text: (function() {
    var DEFAULT_BRACKETS = "()[]{}''\"\"";
    var DEFAULT_EXPLODE_ON_ENTER = "[]{}";
    var SPACE_CHAR_REGEX = /\s/;
  
    CodeMirror.defineOption("autoCloseBrackets", false, function(cm, val, old) {
      if (old != CodeMirror.Init && old)
        cm.removeKeyMap("autoCloseBrackets");
      if (!val) return;
      var pairs = DEFAULT_BRACKETS, explode = DEFAULT_EXPLODE_ON_ENTER;
      if (typeof val == "string") pairs = val;
      else if (typeof val == "object") {
        if (val.pairs != null) pairs = val.pairs;
        if (val.explode != null) explode = val.explode;
      }
      var map = buildKeymap(pairs);
      if (explode) map.Enter = buildExplodeHandler(explode);
      cm.addKeyMap(map);
    });
  
    function charsAround(cm, pos) {
      var str = cm.getRange(CodeMirror.Pos(pos.line, pos.ch - 1),
                            CodeMirror.Pos(pos.line, pos.ch + 1));
      return str.length == 2 ? str : null;
    }
  
    function buildKeymap(pairs) {
      var map = {
        name : "autoCloseBrackets",
        Backspace: function(cm) {
          if (cm.somethingSelected()) return CodeMirror.Pass;
          var cur = cm.getCursor(), around = charsAround(cm, cur);
          if (around && pairs.indexOf(around) % 2 == 0)
            cm.replaceRange("", CodeMirror.Pos(cur.line, cur.ch - 1), CodeMirror.Pos(cur.line, cur.ch + 1));
          else
            return CodeMirror.Pass;
        }
      };
      var closingBrackets = "";
      for (var i = 0; i < pairs.length; i += 2) (function(left, right) {
        if (left != right) closingBrackets += right;
        function surround(cm) {
          var selection = cm.getSelection();
          cm.replaceSelection(left + selection + right);
        }
        function maybeOverwrite(cm) {
          var cur = cm.getCursor(), ahead = cm.getRange(cur, CodeMirror.Pos(cur.line, cur.ch + 1));
          if (ahead != right || cm.somethingSelected()) return CodeMirror.Pass;
          else cm.execCommand("goCharRight");
        }
        map["'" + left + "'"] = function(cm) {
          if (left == "'" && cm.getTokenAt(cm.getCursor()).type == "comment")
            return CodeMirror.Pass;
          if (cm.somethingSelected()) return surround(cm);
          if (left == right && maybeOverwrite(cm) != CodeMirror.Pass) return;
          var cur = cm.getCursor(), ahead = CodeMirror.Pos(cur.line, cur.ch + 1);
          var line = cm.getLine(cur.line), nextChar = line.charAt(cur.ch), curChar = cur.ch > 0 ? line.charAt(cur.ch - 1) : "";
          if (left == right && CodeMirror.isWordChar(curChar))
            return CodeMirror.Pass;
          if (line.length == cur.ch || closingBrackets.indexOf(nextChar) >= 0 || SPACE_CHAR_REGEX.test(nextChar))
            cm.replaceSelection(left + right, {head: ahead, anchor: ahead});
          else
            return CodeMirror.Pass;
        };
        if (left != right) map["'" + right + "'"] = maybeOverwrite;
      })(pairs.charAt(i), pairs.charAt(i + 1));
      return map;
    }
  
    function buildExplodeHandler(pairs) {
      return function(cm) {
        var cur = cm.getCursor(), around = charsAround(cm, cur);
        if (!around || pairs.indexOf(around) % 2 != 0) return CodeMirror.Pass;
        cm.operation(function() {
          var newPos = CodeMirror.Pos(cur.line + 1, 0);
          cm.replaceSelection("\n\n", {anchor: newPos, head: newPos}, "+input");
          cm.indentLine(cur.line + 1, null, true);
          cm.indentLine(cur.line + 2, null, true);
        });
      };
    }
  })();
  