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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  (function(mod) {
   5    if (typeof exports == "object" && typeof module == "object") // CommonJS
   6      mod(require("../../lib/codemirror"), require("../xml/xml"), require("../meta"));
   7    else if (typeof define == "function" && define.amd) // AMD
   8      define(["../../lib/codemirror", "../xml/xml", "../meta"], mod);
   9    else // Plain browser env
  10      mod(CodeMirror);
  11  })(function(CodeMirror) {
  12  "use strict";
  13  
  14  CodeMirror.defineMode("markdown", function(cmCfg, modeCfg) {
  15  
  16    var htmlMode = CodeMirror.getMode(cmCfg, "text/html");
  17    var htmlModeMissing = htmlMode.name == "null"
  18  
  19    function getMode(name) {
  20      if (CodeMirror.findModeByName) {
  21        var found = CodeMirror.findModeByName(name);
  22        if (found) name = found.mime || found.mimes[0];
  23      }
  24      var mode = CodeMirror.getMode(cmCfg, name);
  25      return mode.name == "null" ? null : mode;
  26    }
  27  
  28    // Should characters that affect highlighting be highlighted separate?
  29    // Does not include characters that will be output (such as `1.` and `-` for lists)
  30    if (modeCfg.highlightFormatting === undefined)
  31      modeCfg.highlightFormatting = false;
  32  
  33    // Maximum number of nested blockquotes. Set to 0 for infinite nesting.
  34    // Excess `>` will emit `error` token.
  35    if (modeCfg.maxBlockquoteDepth === undefined)
  36      modeCfg.maxBlockquoteDepth = 0;
  37  
  38    // Turn on task lists? ("- [ ] " and "- [x] ")
  39    if (modeCfg.taskLists === undefined) modeCfg.taskLists = false;
  40  
  41    // Turn on strikethrough syntax
  42    if (modeCfg.strikethrough === undefined)
  43      modeCfg.strikethrough = false;
  44  
  45    if (modeCfg.emoji === undefined)
  46      modeCfg.emoji = false;
  47  
  48    if (modeCfg.fencedCodeBlockHighlighting === undefined)
  49      modeCfg.fencedCodeBlockHighlighting = true;
  50  
  51    if (modeCfg.fencedCodeBlockDefaultMode === undefined)
  52      modeCfg.fencedCodeBlockDefaultMode = 'text/plain';
  53  
  54    if (modeCfg.xml === undefined)
  55      modeCfg.xml = true;
  56  
  57    // Allow token types to be overridden by user-provided token types.
  58    if (modeCfg.tokenTypeOverrides === undefined)
  59      modeCfg.tokenTypeOverrides = {};
  60  
  61    var tokenTypes = {
  62      header: "header",
  63      code: "comment",
  64      quote: "quote",
  65      list1: "variable-2",
  66      list2: "variable-3",
  67      list3: "keyword",
  68      hr: "hr",
  69      image: "image",
  70      imageAltText: "image-alt-text",
  71      imageMarker: "image-marker",
  72      formatting: "formatting",
  73      linkInline: "link",
  74      linkEmail: "link",
  75      linkText: "link",
  76      linkHref: "string",
  77      em: "em",
  78      strong: "strong",
  79      strikethrough: "strikethrough",
  80      emoji: "builtin"
  81    };
  82  
  83    for (var tokenType in tokenTypes) {
  84      if (tokenTypes.hasOwnProperty(tokenType) && modeCfg.tokenTypeOverrides[tokenType]) {
  85        tokenTypes[tokenType] = modeCfg.tokenTypeOverrides[tokenType];
  86      }
  87    }
  88  
  89    var hrRE = /^([*\-_])(?:\s*\1){2,}\s*$/
  90    ,   listRE = /^(?:[*\-+]|^[0-9]+([.)]))\s+/
  91    ,   taskListRE = /^\[(x| )\](?=\s)/i // Must follow listRE
  92    ,   atxHeaderRE = modeCfg.allowAtxHeaderWithoutSpace ? /^(#+)/ : /^(#+)(?: |$)/
  93    ,   setextHeaderRE = /^ {0,3}(?:\={1,}|-{2,})\s*$/
  94    ,   textRE = /^[^#!\[\]*_\\<>` "'(~:]+/
  95    ,   fencedCodeRE = /^(~~~+|```+)[ \t]*([\w\/+#-]*)[^\n`]*$/
  96    ,   linkDefRE = /^\s*\[[^\]]+?\]:.*$/ // naive link-definition
  97    ,   punctuation = /[!"#$%&'()*+,\-.\/:;<=>?@\[\\\]^_`{|}~\xA1\xA7\xAB\xB6\xB7\xBB\xBF\u037E\u0387\u055A-\u055F\u0589\u058A\u05BE\u05C0\u05C3\u05C6\u05F3\u05F4\u0609\u060A\u060C\u060D\u061B\u061E\u061F\u066A-\u066D\u06D4\u0700-\u070D\u07F7-\u07F9\u0830-\u083E\u085E\u0964\u0965\u0970\u0AF0\u0DF4\u0E4F\u0E5A\u0E5B\u0F04-\u0F12\u0F14\u0F3A-\u0F3D\u0F85\u0FD0-\u0FD4\u0FD9\u0FDA\u104A-\u104F\u10FB\u1360-\u1368\u1400\u166D\u166E\u169B\u169C\u16EB-\u16ED\u1735\u1736\u17D4-\u17D6\u17D8-\u17DA\u1800-\u180A\u1944\u1945\u1A1E\u1A1F\u1AA0-\u1AA6\u1AA8-\u1AAD\u1B5A-\u1B60\u1BFC-\u1BFF\u1C3B-\u1C3F\u1C7E\u1C7F\u1CC0-\u1CC7\u1CD3\u2010-\u2027\u2030-\u2043\u2045-\u2051\u2053-\u205E\u207D\u207E\u208D\u208E\u2308-\u230B\u2329\u232A\u2768-\u2775\u27C5\u27C6\u27E6-\u27EF\u2983-\u2998\u29D8-\u29DB\u29FC\u29FD\u2CF9-\u2CFC\u2CFE\u2CFF\u2D70\u2E00-\u2E2E\u2E30-\u2E42\u3001-\u3003\u3008-\u3011\u3014-\u301F\u3030\u303D\u30A0\u30FB\uA4FE\uA4FF\uA60D-\uA60F\uA673\uA67E\uA6F2-\uA6F7\uA874-\uA877\uA8CE\uA8CF\uA8F8-\uA8FA\uA8FC\uA92E\uA92F\uA95F\uA9C1-\uA9CD\uA9DE\uA9DF\uAA5C-\uAA5F\uAADE\uAADF\uAAF0\uAAF1\uABEB\uFD3E\uFD3F\uFE10-\uFE19\uFE30-\uFE52\uFE54-\uFE61\uFE63\uFE68\uFE6A\uFE6B\uFF01-\uFF03\uFF05-\uFF0A\uFF0C-\uFF0F\uFF1A\uFF1B\uFF1F\uFF20\uFF3B-\uFF3D\uFF3F\uFF5B\uFF5D\uFF5F-\uFF65]|\uD800[\uDD00-\uDD02\uDF9F\uDFD0]|\uD801\uDD6F|\uD802[\uDC57\uDD1F\uDD3F\uDE50-\uDE58\uDE7F\uDEF0-\uDEF6\uDF39-\uDF3F\uDF99-\uDF9C]|\uD804[\uDC47-\uDC4D\uDCBB\uDCBC\uDCBE-\uDCC1\uDD40-\uDD43\uDD74\uDD75\uDDC5-\uDDC9\uDDCD\uDDDB\uDDDD-\uDDDF\uDE38-\uDE3D\uDEA9]|\uD805[\uDCC6\uDDC1-\uDDD7\uDE41-\uDE43\uDF3C-\uDF3E]|\uD809[\uDC70-\uDC74]|\uD81A[\uDE6E\uDE6F\uDEF5\uDF37-\uDF3B\uDF44]|\uD82F\uDC9F|\uD836[\uDE87-\uDE8B]/
  98    ,   expandedTab = "    " // CommonMark specifies tab as 4 spaces
  99  
 100    function switchInline(stream, state, f) {
 101      state.f = state.inline = f;
 102      return f(stream, state);
 103    }
 104  
 105    function switchBlock(stream, state, f) {
 106      state.f = state.block = f;
 107      return f(stream, state);
 108    }
 109  
 110    function lineIsEmpty(line) {
 111      return !line || !/\S/.test(line.string)
 112    }
 113  
 114    // Blocks
 115  
 116    function blankLine(state) {
 117      // Reset linkTitle state
 118      state.linkTitle = false;
 119      state.linkHref = false;
 120      state.linkText = false;
 121      // Reset EM state
 122      state.em = false;
 123      // Reset STRONG state
 124      state.strong = false;
 125      // Reset strikethrough state
 126      state.strikethrough = false;
 127      // Reset state.quote
 128      state.quote = 0;
 129      // Reset state.indentedCode
 130      state.indentedCode = false;
 131      if (state.f == htmlBlock) {
 132        var exit = htmlModeMissing
 133        if (!exit) {
 134          var inner = CodeMirror.innerMode(htmlMode, state.htmlState)
 135          exit = inner.mode.name == "xml" && inner.state.tagStart === null &&
 136            (!inner.state.context && inner.state.tokenize.isInText)
 137        }
 138        if (exit) {
 139          state.f = inlineNormal;
 140          state.block = blockNormal;
 141          state.htmlState = null;
 142        }
 143      }
 144      // Reset state.trailingSpace
 145      state.trailingSpace = 0;
 146      state.trailingSpaceNewLine = false;
 147      // Mark this line as blank
 148      state.prevLine = state.thisLine
 149      state.thisLine = {stream: null}
 150      return null;
 151    }
 152  
 153    function blockNormal(stream, state) {
 154      var firstTokenOnLine = stream.column() === state.indentation;
 155      var prevLineLineIsEmpty = lineIsEmpty(state.prevLine.stream);
 156      var prevLineIsIndentedCode = state.indentedCode;
 157      var prevLineIsHr = state.prevLine.hr;
 158      var prevLineIsList = state.list !== false;
 159      var maxNonCodeIndentation = (state.listStack[state.listStack.length - 1] || 0) + 3;
 160  
 161      state.indentedCode = false;
 162  
 163      var lineIndentation = state.indentation;
 164      // compute once per line (on first token)
 165      if (state.indentationDiff === null) {
 166        state.indentationDiff = state.indentation;
 167        if (prevLineIsList) {
 168          state.list = null;
 169          // While this list item's marker's indentation is less than the deepest
 170          //  list item's content's indentation,pop the deepest list item
 171          //  indentation off the stack, and update block indentation state
 172          while (lineIndentation < state.listStack[state.listStack.length - 1]) {
 173            state.listStack.pop();
 174            if (state.listStack.length) {
 175              state.indentation = state.listStack[state.listStack.length - 1];
 176            // less than the first list's indent -> the line is no longer a list
 177            } else {
 178              state.list = false;
 179            }
 180          }
 181          if (state.list !== false) {
 182            state.indentationDiff = lineIndentation - state.listStack[state.listStack.length - 1]
 183          }
 184        }
 185      }
 186  
 187      // not comprehensive (currently only for setext detection purposes)
 188      var allowsInlineContinuation = (
 189          !prevLineLineIsEmpty && !prevLineIsHr && !state.prevLine.header &&
 190          (!prevLineIsList || !prevLineIsIndentedCode) &&
 191          !state.prevLine.fencedCodeEnd
 192      );
 193  
 194      var isHr = (state.list === false || prevLineIsHr || prevLineLineIsEmpty) &&
 195        state.indentation <= maxNonCodeIndentation && stream.match(hrRE);
 196  
 197      var match = null;
 198      if (state.indentationDiff >= 4 && (prevLineIsIndentedCode || state.prevLine.fencedCodeEnd ||
 199           state.prevLine.header || prevLineLineIsEmpty)) {
 200        stream.skipToEnd();
 201        state.indentedCode = true;
 202        return tokenTypes.code;
 203      } else if (stream.eatSpace()) {
 204        return null;
 205      } else if (firstTokenOnLine && state.indentation <= maxNonCodeIndentation && (match = stream.match(atxHeaderRE)) && match[1].length <= 6) {
 206        state.quote = 0;
 207        state.header = match[1].length;
 208        state.thisLine.header = true;
 209        if (modeCfg.highlightFormatting) state.formatting = "header";
 210        state.f = state.inline;
 211        return getType(state);
 212      } else if (state.indentation <= maxNonCodeIndentation && stream.eat('>')) {
 213        state.quote = firstTokenOnLine ? 1 : state.quote + 1;
 214        if (modeCfg.highlightFormatting) state.formatting = "quote";
 215        stream.eatSpace();
 216        return getType(state);
 217      } else if (!isHr && !state.setext && firstTokenOnLine && state.indentation <= maxNonCodeIndentation && (match = stream.match(listRE))) {
 218        var listType = match[1] ? "ol" : "ul";
 219  
 220        state.indentation = lineIndentation + stream.current().length;
 221        state.list = true;
 222        state.quote = 0;
 223  
 224        // Add this list item's content's indentation to the stack
 225        state.listStack.push(state.indentation);
 226        // Reset inline styles which shouldn't propagate across list items
 227        state.em = false;
 228        state.strong = false;
 229        state.code = false;
 230        state.strikethrough = false;
 231  
 232        if (modeCfg.taskLists && stream.match(taskListRE, false)) {
 233          state.taskList = true;
 234        }
 235        state.f = state.inline;
 236        if (modeCfg.highlightFormatting) state.formatting = ["list", "list-" + listType];
 237        return getType(state);
 238      } else if (firstTokenOnLine && state.indentation <= maxNonCodeIndentation && (match = stream.match(fencedCodeRE, true))) {
 239        state.quote = 0;
 240        state.fencedEndRE = new RegExp(match[1] + "+ *$");
 241        // try switching mode
 242        state.localMode = modeCfg.fencedCodeBlockHighlighting && getMode(match[2] || modeCfg.fencedCodeBlockDefaultMode );
 243        if (state.localMode) state.localState = CodeMirror.startState(state.localMode);
 244        state.f = state.block = local;
 245        if (modeCfg.highlightFormatting) state.formatting = "code-block";
 246        state.code = -1
 247        return getType(state);
 248      // SETEXT has lowest block-scope precedence after HR, so check it after
 249      //  the others (code, blockquote, list...)
 250      } else if (
 251        // if setext set, indicates line after ---/===
 252        state.setext || (
 253          // line before ---/===
 254          (!allowsInlineContinuation || !prevLineIsList) && !state.quote && state.list === false &&
 255          !state.code && !isHr && !linkDefRE.test(stream.string) &&
 256          (match = stream.lookAhead(1)) && (match = match.match(setextHeaderRE))
 257        )
 258      ) {
 259        if ( !state.setext ) {
 260          state.header = match[0].charAt(0) == '=' ? 1 : 2;
 261          state.setext = state.header;
 262        } else {
 263          state.header = state.setext;
 264          // has no effect on type so we can reset it now
 265          state.setext = 0;
 266          stream.skipToEnd();
 267          if (modeCfg.highlightFormatting) state.formatting = "header";
 268        }
 269        state.thisLine.header = true;
 270        state.f = state.inline;
 271        return getType(state);
 272      } else if (isHr) {
 273        stream.skipToEnd();
 274        state.hr = true;
 275        state.thisLine.hr = true;
 276        return tokenTypes.hr;
 277      } else if (stream.peek() === '[') {
 278        return switchInline(stream, state, footnoteLink);
 279      }
 280  
 281      return switchInline(stream, state, state.inline);
 282    }
 283  
 284    function htmlBlock(stream, state) {
 285      var style = htmlMode.token(stream, state.htmlState);
 286      if (!htmlModeMissing) {
 287        var inner = CodeMirror.innerMode(htmlMode, state.htmlState)
 288        if ((inner.mode.name == "xml" && inner.state.tagStart === null &&
 289             (!inner.state.context && inner.state.tokenize.isInText)) ||
 290            (state.md_inside && stream.current().indexOf(">") > -1)) {
 291          state.f = inlineNormal;
 292          state.block = blockNormal;
 293          state.htmlState = null;
 294        }
 295      }
 296      return style;
 297    }
 298  
 299    function local(stream, state) {
 300      var currListInd = state.listStack[state.listStack.length - 1] || 0;
 301      var hasExitedList = state.indentation < currListInd;
 302      var maxFencedEndInd = currListInd + 3;
 303      if (state.fencedEndRE && state.indentation <= maxFencedEndInd && (hasExitedList || stream.match(state.fencedEndRE))) {
 304        if (modeCfg.highlightFormatting) state.formatting = "code-block";
 305        var returnType;
 306        if (!hasExitedList) returnType = getType(state)
 307        state.localMode = state.localState = null;
 308        state.block = blockNormal;
 309        state.f = inlineNormal;
 310        state.fencedEndRE = null;
 311        state.code = 0
 312        state.thisLine.fencedCodeEnd = true;
 313        if (hasExitedList) return switchBlock(stream, state, state.block);
 314        return returnType;
 315      } else if (state.localMode) {
 316        return state.localMode.token(stream, state.localState);
 317      } else {
 318        stream.skipToEnd();
 319        return tokenTypes.code;
 320      }
 321    }
 322  
 323    // Inline
 324    function getType(state) {
 325      var styles = [];
 326  
 327      if (state.formatting) {
 328        styles.push(tokenTypes.formatting);
 329  
 330        if (typeof state.formatting === "string") state.formatting = [state.formatting];
 331  
 332        for (var i = 0; i < state.formatting.length; i++) {
 333          styles.push(tokenTypes.formatting + "-" + state.formatting[i]);
 334  
 335          if (state.formatting[i] === "header") {
 336            styles.push(tokenTypes.formatting + "-" + state.formatting[i] + "-" + state.header);
 337          }
 338  
 339          // Add `formatting-quote` and `formatting-quote-#` for blockquotes
 340          // Add `error` instead if the maximum blockquote nesting depth is passed
 341          if (state.formatting[i] === "quote") {
 342            if (!modeCfg.maxBlockquoteDepth || modeCfg.maxBlockquoteDepth >= state.quote) {
 343              styles.push(tokenTypes.formatting + "-" + state.formatting[i] + "-" + state.quote);
 344            } else {
 345              styles.push("error");
 346            }
 347          }
 348        }
 349      }
 350  
 351      if (state.taskOpen) {
 352        styles.push("meta");
 353        return styles.length ? styles.join(' ') : null;
 354      }
 355      if (state.taskClosed) {
 356        styles.push("property");
 357        return styles.length ? styles.join(' ') : null;
 358      }
 359  
 360      if (state.linkHref) {
 361        styles.push(tokenTypes.linkHref, "url");
 362      } else { // Only apply inline styles to non-url text
 363        if (state.strong) { styles.push(tokenTypes.strong); }
 364        if (state.em) { styles.push(tokenTypes.em); }
 365        if (state.strikethrough) { styles.push(tokenTypes.strikethrough); }
 366        if (state.emoji) { styles.push(tokenTypes.emoji); }
 367        if (state.linkText) { styles.push(tokenTypes.linkText); }
 368        if (state.code) { styles.push(tokenTypes.code); }
 369        if (state.image) { styles.push(tokenTypes.image); }
 370        if (state.imageAltText) { styles.push(tokenTypes.imageAltText, "link"); }
 371        if (state.imageMarker) { styles.push(tokenTypes.imageMarker); }
 372      }
 373  
 374      if (state.header) { styles.push(tokenTypes.header, tokenTypes.header + "-" + state.header); }
 375  
 376      if (state.quote) {
 377        styles.push(tokenTypes.quote);
 378  
 379        // Add `quote-#` where the maximum for `#` is modeCfg.maxBlockquoteDepth
 380        if (!modeCfg.maxBlockquoteDepth || modeCfg.maxBlockquoteDepth >= state.quote) {
 381          styles.push(tokenTypes.quote + "-" + state.quote);
 382        } else {
 383          styles.push(tokenTypes.quote + "-" + modeCfg.maxBlockquoteDepth);
 384        }
 385      }
 386  
 387      if (state.list !== false) {
 388        var listMod = (state.listStack.length - 1) % 3;
 389        if (!listMod) {
 390          styles.push(tokenTypes.list1);
 391        } else if (listMod === 1) {
 392          styles.push(tokenTypes.list2);
 393        } else {
 394          styles.push(tokenTypes.list3);
 395        }
 396      }
 397  
 398      if (state.trailingSpaceNewLine) {
 399        styles.push("trailing-space-new-line");
 400      } else if (state.trailingSpace) {
 401        styles.push("trailing-space-" + (state.trailingSpace % 2 ? "a" : "b"));
 402      }
 403  
 404      return styles.length ? styles.join(' ') : null;
 405    }
 406  
 407    function handleText(stream, state) {
 408      if (stream.match(textRE, true)) {
 409        return getType(state);
 410      }
 411      return undefined;
 412    }
 413  
 414    function inlineNormal(stream, state) {
 415      var style = state.text(stream, state);
 416      if (typeof style !== 'undefined')
 417        return style;
 418  
 419      if (state.list) { // List marker (*, +, -, 1., etc)
 420        state.list = null;
 421        return getType(state);
 422      }
 423  
 424      if (state.taskList) {
 425        var taskOpen = stream.match(taskListRE, true)[1] === " ";
 426        if (taskOpen) state.taskOpen = true;
 427        else state.taskClosed = true;
 428        if (modeCfg.highlightFormatting) state.formatting = "task";
 429        state.taskList = false;
 430        return getType(state);
 431      }
 432  
 433      state.taskOpen = false;
 434      state.taskClosed = false;
 435  
 436      if (state.header && stream.match(/^#+$/, true)) {
 437        if (modeCfg.highlightFormatting) state.formatting = "header";
 438        return getType(state);
 439      }
 440  
 441      var ch = stream.next();
 442  
 443      // Matches link titles present on next line
 444      if (state.linkTitle) {
 445        state.linkTitle = false;
 446        var matchCh = ch;
 447        if (ch === '(') {
 448          matchCh = ')';
 449        }
 450        matchCh = (matchCh+'').replace(/([.?*+^\[\]\\(){}|-])/g, "\\$1");
 451        var regex = '^\\s*(?:[^' + matchCh + '\\\\]+|\\\\\\\\|\\\\.)' + matchCh;
 452        if (stream.match(new RegExp(regex), true)) {
 453          return tokenTypes.linkHref;
 454        }
 455      }
 456  
 457      // If this block is changed, it may need to be updated in GFM mode
 458      if (ch === '`') {
 459        var previousFormatting = state.formatting;
 460        if (modeCfg.highlightFormatting) state.formatting = "code";
 461        stream.eatWhile('`');
 462        var count = stream.current().length
 463        if (state.code == 0 && (!state.quote || count == 1)) {
 464          state.code = count
 465          return getType(state)
 466        } else if (count == state.code) { // Must be exact
 467          var t = getType(state)
 468          state.code = 0
 469          return t
 470        } else {
 471          state.formatting = previousFormatting
 472          return getType(state)
 473        }
 474      } else if (state.code) {
 475        return getType(state);
 476      }
 477  
 478      if (ch === '\\') {
 479        stream.next();
 480        if (modeCfg.highlightFormatting) {
 481          var type = getType(state);
 482          var formattingEscape = tokenTypes.formatting + "-escape";
 483          return type ? type + " " + formattingEscape : formattingEscape;
 484        }
 485      }
 486  
 487      if (ch === '!' && stream.match(/\[[^\]]*\] ?(?:\(|\[)/, false)) {
 488        state.imageMarker = true;
 489        state.image = true;
 490        if (modeCfg.highlightFormatting) state.formatting = "image";
 491        return getType(state);
 492      }
 493  
 494      if (ch === '[' && state.imageMarker && stream.match(/[^\]]*\](\(.*?\)| ?\[.*?\])/, false)) {
 495        state.imageMarker = false;
 496        state.imageAltText = true
 497        if (modeCfg.highlightFormatting) state.formatting = "image";
 498        return getType(state);
 499      }
 500  
 501      if (ch === ']' && state.imageAltText) {
 502        if (modeCfg.highlightFormatting) state.formatting = "image";
 503        var type = getType(state);
 504        state.imageAltText = false;
 505        state.image = false;
 506        state.inline = state.f = linkHref;
 507        return type;
 508      }
 509  
 510      if (ch === '[' && !state.image) {
 511        if (state.linkText && stream.match(/^.*?\]/)) return getType(state)
 512        state.linkText = true;
 513        if (modeCfg.highlightFormatting) state.formatting = "link";
 514        return getType(state);
 515      }
 516  
 517      if (ch === ']' && state.linkText) {
 518        if (modeCfg.highlightFormatting) state.formatting = "link";
 519        var type = getType(state);
 520        state.linkText = false;
 521        state.inline = state.f = stream.match(/\(.*?\)| ?\[.*?\]/, false) ? linkHref : inlineNormal
 522        return type;
 523      }
 524  
 525      if (ch === '<' && stream.match(/^(https?|ftps?):\/\/(?:[^\\>]|\\.)+>/, false)) {
 526        state.f = state.inline = linkInline;
 527        if (modeCfg.highlightFormatting) state.formatting = "link";
 528        var type = getType(state);
 529        if (type){
 530          type += " ";
 531        } else {
 532          type = "";
 533        }
 534        return type + tokenTypes.linkInline;
 535      }
 536  
 537      if (ch === '<' && stream.match(/^[^> \\]+@(?:[^\\>]|\\.)+>/, false)) {
 538        state.f = state.inline = linkInline;
 539        if (modeCfg.highlightFormatting) state.formatting = "link";
 540        var type = getType(state);
 541        if (type){
 542          type += " ";
 543        } else {
 544          type = "";
 545        }
 546        return type + tokenTypes.linkEmail;
 547      }
 548  
 549      if (modeCfg.xml && ch === '<' && stream.match(/^(!--|\?|!\[CDATA\[|[a-z][a-z0-9-]*(?:\s+[a-z_:.\-]+(?:\s*=\s*[^>]+)?)*\s*(?:>|$))/i, false)) {
 550        var end = stream.string.indexOf(">", stream.pos);
 551        if (end != -1) {
 552          var atts = stream.string.substring(stream.start, end);
 553          if (/markdown\s*=\s*('|"){0,1}1('|"){0,1}/.test(atts)) state.md_inside = true;
 554        }
 555        stream.backUp(1);
 556        state.htmlState = CodeMirror.startState(htmlMode);
 557        return switchBlock(stream, state, htmlBlock);
 558      }
 559  
 560      if (modeCfg.xml && ch === '<' && stream.match(/^\/\w*?>/)) {
 561        state.md_inside = false;
 562        return "tag";
 563      } else if (ch === "*" || ch === "_") {
 564        var len = 1, before = stream.pos == 1 ? " " : stream.string.charAt(stream.pos - 2)
 565        while (len < 3 && stream.eat(ch)) len++
 566        var after = stream.peek() || " "
 567        // See http://spec.commonmark.org/0.27/#emphasis-and-strong-emphasis
 568        var leftFlanking = !/\s/.test(after) && (!punctuation.test(after) || /\s/.test(before) || punctuation.test(before))
 569        var rightFlanking = !/\s/.test(before) && (!punctuation.test(before) || /\s/.test(after) || punctuation.test(after))
 570        var setEm = null, setStrong = null
 571        if (len % 2) { // Em
 572          if (!state.em && leftFlanking && (ch === "*" || !rightFlanking || punctuation.test(before)))
 573            setEm = true
 574          else if (state.em == ch && rightFlanking && (ch === "*" || !leftFlanking || punctuation.test(after)))
 575            setEm = false
 576        }
 577        if (len > 1) { // Strong
 578          if (!state.strong && leftFlanking && (ch === "*" || !rightFlanking || punctuation.test(before)))
 579            setStrong = true
 580          else if (state.strong == ch && rightFlanking && (ch === "*" || !leftFlanking || punctuation.test(after)))
 581            setStrong = false
 582        }
 583        if (setStrong != null || setEm != null) {
 584          if (modeCfg.highlightFormatting) state.formatting = setEm == null ? "strong" : setStrong == null ? "em" : "strong em"
 585          if (setEm === true) state.em = ch
 586          if (setStrong === true) state.strong = ch
 587          var t = getType(state)
 588          if (setEm === false) state.em = false
 589          if (setStrong === false) state.strong = false
 590          return t
 591        }
 592      } else if (ch === ' ') {
 593        if (stream.eat('*') || stream.eat('_')) { // Probably surrounded by spaces
 594          if (stream.peek() === ' ') { // Surrounded by spaces, ignore
 595            return getType(state);
 596          } else { // Not surrounded by spaces, back up pointer
 597            stream.backUp(1);
 598          }
 599        }
 600      }
 601  
 602      if (modeCfg.strikethrough) {
 603        if (ch === '~' && stream.eatWhile(ch)) {
 604          if (state.strikethrough) {// Remove strikethrough
 605            if (modeCfg.highlightFormatting) state.formatting = "strikethrough";
 606            var t = getType(state);
 607            state.strikethrough = false;
 608            return t;
 609          } else if (stream.match(/^[^\s]/, false)) {// Add strikethrough
 610            state.strikethrough = true;
 611            if (modeCfg.highlightFormatting) state.formatting = "strikethrough";
 612            return getType(state);
 613          }
 614        } else if (ch === ' ') {
 615          if (stream.match('~~', true)) { // Probably surrounded by space
 616            if (stream.peek() === ' ') { // Surrounded by spaces, ignore
 617              return getType(state);
 618            } else { // Not surrounded by spaces, back up pointer
 619              stream.backUp(2);
 620            }
 621          }
 622        }
 623      }
 624  
 625      if (modeCfg.emoji && ch === ":" && stream.match(/^(?:[a-z_\d+][a-z_\d+-]*|\-[a-z_\d+][a-z_\d+-]*):/)) {
 626        state.emoji = true;
 627        if (modeCfg.highlightFormatting) state.formatting = "emoji";
 628        var retType = getType(state);
 629        state.emoji = false;
 630        return retType;
 631      }
 632  
 633      if (ch === ' ') {
 634        if (stream.match(/^ +$/, false)) {
 635          state.trailingSpace++;
 636        } else if (state.trailingSpace) {
 637          state.trailingSpaceNewLine = true;
 638        }
 639      }
 640  
 641      return getType(state);
 642    }
 643  
 644    function linkInline(stream, state) {
 645      var ch = stream.next();
 646  
 647      if (ch === ">") {
 648        state.f = state.inline = inlineNormal;
 649        if (modeCfg.highlightFormatting) state.formatting = "link";
 650        var type = getType(state);
 651        if (type){
 652          type += " ";
 653        } else {
 654          type = "";
 655        }
 656        return type + tokenTypes.linkInline;
 657      }
 658  
 659      stream.match(/^[^>]+/, true);
 660  
 661      return tokenTypes.linkInline;
 662    }
 663  
 664    function linkHref(stream, state) {
 665      // Check if space, and return NULL if so (to avoid marking the space)
 666      if(stream.eatSpace()){
 667        return null;
 668      }
 669      var ch = stream.next();
 670      if (ch === '(' || ch === '[') {
 671        state.f = state.inline = getLinkHrefInside(ch === "(" ? ")" : "]");
 672        if (modeCfg.highlightFormatting) state.formatting = "link-string";
 673        state.linkHref = true;
 674        return getType(state);
 675      }
 676      return 'error';
 677    }
 678  
 679    var linkRE = {
 680      ")": /^(?:[^\\\(\)]|\\.|\((?:[^\\\(\)]|\\.)*\))*?(?=\))/,
 681      "]": /^(?:[^\\\[\]]|\\.|\[(?:[^\\\[\]]|\\.)*\])*?(?=\])/
 682    }
 683  
 684    function getLinkHrefInside(endChar) {
 685      return function(stream, state) {
 686        var ch = stream.next();
 687  
 688        if (ch === endChar) {
 689          state.f = state.inline = inlineNormal;
 690          if (modeCfg.highlightFormatting) state.formatting = "link-string";
 691          var returnState = getType(state);
 692          state.linkHref = false;
 693          return returnState;
 694        }
 695  
 696        stream.match(linkRE[endChar])
 697        state.linkHref = true;
 698        return getType(state);
 699      };
 700    }
 701  
 702    function footnoteLink(stream, state) {
 703      if (stream.match(/^([^\]\\]|\\.)*\]:/, false)) {
 704        state.f = footnoteLinkInside;
 705        stream.next(); // Consume [
 706        if (modeCfg.highlightFormatting) state.formatting = "link";
 707        state.linkText = true;
 708        return getType(state);
 709      }
 710      return switchInline(stream, state, inlineNormal);
 711    }
 712  
 713    function footnoteLinkInside(stream, state) {
 714      if (stream.match(']:', true)) {
 715        state.f = state.inline = footnoteUrl;
 716        if (modeCfg.highlightFormatting) state.formatting = "link";
 717        var returnType = getType(state);
 718        state.linkText = false;
 719        return returnType;
 720      }
 721  
 722      stream.match(/^([^\]\\]|\\.)+/, true);
 723  
 724      return tokenTypes.linkText;
 725    }
 726  
 727    function footnoteUrl(stream, state) {
 728      // Check if space, and return NULL if so (to avoid marking the space)
 729      if(stream.eatSpace()){
 730        return null;
 731      }
 732      // Match URL
 733      stream.match(/^[^\s]+/, true);
 734      // Check for link title
 735      if (stream.peek() === undefined) { // End of line, set flag to check next line
 736        state.linkTitle = true;
 737      } else { // More content on line, check if link title
 738        stream.match(/^(?:\s+(?:"(?:[^"\\]|\\.)+"|'(?:[^'\\]|\\.)+'|\((?:[^)\\]|\\.)+\)))?/, true);
 739      }
 740      state.f = state.inline = inlineNormal;
 741      return tokenTypes.linkHref + " url";
 742    }
 743  
 744    var mode = {
 745      startState: function() {
 746        return {
 747          f: blockNormal,
 748  
 749          prevLine: {stream: null},
 750          thisLine: {stream: null},
 751  
 752          block: blockNormal,
 753          htmlState: null,
 754          indentation: 0,
 755  
 756          inline: inlineNormal,
 757          text: handleText,
 758  
 759          formatting: false,
 760          linkText: false,
 761          linkHref: false,
 762          linkTitle: false,
 763          code: 0,
 764          em: false,
 765          strong: false,
 766          header: 0,
 767          setext: 0,
 768          hr: false,
 769          taskList: false,
 770          list: false,
 771          listStack: [],
 772          quote: 0,
 773          trailingSpace: 0,
 774          trailingSpaceNewLine: false,
 775          strikethrough: false,
 776          emoji: false,
 777          fencedEndRE: null
 778        };
 779      },
 780  
 781      copyState: function(s) {
 782        return {
 783          f: s.f,
 784  
 785          prevLine: s.prevLine,
 786          thisLine: s.thisLine,
 787  
 788          block: s.block,
 789          htmlState: s.htmlState && CodeMirror.copyState(htmlMode, s.htmlState),
 790          indentation: s.indentation,
 791  
 792          localMode: s.localMode,
 793          localState: s.localMode ? CodeMirror.copyState(s.localMode, s.localState) : null,
 794  
 795          inline: s.inline,
 796          text: s.text,
 797          formatting: false,
 798          linkText: s.linkText,
 799          linkTitle: s.linkTitle,
 800          linkHref: s.linkHref,
 801          code: s.code,
 802          em: s.em,
 803          strong: s.strong,
 804          strikethrough: s.strikethrough,
 805          emoji: s.emoji,
 806          header: s.header,
 807          setext: s.setext,
 808          hr: s.hr,
 809          taskList: s.taskList,
 810          list: s.list,
 811          listStack: s.listStack.slice(0),
 812          quote: s.quote,
 813          indentedCode: s.indentedCode,
 814          trailingSpace: s.trailingSpace,
 815          trailingSpaceNewLine: s.trailingSpaceNewLine,
 816          md_inside: s.md_inside,
 817          fencedEndRE: s.fencedEndRE
 818        };
 819      },
 820  
 821      token: function(stream, state) {
 822  
 823        // Reset state.formatting
 824        state.formatting = false;
 825  
 826        if (stream != state.thisLine.stream) {
 827          state.header = 0;
 828          state.hr = false;
 829  
 830          if (stream.match(/^\s*$/, true)) {
 831            blankLine(state);
 832            return null;
 833          }
 834  
 835          state.prevLine = state.thisLine
 836          state.thisLine = {stream: stream}
 837  
 838          // Reset state.taskList
 839          state.taskList = false;
 840  
 841          // Reset state.trailingSpace
 842          state.trailingSpace = 0;
 843          state.trailingSpaceNewLine = false;
 844  
 845          if (!state.localState) {
 846            state.f = state.block;
 847            if (state.f != htmlBlock) {
 848              var indentation = stream.match(/^\s*/, true)[0].replace(/\t/g, expandedTab).length;
 849              state.indentation = indentation;
 850              state.indentationDiff = null;
 851              if (indentation > 0) return null;
 852            }
 853          }
 854        }
 855        return state.f(stream, state);
 856      },
 857  
 858      innerMode: function(state) {
 859        if (state.block == htmlBlock) return {state: state.htmlState, mode: htmlMode};
 860        if (state.localState) return {state: state.localState, mode: state.localMode};
 861        return {state: state, mode: mode};
 862      },
 863  
 864      indent: function(state, textAfter, line) {
 865        if (state.block == htmlBlock && htmlMode.indent) return htmlMode.indent(state.htmlState, textAfter, line)
 866        if (state.localState && state.localMode.indent) return state.localMode.indent(state.localState, textAfter, line)
 867        return CodeMirror.Pass
 868      },
 869  
 870      blankLine: blankLine,
 871  
 872      getType: getType,
 873  
 874      blockCommentStart: "<!--",
 875      blockCommentEnd: "-->",
 876      closeBrackets: "()[]{}''\"\"``",
 877      fold: "markdown"
 878    };
 879    return mode;
 880  }, "xml");
 881  
 882  CodeMirror.defineMIME("text/markdown", "markdown");
 883  
 884  CodeMirror.defineMIME("text/x-markdown", "markdown");
 885  
 886  });