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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"));
   7    else if (typeof define == "function" && define.amd) // AMD
   8      define(["../../lib/codemirror"], mod);
   9    else // Plain browser env
  10      mod(CodeMirror);
  11  })(function(CodeMirror) {
  12    var defaults = {
  13      pairs: "()[]{}''\"\"",
  14      closeBefore: ")]}'\":;>",
  15      triples: "",
  16      explode: "[]{}"
  17    };
  18  
  19    var Pos = CodeMirror.Pos;
  20  
  21    CodeMirror.defineOption("autoCloseBrackets", false, function(cm, val, old) {
  22      if (old && old != CodeMirror.Init) {
  23        cm.removeKeyMap(keyMap);
  24        cm.state.closeBrackets = null;
  25      }
  26      if (val) {
  27        ensureBound(getOption(val, "pairs"))
  28        cm.state.closeBrackets = val;
  29        cm.addKeyMap(keyMap);
  30      }
  31    });
  32  
  33    function getOption(conf, name) {
  34      if (name == "pairs" && typeof conf == "string") return conf;
  35      if (typeof conf == "object" && conf[name] != null) return conf[name];
  36      return defaults[name];
  37    }
  38  
  39    var keyMap = {Backspace: handleBackspace, Enter: handleEnter};
  40    function ensureBound(chars) {
  41      for (var i = 0; i < chars.length; i++) {
  42        var ch = chars.charAt(i), key = "'" + ch + "'"
  43        if (!keyMap[key]) keyMap[key] = handler(ch)
  44      }
  45    }
  46    ensureBound(defaults.pairs + "`")
  47  
  48    function handler(ch) {
  49      return function(cm) { return handleChar(cm, ch); };
  50    }
  51  
  52    function getConfig(cm) {
  53      var deflt = cm.state.closeBrackets;
  54      if (!deflt || deflt.override) return deflt;
  55      var mode = cm.getModeAt(cm.getCursor());
  56      return mode.closeBrackets || deflt;
  57    }
  58  
  59    function handleBackspace(cm) {
  60      var conf = getConfig(cm);
  61      if (!conf || cm.getOption("disableInput")) return CodeMirror.Pass;
  62  
  63      var pairs = getOption(conf, "pairs");
  64      var ranges = cm.listSelections();
  65      for (var i = 0; i < ranges.length; i++) {
  66        if (!ranges[i].empty()) return CodeMirror.Pass;
  67        var around = charsAround(cm, ranges[i].head);
  68        if (!around || pairs.indexOf(around) % 2 != 0) return CodeMirror.Pass;
  69      }
  70      for (var i = ranges.length - 1; i >= 0; i--) {
  71        var cur = ranges[i].head;
  72        cm.replaceRange("", Pos(cur.line, cur.ch - 1), Pos(cur.line, cur.ch + 1), "+delete");
  73      }
  74    }
  75  
  76    function handleEnter(cm) {
  77      var conf = getConfig(cm);
  78      var explode = conf && getOption(conf, "explode");
  79      if (!explode || cm.getOption("disableInput")) return CodeMirror.Pass;
  80  
  81      var ranges = cm.listSelections();
  82      for (var i = 0; i < ranges.length; i++) {
  83        if (!ranges[i].empty()) return CodeMirror.Pass;
  84        var around = charsAround(cm, ranges[i].head);
  85        if (!around || explode.indexOf(around) % 2 != 0) return CodeMirror.Pass;
  86      }
  87      cm.operation(function() {
  88        var linesep = cm.lineSeparator() || "\n";
  89        cm.replaceSelection(linesep + linesep, null);
  90        moveSel(cm, -1)
  91        ranges = cm.listSelections();
  92        for (var i = 0; i < ranges.length; i++) {
  93          var line = ranges[i].head.line;
  94          cm.indentLine(line, null, true);
  95          cm.indentLine(line + 1, null, true);
  96        }
  97      });
  98    }
  99  
 100    function moveSel(cm, dir) {
 101      var newRanges = [], ranges = cm.listSelections(), primary = 0
 102      for (var i = 0; i < ranges.length; i++) {
 103        var range = ranges[i]
 104        if (range.head == cm.getCursor()) primary = i
 105        var pos = range.head.ch || dir > 0 ? {line: range.head.line, ch: range.head.ch + dir} : {line: range.head.line - 1}
 106        newRanges.push({anchor: pos, head: pos})
 107      }
 108      cm.setSelections(newRanges, primary)
 109    }
 110  
 111    function contractSelection(sel) {
 112      var inverted = CodeMirror.cmpPos(sel.anchor, sel.head) > 0;
 113      return {anchor: new Pos(sel.anchor.line, sel.anchor.ch + (inverted ? -1 : 1)),
 114              head: new Pos(sel.head.line, sel.head.ch + (inverted ? 1 : -1))};
 115    }
 116  
 117    function handleChar(cm, ch) {
 118      var conf = getConfig(cm);
 119      if (!conf || cm.getOption("disableInput")) return CodeMirror.Pass;
 120  
 121      var pairs = getOption(conf, "pairs");
 122      var pos = pairs.indexOf(ch);
 123      if (pos == -1) return CodeMirror.Pass;
 124  
 125      var closeBefore = getOption(conf,"closeBefore");
 126  
 127      var triples = getOption(conf, "triples");
 128  
 129      var identical = pairs.charAt(pos + 1) == ch;
 130      var ranges = cm.listSelections();
 131      var opening = pos % 2 == 0;
 132  
 133      var type;
 134      for (var i = 0; i < ranges.length; i++) {
 135        var range = ranges[i], cur = range.head, curType;
 136        var next = cm.getRange(cur, Pos(cur.line, cur.ch + 1));
 137        if (opening && !range.empty()) {
 138          curType = "surround";
 139        } else if ((identical || !opening) && next == ch) {
 140          if (identical && stringStartsAfter(cm, cur))
 141            curType = "both";
 142          else if (triples.indexOf(ch) >= 0 && cm.getRange(cur, Pos(cur.line, cur.ch + 3)) == ch + ch + ch)
 143            curType = "skipThree";
 144          else
 145            curType = "skip";
 146        } else if (identical && cur.ch > 1 && triples.indexOf(ch) >= 0 &&
 147                   cm.getRange(Pos(cur.line, cur.ch - 2), cur) == ch + ch) {
 148          if (cur.ch > 2 && /\bstring/.test(cm.getTokenTypeAt(Pos(cur.line, cur.ch - 2)))) return CodeMirror.Pass;
 149          curType = "addFour";
 150        } else if (identical) {
 151          var prev = cur.ch == 0 ? " " : cm.getRange(Pos(cur.line, cur.ch - 1), cur)
 152          if (!CodeMirror.isWordChar(next) && prev != ch && !CodeMirror.isWordChar(prev)) curType = "both";
 153          else return CodeMirror.Pass;
 154        } else if (opening && (next.length === 0 || /\s/.test(next) || closeBefore.indexOf(next) > -1)) {
 155          curType = "both";
 156        } else {
 157          return CodeMirror.Pass;
 158        }
 159        if (!type) type = curType;
 160        else if (type != curType) return CodeMirror.Pass;
 161      }
 162  
 163      var left = pos % 2 ? pairs.charAt(pos - 1) : ch;
 164      var right = pos % 2 ? ch : pairs.charAt(pos + 1);
 165      cm.operation(function() {
 166        if (type == "skip") {
 167          moveSel(cm, 1)
 168        } else if (type == "skipThree") {
 169          moveSel(cm, 3)
 170        } else if (type == "surround") {
 171          var sels = cm.getSelections();
 172          for (var i = 0; i < sels.length; i++)
 173            sels[i] = left + sels[i] + right;
 174          cm.replaceSelections(sels, "around");
 175          sels = cm.listSelections().slice();
 176          for (var i = 0; i < sels.length; i++)
 177            sels[i] = contractSelection(sels[i]);
 178          cm.setSelections(sels);
 179        } else if (type == "both") {
 180          cm.replaceSelection(left + right, null);
 181          cm.triggerElectric(left + right);
 182          moveSel(cm, -1)
 183        } else if (type == "addFour") {
 184          cm.replaceSelection(left + left + left + left, "before");
 185          moveSel(cm, 1)
 186        }
 187      });
 188    }
 189  
 190    function charsAround(cm, pos) {
 191      var str = cm.getRange(Pos(pos.line, pos.ch - 1),
 192                            Pos(pos.line, pos.ch + 1));
 193      return str.length == 2 ? str : null;
 194    }
 195  
 196    function stringStartsAfter(cm, pos) {
 197      var token = cm.getTokenAt(Pos(pos.line, pos.ch + 1))
 198      return /\bstring/.test(token.type) && token.start == pos.ch &&
 199        (pos.ch == 0 || !/\bstring/.test(cm.getTokenTypeAt(pos)))
 200    }
 201  });