text: // All functions that need access to the editor's state live inside
  // the CodeMirror function. Below that, at the bottom of the file,
  // some utilities are defined.
  
  // CodeMirror is the only global var we claim
  var CodeMirror = (function() {
    // This is the function that produces an editor instance. It's
    // closure is used to store the editor state.
    function CodeMirror(place, givenOptions) {
      // Determine effective options based on given values and defaults.
      var options = {}, defaults = CodeMirror.defaults;
      for (var opt in defaults)
        if (defaults.hasOwnProperty(opt))
          options[opt] = (givenOptions && givenOptions.hasOwnProperty(opt) ? givenOptions : defaults)[opt];
  
      var targetDocument = options["document"];
      // The element in which the editor lives. Takes care of scrolling
      // (if enabled).
      var wrapper = targetDocument.createElement("div");
      wrapper.className = "CodeMirror";
      // Work around http://www.quirksmode.org/bugreports/archives/2006/09/Overflow_Hidden_not_hiding.html
      if (window.ActiveXObject && /MSIE [1-7]\b/.test(navigator.userAgent))
        wrapper.style.position = "relative";
      // This mess creates the base DOM structure for the editor.
      wrapper.innerHTML =
        '<div style="position: relative">' + // Set to the height of the text, causes scrolling
          '<div style="position: absolute; height: 0; width: 0; overflow: hidden;"></div>' +
          '<div style="position: relative">' + // Moved around its parent to cover visible view
            '<div class="CodeMirror-gutter"><div class="CodeMirror-gutter-text"></div></div>' +
            '<div style="overflow: hidden; position: absolute; width: 1px; height: 0; left: 0">' + // Wraps and hides input textarea
              '<textarea style="position: absolute; width: 100000px;" wrap="off"></textarea></div>' +
            // Provides positioning relative to (visible) text origin
            '<div class="CodeMirror-lines"><div style="position: relative">' +
              '<pre class="CodeMirror-cursor">&#160;</pre>' + // Absolutely positioned blinky cursor
              '<div></div></div></div></div></div>'; // This DIV contains the actual code
      if (place.appendChild) place.appendChild(wrapper); else place(wrapper);
      // I've never seen more elegant code in my life.
      var code = wrapper.firstChild, measure = code.firstChild, mover = measure.nextSibling,
          gutter = mover.firstChild, gutterText = gutter.firstChild,
          inputDiv = gutter.nextSibling, input = inputDiv.firstChild,
          lineSpace = inputDiv.nextSibling.firstChild, cursor = lineSpace.firstChild, lineDiv = cursor.nextSibling;
      if (options.tabindex != null) input.tabindex = options.tabindex;
      if (!options.gutter && !options.lineNumbers) gutter.style.display = "none";
  
      // Delayed object wrap timeouts, making sure only one is active. blinker holds an interval.
      var poll = new Delayed(), highlight = new Delayed(), blinker;
  
      // mode holds a mode API object. lines an array of Line objects
      // (see Line constructor), work an array of lines that should be
      // parsed, and history the undo history (instance of History
      // constructor).
      var mode, lines = [new Line("")], work, history = new History(), focused;
      loadMode();
      // The selection. These are always maintained to point at valid
      // positions. Inverted is used to remember that the user is
      // selecting bottom-to-top.
      var sel = {from: {line: 0, ch: 0}, to: {line: 0, ch: 0}, inverted: false};
      // Selection-related flags. shiftSelecting obviously tracks
      // whether the user is holding shift. reducedSelection is a hack
      // to get around the fact that we can't create inverted
      // selections. See below.
      var shiftSelecting, reducedSelection, lastDoubleClick;
      // Variables used by startOperation/endOperation to track what
      // happened during the operation.
      var updateInput, changes, textChanged, selectionChanged, leaveInputAlone;
      // Current visible range (may be bigger than the view window).
      var showingFrom = 0, showingTo = 0, lastHeight = 0, curKeyId = null;
      // editing will hold an object describing the things we put in the
      // textarea, to help figure out whether something changed.
      // bracketHighlighted is used to remember that a backet has been
      // marked.
      var editing, bracketHighlighted;
      // Tracks the maximum line length so that the horizontal scrollbar
      // can be kept static when scrolling.
      var maxLine = "";
  
      // Initialize the content. Somewhat hacky (delayed prepareInput)
      // to work around browser issues.
      operation(function(){setValue(options.value || ""); updateInput = false;})();
      setTimeout(prepareInput, 20);
  
      // Register our event handlers.
      connect(wrapper, "mousedown", operation(onMouseDown));
      // Gecko browsers fire contextmenu *after* opening the menu, at
      // which point we can't mess with it anymore. Context menu is
      // handled in onMouseDown for Gecko.
      if (!gecko) connect(wrapper, "contextmenu", operation(onContextMenu));
      connect(code, "dblclick", operation(onDblClick));
      connect(wrapper, "scroll", function() {updateDisplay([]); if (options.onScroll) options.onScroll(instance);});
      connect(window, "resize", function() {updateDisplay(true);});
      connect(input, "keyup", operation(onKeyUp));
      connect(input, "keydown", operation(onKeyDown));
      connect(input, "keypress", operation(onKeyPress));
      connect(input, "focus", onFocus);
      connect(input, "blur", onBlur);
  
      connect(wrapper, "dragenter", function(e){e.stop();});
      connect(wrapper, "dragover", function(e){e.stop();});
      connect(wrapper, "drop", operation(onDrop));
      connect(wrapper, "paste", function(){input.focus(); fastPoll();});
      connect(input, "paste", function(){fastPoll();});
      connect(input, "cut", function(){fastPoll();});
  
      if (targetDocument.activeElement == input) onFocus();
      else onBlur();
  
      function isLine(l) {return l >= 0 && l < lines.length;}
      // The instance object that we'll return. Mostly calls out to
      // local functions in the CodeMirror function. Some do some extra
      // range checking and/or clipping. operation is used to wrap the
      // call so that changes it makes are tracked, and the display is
      // updated afterwards.
      var instance = {
        getValue: getValue,
        setValue: operation(setValue),
        getSelection: getSelection,
        replaceSelection: operation(replaceSelection),
        focus: function(){input.focus(); onFocus(); fastPoll();},
        setOption: function(option, value) {
          options[option] = value;
          if (option == "lineNumbers" || option == "gutter") gutterChanged();
          else if (option == "mode" || option == "indentUnit") loadMode();
        },
        getOption: function(option) {return options[option];},
        undo: operation(undo),
        redo: operation(redo),
        indentLine: operation(function(n) {if (isLine(n)) indentLine(n, "smart");}),
        historySize: function() {return {undo: history.done.length, redo: history.undone.length};},
        matchBrackets: operation(function(){matchBrackets(true);}),
        getTokenAt: function(pos) {
          pos = clipPos(pos);
          return lines[pos.line].getTokenAt(mode, getStateBefore(pos.line), pos.ch);
        },
        cursorCoords: function(start){
          if (start == null) start = sel.inverted;
          return pageCoords(start ? sel.from : sel.to);
        },
        charCoords: function(pos){return pageCoords(clipPos(pos));},
        coordsChar: function(coords) {
          var off = eltOffset(lineSpace);
          var line = clipLine(Math.min(lines.length - 1, showingFrom + Math.floor((coords.y - off.top) / lineHeight())));
          return clipPos({line: line, ch: charFromX(clipLine(line), coords.x - off.left)});
        },
        getSearchCursor: function(query, pos, caseFold) {return new SearchCursor(query, pos, caseFold);},
        markText: operation(function(a, b, c){return operation(markText(a, b, c));}),
        setMarker: addGutterMarker,
        clearMarker: removeGutterMarker,
        setLineClass: operation(setLineClass),
        lineInfo: lineInfo,
        addWidget: function(pos, node, scroll) {
          var pos = localCoords(clipPos(pos), true);
          node.style.top = (showingFrom * lineHeight() + pos.yBot + paddingTop()) + "px";
          node.style.left = (pos.x + paddingLeft()) + "px";
          code.appendChild(node);
          if (scroll)
            scrollIntoView(pos.x, pos.yBot, pos.x + node.offsetWidth, pos.yBot + node.offsetHeight);
        },
  
        lineCount: function() {return lines.length;},
        getCursor: function(start) {
          if (start == null) start = sel.inverted;
          return copyPos(start ? sel.from : sel.to);
        },
        somethingSelected: function() {return !posEq(sel.from, sel.to);},
        setCursor: operation(function(line, ch) {
          if (ch == null && typeof line.line == "number") setCursor(line.line, line.ch);
          else setCursor(line, ch);
        }),
        setSelection: operation(function(from, to) {setSelection(clipPos(from), clipPos(to || from));}),
        getLine: function(line) {if (isLine(line)) return lines[line].text;},
        setLine: operation(function(line, text) {
          if (isLine(line)) replaceRange(text, {line: line, ch: 0}, {line: line, ch: lines[line].text.length});
        }),
        removeLine: operation(function(line) {
          if (isLine(line)) replaceRange("", {line: line, ch: 0}, clipPos({line: line+1, ch: 0}));
        }),
        replaceRange: operation(replaceRange),
        getRange: function(from, to) {return getRange(clipPos(from), clipPos(to));},
  
        operation: function(f){return operation(f)();},
        refresh: function(){updateDisplay(true);},
        getInputField: function(){return input;},
        getWrapperElement: function(){return wrapper;}
      };
  
      function setValue(code) {
        history = null;
        var top = {line: 0, ch: 0};
        updateLines(top, {line: lines.length - 1, ch: lines[lines.length-1].text.length},
                    splitLines(code), top, top);
        history = new History();
      }
      function getValue(code) {
        var text = [];
        for (var i = 0, l = lines.length; i < l; ++i)
          text.push(lines[i].text);
        return text.join("\n");
      }
  
      function onMouseDown(e) {
        var ld = lastDoubleClick; lastDoubleClick = null;
        // First, see if this is a click in the gutter
        for (var n = e.target(); n != wrapper; n = n.parentNode)
          if (n.parentNode == gutterText) {
            if (options.onGutterClick)
              options.onGutterClick(instance, indexOf(gutterText.childNodes, n) + showingFrom);
            return e.stop();
          }
  
        if (gecko && e.button() == 3) onContextMenu(e);
        if (e.button() != 1) return;
        // For button 1, if it was clicked inside the editor
        // (posFromMouse returning non-null), we have to adjust the
        // selection.
        var start = posFromMouse(e), last = start, going;
        if (!start) {if (e.target() == wrapper) e.stop(); return;}
  
        if (!focused) onFocus();
        e.stop();
        if (ld && +new Date - ld < 400) return selectLine(start.line);
  
        setCursor(start.line, start.ch, true);
        // And then we have to see if it's a drag event, in which case
        // the dragged-over text must be selected.
        function end() {
          input.focus();
          updateInput = true;
          move(); up();
        }
        function extend(e) {
          var cur = posFromMouse(e, true);
          if (cur && !posEq(cur, last)) {
            if (!focused) onFocus();
            last = cur;
            setSelectionUser(start, cur);
            updateInput = false;
            var visible = visibleLines();
            if (cur.line >= visible.to || cur.line < visible.from)
              going = setTimeout(operation(function(){extend(e);}), 150);
          }
        }
  
        var move = connect(targetDocument, "mousemove", operation(function(e) {
          clearTimeout(going);
          e.stop();
          extend(e);
        }), true);
        var up = connect(targetDocument, "mouseup", operation(function(e) {
          clearTimeout(going);
          var cur = posFromMouse(e);
          if (cur) setSelectionUser(start, cur);
          e.stop();
          end();
        }), true);
      }
      function onDblClick(e) {
        var pos = posFromMouse(e);
        if (!pos) return;
        selectWordAt(pos);
        e.stop();
        lastDoubleClick = +new Date;
      }
      function onDrop(e) {
        var pos = posFromMouse(e, true), files = e.e.dataTransfer.files;
        if (!pos || options.readOnly) return;
        if (files && files.length && window.FileReader && window.File) {
          var n = files.length, text = Array(n), read = 0;
          for (var i = 0; i < n; ++i) loadFile(files[i], i);
          function loadFile(file, i) {
            var reader = new FileReader;
            reader.onload = function() {
              text[i] = reader.result;
              if (++read == n) replaceRange(text.join(""), clipPos(pos), clipPos(pos));
            };
            reader.readAsText(file);
          }
        }
        else {
          try {
            var text = e.e.dataTransfer.getData("Text");
            if (text) replaceRange(text, pos, pos);
          }
          catch(e){}
        }
      }
      function onKeyDown(e) {
        if (!focused) onFocus();
  
        var code = e.e.keyCode;
        // Tries to detect ctrl on non-mac, cmd on mac.
        var mod = (mac ? e.e.metaKey : e.e.ctrlKey) && !e.e.altKey, anyMod = e.e.ctrlKey || e.e.altKey || e.e.metaKey;
        if (code == 16 || e.e.shiftKey) shiftSelecting = shiftSelecting || (sel.inverted ? sel.to : sel.from);
        else shiftSelecting = null;
        // First give onKeyEvent option a chance to handle this.
        if (options.onKeyEvent && options.onKeyEvent(instance, addStop(e.e))) return;
  
        if (code == 33 || code == 34) {scrollPage(code == 34); return e.stop();} // page up/down
        if (mod && ((code == 36 || code == 35) || // ctrl-home/end
                    mac && (code == 38 || code == 40))) { // cmd-up/down
          scrollEnd(code == 36 || code == 38); return e.stop();
        }
        if (mod && code == 65) {selectAll(); return e.stop();} // ctrl-a
        if (!options.readOnly) {
          if (!anyMod && code == 13) {return;} // enter
          if (!anyMod && code == 9 && handleTab(e.e.shiftKey)) return e.stop(); // tab
          if (mod && code == 90) {undo(); return e.stop();} // ctrl-z
          if (mod && ((e.e.shiftKey && code == 90) || code == 89)) {redo(); return e.stop();} // ctrl-shift-z, ctrl-y
        }
  
        // Key id to use in the movementKeys map. We also pass it to
        // fastPoll in order to 'self learn'. We need this because
        // reducedSelection, the hack where we collapse the selection to
        // its start when it is inverted and a movement key is pressed
        // (and later restore it again), shouldn't be used for
        // non-movement keys.
        curKeyId = (mod ? "c" : "") + code;
        if (sel.inverted && movementKeys.hasOwnProperty(curKeyId)) {
          var range = selRange(input);
          if (range) {
            reducedSelection = {anchor: range.start};
            setSelRange(input, range.start, range.start);
          }
        }
        fastPoll(curKeyId);
      }
      function onKeyUp(e) {
        if (reducedSelection) {
          reducedSelection = null;
          updateInput = true;
        }
        if (e.e.keyCode == 16) shiftSelecting = null;
      }
      function onKeyPress(e) {
        if (options.onKeyEvent && options.onKeyEvent(instance, addStop(e.e))) return;
        if (options.electricChars && mode.electricChars) {
          var ch = String.fromCharCode(e.e.charCode == null ? e.e.keyCode : e.e.charCode);
          if (mode.electricChars.indexOf(ch) > -1)
            setTimeout(operation(function() {indentLine(sel.to.line, "smart");}), 50);
        }
        var code = e.e.keyCode;
        // Re-stop tab and enter. Necessary on some browsers.
        if (code == 13) {if (!options.readOnly) handleEnter(); e.stop();}
        else if (!e.e.ctrlKey && !e.e.altKey && !e.e.metaKey && code == 9 && options.tabMode != "default") e.stop();
        else fastPoll(curKeyId);
      }
  
      function onFocus() {
        if (!focused && options.onFocus) options.onFocus(instance);
        focused = true;
        slowPoll();
        if (wrapper.className.search(/\bCodeMirror-focused\b/) == -1)
          wrapper.className += " CodeMirror-focused";
        restartBlink();
      }
      function onBlur() {
        if (focused && options.onBlur) options.onBlur(instance);
        clearInterval(blinker);
        shiftSelecting = null;
        focused = false;
        wrapper.className = wrapper.className.replace(" CodeMirror-focused", "");
      }
  
      // Replace the range from from to to by the strings in newText.
      // Afterwards, set the selection to selFrom, selTo.
      function updateLines(from, to, newText, selFrom, selTo) {
        if (history) {
          var old = [];
          for (var i = from.line, e = to.line + 1; i < e; ++i) old.push(lines[i].text);
          history.addChange(from.line, newText.length, old);
          while (history.done.length > options.undoDepth) history.done.shift();
        }
        updateLinesNoUndo(from, to, newText, selFrom, selTo);
      }
      function unredoHelper(from, to) {
        var change = from.pop();
        if (change) {
          var replaced = [], end = change.start + change.added;
          for (var i = change.start; i < end; ++i) replaced.push(lines[i].text);
          to.push({start: change.start, added: change.old.length, old: replaced});
          var pos = clipPos({line: change.start + change.old.length - 1,
                             ch: editEnd(replaced[replaced.length-1], change.old[change.old.length-1])});
          updateLinesNoUndo({line: change.start, ch: 0}, {line: end - 1, ch: lines[end-1].text.length}, change.old, pos, pos);
        }
      }
      function undo() {unredoHelper(history.done, history.undone);}
      function redo() {unredoHelper(history.undone, history.done);}
  
      function updateLinesNoUndo(from, to, newText, selFrom, selTo) {
        var recomputeMaxLength = false, maxLineLength = maxLine.length;
        for (var i = from.line; i < to.line; ++i) {
          if (lines[i].text.length == maxLineLength) {recomputeMaxLength = true; break;}
        }
  
        var nlines = to.line - from.line, firstLine = lines[from.line], lastLine = lines[to.line];
        // First adjust the line structure, taking some care to leave highlighting intact.
        if (firstLine == lastLine) {
          if (newText.length == 1)
            firstLine.replace(from.ch, to.ch, newText[0]);
          else {
            lastLine = firstLine.split(to.ch, newText[newText.length-1]);
            var spliceargs = [from.line + 1, nlines];
            firstLine.replace(from.ch, firstLine.text.length, newText[0]);
            for (var i = 1, e = newText.length - 1; i < e; ++i) spliceargs.push(new Line(newText[i]));
            spliceargs.push(lastLine);
            lines.splice.apply(lines, spliceargs);
          }
        }
        else if (newText.length == 1) {
          firstLine.replace(from.ch, firstLine.text.length, newText[0] + lastLine.text.slice(to.ch));
          lines.splice(from.line + 1, nlines);
        }
        else {
          var spliceargs = [from.line + 1, nlines - 1];
          firstLine.replace(from.ch, firstLine.text.length, newText[0]);
          lastLine.replace(0, to.ch, newText[newText.length-1]);
          for (var i = 1, e = newText.length - 1; i < e; ++i) spliceargs.push(new Line(newText[i]));
          lines.splice.apply(lines, spliceargs);
        }
  
  
        for (var i = from.line, e = i + newText.length; i < e; ++i) {
          var l = lines[i].text;
          if (l.length > maxLineLength) {
            maxLine = l; maxLineLength = l.length;
            recomputeMaxLength = false;
          }
        }
        if (recomputeMaxLength) {
          maxLineLength = 0;
          for (var i = 0, e = lines.length; i < e; ++i) {
            var l = lines[i].text;
            if (l.length > maxLineLength) {
              maxLineLength = l.length; maxLine = l;
            }
          }
        }
  
        // Add these lines to the work array, so that they will be
        // highlighted. Adjust work lines if lines were added/removed.
        var newWork = [], lendiff = newText.length - nlines - 1;
        for (var i = 0, l = work.length; i < l; ++i) {
          var task = work[i];
          if (task < from.line) newWork.push(task);
          else if (task > to.line) newWork.push(task + lendiff);
        }
        if (newText.length) newWork.push(from.line);
        work = newWork;
        startWorker(100);
        // Remember that these lines changed, for updating the display
        changes.push({from: from.line, to: to.line + 1, diff: lendiff});
        textChanged = {from: from, to: to, text: newText};
  
        // Update the selection
        function updateLine(n) {return n <= Math.min(to.line, to.line + lendiff) ? n : n + lendiff;}
        setSelection(selFrom, selTo, updateLine(sel.from.line), updateLine(sel.to.line));
  
        // Make sure the scroll-size div has the correct height.
        code.style.height = (lines.length * lineHeight() + 2 * paddingTop()) + "px";
      }
  
      function replaceRange(code, from, to) {
        from = clipPos(from);
        if (!to) to = from; else to = clipPos(to);
        code = splitLines(code);
        function adjustPos(pos) {
          if (posLess(pos, from)) return pos;
          if (!posLess(to, pos)) return end;
          var line = pos.line + code.length - (to.line - from.line) - 1;
          var ch = pos.ch;
          if (pos.line == to.line)
            ch += code[code.length-1].length - (to.ch - (to.line == from.line ? from.ch : 0));
          return {line: line, ch: ch};
        }
        var end;
        replaceRange1(code, from, to, function(end1) {
          end = end1;
          return {from: adjustPos(sel.from), to: adjustPos(sel.to)};
        });
        return end;
      }
      function replaceSelection(code, collapse) {
        replaceRange1(splitLines(code), sel.from, sel.to, function(end) {
          if (collapse == "end") return {from: end, to: end};
          else if (collapse == "start") return {from: sel.from, to: sel.from};
          else return {from: sel.from, to: end};
        });
      }
      function replaceRange1(code, from, to, computeSel) {
        var endch = code.length == 1 ? code[0].length + from.ch : code[code.length-1].length;
        var newSel = computeSel({line: from.line + code.length - 1, ch: endch});
        updateLines(from, to, code, newSel.from, newSel.to);
      }
  
      function getRange(from, to) {
        var l1 = from.line, l2 = to.line;
        if (l1 == l2) return lines[l1].text.slice(from.ch, to.ch);
        var code = [lines[l1].text.slice(from.ch)];
        for (var i = l1 + 1; i < l2; ++i) code.push(lines[i].text);
        code.push(lines[l2].text.slice(0, to.ch));
        return code.join("\n");
      }
      function getSelection() {
        return getRange(sel.from, sel.to);
      }
  
      var pollingFast = false; // Ensures slowPoll doesn't cancel fastPoll
      function slowPoll() {
        if (pollingFast) return;
        poll.set(2000, function() {
          startOperation();
          readInput();
          if (focused) slowPoll();
          endOperation();
        });
      }
      function fastPoll(keyId) {
        var missed = false;
        pollingFast = true;
        function p() {
          startOperation();
          var changed = readInput();
          if (changed == "moved" && keyId) movementKeys[keyId] = true;
          if (!changed && !missed) {missed = true; poll.set(80, p);}
          else {pollingFast = false; slowPoll();}
          endOperation();
        }
        poll.set(20, p);
      }
  
      // Inspects the textarea, compares its state (content, selection)
      // to the data in the editing variable, and updates the editor
      // content or cursor if something changed.
      function readInput() {
        var changed = false, text = input.value, sr = selRange(input);
        if (!sr) return false;
        var changed = editing.text != text, rs = reducedSelection;
        var moved = changed || sr.start != editing.start || sr.end != (rs ? editing.start : editing.end);
        if (!moved && !rs) return false;
        if (changed) {
          shiftSelecting = reducedSelection = null;
          if (options.readOnly) {updateInput = true; return "changed";}
        }
  
        // Compute selection start and end based on start/end offsets in textarea
        function computeOffset(n, startLine) {
          var pos = 0;
          for (;;) {
            var found = text.indexOf("\n", pos);
            if (found == -1 || (text.charAt(found-1) == "\r" ? found - 1 : found) >= n)
              return {line: startLine, ch: n - pos};
            ++startLine;
            pos = found + 1;
          }
        }
        var from = computeOffset(sr.start, editing.from),
            to = computeOffset(sr.end, editing.from);
        // Here we have to take the reducedSelection hack into account,
        // so that you can, for example, press shift-up at the start of
        // your selection and have the right thing happen.
        if (rs) {
          from = sr.start == rs.anchor ? to : from;
          to = shiftSelecting ? sel.to : sr.start == rs.anchor ? from : to;
          if (!posLess(from, to)) {
            reducedSelection = null;
            sel.inverted = false;
            var tmp = from; from = to; to = tmp;
          }
        }
  
        // In some cases (cursor on same line as before), we don't have
        // to update the textarea content at all.
        if (from.line == to.line && from.line == sel.from.line && from.line == sel.to.line && !shiftSelecting)
          updateInput = false;
  
        // Magic mess to extract precise edited range from the changed
        // string.
        if (changed) {
          var start = 0, end = text.length, len = Math.min(end, editing.text.length);
          var c, line = editing.from, nl = -1;
          while (start < len && (c = text.charAt(start)) == editing.text.charAt(start)) {
            ++start;
            if (c == "\n") {line++; nl = start;}
          }
          var ch = nl > -1 ? start - nl : start, endline = editing.to - 1, edend = editing.text.length;
          for (;;) {
            c = editing.text.charAt(edend);
            if (c == "\n") endline--;
            if (text.charAt(end) != c) {++end; ++edend; break;}
            if (edend <= start || end <= start) break;
            --end; --edend;
          }
          var nl = editing.text.lastIndexOf("\n", edend - 1), endch = nl == -1 ? edend : edend - nl - 1;
          updateLines({line: line, ch: ch}, {line: endline, ch: endch}, splitLines(text.slice(start, end)), from, to);
          if (line != endline || from.line != line) updateInput = true;
        }
        else setSelection(from, to);
  
        editing.text = text; editing.start = sr.start; editing.end = sr.end;
        return changed ? "changed" : moved ? "moved" : false;
      }
  
      // Set the textarea content and selection range to match the
      // editor state.
      function prepareInput() {
        var text = [];
        var from = Math.max(0, sel.from.line - 1), to = Math.min(lines.length, sel.to.line + 2);
        for (var i = from; i < to; ++i) text.push(lines[i].text);
        text = input.value = text.join(lineSep);
        var startch = sel.from.ch, endch = sel.to.ch;
        for (var i = from; i < sel.from.line; ++i)
          startch += lineSep.length + lines[i].text.length;
        for (var i = from; i < sel.to.line; ++i)
          endch += lineSep.length + lines[i].text.length;
        editing = {text: text, from: from, to: to, start: startch, end: endch};
        setSelRange(input, startch, reducedSelection ? startch : endch);
      }
  
      function scrollCursorIntoView() {
        var cursor = localCoords(sel.inverted ? sel.from : sel.to);
        return scrollIntoView(cursor.x, cursor.y, cursor.x, cursor.yBot);
      }
      function scrollIntoView(x1, y1, x2, y2) {
        var pl = paddingLeft(), pt = paddingTop(), lh = lineHeight();
        y1 += pt; y2 += pt; x1 += pl; x2 += pl;
        var screen = wrapper.clientHeight, screentop = wrapper.scrollTop, scrolled = false, result = true;
        if (y1 < screentop) {wrapper.scrollTop = Math.max(0, y1 - 2*lh); scrolled = true;}
        else if (y2 > screentop + screen) {wrapper.scrollTop = y2 + lh - screen; scrolled = true;}
  
        var screenw = wrapper.clientWidth, screenleft = wrapper.scrollLeft;
        if (x1 < screenleft) {wrapper.scrollLeft = Math.max(0, x1 - 10); scrolled = true;}
        else if (x2 > screenw + screenleft) {
          wrapper.scrollLeft = x2 + 10 - screenw;
          scrolled = true;
          if (x2 > code.clientWidth) result = false;
        }
        if (scrolled && options.onScroll) options.onScroll(instance);
        return result;
      }
  
      function visibleLines() {
        var lh = lineHeight(), top = wrapper.scrollTop - paddingTop();
        return {from: Math.min(lines.length, Math.max(0, Math.floor(top / lh))),
                to: Math.min(lines.length, Math.ceil((top + wrapper.clientHeight) / lh))};
      }
      // Uses a set of changes plus the current scroll position to
      // determine which DOM updates have to be made, and makes the
      // updates.
      function updateDisplay(changes) {
        if (!wrapper.clientWidth) {
          showingFrom = showingTo = 0;
          return;
        }
        // First create a range of theoretically intact lines, and punch
        // holes in that using the change info.
        var intact = changes === true ? [] : [{from: showingFrom, to: showingTo, domStart: 0}];
        for (var i = 0, l = changes.length || 0; i < l; ++i) {
          var change = changes[i], intact2 = [], diff = change.diff || 0;
          for (var j = 0, l2 = intact.length; j < l2; ++j) {
            var range = intact[j];
            if (change.to <= range.from)
              intact2.push({from: range.from + diff, to: range.to + diff, domStart: range.domStart});
            else if (range.to <= change.from)
              intact2.push(range);
            else {
              if (change.from > range.from)
                intact2.push({from: range.from, to: change.from, domStart: range.domStart})
              if (change.to < range.to)
                intact2.push({from: change.to + diff, to: range.to + diff,
                              domStart: range.domStart + (change.to - range.from)});
            }
          }
          intact = intact2;
        }
  
        // Then, determine which lines we'd want to see, and which
        // updates have to be made to get there.
        var visible = visibleLines();
        var from = Math.min(showingFrom, Math.max(visible.from - 3, 0)),
            to = Math.min(lines.length, Math.max(showingTo, visible.to + 3)),
            updates = [], domPos = 0, domEnd = showingTo - showingFrom, pos = from, changedLines = 0;
  
        for (var i = 0, l = intact.length; i < l; ++i) {
          var range = intact[i];
          if (range.to <= from) continue;
          if (range.from >= to) break;
          if (range.domStart > domPos || range.from > pos) {
            updates.push({from: pos, to: range.from, domSize: range.domStart - domPos, domStart: domPos});
            changedLines += range.from - pos;
          }
          pos = range.to;
          domPos = range.domStart + (range.to - range.from);
        }
        if (domPos != domEnd || pos != to) {
          changedLines += Math.abs(to - pos);
          updates.push({from: pos, to: to, domSize: domEnd - domPos, domStart: domPos});
        }
  
        if (!updates.length) return;
        lineDiv.style.display = "none";
        // If more than 30% of the screen needs update, just do a full
        // redraw (which is quicker than patching)
        if (changedLines > (visible.to - visible.from) * .3)
          refreshDisplay(from = Math.max(visible.from - 10, 0), to = Math.min(visible.to + 7, lines.length));
        // Otherwise, only update the stuff that needs updating.
        else
          patchDisplay(updates);
        lineDiv.style.display = "";
  
        // Position the mover div to align with the lines it's supposed
        // to be showing (which will cover the visible display)
        var different = from != showingFrom || to != showingTo || lastHeight != wrapper.clientHeight;
        showingFrom = from; showingTo = to;
        mover.style.top = (from * lineHeight()) + "px";
        if (different) {
          lastHeight = wrapper.clientHeight;
          code.style.height = (lines.length * lineHeight() + 2 * paddingTop()) + "px";
          updateGutter();
        }
  
        var textWidth = stringWidth(maxLine);
        lineSpace.style.width = textWidth > wrapper.clientWidth ? textWidth + "px" : "";
  
        // Since this is all rather error prone, it is honoured with the
        // only assertion in the whole file.
        if (lineDiv.childNodes.length != showingTo - showingFrom)
          throw new Error("BAD PATCH! " + JSON.stringify(updates) + " size=" + (showingTo - showingFrom) +
                          " nodes=" + lineDiv.childNodes.length);
        updateCursor();
      }
  
      function refreshDisplay(from, to) {
        var html = [], start = {line: from, ch: 0}, inSel = posLess(sel.from, start) && !posLess(sel.to, start);
        for (var i = from; i < to; ++i) {
          var ch1 = null, ch2 = null;
          if (inSel) {
            ch1 = 0;
            if (sel.to.line == i) {inSel = false; ch2 = sel.to.ch;}
          }
          else if (sel.from.line == i) {
            if (sel.to.line == i) {ch1 = sel.from.ch; ch2 = sel.to.ch;}
            else {inSel = true; ch1 = sel.from.ch;}
          }
          html.push(lines[i].getHTML(ch1, ch2, true));
        }
        lineDiv.innerHTML = html.join("");
      }
      function patchDisplay(updates) {
        // Slightly different algorithm for IE (badInnerHTML), since
        // there .innerHTML on PRE nodes is dumb, and discards
        // whitespace.
        var sfrom = sel.from.line, sto = sel.to.line, off = 0,
            scratch = badInnerHTML && targetDocument.createElement("div");
        for (var i = 0, e = updates.length; i < e; ++i) {
          var rec = updates[i];
          var extra = (rec.to - rec.from) - rec.domSize;
          var nodeAfter = lineDiv.childNodes[rec.domStart + rec.domSize + off] || null;
          if (badInnerHTML)
            for (var j = Math.max(-extra, rec.domSize); j > 0; --j)
              lineDiv.removeChild(nodeAfter ? nodeAfter.previousSibling : lineDiv.lastChild);
          else if (extra) {
            for (var j = Math.max(0, extra); j > 0; --j)
              lineDiv.insertBefore(targetDocument.createElement("pre"), nodeAfter);
            for (var j = Math.max(0, -extra); j > 0; --j)
              lineDiv.removeChild(nodeAfter ? nodeAfter.previousSibling : lineDiv.lastChild);
          }
          var node = lineDiv.childNodes[rec.domStart + off], inSel = sfrom < rec.from && sto >= rec.from;
          for (var j = rec.from; j < rec.to; ++j) {
            var ch1 = null, ch2 = null;
            if (inSel) {
              ch1 = 0;
              if (sto == j) {inSel = false; ch2 = sel.to.ch;}
            }
            else if (sfrom == j) {
              if (sto == j) {ch1 = sel.from.ch; ch2 = sel.to.ch;}
              else {inSel = true; ch1 = sel.from.ch;}
            }
            if (badInnerHTML) {
              scratch.innerHTML = lines[j].getHTML(ch1, ch2, true);
              lineDiv.insertBefore(scratch.firstChild, nodeAfter);
            }
            else {
              node.innerHTML = lines[j].getHTML(ch1, ch2, false);
              node.className = lines[j].className || "";
              node = node.nextSibling;
            }
          }
          off += extra;
        }
      }
  
      function updateGutter() {
        if (!options.gutter && !options.lineNumbers) return;
        var hText = mover.offsetHeight, hEditor = wrapper.clientHeight;
        gutter.style.height = (hText - hEditor < 2 ? hEditor : hText) + "px";
        var html = [];
        for (var i = showingFrom; i < showingTo; ++i) {
          var marker = lines[i].gutterMarker;
          var text = options.lineNumbers ? i + options.firstLineNumber : null;
          if (marker && marker.text)
            text = marker.text.replace("%N%", text != null ? text : "");
          else if (text == null)
            text = "\u00a0";
          html.push((marker && marker.style ? '<pre class="' + marker.style + '">' : "<pre>"), text, "</pre>");
        }
        gutter.style.display = "none";
        gutterText.innerHTML = html.join("");
        var minwidth = String(lines.length).length, firstNode = gutterText.firstChild, val = eltText(firstNode), pad = "";
        while (val.length + pad.length < minwidth) pad += "\u00a0";
        if (pad) firstNode.insertBefore(targetDocument.createTextNode(pad), firstNode.firstChild);
        gutter.style.display = "";
        lineSpace.style.marginLeft = gutter.offsetWidth + "px";
      }
      function updateCursor() {
        var head = sel.inverted ? sel.from : sel.to;
        var x = charX(head.line, head.ch) + "px", y = (head.line - showingFrom) * lineHeight() + "px";
        inputDiv.style.top = y;
        if (posEq(sel.from, sel.to)) {
          cursor.style.top = y; cursor.style.left = x;
          cursor.style.display = "";
        }
        else cursor.style.display = "none";
      }
  
      function setSelectionUser(from, to) {
        var sh = shiftSelecting && clipPos(shiftSelecting);
        if (sh) {
          if (posLess(sh, from)) from = sh;
          else if (posLess(to, sh)) to = sh;
        }
        setSelection(from, to);
      }
      // Update the selection. Last two args are only used by
      // updateLines, since they have to be expressed in the line
      // numbers before the update.
      function setSelection(from, to, oldFrom, oldTo) {
        if (posEq(sel.from, from) && posEq(sel.to, to)) return;
        if (posLess(to, from)) {var tmp = to; to = from; from = tmp;}
  
        var startEq = posEq(sel.to, to), endEq = posEq(sel.from, from);
        if (posEq(from, to)) sel.inverted = false;
        else if (startEq && !endEq) sel.inverted = true;
        else if (endEq && !startEq) sel.inverted = false;
  
        // Some ugly logic used to only mark the lines that actually did
        // see a change in selection as changed, rather than the whole
        // selected range.
        if (oldFrom == null) {oldFrom = sel.from.line; oldTo = sel.to.line;}
        if (posEq(from, to)) {
          if (!posEq(sel.from, sel.to))
            changes.push({from: oldFrom, to: oldTo + 1});
        }
        else if (posEq(sel.from, sel.to)) {
          changes.push({from: from.line, to: to.line + 1});
        }
        else {
          if (!posEq(from, sel.from)) {
            if (from.line < oldFrom)
              changes.push({from: from.line, to: Math.min(to.line, oldFrom) + 1});
            else
              changes.push({from: oldFrom, to: Math.min(oldTo, from.line) + 1});
          }
          if (!posEq(to, sel.to)) {
            if (to.line < oldTo)
              changes.push({from: Math.max(oldFrom, from.line), to: oldTo + 1});
            else
              changes.push({from: Math.max(from.line, oldTo), to: to.line + 1});
          }
        }
        sel.from = from; sel.to = to;
        selectionChanged = true;
      }
      function setCursor(line, ch, user) {
        var pos = clipPos({line: line, ch: ch || 0});
        (user ? setSelectionUser : setSelection)(pos, pos);
      }
  
      function clipLine(n) {return Math.max(0, Math.min(n, lines.length-1));}
      function clipPos(pos) {
        if (pos.line < 0) return {line: 0, ch: 0};
        if (pos.line >= lines.length) return {line: lines.length-1, ch: lines[lines.length-1].text.length};
        var ch = pos.ch, linelen = lines[pos.line].text.length;
        if (ch == null || ch > linelen) return {line: pos.line, ch: linelen};
        else if (ch < 0) return {line: pos.line, ch: 0};
        else return pos;
      }
  
      function scrollPage(down) {
        var linesPerPage = Math.floor(wrapper.clientHeight / lineHeight()), head = sel.inverted ? sel.from : sel.to;
        setCursor(head.line + (Math.max(linesPerPage - 1, 1) * (down ? 1 : -1)), head.ch, true);
      }
      function scrollEnd(top) {
        setCursor(top ? 0 : lines.length - 1, true);
      }
      function selectAll() {
        var endLine = lines.length - 1;
        setSelection({line: 0, ch: 0}, {line: endLine, ch: lines[endLine].text.length});
      }
      function selectWordAt(pos) {
        var line = lines[pos.line].text;
        var start = pos.ch, end = pos.ch;
        while (start > 0 && /\w/.test(line.charAt(start - 1))) --start;
        while (end < line.length && /\w/.test(line.charAt(end))) ++end;
        setSelectionUser({line: pos.line, ch: start}, {line: pos.line, ch: end});
      }
      function selectLine(line) {
        setSelectionUser({line: line, ch: 0}, {line: line, ch: lines[line].text.length});
      }
      function handleEnter() {
        replaceSelection("\n", "end");
        if (options.enterMode != "flat")
          indentLine(sel.from.line, options.enterMode == "keep" ? "prev" : "smart");
      }
      function handleTab(shift) {
        shiftSelecting = null;
        switch (options.tabMode) {
        case "default":
          return false;
        case "indent":
          for (var i = sel.from.line, e = sel.to.line; i <= e; ++i) indentLine(i, "smart");
          break;
        case "classic":
          if (posEq(sel.from, sel.to)) {
            if (shift) indentLine(sel.from.line, "smart");
            else replaceSelection("\t", "end");
            break;
          }
        case "shift":
          for (var i = sel.from.line, e = sel.to.line; i <= e; ++i) indentLine(i, shift ? "subtract" : "add");
          break;
        }
        return true;
      }
  
      function indentLine(n, how) {
        if (how == "smart") {
          if (!mode.indent) how = "prev";
          else var state = getStateBefore(n);
        }
  
        var line = lines[n], curSpace = line.indentation(), curSpaceString = line.text.match(/^\s*/)[0], indentation;
        if (how == "prev") {
          if (n) indentation = lines[n-1].indentation();
          else indentation = 0;
        }
        else if (how == "smart") indentation = mode.indent(state, line.text.slice(curSpaceString.length));
        else if (how == "add") indentation = curSpace + options.indentUnit;
        else if (how == "subtract") indentation = curSpace - options.indentUnit;
        indentation = Math.max(0, indentation);
        var diff = indentation - curSpace;
  
        if (!diff) {
          if (sel.from.line != n && sel.to.line != n) return;
          var indentString = curSpaceString;
        }
        else {
          var indentString = "", pos = 0;
          if (options.indentWithTabs)
            for (var i = Math.floor(indentation / tabSize); i; --i) {pos += tabSize; indentString += "\t";}
          while (pos < indentation) {++pos; indentString += " ";}
        }
  
        replaceRange(indentString, {line: n, ch: 0}, {line: n, ch: curSpaceString.length});
      }
  
      function loadMode() {
        mode = CodeMirror.getMode(options, options.mode);
        for (var i = 0, l = lines.length; i < l; ++i)
          lines[i].stateAfter = null;
        work = [0];
        startWorker();
      }
      function gutterChanged() {
        var visible = options.gutter || options.lineNumbers;
        gutter.style.display = visible ? "" : "none";
        if (visible) updateGutter();
        else lineDiv.parentNode.style.marginLeft = 0;
      }
  
      function markText(from, to, className) {
        from = clipPos(from); to = clipPos(to);
        var accum = [];
        function add(line, from, to, className) {
          var line = lines[line], mark = line.addMark(from, to, className);
          mark.line = line;
          accum.push(mark);
        }
        if (from.line == to.line) add(from.line, from.ch, to.ch, className);
        else {
          add(from.line, from.ch, null, className);
          for (var i = from.line + 1, e = to.line; i < e; ++i)
            add(i, 0, null, className);
          add(to.line, 0, to.ch, className);
        }
        changes.push({from: from.line, to: to.line + 1});
        return function() {
          var start, end;
          for (var i = 0; i < accum.length; ++i) {
            var mark = accum[i], found = indexOf(lines, mark.line);
            mark.line.removeMark(mark);
            if (found > -1) {
              if (start == null) start = found;
              end = found;
            }
          }
          if (start != null) changes.push({from: start, to: end + 1});
        };
      }
  
      function addGutterMarker(line, text, className) {
        if (typeof line == "number") line = lines[clipLine(line)];
        line.gutterMarker = {text: text, style: className};
        updateGutter();
        return line;
      }
      function removeGutterMarker(line) {
        if (typeof line == "number") line = lines[clipLine(line)];
        line.gutterMarker = null;
        updateGutter();
      }
      function setLineClass(line, className) {
        if (typeof line == "number") {
          var no = line;
          line = lines[clipLine(line)];
        }
        else {
          var no = indexOf(lines, line);
          if (no == -1) return null;
        }
        line.className = className;
        changes.push({from: no, to: no + 1});
        return line;
      }
  
      function lineInfo(line) {
        if (typeof line == "number") {
          var n = line;
          line = lines[line];
          if (!line) return null;
        }
        else {
          var n = indexOf(lines, line);
          if (n == -1) return null;
        }
        var marker = line.gutterMarker;
        return {line: n, text: line.text, markerText: marker && marker.text, markerClass: marker && marker.style};
      }
  
      function stringWidth(str) {
        measure.innerHTML = "<pre><span>x</span></pre>";
        measure.firstChild.firstChild.firstChild.nodeValue = str;
        return measure.firstChild.firstChild.offsetWidth || 10;
      }
      // These are used to go from pixel positions to character
      // positions, taking varying character widths into account.
      function charX(line, pos) {
        if (pos == 0) return 0;
        measure.innerHTML = "<pre><span>" + lines[line].getHTML(null, null, false, pos) + "</span></pre>";
        return measure.firstChild.firstChild.offsetWidth;
      }
      function charFromX(line, x) {
        if (x <= 0) return 0;
        var lineObj = lines[line], text = lineObj.text;
        function getX(len) {
          measure.innerHTML = "<pre><span>" + lineObj.getHTML(null, null, false, len) + "</span></pre>";
          return measure.firstChild.firstChild.offsetWidth;
        }
        var from = 0, fromX = 0, to = text.length, toX;
        // Guess a suitable upper bound for our search.
        var estimated = Math.min(to, Math.ceil(x / stringWidth("x")));
        for (;;) {
          var estX = getX(estimated);
          if (estX <= x && estimated < to) estimated = Math.min(to, Math.ceil(estimated * 1.2));
          else {toX = estX; to = estimated; break;}
        }
        if (x > toX) return to;
        // Try to guess a suitable lower bound as well.
        estimated = Math.floor(to * 0.8); estX = getX(estimated);
        if (estX < x) {from = estimated; fromX = estX;}
        // Do a binary search between these bounds.
        for (;;) {
          if (to - from <= 1) return (toX - x > x - fromX) ? from : to;
          var middle = Math.ceil((from + to) / 2), middleX = getX(middle);
          if (middleX > x) {to = middle; toX = middleX;}
          else {from = middle; fromX = middleX;}
        }
      }
  
      function localCoords(pos, inLineWrap) {
        var lh = lineHeight(), line = pos.line - (inLineWrap ? showingFrom : 0);
        return {x: charX(pos.line, pos.ch), y: line * lh, yBot: (line + 1) * lh};
      }
      function pageCoords(pos) {
        var local = localCoords(pos, true), off = eltOffset(lineSpace);
        return {x: off.left + local.x, y: off.top + local.y, yBot: off.top + local.yBot};
      }
  
      function lineHeight() {
        var nlines = lineDiv.childNodes.length;
        if (nlines) return lineDiv.offsetHeight / nlines;
        measure.innerHTML = "<pre>x</pre>";
        return measure.firstChild.offsetHeight || 1;
      }
      function paddingTop() {return lineSpace.offsetTop;}
      function paddingLeft() {return lineSpace.offsetLeft;}
  
      function posFromMouse(e, liberal) {
        var offW = eltOffset(wrapper), x = e.pageX(), y = e.pageY();
        // This is a mess of a heuristic to try and determine whether a
        // scroll-bar was clicked or not, and to return null if one was
        // (and !liberal).
        if (!liberal && (x - offW.left > wrapper.clientWidth || y - offW.top > wrapper.clientHeight))
          return null;
        var offL = eltOffset(lineSpace);
        var line = showingFrom + Math.floor((y - offL.top) / lineHeight());
        return clipPos({line: line, ch: charFromX(clipLine(line), x - offL.left)});
      }
      function onContextMenu(e) {
        var pos = posFromMouse(e);
        if (!pos || window.opera) return; // Opera is difficult.
        if (posEq(sel.from, sel.to) || posLess(pos, sel.from) || !posLess(pos, sel.to))
          setCursor(pos.line, pos.ch);
  
        var oldCSS = input.style.cssText;
        input.style.cssText = "position: fixed; width: 30px; height: 30px; top: " + (e.pageY() - 1) +
          "px; left: " + (e.pageX() - 1) + "px; z-index: 1000; background: white; " +
          "border-width: 0; outline: none; overflow: hidden;";
        var val = input.value = getSelection();
        input.focus();
        setSelRange(input, 0, input.value.length);
        if (gecko) e.stop();
        leaveInputAlone = true;
        setTimeout(function() {
          if (input.value != val) operation(replaceSelection)(input.value, "end");
          input.style.cssText = oldCSS;
          leaveInputAlone = false;
          prepareInput();
          slowPoll();
        }, 50);
      }
  
      // Cursor-blinking
      function restartBlink() {
        clearInterval(blinker);
        var on = true;
        cursor.style.visibility = "";
        blinker = setInterval(function() {
          cursor.style.visibility = (on = !on) ? "" : "hidden";
        }, 650);
      }
  
      var matching = {"(": ")>", ")": "(<", "[": "]>", "]": "[<", "{": "}>", "}": "{<"};
      function matchBrackets(autoclear) {
        var head = sel.inverted ? sel.from : sel.to, line = lines[head.line], pos = head.ch - 1;
        var match = (pos >= 0 && matching[line.text.charAt(pos)]) || matching[line.text.charAt(++pos)];
        if (!match) return;
        var ch = match.charAt(0), forward = match.charAt(1) == ">", d = forward ? 1 : -1, st = line.styles;
        for (var off = pos + 1, i = 0, e = st.length; i < e; i+=2)
          if ((off -= st[i].length) <= 0) {var style = st[i+1]; break;}
  
        var stack = [line.text.charAt(pos)], re = /[(){}[\]]/;
        function scan(line, from, to) {
          if (!line.text) return;
          var st = line.styles, pos = forward ? 0 : line.text.length - 1, cur;
          for (var i = forward ? 0 : st.length - 2, e = forward ? st.length : -2; i != e; i += 2*d) {
            var text = st[i];
            if (st[i+1] != null && st[i+1] != style) {pos += d * text.length; continue;}
            for (var j = forward ? 0 : text.length - 1, te = forward ? text.length : -1; j != te; j += d, pos+=d) {
              if (pos >= from && pos < to && re.test(cur = text.charAt(j))) {
                var match = matching[cur];
                if (match.charAt(1) == ">" == forward) stack.push(cur);
                else if (stack.pop() != match.charAt(0)) return {pos: pos, match: false};
                else if (!stack.length) return {pos: pos, match: true};
              }
            }
          }
        }
        for (var i = head.line, e = forward ? Math.min(i + 50, lines.length) : Math.max(-1, i - 50); i != e; i+=d) {
          var line = lines[i], first = i == head.line;
          var found = scan(line, first && forward ? pos + 1 : 0, first && !forward ? pos : line.text.length);
          if (found) {
            var style = found.match ? "CodeMirror-matchingbracket" : "CodeMirror-nonmatchingbracket";
            var one = markText({line: head.line, ch: pos}, {line: head.line, ch: pos+1}, style),
                two = markText({line: i, ch: found.pos}, {line: i, ch: found.pos + 1}, style);
            var clear = operation(function(){one(); two();});
            if (autoclear) setTimeout(clear, 800);
            else bracketHighlighted = clear;
            break;
          }
        }
      }
  
      // Finds the line to start with when starting a parse. Tries to
      // find a line with a stateAfter, so that it can start with a
      // valid state. If that fails, it returns the line with the
      // smallest indentation, which tends to need the least context to
      // parse correctly.
      function findStartLine(n) {
        var minindent, minline;
        for (var search = n, lim = n - 40; search > lim; --search) {
          if (search == 0) return 0;
          var line = lines[search-1];
          if (line.stateAfter) return search;
          var indented = line.indentation();
          if (minline == null || minindent > indented) {
            minline = search;
            minindent = indented;
          }
        }
        return minline;
      }
      function getStateBefore(n) {
        var start = findStartLine(n), state = start && lines[start-1].stateAfter;
        if (!state) state = startState(mode);
        else state = copyState(mode, state);
        for (var i = start; i < n; ++i) {
          var line = lines[i];
          line.highlight(mode, state);
          line.stateAfter = copyState(mode, state);
        }
        if (!lines[n].stateAfter) work.push(n);
        return state;
      }
      function highlightWorker() {
        var end = +new Date + options.workTime;
        while (work.length) {
          if (!lines[showingFrom].stateAfter) var task = showingFrom;
          else var task = work.pop();
          if (task >= lines.length) continue;
          var start = findStartLine(task), state = start && lines[start-1].stateAfter;
          if (state) state = copyState(mode, state);
          else state = startState(mode);
  
          for (var i = start, l = lines.length; i < l; ++i) {
            var line = lines[i], hadState = line.stateAfter;
            if (+new Date > end) {
              work.push(i);
              startWorker(options.workDelay);
              changes.push({from: task, to: i});
              return;
            }
            var changed = line.highlight(mode, state);
            line.stateAfter = copyState(mode, state);
            if (hadState && !changed && line.text) break;
          }
          changes.push({from: task, to: i});
        }
      }
      function startWorker(time) {
        if (!work.length) return;
        highlight.set(time, operation(highlightWorker));
      }
  
      // Operations are used to wrap changes in such a way that each
      // change won't have to update the cursor and display (which would
      // be awkward, slow, and error-prone), but instead updates are
      // batched and then all combined and executed at once.
      function startOperation() {
        updateInput = null; changes = []; textChanged = selectionChanged = false;
      }
      function endOperation() {
        var reScroll = false;
        if (selectionChanged) reScroll = !scrollCursorIntoView();
        if (changes.length) updateDisplay(changes);
        else if (selectionChanged) updateCursor();
        if (reScroll) scrollCursorIntoView();
        if (selectionChanged) restartBlink();
  
        // updateInput can be set to a boolean value to force/prevent an
        // update.
        if (!leaveInputAlone && (updateInput === true || (updateInput !== false && selectionChanged)))
          prepareInput();
  
        if (selectionChanged && options.matchBrackets)
          setTimeout(operation(function() {
            if (bracketHighlighted) {bracketHighlighted(); bracketHighlighted = null;}
            matchBrackets(false);
          }), 20);
        var tc = textChanged; // textChanged can be reset by cursoractivity callback
        if (selectionChanged && options.onCursorActivity)
          options.onCursorActivity(instance);
        if (tc && options.onChange && instance)
          options.onChange(instance, tc);
      }
      var nestedOperation = 0;
      function operation(f) {
        return function() {
          if (!nestedOperation++) startOperation();
          try {var result = f.apply(this, arguments);}
          finally {if (!--nestedOperation) endOperation();}
          return result;
        };
      }
  
      function SearchCursor(query, pos, caseFold) {
        this.atOccurrence = false;
        if (caseFold == null) caseFold = typeof query == "string" && query == query.toLowerCase();
  
        if (pos && typeof pos == "object") pos = clipPos(pos);
        else pos = {line: 0, ch: 0};
        this.pos = {from: pos, to: pos};
  
        // The matches method is filled in based on the type of query.
        // It takes a position and a direction, and returns an object
        // describing the next occurrence of the query, or null if no
        // more matches were found.
        if (typeof query != "string") // Regexp match
          this.matches = function(reverse, pos) {
            if (reverse) {
              var line = lines[pos.line].text.slice(0, pos.ch), match = line.match(query), start = 0;
              while (match) {
                var ind = line.indexOf(match[0]);
                start += ind;
                line = line.slice(ind + 1);
                var newmatch = line.match(query);
                if (newmatch) match = newmatch;
                else break;
              }
            }
            else {
              var line = lines[pos.line].text.slice(pos.ch), match = line.match(query),
                  start = match && pos.ch + line.indexOf(match[0]);
            }
            if (match)
              return {from: {line: pos.line, ch: start},
                      to: {line: pos.line, ch: start + match[0].length},
                      match: match};
          };
        else { // String query
          if (caseFold) query = query.toLowerCase();
          var fold = caseFold ? function(str){return str.toLowerCase();} : function(str){return str;};
          var target = query.split("\n");
          // Different methods for single-line and multi-line queries
          if (target.length == 1)
            this.matches = function(reverse, pos) {
              var line = fold(lines[pos.line].text), len = query.length, match;
              if (reverse ? (pos.ch >= len && (match = line.lastIndexOf(query, pos.ch - len)) != -1)
                          : (match = line.indexOf(query, pos.ch)) != -1)
                return {from: {line: pos.line, ch: match},
                        to: {line: pos.line, ch: match + len}};
            };
          else
            this.matches = function(reverse, pos) {
              var ln = pos.line, idx = (reverse ? target.length - 1 : 0), match = target[idx], line = fold(lines[ln].text);
              var offsetA = (reverse ? line.indexOf(match) + match.length : line.lastIndexOf(match));
              if (reverse ? offsetA >= pos.ch || offsetA != match.length
                          : offsetA <= pos.ch || offsetA != line.length - match.length)
                return;
              for (;;) {
                if (reverse ? !ln : ln == lines.length - 1) return;
                line = fold(lines[ln += reverse ? -1 : 1].text);
                match = target[reverse ? --idx : ++idx];
                if (idx > 0 && idx < target.length - 1) {
                  if (line != match) return;
                  else continue;
                }
                var offsetB = (reverse ? line.lastIndexOf(match) : line.indexOf(match) + match.length);
                if (reverse ? offsetB != line.length - match.length : offsetB != match.length)
                  return;
                var start = {line: pos.line, ch: offsetA}, end = {line: ln, ch: offsetB};
                return {from: reverse ? end : start, to: reverse ? start : end};
              }
            };
        }
      }
  
      SearchCursor.prototype = {
        findNext: function() {return this.find(false);},
        findPrevious: function() {return this.find(true);},
  
        find: function(reverse) {
          var self = this, pos = clipPos(reverse ? this.pos.from : this.pos.to);
          function savePosAndFail(line) {
            var pos = {line: line, ch: 0};
            self.pos = {from: pos, to: pos};
            self.atOccurrence = false;
            return false;
          }
  
          for (;;) {
            if (this.pos = this.matches(reverse, pos)) {
              this.atOccurrence = true;
              return this.pos.match || true;
            }
            if (reverse) {
              if (!pos.line) return savePosAndFail(0);
              pos = {line: pos.line-1, ch: lines[pos.line-1].text.length};
            }
            else {
              if (pos.line == lines.length - 1) return savePosAndFail(lines.length);
              pos = {line: pos.line+1, ch: 0};
            }
          }
        },
  
        from: function() {if (this.atOccurrence) return copyPos(this.pos.from);},
        to: function() {if (this.atOccurrence) return copyPos(this.pos.to);}
      };
  
      return instance;
    } // (end of function CodeMirror)
  
    // The default configuration options.
    CodeMirror.defaults = {
      value: "",
      mode: null,
      indentUnit: 2,
      indentWithTabs: false,
      tabMode: "classic",
      enterMode: "indent",
      electricChars: true,
      onKeyEvent: null,
      lineNumbers: false,
      gutter: false,
      firstLineNumber: 1,
      readOnly: false,
      onChange: null,
      onCursorActivity: null,
      onGutterClick: null,
      onFocus: null, onBlur: null, onScroll: null,
      matchBrackets: false,
      workTime: 100,
      workDelay: 200,
      undoDepth: 40,
      tabindex: null,
      document: window.document
    };
  
    // Known modes, by name and by MIME
    var modes = {}, mimeModes = {};
    CodeMirror.defineMode = function(name, mode) {
      if (!CodeMirror.defaults.mode && name != "null") CodeMirror.defaults.mode = name;
      modes[name] = mode;
    };
    CodeMirror.defineMIME = function(mime, spec) {
      mimeModes[mime] = spec;
    };
    CodeMirror.getMode = function(options, spec) {
      if (typeof spec == "string" && mimeModes.hasOwnProperty(spec))
        spec = mimeModes[spec];
      if (typeof spec == "string")
        var mname = spec, config = {};
      else if (spec != null)
        var mname = spec.name, config = spec;
      var mfactory = modes[mname];
      if (!mfactory) {
        if (window.console) console.warn("No mode " + mname + " found, falling back to plain text.");
        return CodeMirror.getMode(options, "text/plain");
      }
      return mfactory(options, config || {});
    }
    CodeMirror.listModes = function() {
      var list = [];
      for (var m in modes)
        if (modes.propertyIsEnumerable(m)) list.push(m);
      return list;
    };
    CodeMirror.listMIMEs = function() {
      var list = [];
      for (var m in mimeModes)
        if (mimeModes.propertyIsEnumerable(m)) list.push(m);
      return list;
    };
  
    CodeMirror.fromTextArea = function(textarea, options) {
      if (!options) options = {};
      options.value = textarea.value;
      if (!options.tabindex && textarea.tabindex)
        options.tabindex = textarea.tabindex;
  
      function save() {textarea.value = instance.getValue();}
      if (textarea.form) {
        // Deplorable hack to make the submit method do the right thing.
        var rmSubmit = connect(textarea.form, "submit", save, true);
        if (typeof textarea.form.submit == "function") {
          var realSubmit = textarea.form.submit;
          function wrappedSubmit() {
            save();
            textarea.form.submit = realSubmit;
            textarea.form.submit();
            textarea.form.submit = wrappedSubmit;
          }
          textarea.form.submit = wrappedSubmit;
        }
      }
  
      textarea.style.display = "none";
      var instance = CodeMirror(function(node) {
        textarea.parentNode.insertBefore(node, textarea.nextSibling);
      }, options);
      instance.save = save;
      instance.toTextArea = function() {
        save();
        textarea.parentNode.removeChild(instance.getWrapperElement());
        textarea.style.display = "";
        if (textarea.form) {
          rmSubmit();
          if (typeof textarea.form.submit == "function")
            textarea.form.submit = realSubmit;
        }
      };
      return instance;
    };
  
    // Utility functions for working with state. Exported because modes
    // sometimes need to do this.
    function copyState(mode, state) {
      if (state === true) return state;
      if (mode.copyState) return mode.copyState(state);
      var nstate = {};
      for (var n in state) {
        var val = state[n];
        if (val instanceof Array) val = val.concat([]);
        nstate[n] = val;
      }
      return nstate;
    }
    CodeMirror.startState = startState;
    function startState(mode, a1, a2) {
      return mode.startState ? mode.startState(a1, a2) : true;
    }
    CodeMirror.copyState = copyState;
  
    // The character stream used by a mode's parser.
    function StringStream(string) {
      this.pos = this.start = 0;
      this.string = string;
    }
    StringStream.prototype = {
      eol: function() {return this.pos >= this.string.length;},
      sol: function() {return this.pos == 0;},
      peek: function() {return this.string.charAt(this.pos);},
      next: function() {
        if (this.pos < this.string.length)
          return this.string.charAt(this.pos++);
      },
      eat: function(match) {
        var ch = this.string.charAt(this.pos);
        if (typeof match == "string") var ok = ch == match;
        else var ok = ch && (match.test ? match.test(ch) : match(ch));
        if (ok) {++this.pos; return ch;}
      },
      eatWhile: function(match) {
        var start = this.start;
        while (this.eat(match)){}
        return this.pos > start;
      },
      eatSpace: function() {
        var start = this.pos;
        while (/[\s\u00a0]/.test(this.string.charAt(this.pos))) ++this.pos;
        return this.pos > start;
      },
      skipToEnd: function() {this.pos = this.string.length;},
      skipTo: function(ch) {
        var found = this.string.indexOf(ch, this.pos);
        if (found > -1) {this.pos = found; return true;}
      },
      backUp: function(n) {this.pos -= n;},
      column: function() {return countColumn(this.string, this.start);},
      indentation: function() {return countColumn(this.string);},
      match: function(pattern, consume, caseInsensitive) {
        if (typeof pattern == "string") {
          function cased(str) {return caseInsensitive ? str.toLowerCase() : str;}
          if (cased(this.string).indexOf(cased(pattern), this.pos) == this.pos) {
            if (consume !== false) this.pos += pattern.length;
            return true;
          }
        }
        else {
          var match = this.string.slice(this.pos).match(pattern);
          if (match && consume !== false) this.pos += match[0].length;
          return match;
        }
      },
      current: function(){return this.string.slice(this.start, this.pos);}
    };
  
    // Line objects. These hold state related to a line, including
    // highlighting info (the styles array).
    function Line(text, styles) {
      this.styles = styles || [text, null];
      this.stateAfter = null;
      this.text = text;
      this.marked = this.gutterMarker = this.className = null;
    }
    Line.prototype = {
      // Replace a piece of a line, keeping the styles around it intact.
      replace: function(from, to, text) {
        var st = [], mk = this.marked;
        copyStyles(0, from, this.styles, st);
        if (text) st.push(text, null);
        copyStyles(to, this.text.length, this.styles, st);
        this.styles = st;
        this.text = this.text.slice(0, from) + text + this.text.slice(to);
        this.stateAfter = null;
        if (mk) {
          var diff = text.length - (to - from), end = this.text.length;
          function fix(n) {return n <= Math.min(to, to + diff) ? n : n + diff;}
          for (var i = 0; i < mk.length; ++i) {
            var mark = mk[i], del = false;
            if (mark.from >= end) del = true;
            else {mark.from = fix(mark.from); if (mark.to != null) mark.to = fix(mark.to);}
            if (del || mark.from >= mark.to) {mk.splice(i, 1); i--;}
          }
        }
      },
      // Split a line in two, again keeping styles intact.
      split: function(pos, textBefore) {
        var st = [textBefore, null];
        copyStyles(pos, this.text.length, this.styles, st);
        return new Line(textBefore + this.text.slice(pos), st);
      },
      addMark: function(from, to, style) {
        var mk = this.marked, mark = {from: from, to: to, style: style};
        if (this.marked == null) this.marked = [];
        this.marked.push(mark);
        this.marked.sort(function(a, b){return a.from - b.from;});
        return mark;
      },
      removeMark: function(mark) {
        var mk = this.marked;
        if (!mk) return;
        for (var i = 0; i < mk.length; ++i)
          if (mk[i] == mark) {mk.splice(i, 1); break;}
      },
      // Run the given mode's parser over a line, update the styles
      // array, which contains alternating fragments of text and CSS
      // classes.
      highlight: function(mode, state) {
        var stream = new StringStream(this.text), st = this.styles, pos = 0;
        var changed = false, curWord = st[0], prevWord;
        while (!stream.eol()) {
          var style = mode.token(stream, state);
          var substr = this.text.slice(stream.start, stream.pos);
          stream.start = stream.pos;
          if (pos && st[pos-1] == style)
            st[pos-2] += substr;
          else if (substr) {
            if (!changed && (st[pos+1] != style || (pos && st[pos-2] != prevWord))) changed = true;
            st[pos++] = substr; st[pos++] = style;
            prevWord = curWord; curWord = st[pos];
          }
          // Give up when line is ridiculously long
          if (stream.pos > 5000) {
            st[pos++] = this.text.slice(stream.pos); st[pos++] = null;
            break;
          }
        }
        if (st.length != pos) {st.length = pos; changed = true;}
        if (pos && st[pos-2] != prevWord) changed = true;
        return changed;
      },
      // Fetch the parser token for a given character. Useful for hacks
      // that want to inspect the mode state (say, for completion).
      getTokenAt: function(mode, state, ch) {
        var txt = this.text, stream = new StringStream(txt);
        while (stream.pos < ch && !stream.eol()) {
          stream.start = stream.pos;
          var style = mode.token(stream, state);
        }
        return {start: stream.start,
                end: stream.pos,
                string: stream.current(),
                className: style || null,
                state: state};
      },
      indentation: function() {return countColumn(this.text);},
      // Produces an HTML fragment for the line, taking selection,
      // marking, and highlighting into account.
      getHTML: function(sfrom, sto, includePre, endAt) {
        var html = [];
        if (includePre)
          html.push(this.className ? '<pre class="' + this.className + '">': "<pre>");
        function span(text, style) {
          if (!text) return;
          if (style) html.push('<span class="', style, '">', htmlEscape(text), "</span>");
          else html.push(htmlEscape(text));
        }
        var st = this.styles, allText = this.text, marked = this.marked;
        if (sfrom == sto) sfrom = null;
        var len = allText.length;
        if (endAt != null) len = Math.min(endAt, len);
  
        if (!allText && endAt == null)
          span(" ", sfrom != null && sto == null ? "CodeMirror-selected" : null);
        else if (!marked && sfrom == null)
          for (var i = 0, ch = 0; ch < len; i+=2) {
            var str = st[i], l = str.length;
            if (ch + l > len) str = str.slice(0, len - ch);
            ch += l;
            span(str, st[i+1]);
          }
        else {
          var pos = 0, i = 0, text = "", style, sg = 0;
          var markpos = -1, mark = null;
          function nextMark() {
            if (marked) {
              markpos += 1;
              mark = (markpos < marked.length) ? marked[markpos] : null;
            }
          }
          nextMark();
          while (pos < len) {
            var upto = len;
            var extraStyle = "";
            if (sfrom != null) {
              if (sfrom > pos) upto = sfrom;
              else if (sto == null || sto > pos) {
                extraStyle = " CodeMirror-selected";
                if (sto != null) upto = Math.min(upto, sto);
              }
            }
            while (mark && mark.to != null && mark.to <= pos) nextMark();
            if (mark) {
              if (mark.from > pos) upto = Math.min(upto, mark.from);
              else {
                extraStyle += " " + mark.style;
                if (mark.to != null) upto = Math.min(upto, mark.to);
              }
            }
            for (;;) {
              var end = pos + text.length;
              var apliedStyle = style;
              if (extraStyle) apliedStyle = style ? style + extraStyle : extraStyle;
              span(end > upto ? text.slice(0, upto - pos) : text, apliedStyle);
              if (end >= upto) {text = text.slice(upto - pos); pos = upto; break;}
              pos = end;
              text = st[i++]; style = st[i++];
            }
          }
          if (sfrom != null && sto == null) span(" ", "CodeMirror-selected");
        }
        if (includePre) html.push("</pre>");
        return html.join("");
      }
    };
    // Utility used by replace and split above
    function copyStyles(from, to, source, dest) {
      for (var i = 0, pos = 0, state = 0; pos < to; i+=2) {
        var part = source[i], end = pos + part.length;
        if (state == 0) {
          if (end > from) dest.push(part.slice(from - pos, Math.min(part.length, to - pos)), source[i+1]);
          if (end >= from) state = 1;
        }
        else if (state == 1) {
          if (end > to) dest.push(part.slice(0, to - pos), source[i+1]);
          else dest.push(part, source[i+1]);
        }
        pos = end;
      }
    }
  
    // The history object 'chunks' changes that are made close together
    // and at almost the same time into bigger undoable units.
    function History() {
      this.time = 0;
      this.done = []; this.undone = [];
    }
    History.prototype = {
      addChange: function(start, added, old) {
        this.undone.length = 0;
        var time = +new Date, last = this.done[this.done.length - 1];
        if (time - this.time > 400 || !last ||
            last.start > start + added || last.start + last.added < start - last.added + last.old.length)
          this.done.push({start: start, added: added, old: old});
        else {
          var oldoff = 0;
          if (start < last.start) {
            for (var i = last.start - start - 1; i >= 0; --i)
              last.old.unshift(old[i]);
            last.added += last.start - start;
            last.start = start;
          }
          else if (last.start < start) {
            oldoff = start - last.start;
            added += oldoff;
          }
          for (var i = last.added - oldoff, e = old.length; i < e; ++i)
            last.old.push(old[i]);
          if (last.added < added) last.added = added;
        }
        this.time = time;
      }
    };
  
    // Event stopping compatibility wrapper.
    function stopEvent() {
      if (this.preventDefault) {this.preventDefault(); this.stopPropagation();}
      else {this.returnValue = false; this.cancelBubble = true;}
    }
    // Ensure an event has a stop method.
    function addStop(event) {
      if (!event.stop) event.stop = stopEvent;
      return event;
    }
  
    // Event wrapper, exposing the few operations we need.
    function Event(orig) {this.e = orig;}
    Event.prototype = {
      stop: function() {stopEvent.call(this.e);},
      target: function() {return this.e.target || this.e.srcElement;},
      button: function() {
        if (this.e.which) return this.e.which;
        else if (this.e.button & 1) return 1;
        else if (this.e.button & 2) return 3;
        else if (this.e.button & 4) return 2;
      },
      pageX: function() {
        if (this.e.pageX != null) return this.e.pageX;
        var doc = this.target().ownerDocument;
        return this.e.clientX + doc.body.scrollLeft + doc.documentElement.scrollLeft;
      },
      pageY: function() {
        if (this.e.pageY != null) return this.e.pageY;
        var doc = this.target().ownerDocument;
        return this.e.clientY + doc.body.scrollTop + doc.documentElement.scrollTop;
      }
    };
  
    // Event handler registration. If disconnect is true, it'll return a
    // function that unregisters the handler.
    function connect(node, type, handler, disconnect) {
      function wrapHandler(event) {handler(new Event(event || window.event));}
      if (typeof node.addEventListener == "function") {
        node.addEventListener(type, wrapHandler, false);
        if (disconnect) return function() {node.removeEventListener(type, wrapHandler, false);};
      }
      else {
        node.attachEvent("on" + type, wrapHandler);
        if (disconnect) return function() {node.detachEvent("on" + type, wrapHandler);};
      }
    }
  
    function Delayed() {this.id = null;}
    Delayed.prototype = {set: function(ms, f) {clearTimeout(this.id); this.id = setTimeout(f, ms);}};
  
    // Some IE versions don't preserve whitespace when setting the
    // innerHTML of a PRE tag.
    var badInnerHTML = (function() {
      var pre = document.createElement("pre");
      pre.innerHTML = " "; return !pre.innerHTML;
    })();
  
    var gecko = /gecko\/\d{7}/i.test(navigator.userAgent);
  
    var lineSep = "\n";
    // Feature-detect whether newlines in textareas are converted to \r\n
    (function () {
      var te = document.createElement("textarea");
      te.value = "foo\nbar";
      if (te.value.indexOf("\r") > -1) lineSep = "\r\n";
    }());
  
    var tabSize = 8;
    var mac = /Mac/.test(navigator.platform);
    var movementKeys = {};
    for (var i = 35; i <= 40; ++i)
      movementKeys[i] = movementKeys["c" + i] = true;
  
    // Counts the column offset in a string, taking tabs into account.
    // Used mostly to find indentation.
    function countColumn(string, end) {
      if (end == null) {
        end = string.search(/[^\s\u00a0]/);
        if (end == -1) end = string.length;
      }
      for (var i = 0, n = 0; i < end; ++i) {
        if (string.charAt(i) == "\t") n += tabSize - (n % tabSize);
        else ++n;
      }
      return n;
    }
  
    // Find the position of an element by following the offsetParent chain.
    function eltOffset(node) {
      var x = 0, y = 0;
      for (var n = node; n; n = n.offsetParent) {x += n.offsetLeft; y += n.offsetTop;}
      for (var n = node.parentNode; n != node.ownerDocument.body; n = n.parentNode) {x -= n.scrollLeft; y -= n.scrollTop;}
      return {left: x, top: y};
    }
    // Get a node's text content.
    function eltText(node) {
      return node.textContent || node.innerText || node.nodeValue || "";
    }
  
    // Operations on {line, ch} objects.
    function posEq(a, b) {return a.line == b.line && a.ch == b.ch;}
    function posLess(a, b) {return a.line < b.line || (a.line == b.line && a.ch < b.ch);}
    function copyPos(x) {return {line: x.line, ch: x.ch};}
  
    function htmlEscape(str) {
      return str.replace(/[<>&]/g, function(str) {
        return str == "&" ? "&amp;" : str == "<" ? "&lt;" : "&gt;";
      });
    }
  
    // Used to position the cursor after an undo/redo by finding the
    // last edited character.
    function editEnd(from, to) {
      if (!to) return from ? from.length : 0;
      if (!from) return to.length;
      for (var i = from.length, j = to.length; i >= 0 && j >= 0; --i, --j)
        if (from.charAt(i) != to.charAt(j)) break;
      return j + 1;
    }
  
    function indexOf(collection, elt) {
      if (collection.indexOf) return collection.indexOf(elt);
      for (var i = 0, e = collection.length; i < e; ++i)
        if (collection[i] == elt) return i;
      return -1;
    }
  
    // See if "".split is the broken IE version, if so, provide an
    // alternative way to split lines.
    if ("\n\nb".split(/\n/).length != 3)
      var splitLines = function(string) {
        var pos = 0, nl, result = [];
        while ((nl = string.indexOf("\n", pos)) > -1) {
          result.push(string.slice(pos, string.charAt(nl-1) == "\r" ? nl - 1 : nl));
          pos = nl + 1;
        }
        result.push(string.slice(pos));
        return result;
      };
    else
      var splitLines = function(string){return string.split(/\r?\n/);};
  
    // Sane model of finding and setting the selection in a textarea
    if (window.getSelection) {
      var selRange = function(te) {
        try {return {start: te.selectionStart, end: te.selectionEnd};}
        catch(e) {return null;}
      };
      var setSelRange = function(te, start, end) {
        try {te.setSelectionRange(start, end);}
        catch(e) {} // Fails on Firefox when textarea isn't part of the document
      };
    }
    // IE model. Don't ask.
    else {
      var selRange = function(te) {
        try {var range = te.ownerDocument.selection.createRange();}
        catch(e) {return null;}
        if (!range || range.parentElement() != te) return null;
        var val = te.value, len = val.length, localRange = te.createTextRange();
        localRange.moveToBookmark(range.getBookmark());
        var endRange = te.createTextRange();
        endRange.collapse(false);
  
        if (localRange.compareEndPoints("StartToEnd", endRange) > -1)
          return {start: len, end: len};
  
        var start = -localRange.moveStart("character", -len);
        for (var i = val.indexOf("\r"); i > -1 && i < start; i = val.indexOf("\r", i+1), start++) {}
  
        if (localRange.compareEndPoints("EndToEnd", endRange) > -1)
          return {start: start, end: len};
  
        var end = -localRange.moveEnd("character", -len);
        for (var i = val.indexOf("\r"); i > -1 && i < end; i = val.indexOf("\r", i+1), end++) {}
        return {start: start, end: end};
      };
      var setSelRange = function(te, start, end) {
        var range = te.createTextRange();
        range.collapse(true);
        var endrange = range.duplicate();
        var newlines = 0, txt = te.value;
        for (var pos = txt.indexOf("\n"); pos > -1 && pos < start; pos = txt.indexOf("\n", pos + 1))
          ++newlines;
        range.move("character", start - newlines);
        for (; pos > -1 && pos < end; pos = txt.indexOf("\n", pos + 1))
          ++newlines;
        endrange.move("character", end - newlines);
        range.setEndPoint("EndToEnd", endrange);
        range.select();
      };
    }
  
    CodeMirror.defineMode("null", function() {
      return {token: function(stream) {stream.skipToEnd();}};
    });
    CodeMirror.defineMIME("text/plain", "null");
  
    return CodeMirror;
  })();
  