrphanDelayed, 0);
2083      }
2084      var loop = function ( i ) {
2085        list.push(function () { return arr[i].apply(null, args); });
2086      };
2087  
2088      for (var i = 0; i < arr.length; ++i)
2089        loop( i );
2090    }
2091  
2092    function fireOrphanDelayed() {
2093      var delayed = orphanDelayedCallbacks;
2094      orphanDelayedCallbacks = null;
2095      for (var i = 0; i < delayed.length; ++i) { delayed[i](); }
2096    }
2097  
2098    // When an aspect of a line changes, a string is added to
2099    // lineView.changes. This updates the relevant part of the line's
2100    // DOM structure.
2101    function updateLineForChanges(cm, lineView, lineN, dims) {
2102      for (var j = 0; j < lineView.changes.length; j++) {
2103        var type = lineView.changes[j];
2104        if (type == "text") { updateLineText(cm, lineView); }
2105        else if (type == "gutter") { updateLineGutter(cm, lineView, lineN, dims); }
2106        else if (type == "class") { updateLineClasses(cm, lineView); }
2107        else if (type == "widget") { updateLineWidgets(cm, lineView, dims); }
2108      }
2109      lineView.changes = null;
2110    }
2111  
2112    // Lines with gutter elements, widgets or a background class need to
2113    // be wrapped, and have the extra elements added to the wrapper div
2114    function ensureLineWrapped(lineView) {
2115      if (lineView.node == lineView.text) {
2116        lineView.node = elt("div", null, null, "position: relative");
2117        if (lineView.text.parentNode)
2118          { lineView.text.parentNode.replaceChild(lineView.node, lineView.text); }
2119        lineView.node.appendChild(lineView.text);
2120        if (ie && ie_version < 8) { lineView.node.style.zIndex = 2; }
2121      }
2122      return lineView.node
2123    }
2124  
2125    function updateLineBackground(cm, lineView) {
2126      var cls = lineView.bgClass ? lineView.bgClass + " " + (lineView.line.bgClass || "") : lineView.line.bgClass;
2127      if (cls) { cls += " CodeMirror-linebackground"; }
2128      if (lineView.background) {
2129        if (cls) { lineView.background.className = cls; }
2130        else { lineView.background.parentNode.removeChild(lineView.background); lineView.background = null; }
2131      } else if (cls) {
2132        var wrap = ensureLineWrapped(lineView);
2133        lineView.background = wrap.insertBefore(elt("div", null, cls), wrap.firstChild);
2134        cm.display.input.setUneditable(lineView.background);
2135      }
2136    }
2137  
2138    // Wrapper around buildLineContent which will reuse the structure
2139    // in display.externalMeasured when possible.
2140    function getLineContent(cm, lineView) {
2141      var ext = cm.display.externalMeasured;
2142      if (ext && ext.line == lineView.line) {
2143        cm.display.externalMeasured = null;
2144        lineView.measure = ext.measure;
2145        return ext.built
2146      }
2147      return buildLineContent(cm, lineView)
2148    }
2149  
2150    // Redraw the line's text. Interacts with the background and text
2151    // classes because the mode may output tokens that influence these
2152    // classes.
2153    function updateLineText(cm, lineView) {
2154      var cls = lineView.text.className;
2155      var built = getLineContent(cm, lineView);
2156      if (lineView.text == lineView.node) { lineView.node = built.pre; }
2157      lineView.text.parentNode.replaceChild(built.pre, lineView.text);
2158      lineView.text = built.pre;
2159      if (built.bgClass != lineView.bgClass || built.textClass != lineView.textClass) {
2160        lineView.bgClass = built.bgClass;
2161        lineView.textClass = built.textClass;
2162        updateLineClasses(cm, lineView);
2163      } else if (cls) {
2164        lineView.text.className = cls;
2165      }
2166    }
2167  
2168    function updateLineClasses(cm, lineView) {
2169      updateLineBackground(cm, lineView);
2170      if (lineView.line.wrapClass)
2171        { ensureLineWrapped(lineView).className = lineView.line.wrapClass; }
2172      else if (lineView.node != lineView.text)
2173        { lineView.node.className = ""; }
2174      var textClass = lineView.textClass ? lineView.textClass + " " + (lineView.line.textClass || "") : lineView.line.textClass;
2175      lineView.text.className = textClass || "";
2176    }
2177  
2178    function updateLineGutter(cm, lineView, lineN, dims) {
2179      if (lineView.gutter) {
2180        lineView.node.removeChild(lineView.gutter);
2181        lineView.gutter = null;
2182      }
2183      if (lineView.gutterBackground) {
2184        lineView.node.removeChild(lineView.gutterBackground);
2185        lineView.gutterBackground = null;
2186      }
2187      if (lineView.line.gutterClass) {
2188        var wrap = ensureLineWrapped(lineView);
2189        lineView.gutterBackground = elt("div", null, "CodeMirror-gutter-background " + lineView.line.gutterClass,
2190                                        ("left: " + (cm.options.fixedGutter ? dims.fixedPos : -dims.gutterTotalWidth) + "px; width: " + (dims.gutterTotalWidth) + "px"));
2191        cm.display.input.setUneditable(lineView.gutterBackground);
2192        wrap.insertBefore(lineView.gutterBackground, lineView.text);
2193      }
2194      var markers = lineView.line.gutterMarkers;
2195      if (cm.options.lineNumbers || markers) {
2196        var wrap$1 = ensureLineWrapped(lineView);
2197        var gutterWrap = lineView.gutter = elt("div", null, "CodeMirror-gutter-wrapper", ("left: " + (cm.options.fixedGutter ? dims.fixedPos : -dims.gutterTotalWidth) + "px"));
2198        gutterWrap.setAttribute("aria-hidden", "true");
2199        cm.display.input.setUneditable(gutterWrap);
2200        wrap$1.insertBefore(gutterWrap, lineView.text);
2201        if (lineView.line.gutterClass)
2202          { gutterWrap.className += " " + lineView.line.gutterClass; }
2203        if (cm.options.lineNumbers && (!markers || !markers["CodeMirror-linenumbers"]))
2204          { lineView.lineNumber = gutterWrap.appendChild(
2205            elt("div", lineNumberFor(cm.options, lineN),
2206                "CodeMirror-linenumber CodeMirror-gutter-elt",
2207                ("left: " + (dims.gutterLeft["CodeMirror-linenumbers"]) + "px; width: " + (cm.display.lineNumInnerWidth) + "px"))); }
2208        if (markers) { for (var k = 0; k < cm.display.gutterSpecs.length; ++k) {
2209          var id = cm.display.gutterSpecs[k].className, found = markers.hasOwnProperty(id) && markers[id];
2210          if (found)
2211            { gutterWrap.appendChild(elt("div", [found], "CodeMirror-gutter-elt",
2212                                       ("left: " + (dims.gutterLeft[id]) + "px; width: " + (dims.gutterWidth[id]) + "px"))); }
2213        } }
2214      }
2215    }
2216  
2217    function updateLineWidgets(cm, lineView, dims) {
2218      if (lineView.alignable) { lineView.alignable = null; }
2219      var isWidget = classTest("CodeMirror-linewidget");
2220      for (var node = lineView.node.firstChild, next = (void 0); node; node = next) {
2221        next = node.nextSibling;
2222        if (isWidget.test(node.className)) { lineView.node.removeChild(node); }
2223      }
2224      insertLineWidgets(cm, lineView, dims);
2225    }
2226  
2227    // Build a line's DOM representation from scratch
2228    function buildLineElement(cm, lineView, lineN, dims) {
2229      var built = getLineContent(cm, lineView);
2230      lineView.text = lineView.node = built.pre;
2231      if (built.bgClass) { lineView.bgClass = built.bgClass; }
2232      if (built.textClass) { lineView.textClass = built.textClass; }
2233  
2234      updateLineClasses(cm, lineView);
2235      updateLineGutter(cm, lineView, lineN, dims);
2236      insertLineWidgets(cm, lineView, dims);
2237      return lineView.node
2238    }
2239  
2240    // A lineView may contain multiple logical lines (when merged by
2241    // collapsed spans). The widgets for all of them need to be drawn.
2242    function insertLineWidgets(cm, lineView, dims) {
2243      insertLineWidgetsFor(cm, lineView.line, lineView, dims, true);
2244      if (lineView.rest) { for (var i = 0; i < lineView.rest.length; i++)
2245        { insertLineWidgetsFor(cm, lineView.rest[i], lineView, dims, false); } }
2246    }
2247  
2248    function insertLineWidgetsFor(cm, line, lineView, dims, allowAbove) {
2249      if (!line.widgets) { return }
2250      var wrap = ensureLineWrapped(lineView);
2251      for (var i = 0, ws = line.widgets; i < ws.length; ++i) {
2252        var widget = ws[i], node = elt("div", [widget.node], "CodeMirror-linewidget" + (widget.className ? " " + widget.className : ""));
2253        if (!widget.handleMouseEvents) { node.setAttribute("cm-ignore-events", "true"); }
2254        positionLineWidget(widget, node, lineView, dims);
2255        cm.display.input.setUneditable(node);
2256        if (allowAbove && widget.above)
2257          { wrap.insertBefore(node, lineView.gutter || lineView.text); }
2258        else
2259          { wrap.appendChild(node); }
2260        signalLater(widget, "redraw");
2261      }
2262    }
2263  
2264    function positionLineWidget(widget, node, lineView, dims) {
2265      if (widget.noHScroll) {
2266    (lineView.alignable || (lineView.alignable = [])).push(node);
2267        var width = dims.wrapperWidth;
2268        node.style.left = dims.fixedPos + "px";
2269        if (!widget.coverGutter) {
2270          width -= dims.gutterTotalWidth;
2271          node.style.paddingLeft = dims.gutterTotalWidth + "px";
2272        }
2273        node.style.width = width + "px";
2274      }
2275      if (widget.coverGutter) {
2276        node.style.zIndex = 5;
2277        node.style.position = "relative";
2278        if (!widget.noHScroll) { node.style.marginLeft = -dims.gutterTotalWidth + "px"; }
2279      }
2280    }
2281  
2282    function widgetHeight(widget) {
2283      if (widget.height != null) { return widget.height }
2284      var cm = widget.doc.cm;
2285      if (!cm) { return 0 }
2286      if (!contains(document.body, widget.node)) {
2287        var parentStyle = "position: relative;";
2288        if (widget.coverGutter)
2289          { parentStyle += "margin-left: -" + cm.display.gutters.offsetWidth + "px;"; }
2290        if (widget.noHScroll)
2291          { parentStyle += "width: " + cm.display.wrapper.clientWidth + "px;"; }
2292        removeChildrenAndAdd(cm.display.measure, elt("div", [widget.node], null, parentStyle));
2293      }
2294      return widget.height = widget.node.parentNode.offsetHeight
2295    }
2296  
2297    // Return true when the given mouse event happened in a widget
2298    function eventInWidget(display, e) {
2299      for (var n = e_target(e); n != display.wrapper; n = n.parentNode) {
2300        if (!n || (n.nodeType == 1 && n.getAttribute("cm-ignore-events") == "true") ||
2301            (n.parentNode == display.sizer && n != display.mover))
2302          { return true }
2303      }
2304    }
2305  
2306    // POSITION MEASUREMENT
2307  
2308    function paddingTop(display) {return display.lineSpace.offsetTop}
2309    function paddingVert(display) {return display.mover.offsetHeight - display.lineSpace.offsetHeight}
2310    function paddingH(display) {
2311      if (display.cachedPaddingH) { return display.cachedPaddingH }
2312      var e = removeChildrenAndAdd(display.measure, elt("pre", "x", "CodeMirror-line-like"));
2313      var style = window.getComputedStyle ? window.getComputedStyle(e) : e.currentStyle;
2314      var data = {left: parseInt(style.paddingLeft), right: parseInt(style.paddingRight)};
2315      if (!isNaN(data.left) && !isNaN(data.right)) { display.cachedPaddingH = data; }
2316      return data
2317    }
2318  
2319    function scrollGap(cm) { return scrollerGap - cm.display.nativeBarWidth }
2320    function displayWidth(cm) {
2321      return cm.display.scroller.clientWidth - scrollGap(cm) - cm.display.barWidth
2322    }
2323    function displayHeight(cm) {
2324      return cm.display.scroller.clientHeight - scrollGap(cm) - cm.display.barHeight
2325    }
2326  
2327    // Ensure the lineView.wrapping.heights array is populated. This is
2328    // an array of bottom offsets for the lines that make up a drawn
2329    // line. When lineWrapping is on, there might be more than one
2330    // height.
2331    function ensureLineHeights(cm, lineView, rect) {
2332      var wrapping = cm.options.lineWrapping;
2333      var curWidth = wrapping && displayWidth(cm);
2334      if (!lineView.measure.heights || wrapping && lineView.measure.width != curWidth) {
2335        var heights = lineView.measure.heights = [];
2336        if (wrapping) {
2337          lineView.measure.width = curWidth;
2338          var rects = lineView.text.firstChild.getClientRects();
2339          for (var i = 0; i < rects.length - 1; i++) {
2340            var cur = rects[i], next = rects[i + 1];
2341            if (Math.abs(cur.bottom - next.bottom) > 2)
2342              { heights.push((cur.bottom + next.top) / 2 - rect.top); }
2343          }
2344        }
2345        heights.push(rect.bottom - rect.top);
2346      }
2347    }
2348  
2349    // Find a line map (mapping character offsets to text nodes) and a
2350    // measurement cache for the given line number. (A line view might
2351    // contain multiple lines when collapsed ranges are present.)
2352    function mapFromLineView(lineView, line, lineN) {
2353      if (lineView.line == line)
2354        { return {map: lineView.measure.map, cache: lineView.measure.cache} }
2355      if (lineView.rest) {
2356        for (var i = 0; i < lineView.rest.length; i++)
2357          { if (lineView.rest[i] == line)
2358            { return {map: lineView.measure.maps[i], cache: lineView.measure.caches[i]} } }
2359        for (var i$1 = 0; i$1 < lineView.rest.length; i$1++)
2360          { if (lineNo(lineView.rest[i$1]) > lineN)
2361            { return {map: lineView.measure.maps[i$1], cache: lineView.measure.caches[i$1], before: true} } }
2362      }
2363    }
2364  
2365    // Render a line into the hidden node display.externalMeasured. Used
2366    // when measurement is needed for a line that's not in the viewport.
2367    function updateExternalMeasurement(cm, line) {
2368      line = visualLine(line);
2369      var lineN = lineNo(line);
2370      var view = cm.display.externalMeasured = new LineView(cm.doc, line, lineN);
2371      view.lineN = lineN;
2372      var built = view.built = buildLineContent(cm, view);
2373      view.text = built.pre;
2374      removeChildrenAndAdd(cm.display.lineMeasure, built.pre);
2375      return view
2376    }
2377  
2378    // Get a {top, bottom, left, right} box (in line-local coordinates)
2379    // for a given character.
2380    function measureChar(cm, line, ch, bias) {
2381      return measureCharPrepared(cm, prepareMeasureForLine(cm, line), ch, bias)
2382    }
2383  
2384    // Find a line view that corresponds to the given line number.
2385    function findViewForLine(cm, lineN) {
2386      if (lineN >= cm.display.viewFrom && lineN < cm.display.viewTo)
2387        { return cm.display.view[findViewIndex(cm, lineN)] }
2388      var ext = cm.display.externalMeasured;
2389      if (ext && lineN >= ext.lineN && lineN < ext.lineN + ext.size)
2390        { return ext }
2391    }
2392  
2393    // Measurement can be split in two steps, the set-up work that
2394    // applies to the whole line, and the measurement of the actual
2395    // character. Functions like coordsChar, that need to do a lot of
2396    // measurements in a row, can thus ensure that the set-up work is
2397    // only done once.
2398    function prepareMeasureForLine(cm, line) {
2399      var lineN = lineNo(line);
2400      var view = findViewForLine(cm, lineN);
2401      if (view && !view.text) {
2402        view = null;
2403      } else if (view && view.changes) {
2404        updateLineForChanges(cm, view, lineN, getDimensions(cm));
2405        cm.curOp.forceUpdate = true;
2406      }
2407      if (!view)
2408        { view = updateExternalMeasurement(cm, line); }
2409  
2410      var info = mapFromLineView(view, line, lineN);
2411      return {
2412        line: line, view: view, rect: null,
2413        map: info.map, cache: info.cache, before: info.before,
2414        hasHeights: false
2415      }
2416    }
2417  
2418    // Given a prepared measurement object, measures the position of an
2419    // actual character (or fetches it from the cache).
2420    function measureCharPrepared(cm, prepared, ch, bias, varHeight) {
2421      if (prepared.before) { ch = -1; }
2422      var key = ch + (bias || ""), found;
2423      if (prepared.cache.hasOwnProperty(key)) {
2424        found = prepared.cache[key];
2425      } else {
2426        if (!prepared.rect)
2427          { prepared.rect = prepared.view.text.getBoundingClientRect(); }
2428        if (!prepared.hasHeights) {
2429          ensureLineHeights(cm, prepared.view, prepared.rect);
2430          prepared.hasHeights = true;
2431        }
2432        found = measureCharInner(cm, prepared, ch, bias);
2433        if (!found.bogus) { prepared.cache[key] = found; }
2434      }
2435      return {left: found.left, right: found.right,
2436              top: varHeight ? found.rtop : found.top,
2437              bottom: varHeight ? found.rbottom : found.bottom}
2438    }
2439  
2440    var nullRect = {left: 0, right: 0, top: 0, bottom: 0};
2441  
2442    function nodeAndOffsetInLineMap(map, ch, bias) {
2443      var node, start, end, collapse, mStart, mEnd;
2444      // First, search the line map for the text node corresponding to,
2445      // or closest to, the target character.
2446      for (var i = 0; i < map.length; i += 3) {
2447        mStart = map[i];
2448        mEnd = map[i + 1];
2449        if (ch < mStart) {
2450          start = 0; end = 1;
2451          collapse = "left";
2452        } else if (ch < mEnd) {
2453          start = ch - mStart;
2454          end = start + 1;
2455        } else if (i == map.length - 3 || ch == mEnd && map[i + 3] > ch) {
2456          end = mEnd - mStart;
2457          start = end - 1;
2458          if (ch >= mEnd) { collapse = "right"; }
2459        }
2460        if (start != null) {
2461          node = map[i + 2];
2462          if (mStart == mEnd && bias == (node.insertLeft ? "left" : "right"))
2463            { collapse = bias; }
2464          if (bias == "left" && start == 0)
2465            { while (i && map[i - 2] == map[i - 3] && map[i - 1].insertLeft) {
2466              node = map[(i -= 3) + 2];
2467              collapse = "left";
2468            } }
2469          if (bias == "right" && start == mEnd - mStart)
2470            { while (i < map.length - 3 && map[i + 3] == map[i + 4] && !map[i + 5].insertLeft) {
2471              node = map[(i += 3) + 2];
2472              collapse = "right";
2473            } }
2474          break
2475        }
2476      }
2477      return {node: node, start: start, end: end, collapse: collapse, coverStart: mStart, coverEnd: mEnd}
2478    }
2479  
2480    function getUsefulRect(rects, bias) {
2481      var rect = nullRect;
2482      if (bias == "left") { for (var i = 0; i < rects.length; i++) {
2483        if ((rect = rects[i]).left != rect.right) { break }
2484      } } else { for (var i$1 = rects.length - 1; i$1 >= 0; i$1--) {
2485        if ((rect = rects[i$1]).left != rect.right) { break }
2486      } }
2487      return rect
2488    }
2489  
2490    function measureCharInner(cm, prepared, ch, bias) {
2491      var place = nodeAndOffsetInLineMap(prepared.map, ch, bias);
2492      var node = place.node, start = place.start, end = place.end, collapse = place.collapse;
2493  
2494      var rect;
2495      if (node.nodeType == 3) { // If it is a text node, use a range to retrieve the coordinates.
2496        for (var i$1 = 0; i$1 < 4; i$1++) { // Retry a maximum of 4 times when nonsense rectangles are returned
2497          while (start && isExtendingChar(prepared.line.text.charAt(place.coverStart + start))) { --start; }
2498          while (place.coverStart + end < place.coverEnd && isExtendingChar(prepared.line.text.charAt(place.coverStart + end))) { ++end; }
2499          if (ie && ie_version < 9 && start == 0 && end == place.coverEnd - place.coverStart)
2500            { rect = node.parentNode.getBoundingClientRect(); }
2501          else
2502            { rect = getUsefulRect(range(node, start, end).getClientRects(), bias); }
2503          if (rect.left || rect.right || start == 0) { break }
2504          end = start;
2505          start = start - 1;
2506          collapse = "right";
2507        }
2508        if (ie && ie_version < 11) { rect = maybeUpdateRectForZooming(cm.display.measure, rect); }
2509      } else { // If it is a widget, simply get the box for the whole widget.
2510        if (start > 0) { collapse = bias = "right"; }
2511        var rects;
2512        if (cm.options.lineWrapping && (rects = node.getClientRects()).length > 1)
2513          { rect = rects[bias == "right" ? rects.length - 1 : 0]; }
2514        else
2515          { rect = node.getBoundingClientRect(); }
2516      }
2517      if (ie && ie_version < 9 && !start && (!rect || !rect.left && !rect.right)) {
2518        var rSpan = node.parentNode.getClientRects()[0];
2519        if (rSpan)
2520          { rect = {left: rSpan.left, right: rSpan.left + charWidth(cm.display), top: rSpan.top, bottom: rSpan.bottom}; }
2521        else
2522          { rect = nullRect; }
2523      }
2524  
2525      var rtop = rect.top - prepared.rect.top, rbot = rect.bottom - prepared.rect.top;
2526      var mid = (rtop + rbot) / 2;
2527      var heights = prepared.view.measure.heights;
2528      var i = 0;
2529      for (; i < heights.length - 1; i++)
2530        { if (mid < heights[i]) { break } }
2531      var top = i ? heights[i - 1] : 0, bot = heights[i];
2532      var result = {left: (collapse == "right" ? rect.right : rect.left) - prepared.rect.left,
2533                    right: (collapse == "left" ? rect.left : rect.right) - prepared.rect.left,
2534                    top: top, bottom: bot};
2535      if (!rect.left && !rect.right) { result.bogus = true; }
2536      if (!cm.options.singleCursorHeightPerLine) { result.rtop = rtop; result.rbottom = rbot; }
2537  
2538      return result
2539    }
2540  
2541    // Work around problem with bounding client rects on ranges being
2542    // returned incorrectly when zoomed on IE10 and below.
2543    function maybeUpdateRectForZooming(measure, rect) {
2544      if (!window.screen || screen.logicalXDPI == null ||
2545          screen.logicalXDPI == screen.deviceXDPI || !hasBadZoomedRects(measure))
2546        { return rect }
2547      var scaleX = screen.logicalXDPI / screen.deviceXDPI;
2548      var scaleY = screen.logicalYDPI / screen.deviceYDPI;
2549      return {left: rect.left * scaleX, right: rect.right * scaleX,
2550              top: rect.top * scaleY, bottom: rect.bottom * scaleY}
2551    }
2552  
2553    function clearLineMeasurementCacheFor(lineView) {
2554      if (lineView.measure) {
2555        lineView.measure.cache = {};
2556        lineView.measure.heights = null;
2557        if (lineView.rest) { for (var i = 0; i < lineView.rest.length; i++)
2558          { lineView.measure.caches[i] = {}; } }
2559      }
2560    }
2561  
2562    function clearLineMeasurementCache(cm) {
2563      cm.display.externalMeasure = null;
2564      removeChildren(cm.display.lineMeasure);
2565      for (var i = 0; i < cm.display.view.length; i++)
2566        { clearLineMeasurementCacheFor(cm.display.view[i]); }
2567    }
2568  
2569    function clearCaches(cm) {
2570      clearLineMeasurementCache(cm);
2571      cm.display.cachedCharWidth = cm.display.cachedTextHeight = cm.display.cachedPaddingH = null;
2572      if (!cm.options.lineWrapping) { cm.display.maxLineChanged = true; }
2573      cm.display.lineNumChars = null;
2574    }
2575  
2576    function pageScrollX() {
2577      // Work around https://bugs.chromium.org/p/chromium/issues/detail?id=489206
2578      // which causes page_Offset and bounding client rects to use
2579      // different reference viewports and invalidate our calculations.
2580      if (chrome && android) { return -(document.body.getBoundingClientRect().left - parseInt(getComputedStyle(document.body).marginLeft)) }
2581      return window.pageXOffset || (document.documentElement || document.body).scrollLeft
2582    }
2583    function pageScrollY() {
2584      if (chrome && android) { return -(document.body.getBoundingClientRect().top - parseInt(getComputedStyle(document.body).marginTop)) }
2585      return window.pageYOffset || (document.documentElement || document.body).scrollTop
2586    }
2587  
2588    function widgetTopHeight(lineObj) {
2589      var ref = visualLine(lineObj);
2590      var widgets = ref.widgets;
2591      var height = 0;
2592      if (widgets) { for (var i = 0; i < widgets.length; ++i) { if (widgets[i].above)
2593        { height += widgetHeight(widgets[i]); } } }
2594      return height
2595    }
2596  
2597    // Converts a {top, bottom, left, right} box from line-local
2598    // coordinates into another coordinate system. Context may be one of
2599    // "line", "div" (display.lineDiv), "local"./null (editor), "window",
2600    // or "page".
2601    function intoCoordSystem(cm, lineObj, rect, context, includeWidgets) {
2602      if (!includeWidgets) {
2603        var height = widgetTopHeight(lineObj);
2604        rect.top += height; rect.bottom += height;
2605      }
2606      if (context == "line") { return rect }
2607      if (!context) { context = "local"; }
2608      var yOff = heightAtLine(lineObj);
2609      if (context == "local") { yOff += paddingTop(cm.display); }
2610      else { yOff -= cm.display.viewOffset; }
2611      if (context == "page" || context == "window") {
2612        var lOff = cm.display.lineSpace.getBoundingClientRect();
2613        yOff += lOff.top + (context == "window" ? 0 : pageScrollY());
2614        var xOff = lOff.left + (context == "window" ? 0 : pageScrollX());
2615        rect.left += xOff; rect.right += xOff;
2616      }
2617      rect.top += yOff; rect.bottom += yOff;
2618      return rect
2619    }
2620  
2621    // Coverts a box from "div" coords to another coordinate system.
2622    // Context may be "window", "page", "div", or "local"./null.
2623    function fromCoordSystem(cm, coords, context) {
2624      if (context == "div") { return coords }
2625      var left = coords.left, top = coords.top;
2626      // First move into "page" coordinate system
2627      if (context == "page") {
2628        left -= pageScrollX();
2629        top -= pageScrollY();
2630      } else if (context == "local" || !context) {
2631        var localBox = cm.display.sizer.getBoundingClientRect();
2632        left += localBox.left;
2633        top += localBox.top;
2634      }
2635  
2636      var lineSpaceBox = cm.display.lineSpace.getBoundingClientRect();
2637      return {left: left - lineSpaceBox.left, top: top - lineSpaceBox.top}
2638    }
2639  
2640    function charCoords(cm, pos, context, lineObj, bias) {
2641      if (!lineObj) { lineObj = getLine(cm.doc, pos.line); }
2642      return intoCoordSystem(cm, lineObj, measureChar(cm, lineObj, pos.ch, bias), context)
2643    }
2644  
2645    // Returns a box for a given cursor position, which may have an
2646    // 'other' property containing the position of the secondary cursor
2647    // on a bidi boundary.
2648    // A cursor Pos(line, char, "before") is on the same visual line as `char - 1`
2649    // and after `char - 1` in writing order of `char - 1`
2650    // A cursor Pos(line, char, "after") is on the same visual line as `char`
2651    // and before `char` in writing order of `char`
2652    // Examples (upper-case letters are RTL, lower-case are LTR):
2653    //     Pos(0, 1, ...)
2654    //     before   after
2655    // ab     a|b     a|b
2656    // aB     a|B     aB|
2657    // Ab     |Ab     A|b
2658    // AB     B|A     B|A
2659    // Every position after the last character on a line is considered to stick
2660    // to the last character on the line.
2661    function cursorCoords(cm, pos, context, lineObj, preparedMeasure, varHeight) {
2662      lineObj = lineObj || getLine(cm.doc, pos.line);
2663      if (!preparedMeasure) { preparedMeasure = prepareMeasureForLine(cm, lineObj); }
2664      function get(ch, right) {
2665        var m = measureCharPrepared(cm, preparedMeasure, ch, right ? "right" : "left", varHeight);
2666        if (right) { m.left = m.right; } else { m.right = m.left; }
2667        return intoCoordSystem(cm, lineObj, m, context)
2668      }
2669      var order = getOrder(lineObj, cm.doc.direction), ch = pos.ch, sticky = pos.sticky;
2670      if (ch >= lineObj.text.length) {
2671        ch = lineObj.text.length;
2672        sticky = "before";
2673      } else if (ch <= 0) {
2674        ch = 0;
2675        sticky = "after";
2676      }
2677      if (!order) { return get(sticky == "before" ? ch - 1 : ch, sticky == "before") }
2678  
2679      function getBidi(ch, partPos, invert) {
2680        var part = order[partPos], right = part.level == 1;
2681        return get(invert ? ch - 1 : ch, right != invert)
2682      }
2683      var partPos = getBidiPartAt(order, ch, sticky);
2684      var other = bidiOther;
2685      var val = getBidi(ch, partPos, sticky == "before");
2686      if (other != null) { val.other = getBidi(ch, other, sticky != "before"); }
2687      return val
2688    }
2689  
2690    // Used to cheaply estimate the coordinates for a position. Used for
2691    // intermediate scroll updates.
2692    function estimateCoords(cm, pos) {
2693      var left = 0;
2694      pos = clipPos(cm.doc, pos);
2695      if (!cm.options.lineWrapping) { left = charWidth(cm.display) * pos.ch; }
2696      var lineObj = getLine(cm.doc, pos.line);
2697      var top = heightAtLine(lineObj) + paddingTop(cm.display);
2698      return {left: left, right: left, top: top, bottom: top + lineObj.height}
2699    }
2700  
2701    // Positions returned by coordsChar contain some extra information.
2702    // xRel is the relative x position of the input coordinates compared
2703    // to the found position (so xRel > 0 means the coordinates are to
2704    // the right of the character position, for example). When outside
2705    // is true, that means the coordinates lie outside the line's
2706    // vertical range.
2707    function PosWithInfo(line, ch, sticky, outside, xRel) {
2708      var pos = Pos(line, ch, sticky);
2709      pos.xRel = xRel;
2710      if (outside) { pos.outside = outside; }
2711      return pos
2712    }
2713  
2714    // Compute the character position closest to the given coordinates.
2715    // Input must be lineSpace-local ("div" coordinate system).
2716    function coordsChar(cm, x, y) {
2717      var doc = cm.doc;
2718      y += cm.display.viewOffset;
2719      if (y < 0) { return PosWithInfo(doc.first, 0, null, -1, -1) }
2720      var lineN = lineAtHeight(doc, y), last = doc.first + doc.size - 1;
2721      if (lineN > last)
2722        { return PosWithInfo(doc.first + doc.size - 1, getLine(doc, last).text.length, null, 1, 1) }
2723      if (x < 0) { x = 0; }
2724  
2725      var lineObj = getLine(doc, lineN);
2726      for (;;) {
2727        var found = coordsCharInner(cm, lineObj, lineN, x, y);
2728        var collapsed = collapsedSpanAround(lineObj, found.ch + (found.xRel > 0 || found.outside > 0 ? 1 : 0));
2729        if (!collapsed) { return found }
2730        var rangeEnd = collapsed.find(1);
2731        if (rangeEnd.line == lineN) { return rangeEnd }
2732        lineObj = getLine(doc, lineN = rangeEnd.line);
2733      }
2734    }
2735  
2736    function wrappedLineExtent(cm, lineObj, preparedMeasure, y) {
2737      y -= widgetTopHeight(lineObj);
2738      var end = lineObj.text.length;
2739      var begin = findFirst(function (ch) { return measureCharPrepared(cm, preparedMeasure, ch - 1).bottom <= y; }, end, 0);
2740      end = findFirst(function (ch) { return measureCharPrepared(cm, preparedMeasure, ch).top > y; }, begin, end);
2741      return {begin: begin, end: end}
2742    }
2743  
2744    function wrappedLineExtentChar(cm, lineObj, preparedMeasure, target) {
2745      if (!preparedMeasure) { preparedMeasure = prepareMeasureForLine(cm, lineObj); }
2746      var targetTop = intoCoordSystem(cm, lineObj, measureCharPrepared(cm, preparedMeasure, target), "line").top;
2747      return wrappedLineExtent(cm, lineObj, preparedMeasure, targetTop)
2748    }
2749  
2750    // Returns true if the given side of a box is after the given
2751    // coordinates, in top-to-bottom, left-to-right order.
2752    function boxIsAfter(box, x, y, left) {
2753      return box.bottom <= y ? false : box.top > y ? true : (left ? box.left : box.right) > x
2754    }
2755  
2756    function coordsCharInner(cm, lineObj, lineNo, x, y) {
2757      // Move y into line-local coordinate space
2758      y -= heightAtLine(lineObj);
2759      var preparedMeasure = prepareMeasureForLine(cm, lineObj);
2760      // When directly calling `measureCharPrepared`, we have to adjust
2761      // for the widgets at this line.
2762      var widgetHeight = widgetTopHeight(lineObj);
2763      var begin = 0, end = lineObj.text.length, ltr = true;
2764  
2765      var order = getOrder(lineObj, cm.doc.direction);
2766      // If the line isn't plain left-to-right text, first figure out
2767      // which bidi section the coordinates fall into.
2768      if (order) {
2769        var part = (cm.options.lineWrapping ? coordsBidiPartWrapped : coordsBidiPart)
2770                     (cm, lineObj, lineNo, preparedMeasure, order, x, y);
2771        ltr = part.level != 1;
2772        // The awkward -1 offsets are needed because findFirst (called
2773        // on these below) will treat its first bound as inclusive,
2774        // second as exclusive, but we want to actually address the
2775        // characters in the part's range
2776        begin = ltr ? part.from : part.to - 1;
2777        end = ltr ? part.to : part.from - 1;
2778      }
2779  
2780      // A binary search to find the first character whose bounding box
2781      // starts after the coordinates. If we run across any whose box wrap
2782      // the coordinates, store that.
2783      var chAround = null, boxAround = null;
2784      var ch = findFirst(function (ch) {
2785        var box = measureCharPrepared(cm, preparedMeasure, ch);
2786        box.top += widgetHeight; box.bottom += widgetHeight;
2787        if (!boxIsAfter(box, x, y, false)) { return false }
2788        if (box.top <= y && box.left <= x) {
2789          chAround = ch;
2790          boxAround = box;
2791        }
2792        return true
2793      }, begin, end);
2794  
2795      var baseX, sticky, outside = false;
2796      // If a box around the coordinates was found, use that
2797      if (boxAround) {
2798        // Distinguish coordinates nearer to the left or right side of the box
2799        var atLeft = x - boxAround.left < boxAround.right - x, atStart = atLeft == ltr;
2800        ch = chAround + (atStart ? 0 : 1);
2801        sticky = atStart ? "after" : "before";
2802        baseX = atLeft ? boxAround.left : boxAround.right;
2803      } else {
2804        // (Adjust for extended bound, if necessary.)
2805        if (!ltr && (ch == end || ch == begin)) { ch++; }
2806        // To determine which side to associate with, get the box to the
2807        // left of the character and compare it's vertical position to the
2808        // coordinates
2809        sticky = ch == 0 ? "after" : ch == lineObj.text.length ? "before" :
2810          (measureCharPrepared(cm, preparedMeasure, ch - (ltr ? 1 : 0)).bottom + widgetHeight <= y) == ltr ?
2811          "after" : "before";
2812        // Now get accurate coordinates for this place, in order to get a
2813        // base X position
2814        var coords = cursorCoords(cm, Pos(lineNo, ch, sticky), "line", lineObj, preparedMeasure);
2815        baseX = coords.left;
2816        outside = y < coords.top ? -1 : y >= coords.bottom ? 1 : 0;
2817      }
2818  
2819      ch = skipExtendingChars(lineObj.text, ch, 1);
2820      return PosWithInfo(lineNo, ch, sticky, outside, x - baseX)
2821    }
2822  
2823    function coordsBidiPart(cm, lineObj, lineNo, preparedMeasure, order, x, y) {
2824      // Bidi parts are sorted left-to-right, and in a non-line-wrapping
2825      // situation, we can take this ordering to correspond to the visual
2826      // ordering. This finds the first part whose end is after the given
2827      // coordinates.
2828      var index = findFirst(function (i) {
2829        var part = order[i], ltr = part.level != 1;
2830        return boxIsAfter(cursorCoords(cm, Pos(lineNo, ltr ? part.to : part.from, ltr ? "before" : "after"),
2831                                       "line", lineObj, preparedMeasure), x, y, true)
2832      }, 0, order.length - 1);
2833      var part = order[index];
2834      // If this isn't the first part, the part's start is also after
2835      // the coordinates, and the coordinates aren't on the same line as
2836      // that start, move one part back.
2837      if (index > 0) {
2838        var ltr = part.level != 1;
2839        var start = cursorCoords(cm, Pos(lineNo, ltr ? part.from : part.to, ltr ? "after" : "before"),
2840                                 "line", lineObj, preparedMeasure);
2841        if (boxIsAfter(start, x, y, true) && start.top > y)
2842          { part = order[index - 1]; }
2843      }
2844      return part
2845    }
2846  
2847    function coordsBidiPartWrapped(cm, lineObj, _lineNo, preparedMeasure, order, x, y) {
2848      // In a wrapped line, rtl text on wrapping boundaries can do things
2849      // that don't correspond to the ordering in our `order` array at
2850      // all, so a binary search doesn't work, and we want to return a
2851      // part that only spans one line so that the binary search in
2852      // coordsCharInner is safe. As such, we first find the extent of the
2853      // wrapped line, and then do a flat search in which we discard any
2854      // spans that aren't on the line.
2855      var ref = wrappedLineExtent(cm, lineObj, preparedMeasure, y);
2856      var begin = ref.begin;
2857      var end = ref.end;
2858      if (/\s/.test(lineObj.text.charAt(end - 1))) { end--; }
2859      var part = null, closestDist = null;
2860      for (var i = 0; i < order.length; i++) {
2861        var p = order[i];
2862        if (p.from >= end || p.to <= begin) { continue }
2863        var ltr = p.level != 1;
2864        var endX = measureCharPrepared(cm, preparedMeasure, ltr ? Math.min(end, p.to) - 1 : Math.max(begin, p.from)).right;
2865        // Weigh against spans ending before this, so that they are only
2866        // picked if nothing ends after
2867        var dist = endX < x ? x - endX + 1e9 : endX - x;
2868        if (!part || closestDist > dist) {
2869          part = p;
2870          closestDist = dist;
2871        }
2872      }
2873      if (!part) { part = order[order.length - 1]; }
2874      // Clip the part to the wrapped line.
2875      if (part.from < begin) { part = {from: begin, to: part.to, level: part.level}; }
2876      if (part.to > end) { part = {from: part.from, to: end, level: part.level}; }
2877      return part
2878    }
2879  
2880    var measureText;
2881    // Compute the default text height.
2882    function textHeight(display) {
2883      if (display.cachedTextHeight != null) { return display.cachedTextHeight }
2884      if (measureText == null) {
2885        measureText = elt("pre", null, "CodeMirror-line-like");
2886        // Measure a bunch of lines, for browsers that compute
2887        // fractional heights.
2888        for (var i = 0; i < 49; ++i) {
2889          measureText.appendChild(document.createTextNode("x"));
2890          measureText.appendChild(elt("br"));
2891        }
2892        measureText.appendChild(document.createTextNode("x"));
2893      }
2894      removeChildrenAndAdd(display.measure, measureText);
2895      var height = measureText.offsetHeight / 50;
2896      if (height > 3) { display.cachedTextHeight = height; }
2897      removeChildren(display.measure);
2898      return height || 1
2899    }
2900  
2901    // Compute the default character width.
2902    function charWidth(display) {
2903      if (display.cachedCharWidth != null) { return display.cachedCharWidth }
2904      var anchor = elt("span", "xxxxxxxxxx");
2905      var pre = elt("pre", [anchor], "CodeMirror-line-like");
2906      removeChildrenAndAdd(display.measure, pre);
2907      var rect = anchor.getBoundingClientRect(), width = (rect.right - rect.left) / 10;
2908      if (width > 2) { display.cachedCharWidth = width; }
2909      return width || 10
2910    }
2911  
2912    // Do a bulk-read of the DOM positions and sizes needed to draw the
2913    // view, so that we don't interleave reading and writing to the DOM.
2914    function getDimensions(cm) {
2915      var d = cm.display, left = {}, width = {};
2916      var gutterLeft = d.gutters.clientLeft;
2917      for (var n = d.gutters.firstChild, i = 0; n; n = n.nextSibling, ++i) {
2918        var id = cm.display.gutterSpecs[i].className;
2919        left[id] = n.offsetLeft + n.clientLeft + gutterLeft;
2920        width[id] = n.clientWidth;
2921      }
2922      return {fixedPos: compensateForHScroll(d),
2923              gutterTotalWidth: d.gutters.offsetWidth,
2924              gutterLeft: left,
2925              gutterWidth: width,
2926              wrapperWidth: d.wrapper.clientWidth}
2927    }
2928  
2929    // Computes display.scroller.scrollLeft + display.gutters.offsetWidth,
2930    // but using getBoundingClientRect to get a sub-pixel-accurate
2931    // result.
2932    function compensateForHScroll(display) {
2933      return display.scroller.getBoundingClientRect().left - display.sizer.getBoundingClientRect().left
2934    }
2935  
2936    // Returns a function that estimates the height of a line, to use as
2937    // first approximation until the line becomes visible (and is thus
2938    // properly measurable).
2939    function estimateHeight(cm) {
2940      var th = textHeight(cm.display), wrapping = cm.options.lineWrapping;
2941      var perLine = wrapping && Math.max(5, cm.display.scroller.clientWidth / charWidth(cm.display) - 3);
2942      return function (line) {
2943        if (lineIsHidden(cm.doc, line)) { return 0 }
2944  
2945        var widgetsHeight = 0;
2946        if (line.widgets) { for (var i = 0; i < line.widgets.length; i++) {
2947          if (line.widgets[i].height) { widgetsHeight += line.widgets[i].height; }
2948        } }
2949  
2950        if (wrapping)
2951          { return widgetsHeight + (Math.ceil(line.text.length / perLine) || 1) * th }
2952        else
2953          { return widgetsHeight + th }
2954      }
2955    }
2956  
2957    function estimateLineHeights(cm) {
2958      var doc = cm.doc, est = estimateHeight(cm);
2959      doc.iter(function (line) {
2960        var estHeight = est(line);
2961        if (estHeight != line.height) { updateLineHeight(line, estHeight); }
2962      });
2963    }
2964  
2965    // Given a mouse event, find the corresponding position. If liberal
2966    // is false, it checks whether a gutter or scrollbar was clicked,
2967    // and returns null if it was. forRect is used by rectangular
2968    // selections, and tries to estimate a character position even for
2969    // coordinates beyond the right of the text.
2970    function posFromMouse(cm, e, liberal, forRect) {
2971      var display = cm.display;
2972      if (!liberal && e_target(e).getAttribute("cm-not-content") == "true") { return null }
2973  
2974      var x, y, space = display.lineSpace.getBoundingClientRect();
2975      // Fails unpredictably on IE[67] when mouse is dragged around quickly.
2976      try { x = e.clientX - space.left; y = e.clientY - space.top; }
2977      catch (e$1) { return null }
2978      var coords = coordsChar(cm, x, y), line;
2979      if (forRect && coords.xRel > 0 && (line = getLine(cm.doc, coords.line).text).length == coords.ch) {
2980        var colDiff = countColumn(line, line.length, cm.options.tabSize) - line.length;
2981        coords = Pos(coords.line, Math.max(0, Math.round((x - paddingH(cm.display).left) / charWidth(cm.display)) - colDiff));
2982      }
2983      return coords
2984    }
2985  
2986    // Find the view element corresponding to a given line. Return null
2987    // when the line isn't visible.
2988    function findViewIndex(cm, n) {
2989      if (n >= cm.display.viewTo) { return null }
2990      n -= cm.display.viewFrom;
2991      if (n < 0) { return null }
2992      var view = cm.display.view;
2993      for (var i = 0; i < view.length; i++) {
2994        n -= view[i].size;
2995        if (n < 0) { return i }
2996      }
2997    }
2998  
2999    // Updates the display.view data structure for a given change to the
3000    // document. From and to are in pre-change coordinates. Lendiff is
3001    // the amount of lines added or subtracted by the change. This is
3002    // used for changes that span multiple lines, or change the way
3003    // lines are divided into visual lines. regLineChange (below)
3004    // registers single-line changes.
3005    function regChange(cm, from, to, lendiff) {
3006      if (from == null) { from = cm.doc.first; }
3007      if (to == null) { to = cm.doc.first + cm.doc.size; }
3008      if (!lendiff) { lendiff = 0; }
3009  
3010      var display = cm.display;
3011      if (lendiff && to < display.viewTo &&
3012          (display.updateLineNumbers == null || display.updateLineNumbers > from))
3013        { display.updateLineNumbers = from; }
3014  
3015      cm.curOp.viewChanged = true;
3016  
3017      if (from >= display.viewTo) { // Change after
3018        if (sawCollapsedSpans && visualLineNo(cm.doc, from) < display.viewTo)
3019          { resetView(cm); }
3020      } else if (to <= display.viewFrom) { // Change before
3021        if (sawCollapsedSpans && visualLineEndNo(cm.doc, to + lendiff) > display.viewFrom) {
3022          resetView(cm);
3023        } else {
3024          display.viewFrom += lendiff;
3025          display.viewTo += lendiff;
3026        }
3027      } else if (from <= display.viewFrom && to >= display.viewTo) { // Full overlap
3028        resetView(cm);
3029      } else if (from <= display.viewFrom) { // Top overlap
3030        var cut = viewCuttingPoint(cm, to, to + lendiff, 1);
3031        if (cut) {
3032          display.view = display.view.slice(cut.index);
3033          display.viewFrom = cut.lineN;
3034          display.viewTo += lendiff;
3035        } else {
3036          resetView(cm);
3037        }
3038      } else if (to >= display.viewTo) { // Bottom overlap
3039        var cut$1 = viewCuttingPoint(cm, from, from, -1);
3040        if (cut$1) {
3041          display.view = display.view.slice(0, cut$1.index);
3042          display.viewTo = cut$1.lineN;
3043        } else {
3044          resetView(cm);
3045        }
3046      } else { // Gap in the middle
3047        var cutTop = viewCuttingPoint(cm, from, from, -1);
3048        var cutBot = viewCuttingPoint(cm, to, to + lendiff, 1);
3049        if (cutTop && cutBot) {
3050          display.view = display.view.slice(0, cutTop.index)
3051            .concat(buildViewArray(cm, cutTop.lineN, cutBot.lineN))
3052            .concat(display.view.slice(cutBot.index));
3053          display.viewTo += lendiff;
3054        } else {
3055          resetView(cm);
3056        }
3057      }
3058  
3059      var ext = display.externalMeasured;
3060      if (ext) {
3061        if (to < ext.lineN)
3062          { ext.lineN += lendiff; }
3063        else if (from < ext.lineN + ext.size)
3064          { display.externalMeasured = null; }
3065      }
3066    }
3067  
3068    // Register a change to a single line. Type must be one of "text",
3069    // "gutter", "class", "widget"
3070    function regLineChange(cm, line, type) {
3071      cm.curOp.viewChanged = true;
3072      var display = cm.display, ext = cm.display.externalMeasured;
3073      if (ext && line >= ext.lineN && line < ext.lineN + ext.size)
3074        { display.externalMeasured = null; }
3075  
3076      if (line < display.viewFrom || line >= display.viewTo) { return }
3077      var lineView = display.view[findViewIndex(cm, line)];
3078      if (lineView.node == null) { return }
3079      var arr = lineView.changes || (lineView.changes = []);
3080      if (indexOf(arr, type) == -1) { arr.push(type); }
3081    }
3082  
3083    // Clear the view.
3084    function resetView(cm) {
3085      cm.display.viewFrom = cm.display.viewTo = cm.doc.first;
3086      cm.display.view = [];
3087      cm.display.viewOffset = 0;
3088    }
3089  
3090    function viewCuttingPoint(cm, oldN, newN, dir) {
3091      var index = findViewIndex(cm, oldN), diff, view = cm.display.view;
3092      if (!sawCollapsedSpans || newN == cm.doc.first + cm.doc.size)
3093        { return {index: index, lineN: newN} }
3094      var n = cm.display.viewFrom;
3095      for (var i = 0; i < index; i++)
3096        { n += view[i].size; }
3097      if (n != oldN) {
3098        if (dir > 0) {
3099          if (index == view.length - 1) { return null }
3100          diff = (n + view[index].size) - oldN;
3101          index++;
3102        } else {
3103          diff = n - oldN;
3104        }
3105        oldN += diff; newN += diff;
3106      }
3107      while (visualLineNo(cm.doc, newN) != newN) {
3108        if (index == (dir < 0 ? 0 : view.length - 1)) { return null }
3109        newN += dir * view[index - (dir < 0 ? 1 : 0)].size;
3110        index += dir;
3111      }
3112      return {index: index, lineN: newN}
3113    }
3114  
3115    // Force the view to cover a given range, adding empty view element
3116    // or clipping off existing ones as needed.
3117    function adjustView(cm, from, to) {
3118      var display = cm.display, view = display.view;
3119      if (view.length == 0 || from >= display.viewTo || to <= display.viewFrom) {
3120        display.view = buildViewArray(cm, from, to);
3121        display.viewFrom = from;
3122      } else {
3123        if (display.viewFrom > from)
3124          { display.view = buildViewArray(cm, from, display.viewFrom).concat(display.view); }
3125        else if (display.viewFrom < from)
3126          { display.view = display.view.slice(findViewIndex(cm, from)); }
3127        display.viewFrom = from;
3128        if (display.viewTo < to)
3129          { display.view = display.view.concat(buildViewArray(cm, display.viewTo, to)); }
3130        else if (display.viewTo > to)
3131          { display.view = display.view.slice(0, findViewIndex(cm, to)); }
3132      }
3133      display.viewTo = to;
3134    }
3135  
3136    // Count the number of lines in the view whose DOM representation is
3137    // out of date (or nonexistent).
3138    function countDirtyView(cm) {
3139      var view = cm.display.view, dirty = 0;
3140      for (var i = 0; i < view.length; i++) {
3141        var lineView = view[i];
3142        if (!lineView.hidden && (!lineView.node || lineView.changes)) { ++dirty; }
3143      }
3144      return dirty
3145    }
3146  
3147    function updateSelection(cm) {
3148      cm.display.input.showSelection(cm.display.input.prepareSelection());
3149    }
3150  
3151    function prepareSelection(cm, primary) {
3152      if ( primary === void 0 ) primary = true;
3153  
3154      var doc = cm.doc, result = {};
3155      var curFragment = result.cursors = document.createDocumentFragment();
3156      var selFragment = result.selection = document.createDocumentFragment();
3157  
3158      var customCursor = cm.options.$customCursor;
3159      if (customCursor) { primary = true; }
3160      for (var i = 0; i < doc.sel.ranges.length; i++) {
3161        if (!primary && i == doc.sel.primIndex) { continue }
3162        var range = doc.sel.ranges[i];
3163        if (range.from().line >= cm.display.viewTo || range.to().line < cm.display.viewFrom) { continue }
3164        var collapsed = range.empty();
3165        if (customCursor) {
3166          var head = customCursor(cm, range);
3167          if (head) { drawSelectionCursor(cm, head, curFragment); }
3168        } else if (collapsed || cm.options.showCursorWhenSelecting) {
3169          drawSelectionCursor(cm, range.head, curFragment);
3170        }
3171        if (!collapsed)
3172          { drawSelectionRange(cm, range, selFragment); }
3173      }
3174      return result
3175    }
3176  
3177    // Draws a cursor for the given range
3178    function drawSelectionCursor(cm, head, output) {
3179      var pos = cursorCoords(cm, head, "div", null, null, !cm.options.singleCursorHeightPerLine);
3180  
3181      var cursor = output.appendChild(elt("div", "\u00a0", "CodeMirror-cursor"));
3182      cursor.style.left = pos.left + "px";
3183      cursor.style.top = pos.top + "px";
3184      cursor.style.height = Math.max(0, pos.bottom - pos.top) * cm.options.cursorHeight + "px";
3185  
3186      if (/\bcm-fat-cursor\b/.test(cm.getWrapperElement().className)) {
3187        var charPos = charCoords(cm, head, "div", null, null);
3188        var width = charPos.right - charPos.left;
3189        cursor.style.width = (width > 0 ? width : cm.defaultCharWidth()) + "px";
3190      }
3191  
3192      if (pos.other) {
3193        // Secondary cursor, shown when on a 'jump' in bi-directional text
3194        var otherCursor = output.appendChild(elt("div", "\u00a0", "CodeMirror-cursor CodeMirror-secondarycursor"));
3195        otherCursor.style.display = "";
3196        otherCursor.style.left = pos.other.left + "px";
3197        otherCursor.style.top = pos.other.top + "px";
3198        otherCursor.style.height = (pos.other.bottom - pos.other.top) * .85 + "px";
3199      }
3200    }
3201  
3202    function cmpCoords(a, b) { return a.top - b.top || a.left - b.left }
3203  
3204    // Draws the given range as a highlighted selection
3205    function drawSelectionRange(cm, range, output) {
3206      var display = cm.display, doc = cm.doc;
3207      var fragment = document.createDocumentFragment();
3208      var padding = paddingH(cm.display), leftSide = padding.left;
3209      var rightSide = Math.max(display.sizerWidth, displayWidth(cm) - display.sizer.offsetLeft) - padding.right;
3210      var docLTR = doc.direction == "ltr";
3211  
3212      function add(left, top, width, bottom) {
3213        if (top < 0) { top = 0; }
3214        top = Math.round(top);
3215        bottom = Math.round(bottom);
3216        fragment.appendChild(elt("div", null, "CodeMirror-selected", ("position: absolute; left: " + left + "px;\n                             top: " + top + "px; width: " + (width == null ? rightSide - left : width) + "px;\n                             height: " + (bottom - top) + "px")));
3217      }
3218  
3219      function drawForLine(line, fromArg, toArg) {
3220        var lineObj = getLine(doc, line);
3221        var lineLen = lineObj.text.length;
3222        var start, end;
3223        function coords(ch, bias) {
3224          return charCoords(cm, Pos(line, ch), "div", lineObj, bias)
3225        }
3226  
3227        function wrapX(pos, dir, side) {
3228          var extent = wrappedLineExtentChar(cm, lineObj, null, pos);
3229          var prop = (dir == "ltr") == (side == "after") ? "left" : "right";
3230          var ch = side == "after" ? extent.begin : extent.end - (/\s/.test(lineObj.text.charAt(extent.end - 1)) ? 2 : 1);
3231          return coords(ch, prop)[prop]
3232        }
3233  
3234        var order = getOrder(lineObj, doc.direction);
3235        iterateBidiSections(order, fromArg || 0, toArg == null ? lineLen : toArg, function (from, to, dir, i) {
3236          var ltr = dir == "ltr";
3237          var fromPos = coords(from, ltr ? "left" : "right");
3238          var toPos = coords(to - 1, ltr ? "right" : "left");
3239  
3240          var openStart = fromArg == null && from == 0, openEnd = toArg == null && to == lineLen;
3241          var first = i == 0, last = !order || i == order.length - 1;
3242          if (toPos.top - fromPos.top <= 3) { // Single line
3243            var openLeft = (docLTR ? openStart : openEnd) && first;
3244            var openRight = (docLTR ? openEnd : openStart) && last;
3245            var left = openLeft ? leftSide : (ltr ? fromPos : toPos).left;
3246            var right = openRight ? rightSide : (ltr ? toPos : fromPos).right;
3247            add(left, fromPos.top, right - left, fromPos.bottom);
3248          } else { // Multiple lines
3249            var topLeft, topRight, botLeft, botRight;
3250            if (ltr) {
3251              topLeft = docLTR && openStart && first ? leftSide : fromPos.left;
3252              topRight = docLTR ? rightSide : wrapX(from, dir, "before");
3253              botLeft = docLTR ? leftSide : wrapX(to, dir, "after");
3254              botRight = docLTR && openEnd && last ? rightSide : toPos.right;
3255            } else {
3256              topLeft = !docLTR ? leftSide : wrapX(from, dir, "before");
3257              topRight = !docLTR && openStart && first ? rightSide : fromPos.right;
3258              botLeft = !docLTR && openEnd && last ? leftSide : toPos.left;
3259              botRight = !docLTR ? rightSide : wrapX(to, dir, "after");
3260            }
3261            add(topLeft, fromPos.top, topRight - topLeft, fromPos.bottom);
3262            if (fromPos.bottom < toPos.top) { add(leftSide, fromPos.bottom, null, toPos.top); }
3263            add(botLeft, toPos.top, botRight - botLeft, toPos.bottom);
3264          }
3265  
3266          if (!start || cmpCoords(fromPos, start) < 0) { start = fromPos; }
3267          if (cmpCoords(toPos, start) < 0) { start = toPos; }
3268          if (!end || cmpCoords(fromPos, end) < 0) { end = fromPos; }
3269          if (cmpCoords(toPos, end) < 0) { end = toPos; }
3270        });
3271        return {start: start, end: end}
3272      }
3273  
3274      var sFrom = range.from(), sTo = range.to();
3275      if (sFrom.line == sTo.line) {
3276        drawForLine(sFrom.line, sFrom.ch, sTo.ch);
3277      } else {
3278        var fromLine = getLine(doc, sFrom.line), toLine = getLine(doc, sTo.line);
3279        var singleVLine = visualLine(fromLine) == visualLine(toLine);
3280        var leftEnd = drawForLine(sFrom.line, sFrom.ch, singleVLine ? fromLine.text.length + 1 : null).end;
3281        var rightStart = drawForLine(sTo.line, singleVLine ? 0 : null, sTo.ch).start;
3282        if (singleVLine) {
3283          if (leftEnd.top < rightStart.top - 2) {
3284            add(leftEnd.right, leftEnd.top, null, leftEnd.bottom);
3285            add(leftSide, rightStart.top, rightStart.left, rightStart.bottom);
3286          } else {
3287            add(leftEnd.right, leftEnd.top, rightStart.left - leftEnd.right, leftEnd.bottom);
3288          }
3289        }
3290        if (leftEnd.bottom < rightStart.top)
3291          { add(leftSide, leftEnd.bottom, null, rightStart.top); }
3292      }
3293  
3294      output.appendChild(fragment);
3295    }
3296  
3297    // Cursor-blinking
3298    function restartBlink(cm) {
3299      if (!cm.state.focused) { return }
3300      var display = cm.display;
3301      clearInterval(display.blinker);
3302      var on = true;
3303      display.cursorDiv.style.visibility = "";
3304      if (cm.options.cursorBlinkRate > 0)
3305        { display.blinker = setInterval(function () {
3306          if (!cm.hasFocus()) { onBlur(cm); }
3307          display.cursorDiv.style.visibility = (on = !on) ? "" : "hidden";
3308        }, cm.options.cursorBlinkRate); }
3309      else if (cm.options.cursorBlinkRate < 0)
3310        { display.cursorDiv.style.visibility = "hidden"; }
3311    }
3312  
3313    function ensureFocus(cm) {
3314      if (!cm.hasFocus()) {
3315        cm.display.input.focus();
3316        if (!cm.state.focused) { onFocus(cm); }
3317      }
3318    }
3319  
3320    function delayBlurEvent(cm) {
3321      cm.state.delayingBlurEvent = true;
3322      setTimeout(function () { if (cm.state.delayingBlurEvent) {
3323        cm.state.delayingBlurEvent = false;
3324        if (cm.state.focused) { onBlur(cm); }
3325      } }, 100);
3326    }
3327  
3328    function onFocus(cm, e) {
3329      if (cm.state.delayingBlurEvent && !cm.state.draggingText) { cm.state.delayingBlurEvent = false; }
3330  
3331      if (cm.options.readOnly == "nocursor") { return }
3332      if (!cm.state.focused) {
3333        signal(cm, "focus", cm, e);
3334        cm.state.focused = true;
3335        addClass(cm.display.wrapper, "CodeMirror-focused");
3336        // This test prevents this from firing when a context
3337        // menu is closed (since the input reset would kill the
3338        // select-all detection hack)
3339        if (!cm.curOp && cm.display.selForContextMenu != cm.doc.sel) {
3340          cm.display.input.reset();
3341          if (webkit) { setTimeout(function () { return cm.display.input.reset(true); }, 20); } // Issue #1730
3342        }
3343        cm.display.input.receivedFocus();
3344      }
3345      restartBlink(cm);
3346    }
3347    function onBlur(cm, e) {
3348      if (cm.state.delayingBlurEvent) { return }
3349  
3350      if (cm.state.focused) {
3351        signal(cm, "blur", cm, e);
3352        cm.state.focused = false;
3353        rmClass(cm.display.wrapper, "CodeMirror-focused");
3354      }
3355      clearInterval(cm.display.blinker);
3356      setTimeout(function () { if (!cm.state.focused) { cm.display.shift = false; } }, 150);
3357    }
3358  
3359    // Read the actual heights of the rendered lines, and update their
3360    // stored heights to match.
3361    function updateHeightsInViewport(cm) {
3362      var display = cm.display;
3363      var prevBottom = display.lineDiv.offsetTop;
3364      var viewTop = Math.max(0, display.scroller.getBoundingClientRect().top);
3365      var oldHeight = display.lineDiv.getBoundingClientRect().top;
3366      var mustScroll = 0;
3367      for (var i = 0; i < display.view.length; i++) {
3368        var cur = display.view[i], wrapping = cm.options.lineWrapping;
3369        var height = (void 0), width = 0;
3370        if (cur.hidden) { continue }
3371        oldHeight += cur.line.height;
3372        if (ie && ie_version < 8) {
3373          var bot = cur.node.offsetTop + cur.node.offsetHeight;
3374          height = bot - prevBottom;
3375          prevBottom = bot;
3376        } else {
3377          var box = cur.node.getBoundingClientRect();
3378          height = box.bottom - box.top;
3379          // Check that lines don't extend past the right of the current
3380          // editor width
3381          if (!wrapping && cur.text.firstChild)
3382            { width = cur.text.firstChild.getBoundingClientRect().right - box.left - 1; }
3383        }
3384        var diff = cur.line.height - height;
3385        if (diff > .005 || diff < -.005) {
3386          if (oldHeight < viewTop) { mustScroll -= diff; }
3387          updateLineHeight(cur.line, height);
3388          updateWidgetHeight(cur.line);
3389          if (cur.rest) { for (var j = 0; j < cur.rest.length; j++)
3390            { updateWidgetHeight(cur.rest[j]); } }
3391        }
3392        if (width > cm.display.sizerWidth) {
3393          var chWidth = Math.ceil(width / charWidth(cm.display));
3394          if (chWidth > cm.display.maxLineLength) {
3395            cm.display.maxLineLength = chWidth;
3396            cm.display.maxLine = cur.line;
3397            cm.display.maxLineChanged = true;
3398          }
3399        }
3400      }
3401      if (Math.abs(mustScroll) > 2) { display.scroller.scrollTop += mustScroll; }
3402    }
3403  
3404    // Read and store the height of line widgets associated with the
3405    // given line.
3406    function updateWidgetHeight(line) {
3407      if (line.widgets) { for (var i = 0; i < line.widgets.length; ++i) {
3408        var w = line.widgets[i], parent = w.node.parentNode;
3409        if (parent) { w.height = parent.offsetHeight; }
3410      } }
3411    }
3412  
3413    // Compute the lines that are visible in a given viewport (defaults
3414    // the the current scroll position). viewport may contain top,
3415    // height, and ensure (see op.scrollToPos) properties.
3416    function visibleLines(display, doc, viewport) {
3417      var top = viewport && viewport.top != null ? Math.max(0, viewport.top) : display.scroller.scrollTop;
3418      top = Math.floor(top - paddingTop(display));
3419      var bottom = viewport && viewport.bottom != null ? viewport.bottom : top + display.wrapper.clientHeight;
3420  
3421      var from = lineAtHeight(doc, top), to = lineAtHeight(doc, bottom);
3422      // Ensure is a {from: {line, ch}, to: {line, ch}} object, and
3423      // forces those lines into the viewport (if possible).
3424      if (viewport && viewport.ensure) {
3425        var ensureFrom = viewport.ensure.from.line, ensureTo = viewport.ensure.to.line;
3426        if (ensureFrom < from) {
3427          from = ensureFrom;
3428          to = lineAtHeight(doc, heightAtLine(getLine(doc, ensureFrom)) + display.wrapper.clientHeight);
3429        } else if (Math.min(ensureTo, doc.lastLine()) >= to) {
3430          from = lineAtHeight(doc, heightAtLine(getLine(doc, ensureTo)) - display.wrapper.clientHeight);
3431          to = ensureTo;
3432        }
3433      }
3434      return {from: from, to: Math.max(to, from + 1)}
3435    }
3436  
3437    // SCROLLING THINGS INTO VIEW
3438  
3439    // If an editor sits on the top or bottom of the window, partially
3440    // scrolled out of view, this ensures that the cursor is visible.
3441    function maybeScrollWindow(cm, rect) {
3442      if (signalDOMEvent(cm, "scrollCursorIntoView")) { return }
3443  
3444      var display = cm.display, box = display.sizer.getBoundingClientRect(), doScroll = null;
3445      if (rect.top + box.top < 0) { doScroll = true; }
3446      else if (rect.bottom + box.top > (window.innerHeight || document.documentElement.clientHeight)) { doScroll = false; }
3447      if (doScroll != null && !phantom) {
3448        var scrollNode = elt("div", "\u200b", null, ("position: absolute;\n                         top: " + (rect.top - display.viewOffset - paddingTop(cm.display)) + "px;\n                         height: " + (rect.bottom - rect.top + scrollGap(cm) + display.barHeight) + "px;\n                         left: " + (rect.left) + "px; width: " + (Math.max(2, rect.right - rect.left)) + "px;"));
3449        cm.display.lineSpace.appendChild(scrollNode);
3450        scrollNode.scrollIntoView(doScroll);
3451        cm.display.lineSpace.removeChild(scrollNode);
3452      }
3453    }
3454  
3455    // Scroll a given position into view (immediately), verifying that
3456    // it actually became visible (as line heights are accurately
3457    // measured, the position of something may 'drift' during drawing).
3458    function scrollPosIntoView(cm, pos, end, margin) {
3459      if (margin == null) { margin = 0; }
3460      var rect;
3461      if (!cm.options.lineWrapping && pos == end) {
3462        // Set pos and end to the cursor positions around the character pos sticks to
3463        // If pos.sticky == "before", that is around pos.ch - 1, otherwise around pos.ch
3464        // If pos == Pos(_, 0, "before"), pos and end are unchanged
3465        end = pos.sticky == "before" ? Pos(pos.line, pos.ch + 1, "before") : pos;
3466        pos = pos.ch ? Pos(pos.line, pos.sticky == "before" ? pos.ch - 1 : pos.ch, "after") : pos;
3467      }
3468      for (var limit = 0; limit < 5; limit++) {
3469        var changed = false;
3470        var coords = cursorCoords(cm, pos);
3471        var endCoords = !end || end == pos ? coords : cursorCoords(cm, end);
3472        rect = {left: Math.min(coords.left, endCoords.left),
3473                top: Math.min(coords.top, endCoords.top) - margin,
3474                right: Math.max(coords.left, endCoords.left),
3475                bottom: Math.max(coords.bottom, endCoords.bottom) + margin};
3476        var scrollPos = calculateScrollPos(cm, rect);
3477        var startTop = cm.doc.scrollTop, startLeft = cm.doc.scrollLeft;
3478        if (scrollPos.scrollTop != null) {
3479          updateScrollTop(cm, scrollPos.scrollTop);
3480          if (Math.abs(cm.doc.scrollTop - startTop) > 1) { changed = true; }
3481        }
3482        if (scrollPos.scrollLeft != null) {
3483          setScrollLeft(cm, scrollPos.scrollLeft);
3484          if (Math.abs(cm.doc.scrollLeft - startLeft) > 1) { changed = true; }
3485        }
3486        if (!changed) { break }
3487      }
3488      return rect
3489    }
3490  
3491    // Scroll a given set of coordinates into view (immediately).
3492    function scrollIntoView(cm, rect) {
3493      var scrollPos = calculateScrollPos(cm, rect);
3494      if (scrollPos.scrollTop != null) { updateScrollTop(cm, scrollPos.scrollTop); }
3495      if (scrollPos.scrollLeft != null) { setScrollLeft(cm, scrollPos.scrollLeft); }
3496    }
3497  
3498    // Calculate a new scroll position needed to scroll the given
3499    // rectangle into view. Returns an object with scrollTop and
3500    // scrollLeft properties. When these are undefined, the
3501    // vertical/horizontal position does not need to be adjusted.
3502    function calculateScrollPos(cm, rect) {
3503      var display = cm.display, snapMargin = textHeight(cm.display);
3504      if (rect.top < 0) { rect.top = 0; }
3505      var screentop = cm.curOp && cm.curOp.scrollTop != null ? cm.curOp.scrollTop : display.scroller.scrollTop;
3506      var screen = displayHeight(cm), result = {};
3507      if (rect.bottom - rect.top > screen) { rect.bottom = rect.top + screen; }
3508      var docBottom = cm.doc.height + paddingVert(display);
3509      var atTop = rect.top < snapMargin, atBottom = rect.bottom > docBottom - snapMargin;
3510      if (rect.top < screentop) {
3511        result.scrollTop = atTop ? 0 : rect.top;
3512      } else if (rect.bottom > screentop + screen) {
3513        var newTop = Math.min(rect.top, (atBottom ? docBottom : rect.bottom) - screen);
3514        if (newTop != screentop) { result.scrollTop = newTop; }
3515      }
3516  
3517      var gutterSpace = cm.options.fixedGutter ? 0 : display.gutters.offsetWidth;
3518      var screenleft = cm.curOp && cm.curOp.scrollLeft != null ? cm.curOp.scrollLeft : display.scroller.scrollLeft - gutterSpace;
3519      var screenw = displayWidth(cm) - display.gutters.offsetWidth;
3520      var tooWide = rect.right - rect.left > screenw;
3521      if (tooWide) { rect.right = rect.left + screenw; }
3522      if (rect.left < 10)
3523        { result.scrollLeft = 0; }
3524      else if (rect.left < screenleft)
3525        { result.scrollLeft = Math.max(0, rect.left + gutterSpace - (tooWide ? 0 : 10)); }
3526      else if (rect.right > screenw + screenleft - 3)
3527        { result.scrollLeft = rect.right + (tooWide ? 0 : 10) - screenw; }
3528      return result
3529    }
3530  
3531    // Store a relative adjustment to the scroll position in the current
3532    // operation (to be applied when the operation finishes).
3533    function addToScrollTop(cm, top) {
3534      if (top == null) { return }
3535      resolveScrollToPos(cm);
3536      cm.curOp.scrollTop = (cm.curOp.scrollTop == null ? cm.doc.scrollTop : cm.curOp.scrollTop) + top;
3537    }
3538  
3539    // Make sure that at the end of the operation the current cursor is
3540    // shown.
3541    function ensureCursorVisible(cm) {
3542      resolveScrollToPos(cm);
3543      var cur = cm.getCursor();
3544      cm.curOp.scrollToPos = {from: cur, to: cur, margin: cm.options.cursorScrollMargin};
3545    }
3546  
3547    function scrollToCoords(cm, x, y) {
3548      if (x != null || y != null) { resolveScrollToPos(cm); }
3549      if (x != null) { cm.curOp.scrollLeft = x; }
3550      if (y != null) { cm.curOp.scrollTop = y; }
3551    }
3552  
3553    function scrollToRange(cm, range) {
3554      resolveScrollToPos(cm);
3555      cm.curOp.scrollToPos = range;
3556    }
3557  
3558    // When an operation has its scrollToPos property set, and another
3559    // scroll action is applied before the end of the operation, this
3560    // 'simulates' scrolling that position into view in a cheap way, so
3561    // that the effect of intermediate scroll commands is not ignored.
3562    function resolveScrollToPos(cm) {
3563      var range = cm.curOp.scrollToPos;
3564      if (range) {
3565        cm.curOp.scrollToPos = null;
3566        var from = estimateCoords(cm, range.from), to = estimateCoords(cm, range.to);
3567        scrollToCoordsRange(cm, from, to, range.margin);
3568      }
3569    }
3570  
3571    function scrollToCoordsRange(cm, from, to, margin) {
3572      var sPos = calculateScrollPos(cm, {
3573        left: Math.min(from.left, to.left),
3574        top: Math.min(from.top, to.top) - margin,
3575        right: Math.max(from.right, to.right),
3576        bottom: Math.max(from.bottom, to.bottom) + margin
3577      });
3578      scrollToCoords(cm, sPos.scrollLeft, sPos.scrollTop);
3579    }
3580  
3581    // Sync the scrollable area and scrollbars, ensure the viewport
3582    // covers the visible area.
3583    function updateScrollTop(cm, val) {
3584      if (Math.abs(cm.doc.scrollTop - val) < 2) { return }
3585      if (!gecko) { updateDisplaySimple(cm, {top: val}); }
3586      setScrollTop(cm, val, true);
3587      if (gecko) { updateDisplaySimple(cm); }
3588      startWorker(cm, 100);
3589    }
3590  
3591    function setScrollTop(cm, val, forceScroll) {
3592      val = Math.max(0, Math.min(cm.display.scroller.scrollHeight - cm.display.scroller.clientHeight, val));
3593      if (cm.display.scroller.scrollTop == val && !forceScroll) { return }
3594      cm.doc.scrollTop = val;
3595      cm.display.scrollbars.setScrollTop(val);
3596      if (cm.display.scroller.scrollTop != val) { cm.display.scroller.scrollTop = val; }
3597    }
3598  
3599    // Sync scroller and scrollbar, ensure the gutter elements are
3600    // aligned.
3601    function setScrollLeft(cm, val, isScroller, forceScroll) {
3602      val = Math.max(0, Math.min(val, cm.display.scroller.scrollWidth - cm.display.scroller.clientWidth));
3603      if ((isScroller ? val == cm.doc.scrollLeft : Math.abs(cm.doc.scrollLeft - val) < 2) && !forceScroll) { return }
3604      cm.doc.scrollLeft = val;
3605      alignHorizontally(cm);
3606      if (cm.display.scroller.scrollLeft != val) { cm.display.scroller.scrollLeft = val; }
3607      cm.display.scrollbars.setScrollLeft(val);
3608    }
3609  
3610    // SCROLLBARS
3611  
3612    // Prepare DOM reads needed to update the scrollbars. Done in one
3613    // shot to minimize update/measure roundtrips.
3614    function measureForScrollbars(cm) {
3615      var d = cm.display, gutterW = d.gutters.offsetWidth;
3616      var docH = Math.round(cm.doc.height + paddingVert(cm.display));
3617      return {
3618        clientHeight: d.scroller.clientHeight,
3619        viewHeight: d.wrapper.clientHeight,
3620        scrollWidth: d.scroller.scrollWidth, clientWidth: d.scroller.clientWidth,
3621        viewWidth: d.wrapper.clientWidth,
3622        barLeft: cm.options.fixedGutter ? gutterW : 0,
3623        docHeight: docH,
3624        scrollHeight: docH + scrollGap(cm) + d.barHeight,
3625        nativeBarWidth: d.nativeBarWidth,
3626        gutterWidth: gutterW
3627      }
3628    }
3629  
3630    var NativeScrollbars = function(place, scroll, cm) {
3631      this.cm = cm;
3632      var vert = this.vert = elt("div", [elt("div", null, null, "min-width: 1px")], "CodeMirror-vscrollbar");
3633      var horiz = this.horiz = elt("div", [elt("div", null, null, "height: 100%; min-height: 1px")], "CodeMirror-hscrollbar");
3634      vert.tabIndex = horiz.tabIndex = -1;
3635      place(vert); place(horiz);
3636  
3637      on(vert, "scroll", function () {
3638        if (vert.clientHeight) { scroll(vert.scrollTop, "vertical"); }
3639      });
3640      on(horiz, "scroll", function () {
3641        if (horiz.clientWidth) { scroll(horiz.scrollLeft, "horizontal"); }
3642      });
3643  
3644      this.checkedZeroWidth = false;
3645      // Need to set a minimum width to see the scrollbar on IE7 (but must not set it on IE8).
3646      if (ie && ie_version < 8) { this.horiz.style.minHeight = this.vert.style.minWidth = "18px"; }
3647    };
3648  
3649    NativeScrollbars.prototype.update = function (measure) {
3650      var needsH = measure.scrollWidth > measure.clientWidth + 1;
3651      var needsV = measure.scrollHeight > measure.clientHeight + 1;
3652      var sWidth = measure.nativeBarWidth;
3653  
3654      if (needsV) {
3655        this.vert.style.display = "block";
3656        this.vert.style.bottom = needsH ? sWidth + "px" : "0";
3657        var totalHeight = measure.viewHeight - (needsH ? sWidth : 0);
3658        // A bug in IE8 can cause this value to be negative, so guard it.
3659        this.vert.firstChild.style.height =
3660          Math.max(0, measure.scrollHeight - measure.clientHeight + totalHeight) + "px";
3661      } else {
3662        this.vert.scrollTop = 0;
3663        this.vert.style.display = "";
3664        this.vert.firstChild.style.height = "0";
3665      }
3666  
3667      if (needsH) {
3668        this.horiz.style.display = "block";
3669        this.horiz.style.right = needsV ? sWidth + "px" : "0";
3670        this.horiz.style.left = measure.barLeft + "px";
3671        var totalWidth = measure.viewWidth - measure.barLeft - (needsV ? sWidth : 0);
3672        this.horiz.firstChild.style.width =
3673          Math.max(0, measure.scrollWidth - measure.clientWidth + totalWidth) + "px";
3674      } else {
3675        this.horiz.style.display = "";
3676        this.horiz.firstChild.style.width = "0";
3677      }
3678  
3679      if (!this.checkedZeroWidth && measure.clientHeight > 0) {
3680        if (sWidth == 0) { this.zeroWidthHack(); }
3681        this.checkedZeroWidth = true;
3682      }
3683  
3684      return {right: needsV ? sWidth : 0, bottom: needsH ? sWidth : 0}
3685    };
3686  
3687    NativeScrollbars.prototype.setScrollLeft = function (pos) {
3688      if (this.horiz.scrollLeft != pos) { this.horiz.scrollLeft = pos; }
3689      if (this.disableHoriz) { this.enableZeroWidthBar(this.horiz, this.disableHoriz, "horiz"); }
3690    };
3691  
3692    NativeScrollbars.prototype.setScrollTop = function (pos) {
3693      if (this.vert.scrollTop != pos) { this.vert.scrollTop = pos; }
3694      if (this.disableVert) { this.enableZeroWidthBar(this.vert, this.disableVert, "vert"); }
3695    };
3696  
3697    NativeScrollbars.prototype.zeroWidthHack = function () {
3698      var w = mac && !mac_geMountainLion ? "12px" : "18px";
3699      this.horiz.style.height = this.vert.style.width = w;
3700      this.horiz.style.visibility = this.vert.style.visibility = "hidden";
3701      this.disableHoriz = new Delayed;
3702      this.disableVert = new Delayed;
3703    };
3704  
3705    NativeScrollbars.prototype.enableZeroWidthBar = function (bar, delay, type) {
3706      bar.style.visibility = "";
3707      function maybeDisable() {
3708        // To find out whether the scrollbar is still visible, we
3709        // check whether the element under the pixel in the bottom
3710        // right corner of the scrollbar box is the scrollbar box
3711        // itself (when the bar is still visible) or its filler child
3712        // (when the bar is hidden). If it is still visible, we keep
3713        // it enabled, if it's hidden, we disable pointer events.
3714        var box = bar.getBoundingClientRect();
3715        var elt = type == "vert" ? document.elementFromPoint(box.right - 1, (box.top + box.bottom) / 2)
3716            : document.elementFromPoint((box.right + box.left) / 2, box.bottom - 1);
3717        if (elt != bar) { bar.style.visibility = "hidden"; }
3718        else { delay.set(1000, maybeDisable); }
3719      }
3720      delay.set(1000, maybeDisable);
3721    };
3722  
3723    NativeScrollbars.prototype.clear = function () {
3724      var parent = this.horiz.parentNode;
3725      parent.removeChild(this.horiz);
3726      parent.removeChild(this.vert);
3727    };
3728  
3729    var NullScrollbars = function () {};
3730  
3731    NullScrollbars.prototype.update = function () { return {bottom: 0, right: 0} };
3732    NullScrollbars.prototype.setScrollLeft = function () {};
3733    NullScrollbars.prototype.setScrollTop = function () {};
3734    NullScrollbars.prototype.clear = function () {};
3735  
3736    function updateScrollbars(cm, measure) {
3737      if (!measure) { measure = measureForScrollbars(cm); }
3738      var startWidth = cm.display.barWidth, startHeight = cm.display.barHeight;
3739      updateScrollbarsInner(cm, measure);
3740      for (var i = 0; i < 4 && startWidth != cm.display.barWidth || startHeight != cm.display.barHeight; i++) {
3741        if (startWidth != cm.display.barWidth && cm.options.lineWrapping)
3742          { updateHeightsInViewport(cm); }
3743        updateScrollbarsInner(cm, measureForScrollbars(cm));
3744        startWidth = cm.display.barWidth; startHeight = cm.display.barHeight;
3745      }
3746    }
3747  
3748    // Re-synchronize the fake scrollbars with the actual size of the
3749    // content.
3750    function updateScrollbarsInner(cm, measure) {
3751      var d = cm.display;
3752      var sizes = d.scrollbars.update(measure);
3753  
3754      d.sizer.style.paddingRight = (d.barWidth = sizes.right) + "px";
3755      d.sizer.style.paddingBottom = (d.barHeight = sizes.bottom) + "px";
3756      d.heightForcer.style.borderBottom = sizes.bottom + "px solid transparent";
3757  
3758      if (sizes.right && sizes.bottom) {
3759        d.scrollbarFiller.style.display = "block";
3760        d.scrollbarFiller.style.height = sizes.bottom + "px";
3761        d.scrollbarFiller.style.width = sizes.right + "px";
3762      } else { d.scrollbarFiller.style.display = ""; }
3763      if (sizes.bottom && cm.options.coverGutterNextToScrollbar && cm.options.fixedGutter) {
3764        d.gutterFiller.style.display = "block";
3765        d.gutterFiller.style.height = sizes.bottom + "px";
3766        d.gutterFiller.style.width = measure.gutterWidth + "px";
3767      } else { d.gutterFiller.style.display = ""; }
3768    }
3769  
3770    var scrollbarModel = {"native": NativeScrollbars, "null": NullScrollbars};
3771  
3772    function initScrollbars(cm) {
3773      if (cm.display.scrollbars) {
3774        cm.display.scrollbars.clear();
3775        if (cm.display.scrollbars.addClass)
3776          { rmClass(cm.display.wrapper, cm.display.scrollbars.addClass); }
3777      }
3778  
3779      cm.display.scrollbars = new scrollbarModel[cm.options.scrollbarStyle](function (node) {
3780        cm.display.wrapper.insertBefore(node, cm.display.scrollbarFiller);
3781        // Prevent clicks in the scrollbars from killing focus
3782        on(node, "mousedown", function () {
3783          if (cm.state.focused) { setTimeout(function () { return cm.display.input.focus(); }, 0); }
3784        });
3785        node.setAttribute("cm-not-content", "true");
3786      }, function (pos, axis) {
3787        if (axis == "horizontal") { setScrollLeft(cm, pos); }
3788        else { updateScrollTop(cm, pos); }
3789      }, cm);
3790      if (cm.display.scrollbars.addClass)
3791        { addClass(cm.display.wrapper, cm.display.scrollbars.addClass); }
3792    }
3793  
3794    // Operations are used to wrap a series of changes to the editor
3795    // state in such a way that each change won't have to update the
3796    // cursor and display (which would be awkward, slow, and
3797    // error-prone). Instead, display updates are batched and then all
3798    // combined and executed at once.
3799  
3800    var nextOpId = 0;
3801    // Start a new operation.
3802    function startOperation(cm) {
3803      cm.curOp = {
3804        cm: cm,
3805        viewChanged: false,      // Flag that indicates that lines might need to be redrawn
3806        startHeight: cm.doc.height, // Used to detect need to update scrollbar
3807        forceUpdate: false,      // Used to force a redraw
3808        updateInput: 0,       // Whether to reset the input textarea
3809        typing: false,           // Whether this reset should be careful to leave existing text (for compositing)
3810        changeObjs: null,        // Accumulated changes, for firing change events
3811        cursorActivityHandlers: null, // Set of handlers to fire cursorActivity on
3812        cursorActivityCalled: 0, // Tracks which cursorActivity handlers have been called already
3813        selectionChanged: false, // Whether the selection needs to be redrawn
3814        updateMaxLine: false,    // Set when the widest line needs to be determined anew
3815        scrollLeft: null, scrollTop: null, // Intermediate scroll position, not pushed to DOM yet
3816        scrollToPos: null,       // Used to scroll to a specific position
3817        focus: false,
3818        id: ++nextOpId,          // Unique ID
3819        markArrays: null         // Used by addMarkedSpan
3820      };
3821      pushOperation(cm.curOp);
3822    }
3823  
3824    // Finish an operation, updating the display and signalling delayed events
3825    function endOperation(cm) {
3826      var op = cm.curOp;
3827      if (op) { finishOperation(op, function (group) {
3828        for (var i = 0; i < group.ops.length; i++)
3829          { group.ops[i].cm.curOp = null; }
3830        endOperations(group);
3831      }); }
3832    }
3833  
3834    // The DOM updates done when an operation finishes are batched so
3835    // that the minimum number of relayouts are required.
3836    function endOperations(group) {
3837      var ops = group.ops;
3838      for (var i = 0; i < ops.length; i++) // Read DOM
3839        { endOperation_R1(ops[i]); }
3840      for (var i$1 = 0; i$1 < ops.length; i$1++) // Write DOM (maybe)
3841        { endOperation_W1(ops[i$1]); }
3842      for (var i$2 = 0; i$2 < ops.length; i$2++) // Read DOM
3843        { endOperation_R2(ops[i$2]); }
3844      for (var i$3 = 0; i$3 < ops.length; i$3++) // Write DOM (maybe)
3845        { endOperation_W2(ops[i$3]); }
3846      for (var i$4 = 0; i$4 < ops.length; i$4++) // Read DOM
3847        { endOperation_finish(ops[i$4]); }
3848    }
3849  
3850    function endOperation_R1(op) {
3851      var cm = op.cm, display = cm.display;
3852      maybeClipScrollbars(cm);
3853      if (op.updateMaxLine) { findMaxLine(cm); }
3854  
3855      op.mustUpdate = op.viewChanged || op.forceUpdate || op.scrollTop != null ||
3856        op.scrollToPos && (op.scrollToPos.from.line < display.viewFrom ||
3857                           op.scrollToPos.to.line >= display.viewTo) ||
3858        display.maxLineChanged && cm.options.lineWrapping;
3859      op.update = op.mustUpdate &&
3860        new DisplayUpdate(cm, op.mustUpdate && {top: op.scrollTop, ensure: op.scrollToPos}, op.forceUpdate);
3861    }
3862  
3863    function endOperation_W1(op) {
3864      op.updatedDisplay = op.mustUpdate && updateDisplayIfNeeded(op.cm, op.update);
3865    }
3866  
3867    function endOperation_R2(op) {
3868      var cm = op.cm, display = cm.display;
3869      if (op.updatedDisplay) { updateHeightsInViewport(cm); }
3870  
3871      op.barMeasure = measureForScrollbars(cm);
3872  
3873      // If the max line changed since it was last measured, measure it,
3874      // and ensure the document's width matches it.
3875      // updateDisplay_W2 will use these properties to do the actual resizing
3876      if (display.maxLineChanged && !cm.options.lineWrapping) {
3877        op.adjustWidthTo = measureChar(cm, display.maxLine, display.maxLine.text.length).left + 3;
3878        cm.display.sizerWidth = op.adjustWidthTo;
3879        op.barMeasure.scrollWidth =
3880          Math.max(display.scroller.clientWidth, display.sizer.offsetLeft + op.adjustWidthTo + scrollGap(cm) + cm.display.barWidth);
3881        op.maxScrollLeft = Math.max(0, display.sizer.offsetLeft + op.adjustWidthTo - displayWidth(cm));
3882      }
3883  
3884      if (op.updatedDisplay || op.selectionChanged)
3885        { op.preparedSelection = display.input.prepareSelection(); }
3886    }
3887  
3888    function endOperation_W2(op) {
3889      var cm = op.cm;
3890  
3891      if (op.adjustWidthTo != null) {
3892        cm.display.sizer.style.minWidth = op.adjustWidthTo + "px";
3893        if (op.maxScrollLeft < cm.doc.scrollLeft)
3894          { setScrollLeft(cm, Math.min(cm.display.scroller.scrollLeft, op.maxScrollLeft), true); }
3895        cm.display.maxLineChanged = false;
3896      }
3897  
3898      var takeFocus = op.focus && op.focus == activeElt();
3899      if (op.preparedSelection)
3900        { cm.display.input.showSelection(op.preparedSelection, takeFocus); }
3901      if (op.updatedDisplay || op.startHeight != cm.doc.height)
3902        { updateScrollbars(cm, op.barMeasure); }
3903      if (op.updatedDisplay)
3904        { setDocumentHeight(cm, op.barMeasure); }
3905  
3906      if (op.selectionChanged) { restartBlink(cm); }
3907  
3908      if (cm.state.focused && op.updateInput)
3909        { cm.display.input.reset(op.typing); }
3910      if (takeFocus) { ensureFocus(op.cm); }
3911    }
3912  
3913    function endOperation_finish(op) {
3914      var cm = op.cm, display = cm.display, doc = cm.doc;
3915  
3916      if (op.updatedDisplay) { postUpdateDisplay(cm, op.update); }
3917  
3918      // Abort mouse wheel delta measurement, when scrolling explicitly
3919      if (display.wheelStartX != null && (op.scrollTop != null || op.scrollLeft != null || op.scrollToPos))
3920        { display.wheelStartX = display.wheelStartY = null; }
3921  
3922      // Propagate the scroll position to the actual DOM scroller
3923      if (op.scrollTop != null) { setScrollTop(cm, op.scrollTop, op.forceScroll); }
3924  
3925      if (op.scrollLeft != null) { setScrollLeft(cm, op.scrollLeft, true, true); }
3926      // If we need to scroll a specific position into view, do so.
3927      if (op.scrollToPos) {
3928        var rect = scrollPosIntoView(cm, clipPos(doc, op.scrollToPos.from),
3929                                     clipPos(doc, op.scrollToPos.to), op.scrollToPos.margin);
3930        maybeScrollWindow(cm, rect);
3931      }
3932  
3933      // Fire events for markers that are hidden/unidden by editing or
3934      // undoing
3935      var hidden = op.maybeHiddenMarkers, unhidden = op.maybeUnhiddenMarkers;
3936      if (hidden) { for (var i = 0; i < hidden.length; ++i)
3937        { if (!hidden[i].lines.length) { signal(hidden[i], "hide"); } } }
3938      if (unhidden) { for (var i$1 = 0; i$1 < unhidden.length; ++i$1)
3939        { if (unhidden[i$1].lines.length) { signal(unhidden[i$1], "unhide"); } } }
3940  
3941      if (display.wrapper.offsetHeight)
3942        { doc.scrollTop = cm.display.scroller.scrollTop; }
3943  
3944      // Fire change events, and delayed event handlers
3945      if (op.changeObjs)
3946        { signal(cm, "changes", cm, op.changeObjs); }
3947      if (op.update)
3948        { op.update.finish(); }
3949    }
3950  
3951    // Run the given function in an operation
3952    function runInOp(cm, f) {
3953      if (cm.curOp) { return f() }
3954      startOperation(cm);
3955      try { return f() }
3956      finally { endOperation(cm); }
3957    }
3958    // Wraps a function in an operation. Returns the wrapped function.
3959    function operation(cm, f) {
3960      return function() {
3961        if (cm.curOp) { return f.apply(cm, arguments) }
3962        startOperation(cm);
3963        try { return f.apply(cm, arguments) }
3964        finally { endOperation(cm); }
3965      }
3966    }
3967    // Used to add methods to editor and doc instances, wrapping them in
3968    // operations.
3969    function methodOp(f) {
3970      return function() {
3971        if (this.curOp) { return f.apply(this, arguments) }
3972        startOperation(this);
3973        try { return f.apply(this, arguments) }
3974        finally { endOperation(this); }
3975      }
3976    }
3977    function docMethodOp(f) {
3978      return function() {
3979        var cm = this.cm;
3980        if (!cm || cm.curOp) { return f.apply(this, arguments) }
3981        startOperation(cm);
3982        try { return f.apply(this, arguments) }
3983        finally { endOperation(cm); }
3984      }
3985    }
3986  
3987    // HIGHLIGHT WORKER
3988  
3989    function startWorker(cm, time) {
3990      if (cm.doc.highlightFrontier < cm.display.viewTo)
3991        { cm.state.highlight.set(time, bind(highlightWorker, cm)); }
3992    }
3993  
3994    function highlightWorker(cm) {
3995      var doc = cm.doc;
3996      if (doc.highlightFrontier >= cm.display.viewTo) { return }
3997      var end = +new Date + cm.options.workTime;
3998      var context = getContextBefore(cm, doc.highlightFrontier);
3999      var changedLines = [];
4000  
4001      doc.iter(context.line, Math.min(doc.first + doc.size, cm.display.viewTo + 500), function (line) {
4002        if (context.line >= cm.display.viewFrom) { // Visible
4003          var oldStyles = line.styles;
4004          var resetState = line.text.length > cm.options.maxHighlightLength ? copyState(doc.mode, context.state) : null;
4005          var highlighted = highlightLine(cm, line, context, true);
4006          if (resetState) { context.state = resetState; }
4007          line.styles = highlighted.styles;
4008          var oldCls = line.styleClasses, newCls = highlighted.classes;
4009          if (newCls) { line.styleClasses = newCls; }
4010          else if (oldCls) { line.styleClasses = null; }
4011          var ischange = !oldStyles || oldStyles.length != line.styles.length ||
4012            oldCls != newCls && (!oldCls || !newCls || oldCls.bgClass != newCls.bgClass || oldCls.textClass != newCls.textClass);
4013          for (var i = 0; !ischange && i < oldStyles.length; ++i) { ischange = oldStyles[i] != line.styles[i]; }
4014          if (ischange) { changedLines.push(context.line); }
4015          line.stateAfter = context.save();
4016          context.nextLine();
4017        } else {
4018          if (line.text.length <= cm.options.maxHighlightLength)
4019            { processLine(cm, line.text, context); }
4020          line.stateAfter = context.line % 5 == 0 ? context.save() : null;
4021          context.nextLine();
4022        }
4023        if (+new Date > end) {
4024          startWorker(cm, cm.options.workDelay);
4025          return true
4026        }
4027      });
4028      doc.highlightFrontier = context.line;
4029      doc.modeFrontier = Math.max(doc.modeFrontier, context.line);
4030      if (changedLines.length) { runInOp(cm, function () {
4031        for (var i = 0; i < changedLines.length; i++)
4032          { regLineChange(cm, changedLines[i], "text"); }
4033      }); }
4034    }
4035  
4036    // DISPLAY DRAWING
4037  
4038    var DisplayUpdate = function(cm, viewport, force) {
4039      var display = cm.display;
4040  
4041      this.viewport = viewport;
4042      // Store some values that we'll need later (but don't want to force a relayout for)
4043      this.visible = visibleLines(display, cm.doc, viewport);
4044      this.editorIsHidden = !display.wrapper.offsetWidth;
4045      this.wrapperHeight = display.wrapper.clientHeight;
4046      this.wrapperWidth = display.wrapper.clientWidth;
4047      this.oldDisplayWidth = displayWidth(cm);
4048      this.force = force;
4049      this.dims = getDimensions(cm);
4050      this.events = [];
4051    };
4052  
4053    DisplayUpdate.prototype.signal = function (emitter, type) {
4054      if (hasHandler(emitter, type))
4055        { this.events.push(arguments); }
4056    };
4057    DisplayUpdate.prototype.finish = function () {
4058      for (var i = 0; i < this.events.length; i++)
4059        { signal.apply(null, this.events[i]); }
4060    };
4061  
4062    function maybeClipScrollbars(cm) {
4063      var display = cm.display;
4064      if (!display.scrollbarsClipped && display.scroller.offsetWidth) {
4065        display.nativeBarWidth = display.scroller.offsetWidth - display.scroller.clientWidth;
4066        display.heightForcer.style.height = scrollGap(cm) + "px";
4067        display.sizer.style.marginBottom = -display.nativeBarWidth + "px";
4068        display.sizer.style.borderRightWidth = scrollGap(cm) + "px";
4069        display.scrollbarsClipped = true;
4070      }
4071    }
4072  
4073    function selectionSnapshot(cm) {
4074      if (cm.hasFocus()) { return null }
4075      var active = activeElt();
4076      if (!active || !contains(cm.display.lineDiv, active)) { return null }
4077      var result = {activeElt: active};
4078      if (window.getSelection) {
4079        var sel = window.getSelection();
4080        if (sel.anchorNode && sel.extend && contains(cm.display.lineDiv, sel.anchorNode)) {
4081          result.anchorNode = sel.anchorNode;
4082          result.anchorOffset = sel.anchorOffset;
4083          result.focusNode = sel.focusNode;
4084          result.focusOffset = sel.focusOffset;
4085        }
4086      }
4087      return result
4088    }
4089  
4090    function restoreSelection(snapshot) {
4091      if (!snapshot || !snapshot.activeElt || snapshot.activeElt == activeElt()) { return }
4092      snapshot.activeElt.focus();
4093      if (!/^(INPUT|TEXTAREA)$/.test(snapshot.activeElt.nodeName) &&
4094          snapshot.anchorNode && contains(document.body, snapshot.anchorNode) && contains(document.body, snapshot.focusNode)) {
4095        var sel = window.getSelection(), range = document.createRange();
4096        range.setEnd(snapshot.anchorNode, snapshot.anchorOffset);
4097        range.collapse(false);
4098        sel.removeAllRanges();
4099        sel.addRange(range);
4100        sel.extend(snapshot.focusNode, snapshot.focusOffset);
4101      }
4102    }
4103  
4104    // Does the actual updating of the line display. Bails out
4105    // (returning false) when there is nothing to be done and forced is
4106    // false.
4107    function updateDisplayIfNeeded(cm, update) {
4108      var display = cm.display, doc = cm.doc;
4109  
4110      if (update.editorIsHidden) {
4111        resetView(cm);
4112        return false
4113      }
4114  
4115      // Bail out if the visible area is already rendered and nothing changed.
4116      if (!update.force &&
4117          update.visible.from >= display.viewFrom && update.visible.to <= display.viewTo &&
4118          (display.updateLineNumbers == null || display.updateLineNumbers >= display.viewTo) &&
4119          display.renderedView == display.view && countDirtyView(cm) == 0)
4120        { return false }
4121  
4122      if (maybeUpdateLineNumberWidth(cm)) {
4123        resetView(cm);
4124        update.dims = getDimensions(cm);
4125      }
4126  
4127      // Compute a suitable new viewport (from & to)
4128      var end = doc.first + doc.size;
4129      var from = Math.max(update.visible.from - cm.options.viewportMargin, doc.first);
4130      var to = Math.min(end, update.visible.to + cm.options.viewportMargin);
4131      if (display.viewFrom < from && from - display.viewFrom < 20) { from = Math.max(doc.first, display.viewFrom); }
4132      if (display.viewTo > to && display.viewTo - to < 20) { to = Math.min(end, display.viewTo); }
4133      if (sawCollapsedSpans) {
4134        from = visualLineNo(cm.doc, from);
4135        to = visualLineEndNo(cm.doc, to);
4136      }
4137  
4138      var different = from != display.viewFrom || to != display.viewTo ||
4139        display.lastWrapHeight != update.wrapperHeight || display.lastWrapWidth != update.wrapperWidth;
4140      adjustView(cm, from, to);
4141  
4142      display.viewOffset = heightAtLine(getLine(cm.doc, display.viewFrom));
4143      // Position the mover div to align with the current scroll position
4144      cm.display.mover.style.top = display.viewOffset + "px";
4145  
4146      var toUpdate = countDirtyView(cm);
4147      if (!different && toUpdate == 0 && !update.force && display.renderedView == display.view &&
4148          (display.updateLineNumbers == null || display.updateLineNumbers >= display.viewTo))
4149        { return false }
4150  
4151      // For big changes, we hide the enclosing element during the
4152      // update, since that speeds up the operations on most browsers.
4153      var selSnapshot = selectionSnapshot(cm);
4154      if (toUpdate > 4) { display.lineDiv.style.display = "none"; }
4155      patchDisplay(cm, display.updateLineNumbers, update.dims);
4156      if (toUpdate > 4) { display.lineDiv.style.display = ""; }
4157      display.renderedView = display.view;
4158      // There might have been a widget with a focused element that got
4159      // hidden or updated, if so re-focus it.
4160      restoreSelection(selSnapshot);
4161  
4162      // Prevent selection and cursors from interfering with the scroll
4163      // width and height.
4164      removeChildren(display.cursorDiv);
4165      removeChildren(display.selectionDiv);
4166      display.gutters.style.height = display.sizer.style.minHeight = 0;
4167  
4168      if (different) {
4169        display.lastWrapHeight = update.wrapperHeight;
4170        display.lastWrapWidth = update.wrapperWidth;
4171        startWorker(cm, 400);
4172      }
4173  
4174      display.updateLineNumbers = null;
4175  
4176      return true
4177    }
4178  
4179    function postUpdateDisplay(cm, update) {
4180      var viewport = update.viewport;
4181  
4182      for (var first = true;; first = false) {
4183        if (!first || !cm.options.lineWrapping || update.oldDisplayWidth == displayWidth(cm)) {
4184          // Clip forced viewport to actual scrollable area.
4185          if (viewport && viewport.top != null)
4186            { viewport = {top: Math.min(cm.doc.height + paddingVert(cm.display) - displayHeight(cm), viewport.top)}; }
4187          // Updated line heights might result in the drawn area not
4188          // actually covering the viewport. Keep looping until it does.
4189          update.visible = visibleLines(cm.display, cm.doc, viewport);
4190          if (update.visible.from >= cm.display.viewFrom && update.visible.to <= cm.display.viewTo)
4191            { break }
4192        } else if (first) {
4193          update.visible = visibleLines(cm.display, cm.doc, viewport);
4194        }
4195        if (!updateDisplayIfNeeded(cm, update)) { break }
4196        updateHeightsInViewport(cm);
4197        var barMeasure = measureForScrollbars(cm);
4198        updateSelection(cm);
4199        updateScrollbars(cm, barMeasure);
4200        setDocumentHeight(cm, barMeasure);
4201        update.force = false;
4202      }
4203  
4204      update.signal(cm, "update", cm);
4205      if (cm.display.viewFrom != cm.display.reportedViewFrom || cm.display.viewTo != cm.display.reportedViewTo) {
4206        update.signal(cm, "viewportChange", cm, cm.display.viewFrom, cm.display.viewTo);
4207        cm.display.reportedViewFrom = cm.display.viewFrom; cm.display.reportedViewTo = cm.display.viewTo;
4208      }
4209    }
4210  
4211    function updateDisplaySimple(cm, viewport) {
4212      var update = new DisplayUpdate(cm, viewport);
4213      if (updateDisplayIfNeeded(cm, update)) {
4214        updateHeightsInViewport(cm);
4215        postUpdateDisplay(cm, update);
4216        var barMeasure = measureForScrollbars(cm);
4217        updateSelection(cm);
4218        updateScrollbars(cm, barMeasure);
4219        setDocumentHeight(cm, barMeasure);
4220        update.finish();
4221      }
4222    }
4223  
4224    // Sync the actual display DOM structure with display.view, removing
4225    // nodes for lines that are no longer in view, and creating the ones
4226    // that are not there yet, and updating the ones that are out of
4227    // date.
4228    function patchDisplay(cm, updateNumbersFrom, dims) {
4229      var display = cm.display, lineNumbers = cm.options.lineNumbers;
4230      var container = display.lineDiv, cur = container.firstChild;
4231  
4232      function rm(node) {
4233        var next = node.nextSibling;
4234        // Works around a throw-scroll bug in OS X Webkit
4235        if (webkit && mac && cm.display.currentWheelTarget == node)
4236          { node.style.display = "none"; }
4237        else
4238          { node.parentNode.removeChild(node); }
4239        return next
4240      }
4241  
4242      var view = display.view, lineN = display.viewFrom;
4243      // Loop over the elements in the view, syncing cur (the DOM nodes
4244      // in display.lineDiv) with the view as we go.
4245      for (var i = 0; i < view.length; i++) {
4246        var lineView = view[i];
4247        if (lineView.hidden) ; else if (!lineView.node || lineView.node.parentNode != container) { // Not drawn yet
4248          var node = buildLineElement(cm, lineView, lineN, dims);
4249          container.insertBefore(node, cur);
4250        } else { // Already drawn
4251          while (cur != lineView.node) { cur = rm(cur); }
4252          var updateNumber = lineNumbers && updateNumbersFrom != null &&
4253            updateNumbersFrom <= lineN && lineView.lineNumber;
4254          if (lineView.changes) {
4255            if (indexOf(lineView.changes, "gutter") > -1) { updateNumber = false; }
4256            updateLineForChanges(cm, lineView, lineN, dims);
4257          }
4258          if (updateNumber) {
4259            removeChildren(lineView.lineNumber);
4260            lineView.lineNumber.appendChild(document.createTextNode(lineNumberFor(cm.options, lineN)));
4261          }
4262          cur = lineView.node.nextSibling;
4263        }
4264        lineN += lineView.size;
4265      }
4266      while (cur) { cur = rm(cur); }
4267    }
4268  
4269    function updateGutterSpace(display) {
4270      var width = display.gutters.offsetWidth;
4271      display.sizer.style.marginLeft = width + "px";
4272      // Send an event to consumers responding to changes in gutter width.
4273      signalLater(display, "gutterChanged", display);
4274    }
4275  
4276    function setDocumentHeight(cm, measure) {
4277      cm.display.sizer.style.minHeight = measure.docHeight + "px";
4278      cm.display.heightForcer.style.top = measure.docHeight + "px";
4279      cm.display.gutters.style.height = (measure.docHeight + cm.display.barHeight + scrollGap(cm)) + "px";
4280    }
4281  
4282    // Re-align line numbers and gutter marks to compensate for
4283    // horizontal scrolling.
4284    function alignHorizontally(cm) {
4285      var display = cm.display, view = display.view;
4286      if (!display.alignWidgets && (!display.gutters.firstChild || !cm.options.fixedGutter)) { return }
4287      var comp = compensateForHScroll(display) - display.scroller.scrollLeft + cm.doc.scrollLeft;
4288      var gutterW = display.gutters.offsetWidth, left = comp + "px";
4289      for (var i = 0; i < view.length; i++) { if (!view[i].hidden) {
4290        if (cm.options.fixedGutter) {
4291          if (view[i].gutter)
4292            { view[i].gutter.style.left = left; }
4293          if (view[i].gutterBackground)
4294            { view[i].gutterBackground.style.left = left; }
4295        }
4296        var align = view[i].alignable;
4297        if (align) { for (var j = 0; j < align.length; j++)
4298          { align[j].style.left = left; } }
4299      } }
4300      if (cm.options.fixedGutter)
4301        { display.gutters.style.left = (comp + gutterW) + "px"; }
4302    }
4303  
4304    // Used to ensure that the line number gutter is still the right
4305    // size for the current document size. Returns true when an update
4306    // is needed.
4307    function maybeUpdateLineNumberWidth(cm) {
4308      if (!cm.options.lineNumbers) { return false }
4309      var doc = cm.doc, last = lineNumberFor(cm.options, doc.first + doc.size - 1), display = cm.display;
4310      if (last.length != display.lineNumChars) {
4311        var test = display.measure.appendChild(elt("div", [elt("div", last)],
4312                                                   "CodeMirror-linenumber CodeMirror-gutter-elt"));
4313        var innerW = test.firstChild.offsetWidth, padding = test.offsetWidth - innerW;
4314        display.lineGutter.style.width = "";
4315        display.lineNumInnerWidth = Math.max(innerW, display.lineGutter.offsetWidth - padding) + 1;
4316        display.lineNumWidth = display.lineNumInnerWidth + padding;
4317        display.lineNumChars = display.lineNumInnerWidth ? last.length : -1;
4318        display.lineGutter.style.width = display.lineNumWidth + "px";
4319        updateGutterSpace(cm.display);
4320        return true
4321      }
4322      return false
4323    }
4324  
4325    function getGutters(gutters, lineNumbers) {
4326      var result = [], sawLineNumbers = false;
4327      for (var i = 0; i < gutters.length; i++) {
4328        var name = gutters[i], style = null;
4329        if (typeof name != "string") { style = name.style; name = name.className; }
4330        if (name == "CodeMirror-linenumbers") {
4331          if (!lineNumbers) { continue }
4332          else { sawLineNumbers = true; }
4333        }
4334        result.push({className: name, style: style});
4335      }
4336      if (lineNumbers && !sawLineNumbers) { result.push({className: "CodeMirror-linenumbers", style: null}); }
4337      return result
4338    }
4339  
4340    // Rebuild the gutter elements, ensure the margin to the left of the
4341    // code matches their width.
4342    function renderGutters(display) {
4343      var gutters = display.gutters, specs = display.gutterSpecs;
4344      removeChildren(gutters);
4345      display.lineGutter = null;
4346      for (var i = 0; i < specs.length; ++i) {
4347        var ref = specs[i];
4348        var className = ref.className;
4349        var style = ref.style;
4350        var gElt = gutters.appendChild(elt("div", null, "CodeMirror-gutter " + className));
4351        if (style) { gElt.style.cssText = style; }
4352        if (className == "CodeMirror-linenumbers") {
4353          display.lineGutter = gElt;
4354          gElt.style.width = (display.lineNumWidth || 1) + "px";
4355        }
4356      }
4357      gutters.style.display = specs.length ? "" : "none";
4358      updateGutterSpace(display);
4359    }
4360  
4361    function updateGutters(cm) {
4362      renderGutters(cm.display);
4363      regChange(cm);
4364      alignHorizontally(cm);
4365    }
4366  
4367    // The display handles the DOM integration, both for input reading
4368    // and content drawing. It holds references to DOM nodes and
4369    // display-related state.
4370  
4371    function Display(place, doc, input, options) {
4372      var d = this;
4373      this.input = input;
4374  
4375      // Covers bottom-right square when both scrollbars are present.
4376      d.scrollbarFiller = elt("div", null, "CodeMirror-scrollbar-filler");
4377      d.scrollbarFiller.setAttribute("cm-not-content", "true");
4378      // Covers bottom of gutter when coverGutterNextToScrollbar is on
4379      // and h scrollbar is present.
4380      d.gutterFiller = elt("div", null, "CodeMirror-gutter-filler");
4381      d.gutterFiller.setAttribute("cm-not-content", "true");
4382      // Will contain the actual code, positioned to cover the viewport.
4383      d.lineDiv = eltP("div", null, "CodeMirror-code");
4384      // Elements are added to these to represent selection and cursors.
4385      d.selectionDiv = elt("div", null, null, "position: relative; z-index: 1");
4386      d.cursorDiv = elt("div", null, "CodeMirror-cursors");
4387      // A visibility: hidden element used to find the size of things.
4388      d.measure = elt("div", null, "CodeMirror-measure");
4389      // When lines outside of the viewport are measured, they are drawn in this.
4390      d.lineMeasure = elt("div", null, "CodeMirror-measure");
4391      // Wraps everything that needs to exist inside the vertically-padded coordinate system
4392      d.lineSpace = eltP("div", [d.measure, d.lineMeasure, d.selectionDiv, d.cursorDiv, d.lineDiv],
4393                        null, "position: relative; outline: none");
4394      var lines = eltP("div", [d.lineSpace], "CodeMirror-lines");
4395      // Moved around its parent to cover visible view.
4396      d.mover = elt("div", [lines], null, "position: relative");
4397      // Set to the height of the document, allowing scrolling.
4398      d.sizer = elt("div", [d.mover], "CodeMirror-sizer");
4399      d.sizerWidth = null;
4400      // Behavior of elts with overflow: auto and padding is
4401      // inconsistent across browsers. This is used to ensure the
4402      // scrollable area is big enough.
4403      d.heightForcer = elt("div", null, null, "position: absolute; height: " + scrollerGap + "px; width: 1px;");
4404      // Will contain the gutters, if any.
4405      d.gutters = elt("div", null, "CodeMirror-gutters");
4406      d.lineGutter = null;
4407      // Actual scrollable element.
4408      d.scroller = elt("div", [d.sizer, d.heightForcer, d.gutters], "CodeMirror-scroll");
4409      d.scroller.setAttribute("tabIndex", "-1");
4410      // The element in which the editor lives.
4411      d.wrapper = elt("div", [d.scrollbarFiller, d.gutterFiller, d.scroller], "CodeMirror");
4412  
4413      // This attribute is respected by automatic translation systems such as Google Translate,
4414      // and may also be respected by tools used by human translators.
4415      d.wrapper.setAttribute('translate', 'no');
4416  
4417      // Work around IE7 z-index bug (not perfect, hence IE7 not really being supported)
4418      if (ie && ie_version < 8) { d.gutters.style.zIndex = -1; d.scroller.style.paddingRight = 0; }
4419      if (!webkit && !(gecko && mobile)) { d.scroller.draggable = true; }
4420  
4421      if (place) {
4422        if (place.appendChild) { place.appendChild(d.wrapper); }
4423        else { place(d.wrapper); }
4424      }
4425  
4426      // Current rendered range (may be bigger than the view window).
4427      d.viewFrom = d.viewTo = doc.first;
4428      d.reportedViewFrom = d.reportedViewTo = doc.first;
4429      // Information about the rendered lines.
4430      d.view = [];
4431      d.renderedView = null;
4432      // Holds info about a single rendered line when it was rendered
4433      // for measurement, while not in view.
4434      d.externalMeasured = null;
4435      // Empty space (in pixels) above the view
4436      d.viewOffset = 0;
4437      d.lastWrapHeight = d.lastWrapWidth = 0;
4438      d.updateLineNumbers = null;
4439  
4440      d.nativeBarWidth = d.barHeight = d.barWidth = 0;
4441      d.scrollbarsClipped = false;
4442  
4443      // Used to only resize the line number gutter when necessary (when
4444      // the amount of lines crosses a boundary that makes its width change)
4445      d.lineNumWidth = d.lineNumInnerWidth = d.lineNumChars = null;
4446      // Set to true when a non-horizontal-scrolling line widget is
4447      // added. As an optimization, line widget aligning is skipped when
4448      // this is false.
4449      d.alignWidgets = false;
4450  
4451      d.cachedCharWidth = d.cachedTextHeight = d.cachedPaddingH = null;
4452  
4453      // Tracks the maximum line length so that the horizontal scrollbar
4454      // can be kept static when scrolling.
4455      d.maxLine = null;
4456      d.maxLineLength = 0;
4457      d.maxLineChanged = false;
4458  
4459      // Used for measuring wheel scrolling granularity
4460      d.wheelDX = d.wheelDY = d.wheelStartX = d.wheelStartY = null;
4461  
4462      // True when shift is held down.
4463      d.shift = false;
4464  
4465      // Used to track whether anything happened since the context menu
4466      // was opened.
4467      d.selForContextMenu = null;
4468  
4469      d.activeTouch = null;
4470  
4471      d.gutterSpecs = getGutters(options.gutters, options.lineNumbers);
4472      renderGutters(d);
4473  
4474      input.init(d);
4475    }
4476  
4477    // Since the delta values reported on mouse wheel events are
4478    // unstandardized between browsers and even browser versions, and
4479    // generally horribly unpredictable, this code starts by measuring
4480    // the scroll effect that the first few mouse wheel events have,
4481    // and, from that, detects the way it can convert deltas to pixel
4482    // offsets afterwards.
4483    //
4484    // The reason we want to know the amount a wheel event will scroll
4485    // is that it gives us a chance to update the display before the
4486    // actual scrolling happens, reducing flickering.
4487  
4488    var wheelSamples = 0, wheelPixelsPerUnit = null;
4489    // Fill in a browser-detected starting value on browsers where we
4490    // know one. These don't have to be accurate -- the result of them
4491    // being wrong would just be a slight flicker on the first wheel
4492    // scroll (if it is large enough).
4493    if (ie) { wheelPixelsPerUnit = -.53; }
4494    else if (gecko) { wheelPixelsPerUnit = 15; }
4495    else if (chrome) { wheelPixelsPerUnit = -.7; }
4496    else if (safari) { wheelPixelsPerUnit = -1/3; }
4497  
4498    function wheelEventDelta(e) {
4499      var dx = e.wheelDeltaX, dy = e.wheelDeltaY;
4500      if (dx == null && e.detail && e.axis == e.HORIZONTAL_AXIS) { dx = e.detail; }
4501      if (dy == null && e.detail && e.axis == e.VERTICAL_AXIS) { dy = e.detail; }
4502      else if (dy == null) { dy = e.wheelDelta; }
4503      return {x: dx, y: dy}
4504    }
4505    function wheelEventPixels(e) {
4506      var delta = wheelEventDelta(e);
4507      delta.x *= wheelPixelsPerUnit;
4508      delta.y *= wheelPixelsPerUnit;
4509      return delta
4510    }
4511  
4512    function onScrollWheel(cm, e) {
4513      // On Chrome 102, viewport updates somehow stop wheel-based
4514      // scrolling. Turning off pointer events during the scroll seems
4515      // to avoid the issue.
4516      if (chrome && chrome_version >= 102) {
4517        if (cm.display.chromeScrollHack == null) { cm.display.sizer.style.pointerEvents = "none"; }
4518        else { clearTimeout(cm.display.chromeScrollHack); }
4519        cm.display.chromeScrollHack = setTimeout(function () {
4520          cm.display.chromeScrollHack = null;
4521          cm.display.sizer.style.pointerEvents = "";
4522        }, 100);
4523      }
4524      var delta = wheelEventDelta(e), dx = delta.x, dy = delta.y;
4525      var pixelsPerUnit = wheelPixelsPerUnit;
4526      if (e.deltaMode === 0) {
4527        dx = e.deltaX;
4528        dy = e.deltaY;
4529        pixelsPerUnit = 1;
4530      }
4531  
4532      var display = cm.display, scroll = display.scroller;
4533      // Quit if there's nothing to scroll here
4534      var canScrollX = scroll.scrollWidth > scroll.clientWidth;
4535      var canScrollY = scroll.scrollHeight > scroll.clientHeight;
4536      if (!(dx && canScrollX || dy && canScrollY)) { return }
4537  
4538      // Webkit browsers on OS X abort momentum scrolls when the target
4539      // of the scroll event is removed from the scrollable element.
4540      // This hack (see related code in patchDisplay) makes sure the
4541      // element is kept around.
4542      if (dy && mac && webkit) {
4543        outer: for (var cur = e.target, view = display.view; cur != scroll; cur = cur.parentNode) {
4544          for (var i = 0; i < view.length; i++) {
4545            if (view[i].node == cur) {
4546              cm.display.currentWheelTarget = cur;
4547              break outer
4548            }
4549          }
4550        }
4551      }
4552  
4553      // On some browsers, horizontal scrolling will cause redraws to
4554      // happen before the gutter has been realigned, causing it to
4555      // wriggle around in a most unseemly way. When we have an
4556      // estimated pixels/delta value, we just handle horizontal
4557      // scrolling entirely here. It'll be slightly off from native, but
4558      // better than glitching out.
4559      if (dx && !gecko && !presto && pixelsPerUnit != null) {
4560        if (dy && canScrollY)
4561          { updateScrollTop(cm, Math.max(0, scroll.scrollTop + dy * pixelsPerUnit)); }
4562        setScrollLeft(cm, Math.max(0, scroll.scrollLeft + dx * pixelsPerUnit));
4563        // Only prevent default scrolling if vertical scrolling is
4564        // actually possible. Otherwise, it causes vertical scroll
4565        // jitter on OSX trackpads when deltaX is small and deltaY
4566        // is large (issue #3579)
4567        if (!dy || (dy && canScrollY))
4568          { e_preventDefault(e); }
4569        display.wheelStartX = null; // Abort measurement, if in progress
4570        return
4571      }
4572  
4573      // 'Project' the visible viewport to cover the area that is being
4574      // scrolled into view (if we know enough to estimate it).
4575      if (dy && pixelsPerUnit != null) {
4576        var pixels = dy * pixelsPerUnit;
4577        var top = cm.doc.scrollTop, bot = top + display.wrapper.clientHeight;
4578        if (pixels < 0) { top = Math.max(0, top + pixels - 50); }
4579        else { bot = Math.min(cm.doc.height, bot + pixels + 50); }
4580        updateDisplaySimple(cm, {top: top, bottom: bot});
4581      }
4582  
4583      if (wheelSamples < 20 && e.deltaMode !== 0) {
4584        if (display.wheelStartX == null) {
4585          display.wheelStartX = scroll.scrollLeft; display.wheelStartY = scroll.scrollTop;
4586          display.wheelDX = dx; display.wheelDY = dy;
4587          setTimeout(function () {
4588            if (display.wheelStartX == null) { return }
4589            var movedX = scroll.scrollLeft - display.wheelStartX;
4590            var movedY = scroll.scrollTop - display.wheelStartY;
4591            var sample = (movedY && display.wheelDY && movedY / display.wheelDY) ||
4592              (movedX && display.wheelDX && movedX / display.wheelDX);
4593            display.wheelStartX = display.wheelStartY = null;
4594            if (!sample) { return }
4595            wheelPixelsPerUnit = (wheelPixelsPerUnit * wheelSamples + sample) / (wheelSamples + 1);
4596            ++wheelSamples;
4597          }, 200);
4598        } else {
4599          display.wheelDX += dx; display.wheelDY += dy;
4600        }
4601      }
4602    }
4603  
4604    // Selection objects are immutable. A new one is created every time
4605    // the selection changes. A selection is one or more non-overlapping
4606    // (and non-touching) ranges, sorted, and an integer that indicates
4607    // which one is the primary selection (the one that's scrolled into
4608    // view, that getCursor returns, etc).
4609    var Selection = function(ranges, primIndex) {
4610      this.ranges = ranges;
4611      this.primIndex = primIndex;
4612    };
4613  
4614    Selection.prototype.primary = function () { return this.ranges[this.primIndex] };
4615  
4616    Selection.prototype.equals = function (other) {
4617      if (other == this) { return true }
4618      if (other.primIndex != this.primIndex || other.ranges.length != this.ranges.length) { return false }
4619      for (var i = 0; i < this.ranges.length; i++) {
4620        var here = this.ranges[i], there = other.ranges[i];
4621        if (!equalCursorPos(here.anchor, there.anchor) || !equalCursorPos(here.head, there.head)) { return false }
4622      }
4623      return true
4624    };
4625  
4626    Selection.prototype.deepCopy = function () {
4627      var out = [];
4628      for (var i = 0; i < this.ranges.length; i++)
4629        { out[i] = new Range(copyPos(this.ranges[i].anchor), copyPos(this.ranges[i].head)); }
4630      return new Selection(out, this.primIndex)
4631    };
4632  
4633    Selection.prototype.somethingSelected = function () {
4634      for (var i = 0; i < this.ranges.length; i++)
4635        { if (!this.ranges[i].empty()) { return true } }
4636      return false
4637    };
4638  
4639    Selection.prototype.contains = function (pos, end) {
4640      if (!end) { end = pos; }
4641      for (var i = 0; i < this.ranges.length; i++) {
4642        var range = this.ranges[i];
4643        if (cmp(end, range.from()) >= 0 && cmp(pos, range.to()) <= 0)
4644          { return i }
4645      }
4646      return -1
4647    };
4648  
4649    var Range = function(anchor, head) {
4650      this.anchor = anchor; this.head = head;
4651    };
4652  
4653    Range.prototype.from = function () { return minPos(this.anchor, this.head) };
4654    Range.prototype.to = function () { return maxPos(this.anchor, this.head) };
4655    Range.prototype.empty = function () { return this.head.line == this.anchor.line && this.head.ch == this.anchor.ch };
4656  
4657    // Take an unsorted, potentially overlapping set of ranges, and
4658    // build a selection out of it. 'Consumes' ranges array (modifying
4659    // it).
4660    function normalizeSelection(cm, ranges, primIndex) {
4661      var mayTouch = cm && cm.options.selectionsMayTouch;
4662      var prim = ranges[primIndex];
4663      ranges.sort(function (a, b) { return cmp(a.from(), b.from()); });
4664      primIndex = indexOf(ranges, prim);
4665      for (var i = 1; i < ranges.length; i++) {
4666        var cur = ranges[i], prev = ranges[i - 1];
4667        var diff = cmp(prev.to(), cur.from());
4668        if (mayTouch && !cur.empty() ? diff > 0 : diff >= 0) {
4669          var from = minPos(prev.from(), cur.from()), to = maxPos(prev.to(), cur.to());
4670          var inv = prev.empty() ? cur.from() == cur.head : prev.from() == prev.head;
4671          if (i <= primIndex) { --primIndex; }
4672          ranges.splice(--i, 2, new Range(inv ? to : from, inv ? from : to));
4673        }
4674      }
4675      return new Selection(ranges, primIndex)
4676    }
4677  
4678    function simpleSelection(anchor, head) {
4679      return new Selection([new Range(anchor, head || anchor)], 0)
4680    }
4681  
4682    // Compute the position of the end of a change (its 'to' property
4683    // refers to the pre-change end).
4684    function changeEnd(change) {
4685      if (!change.text) { return change.to }
4686      return Pos(change.from.line + change.text.length - 1,
4687                 lst(change.text).length + (change.text.length == 1 ? change.from.ch : 0))
4688    }
4689  
4690    // Adjust a position to refer to the post-change position of the
4691    // same text, or the end of the change if the change covers it.
4692    function adjustForChange(pos, change) {
4693      if (cmp(pos, change.from) < 0) { return pos }
4694      if (cmp(pos, change.to) <= 0) { return changeEnd(change) }
4695  
4696      var line = pos.line + change.text.length - (change.to.line - change.from.line) - 1, ch = pos.ch;
4697      if (pos.line == change.to.line) { ch += changeEnd(change).ch - change.to.ch; }
4698      return Pos(line, ch)
4699    }
4700  
4701    function computeSelAfterChange(doc, change) {
4702      var out = [];
4703      for (var i = 0; i < doc.sel.ranges.length; i++) {
4704        var range = doc.sel.ranges[i];
4705        out.push(new Range(adjustForChange(range.anchor, change),
4706                           adjustForChange(range.head, change)));
4707      }
4708      return normalizeSelection(doc.cm, out, doc.sel.primIndex)
4709    }
4710  
4711    function offsetPos(pos, old, nw) {
4712      if (pos.line == old.line)
4713        { return Pos(nw.line, pos.ch - old.ch + nw.ch) }
4714      else
4715        { return Pos(nw.line + (pos.line - old.line), pos.ch) }
4716    }
4717  
4718    // Used by replaceSelections to allow moving the selection to the
4719    // start or around the replaced test. Hint may be "start" or "around".
4720    function computeReplacedSel(doc, changes, hint) {
4721      var out = [];
4722      var oldPrev = Pos(doc.first, 0), newPrev = oldPrev;
4723      for (var i = 0; i < changes.length; i++) {
4724        var change = changes[i];
4725        var from = offsetPos(change.from, oldPrev, newPrev);
4726        var to = offsetPos(changeEnd(change), oldPrev, newPrev);
4727        oldPrev = change.to;
4728        newPrev = to;
4729        if (hint == "around") {
4730          var range = doc.sel.ranges[i], inv = cmp(range.head, range.anchor) < 0;
4731          out[i] = new Range(inv ? to : from, inv ? from : to);
4732        } else {
4733          out[i] = new Range(from, from);
4734        }
4735      }
4736      return new Selection(out, doc.sel.primIndex)
4737    }
4738  
4739    // Used to get the editor into a consistent state again when options change.
4740  
4741    function loadMode(cm) {
4742      cm.doc.mode = getMode(cm.options, cm.doc.modeOption);
4743      resetModeState(cm);
4744    }
4745  
4746    function resetModeState(cm) {
4747      cm.doc.iter(function (line) {
4748        if (line.stateAfter) { line.stateAfter = null; }
4749        if (line.styles) { line.styles = null; }
4750      });
4751      cm.doc.modeFrontier = cm.doc.highlightFrontier = cm.doc.first;
4752      startWorker(cm, 100);
4753      cm.state.modeGen++;
4754      if (cm.curOp) { regChange(cm); }
4755    }
4756  
4757    // DOCUMENT DATA STRUCTURE
4758  
4759    // By default, updates that start and end at the beginning of a line
4760    // are treated specially, in order to make the association of line
4761    // widgets and marker elements with the text behave more intuitive.
4762    function isWholeLineUpdate(doc, change) {
4763      return change.from.ch == 0 && change.to.ch == 0 && lst(change.text) == "" &&
4764        (!doc.cm || doc.cm.options.wholeLineUpdateBefore)
4765    }
4766  
4767    // Perform a change on the document data structure.
4768    function updateDoc(doc, change, markedSpans, estimateHeight) {
4769      function spansFor(n) {return markedSpans ? markedSpans[n] : null}
4770      function update(line, text, spans) {
4771        updateLine(line, text, spans, estimateHeight);
4772        signalLater(line, "change", line, change);
4773      }
4774      function linesFor(start, end) {
4775        var result = [];
4776        for (var i = start; i < end; ++i)
4777          { result.push(new Line(text[i], spansFor(i), estimateHeight)); }
4778        return result
4779      }
4780  
4781      var from = change.from, to = change.to, text = change.text;
4782      var firstLine = getLine(doc, from.line), lastLine = getLine(doc, to.line);
4783      var lastText = lst(text), lastSpans = spansFor(text.length - 1), nlines = to.line - from.line;
4784  
4785      // Adjust the line structure
4786      if (change.full) {
4787        doc.insert(0, linesFor(0, text.length));
4788        doc.remove(text.length, doc.size - text.length);
4789      } else if (isWholeLineUpdate(doc, change)) {
4790        // This is a whole-line replace. Treated specially to make
4791        // sure line objects move the way they are supposed to.
4792        var added = linesFor(0, text.length - 1);
4793        update(lastLine, lastLine.text, lastSpans);
4794        if (nlines) { doc.remove(from.line, nlines); }
4795        if (added.length) { doc.insert(from.line, added); }
4796      } else if (firstLine == lastLine) {
4797        if (text.length == 1) {
4798          update(firstLine, firstLine.text.slice(0, from.ch) + lastText + firstLine.text.slice(to.ch), lastSpans);
4799        } else {
4800          var added$1 = linesFor(1, text.length - 1);
4801          added$1.push(new Line(lastText + firstLine.text.slice(to.ch), lastSpans, estimateHeight));
4802          update(firstLine, firstLine.text.slice(0, from.ch) + text[0], spansFor(0));
4803          doc.insert(from.line + 1, added$1);
4804        }
4805      } else if (text.length == 1) {
4806        update(firstLine, firstLine.text.slice(0, from.ch) + text[0] + lastLine.text.slice(to.ch), spansFor(0));
4807        doc.remove(from.line + 1, nlines);
4808      } else {
4809        update(firstLine, firstLine.text.slice(0, from.ch) + text[0], spansFor(0));
4810        update(lastLine, lastText + lastLine.text.slice(to.ch), lastSpans);
4811        var added$2 = linesFor(1, text.length - 1);
4812        if (nlines > 1) { doc.remove(from.line + 1, nlines - 1); }
4813        doc.insert(from.line + 1, added$2);
4814      }
4815  
4816      signalLater(doc, "change", doc, change);
4817    }
4818  
4819    // Call f for all linked documents.
4820    function linkedDocs(doc, f, sharedHistOnly) {
4821      function propagate(doc, skip, sharedHist) {
4822        if (doc.linked) { for (var i = 0; i < doc.linked.length; ++i) {
4823          var rel = doc.linked[i];
4824          if (rel.doc == skip) { continue }
4825          var shared = sharedHist && rel.sharedHist;
4826          if (sharedHistOnly && !shared) { continue }
4827          f(rel.doc, shared);
4828          propagate(rel.doc, doc, shared);
4829        } }
4830      }
4831      propagate(doc, null, true);
4832    }
4833  
4834    // Attach a document to an editor.
4835    function attachDoc(cm, doc) {
4836      if (doc.cm) { throw new Error("This document is already in use.") }
4837      cm.doc = doc;
4838      doc.cm = cm;
4839      estimateLineHeights(cm);
4840      loadMode(cm);
4841      setDirectionClass(cm);
4842      cm.options.direction = doc.direction;
4843      if (!cm.options.lineWrapping) { findMaxLine(cm); }
4844      cm.options.mode = doc.modeOption;
4845      regChange(cm);
4846    }
4847  
4848    function setDirectionClass(cm) {
4849    (cm.doc.direction == "rtl" ? addClass : rmClass)(cm.display.lineDiv, "CodeMirror-rtl");
4850    }
4851  
4852    function directionChanged(cm) {
4853      runInOp(cm, function () {
4854        setDirectionClass(cm);
4855        regChange(cm);
4856      });
4857    }
4858  
4859    function History(prev) {
4860      // Arrays of change events and selections. Doing something adds an
4861      // event to done and clears undo. Undoing moves events from done
4862      // to undone, redoing moves them in the other direction.
4863      this.done = []; this.undone = [];
4864      this.undoDepth = prev ? prev.undoDepth : Infinity;
4865      // Used to track when changes can be merged into a single undo
4866      // event
4867      this.lastModTime = this.lastSelTime = 0;
4868      this.lastOp = this.lastSelOp = null;
4869      this.lastOrigin = this.lastSelOrigin = null;
4870      // Used by the isClean() method
4871      this.generation = this.maxGeneration = prev ? prev.maxGeneration : 1;
4872    }
4873  
4874    // Create a history change event from an updateDoc-style change
4875    // object.
4876    function historyChangeFromChange(doc, change) {
4877      var histChange = {from: copyPos(change.from), to: changeEnd(change), text: getBetween(doc, change.from, change.to)};
4878      attachLocalSpans(doc, histChange, change.from.line, change.to.line + 1);
4879      linkedDocs(doc, function (doc) { return attachLocalSpans(doc, histChange, change.from.line, change.to.line + 1); }, true);
4880      return histChange
4881    }
4882  
4883    // Pop all selection events off the end of a history array. Stop at
4884    // a change event.
4885    function clearSelectionEvents(array) {
4886      while (array.length) {
4887        var last = lst(array);
4888        if (last.ranges) { array.pop(); }
4889        else { break }
4890      }
4891    }
4892  
4893    // Find the top change event in the history. Pop off selection
4894    // events that are in the way.
4895    function lastChangeEvent(hist, force) {
4896      if (force) {
4897        clearSelectionEvents(hist.done);
4898        return lst(hist.done)
4899      } else if (hist.done.length && !lst(hist.done).ranges) {
4900        return lst(hist.done)
4901      } else if (hist.done.length > 1 && !hist.done[hist.done.length - 2].ranges) {
4902        hist.done.pop();
4903        return lst(hist.done)
4904      }
4905    }
4906  
4907    // Register a change in the history. Merges changes that are within
4908    // a single operation, or are close together with an origin that
4909    // allows merging (starting with "+") into a single event.
4910    function addChangeToHistory(doc, change, selAfter, opId) {
4911      var hist = doc.history;
4912      hist.undone.length = 0;
4913      var time = +new Date, cur;
4914      var last;
4915  
4916      if ((hist.lastOp == opId ||
4917           hist.lastOrigin == change.origin && change.origin &&
4918           ((change.origin.charAt(0) == "+" && hist.lastModTime > time - (doc.cm ? doc.cm.options.historyEventDelay : 500)) ||
4919            change.origin.charAt(0) == "*")) &&
4920          (cur = lastChangeEvent(hist, hist.lastOp == opId))) {
4921        // Merge this change into the last event
4922        last = lst(cur.changes);
4923        if (cmp(change.from, change.to) == 0 && cmp(change.from, last.to) == 0) {
4924          // Optimized case for simple insertion -- don't want to add
4925          // new changesets for every character typed
4926          last.to = changeEnd(change);
4927        } else {
4928          // Add new sub-event
4929          cur.changes.push(historyChangeFromChange(doc, change));
4930        }
4931      } else {
4932        // Can not be merged, start a new event.
4933        var before = lst(hist.done);
4934        if (!before || !before.ranges)
4935          { pushSelectionToHistory(doc.sel, hist.done); }
4936        cur = {changes: [historyChangeFromChange(doc, change)],
4937               generation: hist.generation};
4938        hist.done.push(cur);
4939        while (hist.done.length > hist.undoDepth) {
4940          hist.done.shift();
4941          if (!hist.done[0].ranges) { hist.done.shift(); }
4942        }
4943      }
4944      hist.done.push(selAfter);
4945      hist.generation = ++hist.maxGeneration;
4946      hist.lastModTime = hist.lastSelTime = time;
4947      hist.lastOp = hist.lastSelOp = opId;
4948      hist.lastOrigin = hist.lastSelOrigin = change.origin;
4949  
4950      if (!last) { signal(doc, "historyAdded"); }
4951    }
4952  
4953    function selectionEventCanBeMerged(doc, origin, prev, sel) {
4954      var ch = origin.charAt(0);
4955      return ch == "*" ||
4956        ch == "+" &&
4957        prev.ranges.length == sel.ranges.length &&
4958        prev.somethingSelected() == sel.somethingSelected() &&
4959        new Date - doc.history.lastSelTime <= (doc.cm ? doc.cm.options.historyEventDelay : 500)
4960    }
4961  
4962    // Called whenever the selection changes, sets the new selection as
4963    // the pending selection in the history, and pushes the old pending
4964    // selection into the 'done' array when it was significantly
4965    // different (in number of selected ranges, emptiness, or time).
4966    function addSelectionToHistory(doc, sel, opId, options) {
4967      var hist = doc.history, origin = options && options.origin;
4968  
4969      // A new event is started when the previous origin does not match
4970      // the current, or the origins don't allow matching. Origins
4971      // starting with * are always merged, those starting with + are
4972      // merged when similar and close together in time.
4973      if (opId == hist.lastSelOp ||
4974          (origin && hist.lastSelOrigin == origin &&
4975           (hist.lastModTime == hist.lastSelTime && hist.lastOrigin == origin ||
4976            selectionEventCanBeMerged(doc, origin, lst(hist.done), sel))))
4977        { hist.done[hist.done.length - 1] = sel; }
4978      else
4979        { pushSelectionToHistory(sel, hist.done); }
4980  
4981      hist.lastSelTime = +new Date;
4982      hist.lastSelOrigin = origin;
4983      hist.lastSelOp = opId;
4984      if (options && options.clearRedo !== false)
4985        { clearSelectionEvents(hist.undone); }
4986    }
4987  
4988    function pushSelectionToHistory(sel, dest) {
4989      var top = lst(dest);
4990      if (!(top && top.ranges && top.equals(sel)))
4991        { dest.push(sel); }
4992    }
4993  
4994    // Used to store marked span information in the history.
4995    function attachLocalSpans(doc, change, from, to) {
4996      var existing = change["spans_" + doc.id], n = 0;
4997      doc.iter(Math.max(doc.first, from), Math.min(doc.first + doc.size, to), function (line) {
4998        if (line.markedSpans)
4999          { (existing || (existing = change["spans_" + doc.id] = {}))[n] = line.markedSpans; }
5000        ++n;
5001      });
5002    }
5003  
5004    // When un/re-doing restores text containing marked spans, those
5005    // that have been explicitly cleared should not be restored.
5006    function removeClearedSpans(spans) {
5007      if (!spans) { return null }
5008      var out;
5009      for (var i = 0; i < spans.length; ++i) {
5010        if (spans[i].marker.explicitlyCleared) { if (!out) { out = spans.slice(0, i); } }
5011        else if (out) { out.push(spans[i]); }
5012      }
5013      return !out ? spans : out.length ? out : null
5014    }
5015  
5016    // Retrieve and filter the old marked spans stored in a change event.
5017    function getOldSpans(doc, change) {
5018      var found = change["spans_" + doc.id];
5019      if (!found) { return null }
5020      var nw = [];
5021      for (var i = 0; i < change.text.length; ++i)
5022        { nw.push(removeClearedSpans(found[i])); }
5023      return nw
5024    }
5025  
5026    // Used for un/re-doing changes from the history. Combines the
5027    // result of computing the existing spans with the set of spans that
5028    // existed in the history (so that deleting around a span and then
5029    // undoing brings back the span).
5030    function mergeOldSpans(doc, change) {
5031      var old = getOldSpans(doc, change);
5032      var stretched = stretchSpansOverChange(doc, change);
5033      if (!old) { return stretched }
5034      if (!stretched) { return old }
5035  
5036      for (var i = 0; i < old.length; ++i) {
5037        var oldCur = old[i], stretchCur = stretched[i];
5038        if (oldCur && stretchCur) {
5039          spans: for (var j = 0; j < stretchCur.length; ++j) {
5040            var span = stretchCur[j];
5041            for (var k = 0; k < oldCur.length; ++k)
5042              { if (oldCur[k].marker == span.marker) { continue spans } }
5043            oldCur.push(span);
5044          }
5045        } else if (stretchCur) {
5046          old[i] = stretchCur;
5047        }
5048      }
5049      return old
5050    }
5051  
5052    // Used both to provide a JSON-safe object in .getHistory, and, when
5053    // detaching a document, to split the history in two
5054    function copyHistoryArray(events, newGroup, instantiateSel) {
5055      var copy = [];
5056      for (var i = 0; i < events.length; ++i) {
5057        var event = events[i];
5058        if (event.ranges) {
5059          copy.push(instantiateSel ? Selection.prototype.deepCopy.call(event) : event);
5060          continue
5061        }
5062        var changes = event.changes, newChanges = [];
5063        copy.push({changes: newChanges});
5064        for (var j = 0; j < changes.length; ++j) {
5065          var change = changes[j], m = (void 0);
5066          newChanges.push({from: change.from, to: change.to, text: change.text});
5067          if (newGroup) { for (var prop in change) { if (m = prop.match(/^spans_(\d+)$/)) {
5068            if (indexOf(newGroup, Number(m[1])) > -1) {
5069              lst(newChanges)[prop] = change[prop];
5070              delete change[prop];
5071            }
5072          } } }
5073        }
5074      }
5075      return copy
5076    }
5077  
5078    // The 'scroll' parameter given to many of these indicated whether
5079    // the new cursor position should be scrolled into view after
5080    // modifying the selection.
5081  
5082    // If shift is held or the extend flag is set, extends a range to
5083    // include a given position (and optionally a second position).
5084    // Otherwise, simply returns the range between the given positions.
5085    // Used for cursor motion and such.
5086    function extendRange(range, head, other, extend) {
5087      if (extend) {
5088        var anchor = range.anchor;
5089        if (other) {
5090          var posBefore = cmp(head, anchor) < 0;
5091          if (posBefore != (cmp(other, anchor) < 0)) {
5092            anchor = head;
5093            head = other;
5094          } else if (posBefore != (cmp(head, other) < 0)) {
5095            head = other;
5096          }
5097        }
5098        return new Range(anchor, head)
5099      } else {
5100        return new Range(other || head, head)
5101      }
5102    }
5103  
5104    // Extend the primary selection range, discard the rest.
5105    function extendSelection(doc, head, other, options, extend) {
5106      if (extend == null) { extend = doc.cm && (doc.cm.display.shift || doc.extend); }
5107      setSelection(doc, new Selection([extendRange(doc.sel.primary(), head, other, extend)], 0), options);
5108    }
5109  
5110    // Extend all selections (pos is an array of selections with length
5111    // equal the number of selections)
5112    function extendSelections(doc, heads, options) {
5113      var out = [];
5114      var extend = doc.cm && (doc.cm.display.shift || doc.extend);
5115      for (var i = 0; i < doc.sel.ranges.length; i++)
5116        { out[i] = extendRange(doc.sel.ranges[i], heads[i], null, extend); }
5117      var newSel = normalizeSelection(doc.cm, out, doc.sel.primIndex);
5118      setSelection(doc, newSel, options);
5119    }
5120  
5121    // Updates a single range in the selection.
5122    function replaceOneSelection(doc, i, range, options) {
5123      var ranges = doc.sel.ranges.slice(0);
5124      ranges[i] = range;
5125      setSelection(doc, normalizeSelection(doc.cm, ranges, doc.sel.primIndex), options);
5126    }
5127  
5128    // Reset the selection to a single range.
5129    function setSimpleSelection(doc, anchor, head, options) {
5130      setSelection(doc, simpleSelection(anchor, head), options);
5131    }
5132  
5133    // Give beforeSelectionChange handlers a change to influence a
5134    // selection update.
5135    function filterSelectionChange(doc, sel, options) {
5136      var obj = {
5137        ranges: sel.ranges,
5138        update: function(ranges) {
5139          this.ranges = [];
5140          for (var i = 0; i < ranges.length; i++)
5141            { this.ranges[i] = new Range(clipPos(doc, ranges[i].anchor),
5142                                       clipPos(doc, ranges[i].head)); }
5143        },
5144        origin: options && options.origin
5145      };
5146      signal(doc, "beforeSelectionChange", doc, obj);
5147      if (doc.cm) { signal(doc.cm, "beforeSelectionChange", doc.cm, obj); }
5148      if (obj.ranges != sel.ranges) { return normalizeSelection(doc.cm, obj.ranges, obj.ranges.length - 1) }
5149      else { return sel }
5150    }
5151  
5152    function setSelectionReplaceHistory(doc, sel, options) {
5153      var done = doc.history.done, last = lst(done);
5154      if (last && last.ranges) {
5155        done[done.length - 1] = sel;
5156        setSelectionNoUndo(doc, sel, options);
5157      } else {
5158        setSelection(doc, sel, options);
5159      }
5160    }
5161  
5162    // Set a new selection.
5163    function setSelection(doc, sel, options) {
5164      setSelectionNoUndo(doc, sel, options);
5165      addSelectionToHistory(doc, doc.sel, doc.cm ? doc.cm.curOp.id : NaN, options);
5166    }
5167  
5168    function setSelectionNoUndo(doc, sel, options) {
5169      if (hasHandler(doc, "beforeSelectionChange") || doc.cm && hasHandler(doc.cm, "beforeSelectionChange"))
5170        { sel = filterSelectionChange(doc, sel, options); }
5171  
5172      var bias = options && options.bias ||
5173        (cmp(sel.primary().head, doc.sel.primary().head) < 0 ? -1 : 1);
5174      setSelectionInner(doc, skipAtomicInSelection(doc, sel, bias, true));
5175  
5176      if (!(options && options.scroll === false) && doc.cm && doc.cm.getOption("readOnly") != "nocursor")
5177        { ensureCursorVisible(doc.cm); }
5178    }
5179  
5180    function setSelectionInner(doc, sel) {
5181      if (sel.equals(doc.sel)) { return }
5182  
5183      doc.sel = sel;
5184  
5185      if (doc.cm) {
5186        doc.cm.curOp.updateInput = 1;
5187        doc.cm.curOp.selectionChanged = true;
5188        signalCursorActivity(doc.cm);
5189      }
5190      signalLater(doc, "cursorActivity", doc);
5191    }
5192  
5193    // Verify that the selection does not partially select any atomic
5194    // marked ranges.
5195    function reCheckSelection(doc) {
5196      setSelectionInner(doc, skipAtomicInSelection(doc, doc.sel, null, false));
5197    }
5198  
5199    // Return a selection that does not partially select any atomic
5200    // ranges.
5201    function skipAtomicInSelection(doc, sel, bias, mayClear) {
5202      var out;
5203      for (var i = 0; i < sel.ranges.length; i++) {
5204        var range = sel.ranges[i];
5205        var old = sel.ranges.length == doc.sel.ranges.length && doc.sel.ranges[i];
5206        var newAnchor = skipAtomic(doc, range.anchor, old && old.anchor, bias, mayClear);
5207        var newHead = range.head == range.anchor ? newAnchor : skipAtomic(doc, range.head, old && old.head, bias, mayClear);
5208        if (out || newAnchor != range.anchor || newHead != range.head) {
5209          if (!out) { out = sel.ranges.slice(0, i); }
5210          out[i] = new Range(newAnchor, newHead);
5211        }
5212      }
5213      return out ? normalizeSelection(doc.cm, out, sel.primIndex) : sel
5214    }
5215  
5216    function skipAtomicInner(doc, pos, oldPos, dir, mayClear) {
5217      var line = getLine(doc, pos.line);
5218      if (line.markedSpans) { for (var i = 0; i < line.markedSpans.length; ++i) {
5219        var sp = line.markedSpans[i], m = sp.marker;
5220  
5221        // Determine if we should prevent the cursor being placed to the left/right of an atomic marker
5222        // Historically this was determined using the inclusiveLeft/Right option, but the new way to control it
5223        // is with selectLeft/Right
5224        var preventCursorLeft = ("selectLeft" in m) ? !m.selectLeft : m.inclusiveLeft;
5225        var preventCursorRight = ("selectRight" in m) ? !m.selectRight : m.inclusiveRight;
5226  
5227        if ((sp.from == null || (preventCursorLeft ? sp.from <= pos.ch : sp.from < pos.ch)) &&
5228            (sp.to == null || (preventCursorRight ? sp.to >= pos.ch : sp.to > pos.ch))) {
5229          if (mayClear) {
5230            signal(m, "beforeCursorEnter");
5231            if (m.explicitlyCleared) {
5232              if (!line.markedSpans) { break }
5233              else {--i; continue}
5234            }
5235          }
5236          if (!m.atomic) { continue }
5237  
5238          if (oldPos) {
5239            var near = m.find(dir < 0 ? 1 : -1), diff = (void 0);
5240            if (dir < 0 ? preventCursorRight : preventCursorLeft)
5241              { near = movePos(doc, near, -dir, near && near.line == pos.line ? line : null); }
5242            if (near && near.line == pos.line && (diff = cmp(near, oldPos)) && (dir < 0 ? diff < 0 : diff > 0))
5243              { return skipAtomicInner(doc, near, pos, dir, mayClear) }
5244          }
5245  
5246          var far = m.find(dir < 0 ? -1 : 1);
5247          if (dir < 0 ? preventCursorLeft : preventCursorRight)
5248            { far = movePos(doc, far, dir, far.line == pos.line ? line : null); }
5249          return far ? skipAtomicInner(doc, far, pos, dir, mayClear) : null
5250        }
5251      } }
5252      return pos
5253    }
5254  
5255    // Ensure a given position is not inside an atomic range.
5256    function skipAtomic(doc, pos, oldPos, bias, mayClear) {
5257      var dir = bias || 1;
5258      var found = skipAtomicInner(doc, pos, oldPos, dir, mayClear) ||
5259          (!mayClear && skipAtomicInner(doc, pos, oldPos, dir, true)) ||
5260          skipAtomicInner(doc, pos, oldPos, -dir, mayClear) ||
5261          (!mayClear && skipAtomicInner(doc, pos, oldPos, -dir, true));
5262      if (!found) {
5263        doc.cantEdit = true;
5264        return Pos(doc.first, 0)
5265      }
5266      return found
5267    }
5268  
5269    function movePos(doc, pos, dir, line) {
5270      if (dir < 0 && pos.ch == 0) {
5271        if (pos.line > doc.first) { return clipPos(doc, Pos(pos.line - 1)) }
5272        else { return null }
5273      } else if (dir > 0 && pos.ch == (line || getLine(doc, pos.line)).text.length) {
5274        if (pos.line < doc.first + doc.size - 1) { return Pos(pos.line + 1, 0) }
5275        else { return null }
5276      } else {
5277        return new Pos(pos.line, pos.ch + dir)
5278      }
5279    }
5280  
5281    function selectAll(cm) {
5282      cm.setSelection(Pos(cm.firstLine(), 0), Pos(cm.lastLine()), sel_dontScroll);
5283    }
5284  
5285    // UPDATING
5286  
5287    // Allow "beforeChange" event handlers to influence a change
5288    function filterChange(doc, change, update) {
5289      var obj = {
5290        canceled: false,
5291        from: change.from,
5292        to: change.to,
5293        text: change.text,
5294        origin: change.origin,
5295        cancel: function () { return obj.canceled = true; }
5296      };
5297      if (update) { obj.update = function (from, to, text, origin) {
5298        if (from) { obj.from = clipPos(doc, from); }
5299        if (to) { obj.to = clipPos(doc, to); }
5300        if (text) { obj.text = text; }
5301        if (origin !== undefined) { obj.origin = origin; }
5302      }; }
5303      signal(doc, "beforeChange", doc, obj);
5304      if (doc.cm) { signal(doc.cm, "beforeChange", doc.cm, obj); }
5305  
5306      if (obj.canceled) {
5307        if (doc.cm) { doc.cm.curOp.updateInput = 2; }
5308        return null
5309      }
5310      return {from: obj.from, to: obj.to, text: obj.text, origin: obj.origin}
5311    }
5312  
5313    // Apply a change to a document, and add it to the document's
5314    // history, and propagating it to all linked documents.
5315    function makeChange(doc, change, ignoreReadOnly) {
5316      if (doc.cm) {
5317        if (!doc.cm.curOp) { return operation(doc.cm, makeChange)(doc, change, ignoreReadOnly) }
5318        if (doc.cm.state.suppressEdits) { return }
5319      }
5320  
5321      if (hasHandler(doc, "beforeChange") || doc.cm && hasHandler(doc.cm, "beforeChange")) {
5322        change = filterChange(doc, change, true);
5323        if (!change) { return }
5324      }
5325  
5326      // Possibly split or suppress the update based on the presence
5327      // of read-only spans in its range.
5328      var split = sawReadOnlySpans && !ignoreReadOnly && removeReadOnlyRanges(doc, change.from, change.to);
5329      if (split) {
5330        for (var i = split.length - 1; i >= 0; --i)
5331          { makeChangeInner(doc, {from: split[i].from, to: split[i].to, text: i ? [""] : change.text, origin: change.origin}); }
5332      } else {
5333        makeChangeInner(doc, change);
5334      }
5335    }
5336  
5337    function makeChangeInner(doc, change) {
5338      if (change.text.length == 1 && change.text[0] == "" && cmp(change.from, change.to) == 0) { return }
5339      var selAfter = computeSelAfterChange(doc, change);
5340      addChangeToHistory(doc, change, selAfter, doc.cm ? doc.cm.curOp.id : NaN);
5341  
5342      makeChangeSingleDoc(doc, change, selAfter, stretchSpansOverChange(doc, change));
5343      var rebased = [];
5344  
5345      linkedDocs(doc, function (doc, sharedHist) {
5346        if (!sharedHist && indexOf(rebased, doc.history) == -1) {
5347          rebaseHist(doc.history, change);
5348          rebased.push(doc.history);
5349        }
5350        makeChangeSingleDoc(doc, change, null, stretchSpansOverChange(doc, change));
5351      });
5352    }
5353  
5354    // Revert a change stored in a document's history.
5355    function makeChangeFromHistory(doc, type, allowSelectionOnly) {
5356      var suppress = doc.cm && doc.cm.state.suppressEdits;
5357      if (suppress && !allowSelectionOnly) { return }
5358  
5359      var hist = doc.history, event, selAfter = doc.sel;
5360      var source = type == "undo" ? hist.done : hist.undone, dest = type == "undo" ? hist.undone : hist.done;
5361  
5362      // Verify that there is a useable event (so that ctrl-z won't
5363      // needlessly clear selection events)
5364      var i = 0;
5365      for (; i < source.length; i++) {
5366        event = source[i];
5367        if (allowSelectionOnly ? event.ranges && !event.equals(doc.sel) : !event.ranges)
5368          { break }
5369      }
5370      if (i == source.length) { return }
5371      hist.lastOrigin = hist.lastSelOrigin = null;
5372  
5373      for (;;) {
5374        event = source.pop();
5375        if (event.ranges) {
5376          pushSelectionToHistory(event, dest);
5377          if (allowSelectionOnly && !event.equals(doc.sel)) {
5378            setSelection(doc, event, {clearRedo: false});
5379            return
5380          }
5381          selAfter = event;
5382        } else if (suppress) {
5383          source.push(event);
5384          return
5385        } else { break }
5386      }
5387  
5388      // Build up a reverse change object to add to the opposite history
5389      // stack (redo when undoing, and vice versa).
5390      var antiChanges = [];
5391      pushSelectionToHistory(selAfter, dest);
5392      dest.push({changes: antiChanges, generation: hist.generation});
5393      hist.generation = event.generation || ++hist.maxGeneration;
5394  
5395      var filter = hasHandler(doc, "beforeChange") || doc.cm && hasHandler(doc.cm, "beforeChange");
5396  
5397      var loop = function ( i ) {
5398        var change = event.changes[i];
5399        change.origin = type;
5400        if (filter && !filterChange(doc, change, false)) {
5401          source.length = 0;
5402          return {}
5403        }
5404  
5405        antiChanges.push(historyChangeFromChange(doc, change));
5406  
5407        var after = i ? computeSelAfterChange(doc, change) : lst(source);
5408        makeChangeSingleDoc(doc, change, after, mergeOldSpans(doc, change));
5409        if (!i && doc.cm) { doc.cm.scrollIntoView({from: change.from, to: changeEnd(change)}); }
5410        var rebased = [];
5411  
5412        // Propagate to the linked documents
5413        linkedDocs(doc, function (doc, sharedHist) {
5414          if (!sharedHist && indexOf(rebased, doc.history) == -1) {
5415            rebaseHist(doc.history, change);
5416            rebased.push(doc.history);
5417          }
5418          makeChangeSingleDoc(doc, change, null, mergeOldSpans(doc, change));
5419        });
5420      };
5421  
5422      for (var i$1 = event.changes.length - 1; i$1 >= 0; --i$1) {
5423        var returned = loop( i$1 );
5424  
5425        if ( returned ) return returned.v;
5426      }
5427    }
5428  
5429    // Sub-views need their line numbers shifted when text is added
5430    // above or below them in the parent document.
5431    function shiftDoc(doc, distance) {
5432      if (distance == 0) { return }
5433      doc.first += distance;
5434      doc.sel = new Selection(map(doc.sel.ranges, function (range) { return new Range(
5435        Pos(range.anchor.line + distance, range.anchor.ch),
5436        Pos(range.head.line + distance, range.head.ch)
5437      ); }), doc.sel.primIndex);
5438      if (doc.cm) {
5439        regChange(doc.cm, doc.first, doc.first - distance, distance);
5440        for (var d = doc.cm.display, l = d.viewFrom; l < d.viewTo; l++)
5441          { regLineChange(doc.cm, l, "gutter"); }
5442      }
5443    }
5444  
5445    // More lower-level change function, handling only a single document
5446    // (not linked ones).
5447    function makeChangeSingleDoc(doc, change, selAfter, spans) {
5448      if (doc.cm && !doc.cm.curOp)
5449        { return operation(doc.cm, makeChangeSingleDoc)(doc, change, selAfter, spans) }
5450  
5451      if (change.to.line < doc.first) {
5452        shiftDoc(doc, change.text.length - 1 - (change.to.line - change.from.line));
5453        return
5454      }
5455      if (change.from.line > doc.lastLine()) { return }
5456  
5457      // Clip the change to the size of this doc
5458      if (change.from.line < doc.first) {
5459        var shift = change.text.length - 1 - (doc.first - change.from.line);
5460        shiftDoc(doc, shift);
5461        change = {from: Pos(doc.first, 0), to: Pos(change.to.line + shift, change.to.ch),
5462                  text: [lst(change.text)], origin: change.origin};
5463      }
5464      var last = doc.lastLine();
5465      if (change.to.line > last) {
5466        change = {from: change.from, to: Pos(last, getLine(doc, last).text.length),
5467                  text: [change.text[0]], origin: change.origin};
5468      }
5469  
5470      change.removed = getBetween(doc, change.from, change.to);
5471  
5472      if (!selAfter) { selAfter = computeSelAfterChange(doc, change); }
5473      if (doc.cm) { makeChangeSingleDocInEditor(doc.cm, change, spans); }
5474      else { updateDoc(doc, change, spans); }
5475      setSelectionNoUndo(doc, selAfter, sel_dontScroll);
5476  
5477      if (doc.cantEdit && skipAtomic(doc, Pos(doc.firstLine(), 0)))
5478        { doc.cantEdit = false; }
5479    }
5480  
5481    // Handle the interaction of a change to a document with the editor
5482    // that this document is part of.
5483    function makeChangeSingleDocInEditor(cm, change, spans) {
5484      var doc = cm.doc, display = cm.display, from = change.from, to = change.to;
5485  
5486      var recomputeMaxLength = false, checkWidthStart = from.line;
5487      if (!cm.options.lineWrapping) {
5488        checkWidthStart = lineNo(visualLine(getLine(doc, from.line)));
5489        doc.iter(checkWidthStart, to.line + 1, function (line) {
5490          if (line == display.maxLine) {
5491            recomputeMaxLength = true;
5492            return true
5493          }
5494        });
5495      }
5496  
5497      if (doc.sel.contains(change.from, change.to) > -1)
5498        { signalCursorActivity(cm); }
5499  
5500      updateDoc(doc, change, spans, estimateHeight(cm));
5501  
5502      if (!cm.options.lineWrapping) {
5503        doc.iter(checkWidthStart, from.line + change.text.length, function (line) {
5504          var len = lineLength(line);
5505          if (len > display.maxLineLength) {
5506            display.maxLine = line;
5507            display.maxLineLength = len;
5508            display.maxLineChanged = true;
5509            recomputeMaxLength = false;
5510          }
5511        });
5512        if (recomputeMaxLength) { cm.curOp.updateMaxLine = true; }
5513      }
5514  
5515      retreatFrontier(doc, from.line);
5516      startWorker(cm, 400);
5517  
5518      var lendiff = change.text.length - (to.line - from.line) - 1;
5519      // Remember that these lines changed, for updating the display
5520      if (change.full)
5521        { regChange(cm); }
5522      else if (from.line == to.line && change.text.length == 1 && !isWholeLineUpdate(cm.doc, change))
5523        { regLineChange(cm, from.line, "text"); }
5524      else
5525        { regChange(cm, from.line, to.line + 1, lendiff); }
5526  
5527      var changesHandler = hasHandler(cm, "changes"), changeHandler = hasHandler(cm, "change");
5528      if (changeHandler || changesHandler) {
5529        var obj = {
5530          from: from, to: to,
5531          text: change.text,
5532          removed: change.removed,
5533          origin: change.origin
5534        };
5535        if (changeHandler) { signalLater(cm, "change", cm, obj); }
5536        if (changesHandler) { (cm.curOp.changeObjs || (cm.curOp.changeObjs = [])).push(obj); }
5537      }
5538      cm.display.selForContextMenu = null;
5539    }
5540  
5541    function replaceRange(doc, code, from, to, origin) {
5542      var assign;
5543  
5544      if (!to) { to = from; }
5545      if (cmp(to, from) < 0) { (assign = [to, from], from = assign[0], to = assign[1]); }
5546      if (typeof code == "string") { code = doc.splitLines(code); }
5547      makeChange(doc, {from: from, to: to, text: code, origin: origin});
5548    }
5549  
5550    // Rebasing/resetting history to deal with externally-sourced changes
5551  
5552    function rebaseHistSelSingle(pos, from, to, diff) {
5553      if (to < pos.line) {
5554        pos.line += diff;
5555      } else if (from < pos.line) {
5556        pos.line = from;
5557        pos.ch = 0;
5558      }
5559    }
5560  
5561    // Tries to rebase an array of history events given a change in the
5562    // document. If the change touches the same lines as the event, the
5563    // event, and everything 'behind' it, is discarded. If the change is
5564    // before the event, the event's positions are updated. Uses a
5565    // copy-on-write scheme for the positions, to avoid having to
5566    // reallocate them all on every rebase, but also avoid problems with
5567    // shared position objects being unsafely updated.
5568    function rebaseHistArray(array, from, to, diff) {
5569      for (var i = 0; i < array.length; ++i) {
5570        var sub = array[i], ok = true;
5571        if (sub.ranges) {
5572          if (!sub.copied) { sub = array[i] = sub.deepCopy(); sub.copied = true; }
5573          for (var j = 0; j < sub.ranges.length; j++) {
5574            rebaseHistSelSingle(sub.ranges[j].anchor, from, to, diff);
5575            rebaseHistSelSingle(sub.ranges[j].head, from, to, diff);
5576          }
5577          continue
5578        }
5579        for (var j$1 = 0; j$1 < sub.changes.length; ++j$1) {
5580          var cur = sub.changes[j$1];
5581          if (to < cur.from.line) {
5582            cur.from = Pos(cur.from.line + diff, cur.from.ch);
5583            cur.to = Pos(cur.to.line + diff, cur.to.ch);
5584          } else if (from <= cur.to.line) {
5585            ok = false;
5586            break
5587          }
5588        }
5589        if (!ok) {
5590          array.splice(0, i + 1);
5591          i = 0;
5592        }
5593      }
5594    }
5595  
5596    function rebaseHist(hist, change) {
5597      var from = change.from.line, to = change.to.line, diff = change.text.length - (to - from) - 1;
5598      rebaseHistArray(hist.done, from, to, diff);
5599      rebaseHistArray(hist.undone, from, to, diff);
5600    }
5601  
5602    // Utility for applying a change to a line by handle or number,
5603    // returning the number and optionally registering the line as
5604    // changed.
5605    function changeLine(doc, handle, changeType, op) {
5606      var no = handle, line = handle;
5607      if (typeof handle == "number") { line = getLine(doc, clipLine(doc, handle)); }
5608      else { no = lineNo(handle); }
5609      if (no == null) { return null }
5610      if (op(line, no) && doc.cm) { regLineChange(doc.cm, no, changeType); }
5611      return line
5612    }
5613  
5614    // The document is represented as a BTree consisting of leaves, with
5615    // chunk of lines in them, and branches, with up to ten leaves or
5616    // other branch nodes below them. The top node is always a branch
5617    // node, and is the document object itself (meaning it has
5618    // additional methods and properties).
5619    //
5620    // All nodes have parent links. The tree is used both to go from
5621    // line numbers to line objects, and to go from objects to numbers.
5622    // It also indexes by height, and is used to convert between height
5623    // and line object, and to find the total height of the document.
5624    //
5625    // See also http://marijnhaverbeke.nl/blog/codemirror-line-tree.html
5626  
5627    function LeafChunk(lines) {
5628      this.lines = lines;
5629      this.parent = null;
5630      var height = 0;
5631      for (var i = 0; i < lines.length; ++i) {
5632        lines[i].parent = this;
5633        height += lines[i].height;
5634      }
5635      this.height = height;
5636    }
5637  
5638    LeafChunk.prototype = {
5639      chunkSize: function() { return this.lines.length },
5640  
5641      // Remove the n lines at offset 'at'.
5642      removeInner: function(at, n) {
5643        for (var i = at, e = at + n; i < e; ++i) {
5644          var line = this.lines[i];
5645          this.height -= line.height;
5646          cleanUpLine(line);
5647          signalLater(line, "delete");
5648        }
5649        this.lines.splice(at, n);
5650      },
5651  
5652      // Helper used to collapse a small branch into a single leaf.
5653      collapse: function(lines) {
5654        lines.push.apply(lines, this.lines);
5655      },
5656  
5657      // Insert the given array of lines at offset 'at', count them as
5658      // having the given height.
5659      insertInner: function(at, lines, height) {
5660        this.height += height;
5661        this.lines = this.lines.slice(0, at).concat(lines).concat(this.lines.slice(at));
5662        for (var i = 0; i < lines.length; ++i) { lines[i].parent = this; }
5663      },
5664  
5665      // Used to iterate over a part of the tree.
5666      iterN: function(at, n, op) {
5667        for (var e = at + n; at < e; ++at)
5668          { if (op(this.lines[at])) { return true } }
5669      }
5670    };
5671  
5672    function BranchChunk(children) {
5673      this.children = children;
5674      var size = 0, height = 0;
5675      for (var i = 0; i < children.length; ++i) {
5676        var ch = children[i];
5677        size += ch.chunkSize(); height += ch.height;
5678        ch.parent = this;
5679      }
5680      this.size = size;
5681      this.height = height;
5682      this.parent = null;
5683    }
5684  
5685    BranchChunk.prototype = {
5686      chunkSize: function() { return this.size },
5687  
5688      removeInner: function(at, n) {
5689        this.size -= n;
5690        for (var i = 0; i < this.children.length; ++i) {
5691          var child = this.children[i], sz = child.chunkSize();
5692          if (at < sz) {
5693            var rm = Math.min(n, sz - at), oldHeight = child.height;
5694            child.removeInner(at, rm);
5695            this.height -= oldHeight - child.height;
5696            if (sz == rm) { this.children.splice(i--, 1); child.parent = null; }
5697            if ((n -= rm) == 0) { break }
5698            at = 0;
5699          } else { at -= sz; }
5700        }
5701        // If the result is smaller than 25 lines, ensure that it is a
5702        // single leaf node.
5703        if (this.size - n < 25 &&
5704            (this.children.length > 1 || !(this.children[0] instanceof LeafChunk))) {
5705          var lines = [];
5706          this.collapse(lines);
5707          this.children = [new LeafChunk(lines)];
5708          this.children[0].parent = this;
5709        }
5710      },
5711  
5712      collapse: function(lines) {
5713        for (var i = 0; i < this.children.length; ++i) { this.children[i].collapse(lines); }
5714      },
5715  
5716      insertInner: function(at, lines, height) {
5717        this.size += lines.length;
5718        this.height += height;
5719        for (var i = 0; i < this.children.length; ++i) {
5720          var child = this.children[i], sz = child.chunkSize();
5721          if (at <= sz) {
5722            child.insertInner(at, lines, height);
5723            if (child.lines && child.lines.length > 50) {
5724              // To avoid memory thrashing when child.lines is huge (e.g. first view of a large file), it's never spliced.
5725              // Instead, small slices are taken. They're taken in order because sequential memory accesses are fastest.
5726              var remaining = child.lines.length % 25 + 25;
5727              for (var pos = remaining; pos < child.lines.length;) {
5728                var leaf = new LeafChunk(child.lines.slice(pos, pos += 25));
5729                child.height -= leaf.height;
5730                this.children.splice(++i, 0, leaf);
5731                leaf.parent = this;
5732              }
5733              child.lines = child.lines.slice(0, remaining);
5734              this.maybeSpill();
5735            }
5736            break
5737          }
5738          at -= sz;
5739        }
5740      },
5741  
5742      // When a node has grown, check whether it should be split.
5743      maybeSpill: function() {
5744        if (this.children.length <= 10) { return }
5745        var me = this;
5746        do {
5747          var spilled = me.children.splice(me.children.length - 5, 5);
5748          var sibling = new BranchChunk(spilled);
5749          if (!me.parent) { // Become the parent node
5750            var copy = new BranchChunk(me.children);
5751            copy.parent = me;
5752            me.children = [copy, sibling];
5753            me = copy;
5754         } else {
5755            me.size -= sibling.size;
5756            me.height -= sibling.height;
5757            var myIndex = indexOf(me.parent.children, me);
5758            me.parent.children.splice(myIndex + 1, 0, sibling);
5759          }
5760          sibling.parent = me.parent;
5761        } while (me.children.length > 10)
5762        me.parent.maybeSpill();
5763      },
5764  
5765      iterN: function(at, n, op) {
5766        for (var i = 0; i < this.children.length; ++i) {
5767          var child = this.children[i], sz = child.chunkSize();
5768          if (at < sz) {
5769            var used = Math.min(n, sz - at);
5770            if (child.iterN(at, used, op)) { return true }
5771            if ((n -= used) == 0) { break }
5772            at = 0;
5773          } else { at -= sz; }
5774        }
5775      }
5776    };
5777  
5778    // Line widgets are block elements displayed above or below a line.
5779  
5780    var LineWidget = function(doc, node, options) {
5781      if (options) { for (var opt in options) { if (options.hasOwnProperty(opt))
5782        { this[opt] = options[opt]; } } }
5783      this.doc = doc;
5784      this.node = node;
5785    };
5786  
5787    LineWidget.prototype.clear = function () {
5788      var cm = this.doc.cm, ws = this.line.widgets, line = this.line, no = lineNo(line);
5789      if (no == null || !ws) { return }
5790      for (var i = 0; i < ws.length; ++i) { if (ws[i] == this) { ws.splice(i--, 1); } }
5791      if (!ws.length) { line.widgets = null; }
5792      var height = widgetHeight(this);
5793      updateLineHeight(line, Math.max(0, line.height - height));
5794      if (cm) {
5795        runInOp(cm, function () {
5796          adjustScrollWhenAboveVisible(cm, line, -height);
5797          regLineChange(cm, no, "widget");
5798        });
5799        signalLater(cm, "lineWidgetCleared", cm, this, no);
5800      }
5801    };
5802  
5803    LineWidget.prototype.changed = function () {
5804        var this$1 = this;
5805  
5806      var oldH = this.height, cm = this.doc.cm, line = this.line;
5807      this.height = null;
5808      var diff = widgetHeight(this) - oldH;
5809      if (!diff) { return }
5810      if (!lineIsHidden(this.doc, line)) { updateLineHeight(line, line.height + diff); }
5811      if (cm) {
5812        runInOp(cm, function () {
5813          cm.curOp.forceUpdate = true;
5814          adjustScrollWhenAboveVisible(cm, line, diff);
5815          signalLater(cm, "lineWidgetChanged", cm, this$1, lineNo(line));
5816        });
5817      }
5818    };
5819    eventMixin(LineWidget);
5820  
5821    function adjustScrollWhenAboveVisible(cm, line, diff) {
5822      if (heightAtLine(line) < ((cm.curOp && cm.curOp.scrollTop) || cm.doc.scrollTop))
5823        { addToScrollTop(cm, diff); }
5824    }
5825  
5826    function addLineWidget(doc, handle, node, options) {
5827      var widget = new LineWidget(doc, node, options);
5828      var cm = doc.cm;
5829      if (cm && widget.noHScroll) { cm.display.alignWidgets = true; }
5830      changeLine(doc, handle, "widget", function (line) {
5831        var widgets = line.widgets || (line.widgets = []);
5832        if (widget.insertAt == null) { widgets.push(widget); }
5833        else { widgets.splice(Math.min(widgets.length, Math.max(0, widget.insertAt)), 0, widget); }
5834        widget.line = line;
5835        if (cm && !lineIsHidden(doc, line)) {
5836          var aboveVisible = heightAtLine(line) < doc.scrollTop;
5837          updateLineHeight(line, line.height + widgetHeight(widget));
5838          if (aboveVisible) { addToScrollTop(cm, widget.height); }
5839          cm.curOp.forceUpdate = true;
5840        }
5841        return true
5842      });
5843      if (cm) { signalLater(cm, "lineWidgetAdded", cm, widget, typeof handle == "number" ? handle : lineNo(handle)); }
5844      return widget
5845    }
5846  
5847    // TEXTMARKERS
5848  
5849    // Created with markText and setBookmark methods. A TextMarker is a
5850    // handle that can be used to clear or find a marked position in the
5851    // document. Line objects hold arrays (markedSpans) containing
5852    // {from, to, marker} object pointing to such marker objects, and
5853    // indicating that such a marker is present on that line. Multiple
5854    // lines may point to the same marker when it spans across lines.
5855    // The spans will have null for their from/to properties when the
5856    // marker continues beyond the start/end of the line. Markers have
5857    // links back to the lines they currently touch.
5858  
5859    // Collapsed markers have unique ids, in order to be able to order
5860    // them, which is needed for uniquely determining an outer marker
5861    // when they overlap (they may nest, but not partially overlap).
5862    var nextMarkerId = 0;
5863  
5864    var TextMarker = function(doc, type) {
5865      this.lines = [];
5866      this.type = type;
5867      this.doc = doc;
5868      this.id = ++nextMarkerId;
5869    };
5870  
5871    // Clear the marker.
5872    TextMarker.prototype.clear = function () {
5873      if (this.explicitlyCleared) { return }
5874      var cm = this.doc.cm, withOp = cm && !cm.curOp;
5875      if (withOp) { startOperation(cm); }
5876      if (hasHandler(this, "clear")) {
5877        var found = this.find();
5878        if (found) { signalLater(this, "clear", found.from, found.to); }
5879      }
5880      var min = null, max = null;
5881      for (var i = 0; i < this.lines.length; ++i) {
5882        var line = this.lines[i];
5883        var span = getMarkedSpanFor(line.markedSpans, this);
5884        if (cm && !this.collapsed) { regLineChange(cm, lineNo(line), "text"); }
5885        else if (cm) {
5886          if (span.to != null) { max = lineNo(line); }
5887          if (span.from != null) { min = lineNo(line); }
5888        }
5889        line.markedSpans = removeMarkedSpan(line.markedSpans, span);
5890        if (span.from == null && this.collapsed && !lineIsHidden(this.doc, line) && cm)
5891          { updateLineHeight(line, textHeight(cm.display)); }
5892      }
5893      if (cm && this.collapsed && !cm.options.lineWrapping) { for (var i$1 = 0; i$1 < this.lines.length; ++i$1) {
5894        var visual = visualLine(this.lines[i$1]), len = lineLength(visual);
5895        if (len > cm.display.maxLineLength) {
5896          cm.display.maxLine = visual;
5897          cm.display.maxLineLength = len;
5898          cm.display.maxLineChanged = true;
5899        }
5900      } }
5901  
5902      if (min != null && cm && this.collapsed) { regChange(cm, min, max + 1); }
5903      this.lines.length = 0;
5904      this.explicitlyCleared = true;
5905      if (this.atomic && this.doc.cantEdit) {
5906        this.doc.cantEdit = false;
5907        if (cm) { reCheckSelection(cm.doc); }
5908      }
5909      if (cm) { signalLater(cm, "markerCleared", cm, this, min, max); }
5910      if (withOp) { endOperation(cm); }
5911      if (this.parent) { this.parent.clear(); }
5912    };
5913  
5914    // Find the position of the marker in the document. Returns a {from,
5915    // to} object by default. Side can be passed to get a specific side
5916    // -- 0 (both), -1 (left), or 1 (right). When lineObj is true, the
5917    // Pos objects returned contain a line object, rather than a line
5918    // number (used to prevent looking up the same line twice).
5919    TextMarker.prototype.find = function (side, lineObj) {
5920      if (side == null && this.type == "bookmark") { side = 1; }
5921      var from, to;
5922      for (var i = 0; i < this.lines.length; ++i) {
5923        var line = this.lines[i];
5924        var span = getMarkedSpanFor(line.markedSpans, this);
5925        if (span.from != null) {
5926          from = Pos(lineObj ? line : lineNo(line), span.from);
5927          if (side == -1) { return from }
5928        }
5929        if (span.to != null) {
5930          to = Pos(lineObj ? line : lineNo(line), span.to);
5931          if (side == 1) { return to }
5932        }
5933      }
5934      return from && {from: from, to: to}
5935    };
5936  
5937    // Signals that the marker's widget changed, and surrounding layout
5938    // should be recomputed.
5939    TextMarker.prototype.changed = function () {
5940        var this$1 = this;
5941  
5942      var pos = this.find(-1, true), widget = this, cm = this.doc.cm;
5943      if (!pos || !cm) { return }
5944      runInOp(cm, function () {
5945        var line = pos.line, lineN = lineNo(pos.line);
5946        var view = findViewForLine(cm, lineN);
5947        if (view) {
5948          clearLineMeasurementCacheFor(view);
5949          cm.curOp.selectionChanged = cm.curOp.forceUpdate = true;
5950        }
5951        cm.curOp.updateMaxLine = true;
5952        if (!lineIsHidden(widget.doc, line) && widget.height != null) {
5953          var oldHeight = widget.height;
5954          widget.height = null;
5955          var dHeight = widgetHeight(widget) - oldHeight;
5956          if (dHeight)
5957            { updateLineHeight(line, line.height + dHeight); }
5958        }
5959        signalLater(cm, "markerChanged", cm, this$1);
5960      });
5961    };
5962  
5963    TextMarker.prototype.attachLine = function (line) {
5964      if (!this.lines.length && this.doc.cm) {
5965        var op = this.doc.cm.curOp;
5966        if (!op.maybeHiddenMarkers || indexOf(op.maybeHiddenMarkers, this) == -1)
5967          { (op.maybeUnhiddenMarkers || (op.maybeUnhiddenMarkers = [])).push(this); }
5968      }
5969      this.lines.push(line);
5970    };
5971  
5972    TextMarker.prototype.detachLine = function (line) {
5973      this.lines.splice(indexOf(this.lines, line), 1);
5974      if (!this.lines.length && this.doc.cm) {
5975        var op = this.doc.cm.curOp
5976        ;(op.maybeHiddenMarkers || (op.maybeHiddenMarkers = [])).push(this);
5977      }
5978    };
5979    eventMixin(TextMarker);
5980  
5981    // Create a marker, wire it up to the right lines, and
5982    function markText(doc, from, to, options, type) {
5983      // Shared markers (across linked documents) are handled separately
5984      // (markTextShared will call out to this again, once per
5985      // document).
5986      if (options && options.shared) { return markTextShared(doc, from, to, options, type) }
5987      // Ensure we are in an operation.
5988      if (doc.cm && !doc.cm.curOp) { return operation(doc.cm, markText)(doc, from, to, options, type) }
5989  
5990      var marker = new TextMarker(doc, type), diff = cmp(from, to);
5991      if (options) { copyObj(options, marker, false); }
5992      // Don't connect empty markers unless clearWhenEmpty is false
5993      if (diff > 0 || diff == 0 && marker.clearWhenEmpty !== false)
5994        { return marker }
5995      if (marker.replacedWith) {
5996        // Showing up as a widget implies collapsed (widget replaces text)
5997        marker.collapsed = true;
5998        marker.widgetNode = eltP("span", [marker.replacedWith], "CodeMirror-widget");
5999        if (!options.handleMouseEvents) { marker.widgetNode.setAttribute("cm-ignore-events", "true"); }
6000        if (options.insertLeft) { marker.widgetNode.insertLeft = true; }
6001      }
6002      if (marker.collapsed) {
6003        if (conflictingCollapsedRange(doc, from.line, from, to, marker) ||
6004            from.line != to.line && conflictingCollapsedRange(doc, to.line, from, to, marker))
6005          { throw new Error("Inserting collapsed marker partially overlapping an existing one") }
6006        seeCollapsedSpans();
6007      }
6008  
6009      if (marker.addToHistory)
6010        { addChangeToHistory(doc, {from: from, to: to, origin: "markText"}, doc.sel, NaN); }
6011  
6012      var curLine = from.line, cm = doc.cm, updateMaxLine;
6013      doc.iter(curLine, to.line + 1, function (line) {
6014        if (cm && marker.collapsed && !cm.options.lineWrapping && visualLine(line) == cm.display.maxLine)
6015          { updateMaxLine = true; }
6016        if (marker.collapsed && curLine != from.line) { updateLineHeight(line, 0); }
6017        addMarkedSpan(line, new MarkedSpan(marker,
6018                                           curLine == from.line ? from.ch : null,
6019                                           curLine == to.line ? to.ch : null), doc.cm && doc.cm.curOp);
6020        ++curLine;
6021      });
6022      // lineIsHidden depends on the presence of the spans, so needs a second pass
6023      if (marker.collapsed) { doc.iter(from.line, to.line + 1, function (line) {
6024        if (lineIsHidden(doc, line)) { updateLineHeight(line, 0); }
6025      }); }
6026  
6027      if (marker.clearOnEnter) { on(marker, "beforeCursorEnter", function () { return marker.clear(); }); }
6028  
6029      if (marker.readOnly) {
6030        seeReadOnlySpans();
6031        if (doc.history.done.length || doc.history.undone.length)
6032          { doc.clearHistory(); }
6033      }
6034      if (marker.collapsed) {
6035        marker.id = ++nextMarkerId;
6036        marker.atomic = true;
6037      }
6038      if (cm) {
6039        // Sync editor state
6040        if (updateMaxLine) { cm.curOp.updateMaxLine = true; }
6041        if (marker.collapsed)
6042          { regChange(cm, from.line, to.line + 1); }
6043        else if (marker.className || marker.startStyle || marker.endStyle || marker.css ||
6044                 marker.attributes || marker.title)
6045          { for (var i = from.line; i <= to.line; i++) { regLineChange(cm, i, "text"); } }
6046        if (marker.atomic) { reCheckSelection(cm.doc); }
6047        signalLater(cm, "markerAdded", cm, marker);
6048      }
6049      return marker
6050    }
6051  
6052    // SHARED TEXTMARKERS
6053  
6054    // A shared marker spans multiple linked documents. It is
6055    // implemented as a meta-marker-object controlling multiple normal
6056    // markers.
6057    var SharedTextMarker = function(markers, primary) {
6058      this.markers = markers;
6059      this.primary = primary;
6060      for (var i = 0; i < markers.length; ++i)
6061        { markers[i].parent = this; }
6062    };
6063  
6064    SharedTextMarker.prototype.clear = function () {
6065      if (this.explicitlyCleared) { return }
6066      this.explicitlyCleared = true;
6067      for (var i = 0; i < this.markers.length; ++i)
6068        { this.markers[i].clear(); }
6069      signalLater(this, "clear");
6070    };
6071  
6072    SharedTextMarker.prototype.find = function (side, lineObj) {
6073      return this.primary.find(side, lineObj)
6074    };
6075    eventMixin(SharedTextMarker);
6076  
6077    function markTextShared(doc, from, to, options, type) {
6078      options = copyObj(options);
6079      options.shared = false;
6080      var markers = [markText(doc, from, to, options, type)], primary = markers[0];
6081      var widget = options.widgetNode;
6082      linkedDocs(doc, function (doc) {
6083        if (widget) { options.widgetNode = widget.cloneNode(true); }
6084        markers.push(markText(doc, clipPos(doc, from), clipPos(doc, to), options, type));
6085        for (var i = 0; i < doc.linked.length; ++i)
6086          { if (doc.linked[i].isParent) { return } }
6087        primary = lst(markers);
6088      });
6089      return new SharedTextMarker(markers, primary)
6090    }
6091  
6092    function findSharedMarkers(doc) {
6093      return doc.findMarks(Pos(doc.first, 0), doc.clipPos(Pos(doc.lastLine())), function (m) { return m.parent; })
6094    }
6095  
6096    function copySharedMarkers(doc, markers) {
6097      for (var i = 0; i < markers.length; i++) {
6098        var marker = markers[i], pos = marker.find();
6099        var mFrom = doc.clipPos(pos.from), mTo = doc.clipPos(pos.to);
6100        if (cmp(mFrom, mTo)) {
6101          var subMark = markText(doc, mFrom, mTo, marker.primary, marker.primary.type);
6102          marker.markers.push(subMark);
6103          subMark.parent = marker;
6104        }
6105      }
6106    }
6107  
6108    function detachSharedMarkers(markers) {
6109      var loop = function ( i ) {
6110        var marker = markers[i], linked = [marker.primary.doc];
6111        linkedDocs(marker.primary.doc, function (d) { return linked.push(d); });
6112        for (var j = 0; j < marker.markers.length; j++) {
6113          var subMarker = marker.markers[j];
6114          if (indexOf(linked, subMarker.doc) == -1) {
6115            subMarker.parent = null;
6116            marker.markers.splice(j--, 1);
6117          }
6118        }
6119      };
6120  
6121      for (var i = 0; i < markers.length; i++) loop( i );
6122    }
6123  
6124    var nextDocId = 0;
6125    var Doc = function(text, mode, firstLine, lineSep, direction) {
6126      if (!(this instanceof Doc)) { return new Doc(text, mode, firstLine, lineSep, direction) }
6127      if (firstLine == null) { firstLine = 0; }
6128  
6129      BranchChunk.call(this, [new LeafChunk([new Line("", null)])]);
6130      this.first = firstLine;
6131      this.scrollTop = this.scrollLeft = 0;
6132      this.cantEdit = false;
6133      this.cleanGeneration = 1;
6134      this.modeFrontier = this.highlightFrontier = firstLine;
6135      var start = Pos(firstLine, 0);
6136      this.sel = simpleSelection(start);
6137      this.history = new History(null);
6138      this.id = ++nextDocId;
6139      this.modeOption = mode;
6140      this.lineSep = lineSep;
6141      this.direction = (direction == "rtl") ? "rtl" : "ltr";
6142      this.extend = false;
6143  
6144      if (typeof text == "string") { text = this.splitLines(text); }
6145      updateDoc(this, {from: start, to: start, text: text});
6146      setSelection(this, simpleSelection(start), sel_dontScroll);
6147    };
6148  
6149    Doc.prototype = createObj(BranchChunk.prototype, {
6150      constructor: Doc,
6151      // Iterate over the document. Supports two forms -- with only one
6152      // argument, it calls that for each line in the document. With
6153      // three, it iterates over the range given by the first two (with
6154      // the second being non-inclusive).
6155      iter: function(from, to, op) {
6156        if (op) { this.iterN(from - this.first, to - from, op); }
6157        else { this.iterN(this.first, this.first + this.size, from); }
6158      },
6159  
6160      // Non-public interface for adding and removing lines.
6161      insert: function(at, lines) {
6162        var height = 0;
6163        for (var i = 0; i < lines.length; ++i) { height += lines[i].height; }
6164        this.insertInner(at - this.first, lines, height);
6165      },
6166      remove: function(at, n) { this.removeInner(at - this.first, n); },
6167  
6168      // From here, the methods are part of the public interface. Most
6169      // are also available from CodeMirror (editor) instances.
6170  
6171      getValue: function(lineSep) {
6172        var lines = getLines(this, this.first, this.first + this.size);
6173        if (lineSep === false) { return lines }
6174        return lines.join(lineSep || this.lineSeparator())
6175      },
6176      setValue: docMethodOp(function(code) {
6177        var top = Pos(this.first, 0), last = this.first + this.size - 1;
6178        makeChange(this, {from: top, to: Pos(last, getLine(this, last).text.length),
6179                          text: this.splitLines(code), origin: "setValue", full: true}, true);
6180        if (this.cm) { scrollToCoords(this.cm, 0, 0); }
6181        setSelection(this, simpleSelection(top), sel_dontScroll);
6182      }),
6183      replaceRange: function(code, from, to, origin) {
6184        from = clipPos(this, from);
6185        to = to ? clipPos(this, to) : from;
6186        replaceRange(this, code, from, to, origin);
6187      },
6188      getRange: function(from, to, lineSep) {
6189        var lines = getBetween(this, clipPos(this, from), clipPos(this, to));
6190        if (lineSep === false) { return lines }
6191        if (lineSep === '') { return lines.join('') }
6192        return lines.join(lineSep || this.lineSeparator())
6193      },
6194  
6195      getLine: function(line) {var l = this.getLineHandle(line); return l && l.text},
6196  
6197      getLineHandle: function(line) {if (isLine(this, line)) { return getLine(this, line) }},
6198      getLineNumber: function(line) {return lineNo(line)},
6199  
6200      getLineHandleVisualStart: function(line) {
6201        if (typeof line == "number") { line = getLine(this, line); }
6202        return visualLine(line)
6203      },
6204  
6205      lineCount: function() {return this.size},
6206      firstLine: function() {return this.first},
6207      lastLine: function() {return this.first + this.size - 1},
6208  
6209      clipPos: function(pos) {return clipPos(this, pos)},
6210  
6211      getCursor: function(start) {
6212        var range = this.sel.primary(), pos;
6213        if (start == null || start == "head") { pos = range.head; }
6214        else if (start == "anchor") { pos = range.anchor; }
6215        else if (start == "end" || start == "to" || start === false) { pos = range.to(); }
6216        else { pos = range.from(); }
6217        return pos
6218      },
6219      listSelections: function() { return this.sel.ranges },
6220      somethingSelected: function() {return this.sel.somethingSelected()},
6221  
6222      setCursor: docMethodOp(function(line, ch, options) {
6223        setSimpleSelection(this, clipPos(this, typeof line == "number" ? Pos(line, ch || 0) : line), null, options);
6224      }),
6225      setSelection: docMethodOp(function(anchor, head, options) {
6226        setSimpleSelection(this, clipPos(this, anchor), clipPos(this, head || anchor), options);
6227      }),
6228      extendSelection: docMethodOp(function(head, other, options) {
6229        extendSelection(this, clipPos(this, head), other && clipPos(this, other), options);
6230      }),
6231      extendSelections: docMethodOp(function(heads, options) {
6232        extendSelections(this, clipPosArray(this, heads), options);
6233      }),
6234      extendSelectionsBy: docMethodOp(function(f, options) {
6235        var heads = map(this.sel.ranges, f);
6236        extendSelections(this, clipPosArray(this, heads), options);
6237      }),
6238      setSelections: docMethodOp(function(ranges, primary, options) {
6239        if (!ranges.length) { return }
6240        var out = [];
6241        for (var i = 0; i < ranges.length; i++)
6242          { out[i] = new Range(clipPos(this, ranges[i].anchor),
6243                             clipPos(this, ranges[i].head || ranges[i].anchor)); }
6244        if (primary == null) { primary = Math.min(ranges.length - 1, this.sel.primIndex); }
6245        setSelection(this, normalizeSelection(this.cm, out, primary), options);
6246      }),
6247      addSelection: docMethodOp(function(anchor, head, options) {
6248        var ranges = this.sel.ranges.slice(0);
6249        ranges.push(new Range(clipPos(this, anchor), clipPos(this, head || anchor)));
6250        setSelection(this, normalizeSelection(this.cm, ranges, ranges.length - 1), options);
6251      }),
6252  
6253      getSelection: function(lineSep) {
6254        var ranges = this.sel.ranges, lines;
6255        for (var i = 0; i < ranges.length; i++) {
6256          var sel = getBetween(this, ranges[i].from(), ranges[i].to());
6257          lines = lines ? lines.concat(sel) : sel;
6258        }
6259        if (lineSep === false) { return lines }
6260        else { return lines.join(lineSep || this.lineSeparator()) }
6261      },
6262      getSelections: function(lineSep) {
6263        var parts = [], ranges = this.sel.ranges;
6264        for (var i = 0; i < ranges.length; i++) {
6265          var sel = getBetween(this, ranges[i].from(), ranges[i].to());
6266          if (lineSep !== false) { sel = sel.join(lineSep || this.lineSeparator()); }
6267          parts[i] = sel;
6268        }
6269        return parts
6270      },
6271      replaceSelection: function(code, collapse, origin) {
6272        var dup = [];
6273        for (var i = 0; i < this.sel.ranges.length; i++)
6274          { dup[i] = code; }
6275        this.replaceSelections(dup, collapse, origin || "+input");
6276      },
6277      replaceSelections: docMethodOp(function(code, collapse, origin) {
6278        var changes = [], sel = this.sel;
6279        for (var i = 0; i < sel.ranges.length; i++) {
6280          var range = sel.ranges[i];
6281          changes[i] = {from: range.from(), to: range.to(), text: this.splitLines(code[i]), origin: origin};
6282        }
6283        var newSel = collapse && collapse != "end" && computeReplacedSel(this, changes, collapse);
6284        for (var i$1 = changes.length - 1; i$1 >= 0; i$1--)
6285          { makeChange(this, changes[i$1]); }
6286        if (newSel) { setSelectionReplaceHistory(this, newSel); }
6287        else if (this.cm) { ensureCursorVisible(this.cm); }
6288      }),
6289      undo: docMethodOp(function() {makeChangeFromHistory(this, "undo");}),
6290      redo: docMethodOp(function() {makeChangeFromHistory(this, "redo");}),
6291      undoSelection: docMethodOp(function() {makeChangeFromHistory(this, "undo", true);}),
6292      redoSelection: docMethodOp(function() {makeChangeFromHistory(this, "redo", true);}),
6293  
6294      setExtending: function(val) {this.extend = val;},
6295      getExtending: function() {return this.extend},
6296  
6297      historySize: function() {
6298        var hist = this.history, done = 0, undone = 0;
6299        for (var i = 0; i < hist.done.length; i++) { if (!hist.done[i].ranges) { ++done; } }
6300        for (var i$1 = 0; i$1 < hist.undone.length; i$1++) { if (!hist.undone[i$1].ranges) { ++undone; } }
6301        return {undo: done, redo: undone}
6302      },
6303      clearHistory: function() {
6304        var this$1 = this;
6305  
6306        this.history = new History(this.history);
6307        linkedDocs(this, function (doc) { return doc.history = this$1.history; }, true);
6308      },
6309  
6310      markClean: function() {
6311        this.cleanGeneration = this.changeGeneration(true);
6312      },
6313      changeGeneration: function(forceSplit) {
6314        if (forceSplit)
6315          { this.history.lastOp = this.history.lastSelOp = this.history.lastOrigin = null; }
6316        return this.history.generation
6317      },
6318      isClean: function (gen) {
6319        return this.history.generation == (gen || this.cleanGeneration)
6320      },
6321  
6322      getHistory: function() {
6323        return {done: copyHistoryArray(this.history.done),
6324                undone: copyHistoryArray(this.history.undone)}
6325      },
6326      setHistory: function(histData) {
6327        var hist = this.history = new History(this.history);
6328        hist.done = copyHistoryArray(histData.done.slice(0), null, true);
6329        hist.undone = copyHistoryArray(histData.undone.slice(0), null, true);
6330      },
6331  
6332      setGutterMarker: docMethodOp(function(line, gutterID, value) {
6333        return changeLine(this, line, "gutter", function (line) {
6334          var markers = line.gutterMarkers || (line.gutterMarkers = {});
6335          markers[gutterID] = value;
6336          if (!value && isEmpty(markers)) { line.gutterMarkers = null; }
6337          return true
6338        })
6339      }),
6340  
6341      clearGutter: docMethodOp(function(gutterID) {
6342        var this$1 = this;
6343  
6344        this.iter(function (line) {
6345          if (line.gutterMarkers && line.gutterMarkers[gutterID]) {
6346            changeLine(this$1, line, "gutter", function () {
6347              line.gutterMarkers[gutterID] = null;
6348              if (isEmpty(line.gutterMarkers)) { line.gutterMarkers = null; }
6349              return true
6350            });
6351          }
6352        });
6353      }),
6354  
6355      lineInfo: function(line) {
6356        var n;
6357        if (typeof line == "number") {
6358          if (!isLine(this, line)) { return null }
6359          n = line;
6360          line = getLine(this, line);
6361          if (!line) { return null }
6362        } else {
6363          n = lineNo(line);
6364          if (n == null) { return null }
6365        }
6366        return {line: n, handle: line, text: line.text, gutterMarkers: line.gutterMarkers,
6367                textClass: line.textClass, bgClass: line.bgClass, wrapClass: line.wrapClass,
6368                widgets: line.widgets}
6369      },
6370  
6371      addLineClass: docMethodOp(function(handle, where, cls) {
6372        return changeLine(this, handle, where == "gutter" ? "gutter" : "class", function (line) {
6373          var prop = where == "text" ? "textClass"
6374                   : where == "background" ? "bgClass"
6375                   : where == "gutter" ? "gutterClass" : "wrapClass";
6376          if (!line[prop]) { line[prop] = cls; }
6377          else if (classTest(cls).test(line[prop])) { return false }
6378          else { line[prop] += " " + cls; }
6379          return true
6380        })
6381      }),
6382      removeLineClass: docMethodOp(function(handle, where, cls) {
6383        return changeLine(this, handle, where == "gutter" ? "gutter" : "class", function (line) {
6384          var prop = where == "text" ? "textClass"
6385                   : where == "background" ? "bgClass"
6386                   : where == "gutter" ? "gutterClass" : "wrapClass";
6387          var cur = line[prop];
6388          if (!cur) { return false }
6389          else if (cls == null) { line[prop] = null; }
6390          else {
6391            var found = cur.match(classTest(cls));
6392            if (!found) { return false }
6393            var end = found.index + found[0].length;
6394            line[prop] = cur.slice(0, found.index) + (!found.index || end == cur.length ? "" : " ") + cur.slice(end) || null;
6395          }
6396          return true
6397        })
6398      }),
6399  
6400      addLineWidget: docMethodOp(function(handle, node, options) {
6401        return addLineWidget(this, handle, node, options)
6402      }),
6403      removeLineWidget: function(widget) { widget.clear(); },
6404  
6405      markText: function(from, to, options) {
6406        return markText(this, clipPos(this, from), clipPos(this, to), options, options && options.type || "range")
6407      },
6408      setBookmark: function(pos, options) {
6409        var realOpts = {replacedWith: options && (options.nodeType == null ? options.widget : options),
6410                        insertLeft: options && options.insertLeft,
6411                        clearWhenEmpty: false, shared: options && options.shared,
6412                        handleMouseEvents: options && options.handleMouseEvents};
6413        pos = clipPos(this, pos);
6414        return markText(this, pos, pos, realOpts, "bookmark")
6415      },
6416      findMarksAt: function(pos) {
6417        pos = clipPos(this, pos);
6418        var markers = [], spans = getLine(this, pos.line).markedSpans;
6419        if (spans) { for (var i = 0; i < spans.length; ++i) {
6420          var span = spans[i];
6421          if ((span.from == null || span.from <= pos.ch) &&
6422              (span.to == null || span.to >= pos.ch))
6423            { markers.push(span.marker.parent || span.marker); }
6424        } }
6425        return markers
6426      },
6427      findMarks: function(from, to, filter) {
6428        from = clipPos(this, from); to = clipPos(this, to);
6429        var found = [], lineNo = from.line;
6430        this.iter(from.line, to.line + 1, function (line) {
6431          var spans = line.markedSpans;
6432          if (spans) { for (var i = 0; i < spans.length; i++) {
6433            var span = spans[i];
6434            if (!(span.to != null && lineNo == from.line && from.ch >= span.to ||
6435                  span.from == null && lineNo != from.line ||
6436                  span.from != null && lineNo == to.line && span.from >= to.ch) &&
6437                (!filter || filter(span.marker)))
6438              { found.push(span.marker.parent || span.marker); }
6439          } }
6440          ++lineNo;
6441        });
6442        return found
6443      },
6444      getAllMarks: function() {
6445        var markers = [];
6446        this.iter(function (line) {
6447          var sps = line.markedSpans;
6448          if (sps) { for (var i = 0; i < sps.length; ++i)
6449            { if (sps[i].from != null) { markers.push(sps[i].marker); } } }
6450        });
6451        return markers
6452      },
6453  
6454      posFromIndex: function(off) {
6455        var ch, lineNo = this.first, sepSize = this.lineSeparator().length;
6456        this.iter(function (line) {
6457          var sz = line.text.length + sepSize;
6458          if (sz > off) { ch = off; return true }
6459          off -= sz;
6460          ++lineNo;
6461        });
6462        return clipPos(this, Pos(lineNo, ch))
6463      },
6464      indexFromPos: function (coords) {
6465        coords = clipPos(this, coords);
6466        var index = coords.ch;
6467        if (coords.line < this.first || coords.ch < 0) { return 0 }
6468        var sepSize = this.lineSeparator().length;
6469        this.iter(this.first, coords.line, function (line) { // iter aborts when callback returns a truthy value
6470          index += line.text.length + sepSize;
6471        });
6472        return index
6473      },
6474  
6475      copy: function(copyHistory) {
6476        var doc = new Doc(getLines(this, this.first, this.first + this.size),
6477                          this.modeOption, this.first, this.lineSep, this.direction);
6478        doc.scrollTop = this.scrollTop; doc.scrollLeft = this.scrollLeft;
6479        doc.sel = this.sel;
6480        doc.extend = false;
6481        if (copyHistory) {
6482          doc.history.undoDepth = this.history.undoDepth;
6483          doc.setHistory(this.getHistory());
6484        }
6485        return doc
6486      },
6487  
6488      linkedDoc: function(options) {
6489        if (!options) { options = {}; }
6490        var from = this.first, to = this.first + this.size;
6491        if (options.from != null && options.from > from) { from = options.from; }
6492        if (options.to != null && options.to < to) { to = options.to; }
6493        var copy = new Doc(getLines(this, from, to), options.mode || this.modeOption, from, this.lineSep, this.direction);
6494        if (options.sharedHist) { copy.history = this.history
6495        ; }(this.linked || (this.linked = [])).push({doc: copy, sharedHist: options.sharedHist});
6496        copy.linked = [{doc: this, isParent: true, sharedHist: options.sharedHist}];
6497        copySharedMarkers(copy, findSharedMarkers(this));
6498        return copy
6499      },
6500      unlinkDoc: function(other) {
6501        if (other instanceof CodeMirror) { other = other.doc; }
6502        if (this.linked) { for (var i = 0; i < this.linked.length; ++i) {
6503          var link = this.linked[i];
6504          if (link.doc != other) { continue }
6505          this.linked.splice(i, 1);
6506          other.unlinkDoc(this);
6507          detachSharedMarkers(findSharedMarkers(this));
6508          break
6509        } }
6510        // If the histories were shared, split them again
6511        if (other.history == this.history) {
6512          var splitIds = [other.id];
6513          linkedDocs(other, function (doc) { return splitIds.push(doc.id); }, true);
6514          other.history = new History(null);
6515          other.history.done = copyHistoryArray(this.history.done, splitIds);
6516          other.history.undone = copyHistoryArray(this.history.undone, splitIds);
6517        }
6518      },
6519      iterLinkedDocs: function(f) {linkedDocs(this, f);},
6520  
6521      getMode: function() {return this.mode},
6522      getEditor: function() {return this.cm},
6523  
6524      splitLines: function(str) {
6525        if (this.lineSep) { return str.split(this.lineSep) }
6526        return splitLinesAuto(str)
6527      },
6528      lineSeparator: function() { return this.lineSep || "\n" },
6529  
6530      setDirection: docMethodOp(function (dir) {
6531        if (dir != "rtl") { dir = "ltr"; }
6532        if (dir == this.direction) { return }
6533        this.direction = dir;
6534        this.iter(function (line) { return line.order = null; });
6535        if (this.cm) { directionChanged(this.cm); }
6536      })
6537    });
6538  
6539    // Public alias.
6540    Doc.prototype.eachLine = Doc.prototype.iter;
6541  
6542    // Kludge to work around strange IE behavior where it'll sometimes
6543    // re-fire a series of drag-related events right after the drop (#1551)
6544    var lastDrop = 0;
6545  
6546    function onDrop(e) {
6547      var cm = this;
6548      clearDragCursor(cm);
6549      if (signalDOMEvent(cm, e) || eventInWidget(cm.display, e))
6550        { return }
6551      e_preventDefault(e);
6552      if (ie) { lastDrop = +new Date; }
6553      var pos = posFromMouse(cm, e, true), files = e.dataTransfer.files;
6554      if (!pos || cm.isReadOnly()) { return }
6555      // Might be a file drop, in which case we simply extract the text
6556      // and insert it.
6557      if (files && files.length && window.FileReader && window.File) {
6558        var n = files.length, text = Array(n), read = 0;
6559        var markAsReadAndPasteIfAllFilesAreRead = function () {
6560          if (++read == n) {
6561            operation(cm, function () {
6562              pos = clipPos(cm.doc, pos);
6563              var change = {from: pos, to: pos,
6564                            text: cm.doc.splitLines(
6565                                text.filter(function (t) { return t != null; }).join(cm.doc.lineSeparator())),
6566                            origin: "paste"};
6567              makeChange(cm.doc, change);
6568              setSelectionReplaceHistory(cm.doc, simpleSelection(clipPos(cm.doc, pos), clipPos(cm.doc, changeEnd(change))));
6569            })();
6570          }
6571        };
6572        var readTextFromFile = function (file, i) {
6573          if (cm.options.allowDropFileTypes &&
6574              indexOf(cm.options.allowDropFileTypes, file.type) == -1) {
6575            markAsReadAndPasteIfAllFilesAreRead();
6576            return
6577          }
6578          var reader = new FileReader;
6579          reader.onerror = function () { return markAsReadAndPasteIfAllFilesAreRead(); };
6580          reader.onload = function () {
6581            var content = reader.result;
6582            if (/[\x00-\x08\x0e-\x1f]{2}/.test(content)) {
6583              markAsReadAndPasteIfAllFilesAreRead();
6584              return
6585            }
6586            text[i] = content;
6587            markAsReadAndPasteIfAllFilesAreRead();
6588          };
6589          reader.readAsText(file);
6590        };
6591        for (var i = 0; i < files.length; i++) { readTextFromFile(files[i], i); }
6592      } else { // Normal drop
6593        // Don't do a replace if the drop happened inside of the selected text.
6594        if (cm.state.draggingText && cm.doc.sel.contains(pos) > -1) {
6595          cm.state.draggingText(e);
6596          // Ensure the editor is re-focused
6597          setTimeout(function () { return cm.display.input.focus(); }, 20);
6598          return
6599        }
6600        try {
6601          var text$1 = e.dataTransfer.getData("Text");
6602          if (text$1) {
6603            var selected;
6604            if (cm.state.draggingText && !cm.state.draggingText.copy)
6605              { selected = cm.listSelections(); }
6606            setSelectionNoUndo(cm.doc, simpleSelection(pos, pos));
6607            if (selected) { for (var i$1 = 0; i$1 < selected.length; ++i$1)
6608              { replaceRange(cm.doc, "", selected[i$1].anchor, selected[i$1].head, "drag"); } }
6609            cm.replaceSelection(text$1, "around", "paste");
6610            cm.display.input.focus();
6611          }
6612        }
6613        catch(e$1){}
6614      }
6615    }
6616  
6617    function onDragStart(cm, e) {
6618      if (ie && (!cm.state.draggingText || +new Date - lastDrop < 100)) { e_stop(e); return }
6619      if (signalDOMEvent(cm, e) || eventInWidget(cm.display, e)) { return }
6620  
6621      e.dataTransfer.setData("Text", cm.getSelection());
6622      e.dataTransfer.effectAllowed = "copyMove";
6623  
6624      // Use dummy image instead of default browsers image.
6625      // Recent Safari (~6.0.2) have a tendency to segfault when this happens, so we don't do it there.
6626      if (e.dataTransfer.setDragImage && !safari) {
6627        var img = elt("img", null, null, "position: fixed; left: 0; top: 0;");
6628        img.src = "data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==";
6629        if (presto) {
6630          img.width = img.height = 1;
6631          cm.display.wrapper.appendChild(img);
6632          // Force a relayout, or Opera won't use our image for some obscure reason
6633          img._top = img.offsetTop;
6634        }
6635        e.dataTransfer.setDragImage(img, 0, 0);
6636        if (presto) { img.parentNode.removeChild(img); }
6637      }
6638    }
6639  
6640    function onDragOver(cm, e) {
6641      var pos = posFromMouse(cm, e);
6642      if (!pos) { return }
6643      var frag = document.createDocumentFragment();
6644      drawSelectionCursor(cm, pos, frag);
6645      if (!cm.display.dragCursor) {
6646        cm.display.dragCursor = elt("div", null, "CodeMirror-cursors CodeMirror-dragcursors");
6647        cm.display.lineSpace.insertBefore(cm.display.dragCursor, cm.display.cursorDiv);
6648      }
6649      removeChildrenAndAdd(cm.display.dragCursor, frag);
6650    }
6651  
6652    function clearDragCursor(cm) {
6653      if (cm.display.dragCursor) {
6654        cm.display.lineSpace.removeChild(cm.display.dragCursor);
6655        cm.display.dragCursor = null;
6656      }
6657    }
6658  
6659    // These must be handled carefully, because naively registering a
6660    // handler for each editor will cause the editors to never be
6661    // garbage collected.
6662  
6663    function forEachCodeMirror(f) {
6664      if (!document.getElementsByClassName) { return }
6665      var byClass = document.getElementsByClassName("CodeMirror"), editors = [];
6666      for (var i = 0; i < byClass.length; i++) {
6667        var cm = byClass[i].CodeMirror;
6668        if (cm) { editors.push(cm); }
6669      }
6670      if (editors.length) { editors[0].operation(function () {
6671        for (var i = 0; i < editors.length; i++) { f(editors[i]); }
6672      }); }
6673    }
6674  
6675    var globalsRegistered = false;
6676    function ensureGlobalHandlers() {
6677      if (globalsRegistered) { return }
6678      registerGlobalHandlers();
6679      globalsRegistered = true;
6680    }
6681    function registerGlobalHandlers() {
6682      // When the window resizes, we need to refresh active editors.
6683      var resizeTimer;
6684      on(window, "resize", function () {
6685        if (resizeTimer == null) { resizeTimer = setTimeout(function () {
6686          resizeTimer = null;
6687          forEachCodeMirror(onResize);
6688        }, 100); }
6689      });
6690      // When the window loses focus, we want to show the editor as blurred
6691      on(window, "blur", function () { return forEachCodeMirror(onBlur); });
6692    }
6693    // Called when the window resizes
6694    function onResize(cm) {
6695      var d = cm.display;
6696      // Might be a text scaling operation, clear size caches.
6697      d.cachedCharWidth = d.cachedTextHeight = d.cachedPaddingH = null;
6698      d.scrollbarsClipped = false;
6699      cm.setSize();
6700    }
6701  
6702    var keyNames = {
6703      3: "Pause", 8: "Backspace", 9: "Tab", 13: "Enter", 16: "Shift", 17: "Ctrl", 18: "Alt",
6704      19: "Pause", 20: "CapsLock", 27: "Esc", 32: "Space", 33: "PageUp", 34: "PageDown", 35: "End",
6705      36: "Home", 37: "Left", 38: "Up", 39: "Right", 40: "Down", 44: "PrintScrn", 45: "Insert",
6706      46: "Delete", 59: ";", 61: "=", 91: "Mod", 92: "Mod", 93: "Mod",
6707      106: "*", 107: "=", 109: "-", 110: ".", 111: "/", 145: "ScrollLock",
6708      173: "-", 186: ";", 187: "=", 188: ",", 189: "-", 190: ".", 191: "/", 192: "`", 219: "[", 220: "\\",
6709      221: "]", 222: "'", 224: "Mod", 63232: "Up", 63233: "Down", 63234: "Left", 63235: "Right", 63272: "Delete",
6710      63273: "Home", 63275: "End", 63276: "PageUp", 63277: "PageDown", 63302: "Insert"
6711    };
6712  
6713    // Number keys
6714    for (var i = 0; i < 10; i++) { keyNames[i + 48] = keyNames[i + 96] = String(i); }
6715    // Alphabetic keys
6716    for (var i$1 = 65; i$1 <= 90; i$1++) { keyNames[i$1] = String.fromCharCode(i$1); }
6717    // Function keys
6718    for (var i$2 = 1; i$2 <= 12; i$2++) { keyNames[i$2 + 111] = keyNames[i$2 + 63235] = "F" + i$2; }
6719  
6720    var keyMap = {};
6721  
6722    keyMap.basic = {
6723      "Left": "goCharLeft", "Right": "goCharRight", "Up": "goLineUp", "Down": "goLineDown",
6724      "End": "goLineEnd", "Home": "goLineStartSmart", "PageUp": "goPageUp", "PageDown": "goPageDown",
6725      "Delete": "delCharAfter", "Backspace": "delCharBefore", "Shift-Backspace": "delCharBefore",
6726      "Tab": "defaultTab", "Shift-Tab": "indentAuto",
6727      "Enter": "newlineAndIndent", "Insert": "toggleOverwrite",
6728      "Esc": "singleSelection"
6729    };
6730    // Note that the save and find-related commands aren't defined by
6731    // default. User code or addons can define them. Unknown commands
6732    // are simply ignored.
6733    keyMap.pcDefault = {
6734      "Ctrl-A": "selectAll", "Ctrl-D": "deleteLine", "Ctrl-Z": "undo", "Shift-Ctrl-Z": "redo", "Ctrl-Y": "redo",
6735      "Ctrl-Home": "goDocStart", "Ctrl-End": "goDocEnd", "Ctrl-Up": "goLineUp", "Ctrl-Down": "goLineDown",
6736      "Ctrl-Left": "goGroupLeft", "Ctrl-Right": "goGroupRight", "Alt-Left": "goLineStart", "Alt-Right": "goLineEnd",
6737      "Ctrl-Backspace": "delGroupBefore", "Ctrl-Delete": "delGroupAfter", "Ctrl-S": "save", "Ctrl-F": "find",
6738      "Ctrl-G": "findNext", "Shift-Ctrl-G": "findPrev", "Shift-Ctrl-F": "replace", "Shift-Ctrl-R": "replaceAll",
6739      "Ctrl-[": "indentLess", "Ctrl-]": "indentMore",
6740      "Ctrl-U": "undoSelection", "Shift-Ctrl-U": "redoSelection", "Alt-U": "redoSelection",
6741      "fallthrough": "basic"
6742    };
6743    // Very basic readline/emacs-style bindings, which are standard on Mac.
6744    keyMap.emacsy = {
6745      "Ctrl-F": "goCharRight", "Ctrl-B": "goCharLeft", "Ctrl-P": "goLineUp", "Ctrl-N": "goLineDown",
6746      "Ctrl-A": "goLineStart", "Ctrl-E": "goLineEnd", "Ctrl-V": "goPageDown", "Shift-Ctrl-V": "goPageUp",
6747      "Ctrl-D": "delCharAfter", "Ctrl-H": "delCharBefore", "Alt-Backspace": "delWordBefore", "Ctrl-K": "killLine",
6748      "Ctrl-T": "transposeChars", "Ctrl-O": "openLine"
6749    };
6750    keyMap.macDefault = {
6751      "Cmd-A": "selectAll", "Cmd-D": "deleteLine", "Cmd-Z": "undo", "Shift-Cmd-Z": "redo", "Cmd-Y": "redo",
6752      "Cmd-Home": "goDocStart", "Cmd-Up": "goDocStart", "Cmd-End": "goDocEnd", "Cmd-Down": "goDocEnd", "Alt-Left": "goGroupLeft",
6753      "Alt-Right": "goGroupRight", "Cmd-Left": "goLineLeft", "Cmd-Right": "goLineRight", "Alt-Backspace": "delGroupBefore",
6754      "Ctrl-Alt-Backspace": "delGroupAfter", "Alt-Delete": "delGroupAfter", "Cmd-S": "save", "Cmd-F": "find",
6755      "Cmd-G": "findNext", "Shift-Cmd-G": "findPrev", "Cmd-Alt-F": "replace", "Shift-Cmd-Alt-F": "replaceAll",
6756      "Cmd-[": "indentLess", "Cmd-]": "indentMore", "Cmd-Backspace": "delWrappedLineLeft", "Cmd-Delete": "delWrappedLineRight",
6757      "Cmd-U": "undoSelection", "Shift-Cmd-U": "redoSelection", "Ctrl-Up": "goDocStart", "Ctrl-Down": "goDocEnd",
6758      "fallthrough": ["basic", "emacsy"]
6759    };
6760    keyMap["default"] = mac ? keyMap.macDefault : keyMap.pcDefault;
6761  
6762    // KEYMAP DISPATCH
6763  
6764    function normalizeKeyName(name) {
6765      var parts = name.split(/-(?!$)/);
6766      name = parts[parts.length - 1];
6767      var alt, ctrl, shift, cmd;
6768      for (var i = 0; i < parts.length - 1; i++) {
6769        var mod = parts[i];
6770        if (/^(cmd|meta|m)$/i.test(mod)) { cmd = true; }
6771        else if (/^a(lt)?$/i.test(mod)) { alt = true; }
6772        else if (/^(c|ctrl|control)$/i.test(mod)) { ctrl = true; }
6773        else if (/^s(hift)?$/i.test(mod)) { shift = true; }
6774        else { throw new Error("Unrecognized modifier name: " + mod) }
6775      }
6776      if (alt) { name = "Alt-" + name; }
6777      if (ctrl) { name = "Ctrl-" + name; }
6778      if (cmd) { name = "Cmd-" + name; }
6779      if (shift) { name = "Shift-" + name; }
6780      return name
6781    }
6782  
6783    // This is a kludge to keep keymaps mostly working as raw objects
6784    // (backwards compatibility) while at the same time support features
6785    // like normalization and multi-stroke key bindings. It compiles a
6786    // new normalized keymap, and then updates the old object to reflect
6787    // this.
6788    function normalizeKeyMap(keymap) {
6789      var copy = {};
6790      for (var keyname in keymap) { if (keymap.hasOwnProperty(keyname)) {
6791        var value = keymap[keyname];
6792        if (/^(name|fallthrough|(de|at)tach)$/.test(keyname)) { continue }
6793        if (value == "...") { delete keymap[keyname]; continue }
6794  
6795        var keys = map(keyname.split(" "), normalizeKeyName);
6796        for (var i = 0; i < keys.length; i++) {
6797          var val = (void 0), name = (void 0);
6798          if (i == keys.length - 1) {
6799            name = keys.join(" ");
6800            val = value;
6801          } else {
6802            name = keys.slice(0, i + 1).join(" ");
6803            val = "...";
6804          }
6805          var prev = copy[name];
6806          if (!prev) { copy[name] = val; }
6807          else if (prev != val) { throw new Error("Inconsistent bindings for " + name) }
6808        }
6809        delete keymap[keyname];
6810      } }
6811      for (var prop in copy) { keymap[prop] = copy[prop]; }
6812      return keymap
6813    }
6814  
6815    function lookupKey(key, map, handle, context) {
6816      map = getKeyMap(map);
6817      var found = map.call ? map.call(key, context) : map[key];
6818      if (found === false) { return "nothing" }
6819      if (found === "...") { return "multi" }
6820      if (found != null && handle(found)) { return "handled" }
6821  
6822      if (map.fallthrough) {
6823        if (Object.prototype.toString.call(map.fallthrough) != "[object Array]")
6824          { return lookupKey(key, map.fallthrough, handle, context) }
6825        for (var i = 0; i < map.fallthrough.length; i++) {
6826          var result = lookupKey(key, map.fallthrough[i], handle, context);
6827          if (result) { return result }
6828        }
6829      }
6830    }
6831  
6832    // Modifier key presses don't count as 'real' key presses for the
6833    // purpose of keymap fallthrough.
6834    function isModifierKey(value) {
6835      var name = typeof value == "string" ? value : keyNames[value.keyCode];
6836      return name == "Ctrl" || name == "Alt" || name == "Shift" || name == "Mod"
6837    }
6838  
6839    function addModifierNames(name, event, noShift) {
6840      var base = name;
6841      if (event.altKey && base != "Alt") { name = "Alt-" + name; }
6842      if ((flipCtrlCmd ? event.metaKey : event.ctrlKey) && base != "Ctrl") { name = "Ctrl-" + name; }
6843      if ((flipCtrlCmd ? event.ctrlKey : event.metaKey) && base != "Mod") { name = "Cmd-" + name; }
6844      if (!noShift && event.shiftKey && base != "Shift") { name = "Shift-" + name; }
6845      return name
6846    }
6847  
6848    // Look up the name of a key as indicated by an event object.
6849    function keyName(event, noShift) {
6850      if (presto && event.keyCode == 34 && event["char"]) { return false }
6851      var name = keyNames[event.keyCode];
6852      if (name == null || event.altGraphKey) { return false }
6853      // Ctrl-ScrollLock has keyCode 3, same as Ctrl-Pause,
6854      // so we'll use event.code when available (Chrome 48+, FF 38+, Safari 10.1+)
6855      if (event.keyCode == 3 && event.code) { name = event.code; }
6856      return addModifierNames(name, event, noShift)
6857    }
6858  
6859    function getKeyMap(val) {
6860      return typeof val == "string" ? keyMap[val] : val
6861    }
6862  
6863    // Helper for deleting text near the selection(s), used to implement
6864    // backspace, delete, and similar functionality.
6865    function deleteNearSelection(cm, compute) {
6866      var ranges = cm.doc.sel.ranges, kill = [];
6867      // Build up a set of ranges to kill first, merging overlapping
6868      // ranges.
6869      for (var i = 0; i < ranges.length; i++) {
6870        var toKill = compute(ranges[i]);
6871        while (kill.length && cmp(toKill.from, lst(kill).to) <= 0) {
6872          var replaced = kill.pop();
6873          if (cmp(replaced.from, toKill.from) < 0) {
6874            toKill.from = replaced.from;
6875            break
6876          }
6877        }
6878        kill.push(toKill);
6879      }
6880      // Next, remove those actual ranges.
6881      runInOp(cm, function () {
6882        for (var i = kill.length - 1; i >= 0; i--)
6883          { replaceRange(cm.doc, "", kill[i].from, kill[i].to, "+delete"); }
6884        ensureCursorVisible(cm);
6885      });
6886    }
6887  
6888    function moveCharLogically(line, ch, dir) {
6889      var target = skipExtendingChars(line.text, ch + dir, dir);
6890      return target < 0 || target > line.text.length ? null : target
6891    }
6892  
6893    function moveLogically(line, start, dir) {
6894      var ch = moveCharLogically(line, start.ch, dir);
6895      return ch == null ? null : new Pos(start.line, ch, dir < 0 ? "after" : "before")
6896    }
6897  
6898    function endOfLine(visually, cm, lineObj, lineNo, dir) {
6899      if (visually) {
6900        if (cm.doc.direction == "rtl") { dir = -dir; }
6901        var order = getOrder(lineObj, cm.doc.direction);
6902        if (order) {
6903          var part = dir < 0 ? lst(order) : order[0];
6904          var moveInStorageOrder = (dir < 0) == (part.level == 1);
6905          var sticky = moveInStorageOrder ? "after" : "before";
6906          var ch;
6907          // With a wrapped rtl chunk (possibly spanning multiple bidi parts),
6908          // it could be that the last bidi part is not on the last visual line,
6909          // since visual lines contain content order-consecutive chunks.
6910          // Thus, in rtl, we are looking for the first (content-order) character
6911          // in the rtl chunk that is on the last line (that is, the same line
6912          // as the last (content-order) character).
6913          if (part.level > 0 || cm.doc.direction == "rtl") {
6914            var prep = prepareMeasureForLine(cm, lineObj);
6915            ch = dir < 0 ? lineObj.text.length - 1 : 0;
6916            var targetTop = measureCharPrepared(cm, prep, ch).top;
6917            ch = findFirst(function (ch) { return measureCharPrepared(cm, prep, ch).top == targetTop; }, (dir < 0) == (part.level == 1) ? part.from : part.to - 1, ch);
6918            if (sticky == "before") { ch = moveCharLogically(lineObj, ch, 1); }
6919          } else { ch = dir < 0 ? part.to : part.from; }
6920          return new Pos(lineNo, ch, sticky)
6921        }
6922      }
6923      return new Pos(lineNo, dir < 0 ? lineObj.text.length : 0, dir < 0 ? "before" : "after")
6924    }
6925  
6926    function moveVisually(cm, line, start, dir) {
6927      var bidi = getOrder(line, cm.doc.direction);
6928      if (!bidi) { return moveLogically(line, start, dir) }
6929      if (start.ch >= line.text.length) {
6930        start.ch = line.text.length;
6931        start.sticky = "before";
6932      } else if (start.ch <= 0) {
6933        start.ch = 0;
6934        start.sticky = "after";
6935      }
6936      var partPos = getBidiPartAt(bidi, start.ch, start.sticky), part = bidi[partPos];
6937      if (cm.doc.direction == "ltr" && part.level % 2 == 0 && (dir > 0 ? part.to > start.ch : part.from < start.ch)) {
6938        // Case 1: We move within an ltr part in an ltr editor. Even with wrapped lines,
6939        // nothing interesting happens.
6940        return moveLogically(line, start, dir)
6941      }
6942  
6943      var mv = function (pos, dir) { return moveCharLogically(line, pos instanceof Pos ? pos.ch : pos, dir); };
6944      var prep;
6945      var getWrappedLineExtent = function (ch) {
6946        if (!cm.options.lineWrapping) { return {begin: 0, end: line.text.length} }
6947        prep = prep || prepareMeasureForLine(cm, line);
6948        return wrappedLineExtentChar(cm, line, prep, ch)
6949      };
6950      var wrappedLineExtent = getWrappedLineExtent(start.sticky == "before" ? mv(start, -1) : start.ch);
6951  
6952      if (cm.doc.direction == "rtl" || part.level == 1) {
6953        var moveInStorageOrder = (part.level == 1) == (dir < 0);
6954        var ch = mv(start, moveInStorageOrder ? 1 : -1);
6955        if (ch != null && (!moveInStorageOrder ? ch >= part.from && ch >= wrappedLineExtent.begin : ch <= part.to && ch <= wrappedLineExtent.end)) {
6956          // Case 2: We move within an rtl part or in an rtl editor on the same visual line
6957          var sticky = moveInStorageOrder ? "before" : "after";
6958          return new Pos(start.line, ch, sticky)
6959        }
6960      }
6961  
6962      // Case 3: Could not move within this bidi part in this visual line, so leave
6963      // the current bidi part
6964  
6965      var searchInVisualLine = function (partPos, dir, wrappedLineExtent) {
6966        var getRes = function (ch, moveInStorageOrder) { return moveInStorageOrder
6967          ? new Pos(start.line, mv(ch, 1), "before")
6968          : new Pos(start.line, ch, "after"); };
6969  
6970        for (; partPos >= 0 && partPos < bidi.length; partPos += dir) {
6971          var part = bidi[partPos];
6972          var moveInStorageOrder = (dir > 0) == (part.level != 1);
6973          var ch = moveInStorageOrder ? wrappedLineExtent.begin : mv(wrappedLineExtent.end, -1);
6974          if (part.from <= ch && ch < part.to) { return getRes(ch, moveInStorageOrder) }
6975          ch = moveInStorageOrder ? part.from : mv(part.to, -1);
6976          if (wrappedLineExtent.begin <= ch && ch < wrappedLineExtent.end) { return getRes(ch, moveInStorageOrder) }
6977        }
6978      };
6979  
6980      // Case 3a: Look for other bidi parts on the same visual line
6981      var res = searchInVisualLine(partPos + dir, dir, wrappedLineExtent);
6982      if (res) { return res }
6983  
6984      // Case 3b: Look for other bidi parts on the next visual line
6985      var nextCh = dir > 0 ? wrappedLineExtent.end : mv(wrappedLineExtent.begin, -1);
6986      if (nextCh != null && !(dir > 0 && nextCh == line.text.length)) {
6987        res = searchInVisualLine(dir > 0 ? 0 : bidi.length - 1, dir, getWrappedLineExtent(nextCh));
6988        if (res) { return res }
6989      }
6990  
6991      // Case 4: Nowhere to move
6992      return null
6993    }
6994  
6995    // Commands are parameter-less actions that can be performed on an
6996    // editor, mostly used for keybindings.
6997    var commands = {
6998      selectAll: selectAll,
6999      singleSelection: function (cm) { return cm.setSelection(cm.getCursor("anchor"), cm.getCursor("head"), sel_dontScroll); },
7000      killLine: function (cm) { return deleteNearSelection(cm, function (range) {
7001        if (range.empty()) {
7002          var len = getLine(cm.doc, range.head.line).text.length;
7003          if (range.head.ch == len && range.head.line < cm.lastLine())
7004            { return {from: range.head, to: Pos(range.head.line + 1, 0)} }
7005          else
7006            { return {from: range.head, to: Pos(range.head.line, len)} }
7007        } else {
7008          return {from: range.from(), to: range.to()}
7009        }
7010      }); },
7011      deleteLine: function (cm) { return deleteNearSelection(cm, function (range) { return ({
7012        from: Pos(range.from().line, 0),
7013        to: clipPos(cm.doc, Pos(range.to().line + 1, 0))
7014      }); }); },
7015      delLineLeft: function (cm) { return deleteNearSelection(cm, function (range) { return ({
7016        from: Pos(range.from().line, 0), to: range.from()
7017      }); }); },
7018      delWrappedLineLeft: function (cm) { return deleteNearSelection(cm, function (range) {
7019        var top = cm.charCoords(range.head, "div").top + 5;
7020        var leftPos = cm.coordsChar({left: 0, top: top}, "div");
7021        return {from: leftPos, to: range.from()}
7022      }); },
7023      delWrappedLineRight: function (cm) { return deleteNearSelection(cm, function (range) {
7024        var top = cm.charCoords(range.head, "div").top + 5;
7025        var rightPos = cm.coordsChar({left: cm.display.lineDiv.offsetWidth + 100, top: top}, "div");
7026        return {from: range.from(), to: rightPos }
7027      }); },
7028      undo: function (cm) { return cm.undo(); },
7029      redo: function (cm) { return cm.redo(); },
7030      undoSelection: function (cm) { return cm.undoSelection(); },
7031      redoSelection: function (cm) { return cm.redoSelection(); },
7032      goDocStart: function (cm) { return cm.extendSelection(Pos(cm.firstLine(), 0)); },
7033      goDocEnd: function (cm) { return cm.extendSelection(Pos(cm.lastLine())); },
7034      goLineStart: function (cm) { return cm.extendSelectionsBy(function (range) { return lineStart(cm, range.head.line); },
7035        {origin: "+move", bias: 1}
7036      ); },
7037      goLineStartSmart: function (cm) { return cm.extendSelectionsBy(function (range) { return lineStartSmart(cm, range.head); },
7038        {origin: "+move", bias: 1}
7039      ); },
7040      goLineEnd: function (cm) { return cm.extendSelectionsBy(function (range) { return lineEnd(cm, range.head.line); },
7041        {origin: "+move", bias: -1}
7042      ); },
7043      goLineRight: function (cm) { return cm.extendSelectionsBy(function (range) {
7044        var top = cm.cursorCoords(range.head, "div").top + 5;
7045        return cm.coordsChar({left: cm.display.lineDiv.offsetWidth + 100, top: top}, "div")
7046      }, sel_move); },
7047      goLineLeft: function (cm) { return cm.extendSelectionsBy(function (range) {
7048        var top = cm.cursorCoords(range.head, "div").top + 5;
7049        return cm.coordsChar({left: 0, top: top}, "div")
7050      }, sel_move); },
7051      goLineLeftSmart: function (cm) { return cm.extendSelectionsBy(function (range) {
7052        var top = cm.cursorCoords(range.head, "div").top + 5;
7053        var pos = cm.coordsChar({left: 0, top: top}, "div");
7054        if (pos.ch < cm.getLine(pos.line).search(/\S/)) { return lineStartSmart(cm, range.head) }
7055        return pos
7056      }, sel_move); },
7057      goLineUp: function (cm) { return cm.moveV(-1, "line"); },
7058      goLineDown: function (cm) { return cm.moveV(1, "line"); },
7059      goPageUp: function (cm) { return cm.moveV(-1, "page"); },
7060      goPageDown: function (cm) { return cm.moveV(1, "page"); },
7061      goCharLeft: function (cm) { return cm.moveH(-1, "char"); },
7062      goCharRight: function (cm) { return cm.moveH(1, "char"); },
7063      goColumnLeft: function (cm) { return cm.moveH(-1, "column"); },
7064      goColumnRight: function (cm) { return cm.moveH(1, "column"); },
7065      goWordLeft: function (cm) { return cm.moveH(-1, "word"); },
7066      goGroupRight: function (cm) { return cm.moveH(1, "group"); },
7067      goGroupLeft: function (cm) { return cm.moveH(-1, "group"); },
7068      goWordRight: function (cm) { return cm.moveH(1, "word"); },
7069      delCharBefore: function (cm) { return cm.deleteH(-1, "codepoint"); },
7070      delCharAfter: function (cm) { return cm.deleteH(1, "char"); },
7071      delWordBefore: function (cm) { return cm.deleteH(-1, "word"); },
7072      delWordAfter: function (cm) { return cm.deleteH(1, "word"); },
7073      delGroupBefore: function (cm) { return cm.deleteH(-1, "group"); },
7074      delGroupAfter: function (cm) { return cm.deleteH(1, "group"); },
7075      indentAuto: function (cm) { return cm.indentSelection("smart"); },
7076      indentMore: function (cm) { return cm.indentSelection("add"); },
7077      indentLess: function (cm) { return cm.indentSelection("subtract"); },
7078      insertTab: function (cm) { return cm.replaceSelection("\t"); },
7079      insertSoftTab: function (cm) {
7080        var spaces = [], ranges = cm.listSelections(), tabSize = cm.options.tabSize;
7081        for (var i = 0; i < ranges.length; i++) {
7082          var pos = ranges[i].from();
7083          var col = countColumn(cm.getLine(pos.line), pos.ch, tabSize);
7084          spaces.push(spaceStr(tabSize - col % tabSize));
7085        }
7086        cm.replaceSelections(spaces);
7087      },
7088      defaultTab: function (cm) {
7089        if (cm.somethingSelected()) { cm.indentSelection("add"); }
7090        else { cm.execCommand("insertTab"); }
7091      },
7092      // Swap the two chars left and right of each selection's head.
7093      // Move cursor behind the two swapped characters afterwards.
7094      //
7095      // Doesn't consider line feeds a character.
7096      // Doesn't scan more than one line above to find a character.
7097      // Doesn't do anything on an empty line.
7098      // Doesn't do anything with non-empty selections.
7099      transposeChars: function (cm) { return runInOp(cm, function () {
7100        var ranges = cm.listSelections(), newSel = [];
7101        for (var i = 0; i < ranges.length; i++) {
7102          if (!ranges[i].empty()) { continue }
7103          var cur = ranges[i].head, line = getLine(cm.doc, cur.line).text;
7104          if (line) {
7105            if (cur.ch == line.length) { cur = new Pos(cur.line, cur.ch - 1); }
7106            if (cur.ch > 0) {
7107              cur = new Pos(cur.line, cur.ch + 1);
7108              cm.replaceRange(line.charAt(cur.ch - 1) + line.charAt(cur.ch - 2),
7109                              Pos(cur.line, cur.ch - 2), cur, "+transpose");
7110            } else if (cur.line > cm.doc.first) {
7111              var prev = getLine(cm.doc, cur.line - 1).text;
7112              if (prev) {
7113                cur = new Pos(cur.line, 1);
7114                cm.replaceRange(line.charAt(0) + cm.doc.lineSeparator() +
7115                                prev.charAt(prev.length - 1),
7116                                Pos(cur.line - 1, prev.length - 1), cur, "+transpose");
7117              }
7118            }
7119          }
7120          newSel.push(new Range(cur, cur));
7121        }
7122        cm.setSelections(newSel);
7123      }); },
7124      newlineAndIndent: function (cm) { return runInOp(cm, function () {
7125        var sels = cm.listSelections();
7126        for (var i = sels.length - 1; i >= 0; i--)
7127          { cm.replaceRange(cm.doc.lineSeparator(), sels[i].anchor, sels[i].head, "+input"); }
7128        sels = cm.listSelections();
7129        for (var i$1 = 0; i$1 < sels.length; i$1++)
7130          { cm.indentLine(sels[i$1].from().line, null, true); }
7131        ensureCursorVisible(cm);
7132      }); },
7133      openLine: function (cm) { return cm.replaceSelection("\n", "start"); },
7134      toggleOverwrite: function (cm) { return cm.toggleOverwrite(); }
7135    };
7136  
7137  
7138    function lineStart(cm, lineN) {
7139      var line = getLine(cm.doc, lineN);
7140      var visual = visualLine(line);
7141      if (visual != line) { lineN = lineNo(visual); }
7142      return endOfLine(true, cm, visual, lineN, 1)
7143    }
7144    function lineEnd(cm, lineN) {
7145      var line = getLine(cm.doc, lineN);
7146      var visual = visualLineEnd(line);
7147      if (visual != line) { lineN = lineNo(visual); }
7148      return endOfLine(true, cm, line, lineN, -1)
7149    }
7150    function lineStartSmart(cm, pos) {
7151      var start = lineStart(cm, pos.line);
7152      var line = getLine(cm.doc, start.line);
7153      var order = getOrder(line, cm.doc.direction);
7154      if (!order || order[0].level == 0) {
7155        var firstNonWS = Math.max(start.ch, line.text.search(/\S/));
7156        var inWS = pos.line == start.line && pos.ch <= firstNonWS && pos.ch;
7157        return Pos(start.line, inWS ? 0 : firstNonWS, start.sticky)
7158      }
7159      return start
7160    }
7161  
7162    // Run a handler that was bound to a key.
7163    function doHandleBinding(cm, bound, dropShift) {
7164      if (typeof bound == "string") {
7165        bound = commands[bound];
7166        if (!bound) { return false }
7167      }
7168      // Ensure previous input has been read, so that the handler sees a
7169      // consistent view of the document
7170      cm.display.input.ensurePolled();
7171      var prevShift = cm.display.shift, done = false;
7172      try {
7173        if (cm.isReadOnly()) { cm.state.suppressEdits = true; }
7174        if (dropShift) { cm.display.shift = false; }
7175        done = bound(cm) != Pass;
7176      } finally {
7177        cm.display.shift = prevShift;
7178        cm.state.suppressEdits = false;
7179      }
7180      return done
7181    }
7182  
7183    function lookupKeyForEditor(cm, name, handle) {
7184      for (var i = 0; i < cm.state.keyMaps.length; i++) {
7185        var result = lookupKey(name, cm.state.keyMaps[i], handle, cm);
7186        if (result) { return result }
7187      }
7188      return (cm.options.extraKeys && lookupKey(name, cm.options.extraKeys, handle, cm))
7189        || lookupKey(name, cm.options.keyMap, handle, cm)
7190    }
7191  
7192    // Note that, despite the name, this function is also used to check
7193    // for bound mouse clicks.
7194  
7195    var stopSeq = new Delayed;
7196  
7197    function dispatchKey(cm, name, e, handle) {
7198      var seq = cm.state.keySeq;
7199      if (seq) {
7200        if (isModifierKey(name)) { return "handled" }
7201        if (/\'$/.test(name))
7202          { cm.state.keySeq = null; }
7203        else
7204          { stopSeq.set(50, function () {
7205            if (cm.state.keySeq == seq) {
7206              cm.state.keySeq = null;
7207              cm.display.input.reset();
7208            }
7209          }); }
7210        if (dispatchKeyInner(cm, seq + " " + name, e, handle)) { return true }
7211      }
7212      return dispatchKeyInner(cm, name, e, handle)
7213    }
7214  
7215    function dispatchKeyInner(cm, name, e, handle) {
7216      var result = lookupKeyForEditor(cm, name, handle);
7217  
7218      if (result == "multi")
7219        { cm.state.keySeq = name; }
7220      if (result == "handled")
7221        { signalLater(cm, "keyHandled", cm, name, e); }
7222  
7223      if (result == "handled" || result == "multi") {
7224        e_preventDefault(e);
7225        restartBlink(cm);
7226      }
7227  
7228      return !!result
7229    }
7230  
7231    // Handle a key from the keydown event.
7232    function handleKeyBinding(cm, e) {
7233      var name = keyName(e, true);
7234      if (!name) { return false }
7235  
7236      if (e.shiftKey && !cm.state.keySeq) {
7237        // First try to resolve full name (including 'Shift-'). Failing
7238        // that, see if there is a cursor-motion command (starting with
7239        // 'go') bound to the keyname without 'Shift-'.
7240        return dispatchKey(cm, "Shift-" + name, e, function (b) { return doHandleBinding(cm, b, true); })
7241            || dispatchKey(cm, name, e, function (b) {
7242                 if (typeof b == "string" ? /^go[A-Z]/.test(b) : b.motion)
7243                   { return doHandleBinding(cm, b) }
7244               })
7245      } else {
7246        return dispatchKey(cm, name, e, function (b) { return doHandleBinding(cm, b); })
7247      }
7248    }
7249  
7250    // Handle a key from the keypress event
7251    function handleCharBinding(cm, e, ch) {
7252      return dispatchKey(cm, "'" + ch + "'", e, function (b) { return doHandleBinding(cm, b, true); })
7253    }
7254  
7255    var lastStoppedKey = null;
7256    function onKeyDown(e) {
7257      var cm = this;
7258      if (e.target && e.target != cm.display.input.getField()) { return }
7259      cm.curOp.focus = activeElt();
7260      if (signalDOMEvent(cm, e)) { return }
7261      // IE does strange things with escape.
7262      if (ie && ie_version < 11 && e.keyCode == 27) { e.returnValue = false; }
7263      var code = e.keyCode;
7264      cm.display.shift = code == 16 || e.shiftKey;
7265      var handled = handleKeyBinding(cm, e);
7266      if (presto) {
7267        lastStoppedKey = handled ? code : null;
7268        // Opera has no cut event... we try to at least catch the key combo
7269        if (!handled && code == 88 && !hasCopyEvent && (mac ? e.metaKey : e.ctrlKey))
7270          { cm.replaceSelection("", null, "cut"); }
7271      }
7272      if (gecko && !mac && !handled && code == 46 && e.shiftKey && !e.ctrlKey && document.execCommand)
7273        { document.execCommand("cut"); }
7274  
7275      // Turn mouse into crosshair when Alt is held on Mac.
7276      if (code == 18 && !/\bCodeMirror-crosshair\b/.test(cm.display.lineDiv.className))
7277        { showCrossHair(cm); }
7278    }
7279  
7280    function showCrossHair(cm) {
7281      var lineDiv = cm.display.lineDiv;
7282      addClass(lineDiv, "CodeMirror-crosshair");
7283  
7284      function up(e) {
7285        if (e.keyCode == 18 || !e.altKey) {
7286          rmClass(lineDiv, "CodeMirror-crosshair");
7287          off(document, "keyup", up);
7288          off(document, "mouseover", up);
7289        }
7290      }
7291      on(document, "keyup", up);
7292      on(document, "mouseover", up);
7293    }
7294  
7295    function onKeyUp(e) {
7296      if (e.keyCode == 16) { this.doc.sel.shift = false; }
7297      signalDOMEvent(this, e);
7298    }
7299  
7300    function onKeyPress(e) {
7301      var cm = this;
7302      if (e.target && e.target != cm.display.input.getField()) { return }
7303      if (eventInWidget(cm.display, e) || signalDOMEvent(cm, e) || e.ctrlKey && !e.altKey || mac && e.metaKey) { return }
7304      var keyCode = e.keyCode, charCode = e.charCode;
7305      if (presto && keyCode == lastStoppedKey) {lastStoppedKey = null; e_preventDefault(e); return}
7306      if ((presto && (!e.which || e.which < 10)) && handleKeyBinding(cm, e)) { return }
7307      var ch = String.fromCharCode(charCode == null ? keyCode : charCode);
7308      // Some browsers fire keypress events for backspace
7309      if (ch == "\x08") { return }
7310      if (handleCharBinding(cm, e, ch)) { return }
7311      cm.display.input.onKeyPress(e);
7312    }
7313  
7314    var DOUBLECLICK_DELAY = 400;
7315  
7316    var PastClick = function(time, pos, button) {
7317      this.time = time;
7318      this.pos = pos;
7319      this.button = button;
7320    };
7321  
7322    PastClick.prototype.compare = function (time, pos, button) {
7323      return this.time + DOUBLECLICK_DELAY > time &&
7324        cmp(pos, this.pos) == 0 && button == this.button
7325    };
7326  
7327    var lastClick, lastDoubleClick;
7328    function clickRepeat(pos, button) {
7329      var now = +new Date;
7330      if (lastDoubleClick && lastDoubleClick.compare(now, pos, button)) {
7331        lastClick = lastDoubleClick = null;
7332        return "triple"
7333      } else if (lastClick && lastClick.compare(now, pos, button)) {
7334        lastDoubleClick = new PastClick(now, pos, button);
7335        lastClick = null;
7336        return "double"
7337      } else {
7338        lastClick = new PastClick(now, pos, button);
7339        lastDoubleClick = null;
7340        return "single"
7341      }
7342    }
7343  
7344    // A mouse down can be a single click, double click, triple click,
7345    // start of selection drag, start of text drag, new cursor
7346    // (ctrl-click), rectangle drag (alt-drag), or xwin
7347    // middle-click-paste. Or it might be a click on something we should
7348    // not interfere with, such as a scrollbar or widget.
7349    function onMouseDown(e) {
7350      var cm = this, display = cm.display;
7351      if (signalDOMEvent(cm, e) || display.activeTouch && display.input.supportsTouch()) { return }
7352      display.input.ensurePolled();
7353      display.shift = e.shiftKey;
7354  
7355      if (eventInWidget(display, e)) {
7356        if (!webkit) {
7357          // Briefly turn off draggability, to allow widgets to do
7358          // normal dragging things.
7359          display.scroller.draggable = false;
7360          setTimeout(function () { return display.scroller.draggable = true; }, 100);
7361        }
7362        return
7363      }
7364      if (clickInGutter(cm, e)) { return }
7365      var pos = posFromMouse(cm, e), button = e_button(e), repeat = pos ? clickRepeat(pos, button) : "single";
7366      window.focus();
7367  
7368      // #3261: make sure, that we're not starting a second selection
7369      if (button == 1 && cm.state.selectingText)
7370        { cm.state.selectingText(e); }
7371  
7372      if (pos && handleMappedButton(cm, button, pos, repeat, e)) { return }
7373  
7374      if (button == 1) {
7375        if (pos) { leftButtonDown(cm, pos, repeat, e); }
7376        else if (e_target(e) == display.scroller) { e_preventDefault(e); }
7377      } else if (button == 2) {
7378        if (pos) { extendSelection(cm.doc, pos); }
7379        setTimeout(function () { return display.input.focus(); }, 20);
7380      } else if (button == 3) {
7381        if (captureRightClick) { cm.display.input.onContextMenu(e); }
7382        else { delayBlurEvent(cm); }
7383      }
7384    }
7385  
7386    function handleMappedButton(cm, button, pos, repeat, event) {
7387      var name = "Click";
7388      if (repeat == "double") { name = "Double" + name; }
7389      else if (repeat == "triple") { name = "Triple" + name; }
7390      name = (button == 1 ? "Left" : button == 2 ? "Middle" : "Right") + name;
7391  
7392      return dispatchKey(cm,  addModifierNames(name, event), event, function (bound) {
7393        if (typeof bound == "string") { bound = commands[bound]; }
7394        if (!bound) { return false }
7395        var done = false;
7396        try {
7397          if (cm.isReadOnly()) { cm.state.suppressEdits = true; }
7398          done = bound(cm, pos) != Pass;
7399        } finally {
7400          cm.state.suppressEdits = false;
7401        }
7402        return done
7403      })
7404    }
7405  
7406    function configureMouse(cm, repeat, event) {
7407      var option = cm.getOption("configureMouse");
7408      var value = option ? option(cm, repeat, event) : {};
7409      if (value.unit == null) {
7410        var rect = chromeOS ? event.shiftKey && event.metaKey : event.altKey;
7411        value.unit = rect ? "rectangle" : repeat == "single" ? "char" : repeat == "double" ? "word" : "line";
7412      }
7413      if (value.extend == null || cm.doc.extend) { value.extend = cm.doc.extend || event.shiftKey; }
7414      if (value.addNew == null) { value.addNew = mac ? event.metaKey : event.ctrlKey; }
7415      if (value.moveOnDrag == null) { value.moveOnDrag = !(mac ? event.altKey : event.ctrlKey); }
7416      return value
7417    }
7418  
7419    function leftButtonDown(cm, pos, repeat, event) {
7420      if (ie) { setTimeout(bind(ensureFocus, cm), 0); }
7421      else { cm.curOp.focus = activeElt(); }
7422  
7423      var behavior = configureMouse(cm, repeat, event);
7424  
7425      var sel = cm.doc.sel, contained;
7426      if (cm.options.dragDrop && dragAndDrop && !cm.isReadOnly() &&
7427          repeat == "single" && (contained = sel.contains(pos)) > -1 &&
7428          (cmp((contained = sel.ranges[contained]).from(), pos) < 0 || pos.xRel > 0) &&
7429          (cmp(contained.to(), pos) > 0 || pos.xRel < 0))
7430        { leftButtonStartDrag(cm, event, pos, behavior); }
7431      else
7432        { leftButtonSelect(cm, event, pos, behavior); }
7433    }
7434  
7435    // Start a text drag. When it ends, see if any dragging actually
7436    // happen, and treat as a click if it didn't.
7437    function leftButtonStartDrag(cm, event, pos, behavior) {
7438      var display = cm.display, moved = false;
7439      var dragEnd = operation(cm, function (e) {
7440        if (webkit) { display.scroller.draggable = false; }
7441        cm.state.draggingText = false;
7442        if (cm.state.delayingBlurEvent) {
7443          if (cm.hasFocus()) { cm.state.delayingBlurEvent = false; }
7444          else { delayBlurEvent(cm); }
7445        }
7446        off(display.wrapper.ownerDocument, "mouseup", dragEnd);
7447        off(display.wrapper.ownerDocument, "mousemove", mouseMove);
7448        off(display.scroller, "dragstart", dragStart);
7449        off(display.scroller, "drop", dragEnd);
7450        if (!moved) {
7451          e_preventDefault(e);
7452          if (!behavior.addNew)
7453            { extendSelection(cm.doc, pos, null, null, behavior.extend); }
7454          // Work around unexplainable focus problem in IE9 (#2127) and Chrome (#3081)
7455          if ((webkit && !safari) || ie && ie_version == 9)
7456            { setTimeout(function () {display.wrapper.ownerDocument.body.focus({preventScroll: true}); display.input.focus();}, 20); }
7457          else
7458            { display.input.focus(); }
7459        }
7460      });
7461      var mouseMove = function(e2) {
7462        moved = moved || Math.abs(event.clientX - e2.clientX) + Math.abs(event.clientY - e2.clientY) >= 10;
7463      };
7464      var dragStart = function () { return moved = true; };
7465      // Let the drag handler handle this.
7466      if (webkit) { display.scroller.draggable = true; }
7467      cm.state.draggingText = dragEnd;
7468      dragEnd.copy = !behavior.moveOnDrag;
7469      on(display.wrapper.ownerDocument, "mouseup", dragEnd);
7470      on(display.wrapper.ownerDocument, "mousemove", mouseMove);
7471      on(display.scroller, "dragstart", dragStart);
7472      on(display.scroller, "drop", dragEnd);
7473  
7474      cm.state.delayingBlurEvent = true;
7475      setTimeout(function () { return display.input.focus(); }, 20);
7476      // IE's approach to draggable
7477      if (display.scroller.dragDrop) { display.scroller.dragDrop(); }
7478    }
7479  
7480    function rangeForUnit(cm, pos, unit) {
7481      if (unit == "char") { return new Range(pos, pos) }
7482      if (unit == "word") { return cm.findWordAt(pos) }
7483      if (unit == "line") { return new Range(Pos(pos.line, 0), clipPos(cm.doc, Pos(pos.line + 1, 0))) }
7484      var result = unit(cm, pos);
7485      return new Range(result.from, result.to)
7486    }
7487  
7488    // Normal selection, as opposed to text dragging.
7489    function leftButtonSelect(cm, event, start, behavior) {
7490      if (ie) { delayBlurEvent(cm); }
7491      var display = cm.display, doc = cm.doc;
7492      e_preventDefault(event);
7493  
7494      var ourRange, ourIndex, startSel = doc.sel, ranges = startSel.ranges;
7495      if (behavior.addNew && !behavior.extend) {
7496        ourIndex = doc.sel.contains(start);
7497        if (ourIndex > -1)
7498          { ourRange = ranges[ourIndex]; }
7499        else
7500          { ourRange = new Range(start, start); }
7501      } else {
7502        ourRange = doc.sel.primary();
7503        ourIndex = doc.sel.primIndex;
7504      }
7505  
7506      if (behavior.unit == "rectangle") {
7507        if (!behavior.addNew) { ourRange = new Range(start, start); }
7508        start = posFromMouse(cm, event, true, true);
7509        ourIndex = -1;
7510      } else {
7511        var range = rangeForUnit(cm, start, behavior.unit);
7512        if (behavior.extend)
7513          { ourRange = extendRange(ourRange, range.anchor, range.head, behavior.extend); }
7514        else
7515          { ourRange = range; }
7516      }
7517  
7518      if (!behavior.addNew) {
7519        ourIndex = 0;
7520        setSelection(doc, new Selection([ourRange], 0), sel_mouse);
7521        startSel = doc.sel;
7522      } else if (ourIndex == -1) {
7523        ourIndex = ranges.length;
7524        setSelection(doc, normalizeSelection(cm, ranges.concat([ourRange]), ourIndex),
7525                     {scroll: false, origin: "*mouse"});
7526      } else if (ranges.length > 1 && ranges[ourIndex].empty() && behavior.unit == "char" && !behavior.extend) {
7527        setSelection(doc, normalizeSelection(cm, ranges.slice(0, ourIndex).concat(ranges.slice(ourIndex + 1)), 0),
7528                     {scroll: false, origin: "*mouse"});
7529        startSel = doc.sel;
7530      } else {
7531        replaceOneSelection(doc, ourIndex, ourRange, sel_mouse);
7532      }
7533  
7534      var lastPos = start;
7535      function extendTo(pos) {
7536        if (cmp(lastPos, pos) == 0) { return }
7537        lastPos = pos;
7538  
7539        if (behavior.unit == "rectangle") {
7540          var ranges = [], tabSize = cm.options.tabSize;
7541          var startCol = countColumn(getLine(doc, start.line).text, start.ch, tabSize);
7542          var posCol = countColumn(getLine(doc, pos.line).text, pos.ch, tabSize);
7543          var left = Math.min(startCol, posCol), right = Math.max(startCol, posCol);
7544          for (var line = Math.min(start.line, pos.line), end = Math.min(cm.lastLine(), Math.max(start.line, pos.line));
7545               line <= end; line++) {
7546            var text = getLine(doc, line).text, leftPos = findColumn(text, left, tabSize);
7547            if (left == right)
7548              { ranges.push(new Range(Pos(line, leftPos), Pos(line, leftPos))); }
7549            else if (text.length > leftPos)
7550              { ranges.push(new Range(Pos(line, leftPos), Pos(line, findColumn(text, right, tabSize)))); }
7551          }
7552          if (!ranges.length) { ranges.push(new Range(start, start)); }
7553          setSelection(doc, normalizeSelection(cm, startSel.ranges.slice(0, ourIndex).concat(ranges), ourIndex),
7554                       {origin: "*mouse", scroll: false});
7555          cm.scrollIntoView(pos);
7556        } else {
7557          var oldRange = ourRange;
7558          var range = rangeForUnit(cm, pos, behavior.unit);
7559          var anchor = oldRange.anchor, head;
7560          if (cmp(range.anchor, anchor) > 0) {
7561            head = range.head;
7562            anchor = minPos(oldRange.from(), range.anchor);
7563          } else {
7564            head = range.anchor;
7565            anchor = maxPos(oldRange.to(), range.head);
7566          }
7567          var ranges$1 = startSel.ranges.slice(0);
7568          ranges$1[ourIndex] = bidiSimplify(cm, new Range(clipPos(doc, anchor), head));
7569          setSelection(doc, normalizeSelection(cm, ranges$1, ourIndex), sel_mouse);
7570        }
7571      }
7572  
7573      var editorSize = display.wrapper.getBoundingClientRect();
7574      // Used to ensure timeout re-tries don't fire when another extend
7575      // happened in the meantime (clearTimeout isn't reliable -- at
7576      // least on Chrome, the timeouts still happen even when cleared,
7577      // if the clear happens after their scheduled firing time).
7578      var counter = 0;
7579  
7580      function extend(e) {
7581        var curCount = ++counter;
7582        var cur = posFromMouse(cm, e, true, behavior.unit == "rectangle");
7583        if (!cur) { return }
7584        if (cmp(cur, lastPos) != 0) {
7585          cm.curOp.focus = activeElt();
7586          extendTo(cur);
7587          var visible = visibleLines(display, doc);
7588          if (cur.line >= visible.to || cur.line < visible.from)
7589            { setTimeout(operation(cm, function () {if (counter == curCount) { extend(e); }}), 150); }
7590        } else {
7591          var outside = e.clientY < editorSize.top ? -20 : e.clientY > editorSize.bottom ? 20 : 0;
7592          if (outside) { setTimeout(operation(cm, function () {
7593            if (counter != curCount) { return }
7594            display.scroller.scrollTop += outside;
7595            extend(e);
7596          }), 50); }
7597        }
7598      }
7599  
7600      function done(e) {
7601        cm.state.selectingText = false;
7602        counter = Infinity;
7603        // If e is null or undefined we interpret this as someone trying
7604        // to explicitly cancel the selection rather than the user
7605        // letting go of the mouse button.
7606        if (e) {
7607          e_preventDefault(e);
7608          display.input.focus();
7609        }
7610        off(display.wrapper.ownerDocument, "mousemove", move);
7611        off(display.wrapper.ownerDocument, "mouseup", up);
7612        doc.history.lastSelOrigin = null;
7613      }
7614  
7615      var move = operation(cm, function (e) {
7616        if (e.buttons === 0 || !e_button(e)) { done(e); }
7617        else { extend(e); }
7618      });
7619      var up = operation(cm, done);
7620      cm.state.selectingText = up;
7621      on(display.wrapper.ownerDocument, "mousemove", move);
7622      on(display.wrapper.ownerDocument, "mouseup", up);
7623    }
7624  
7625    // Used when mouse-selecting to adjust the anchor to the proper side
7626    // of a bidi jump depending on the visual position of the head.
7627    function bidiSimplify(cm, range) {
7628      var anchor = range.anchor;
7629      var head = range.head;
7630      var anchorLine = getLine(cm.doc, anchor.line);
7631      if (cmp(anchor, head) == 0 && anchor.sticky == head.sticky) { return range }
7632      var order = getOrder(anchorLine);
7633      if (!order) { return range }
7634      var index = getBidiPartAt(order, anchor.ch, anchor.sticky), part = order[index];
7635      if (part.from != anchor.ch && part.to != anchor.ch) { return range }
7636      var boundary = index + ((part.from == anchor.ch) == (part.level != 1) ? 0 : 1);
7637      if (boundary == 0 || boundary == order.length) { return range }
7638  
7639      // Compute the relative visual position of the head compared to the
7640      // anchor (<0 is to the left, >0 to the right)
7641      var leftSide;
7642      if (head.line != anchor.line) {
7643        leftSide = (head.line - anchor.line) * (cm.doc.direction == "ltr" ? 1 : -1) > 0;
7644      } else {
7645        var headIndex = getBidiPartAt(order, head.ch, head.sticky);
7646        var dir = headIndex - index || (head.ch - anchor.ch) * (part.level == 1 ? -1 : 1);
7647        if (headIndex == boundary - 1 || headIndex == boundary)
7648          { leftSide = dir < 0; }
7649        else
7650          { leftSide = dir > 0; }
7651      }
7652  
7653      var usePart = order[boundary + (leftSide ? -1 : 0)];
7654      var from = leftSide == (usePart.level == 1);
7655      var ch = from ? usePart.from : usePart.to, sticky = from ? "after" : "before";
7656      return anchor.ch == ch && anchor.sticky == sticky ? range : new Range(new Pos(anchor.line, ch, sticky), head)
7657    }
7658  
7659  
7660    // Determines whether an event happened in the gutter, and fires the
7661    // handlers for the corresponding event.
7662    function gutterEvent(cm, e, type, prevent) {
7663      var mX, mY;
7664      if (e.touches) {
7665        mX = e.touches[0].clientX;
7666        mY = e.touches[0].clientY;
7667      } else {
7668        try { mX = e.clientX; mY = e.clientY; }
7669        catch(e$1) { return false }
7670      }
7671      if (mX >= Math.floor(cm.display.gutters.getBoundingClientRect().right)) { return false }
7672      if (prevent) { e_preventDefault(e); }
7673  
7674      var display = cm.display;
7675      var lineBox = display.lineDiv.getBoundingClientRect();
7676  
7677      if (mY > lineBox.bottom || !hasHandler(cm, type)) { return e_defaultPrevented(e) }
7678      mY -= lineBox.top - display.viewOffset;
7679  
7680      for (var i = 0; i < cm.display.gutterSpecs.length; ++i) {
7681        var g = display.gutters.childNodes[i];
7682        if (g && g.getBoundingClientRect().right >= mX) {
7683          var line = lineAtHeight(cm.doc, mY);
7684          var gutter = cm.display.gutterSpecs[i];
7685          signal(cm, type, cm, line, gutter.className, e);
7686          return e_defaultPrevented(e)
7687        }
7688      }
7689    }
7690  
7691    function clickInGutter(cm, e) {
7692      return gutterEvent(cm, e, "gutterClick", true)
7693    }
7694  
7695    // CONTEXT MENU HANDLING
7696  
7697    // To make the context menu work, we need to briefly unhide the
7698    // textarea (making it as unobtrusive as possible) to let the
7699    // right-click take effect on it.
7700    function onContextMenu(cm, e) {
7701      if (eventInWidget(cm.display, e) || contextMenuInGutter(cm, e)) { return }
7702      if (signalDOMEvent(cm, e, "contextmenu")) { return }
7703      if (!captureRightClick) { cm.display.input.onContextMenu(e); }
7704    }
7705  
7706    function contextMenuInGutter(cm, e) {
7707      if (!hasHandler(cm, "gutterContextMenu")) { return false }
7708      return gutterEvent(cm, e, "gutterContextMenu", false)
7709    }
7710  
7711    function themeChanged(cm) {
7712      cm.display.wrapper.className = cm.display.wrapper.className.replace(/\s*cm-s-\S+/g, "") +
7713        cm.options.theme.replace(/(^|\s)\s*/g, " cm-s-");
7714      clearCaches(cm);
7715    }
7716  
7717    var Init = {toString: function(){return "CodeMirror.Init"}};
7718  
7719    var defaults = {};
7720    var optionHandlers = {};
7721  
7722    function defineOptions(CodeMirror) {
7723      var optionHandlers = CodeMirror.optionHandlers;
7724  
7725      function option(name, deflt, handle, notOnInit) {
7726        CodeMirror.defaults[name] = deflt;
7727        if (handle) { optionHandlers[name] =
7728          notOnInit ? function (cm, val, old) {if (old != Init) { handle(cm, val, old); }} : handle; }
7729      }
7730  
7731      CodeMirror.defineOption = option;
7732  
7733      // Passed to option handlers when there is no old value.
7734      CodeMirror.Init = Init;
7735  
7736      // These two are, on init, called from the constructor because they
7737      // have to be initialized before the editor can start at all.
7738      option("value", "", function (cm, val) { return cm.setValue(val); }, true);
7739      option("mode", null, function (cm, val) {
7740        cm.doc.modeOption = val;
7741        loadMode(cm);
7742      }, true);
7743  
7744      option("indentUnit", 2, loadMode, true);
7745      option("indentWithTabs", false);
7746      option("smartIndent", true);
7747      option("tabSize", 4, function (cm) {
7748        resetModeState(cm);
7749        clearCaches(cm);
7750        regChange(cm);
7751      }, true);
7752  
7753      option("lineSeparator", null, function (cm, val) {
7754        cm.doc.lineSep = val;
7755        if (!val) { return }
7756        var newBreaks = [], lineNo = cm.doc.first;
7757        cm.doc.iter(function (line) {
7758          for (var pos = 0;;) {
7759            var found = line.text.indexOf(val, pos);
7760            if (found == -1) { break }
7761            pos = found + val.length;
7762            newBreaks.push(Pos(lineNo, found));
7763          }
7764          lineNo++;
7765        });
7766        for (var i = newBreaks.length - 1; i >= 0; i--)
7767          { replaceRange(cm.doc, val, newBreaks[i], Pos(newBreaks[i].line, newBreaks[i].ch + val.length)); }
7768      });
7769      option("specialChars", /[\u0000-\u001f\u007f-\u009f\u00ad\u061c\u200b\u200e\u200f\u2028\u2029\ufeff\ufff9-\ufffc]/g, function (cm, val, old) {
7770        cm.state.specialChars = new RegExp(val.source + (val.test("\t") ? "" : "|\t"), "g");
7771        if (old != Init) { cm.refresh(); }
7772      });
7773      option("specialCharPlaceholder", defaultSpecialCharPlaceholder, function (cm) { return cm.refresh(); }, true);
7774      option("electricChars", true);
7775      option("inputStyle", mobile ? "contenteditable" : "textarea", function () {
7776        throw new Error("inputStyle can not (yet) be changed in a running editor") // FIXME
7777      }, true);
7778      option("spellcheck", false, function (cm, val) { return cm.getInputField().spellcheck = val; }, true);
7779      option("autocorrect", false, function (cm, val) { return cm.getInputField().autocorrect = val; }, true);
7780      option("autocapitalize", false, function (cm, val) { return cm.getInputField().autocapitalize = val; }, true);
7781      option("rtlMoveVisually", !windows);
7782      option("wholeLineUpdateBefore", true);
7783  
7784      option("theme", "default", function (cm) {
7785        themeChanged(cm);
7786        updateGutters(cm);
7787      }, true);
7788      option("keyMap", "default", function (cm, val, old) {
7789        var next = getKeyMap(val);
7790        var prev = old != Init && getKeyMap(old);
7791        if (prev && prev.detach) { prev.detach(cm, next); }
7792        if (next.attach) { next.attach(cm, prev || null); }
7793      });
7794      option("extraKeys", null);
7795      option("configureMouse", null);
7796  
7797      option("lineWrapping", false, wrappingChanged, true);
7798      option("gutters", [], function (cm, val) {
7799        cm.display.gutterSpecs = getGutters(val, cm.options.lineNumbers);
7800        updateGutters(cm);
7801      }, true);
7802      option("fixedGutter", true, function (cm, val) {
7803        cm.display.gutters.style.left = val ? compensateForHScroll(cm.display) + "px" : "0";
7804        cm.refresh();
7805      }, true);
7806      option("coverGutterNextToScrollbar", false, function (cm) { return updateScrollbars(cm); }, true);
7807      option("scrollbarStyle", "native", function (cm) {
7808        initScrollbars(cm);
7809        updateScrollbars(cm);
7810        cm.display.scrollbars.setScrollTop(cm.doc.scrollTop);
7811        cm.display.scrollbars.setScrollLeft(cm.doc.scrollLeft);
7812      }, true);
7813      option("lineNumbers", false, function (cm, val) {
7814        cm.display.gutterSpecs = getGutters(cm.options.gutters, val);
7815        updateGutters(cm);
7816      }, true);
7817      option("firstLineNumber", 1, updateGutters, true);
7818      option("lineNumberFormatter", function (integer) { return integer; }, updateGutters, true);
7819      option("showCursorWhenSelecting", false, updateSelection, true);
7820  
7821      option("resetSelectionOnContextMenu", true);
7822      option("lineWiseCopyCut", true);
7823      option("pasteLinesPerSelection", true);
7824      option("selectionsMayTouch", false);
7825  
7826      option("readOnly", false, function (cm, val) {
7827        if (val == "nocursor") {
7828          onBlur(cm);
7829          cm.display.input.blur();
7830        }
7831        cm.display.input.readOnlyChanged(val);
7832      });
7833  
7834      option("screenReaderLabel", null, function (cm, val) {
7835        val = (val === '') ? null : val;
7836        cm.display.input.screenReaderLabelChanged(val);
7837      });
7838  
7839      option("disableInput", false, function (cm, val) {if (!val) { cm.display.input.reset(); }}, true);
7840      option("dragDrop", true, dragDropChanged);
7841      option("allowDropFileTypes", null);
7842  
7843      option("cursorBlinkRate", 530);
7844      option("cursorScrollMargin", 0);
7845      option("cursorHeight", 1, updateSelection, true);
7846      option("singleCursorHeightPerLine", true, updateSelection, true);
7847      option("workTime", 100);
7848      option("workDelay", 100);
7849      option("flattenSpans", true, resetModeState, true);
7850      option("addModeClass", false, resetModeState, true);
7851      option("pollInterval", 100);
7852      option("undoDepth", 200, function (cm, val) { return cm.doc.history.undoDepth = val; });
7853      option("historyEventDelay", 1250);
7854      option("viewportMargin", 10, function (cm) { return cm.refresh(); }, true);
7855      option("maxHighlightLength", 10000, resetModeState, true);
7856      option("moveInputWithCursor", true, function (cm, val) {
7857        if (!val) { cm.display.input.resetPosition(); }
7858      });
7859  
7860      option("tabindex", null, function (cm, val) { return cm.display.input.getField().tabIndex = val || ""; });
7861      option("autofocus", null);
7862      option("direction", "ltr", function (cm, val) { return cm.doc.setDirection(val); }, true);
7863      option("phrases", null);
7864    }
7865  
7866    function dragDropChanged(cm, value, old) {
7867      var wasOn = old && old != Init;
7868      if (!value != !wasOn) {
7869        var funcs = cm.display.dragFunctions;
7870        var toggle = value ? on : off;
7871        toggle(cm.display.scroller, "dragstart", funcs.start);
7872        toggle(cm.display.scroller, "dragenter", funcs.enter);
7873        toggle(cm.display.scroller, "dragover", funcs.over);
7874        toggle(cm.display.scroller, "dragleave", funcs.leave);
7875        toggle(cm.display.scroller, "drop", funcs.drop);
7876      }
7877    }
7878  
7879    function wrappingChanged(cm) {
7880      if (cm.options.lineWrapping) {
7881        addClass(cm.display.wrapper, "CodeMirror-wrap");
7882        cm.display.sizer.style.minWidth = "";
7883        cm.display.sizerWidth = null;
7884      } else {
7885        rmClass(cm.display.wrapper, "CodeMirror-wrap");
7886        findMaxLine(cm);
7887      }
7888      estimateLineHeights(cm);
7889      regChange(cm);
7890      clearCaches(cm);
7891      setTimeout(function () { return updateScrollbars(cm); }, 100);
7892    }
7893  
7894    // A CodeMirror instance represents an editor. This is the object
7895    // that user code is usually dealing with.
7896  
7897    function CodeMirror(place, options) {
7898      var this$1 = this;
7899  
7900      if (!(this instanceof CodeMirror)) { return new CodeMirror(place, options) }
7901  
7902      this.options = options = options ? copyObj(options) : {};
7903      // Determine effective options based on given values and defaults.
7904      copyObj(defaults, options, false);
7905  
7906      var doc = options.value;
7907      if (typeof doc == "string") { doc = new Doc(doc, options.mode, null, options.lineSeparator, options.direction); }
7908      else if (options.mode) { doc.modeOption = options.mode; }
7909      this.doc = doc;
7910  
7911      var input = new CodeMirror.inputStyles[options.inputStyle](this);
7912      var display = this.display = new Display(place, doc, input, options);
7913      display.wrapper.CodeMirror = this;
7914      themeChanged(this);
7915      if (options.lineWrapping)
7916        { this.display.wrapper.className += " CodeMirror-wrap"; }
7917      initScrollbars(this);
7918  
7919      this.state = {
7920        keyMaps: [],  // stores maps added by addKeyMap
7921        overlays: [], // highlighting overlays, as added by addOverlay
7922        modeGen: 0,   // bumped when mode/overlay changes, used to invalidate highlighting info
7923        overwrite: false,
7924        delayingBlurEvent: false,
7925        focused: false,
7926        suppressEdits: false, // used to disable editing during key handlers when in readOnly mode
7927        pasteIncoming: -1, cutIncoming: -1, // help recognize paste/cut edits in input.poll
7928        selectingText: false,
7929        draggingText: false,
7930        highlight: new Delayed(), // stores highlight worker timeout
7931        keySeq: null,  // Unfinished key sequence
7932        specialChars: null
7933      };
7934  
7935      if (options.autofocus && !mobile) { display.input.focus(); }
7936  
7937      // Override magic textarea content restore that IE sometimes does
7938      // on our hidden textarea on reload
7939      if (ie && ie_version < 11) { setTimeout(function () { return this$1.display.input.reset(true); }, 20); }
7940  
7941      registerEventHandlers(this);
7942      ensureGlobalHandlers();
7943  
7944      startOperation(this);
7945      this.curOp.forceUpdate = true;
7946      attachDoc(this, doc);
7947  
7948      if ((options.autofocus && !mobile) || this.hasFocus())
7949        { setTimeout(function () {
7950          if (this$1.hasFocus() && !this$1.state.focused) { onFocus(this$1); }
7951        }, 20); }
7952      else
7953        { onBlur(this); }
7954  
7955      for (var opt in optionHandlers) { if (optionHandlers.hasOwnProperty(opt))
7956        { optionHandlers[opt](this, options[opt], Init); } }
7957      maybeUpdateLineNumberWidth(this);
7958      if (options.finishInit) { options.finishInit(this); }
7959      for (var i = 0; i < initHooks.length; ++i) { initHooks[i](this); }
7960      endOperation(this);
7961      // Suppress optimizelegibility in Webkit, since it breaks text
7962      // measuring on line wrapping boundaries.
7963      if (webkit && options.lineWrapping &&
7964          getComputedStyle(display.lineDiv).textRendering == "optimizelegibility")
7965        { display.lineDiv.style.textRendering = "auto"; }
7966    }
7967  
7968    // The default configuration options.
7969    CodeMirror.defaults = defaults;
7970    // Functions to run when options are changed.
7971    CodeMirror.optionHandlers = optionHandlers;
7972  
7973    // Attach the necessary event handlers when initializing the editor
7974    function registerEventHandlers(cm) {
7975      var d = cm.display;
7976      on(d.scroller, "mousedown", operation(cm, onMouseDown));
7977      // Older IE's will not fire a second mousedown for a double click
7978      if (ie && ie_version < 11)
7979        { on(d.scroller, "dblclick", operation(cm, function (e) {
7980          if (signalDOMEvent(cm, e)) { return }
7981          var pos = posFromMouse(cm, e);
7982          if (!pos || clickInGutter(cm, e) || eventInWidget(cm.display, e)) { return }
7983          e_preventDefault(e);
7984          var word = cm.findWordAt(pos);
7985          extendSelection(cm.doc, word.anchor, word.head);
7986        })); }
7987      else
7988        { on(d.scroller, "dblclick", function (e) { return signalDOMEvent(cm, e) || e_preventDefault(e); }); }
7989      // Some browsers fire contextmenu *after* opening the menu, at
7990      // which point we can't mess with it anymore. Context menu is
7991      // handled in onMouseDown for these browsers.
7992      on(d.scroller, "contextmenu", function (e) { return onContextMenu(cm, e); });
7993      on(d.input.getField(), "contextmenu", function (e) {
7994        if (!d.scroller.contains(e.target)) { onContextMenu(cm, e); }
7995      });
7996  
7997      // Used to suppress mouse event handling when a touch happens
7998      var touchFinished, prevTouch = {end: 0};
7999      function finishTouch() {
8000        if (d.activeTouch) {
8001          touchFinished = setTimeout(function () { return d.activeTouch = null; }, 1000);
8002          prevTouch = d.activeTouch;
8003          prevTouch.end = +new Date;
8004        }
8005      }
8006      function isMouseLikeTouchEvent(e) {
8007        if (e.touches.length != 1) { return false }
8008        var touch = e.touches[0];
8009        return touch.radiusX <= 1 && touch.radiusY <= 1
8010      }
8011      function farAway(touch, other) {
8012        if (other.left == null) { return true }
8013        var dx = other.left - touch.left, dy = other.top - touch.top;
8014        return dx * dx + dy * dy > 20 * 20
8015      }
8016      on(d.scroller, "touchstart", function (e) {
8017        if (!signalDOMEvent(cm, e) && !isMouseLikeTouchEvent(e) && !clickInGutter(cm, e)) {
8018          d.input.ensurePolled();
8019          clearTimeout(touchFinished);
8020          var now = +new Date;
8021          d.activeTouch = {start: now, moved: false,
8022                           prev: now - prevTouch.end <= 300 ? prevTouch : null};
8023          if (e.touches.length == 1) {
8024            d.activeTouch.left = e.touches[0].pageX;
8025            d.activeTouch.top = e.touches[0].pageY;
8026          }
8027        }
8028      });
8029      on(d.scroller, "touchmove", function () {
8030        if (d.activeTouch) { d.activeTouch.moved = true; }
8031      });
8032      on(d.scroller, "touchend", function (e) {
8033        var touch = d.activeTouch;
8034        if (touch && !eventInWidget(d, e) && touch.left != null &&
8035            !touch.moved && new Date - touch.start < 300) {
8036          var pos = cm.coordsChar(d.activeTouch, "page"), range;
8037          if (!touch.prev || farAway(touch, touch.prev)) // Single tap
8038            { range = new Range(pos, pos); }
8039          else if (!touch.prev.prev || farAway(touch, touch.prev.prev)) // Double tap
8040            { range = cm.findWordAt(pos); }
8041          else // Triple tap
8042            { range = new Range(Pos(pos.line, 0), clipPos(cm.doc, Pos(pos.line + 1, 0))); }
8043          cm.setSelection(range.anchor, range.head);
8044          cm.focus();
8045          e_preventDefault(e);
8046        }
8047        finishTouch();
8048      });
8049      on(d.scroller, "touchcancel", finishTouch);
8050  
8051      // Sync scrolling between fake scrollbars and real scrollable
8052      // area, ensure viewport is updated when scrolling.
8053      on(d.scroller, "scroll", function () {
8054        if (d.scroller.clientHeight) {
8055          updateScrollTop(cm, d.scroller.scrollTop);
8056          setScrollLeft(cm, d.scroller.scrollLeft, true);
8057          signal(cm, "scroll", cm);
8058        }
8059      });
8060  
8061      // Listen to wheel events in order to try and update the viewport on time.
8062      on(d.scroller, "mousewheel", function (e) { return onScrollWheel(cm, e); });
8063      on(d.scroller, "DOMMouseScroll", function (e) { return onScrollWheel(cm, e); });
8064  
8065      // Prevent wrapper from ever scrolling
8066      on(d.wrapper, "scroll", function () { return d.wrapper.scrollTop = d.wrapper.scrollLeft = 0; });
8067  
8068      d.dragFunctions = {
8069        enter: function (e) {if (!signalDOMEvent(cm, e)) { e_stop(e); }},
8070        over: function (e) {if (!signalDOMEvent(cm, e)) { onDragOver(cm, e); e_stop(e); }},
8071        start: function (e) { return onDragStart(cm, e); },
8072        drop: operation(cm, onDrop),
8073        leave: function (e) {if (!signalDOMEvent(cm, e)) { clearDragCursor(cm); }}
8074      };
8075  
8076      var inp = d.input.getField();
8077      on(inp, "keyup", function (e) { return onKeyUp.call(cm, e); });
8078      on(inp, "keydown", operation(cm, onKeyDown));
8079      on(inp, "keypress", operation(cm, onKeyPress));
8080      on(inp, "focus", function (e) { return onFocus(cm, e); });
8081      on(inp, "blur", function (e) { return onBlur(cm, e); });
8082    }
8083  
8084    var initHooks = [];
8085    CodeMirror.defineInitHook = function (f) { return initHooks.push(f); };
8086  
8087    // Indent the given line. The how parameter can be "smart",
8088    // "add"/null, "subtract", or "prev". When aggressive is false
8089    // (typically set to true for forced single-line indents), empty
8090    // lines are not indented, and places where the mode returns Pass
8091    // are left alone.
8092    function indentLine(cm, n, how, aggressive) {
8093      var doc = cm.doc, state;
8094      if (how == null) { how = "add"; }
8095      if (how == "smart") {
8096        // Fall back to "prev" when the mode doesn't have an indentation
8097        // method.
8098        if (!doc.mode.indent) { how = "prev"; }
8099        else { state = getContextBefore(cm, n).state; }
8100      }
8101  
8102      var tabSize = cm.options.tabSize;
8103      var line = getLine(doc, n), curSpace = countColumn(line.text, null, tabSize);
8104      if (line.stateAfter) { line.stateAfter = null; }
8105      var curSpaceString = line.text.match(/^\s*/)[0], indentation;
8106      if (!aggressive && !/\S/.test(line.text)) {
8107        indentation = 0;
8108        how = "not";
8109      } else if (how == "smart") {
8110        indentation = doc.mode.indent(state, line.text.slice(curSpaceString.length), line.text);
8111        if (indentation == Pass || indentation > 150) {
8112          if (!aggressive) { return }
8113          how = "prev";
8114        }
8115      }
8116      if (how == "prev") {
8117        if (n > doc.first) { indentation = countColumn(getLine(doc, n-1).text, null, tabSize); }
8118        else { indentation = 0; }
8119      } else if (how == "add") {
8120        indentation = curSpace + cm.options.indentUnit;
8121      } else if (how == "subtract") {
8122        indentation = curSpace - cm.options.indentUnit;
8123      } else if (typeof how == "number") {
8124        indentation = curSpace + how;
8125      }
8126      indentation = Math.max(0, indentation);
8127  
8128      var indentString = "", pos = 0;
8129      if (cm.options.indentWithTabs)
8130        { for (var i = Math.floor(indentation / tabSize); i; --i) {pos += tabSize; indentString += "\t";} }
8131      if (pos < indentation) { indentString += spaceStr(indentation - pos); }
8132  
8133      if (indentString != curSpaceString) {
8134        replaceRange(doc, indentString, Pos(n, 0), Pos(n, curSpaceString.length), "+input");
8135        line.stateAfter = null;
8136        return true
8137      } else {
8138        // Ensure that, if the cursor was in the whitespace at the start
8139        // of the line, it is moved to the end of that space.
8140        for (var i$1 = 0; i$1 < doc.sel.ranges.length; i$1++) {
8141          var range = doc.sel.ranges[i$1];
8142          if (range.head.line == n && range.head.ch < curSpaceString.length) {
8143            var pos$1 = Pos(n, curSpaceString.length);
8144            replaceOneSelection(doc, i$1, new Range(pos$1, pos$1));
8145            break
8146          }
8147        }
8148      }
8149    }
8150  
8151    // This will be set to a {lineWise: bool, text: [string]} object, so
8152    // that, when pasting, we know what kind of selections the copied
8153    // text was made out of.
8154    var lastCopied = null;
8155  
8156    function setLastCopied(newLastCopied) {
8157      lastCopied = newLastCopied;
8158    }
8159  
8160    function applyTextInput(cm, inserted, deleted, sel, origin) {
8161      var doc = cm.doc;
8162      cm.display.shift = false;
8163      if (!sel) { sel = doc.sel; }
8164  
8165      var recent = +new Date - 200;
8166      var paste = origin == "paste" || cm.state.pasteIncoming > recent;
8167      var textLines = splitLinesAuto(inserted), multiPaste = null;
8168      // When pasting N lines into N selections, insert one line per selection
8169      if (paste && sel.ranges.length > 1) {
8170        if (lastCopied && lastCopied.text.join("\n") == inserted) {
8171          if (sel.ranges.length % lastCopied.text.length == 0) {
8172            multiPaste = [];
8173            for (var i = 0; i < lastCopied.text.length; i++)
8174              { multiPaste.push(doc.splitLines(lastCopied.text[i])); }
8175          }
8176        } else if (textLines.length == sel.ranges.length && cm.options.pasteLinesPerSelection) {
8177          multiPaste = map(textLines, function (l) { return [l]; });
8178        }
8179      }
8180  
8181      var updateInput = cm.curOp.updateInput;
8182      // Normal behavior is to insert the new text into every selection
8183      for (var i$1 = sel.ranges.length - 1; i$1 >= 0; i$1--) {
8184        var range = sel.ranges[i$1];
8185        var from = range.from(), to = range.to();
8186        if (range.empty()) {
8187          if (deleted && deleted > 0) // Handle deletion
8188            { from = Pos(from.line, from.ch - deleted); }
8189          else if (cm.state.overwrite && !paste) // Handle overwrite
8190            { to = Pos(to.line, Math.min(getLine(doc, to.line).text.length, to.ch + lst(textLines).length)); }
8191          else if (paste && lastCopied && lastCopied.lineWise && lastCopied.text.join("\n") == textLines.join("\n"))
8192            { from = to = Pos(from.line, 0); }
8193        }
8194        var changeEvent = {from: from, to: to, text: multiPaste ? multiPaste[i$1 % multiPaste.length] : textLines,
8195                           origin: origin || (paste ? "paste" : cm.state.cutIncoming > recent ? "cut" : "+input")};
8196        makeChange(cm.doc, changeEvent);
8197        signalLater(cm, "inputRead", cm, changeEvent);
8198      }
8199      if (inserted && !paste)
8200        { triggerElectric(cm, inserted); }
8201  
8202      ensureCursorVisible(cm);
8203      if (cm.curOp.updateInput < 2) { cm.curOp.updateInput = updateInput; }
8204      cm.curOp.typing = true;
8205      cm.state.pasteIncoming = cm.state.cutIncoming = -1;
8206    }
8207  
8208    function handlePaste(e, cm) {
8209      var pasted = e.clipboardData && e.clipboardData.getData("Text");
8210      if (pasted) {
8211        e.preventDefault();
8212        if (!cm.isReadOnly() && !cm.options.disableInput && cm.hasFocus())
8213          { runInOp(cm, function () { return applyTextInput(cm, pasted, 0, null, "paste"); }); }
8214        return true
8215      }
8216    }
8217  
8218    function triggerElectric(cm, inserted) {
8219      // When an 'electric' character is inserted, immediately trigger a reindent
8220      if (!cm.options.electricChars || !cm.options.smartIndent) { return }
8221      var sel = cm.doc.sel;
8222  
8223      for (var i = sel.ranges.length - 1; i >= 0; i--) {
8224        var range = sel.ranges[i];
8225        if (range.head.ch > 100 || (i && sel.ranges[i - 1].head.line == range.head.line)) { continue }
8226        var mode = cm.getModeAt(range.head);
8227        var indented = false;
8228        if (mode.electricChars) {
8229          for (var j = 0; j < mode.electricChars.length; j++)
8230            { if (inserted.indexOf(mode.electricChars.charAt(j)) > -1) {
8231              indented = indentLine(cm, range.head.line, "smart");
8232              break
8233            } }
8234        } else if (mode.electricInput) {
8235          if (mode.electricInput.test(getLine(cm.doc, range.head.line).text.slice(0, range.head.ch)))
8236            { indented = indentLine(cm, range.head.line, "smart"); }
8237        }
8238        if (indented) { signalLater(cm, "electricInput", cm, range.head.line); }
8239      }
8240    }
8241  
8242    function copyableRanges(cm) {
8243      var text = [], ranges = [];
8244      for (var i = 0; i < cm.doc.sel.ranges.length; i++) {
8245        var line = cm.doc.sel.ranges[i].head.line;
8246        var lineRange = {anchor: Pos(line, 0), head: Pos(line + 1, 0)};
8247        ranges.push(lineRange);
8248        text.push(cm.getRange(lineRange.anchor, lineRange.head));
8249      }
8250      return {text: text, ranges: ranges}
8251    }
8252  
8253    function disableBrowserMagic(field, spellcheck, autocorrect, autocapitalize) {
8254      field.setAttribute("autocorrect", autocorrect ? "" : "off");
8255      field.setAttribute("autocapitalize", autocapitalize ? "" : "off");
8256      field.setAttribute("spellcheck", !!spellcheck);
8257    }
8258  
8259    function hiddenTextarea() {
8260      var te = elt("textarea", null, null, "position: absolute; bottom: -1em; padding: 0; width: 1px; height: 1em; min-height: 1em; outline: none");
8261      var div = elt("div", [te], null, "overflow: hidden; position: relative; width: 3px; height: 0px;");
8262      // The textarea is kept positioned near the cursor to prevent the
8263      // fact that it'll be scrolled into view on input from scrolling
8264      // our fake cursor out of view. On webkit, when wrap=off, paste is
8265      // very slow. So make the area wide instead.
8266      if (webkit) { te.style.width = "1000px"; }
8267      else { te.setAttribute("wrap", "off"); }
8268      // If border: 0; -- iOS fails to open keyboard (issue #1287)
8269      if (ios) { te.style.border = "1px solid black"; }
8270      disableBrowserMagic(te);
8271      return div
8272    }
8273  
8274    // The publicly visible API. Note that methodOp(f) means
8275    // 'wrap f in an operation, performed on its `this` parameter'.
8276  
8277    // This is not the complete set of editor methods. Most of the
8278    // methods defined on the Doc type are also injected into
8279    // CodeMirror.prototype, for backwards compatibility and
8280    // convenience.
8281  
8282    function addEditorMethods(CodeMirror) {
8283      var optionHandlers = CodeMirror.optionHandlers;
8284  
8285      var helpers = CodeMirror.helpers = {};
8286  
8287      CodeMirror.prototype = {
8288        constructor: CodeMirror,
8289        focus: function(){window.focus(); this.display.input.focus();},
8290  
8291        setOption: function(option, value) {
8292          var options = this.options, old = options[option];
8293          if (options[option] == value && option != "mode") { return }
8294          options[option] = value;
8295          if (optionHandlers.hasOwnProperty(option))
8296            { operation(this, optionHandlers[option])(this, value, old); }
8297          signal(this, "optionChange", this, option);
8298        },
8299  
8300        getOption: function(option) {return this.options[option]},
8301        getDoc: function() {return this.doc},
8302  
8303        addKeyMap: function(map, bottom) {
8304          this.state.keyMaps[bottom ? "push" : "unshift"](getKeyMap(map));
8305        },
8306        removeKeyMap: function(map) {
8307          var maps = this.state.keyMaps;
8308          for (var i = 0; i < maps.length; ++i)
8309            { if (maps[i] == map || maps[i].name == map) {
8310              maps.splice(i, 1);
8311              return true
8312            } }
8313        },
8314  
8315        addOverlay: methodOp(function(spec, options) {
8316          var mode = spec.token ? spec : CodeMirror.getMode(this.options, spec);
8317          if (mode.startState) { throw new Error("Overlays may not be stateful.") }
8318          insertSorted(this.state.overlays,
8319                       {mode: mode, modeSpec: spec, opaque: options && options.opaque,
8320                        priority: (options && options.priority) || 0},
8321                       function (overlay) { return overlay.priority; });
8322          this.state.modeGen++;
8323          regChange(this);
8324        }),
8325        removeOverlay: methodOp(function(spec) {
8326          var overlays = this.state.overlays;
8327          for (var i = 0; i < overlays.length; ++i) {
8328            var cur = overlays[i].modeSpec;
8329            if (cur == spec || typeof spec == "string" && cur.name == spec) {
8330              overlays.splice(i, 1);
8331              this.state.modeGen++;
8332              regChange(this);
8333              return
8334            }
8335          }
8336        }),
8337  
8338        indentLine: methodOp(function(n, dir, aggressive) {
8339          if (typeof dir != "string" && typeof dir != "number") {
8340            if (dir == null) { dir = this.options.smartIndent ? "smart" : "prev"; }
8341            else { dir = dir ? "add" : "subtract"; }
8342          }
8343          if (isLine(this.doc, n)) { indentLine(this, n, dir, aggressive); }
8344        }),
8345        indentSelection: methodOp(function(how) {
8346          var ranges = this.doc.sel.ranges, end = -1;
8347          for (var i = 0; i < ranges.length; i++) {
8348            var range = ranges[i];
8349            if (!range.empty()) {
8350              var from = range.from(), to = range.to();
8351              var start = Math.max(end, from.line);
8352              end = Math.min(this.lastLine(), to.line - (to.ch ? 0 : 1)) + 1;
8353              for (var j = start; j < end; ++j)
8354                { indentLine(this, j, how); }
8355              var newRanges = this.doc.sel.ranges;
8356              if (from.ch == 0 && ranges.length == newRanges.length && newRanges[i].from().ch > 0)
8357                { replaceOneSelection(this.doc, i, new Range(from, newRanges[i].to()), sel_dontScroll); }
8358            } else if (range.head.line > end) {
8359              indentLine(this, range.head.line, how, true);
8360              end = range.head.line;
8361              if (i == this.doc.sel.primIndex) { ensureCursorVisible(this); }
8362            }
8363          }
8364        }),
8365  
8366        // Fetch the parser token for a given character. Useful for hacks
8367        // that want to inspect the mode state (say, for completion).
8368        getTokenAt: function(pos, precise) {
8369          return takeToken(this, pos, precise)
8370        },
8371  
8372        getLineTokens: function(line, precise) {
8373          return takeToken(this, Pos(line), precise, true)
8374        },
8375  
8376        getTokenTypeAt: function(pos) {
8377          pos = clipPos(this.doc, pos);
8378          var styles = getLineStyles(this, getLine(this.doc, pos.line));
8379          var before = 0, after = (styles.length - 1) / 2, ch = pos.ch;
8380          var type;
8381          if (ch == 0) { type = styles[2]; }
8382          else { for (;;) {
8383            var mid = (before + after) >> 1;
8384            if ((mid ? styles[mid * 2 - 1] : 0) >= ch) { after = mid; }
8385            else if (styles[mid * 2 + 1] < ch) { before = mid + 1; }
8386            else { type = styles[mid * 2 + 2]; break }
8387          } }
8388          var cut = type ? type.indexOf("overlay ") : -1;
8389          return cut < 0 ? type : cut == 0 ? null : type.slice(0, cut - 1)
8390        },
8391  
8392        getModeAt: function(pos) {
8393          var mode = this.doc.mode;
8394          if (!mode.innerMode) { return mode }
8395          return CodeMirror.innerMode(mode, this.getTokenAt(pos).state).mode
8396        },
8397  
8398        getHelper: function(pos, type) {
8399          return this.getHelpers(pos, type)[0]
8400        },
8401  
8402        getHelpers: function(pos, type) {
8403          var found = [];
8404          if (!helpers.hasOwnProperty(type)) { return found }
8405          var help = helpers[type], mode = this.getModeAt(pos);
8406          if (typeof mode[type] == "string") {
8407            if (help[mode[type]]) { found.push(help[mode[type]]); }
8408          } else if (mode[type]) {
8409            for (var i = 0; i < mode[type].length; i++) {
8410              var val = help[mode[type][i]];
8411              if (val) { found.push(val); }
8412            }
8413          } else if (mode.helperType && help[mode.helperType]) {
8414            found.push(help[mode.helperType]);
8415          } else if (help[mode.name]) {
8416            found.push(help[mode.name]);
8417          }
8418          for (var i$1 = 0; i$1 < help._global.length; i$1++) {
8419            var cur = help._global[i$1];
8420            if (cur.pred(mode, this) && indexOf(found, cur.val) == -1)
8421              { found.push(cur.val); }
8422          }
8423          return found
8424        },
8425  
8426        getStateAfter: function(line, precise) {
8427          var doc = this.doc;
8428          line = clipLine(doc, line == null ? doc.first + doc.size - 1: line);
8429          return getContextBefore(this, line + 1, precise).state
8430        },
8431  
8432        cursorCoords: function(start, mode) {
8433          var pos, range = this.doc.sel.primary();
8434          if (start == null) { pos = range.head; }
8435          else if (typeof start == "object") { pos = clipPos(this.doc, start); }
8436          else { pos = start ? range.from() : range.to(); }
8437          return cursorCoords(this, pos, mode || "page")
8438        },
8439  
8440        charCoords: function(pos, mode) {
8441          return charCoords(this, clipPos(this.doc, pos), mode || "page")
8442        },
8443  
8444        coordsChar: function(coords, mode) {
8445          coords = fromCoordSystem(this, coords, mode || "page");
8446          return coordsChar(this, coords.left, coords.top)
8447        },
8448  
8449        lineAtHeight: function(height, mode) {
8450          height = fromCoordSystem(this, {top: height, left: 0}, mode || "page").top;
8451          return lineAtHeight(this.doc, height + this.display.viewOffset)
8452        },
8453        heightAtLine: function(line, mode, includeWidgets) {
8454          var end = false, lineObj;
8455          if (typeof line == "number") {
8456            var last = this.doc.first + this.doc.size - 1;
8457            if (line < this.doc.first) { line = this.doc.first; }
8458            else if (line > last) { line = last; end = true; }
8459            lineObj = getLine(this.doc, line);
8460          } else {
8461            lineObj = line;
8462          }
8463          return intoCoordSystem(this, lineObj, {top: 0, left: 0}, mode || "page", includeWidgets || end).top +
8464            (end ? this.doc.height - heightAtLine(lineObj) : 0)
8465        },
8466  
8467        defaultTextHeight: function() { return textHeight(this.display) },
8468        defaultCharWidth: function() { return charWidth(this.display) },
8469  
8470        getViewport: function() { return {from: this.display.viewFrom, to: this.display.viewTo}},
8471  
8472        addWidget: function(pos, node, scroll, vert, horiz) {
8473          var display = this.display;
8474          pos = cursorCoords(this, clipPos(this.doc, pos));
8475          var top = pos.bottom, left = pos.left;
8476          node.style.position = "absolute";
8477          node.setAttribute("cm-ignore-events", "true");
8478          this.display.input.setUneditable(node);
8479          display.sizer.appendChild(node);
8480          if (vert == "over") {
8481            top = pos.top;
8482          } else if (vert == "above" || vert == "near") {
8483            var vspace = Math.max(display.wrapper.clientHeight, this.doc.height),
8484            hspace = Math.max(display.sizer.clientWidth, display.lineSpace.clientWidth);
8485            // Default to positioning above (if specified and possible); otherwise default to positioning below
8486            if ((vert == 'above' || pos.bottom + node.offsetHeight > vspace) && pos.top > node.offsetHeight)
8487              { top = pos.top - node.offsetHeight; }
8488            else if (pos.bottom + node.offsetHeight <= vspace)
8489              { top = pos.bottom; }
8490            if (left + node.offsetWidth > hspace)
8491              { left = hspace - node.offsetWidth; }
8492          }
8493          node.style.top = top + "px";
8494          node.style.left = node.style.right = "";
8495          if (horiz == "right") {
8496            left = display.sizer.clientWidth - node.offsetWidth;
8497            node.style.right = "0px";
8498          } else {
8499            if (horiz == "left") { left = 0; }
8500            else if (horiz == "middle") { left = (display.sizer.clientWidth - node.offsetWidth) / 2; }
8501            node.style.left = left + "px";
8502          }
8503          if (scroll)
8504            { scrollIntoView(this, {left: left, top: top, right: left + node.offsetWidth, bottom: top + node.offsetHeight}); }
8505        },
8506  
8507        triggerOnKeyDown: methodOp(onKeyDown),
8508        triggerOnKeyPress: methodOp(onKeyPress),
8509        triggerOnKeyUp: onKeyUp,
8510        triggerOnMouseDown: methodOp(onMouseDown),
8511  
8512        execCommand: function(cmd) {
8513          if (commands.hasOwnProperty(cmd))
8514            { return commands[cmd].call(null, this) }
8515        },
8516  
8517        triggerElectric: methodOp(function(text) { triggerElectric(this, text); }),
8518  
8519        findPosH: function(from, amount, unit, visually) {
8520          var dir = 1;
8521          if (amount < 0) { dir = -1; amount = -amount; }
8522          var cur = clipPos(this.doc, from);
8523          for (var i = 0; i < amount; ++i) {
8524            cur = findPosH(this.doc, cur, dir, unit, visually);
8525            if (cur.hitSide) { break }
8526          }
8527          return cur
8528        },
8529  
8530        moveH: methodOp(function(dir, unit) {
8531          var this$1 = this;
8532  
8533          this.extendSelectionsBy(function (range) {
8534            if (this$1.display.shift || this$1.doc.extend || range.empty())
8535              { return findPosH(this$1.doc, range.head, dir, unit, this$1.options.rtlMoveVisually) }
8536            else
8537              { return dir < 0 ? range.from() : range.to() }
8538          }, sel_move);
8539        }),
8540  
8541        deleteH: methodOp(function(dir, unit) {
8542          var sel = this.doc.sel, doc = this.doc;
8543          if (sel.somethingSelected())
8544            { doc.replaceSelection("", null, "+delete"); }
8545          else
8546            { deleteNearSelection(this, function (range) {
8547              var other = findPosH(doc, range.head, dir, unit, false);
8548              return dir < 0 ? {from: other, to: range.head} : {from: range.head, to: other}
8549            }); }
8550        }),
8551  
8552        findPosV: function(from, amount, unit, goalColumn) {
8553          var dir = 1, x = goalColumn;
8554          if (amount < 0) { dir = -1; amount = -amount; }
8555          var cur = clipPos(this.doc, from);
8556          for (var i = 0; i < amount; ++i) {
8557            var coords = cursorCoords(this, cur, "div");
8558            if (x == null) { x = coords.left; }
8559            else { coords.left = x; }
8560            cur = findPosV(this, coords, dir, unit);
8561            if (cur.hitSide) { break }
8562          }
8563          return cur
8564        },
8565  
8566        moveV: methodOp(function(dir, unit) {
8567          var this$1 = this;
8568  
8569          var doc = this.doc, goals = [];
8570          var collapse = !this.display.shift && !doc.extend && doc.sel.somethingSelected();
8571          doc.extendSelectionsBy(function (range) {
8572            if (collapse)
8573              { return dir < 0 ? range.from() : range.to() }
8574            var headPos = cursorCoords(this$1, range.head, "div");
8575            if (range.goalColumn != null) { headPos.left = range.goalColumn; }
8576            goals.push(headPos.left);
8577            var pos = findPosV(this$1, headPos, dir, unit);
8578            if (unit == "page" && range == doc.sel.primary())
8579              { addToScrollTop(this$1, charCoords(this$1, pos, "div").top - headPos.top); }
8580            return pos
8581          }, sel_move);
8582          if (goals.length) { for (var i = 0; i < doc.sel.ranges.length; i++)
8583            { doc.sel.ranges[i].goalColumn = goals[i]; } }
8584        }),
8585  
8586        // Find the word at the given position (as returned by coordsChar).
8587        findWordAt: function(pos) {
8588          var doc = this.doc, line = getLine(doc, pos.line).text;
8589          var start = pos.ch, end = pos.ch;
8590          if (line) {
8591            var helper = this.getHelper(pos, "wordChars");
8592            if ((pos.sticky == "before" || end == line.length) && start) { --start; } else { ++end; }
8593            var startChar = line.charAt(start);
8594            var check = isWordChar(startChar, helper)
8595              ? function (ch) { return isWordChar(ch, helper); }
8596              : /\s/.test(startChar) ? function (ch) { return /\s/.test(ch); }
8597              : function (ch) { return (!/\s/.test(ch) && !isWordChar(ch)); };
8598            while (start > 0 && check(line.charAt(start - 1))) { --start; }
8599            while (end < line.length && check(line.charAt(end))) { ++end; }
8600          }
8601          return new Range(Pos(pos.line, start), Pos(pos.line, end))
8602        },
8603  
8604        toggleOverwrite: function(value) {
8605          if (value != null && value == this.state.overwrite) { return }
8606          if (this.state.overwrite = !this.state.overwrite)
8607            { addClass(this.display.cursorDiv, "CodeMirror-overwrite"); }
8608          else
8609            { rmClass(this.display.cursorDiv, "CodeMirror-overwrite"); }
8610  
8611          signal(this, "overwriteToggle", this, this.state.overwrite);
8612        },
8613        hasFocus: function() { return this.display.input.getField() == activeElt() },
8614        isReadOnly: function() { return !!(this.options.readOnly || this.doc.cantEdit) },
8615  
8616        scrollTo: methodOp(function (x, y) { scrollToCoords(this, x, y); }),
8617        getScrollInfo: function() {
8618          var scroller = this.display.scroller;
8619          return {left: scroller.scrollLeft, top: scroller.scrollTop,
8620                  height: scroller.scrollHeight - scrollGap(this) - this.display.barHeight,
8621                  width: scroller.scrollWidth - scrollGap(this) - this.display.barWidth,
8622                  clientHeight: displayHeight(this), clientWidth: displayWidth(this)}
8623        },
8624  
8625        scrollIntoView: methodOp(function(range, margin) {
8626          if (range == null) {
8627            range = {from: this.doc.sel.primary().head, to: null};
8628            if (margin == null) { margin = this.options.cursorScrollMargin; }
8629          } else if (typeof range == "number") {
8630            range = {from: Pos(range, 0), to: null};
8631          } else if (range.from == null) {
8632            range = {from: range, to: null};
8633          }
8634          if (!range.to) { range.to = range.from; }
8635          range.margin = margin || 0;
8636  
8637          if (range.from.line != null) {
8638            scrollToRange(this, range);
8639          } else {
8640            scrollToCoordsRange(this, range.from, range.to, range.margin);
8641          }
8642        }),
8643  
8644        setSize: methodOp(function(width, height) {
8645          var this$1 = this;
8646  
8647          var interpret = function (val) { return typeof val == "number" || /^\d+$/.test(String(val)) ? val + "px" : val; };
8648          if (width != null) { this.display.wrapper.style.width = interpret(width); }
8649          if (height != null) { this.display.wrapper.style.height = interpret(height); }
8650          if (this.options.lineWrapping) { clearLineMeasurementCache(this); }
8651          var lineNo = this.display.viewFrom;
8652          this.doc.iter(lineNo, this.display.viewTo, function (line) {
8653            if (line.widgets) { for (var i = 0; i < line.widgets.length; i++)
8654              { if (line.widgets[i].noHScroll) { regLineChange(this$1, lineNo, "widget"); break } } }
8655            ++lineNo;
8656          });
8657          this.curOp.forceUpdate = true;
8658          signal(this, "refresh", this);
8659        }),
8660  
8661        operation: function(f){return runInOp(this, f)},
8662        startOperation: function(){return startOperation(this)},
8663        endOperation: function(){return endOperation(this)},
8664  
8665        refresh: methodOp(function() {
8666          var oldHeight = this.display.cachedTextHeight;
8667          regChange(this);
8668          this.curOp.forceUpdate = true;
8669          clearCaches(this);
8670          scrollToCoords(this, this.doc.scrollLeft, this.doc.scrollTop);
8671          updateGutterSpace(this.display);
8672          if (oldHeight == null || Math.abs(oldHeight - textHeight(this.display)) > .5 || this.options.lineWrapping)
8673            { estimateLineHeights(this); }
8674          signal(this, "refresh", this);
8675        }),
8676  
8677        swapDoc: methodOp(function(doc) {
8678          var old = this.doc;
8679          old.cm = null;
8680          // Cancel the current text selection if any (#5821)
8681          if (this.state.selectingText) { this.state.selectingText(); }
8682          attachDoc(this, doc);
8683          clearCaches(this);
8684          this.display.input.reset();
8685          scrollToCoords(this, doc.scrollLeft, doc.scrollTop);
8686          this.curOp.forceScroll = true;
8687          signalLater(this, "swapDoc", this, old);
8688          return old
8689        }),
8690  
8691        phrase: function(phraseText) {
8692          var phrases = this.options.phrases;
8693          return phrases && Object.prototype.hasOwnProperty.call(phrases, phraseText) ? phrases[phraseText] : phraseText
8694        },
8695  
8696        getInputField: function(){return this.display.input.getField()},
8697        getWrapperElement: function(){return this.display.wrapper},
8698        getScrollerElement: function(){return this.display.scroller},
8699        getGutterElement: function(){return this.display.gutters}
8700      };
8701      eventMixin(CodeMirror);
8702  
8703      CodeMirror.registerHelper = function(type, name, value) {
8704        if (!helpers.hasOwnProperty(type)) { helpers[type] = CodeMirror[type] = {_global: []}; }
8705        helpers[type][name] = value;
8706      };
8707      CodeMirror.registerGlobalHelper = function(type, name, predicate, value) {
8708        CodeMirror.registerHelper(type, name, value);
8709        helpers[type]._global.push({pred: predicate, val: value});
8710      };
8711    }
8712  
8713    // Used for horizontal relative motion. Dir is -1 or 1 (left or
8714    // right), unit can be "codepoint", "char", "column" (like char, but
8715    // doesn't cross line boundaries), "word" (across next word), or
8716    // "group" (to the start of next group of word or
8717    // non-word-non-whitespace chars). The visually param controls
8718    // whether, in right-to-left text, direction 1 means to move towards
8719    // the next index in the string, or towards the character to the right
8720    // of the current position. The resulting position will have a
8721    // hitSide=true property if it reached the end of the document.
8722    function findPosH(doc, pos, dir, unit, visually) {
8723      var oldPos = pos;
8724      var origDir = dir;
8725      var lineObj = getLine(doc, pos.line);
8726      var lineDir = visually && doc.direction == "rtl" ? -dir : dir;
8727      function findNextLine() {
8728        var l = pos.line + lineDir;
8729        if (l < doc.first || l >= doc.first + doc.size) { return false }
8730        pos = new Pos(l, pos.ch, pos.sticky);
8731        return lineObj = getLine(doc, l)
8732      }
8733      function moveOnce(boundToLine) {
8734        var next;
8735        if (unit == "codepoint") {
8736          var ch = lineObj.text.charCodeAt(pos.ch + (dir > 0 ? 0 : -1));
8737          if (isNaN(ch)) {
8738            next = null;
8739          } else {
8740            var astral = dir > 0 ? ch >= 0xD800 && ch < 0xDC00 : ch >= 0xDC00 && ch < 0xDFFF;
8741            next = new Pos(pos.line, Math.max(0, Math.min(lineObj.text.length, pos.ch + dir * (astral ? 2 : 1))), -dir);
8742          }
8743        } else if (visually) {
8744          next = moveVisually(doc.cm, lineObj, pos, dir);
8745        } else {
8746          next = moveLogically(lineObj, pos, dir);
8747        }
8748        if (next == null) {
8749          if (!boundToLine && findNextLine())
8750            { pos = endOfLine(visually, doc.cm, lineObj, pos.line, lineDir); }
8751          else
8752            { return false }
8753        } else {
8754          pos = next;
8755        }
8756        return true
8757      }
8758  
8759      if (unit == "char" || unit == "codepoint") {
8760        moveOnce();
8761      } else if (unit == "column") {
8762        moveOnce(true);
8763      } else if (unit == "word" || unit == "group") {
8764        var sawType = null, group = unit == "group";
8765        var helper = doc.cm && doc.cm.getHelper(pos, "wordChars");
8766        for (var first = true;; first = false) {
8767          if (dir < 0 && !moveOnce(!first)) { break }
8768          var cur = lineObj.text.charAt(pos.ch) || "\n";
8769          var type = isWordChar(cur, helper) ? "w"
8770            : group && cur == "\n" ? "n"
8771            : !group || /\s/.test(cur) ? null
8772            : "p";
8773          if (group && !first && !type) { type = "s"; }
8774          if (sawType && sawType != type) {
8775            if (dir < 0) {dir = 1; moveOnce(); pos.sticky = "after";}
8776            break
8777          }
8778  
8779          if (type) { sawType = type; }
8780          if (dir > 0 && !moveOnce(!first)) { break }
8781        }
8782      }
8783      var result = skipAtomic(doc, pos, oldPos, origDir, true);
8784      if (equalCursorPos(oldPos, result)) { result.hitSide = true; }
8785      return result
8786    }
8787  
8788    // For relative vertical movement. Dir may be -1 or 1. Unit can be
8789    // "page" or "line". The resulting position will have a hitSide=true
8790    // property if it reached the end of the document.
8791    function findPosV(cm, pos, dir, unit) {
8792      var doc = cm.doc, x = pos.left, y;
8793      if (unit == "page") {
8794        var pageSize = Math.min(cm.display.wrapper.clientHeight, window.innerHeight || document.documentElement.clientHeight);
8795        var moveAmount = Math.max(pageSize - .5 * textHeight(cm.display), 3);
8796        y = (dir > 0 ? pos.bottom : pos.top) + dir * moveAmount;
8797  
8798      } else if (unit == "line") {
8799        y = dir > 0 ? pos.bottom + 3 : pos.top - 3;
8800      }
8801      var target;
8802      for (;;) {
8803        target = coordsChar(cm, x, y);
8804        if (!target.outside) { break }
8805        if (dir < 0 ? y <= 0 : y >= doc.height) { target.hitSide = true; break }
8806        y += dir * 5;
8807      }
8808      return target
8809    }
8810  
8811    // CONTENTEDITABLE INPUT STYLE
8812  
8813    var ContentEditableInput = function(cm) {
8814      this.cm = cm;
8815      this.lastAnchorNode = this.lastAnchorOffset = this.lastFocusNode = this.lastFocusOffset = null;
8816      this.polling = new Delayed();
8817      this.composing = null;
8818      this.gracePeriod = false;
8819      this.readDOMTimeout = null;
8820    };
8821  
8822    ContentEditableInput.prototype.init = function (display) {
8823        var this$1 = this;
8824  
8825      var input = this, cm = input.cm;
8826      var div = input.div = display.lineDiv;
8827      div.contentEditable = true;
8828      disableBrowserMagic(div, cm.options.spellcheck, cm.options.autocorrect, cm.options.autocapitalize);
8829  
8830      function belongsToInput(e) {
8831        for (var t = e.target; t; t = t.parentNode) {
8832          if (t == div) { return true }
8833          if (/\bCodeMirror-(?:line)?widget\b/.test(t.className)) { break }
8834        }
8835        return false
8836      }
8837  
8838      on(div, "paste", function (e) {
8839        if (!belongsToInput(e) || signalDOMEvent(cm, e) || handlePaste(e, cm)) { return }
8840        // IE doesn't fire input events, so we schedule a read for the pasted content in this way
8841        if (ie_version <= 11) { setTimeout(operation(cm, function () { return this$1.updateFromDOM(); }), 20); }
8842      });
8843  
8844      on(div, "compositionstart", function (e) {
8845        this$1.composing = {data: e.data, done: false};
8846      });
8847      on(div, "compositionupdate", function (e) {
8848        if (!this$1.composing) { this$1.composing = {data: e.data, done: false}; }
8849      });
8850      on(div, "compositionend", function (e) {
8851        if (this$1.composing) {
8852          if (e.data != this$1.composing.data) { this$1.readFromDOMSoon(); }
8853          this$1.composing.done = true;
8854        }
8855      });
8856  
8857      on(div, "touchstart", function () { return input.forceCompositionEnd(); });
8858  
8859      on(div, "input", function () {
8860        if (!this$1.composing) { this$1.readFromDOMSoon(); }
8861      });
8862  
8863      function onCopyCut(e) {
8864        if (!belongsToInput(e) || signalDOMEvent(cm, e)) { return }
8865        if (cm.somethingSelected()) {
8866          setLastCopied({lineWise: false, text: cm.getSelections()});
8867          if (e.type == "cut") { cm.replaceSelection("", null, "cut"); }
8868        } else if (!cm.options.lineWiseCopyCut) {
8869          return
8870        } else {
8871          var ranges = copyableRanges(cm);
8872          setLastCopied({lineWise: true, text: ranges.text});
8873          if (e.type == "cut") {
8874            cm.operation(function () {
8875              cm.setSelections(ranges.ranges, 0, sel_dontScroll);
8876              cm.replaceSelection("", null, "cut");
8877            });
8878          }
8879        }
8880        if (e.clipboardData) {
8881          e.clipboardData.clearData();
8882          var content = lastCopied.text.join("\n");
8883          // iOS exposes the clipboard API, but seems to discard content inserted into it
8884          e.clipboardData.setData("Text", content);
8885          if (e.clipboardData.getData("Text") == content) {
8886            e.preventDefault();
8887            return
8888          }
8889        }
8890        // Old-fashioned briefly-focus-a-textarea hack
8891        var kludge = hiddenTextarea(), te = kludge.firstChild;
8892        cm.display.lineSpace.insertBefore(kludge, cm.display.lineSpace.firstChild);
8893        te.value = lastCopied.text.join("\n");
8894        var hadFocus = activeElt();
8895        selectInput(te);
8896        setTimeout(function () {
8897          cm.display.lineSpace.removeChild(kludge);
8898          hadFocus.focus();
8899          if (hadFocus == div) { input.showPrimarySelection(); }
8900        }, 50);
8901      }
8902      on(div, "copy", onCopyCut);
8903      on(div, "cut", onCopyCut);
8904    };
8905  
8906    ContentEditableInput.prototype.screenReaderLabelChanged = function (label) {
8907      // Label for screenreaders, accessibility
8908      if(label) {
8909        this.div.setAttribute('aria-label', label);
8910      } else {
8911        this.div.removeAttribute('aria-label');
8912      }
8913    };
8914  
8915    ContentEditableInput.prototype.prepareSelection = function () {
8916      var result = prepareSelection(this.cm, false);
8917      result.focus = activeElt() == this.div;
8918      return result
8919    };
8920  
8921    ContentEditableInput.prototype.showSelection = function (info, takeFocus) {
8922      if (!info || !this.cm.display.view.length) { return }
8923      if (info.focus || takeFocus) { this.showPrimarySelection(); }
8924      this.showMultipleSelections(info);
8925    };
8926  
8927    ContentEditableInput.prototype.getSelection = function () {
8928      return this.cm.display.wrapper.ownerDocument.getSelection()
8929    };
8930  
8931    ContentEditableInput.prototype.showPrimarySelection = function () {
8932      var sel = this.getSelection(), cm = this.cm, prim = cm.doc.sel.primary();
8933      var from = prim.from(), to = prim.to();
8934  
8935      if (cm.display.viewTo == cm.display.viewFrom || from.line >= cm.display.viewTo || to.line < cm.display.viewFrom) {
8936        sel.removeAllRanges();
8937        return
8938      }
8939  
8940      var curAnchor = domToPos(cm, sel.anchorNode, sel.anchorOffset);
8941      var curFocus = domToPos(cm, sel.focusNode, sel.focusOffset);
8942      if (curAnchor && !curAnchor.bad && curFocus && !curFocus.bad &&
8943          cmp(minPos(curAnchor, curFocus), from) == 0 &&
8944          cmp(maxPos(curAnchor, curFocus), to) == 0)
8945        { return }
8946  
8947      var view = cm.display.view;
8948      var start = (from.line >= cm.display.viewFrom && posToDOM(cm, from)) ||
8949          {node: view[0].measure.map[2], offset: 0};
8950      var end = to.line < cm.display.viewTo && posToDOM(cm, to);
8951      if (!end) {
8952        var measure = view[view.length - 1].measure;
8953        var map = measure.maps ? measure.maps[measure.maps.length - 1] : measure.map;
8954        end = {node: map[map.length - 1], offset: map[map.length - 2] - map[map.length - 3]};
8955      }
8956  
8957      if (!start || !end) {
8958        sel.removeAllRanges();
8959        return
8960      }
8961  
8962      var old = sel.rangeCount && sel.getRangeAt(0), rng;
8963      try { rng = range(start.node, start.offset, end.offset, end.node); }
8964      catch(e) {} // Our model of the DOM might be outdated, in which case the range we try to set can be impossible
8965      if (rng) {
8966        if (!gecko && cm.state.focused) {
8967          sel.collapse(start.node, start.offset);
8968          if (!rng.collapsed) {
8969            sel.removeAllRanges();
8970            sel.addRange(rng);
8971          }
8972        } else {
8973          sel.removeAllRanges();
8974          sel.addRange(rng);
8975        }
8976        if (old && sel.anchorNode == null) { sel.addRange(old); }
8977        else if (gecko) { this.startGracePeriod(); }
8978      }
8979      this.rememberSelection();
8980    };
8981  
8982    ContentEditableInput.prototype.startGracePeriod = function () {
8983        var this$1 = this;
8984  
8985      clearTimeout(this.gracePeriod);
8986      this.gracePeriod = setTimeout(function () {
8987        this$1.gracePeriod = false;
8988        if (this$1.selectionChanged())
8989          { this$1.cm.operation(function () { return this$1.cm.curOp.selectionChanged = true; }); }
8990      }, 20);
8991    };
8992  
8993    ContentEditableInput.prototype.showMultipleSelections = function (info) {
8994      removeChildrenAndAdd(this.cm.display.cursorDiv, info.cursors);
8995      removeChildrenAndAdd(this.cm.display.selectionDiv, info.selection);
8996    };
8997  
8998    ContentEditableInput.prototype.rememberSelection = function () {
8999      var sel = this.getSelection();
9000      this.lastAnchorNode = sel.anchorNode; this.lastAnchorOffset = sel.anchorOffset;
9001      this.lastFocusNode = sel.focusNode; this.lastFocusOffset = sel.focusOffset;
9002    };
9003  
9004    ContentEditableInput.prototype.selectionInEditor = function () {
9005      var sel = this.getSelection();
9006      if (!sel.rangeCount) { return false }
9007      var node = sel.getRangeAt(0).commonAncestorContainer;
9008      return contains(this.div, node)
9009    };
9010  
9011    ContentEditableInput.prototype.focus = function () {
9012      if (this.cm.options.readOnly != "nocursor") {
9013        if (!this.selectionInEditor() || activeElt() != this.div)
9014          { this.showSelection(this.prepareSelection(), true); }
9015        this.div.focus();
9016      }
9017    };
9018    ContentEditableInput.prototype.blur = function () { this.div.blur(); };
9019    ContentEditableInput.prototype.getField = function () { return this.div };
9020  
9021    ContentEditableInput.prototype.supportsTouch = function () { return true };
9022  
9023    ContentEditableInput.prototype.receivedFocus = function () {
9024        var this$1 = this;
9025  
9026      var input = this;
9027      if (this.selectionInEditor())
9028        { setTimeout(function () { return this$1.pollSelection(); }, 20); }
9029      else
9030        { runInOp(this.cm, function () { return input.cm.curOp.selectionChanged = true; }); }
9031  
9032      function poll() {
9033        if (input.cm.state.focused) {
9034          input.pollSelection();
9035          input.polling.set(input.cm.options.pollInterval, poll);
9036        }
9037      }
9038      this.polling.set(this.cm.options.pollInterval, poll);
9039    };
9040  
9041    ContentEditableInput.prototype.selectionChanged = function () {
9042      var sel = this.getSelection();
9043      return sel.anchorNode != this.lastAnchorNode || sel.anchorOffset != this.lastAnchorOffset ||
9044        sel.focusNode != this.lastFocusNode || sel.focusOffset != this.lastFocusOffset
9045    };
9046  
9047    ContentEditableInput.prototype.pollSelection = function () {
9048      if (this.readDOMTimeout != null || this.gracePeriod || !this.selectionChanged()) { return }
9049      var sel = this.getSelection(), cm = this.cm;
9050      // On Android Chrome (version 56, at least), backspacing into an
9051      // uneditable block element will put the cursor in that element,
9052      // and then, because it's not editable, hide the virtual keyboard.
9053      // Because Android doesn't allow us to actually detect backspace
9054      // presses in a sane way, this code checks for when that happens
9055      // and simulates a backspace press in this case.
9056      if (android && chrome && this.cm.display.gutterSpecs.length && isInGutter(sel.anchorNode)) {
9057        this.cm.triggerOnKeyDown({type: "keydown", keyCode: 8, preventDefault: Math.abs});
9058        this.blur();
9059        this.focus();
9060        return
9061      }
9062      if (this.composing) { return }
9063      this.rememberSelection();
9064      var anchor = domToPos(cm, sel.anchorNode, sel.anchorOffset);
9065      var head = domToPos(cm, sel.focusNode, sel.focusOffset);
9066      if (anchor && head) { runInOp(cm, function () {
9067        setSelection(cm.doc, simpleSelection(anchor, head), sel_dontScroll);
9068        if (anchor.bad || head.bad) { cm.curOp.selectionChanged = true; }
9069      }); }
9070    };
9071  
9072    ContentEditableInput.prototype.pollContent = function () {
9073      if (this.readDOMTimeout != null) {
9074        clearTimeout(this.readDOMTimeout);
9075        this.readDOMTimeout = null;
9076      }
9077  
9078      var cm = this.cm, display = cm.display, sel = cm.doc.sel.primary();
9079      var from = sel.from(), to = sel.to();
9080      if (from.ch == 0 && from.line > cm.firstLine())
9081        { from = Pos(from.line - 1, getLine(cm.doc, from.line - 1).length); }
9082      if (to.ch == getLine(cm.doc, to.line).text.length && to.line < cm.lastLine())
9083        { to = Pos(to.line + 1, 0); }
9084      if (from.line < display.viewFrom || to.line > display.viewTo - 1) { return false }
9085  
9086      var fromIndex, fromLine, fromNode;
9087      if (from.line == display.viewFrom || (fromIndex = findViewIndex(cm, from.line)) == 0) {
9088        fromLine = lineNo(display.view[0].line);
9089        fromNode = display.view[0].node;
9090      } else {
9091        fromLine = lineNo(display.view[fromIndex].line);
9092        fromNode = display.view[fromIndex - 1].node.nextSibling;
9093      }
9094      var toIndex = findViewIndex(cm, to.line);
9095      var toLine, toNode;
9096      if (toIndex == display.view.length - 1) {
9097        toLine = display.viewTo - 1;
9098        toNode = display.lineDiv.lastChild;
9099      } else {
9100        toLine = lineNo(display.view[toIndex + 1].line) - 1;
9101        toNode = display.view[toIndex + 1].node.previousSibling;
9102      }
9103  
9104      if (!fromNode) { return false }
9105      var newText = cm.doc.splitLines(domTextBetween(cm, fromNode, toNode, fromLine, toLine));
9106      var oldText = getBetween(cm.doc, Pos(fromLine, 0), Pos(toLine, getLine(cm.doc, toLine).text.length));
9107      while (newText.length > 1 && oldText.length > 1) {
9108        if (lst(newText) == lst(oldText)) { newText.pop(); oldText.pop(); toLine--; }
9109        else if (newText[0] == oldText[0]) { newText.shift(); oldText.shift(); fromLine++; }
9110        else { break }
9111      }
9112  
9113      var cutFront = 0, cutEnd = 0;
9114      var newTop = newText[0], oldTop = oldText[0], maxCutFront = Math.min(newTop.length, oldTop.length);
9115      while (cutFront < maxCutFront && newTop.charCodeAt(cutFront) == oldTop.charCodeAt(cutFront))
9116        { ++cutFront; }
9117      var newBot = lst(newText), oldBot = lst(oldText);
9118      var maxCutEnd = Math.min(newBot.length - (newText.length == 1 ? cutFront : 0),
9119                               oldBot.length - (oldText.length == 1 ? cutFront : 0));
9120      while (cutEnd < maxCutEnd &&
9121             newBot.charCodeAt(newBot.length - cutEnd - 1) == oldBot.charCodeAt(oldBot.length - cutEnd - 1))
9122        { ++cutEnd; }
9123      // Try to move start of change to start of selection if ambiguous
9124      if (newText.length == 1 && oldText.length == 1 && fromLine == from.line) {
9125        while (cutFront && cutFront > from.ch &&
9126               newBot.charCodeAt(newBot.length - cutEnd - 1) == oldBot.charCodeAt(oldBot.length - cutEnd - 1)) {
9127          cutFront--;
9128          cutEnd++;
9129        }
9130      }
9131  
9132      newText[newText.length - 1] = newBot.slice(0, newBot.length - cutEnd).replace(/^\u200b+/, "");
9133      newText[0] = newText[0].slice(cutFront).replace(/\u200b+$/, "");
9134  
9135      var chFrom = Pos(fromLine, cutFront);
9136      var chTo = Pos(toLine, oldText.length ? lst(oldText).length - cutEnd : 0);
9137      if (newText.length > 1 || newText[0] || cmp(chFrom, chTo)) {
9138        replaceRange(cm.doc, newText, chFrom, chTo, "+input");
9139        return true
9140      }
9141    };
9142  
9143    ContentEditableInput.prototype.ensurePolled = function () {
9144      this.forceCompositionEnd();
9145    };
9146    ContentEditableInput.prototype.reset = function () {
9147      this.forceCompositionEnd();
9148    };
9149    ContentEditableInput.prototype.forceCompositionEnd = function () {
9150      if (!this.composing) { return }
9151      clearTimeout(this.readDOMTimeout);
9152      this.composing = null;
9153      this.updateFromDOM();
9154      this.div.blur();
9155      this.div.focus();
9156    };
9157    ContentEditableInput.prototype.readFromDOMSoon = function () {
9158        var this$1 = this;
9159  
9160      if (this.readDOMTimeout != null) { return }
9161      this.readDOMTimeout = setTimeout(function () {
9162        this$1.readDOMTimeout = null;
9163        if (this$1.composing) {
9164          if (this$1.composing.done) { this$1.composing = null; }
9165          else { return }
9166        }
9167        this$1.updateFromDOM();
9168      }, 80);
9169    };
9170  
9171    ContentEditableInput.prototype.updateFromDOM = function () {
9172        var this$1 = this;
9173  
9174      if (this.cm.isReadOnly() || !this.pollContent())
9175        { runInOp(this.cm, function () { return regChange(this$1.cm); }); }
9176    };
9177  
9178    ContentEditableInput.prototype.setUneditable = function (node) {
9179      node.contentEditable = "false";
9180    };
9181  
9182    ContentEditableInput.prototype.onKeyPress = function (e) {
9183      if (e.charCode == 0 || this.composing) { return }
9184      e.preventDefault();
9185      if (!this.cm.isReadOnly())
9186        { operation(this.cm, applyTextInput)(this.cm, String.fromCharCode(e.charCode == null ? e.keyCode : e.charCode), 0); }
9187    };
9188  
9189    ContentEditableInput.prototype.readOnlyChanged = function (val) {
9190      this.div.contentEditable = String(val != "nocursor");
9191    };
9192  
9193    ContentEditableInput.prototype.onContextMenu = function () {};
9194    ContentEditableInput.prototype.resetPosition = function () {};
9195  
9196    ContentEditableInput.prototype.needsContentAttribute = true;
9197  
9198    function posToDOM(cm, pos) {
9199      var view = findViewForLine(cm, pos.line);
9200      if (!view || view.hidden) { return null }
9201      var line = getLine(cm.doc, pos.line);
9202      var info = mapFromLineView(view, line, pos.line);
9203  
9204      var order = getOrder(line, cm.doc.direction), side = "left";
9205      if (order) {
9206        var partPos = getBidiPartAt(order, pos.ch);
9207        side = partPos % 2 ? "right" : "left";
9208      }
9209      var result = nodeAndOffsetInLineMap(info.map, pos.ch, side);
9210      result.offset = result.collapse == "right" ? result.end : result.start;
9211      return result
9212    }
9213  
9214    function isInGutter(node) {
9215      for (var scan = node; scan; scan = scan.parentNode)
9216        { if (/CodeMirror-gutter-wrapper/.test(scan.className)) { return true } }
9217      return false
9218    }
9219  
9220    function badPos(pos, bad) { if (bad) { pos.bad = true; } return pos }
9221  
9222    function domTextBetween(cm, from, to, fromLine, toLine) {
9223      var text = "", closing = false, lineSep = cm.doc.lineSeparator(), extraLinebreak = false;
9224      function recognizeMarker(id) { return function (marker) { return marker.id == id; } }
9225      function close() {
9226        if (closing) {
9227          text += lineSep;
9228          if (extraLinebreak) { text += lineSep; }
9229          closing = extraLinebreak = false;
9230        }
9231      }
9232      function addText(str) {
9233        if (str) {
9234          close();
9235          text += str;
9236        }
9237      }
9238      function walk(node) {
9239        if (node.nodeType == 1) {
9240          var cmText = node.getAttribute("cm-text");
9241          if (cmText) {
9242            addText(cmText);
9243            return
9244          }
9245          var markerID = node.getAttribute("cm-marker"), range;
9246          if (markerID) {
9247            var found = cm.findMarks(Pos(fromLine, 0), Pos(toLine + 1, 0), recognizeMarker(+markerID));
9248            if (found.length && (range = found[0].find(0)))
9249              { addText(getBetween(cm.doc, range.from, range.to).join(lineSep)); }
9250            return
9251          }
9252          if (node.getAttribute("contenteditable") == "false") { return }
9253          var isBlock = /^(pre|div|p|li|table|br)$/i.test(node.nodeName);
9254          if (!/^br$/i.test(node.nodeName) && node.textContent.length == 0) { return }
9255  
9256          if (isBlock) { close(); }
9257          for (var i = 0; i < node.childNodes.length; i++)
9258            { walk(node.childNodes[i]); }
9259  
9260          if (/^(pre|p)$/i.test(node.nodeName)) { extraLinebreak = true; }
9261          if (isBlock) { closing = true; }
9262        } else if (node.nodeType == 3) {
9263          addText(node.nodeValue.replace(/\u200b/g, "").replace(/\u00a0/g, " "));
9264        }
9265      }
9266      for (;;) {
9267        walk(from);
9268        if (from == to) { break }
9269        from = from.nextSibling;
9270        extraLinebreak = false;
9271      }
9272      return text
9273    }
9274  
9275    function domToPos(cm, node, offset) {
9276      var lineNode;
9277      if (node == cm.display.lineDiv) {
9278        lineNode = cm.display.lineDiv.childNodes[offset];
9279        if (!lineNode) { return badPos(cm.clipPos(Pos(cm.display.viewTo - 1)), true) }
9280        node = null; offset = 0;
9281      } else {
9282        for (lineNode = node;; lineNode = lineNode.parentNode) {
9283          if (!lineNode || lineNode == cm.display.lineDiv) { return null }
9284          if (lineNode.parentNode && lineNode.parentNode == cm.display.lineDiv) { break }
9285        }
9286      }
9287      for (var i = 0; i < cm.display.view.length; i++) {
9288        var lineView = cm.display.view[i];
9289        if (lineView.node == lineNode)
9290          { return locateNodeInLineView(lineView, node, offset) }
9291      }
9292    }
9293  
9294    function locateNodeInLineView(lineView, node, offset) {
9295      var wrapper = lineView.text.firstChild, bad = false;
9296      if (!node || !contains(wrapper, node)) { return badPos(Pos(lineNo(lineView.line), 0), true) }
9297      if (node == wrapper) {
9298        bad = true;
9299        node = wrapper.childNodes[offset];
9300        offset = 0;
9301        if (!node) {
9302          var line = lineView.rest ? lst(lineView.rest) : lineView.line;
9303          return badPos(Pos(lineNo(line), line.text.length), bad)
9304        }
9305      }
9306  
9307      var textNode = node.nodeType == 3 ? node : null, topNode = node;
9308      if (!textNode && node.childNodes.length == 1 && node.firstChild.nodeType == 3) {
9309        textNode = node.firstChild;
9310        if (offset) { offset = textNode.nodeValue.length; }
9311      }
9312      while (topNode.parentNode != wrapper) { topNode = topNode.parentNode; }
9313      var measure = lineView.measure, maps = measure.maps;
9314  
9315      function find(textNode, topNode, offset) {
9316        for (var i = -1; i < (maps ? maps.length : 0); i++) {
9317          var map = i < 0 ? measure.map : maps[i];
9318          for (var j = 0; j < map.length; j += 3) {
9319            var curNode = map[j + 2];
9320            if (curNode == textNode || curNode == topNode) {
9321              var line = lineNo(i < 0 ? lineView.line : lineView.rest[i]);
9322              var ch = map[j] + offset;
9323              if (offset < 0 || curNode != textNode) { ch = map[j + (offset ? 1 : 0)]; }
9324              return Pos(line, ch)
9325            }
9326          }
9327        }
9328      }
9329      var found = find(textNode, topNode, offset);
9330      if (found) { return badPos(found, bad) }
9331  
9332      // FIXME this is all really shaky. might handle the few cases it needs to handle, but likely to cause problems
9333      for (var after = topNode.nextSibling, dist = textNode ? textNode.nodeValue.length - offset : 0; after; after = after.nextSibling) {
9334        found = find(after, after.firstChild, 0);
9335        if (found)
9336          { return badPos(Pos(found.line, found.ch - dist), bad) }
9337        else
9338          { dist += after.textContent.length; }
9339      }
9340      for (var before = topNode.previousSibling, dist$1 = offset; before; before = before.previousSibling) {
9341        found = find(before, before.firstChild, -1);
9342        if (found)
9343          { return badPos(Pos(found.line, found.ch + dist$1), bad) }
9344        else
9345          { dist$1 += before.textContent.length; }
9346      }
9347    }
9348  
9349    // TEXTAREA INPUT STYLE
9350  
9351    var TextareaInput = function(cm) {
9352      this.cm = cm;
9353      // See input.poll and input.reset
9354      this.prevInput = "";
9355  
9356      // Flag that indicates whether we expect input to appear real soon
9357      // now (after some event like 'keypress' or 'input') and are
9358      // polling intensively.
9359      this.pollingFast = false;
9360      // Self-resetting timeout for the poller
9361      this.polling = new Delayed();
9362      // Used to work around IE issue with selection being forgotten when focus moves away from textarea
9363      this.hasSelection = false;
9364      this.composing = null;
9365    };
9366  
9367    TextareaInput.prototype.init = function (display) {
9368        var this$1 = this;
9369  
9370      var input = this, cm = this.cm;
9371      this.createField(display);
9372      var te = this.textarea;
9373  
9374      display.wrapper.insertBefore(this.wrapper, display.wrapper.firstChild);
9375  
9376      // Needed to hide big blue blinking cursor on Mobile Safari (doesn't seem to work in iOS 8 anymore)
9377      if (ios) { te.style.width = "0px"; }
9378  
9379      on(te, "input", function () {
9380        if (ie && ie_version >= 9 && this$1.hasSelection) { this$1.hasSelection = null; }
9381        input.poll();
9382      });
9383  
9384      on(te, "paste", function (e) {
9385        if (signalDOMEvent(cm, e) || handlePaste(e, cm)) { return }
9386  
9387        cm.state.pasteIncoming = +new Date;
9388        input.fastPoll();
9389      });
9390  
9391      function prepareCopyCut(e) {
9392        if (signalDOMEvent(cm, e)) { return }
9393        if (cm.somethingSelected()) {
9394          setLastCopied({lineWise: false, text: cm.getSelections()});
9395        } else if (!cm.options.lineWiseCopyCut) {
9396          return
9397        } else {
9398          var ranges = copyableRanges(cm);
9399          setLastCopied({lineWise: true, text: ranges.text});
9400          if (e.type == "cut") {
9401            cm.setSelections(ranges.ranges, null, sel_dontScroll);
9402          } else {
9403            input.prevInput = "";
9404            te.value = ranges.text.join("\n");
9405            selectInput(te);
9406          }
9407        }
9408        if (e.type == "cut") { cm.state.cutIncoming = +new Date; }
9409      }
9410      on(te, "cut", prepareCopyCut);
9411      on(te, "copy", prepareCopyCut);
9412  
9413      on(display.scroller, "paste", function (e) {
9414        if (eventInWidget(display, e) || signalDOMEvent(cm, e)) { return }
9415        if (!te.dispatchEvent) {
9416          cm.state.pasteIncoming = +new Date;
9417          input.focus();
9418          return
9419        }
9420  
9421        // Pass the `paste` event to the textarea so it's handled by its event listener.
9422        var event = new Event("paste");
9423        event.clipboardData = e.clipboardData;
9424        te.dispatchEvent(event);
9425      });
9426  
9427      // Prevent normal selection in the editor (we handle our own)
9428      on(display.lineSpace, "selectstart", function (e) {
9429        if (!eventInWidget(display, e)) { e_preventDefault(e); }
9430      });
9431  
9432      on(te, "compositionstart", function () {
9433        var start = cm.getCursor("from");
9434        if (input.composing) { input.composing.range.clear(); }
9435        input.composing = {
9436          start: start,
9437          range: cm.markText(start, cm.getCursor("to"), {className: "CodeMirror-composing"})
9438        };
9439      });
9440      on(te, "compositionend", function () {
9441        if (input.composing) {
9442          input.poll();
9443          input.composing.range.clear();
9444          input.composing = null;
9445        }
9446      });
9447    };
9448  
9449    TextareaInput.prototype.createField = function (_display) {
9450      // Wraps and hides input textarea
9451      this.wrapper = hiddenTextarea();
9452      // The semihidden textarea that is focused when the editor is
9453      // focused, and receives input.
9454      this.textarea = this.wrapper.firstChild;
9455    };
9456  
9457    TextareaInput.prototype.screenReaderLabelChanged = function (label) {
9458      // Label for screenreaders, accessibility
9459      if(label) {
9460        this.textarea.setAttribute('aria-label', label);
9461      } else {
9462        this.textarea.removeAttribute('aria-label');
9463      }
9464    };
9465  
9466    TextareaInput.prototype.prepareSelection = function () {
9467      // Redraw the selection and/or cursor
9468      var cm = this.cm, display = cm.display, doc = cm.doc;
9469      var result = prepareSelection(cm);
9470  
9471      // Move the hidden textarea near the cursor to prevent scrolling artifacts
9472      if (cm.options.moveInputWithCursor) {
9473        var headPos = cursorCoords(cm, doc.sel.primary().head, "div");
9474        var wrapOff = display.wrapper.getBoundingClientRect(), lineOff = display.lineDiv.getBoundingClientRect();
9475        result.teTop = Math.max(0, Math.min(display.wrapper.clientHeight - 10,
9476                                            headPos.top + lineOff.top - wrapOff.top));
9477        result.teLeft = Math.max(0, Math.min(display.wrapper.clientWidth - 10,
9478                                             headPos.left + lineOff.left - wrapOff.left));
9479      }
9480  
9481      return result
9482    };
9483  
9484    TextareaInput.prototype.showSelection = function (drawn) {
9485      var cm = this.cm, display = cm.display;
9486      removeChildrenAndAdd(display.cursorDiv, drawn.cursors);
9487      removeChildrenAndAdd(display.selectionDiv, drawn.selection);
9488      if (drawn.teTop != null) {
9489        this.wrapper.style.top = drawn.teTop + "px";
9490        this.wrapper.style.left = drawn.teLeft + "px";
9491      }
9492    };
9493  
9494    // Reset the input to correspond to the selection (or to be empty,
9495    // when not typing and nothing is selected)
9496    TextareaInput.prototype.reset = function (typing) {
9497      if (this.contextMenuPending || this.composing) { return }
9498      var cm = this.cm;
9499      if (cm.somethingSelected()) {
9500        this.prevInput = "";
9501        var content = cm.getSelection();
9502        this.textarea.value = content;
9503        if (cm.state.focused) { selectInput(this.textarea); }
9504        if (ie && ie_version >= 9) { this.hasSelection = content; }
9505      } else if (!typing) {
9506        this.prevInput = this.textarea.value = "";
9507        if (ie && ie_version >= 9) { this.hasSelection = null; }
9508      }
9509    };
9510  
9511    TextareaInput.prototype.getField = function () { return this.textarea };
9512  
9513    TextareaInput.prototype.supportsTouch = function () { return false };
9514  
9515    TextareaInput.prototype.focus = function () {
9516      if (this.cm.options.readOnly != "nocursor" && (!mobile || activeElt() != this.textarea)) {
9517        try { this.textarea.focus(); }
9518        catch (e) {} // IE8 will throw if the textarea is display: none or not in DOM
9519      }
9520    };
9521  
9522    TextareaInput.prototype.blur = function () { this.textarea.blur(); };
9523  
9524    TextareaInput.prototype.resetPosition = function () {
9525      this.wrapper.style.top = this.wrapper.style.left = 0;
9526    };
9527  
9528    TextareaInput.prototype.receivedFocus = function () { this.slowPoll(); };
9529  
9530    // Poll for input changes, using the normal rate of polling. This
9531    // runs as long as the editor is focused.
9532    TextareaInput.prototype.slowPoll = function () {
9533        var this$1 = this;
9534  
9535      if (this.pollingFast) { return }
9536      this.polling.set(this.cm.options.pollInterval, function () {
9537        this$1.poll();
9538        if (this$1.cm.state.focused) { this$1.slowPoll(); }
9539      });
9540    };
9541  
9542    // When an event has just come in that is likely to add or change
9543    // something in the input textarea, we poll faster, to ensure that
9544    // the change appears on the screen quickly.
9545    TextareaInput.prototype.fastPoll = function () {
9546      var missed = false, input = this;
9547      input.pollingFast = true;
9548      function p() {
9549        var changed = input.poll();
9550        if (!changed && !missed) {missed = true; input.polling.set(60, p);}
9551        else {input.pollingFast = false; input.slowPoll();}
9552      }
9553      input.polling.set(20, p);
9554    };
9555  
9556    // Read input from the textarea, and update the document to match.
9557    // When something is selected, it is present in the textarea, and
9558    // selected (unless it is huge, in which case a placeholder is
9559    // used). When nothing is selected, the cursor sits after previously
9560    // seen text (can be empty), which is stored in prevInput (we must
9561    // not reset the textarea when typing, because that breaks IME).
9562    TextareaInput.prototype.poll = function () {
9563        var this$1 = this;
9564  
9565      var cm = this.cm, input = this.textarea, prevInput = this.prevInput;
9566      // Since this is called a *lot*, try to bail out as cheaply as
9567      // possible when it is clear that nothing happened. hasSelection
9568      // will be the case when there is a lot of text in the textarea,
9569      // in which case reading its value would be expensive.
9570      if (this.contextMenuPending || !cm.state.focused ||
9571          (hasSelection(input) && !prevInput && !this.composing) ||
9572          cm.isReadOnly() || cm.options.disableInput || cm.state.keySeq)
9573        { return false }
9574  
9575      var text = input.value;
9576      // If nothing changed, bail.
9577      if (text == prevInput && !cm.somethingSelected()) { return false }
9578      // Work around nonsensical selection resetting in IE9/10, and
9579      // inexplicable appearance of private area unicode characters on
9580      // some key combos in Mac (#2689).
9581      if (ie && ie_version >= 9 && this.hasSelection === text ||
9582          mac && /[\uf700-\uf7ff]/.test(text)) {
9583        cm.display.input.reset();
9584        return false
9585      }
9586  
9587      if (cm.doc.sel == cm.display.selForContextMenu) {
9588        var first = text.charCodeAt(0);
9589        if (first == 0x200b && !prevInput) { prevInput = "\u200b"; }
9590        if (first == 0x21da) { this.reset(); return this.cm.execCommand("undo") }
9591      }
9592      // Find the part of the input that is actually new
9593      var same = 0, l = Math.min(prevInput.length, text.length);
9594      while (same < l && prevInput.charCodeAt(same) == text.charCodeAt(same)) { ++same; }
9595  
9596      runInOp(cm, function () {
9597        applyTextInput(cm, text.slice(same), prevInput.length - same,
9598                       null, this$1.composing ? "*compose" : null);
9599  
9600        // Don't leave long text in the textarea, since it makes further polling slow
9601        if (text.length > 1000 || text.indexOf("\n") > -1) { input.value = this$1.prevInput = ""; }
9602        else { this$1.prevInput = text; }
9603  
9604        if (this$1.composing) {
9605          this$1.composing.range.clear();
9606          this$1.composing.range = cm.markText(this$1.composing.start, cm.getCursor("to"),
9607                                             {className: "CodeMirror-composing"});
9608        }
9609      });
9610      return true
9611    };
9612  
9613    TextareaInput.prototype.ensurePolled = function () {
9614      if (this.pollingFast && this.poll()) { this.pollingFast = false; }
9615    };
9616  
9617    TextareaInput.prototype.onKeyPress = function () {
9618      if (ie && ie_version >= 9) { this.hasSelection = null; }
9619      this.fastPoll();
9620    };
9621  
9622    TextareaInput.prototype.onContextMenu = function (e) {
9623      var input = this, cm = input.cm, display = cm.display, te = input.textarea;
9624      if (input.contextMenuPending) { input.contextMenuPending(); }
9625      var pos = posFromMouse(cm, e), scrollPos = display.scroller.scrollTop;
9626      if (!pos || presto) { return } // Opera is difficult.
9627  
9628      // Reset the current text selection only if the click is done outside of the selection
9629      // and 'resetSelectionOnContextMenu' option is true.
9630      var reset = cm.options.resetSelectionOnContextMenu;
9631      if (reset && cm.doc.sel.contains(pos) == -1)
9632        { operation(cm, setSelection)(cm.doc, simpleSelection(pos), sel_dontScroll); }
9633  
9634      var oldCSS = te.style.cssText, oldWrapperCSS = input.wrapper.style.cssText;
9635      var wrapperBox = input.wrapper.offsetParent.getBoundingClientRect();
9636      input.wrapper.style.cssText = "position: static";
9637      te.style.cssText = "position: absolute; width: 30px; height: 30px;\n      top: " + (e.clientY - wrapperBox.top - 5) + "px; left: " + (e.clientX - wrapperBox.left - 5) + "px;\n      z-index: 1000; background: " + (ie ? "rgba(255, 255, 255, .05)" : "transparent") + ";\n      outline: none; border-width: 0; outline: none; overflow: hidden; opacity: .05; filter: alpha(opacity=5);";
9638      var oldScrollY;
9639      if (webkit) { oldScrollY = window.scrollY; } // Work around Chrome issue (#2712)
9640      display.input.focus();
9641      if (webkit) { window.scrollTo(null, oldScrollY); }
9642      display.input.reset();
9643      // Adds "Select all" to context menu in FF
9644      if (!cm.somethingSelected()) { te.value = input.prevInput = " "; }
9645      input.contextMenuPending = rehide;
9646      display.selForContextMenu = cm.doc.sel;
9647      clearTimeout(display.detectingSelectAll);
9648  
9649      // Select-all will be greyed out if there's nothing to select, so
9650      // this adds a zero-width space so that we can later check whether
9651      // it got selected.
9652      function prepareSelectAllHack() {
9653        if (te.selectionStart != null) {
9654          var selected = cm.somethingSelected();
9655          var extval = "\u200b" + (selected ? te.value : "");
9656          te.value = "\u21da"; // Used to catch context-menu undo
9657          te.value = extval;
9658          input.prevInput = selected ? "" : "\u200b";
9659          te.selectionStart = 1; te.selectionEnd = extval.length;
9660          // Re-set this, in case some other handler touched the
9661          // selection in the meantime.
9662          display.selForContextMenu = cm.doc.sel;
9663        }
9664      }
9665      function rehide() {
9666        if (input.contextMenuPending != rehide) { return }
9667        input.contextMenuPending = false;
9668        input.wrapper.style.cssText = oldWrapperCSS;
9669        te.style.cssText = oldCSS;
9670        if (ie && ie_version < 9) { display.scrollbars.setScrollTop(display.scroller.scrollTop = scrollPos); }
9671  
9672        // Try to detect the user choosing select-all
9673        if (te.selectionStart != null) {
9674          if (!ie || (ie && ie_version < 9)) { prepareSelectAllHack(); }
9675          var i = 0, poll = function () {
9676            if (display.selForContextMenu == cm.doc.sel && te.selectionStart == 0 &&
9677                te.selectionEnd > 0 && input.prevInput == "\u200b") {
9678              operation(cm, selectAll)(cm);
9679            } else if (i++ < 10) {
9680              display.detectingSelectAll = setTimeout(poll, 500);
9681            } else {
9682              display.selForContextMenu = null;
9683              display.input.reset();
9684            }
9685          };
9686          display.detectingSelectAll = setTimeout(poll, 200);
9687        }
9688      }
9689  
9690      if (ie && ie_version >= 9) { prepareSelectAllHack(); }
9691      if (captureRightClick) {
9692        e_stop(e);
9693        var mouseup = function () {
9694          off(window, "mouseup", mouseup);
9695          setTimeout(rehide, 20);
9696        };
9697        on(window, "mouseup", mouseup);
9698      } else {
9699        setTimeout(rehide, 50);
9700      }
9701    };
9702  
9703    TextareaInput.prototype.readOnlyChanged = function (val) {
9704      if (!val) { this.reset(); }
9705      this.textarea.disabled = val == "nocursor";
9706      this.textarea.readOnly = !!val;
9707    };
9708  
9709    TextareaInput.prototype.setUneditable = function () {};
9710  
9711    TextareaInput.prototype.needsContentAttribute = false;
9712  
9713    function fromTextArea(textarea, options) {
9714      options = options ? copyObj(options) : {};
9715      options.value = textarea.value;
9716      if (!options.tabindex && textarea.tabIndex)
9717        { options.tabindex = textarea.tabIndex; }
9718      if (!options.placeholder && textarea.placeholder)
9719        { options.placeholder = textarea.placeholder; }
9720      // Set autofocus to true if this textarea is focused, or if it has
9721      // autofocus and no other element is focused.
9722      if (options.autofocus == null) {
9723        var hasFocus = activeElt();
9724        options.autofocus = hasFocus == textarea ||
9725          textarea.getAttribute("autofocus") != null && hasFocus == document.body;
9726      }
9727  
9728      function save() {textarea.value = cm.getValue();}
9729  
9730      var realSubmit;
9731      if (textarea.form) {
9732        on(textarea.form, "submit", save);
9733        // Deplorable hack to make the submit method do the right thing.
9734        if (!options.leaveSubmitMethodAlone) {
9735          var form = textarea.form;
9736          realSubmit = form.submit;
9737          try {
9738            var wrappedSubmit = form.submit = function () {
9739              save();
9740              form.submit = realSubmit;
9741              form.submit();
9742              form.submit = wrappedSubmit;
9743            };
9744          } catch(e) {}
9745        }
9746      }
9747  
9748      options.finishInit = function (cm) {
9749        cm.save = save;
9750        cm.getTextArea = function () { return textarea; };
9751        cm.toTextArea = function () {
9752          cm.toTextArea = isNaN; // Prevent this from being ran twice
9753          save();
9754          textarea.parentNode.removeChild(cm.getWrapperElement());
9755          textarea.style.display = "";
9756          if (textarea.form) {
9757            off(textarea.form, "submit", save);
9758            if (!options.leaveSubmitMethodAlone && typeof textarea.form.submit == "function")
9759              { textarea.form.submit = realSubmit; }
9760          }
9761        };
9762      };
9763  
9764      textarea.style.display = "none";
9765      var cm = CodeMirror(function (node) { return textarea.parentNode.insertBefore(node, textarea.nextSibling); },
9766        options);
9767      return cm
9768    }
9769  
9770    function addLegacyProps(CodeMirror) {
9771      CodeMirror.off = off;
9772      CodeMirror.on = on;
9773      CodeMirror.wheelEventPixels = wheelEventPixels;
9774      CodeMirror.Doc = Doc;
9775      CodeMirror.splitLines = splitLinesAuto;
9776      CodeMirror.countColumn = countColumn;
9777      CodeMirror.findColumn = findColumn;
9778      CodeMirror.isWordChar = isWordCharBasic;
9779      CodeMirror.Pass = Pass;
9780      CodeMirror.signal = signal;
9781      CodeMirror.Line = Line;
9782      CodeMirror.changeEnd = changeEnd;
9783      CodeMirror.scrollbarModel = scrollbarModel;
9784      CodeMirror.Pos = Pos;
9785      CodeMirror.cmpPos = cmp;
9786      CodeMirror.modes = modes;
9787      CodeMirror.mimeModes = mimeModes;
9788      CodeMirror.resolveMode = resolveMode;
9789      CodeMirror.getMode = getMode;
9790      CodeMirror.modeExtensions = modeExtensions;
9791      CodeMirror.extendMode = extendMode;
9792      CodeMirror.copyState = copyState;
9793      CodeMirror.startState = startState;
9794      CodeMirror.innerMode = innerMode;
9795      CodeMirror.commands = commands;
9796      CodeMirror.keyMap = keyMap;
9797      CodeMirror.keyName = keyName;
9798      CodeMirror.isModifierKey = isModifierKey;
9799      CodeMirror.lookupKey = lookupKey;
9800      CodeMirror.normalizeKeyMap = normalizeKeyMap;
9801      CodeMirror.StringStream = StringStream;
9802      CodeMirror.SharedTextMarker = SharedTextMarker;
9803      CodeMirror.TextMarker = TextMarker;
9804      CodeMirror.LineWidget = LineWidget;
9805      CodeMirror.e_preventDefault = e_preventDefault;
9806      CodeMirror.e_stopPropagation = e_stopPropagation;
9807      CodeMirror.e_stop = e_stop;
9808      CodeMirror.addClass = addClass;
9809      CodeMirror.contains = contains;
9810      CodeMirror.rmClass = rmClass;
9811      CodeMirror.keyNames = keyNames;
9812    }
9813  
9814    // EDITOR CONSTRUCTOR
9815  
9816    defineOptions(CodeMirror);
9817  
9818    addEditorMethods(CodeMirror);
9819  
9820    // Set up methods on CodeMirror's prototype to redirect to the editor's document.
9821    var dontDelegate = "iter insert remove copy getEditor constructor".split(" ");
9822    for (var prop in Doc.prototype) { if (Doc.prototype.hasOwnProperty(prop) && indexOf(dontDelegate, prop) < 0)
9823      { CodeMirror.prototype[prop] = (function(method) {
9824        return function() {return method.apply(this.doc, arguments)}
9825      })(Doc.prototype[prop]); } }
9826  
9827    eventMixin(Doc);
9828    CodeMirror.inputStyles = {"textarea": TextareaInput, "contenteditable": ContentEditableInput};
9829  
9830    // Extra arguments are stored as the mode's dependencies, which is
9831    // used by (legacy) mechanisms like loadmode.js to automatically
9832    // load a mode. (Preferred mechanism is the require/define calls.)
9833    CodeMirror.defineMode = function(name/*, mode, …*/) {
9834      if (!CodeMirror.defaults.mode && name != "null") { CodeMirror.defaults.mode = name; }
9835      defineMode.apply(this, arguments);
9836    };
9837  
9838    CodeMirror.defineMIME = defineMIME;
9839  
9840    // Minimal default mode.
9841    CodeMirror.defineMode("null", function () { return ({token: function (stream) { return stream.skipToEnd(); }}); });
9842    CodeMirror.defineMIME("text/plain", "null");
9843  
9844    // EXTENSIONS
9845  
9846    CodeMirror.defineExtension = function (name, func) {
9847      CodeMirror.prototype[name] = func;
9848    };
9849    CodeMirror.defineDocExtension = function (name, func) {
9850      Doc.prototype[name] = func;
9851    };
9852  
9853    CodeMirror.fromTextArea = fromTextArea;
9854  
9855    addLegacyProps(CodeMirror);
9856  
9857    CodeMirror.version = "5.65.6";
9858  
9859    return CodeMirror;
9860  
9861  })));