text: // CodeMirror version 2.25
  //
  // 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. Its
    // 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];
  
      // The element in which the editor lives.
      var wrapper = document.createElement("div");
      wrapper.className = "CodeMirror" + (options.lineWrapping ? " CodeMirror-wrap" : "");
      // This mess creates the base DOM structure for the editor.
      wrapper.innerHTML =
        '<div style="overflow: hidden; position: relative; width: 3px; height: 0px;">' + // Wraps and hides input textarea
          '<textarea style="position: absolute; padding: 0; width: 1px; height: 1em" wrap="off" ' +
            'autocorrect="off" autocapitalize="off"></textarea></div>' +
        '<div class="CodeMirror-scroll" tabindex="-1">' +
          '<div style="position: relative">' + // Set to the height of the text, causes scrolling
            '<div style="position: relative">' + // Moved around its parent to cover visible view
              '<div class="CodeMirror-gutter"><div class="CodeMirror-gutter-text"></div></div>' +
              // Provides positioning relative to (visible) text origin
              '<div class="CodeMirror-lines"><div style="position: relative; z-index: 0">' +
                '<div style="position: absolute; width: 100%; height: 0; overflow: hidden; visibility: hidden;"></div>' +
                '<pre class="CodeMirror-cursor">&#160;</pre>' + // Absolutely positioned blinky cursor
                '<div style="position: relative; z-index: -1"></div><div></div>' + // DIVs containing the selection and the actual code
              '</div></div></div></div></div>';
      if (place.appendChild) place.appendChild(wrapper); else place(wrapper);
      // I've never seen more elegant code in my life.
      var inputDiv = wrapper.firstChild, input = inputDiv.firstChild,
          scroller = wrapper.lastChild, code = scroller.firstChild,
          mover = code.firstChild, gutter = mover.firstChild, gutterText = gutter.firstChild,
          lineSpace = gutter.nextSibling.firstChild, measure = lineSpace.firstChild,
          cursor = measure.nextSibling, selectionDiv = cursor.nextSibling,
          lineDiv = selectionDiv.nextSibling;
      themeChanged(); keyMapChanged();
      // Needed to hide big blue blinking cursor on Mobile Safari
      if (ios) input.style.width = "0px";
      if (!webkit) lineSpace.draggable = true;
      lineSpace.style.outline = "none";
      if (options.tabindex != null) input.tabIndex = options.tabindex;
      if (options.autofocus) focusInput();
      if (!options.gutter && !options.lineNumbers) gutter.style.display = "none";
      // Needed to handle Tab key in KHTML
      if (khtml) inputDiv.style.height = "1px", inputDiv.style.position = "absolute";
  
      // Check for problem with IE innerHTML not working when we have a
      // P (or similar) parent node.
      try { stringWidth("x"); }
      catch (e) {
        if (e.message.match(/runtime/i))
          e = new Error("A CodeMirror inside a P-style element does not work in Internet Explorer. (innerHTML bug)");
        throw e;
      }
  
      // 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. doc is the tree of Line objects,
      // work an array of lines that should be parsed, and history the
      // undo history (instance of History constructor).
      var mode, doc = new BranchChunk([new LeafChunk([new Line("")])]), work, 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.
      var shiftSelecting, lastClick, lastDoubleClick, lastScrollPos = 0, draggingText,
          overwrite = false, suppressEdits = false;
      // Variables used by startOperation/endOperation to track what
      // happened during the operation.
      var updateInput, userSelChange, changes, textChanged, selectionChanged, leaveInputAlone,
          gutterDirty, callbacks, maxLengthChanged;
      // Current visible range (may be bigger than the view window).
      var displayOffset = 0, showingFrom = 0, showingTo = 0, lastSizeC = 0;
      // bracketHighlighted is used to remember that a bracket has been
      // marked.
      var bracketHighlighted;
      // Tracks the maximum line length so that the horizontal scrollbar
      // can be kept static when scrolling.
      var maxLine = "", maxWidth;
      var tabCache = {};
  
      // Initialize the content.
      operation(function(){setValue(options.value || ""); updateInput = false;})();
      var history = new History();
  
      // Register our event handlers.
      connect(scroller, "mousedown", operation(onMouseDown));
      connect(scroller, "dblclick", operation(onDoubleClick));
      connect(lineSpace, "selectstart", e_preventDefault);
      // 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(scroller, "contextmenu", onContextMenu);
      connect(scroller, "scroll", function() {
        lastScrollPos = scroller.scrollTop;
        updateDisplay([]);
        if (options.fixedGutter) gutter.style.left = scroller.scrollLeft + "px";
        if (options.onScroll) options.onScroll(instance);
      });
      connect(window, "resize", function() {updateDisplay(true);});
      connect(input, "keyup", operation(onKeyUp));
      connect(input, "input", fastPoll);
      connect(input, "keydown", operation(onKeyDown));
      connect(input, "keypress", operation(onKeyPress));
      connect(input, "focus", onFocus);
      connect(input, "blur", onBlur);
  
      if (options.dragDrop) {
        connect(lineSpace, "dragstart", onDragStart);
        function drag_(e) {
          if (options.onDragEvent && options.onDragEvent(instance, addStop(e))) return;
          e_stop(e);
        }
        connect(scroller, "dragenter", drag_);
        connect(scroller, "dragover", drag_);
        connect(scroller, "drop", operation(onDrop));
      }
      connect(scroller, "paste", function(){focusInput(); fastPoll();});
      connect(input, "paste", fastPoll);
      connect(input, "cut", operation(function(){
        if (!options.readOnly) replaceSelection("");
      }));
  
      // Needed to handle Tab key in KHTML
      if (khtml) connect(code, "mouseup", function() {
          if (document.activeElement == input) input.blur();
          focusInput();
      });
  
      // IE throws unspecified error in certain cases, when
      // trying to access activeElement before onload
      var hasFocus; try { hasFocus = (document.activeElement == input); } catch(e) { }
      if (hasFocus || options.autofocus) setTimeout(onFocus, 20);
      else onBlur();
  
      function isLine(l) {return l >= 0 && l < doc.size;}
      // 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 = wrapper.CodeMirror = {
        getValue: getValue,
        setValue: operation(setValue),
        getSelection: getSelection,
        replaceSelection: operation(replaceSelection),
        focus: function(){window.focus(); focusInput(); onFocus(); fastPoll();},
        setOption: function(option, value) {
          var oldVal = options[option];
          options[option] = value;
          if (option == "mode" || option == "indentUnit") loadMode();
          else if (option == "readOnly" && value == "nocursor") {onBlur(); input.blur();}
          else if (option == "readOnly" && !value) {resetInput(true);}
          else if (option == "theme") themeChanged();
          else if (option == "lineWrapping" && oldVal != value) operation(wrappingChanged)();
          else if (option == "tabSize") updateDisplay(true);
          else if (option == "keyMap") keyMapChanged();
          if (option == "lineNumbers" || option == "gutter" || option == "firstLineNumber" || option == "theme") {
            gutterChanged();
            updateDisplay(true);
          }
        },
        getOption: function(option) {return options[option];},
        undo: operation(undo),
        redo: operation(redo),
        indentLine: operation(function(n, dir) {
          if (typeof dir != "string") {
            if (dir == null) dir = options.smartIndent ? "smart" : "prev";
            else dir = dir ? "add" : "subtract";
          }
          if (isLine(n)) indentLine(n, dir);
        }),
        indentSelection: operation(indentSelected),
        historySize: function() {return {undo: history.done.length, redo: history.undone.length};},
        clearHistory: function() {history = new History();},
        matchBrackets: operation(function(){matchBrackets(true);}),
        getTokenAt: operation(function(pos) {
          pos = clipPos(pos);
          return getLine(pos.line).getTokenAt(mode, getStateBefore(pos.line), pos.ch);
        }),
        getStateAfter: function(line) {
          line = clipLine(line == null ? doc.size - 1: line);
          return getStateBefore(line + 1);
        },
        cursorCoords: function(start, mode) {
          if (start == null) start = sel.inverted;
          return this.charCoords(start ? sel.from : sel.to, mode);
        },
        charCoords: function(pos, mode) {
          pos = clipPos(pos);
          if (mode == "local") return localCoords(pos, false);
          if (mode == "div") return localCoords(pos, true);
          return pageCoords(pos);
        },
        coordsChar: function(coords) {
          var off = eltOffset(lineSpace);
          return coordsChar(coords.x - off.left, coords.y - off.top);
        },
        markText: operation(markText),
        setBookmark: setBookmark,
        findMarksAt: findMarksAt,
        setMarker: operation(addGutterMarker),
        clearMarker: operation(removeGutterMarker),
        setLineClass: operation(setLineClass),
        hideLine: operation(function(h) {return setLineHidden(h, true);}),
        showLine: operation(function(h) {return setLineHidden(h, false);}),
        onDeleteLine: function(line, f) {
          if (typeof line == "number") {
            if (!isLine(line)) return null;
            line = getLine(line);
          }
          (line.handlers || (line.handlers = [])).push(f);
          return line;
        },
        lineInfo: lineInfo,
        addWidget: function(pos, node, scroll, vert, horiz) {
          pos = localCoords(clipPos(pos));
          var top = pos.yBot, left = pos.x;
          node.style.position = "absolute";
          code.appendChild(node);
          if (vert == "over") top = pos.y;
          else if (vert == "near") {
            var vspace = Math.max(scroller.offsetHeight, doc.height * textHeight()),
                hspace = Math.max(code.clientWidth, lineSpace.clientWidth) - paddingLeft();
            if (pos.yBot + node.offsetHeight > vspace && pos.y > node.offsetHeight)
              top = pos.y - node.offsetHeight;
            if (left + node.offsetWidth > hspace)
              left = hspace - node.offsetWidth;
          }
          node.style.top = (top + paddingTop()) + "px";
          node.style.left = node.style.right = "";
          if (horiz == "right") {
            left = code.clientWidth - node.offsetWidth;
            node.style.right = "0px";
          } else {
            if (horiz == "left") left = 0;
            else if (horiz == "middle") left = (code.clientWidth - node.offsetWidth) / 2;
            node.style.left = (left + paddingLeft()) + "px";
          }
          if (scroll)
            scrollIntoView(left, top, left + node.offsetWidth, top + node.offsetHeight);
        },
  
        lineCount: function() {return doc.size;},
        clipPos: clipPos,
        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, user) {
          if (ch == null && typeof line.line == "number") setCursor(line.line, line.ch, user);
          else setCursor(line, ch, user);
        }),
        setSelection: operation(function(from, to, user) {
          (user ? setSelectionUser : setSelection)(clipPos(from), clipPos(to || from));
        }),
        getLine: function(line) {if (isLine(line)) return getLine(line).text;},
        getLineHandle: function(line) {if (isLine(line)) return getLine(line);},
        setLine: operation(function(line, text) {
          if (isLine(line)) replaceRange(text, {line: line, ch: 0}, {line: line, ch: getLine(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));},
  
        triggerOnKeyDown: operation(onKeyDown),
        execCommand: function(cmd) {return commands[cmd](instance);},
        // Stuff used by commands, probably not much use to outside code.
        moveH: operation(moveH),
        deleteH: operation(deleteH),
        moveV: operation(moveV),
        toggleOverwrite: function() {
          if(overwrite){
            overwrite = false;
            cursor.className = cursor.className.replace(" CodeMirror-overwrite", "");
          } else {
            overwrite = true;
            cursor.className += " CodeMirror-overwrite";
          }
        },
  
        posFromIndex: function(off) {
          var lineNo = 0, ch;
          doc.iter(0, doc.size, function(line) {
            var sz = line.text.length + 1;
            if (sz > off) { ch = off; return true; }
            off -= sz;
            ++lineNo;
          });
          return clipPos({line: lineNo, ch: ch});
        },
        indexFromPos: function (coords) {
          if (coords.line < 0 || coords.ch < 0) return 0;
          var index = coords.ch;
          doc.iter(0, coords.line, function (line) {
            index += line.text.length + 1;
          });
          return index;
        },
        scrollTo: function(x, y) {
          if (x != null) scroller.scrollLeft = x;
          if (y != null) scroller.scrollTop = y;
          updateDisplay([]);
        },
  
        operation: function(f){return operation(f)();},
        compoundChange: function(f){return compoundChange(f);},
        refresh: function(){
          updateDisplay(true);
          if (scroller.scrollHeight > lastScrollPos)
            scroller.scrollTop = lastScrollPos;
        },
        getInputField: function(){return input;},
        getWrapperElement: function(){return wrapper;},
        getScrollerElement: function(){return scroller;},
        getGutterElement: function(){return gutter;}
      };
  
      function getLine(n) { return getLineAt(doc, n); }
      function updateLineHeight(line, height) {
        gutterDirty = true;
        var diff = height - line.height;
        for (var n = line; n; n = n.parent) n.height += diff;
      }
  
      function setValue(code) {
        var top = {line: 0, ch: 0};
        updateLines(top, {line: doc.size - 1, ch: getLine(doc.size-1).text.length},
                    splitLines(code), top, top);
        updateInput = true;
      }
      function getValue() {
        var text = [];
        doc.iter(0, doc.size, function(line) { text.push(line.text); });
        return text.join("\n");
      }
  
      function onMouseDown(e) {
        setShift(e_prop(e, "shiftKey"));
        // Check whether this is a click in a widget
        for (var n = e_target(e); n != wrapper; n = n.parentNode)
          if (n.parentNode == code && n != mover) return;
  
        // See if this is a click in the gutter
        for (var n = e_target(e); n != wrapper; n = n.parentNode)
          if (n.parentNode == gutterText) {
            if (options.onGutterClick)
              options.onGutterClick(instance, indexOf(gutterText.childNodes, n) + showingFrom, e);
            return e_preventDefault(e);
          }
  
        var start = posFromMouse(e);
  
        switch (e_button(e)) {
        case 3:
          if (gecko && !mac) onContextMenu(e);
          return;
        case 2:
          if (start) setCursor(start.line, start.ch, true);
          setTimeout(focusInput, 20);
          return;
        }
        // For button 1, if it was clicked inside the editor
        // (posFromMouse returning non-null), we have to adjust the
        // selection.
        if (!start) {if (e_target(e) == scroller) e_preventDefault(e); return;}
  
        if (!focused) onFocus();
  
        var now = +new Date;
        if (lastDoubleClick && lastDoubleClick.time > now - 400 && posEq(lastDoubleClick.pos, start)) {
          e_preventDefault(e);
          setTimeout(focusInput, 20);
          return selectLine(start.line);
        } else if (lastClick && lastClick.time > now - 400 && posEq(lastClick.pos, start)) {
          lastDoubleClick = {time: now, pos: start};
          e_preventDefault(e);
          return selectWordAt(start);
        } else { lastClick = {time: now, pos: start}; }
  
        var last = start, going;
        if (options.dragDrop && dragAndDrop && !options.readOnly && !posEq(sel.from, sel.to) &&
            !posLess(start, sel.from) && !posLess(sel.to, start)) {
          // Let the drag handler handle this.
          if (webkit) lineSpace.draggable = true;
          function dragEnd(e2) {
            if (webkit) lineSpace.draggable = false;
            draggingText = false;
            up(); drop();
            if (Math.abs(e.clientX - e2.clientX) + Math.abs(e.clientY - e2.clientY) < 10) {
              e_preventDefault(e2);
              setCursor(start.line, start.ch, true);
              focusInput();
            }
          }
          var up = connect(document, "mouseup", operation(dragEnd), true);
          var drop = connect(scroller, "drop", operation(dragEnd), true);
          draggingText = true;
          // IE's approach to draggable
          if (lineSpace.dragDrop) lineSpace.dragDrop();
          return;
        }
        e_preventDefault(e);
        setCursor(start.line, start.ch, true);
  
        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);
          }
        }
  
        function done(e) {
          clearTimeout(going);
          var cur = posFromMouse(e);
          if (cur) setSelectionUser(start, cur);
          e_preventDefault(e);
          focusInput();
          updateInput = true;
          move(); up();
        }
        var move = connect(document, "mousemove", operation(function(e) {
          clearTimeout(going);
          e_preventDefault(e);
          if (!ie && !e_button(e)) done(e);
          else extend(e);
        }), true);
        var up = connect(document, "mouseup", operation(done), true);
      }
      function onDoubleClick(e) {
        for (var n = e_target(e); n != wrapper; n = n.parentNode)
          if (n.parentNode == gutterText) return e_preventDefault(e);
        var start = posFromMouse(e);
        if (!start) return;
        lastDoubleClick = {time: +new Date, pos: start};
        e_preventDefault(e);
        selectWordAt(start);
      }
      function onDrop(e) {
        if (options.onDragEvent && options.onDragEvent(instance, addStop(e))) return;
        e.preventDefault();
        var pos = posFromMouse(e, true), files = e.dataTransfer.files;
        if (!pos || options.readOnly) return;
        if (files && files.length && window.FileReader && window.File) {
          function loadFile(file, i) {
            var reader = new FileReader;
            reader.onload = function() {
              text[i] = reader.result;
              if (++read == n) {
                pos = clipPos(pos);
                operation(function() {
                  var end = replaceRange(text.join(""), pos, pos);
                  setSelectionUser(pos, end);
                })();
              }
            };
            reader.readAsText(file);
          }
          var n = files.length, text = Array(n), read = 0;
          for (var i = 0; i < n; ++i) loadFile(files[i], i);
        }
        else {
          try {
            var text = e.dataTransfer.getData("Text");
            if (text) {
              compoundChange(function() {
                var curFrom = sel.from, curTo = sel.to;
                setSelectionUser(pos, pos);
                if (draggingText) replaceRange("", curFrom, curTo);
                replaceSelection(text);
                focusInput();
              });
            }
          }
          catch(e){}
        }
      }
      function onDragStart(e) {
        var txt = getSelection();
        e.dataTransfer.setData("Text", txt);
        
        // Use dummy image instead of default browsers image.
        if (gecko || chrome) {
          var img = document.createElement('img');
          img.scr = 'data:image/gif;base64,R0lGODdhAgACAIAAAAAAAP///ywAAAAAAgACAAACAoRRADs='; //1x1 image
          e.dataTransfer.setDragImage(img, 0, 0);
        }
      }
  
      function doHandleBinding(bound, dropShift) {
        if (typeof bound == "string") {
          bound = commands[bound];
          if (!bound) return false;
        }
        var prevShift = shiftSelecting;
        try {
          if (options.readOnly) suppressEdits = true;
          if (dropShift) shiftSelecting = null;
          bound(instance);
        } catch(e) {
          if (e != Pass) throw e;
          return false;
        } finally {
          shiftSelecting = prevShift;
          suppressEdits = false;
        }
        return true;
      }
      function handleKeyBinding(e) {
        // Handle auto keymap transitions
        var startMap = getKeyMap(options.keyMap), next = startMap.auto;
        clearTimeout(maybeTransition);
        if (next && !isModifierKey(e)) maybeTransition = setTimeout(function() {
          if (getKeyMap(options.keyMap) == startMap) {
            options.keyMap = (next.call ? next.call(null, instance) : next);
          }
        }, 50);
  
        var name = keyNames[e_prop(e, "keyCode")], handled = false;
        if (name == null || e.altGraphKey) return false;
        if (e_prop(e, "altKey")) name = "Alt-" + name;
        if (e_prop(e, "ctrlKey")) name = "Ctrl-" + name;
        if (e_prop(e, "metaKey")) name = "Cmd-" + name;
  
        var stopped = false;
        function stop() { stopped = true; }
  
        if (e_prop(e, "shiftKey")) {
          handled = lookupKey("Shift-" + name, options.extraKeys, options.keyMap,
                              function(b) {return doHandleBinding(b, true);}, stop)
                 || lookupKey(name, options.extraKeys, options.keyMap, function(b) {
                   if (typeof b == "string" && /^go[A-Z]/.test(b)) return doHandleBinding(b);
                 }, stop);
        } else {
          handled = lookupKey(name, options.extraKeys, options.keyMap, doHandleBinding, stop);
        }
        if (stopped) handled = false;
        if (handled) {
          e_preventDefault(e);
          restartBlink();
          if (ie) { e.oldKeyCode = e.keyCode; e.keyCode = 0; }
        }
        return handled;
      }
      function handleCharBinding(e, ch) {
        var handled = lookupKey("'" + ch + "'", options.extraKeys,
                                options.keyMap, function(b) { return doHandleBinding(b, true); });
        if (handled) {
          e_preventDefault(e);
          restartBlink();
        }
        return handled;
      }
  
      var lastStoppedKey = null, maybeTransition;
      function onKeyDown(e) {
        if (!focused) onFocus();
        if (ie && e.keyCode == 27) { e.returnValue = false; }
        if (pollingFast) { if (readInput()) pollingFast = false; }
        if (options.onKeyEvent && options.onKeyEvent(instance, addStop(e))) return;
        var code = e_prop(e, "keyCode");
        // IE does strange things with escape.
        setShift(code == 16 || e_prop(e, "shiftKey"));
        // First give onKeyEvent option a chance to handle this.
        var handled = handleKeyBinding(e);
        if (window.opera) {
          lastStoppedKey = handled ? code : null;
          // Opera has no cut event... we try to at least catch the key combo
          if (!handled && code == 88 && e_prop(e, mac ? "metaKey" : "ctrlKey"))
            replaceSelection("");
        }
      }
      function onKeyPress(e) {
        if (pollingFast) readInput();
        if (options.onKeyEvent && options.onKeyEvent(instance, addStop(e))) return;
        var keyCode = e_prop(e, "keyCode"), charCode = e_prop(e, "charCode");
        if (window.opera && keyCode == lastStoppedKey) {lastStoppedKey = null; e_preventDefault(e); return;}
        if (((window.opera && (!e.which || e.which < 10)) || khtml) && handleKeyBinding(e)) return;
        var ch = String.fromCharCode(charCode == null ? keyCode : charCode);
        if (options.electricChars && mode.electricChars && options.smartIndent && !options.readOnly) {
          if (mode.electricChars.indexOf(ch) > -1)
            setTimeout(operation(function() {indentLine(sel.to.line, "smart");}), 75);
        }
        if (handleCharBinding(e, ch)) return;
        fastPoll();
      }
      function onKeyUp(e) {
        if (options.onKeyEvent && options.onKeyEvent(instance, addStop(e))) return;
        if (e_prop(e, "keyCode") == 16) shiftSelecting = null;
      }
  
      function onFocus() {
        if (options.readOnly == "nocursor") return;
        if (!focused) {
          if (options.onFocus) options.onFocus(instance);
          focused = true;
          if (wrapper.className.search(/\bCodeMirror-focused\b/) == -1)
            wrapper.className += " CodeMirror-focused";
          if (!leaveInputAlone) resetInput(true);
        }
        slowPoll();
        restartBlink();
      }
      function onBlur() {
        if (focused) {
          if (options.onBlur) options.onBlur(instance);
          focused = false;
          if (bracketHighlighted)
            operation(function(){
              if (bracketHighlighted) { bracketHighlighted(); bracketHighlighted = null; }
            })();
          wrapper.className = wrapper.className.replace(" CodeMirror-focused", "");
        }
        clearInterval(blinker);
        setTimeout(function() {if (!focused) shiftSelecting = null;}, 150);
      }
  
      // 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 (suppressEdits) return;
        if (history) {
          var old = [];
          doc.iter(from.line, to.line + 1, function(line) { old.push(line.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) {
        if (!from.length) return;
        var set = from.pop(), out = [];
        for (var i = set.length - 1; i >= 0; i -= 1) {
          var change = set[i];
          var replaced = [], end = change.start + change.added;
          doc.iter(change.start, end, function(line) { replaced.push(line.text); });
          out.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: getLine(end-1).text.length}, change.old, pos, pos);
        }
        updateInput = true;
        to.push(out);
      }
      function undo() {unredoHelper(history.done, history.undone);}
      function redo() {unredoHelper(history.undone, history.done);}
  
      function updateLinesNoUndo(from, to, newText, selFrom, selTo) {
        if (suppressEdits) return;
        var recomputeMaxLength = false, maxLineLength = maxLine.length;
        if (!options.lineWrapping)
          doc.iter(from.line, to.line + 1, function(line) {
            if (!line.hidden && line.text.length == maxLineLength) {recomputeMaxLength = true; return true;}
          });
        if (from.line != to.line || newText.length > 1) gutterDirty = true;
  
        var nlines = to.line - from.line, firstLine = getLine(from.line), lastLine = getLine(to.line);
        // First adjust the line structure, taking some care to leave highlighting intact.
        if (from.ch == 0 && to.ch == 0 && newText[newText.length - 1] == "") {
          // This is a whole-line replace. Treated specially to make
          // sure line objects move the way they are supposed to.
          var added = [], prevLine = null;
          if (from.line) {
            prevLine = getLine(from.line - 1);
            prevLine.fixMarkEnds(lastLine);
          } else lastLine.fixMarkStarts();
          for (var i = 0, e = newText.length - 1; i < e; ++i)
            added.push(Line.inheritMarks(newText[i], prevLine));
          if (nlines) doc.remove(from.line, nlines, callbacks);
          if (added.length) doc.insert(from.line, added);
        } else 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]);
            firstLine.replace(from.ch, null, newText[0]);
            firstLine.fixMarkEnds(lastLine);
            var added = [];
            for (var i = 1, e = newText.length - 1; i < e; ++i)
              added.push(Line.inheritMarks(newText[i], firstLine));
            added.push(lastLine);
            doc.insert(from.line + 1, added);
          }
        } else if (newText.length == 1) {
          firstLine.replace(from.ch, null, newText[0]);
          lastLine.replace(null, to.ch, "");
          firstLine.append(lastLine);
          doc.remove(from.line + 1, nlines, callbacks);
        } else {
          var added = [];
          firstLine.replace(from.ch, null, newText[0]);
          lastLine.replace(null, to.ch, newText[newText.length-1]);
          firstLine.fixMarkEnds(lastLine);
          for (var i = 1, e = newText.length - 1; i < e; ++i)
            added.push(Line.inheritMarks(newText[i], firstLine));
          if (nlines > 1) doc.remove(from.line + 1, nlines - 1, callbacks);
          doc.insert(from.line + 1, added);
        }
        if (options.lineWrapping) {
          var perLine = Math.max(5, scroller.clientWidth / charWidth() - 3);
          doc.iter(from.line, from.line + newText.length, function(line) {
            if (line.hidden) return;
            var guess = Math.ceil(line.text.length / perLine) || 1;
            if (guess != line.height) updateLineHeight(line, guess);
          });
        } else {
          doc.iter(from.line, from.line + newText.length, function(line) {
            var l = line.text;
            if (!line.hidden && l.length > maxLineLength) {
              maxLine = l; maxLineLength = l.length; maxWidth = null;
              recomputeMaxLength = false;
            }
          });
          if (recomputeMaxLength) maxLengthChanged = true;
        }
  
        // 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);
        }
        var hlEnd = from.line + Math.min(newText.length, 500);
        highlightLines(from.line, hlEnd);
        newWork.push(hlEnd);
        work = newWork;
        startWorker(100);
        // Remember that these lines changed, for updating the display
        changes.push({from: from.line, to: to.line + 1, diff: lendiff});
        var changeObj = {from: from, to: to, text: newText};
        if (textChanged) {
          for (var cur = textChanged; cur.next; cur = cur.next) {}
          cur.next = changeObj;
        } else textChanged = changeObj;
  
        // 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.
        if (scroller.clientHeight)
          code.style.height = (doc.height * textHeight() + 2 * paddingTop()) + "px";
      }
      
      function computeMaxLength() {
        var maxLineLength = 0; 
        maxLine = ""; maxWidth = null;
        doc.iter(0, doc.size, function(line) {
          var l = line.text;
          if (!line.hidden && l.length > maxLineLength) {
            maxLineLength = l.length; maxLine = l;
          }
        });
        maxLengthChanged = false;
      }
  
      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 getLine(l1).text.slice(from.ch, to.ch);
        var code = [getLine(l1).text.slice(from.ch)];
        doc.iter(l1 + 1, l2, function(line) { code.push(line.text); });
        code.push(getLine(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(options.pollInterval, function() {
          startOperation();
          readInput();
          if (focused) slowPoll();
          endOperation();
        });
      }
      function fastPoll() {
        var missed = false;
        pollingFast = true;
        function p() {
          startOperation();
          var changed = readInput();
          if (!changed && !missed) {missed = true; poll.set(60, p);}
          else {pollingFast = false; slowPoll();}
          endOperation();
        }
        poll.set(20, p);
      }
  
      // Previnput is a hack to work with IME. If we reset the textarea
      // on every change, that breaks IME. So we look for changes
      // compared to the previous content instead. (Modern browsers have
      // events that indicate IME taking place, but these are not widely
      // supported or compatible enough yet to rely on.)
      var prevInput = "";
      function readInput() {
        if (leaveInputAlone || !focused || hasSelection(input) || options.readOnly) return false;
        var text = input.value;
        if (text == prevInput) return false;
        shiftSelecting = null;
        var same = 0, l = Math.min(prevInput.length, text.length);
        while (same < l && prevInput[same] == text[same]) ++same;
        if (same < prevInput.length)
          sel.from = {line: sel.from.line, ch: sel.from.ch - (prevInput.length - same)};
        else if (overwrite && posEq(sel.from, sel.to))
          sel.to = {line: sel.to.line, ch: Math.min(getLine(sel.to.line).text.length, sel.to.ch + (text.length - same))};
        replaceSelection(text.slice(same), "end");
        if (text.length > 1000) { input.value = prevInput = ""; }
        else prevInput = text;
        return true;
      }
      function resetInput(user) {
        if (!posEq(sel.from, sel.to)) {
          prevInput = "";
          input.value = getSelection();
          selectInput(input);
        } else if (user) prevInput = input.value = "";
      }
  
      function focusInput() {
        if (options.readOnly != "nocursor") input.focus();
      }
  
      function scrollEditorIntoView() {
        if (!cursor.getBoundingClientRect) return;
        var rect = cursor.getBoundingClientRect();
        // IE returns bogus coordinates when the instance sits inside of an iframe and the cursor is hidden
        if (ie && rect.top == rect.bottom) return;
        var winH = window.innerHeight || Math.max(document.body.offsetHeight, document.documentElement.offsetHeight);
        if (rect.top < 0 || rect.bottom > winH) cursor.scrollIntoView();
      }
      function scrollCursorIntoView() {
        var cursor = localCoords(sel.inverted ? sel.from : sel.to);
        var x = options.lineWrapping ? Math.min(cursor.x, lineSpace.offsetWidth) : cursor.x;
        return scrollIntoView(x, cursor.y, x, cursor.yBot);
      }
      function scrollIntoView(x1, y1, x2, y2) {
        var pl = paddingLeft(), pt = paddingTop();
        y1 += pt; y2 += pt; x1 += pl; x2 += pl;
        var screen = scroller.clientHeight, screentop = scroller.scrollTop, scrolled = false, result = true;
        if (y1 < screentop) {scroller.scrollTop = Math.max(0, y1); scrolled = true;}
        else if (y2 > screentop + screen) {scroller.scrollTop = y2 - screen; scrolled = true;}
  
        var screenw = scroller.clientWidth, screenleft = scroller.scrollLeft;
        var gutterw = options.fixedGutter ? gutter.clientWidth : 0;
        var atLeft = x1 < gutterw + pl + 10;
        if (x1 < screenleft + gutterw || atLeft) {
          if (atLeft) x1 = 0;
          scroller.scrollLeft = Math.max(0, x1 - 10 - gutterw);
          scrolled = true;
        }
        else if (x2 > screenw + screenleft - 3) {
          scroller.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 = textHeight(), top = scroller.scrollTop - paddingTop();
        var fromHeight = Math.max(0, Math.floor(top / lh));
        var toHeight = Math.ceil((top + scroller.clientHeight) / lh);
        return {from: lineAtHeight(doc, fromHeight),
                to: lineAtHeight(doc, toHeight)};
      }
      // 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, suppressCallback) {
        if (!scroller.clientWidth) {
          showingFrom = showingTo = displayOffset = 0;
          return;
        }
        // Compute the new visible window
        var visible = visibleLines();
        // Bail out if the visible area is already rendered and nothing changed.
        if (changes !== true && changes.length == 0 && visible.from > showingFrom && visible.to < showingTo) return;
        var from = Math.max(visible.from - 100, 0), to = Math.min(doc.size, visible.to + 100);
        if (showingFrom < from && from - showingFrom < 20) from = showingFrom;
        if (showingTo > to && showingTo - to < 20) to = Math.min(doc.size, showingTo);
  
        // Create a range of theoretically intact lines, and punch holes
        // in that using the change info.
        var intact = changes === true ? [] :
          computeIntact([{from: showingFrom, to: showingTo, domStart: 0}], changes);
        // Clip off the parts that won't be visible
        var intactLines = 0;
        for (var i = 0; i < intact.length; ++i) {
          var range = intact[i];
          if (range.from < from) {range.domStart += (from - range.from); range.from = from;}
          if (range.to > to) range.to = to;
          if (range.from >= range.to) intact.splice(i--, 1);
          else intactLines += range.to - range.from;
        }
        if (intactLines == to - from && from == showingFrom && to == showingTo) return;
        intact.sort(function(a, b) {return a.domStart - b.domStart;});
  
        var th = textHeight(), gutterDisplay = gutter.style.display;
        lineDiv.style.display = "none";
        patchDisplay(from, to, intact);
        lineDiv.style.display = gutter.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 || lastSizeC != scroller.clientHeight + th;
        // This is just a bogus formula that detects when the editor is
        // resized or the font size changes.
        if (different) lastSizeC = scroller.clientHeight + th;
        showingFrom = from; showingTo = to;
        displayOffset = heightAtLine(doc, from);
        mover.style.top = (displayOffset * th) + "px";
        if (scroller.clientHeight)
          code.style.height = (doc.height * th + 2 * paddingTop()) + "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(intact) + " size=" + (showingTo - showingFrom) +
                          " nodes=" + lineDiv.childNodes.length);
  
        function checkHeights() {
          maxWidth = scroller.clientWidth;
          var curNode = lineDiv.firstChild, heightChanged = false;
          doc.iter(showingFrom, showingTo, function(line) {
            if (!line.hidden) {
              var height = Math.round(curNode.offsetHeight / th) || 1;
              if (line.height != height) {
                updateLineHeight(line, height);
                gutterDirty = heightChanged = true;
              }
            }
            curNode = curNode.nextSibling;
          });
          if (heightChanged)
            code.style.height = (doc.height * th + 2 * paddingTop()) + "px";
          return heightChanged;
        }
  
        if (options.lineWrapping) {
          checkHeights();
        } else {
          if (maxWidth == null) maxWidth = stringWidth(maxLine);
          if (maxWidth > scroller.clientWidth) {
            lineSpace.style.width = maxWidth + "px";
            // Needed to prevent odd wrapping/hiding of widgets placed in here.
            code.style.width = "";
            code.style.width = scroller.scrollWidth + "px";
          } else {
            lineSpace.style.width = code.style.width = "";
          }
        }
  
        gutter.style.display = gutterDisplay;
        if (different || gutterDirty) {
          // If the gutter grew in size, re-check heights. If those changed, re-draw gutter.
          updateGutter() && options.lineWrapping && checkHeights() && updateGutter();
        }
        updateSelection();
        if (!suppressCallback && options.onUpdate) options.onUpdate(instance);
        return true;
      }
  
      function computeIntact(intact, changes) {
        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 && change.diff)
              intact2.push({from: range.from + diff, to: range.to + diff,
                            domStart: range.domStart});
            else if (change.to <= range.from || change.from >= range.to)
              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;
        }
        return intact;
      }
  
      function patchDisplay(from, to, intact) {
        // The first pass removes the DOM nodes that aren't intact.
        if (!intact.length) lineDiv.innerHTML = "";
        else {
          function killNode(node) {
            var tmp = node.nextSibling;
            node.parentNode.removeChild(node);
            return tmp;
          }
          var domPos = 0, curNode = lineDiv.firstChild, n;
          for (var i = 0; i < intact.length; ++i) {
            var cur = intact[i];
            while (cur.domStart > domPos) {curNode = killNode(curNode); domPos++;}
            for (var j = 0, e = cur.to - cur.from; j < e; ++j) {curNode = curNode.nextSibling; domPos++;}
          }
          while (curNode) curNode = killNode(curNode);
        }
        // This pass fills in the lines that actually changed.
        var nextIntact = intact.shift(), curNode = lineDiv.firstChild, j = from;
        var scratch = document.createElement("div");
        doc.iter(from, to, function(line) {
          if (nextIntact && nextIntact.to == j) nextIntact = intact.shift();
          if (!nextIntact || nextIntact.from > j) {
            if (line.hidden) var html = scratch.innerHTML = "<pre></pre>";
            else {
              var html = '<pre' + (line.className ? ' class="' + line.className + '"' : '') + '>'
                + line.getHTML(makeTab) + '</pre>';
              // Kludge to make sure the styled element lies behind the selection (by z-index)
              if (line.bgClassName)
                html = '<div style="position: relative"><pre class="' + line.bgClassName +
                '" style="position: absolute; left: 0; right: 0; top: 0; bottom: 0; z-index: -2">&#160;</pre>' + html + "</div>";
            }
            scratch.innerHTML = html;
            lineDiv.insertBefore(scratch.firstChild, curNode);
          } else {
            curNode = curNode.nextSibling;
          }
          ++j;
        });
      }
  
      function updateGutter() {
        if (!options.gutter && !options.lineNumbers) return;
        var hText = mover.offsetHeight, hEditor = scroller.clientHeight;
        gutter.style.height = (hText - hEditor < 2 ? hEditor : hText) + "px";
        var html = [], i = showingFrom, normalNode;
        doc.iter(showingFrom, Math.max(showingTo, showingFrom + 1), function(line) {
          if (line.hidden) {
            html.push("<pre></pre>");
          } else {
            var marker = line.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);
            for (var j = 1; j < line.height; ++j) html.push("<br/>&#160;");
            html.push("</pre>");
            if (!marker) normalNode = i;
          }
          ++i;
        });
        gutter.style.display = "none";
        gutterText.innerHTML = html.join("");
        // Make sure scrolling doesn't cause number gutter size to pop
        if (normalNode != null) {
          var node = gutterText.childNodes[normalNode - showingFrom];
          var minwidth = String(doc.size).length, val = eltText(node), pad = "";
          while (val.length + pad.length < minwidth) pad += "\u00a0";
          if (pad) node.insertBefore(document.createTextNode(pad), node.firstChild);
        }
        gutter.style.display = "";
        var resized = Math.abs((parseInt(lineSpace.style.marginLeft) || 0) - gutter.offsetWidth) > 2;
        lineSpace.style.marginLeft = gutter.offsetWidth + "px";
        gutterDirty = false;
        return resized;
      }
      function updateSelection() {
        var collapsed = posEq(sel.from, sel.to);
        var fromPos = localCoords(sel.from, true);
        var toPos = collapsed ? fromPos : localCoords(sel.to, true);
        var headPos = sel.inverted ? fromPos : toPos, th = textHeight();
        var wrapOff = eltOffset(wrapper), lineOff = eltOffset(lineDiv);
        inputDiv.style.top = Math.max(0, Math.min(scroller.offsetHeight, headPos.y + lineOff.top - wrapOff.top)) + "px";
        inputDiv.style.left = Math.max(0, Math.min(scroller.offsetWidth, headPos.x + lineOff.left - wrapOff.left)) + "px";
        if (collapsed) {
          cursor.style.top = headPos.y + "px";
          cursor.style.left = (options.lineWrapping ? Math.min(headPos.x, lineSpace.offsetWidth) : headPos.x) + "px";
          cursor.style.display = "";
          selectionDiv.style.display = "none";
        } else {
          var sameLine = fromPos.y == toPos.y, html = "";
          var clientWidth = lineSpace.clientWidth || lineSpace.offsetWidth;
          var clientHeight = lineSpace.clientHeight || lineSpace.offsetHeight;
          function add(left, top, right, height) {
            var rstyle = quirksMode ? "width: " + (!right ? clientWidth : clientWidth - right - left) + "px"
                                    : "right: " + right + "px";
            html += '<div class="CodeMirror-selected" style="position: absolute; left: ' + left +
              'px; top: ' + top + 'px; ' + rstyle + '; height: ' + height + 'px"></div>';
          }
          if (sel.from.ch && fromPos.y >= 0) {
            var right = sameLine ? clientWidth - toPos.x : 0;
            add(fromPos.x, fromPos.y, right, th);
          }
          var middleStart = Math.max(0, fromPos.y + (sel.from.ch ? th : 0));
          var middleHeight = Math.min(toPos.y, clientHeight) - middleStart;
          if (middleHeight > 0.2 * th)
            add(0, middleStart, 0, middleHeight);
          if ((!sameLine || !sel.from.ch) && toPos.y < clientHeight - .5 * th)
            add(0, toPos.y, clientWidth - toPos.x, th);
          selectionDiv.innerHTML = html;
          cursor.style.display = "none";
          selectionDiv.style.display = "";
        }
      }
  
      function setShift(val) {
        if (val) shiftSelecting = shiftSelecting || (sel.inverted ? sel.to : sel.from);
        else shiftSelecting = null;
      }
      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);
        userSelChange = true;
      }
      // 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) {
        goalColumn = null;
        if (oldFrom == null) {oldFrom = sel.from.line; oldTo = sel.to.line;}
        if (posEq(sel.from, from) && posEq(sel.to, to)) return;
        if (posLess(to, from)) {var tmp = to; to = from; from = tmp;}
  
        // Skip over hidden lines.
        if (from.line != oldFrom) {
          var from1 = skipHidden(from, oldFrom, sel.from.ch);
          // If there is no non-hidden line left, force visibility on current line
          if (!from1) setLineHidden(from.line, false);
          else from = from1;
        }
        if (to.line != oldTo) to = skipHidden(to, oldTo, sel.to.ch);
  
        if (posEq(from, to)) sel.inverted = false;
        else if (posEq(from, sel.to)) sel.inverted = false;
        else if (posEq(to, sel.from)) sel.inverted = true;
  
        if (options.autoClearEmptyLines && posEq(sel.from, sel.to)) {
          var head = sel.inverted ? from : to;
          if (head.line != sel.from.line && sel.from.line < doc.size) {
            var oldLine = getLine(sel.from.line);
            if (/^\s+$/.test(oldLine.text))
              setTimeout(operation(function() {
                if (oldLine.parent && /^\s+$/.test(oldLine.text)) {
                  var no = lineNo(oldLine);
                  replaceRange("", {line: no, ch: 0}, {line: no, ch: oldLine.text.length});
                }
              }, 10));
          }
        }
  
        sel.from = from; sel.to = to;
        selectionChanged = true;
      }
      function skipHidden(pos, oldLine, oldCh) {
        function getNonHidden(dir) {
          var lNo = pos.line + dir, end = dir == 1 ? doc.size : -1;
          while (lNo != end) {
            var line = getLine(lNo);
            if (!line.hidden) {
              var ch = pos.ch;
              if (toEnd || ch > oldCh || ch > line.text.length) ch = line.text.length;
              return {line: lNo, ch: ch};
            }
            lNo += dir;
          }
        }
        var line = getLine(pos.line);
        var toEnd = pos.ch == line.text.length && pos.ch != oldCh;
        if (!line.hidden) return pos;
        if (pos.line >= oldLine) return getNonHidden(1) || getNonHidden(-1);
        else return getNonHidden(-1) || getNonHidden(1);
      }
      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, doc.size-1));}
      function clipPos(pos) {
        if (pos.line < 0) return {line: 0, ch: 0};
        if (pos.line >= doc.size) return {line: doc.size-1, ch: getLine(doc.size-1).text.length};
        var ch = pos.ch, linelen = getLine(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 findPosH(dir, unit) {
        var end = sel.inverted ? sel.from : sel.to, line = end.line, ch = end.ch;
        var lineObj = getLine(line);
        function findNextLine() {
          for (var l = line + dir, e = dir < 0 ? -1 : doc.size; l != e; l += dir) {
            var lo = getLine(l);
            if (!lo.hidden) { line = l; lineObj = lo; return true; }
          }
        }
        function moveOnce(boundToLine) {
          if (ch == (dir < 0 ? 0 : lineObj.text.length)) {
            if (!boundToLine && findNextLine()) ch = dir < 0 ? lineObj.text.length : 0;
            else return false;
          } else ch += dir;
          return true;
        }
        if (unit == "char") moveOnce();
        else if (unit == "column") moveOnce(true);
        else if (unit == "word") {
          var sawWord = false;
          for (;;) {
            if (dir < 0) if (!moveOnce()) break;
            if (isWordChar(lineObj.text.charAt(ch))) sawWord = true;
            else if (sawWord) {if (dir < 0) {dir = 1; moveOnce();} break;}
            if (dir > 0) if (!moveOnce()) break;
          }
        }
        return {line: line, ch: ch};
      }
      function moveH(dir, unit) {
        var pos = dir < 0 ? sel.from : sel.to;
        if (shiftSelecting || posEq(sel.from, sel.to)) pos = findPosH(dir, unit);
        setCursor(pos.line, pos.ch, true);
      }
      function deleteH(dir, unit) {
        if (!posEq(sel.from, sel.to)) replaceRange("", sel.from, sel.to);
        else if (dir < 0) replaceRange("", findPosH(dir, unit), sel.to);
        else replaceRange("", sel.from, findPosH(dir, unit));
        userSelChange = true;
      }
      var goalColumn = null;
      function moveV(dir, unit) {
        var dist = 0, pos = localCoords(sel.inverted ? sel.from : sel.to, true);
        if (goalColumn != null) pos.x = goalColumn;
        if (unit == "page") dist = Math.min(scroller.clientHeight, window.innerHeight || document.documentElement.clientHeight);
        else if (unit == "line") dist = textHeight();
        var target = coordsChar(pos.x, pos.y + dist * dir + 2);
        if (unit == "page") scroller.scrollTop += localCoords(target, true).y - pos.y;
        setCursor(target.line, target.ch, true);
        goalColumn = pos.x;
      }
  
      function selectWordAt(pos) {
        var line = getLine(pos.line).text;
        var start = pos.ch, end = pos.ch;
        while (start > 0 && isWordChar(line.charAt(start - 1))) --start;
        while (end < line.length && isWordChar(line.charAt(end))) ++end;
        setSelectionUser({line: pos.line, ch: start}, {line: pos.line, ch: end});
      }
      function selectLine(line) {
        setSelectionUser({line: line, ch: 0}, clipPos({line: line + 1, ch: 0}));
      }
      function indentSelected(mode) {
        if (posEq(sel.from, sel.to)) return indentLine(sel.from.line, mode);
        var e = sel.to.line - (sel.to.ch ? 0 : 1);
        for (var i = sel.from.line; i <= e; ++i) indentLine(i, mode);
      }
  
      function indentLine(n, how) {
        if (!how) how = "add";
        if (how == "smart") {
          if (!mode.indent) how = "prev";
          else var state = getStateBefore(n);
        }
  
        var line = getLine(n), curSpace = line.indentation(options.tabSize),
            curSpaceString = line.text.match(/^\s*/)[0], indentation;
        if (how == "prev") {
          if (n) indentation = getLine(n-1).indentation(options.tabSize);
          else indentation = 0;
        }
        else if (how == "smart") indentation = mode.indent(state, line.text.slice(curSpaceString.length), line.text);
        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 / options.tabSize); i; --i) {pos += options.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);
        doc.iter(0, doc.size, function(line) { line.stateAfter = null; });
        work = [0];
        startWorker();
      }
      function gutterChanged() {
        var visible = options.gutter || options.lineNumbers;
        gutter.style.display = visible ? "" : "none";
        if (visible) gutterDirty = true;
        else lineDiv.parentNode.style.marginLeft = 0;
      }
      function wrappingChanged(from, to) {
        if (options.lineWrapping) {
          wrapper.className += " CodeMirror-wrap";
          var perLine = scroller.clientWidth / charWidth() - 3;
          doc.iter(0, doc.size, function(line) {
            if (line.hidden) return;
            var guess = Math.ceil(line.text.length / perLine) || 1;
            if (guess != 1) updateLineHeight(line, guess);
          });
          lineSpace.style.width = code.style.width = "";
        } else {
          wrapper.className = wrapper.className.replace(" CodeMirror-wrap", "");
          maxWidth = null; maxLine = "";
          doc.iter(0, doc.size, function(line) {
            if (line.height != 1 && !line.hidden) updateLineHeight(line, 1);
            if (line.text.length > maxLine.length) maxLine = line.text;
          });
        }
        changes.push({from: 0, to: doc.size});
      }
      function makeTab(col) {
        var w = options.tabSize - col % options.tabSize, cached = tabCache[w];
        if (cached) return cached;
        for (var str = '<span class="cm-tab">', i = 0; i < w; ++i) str += " ";
        return (tabCache[w] = {html: str + "</span>", width: w});
      }
      function themeChanged() {
        scroller.className = scroller.className.replace(/\s*cm-s-\S+/g, "") +
          options.theme.replace(/(^|\s)\s*/g, " cm-s-");
      }
      function keyMapChanged() {
        var style = keyMap[options.keyMap].style;
        wrapper.className = wrapper.className.replace(/\s*cm-keymap-\S+/g, "") +
          (style ? " cm-keymap-" + style : "");
      }
  
      function TextMarker() { this.set = []; }
      TextMarker.prototype.clear = operation(function() {
        var min = Infinity, max = -Infinity;
        for (var i = 0, e = this.set.length; i < e; ++i) {
          var line = this.set[i], mk = line.marked;
          if (!mk || !line.parent) continue;
          var lineN = lineNo(line);
          min = Math.min(min, lineN); max = Math.max(max, lineN);
          for (var j = 0; j < mk.length; ++j)
            if (mk[j].marker == this) mk.splice(j--, 1);
        }
        if (min != Infinity)
          changes.push({from: min, to: max + 1});
      });
      TextMarker.prototype.find = function() {
        var from, to;
        for (var i = 0, e = this.set.length; i < e; ++i) {
          var line = this.set[i], mk = line.marked;
          for (var j = 0; j < mk.length; ++j) {
            var mark = mk[j];
            if (mark.marker == this) {
              if (mark.from != null || mark.to != null) {
                var found = lineNo(line);
                if (found != null) {
                  if (mark.from != null) from = {line: found, ch: mark.from};
                  if (mark.to != null) to = {line: found, ch: mark.to};
                }
              }
            }
          }
        }
        return {from: from, to: to};
      };
  
      function markText(from, to, className) {
        from = clipPos(from); to = clipPos(to);
        var tm = new TextMarker();
        if (!posLess(from, to)) return tm;
        function add(line, from, to, className) {
          getLine(line).addMark(new MarkedText(from, to, className, tm));
        }
        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, null, null, className);
          add(to.line, null, to.ch, className);
        }
        changes.push({from: from.line, to: to.line + 1});
        return tm;
      }
  
      function setBookmark(pos) {
        pos = clipPos(pos);
        var bm = new Bookmark(pos.ch);
        getLine(pos.line).addMark(bm);
        return bm;
      }
  
      function findMarksAt(pos) {
        pos = clipPos(pos);
        var markers = [], marked = getLine(pos.line).marked;
        if (!marked) return markers;
        for (var i = 0, e = marked.length; i < e; ++i) {
          var m = marked[i];
          if ((m.from == null || m.from <= pos.ch) &&
              (m.to == null || m.to >= pos.ch))
            markers.push(m.marker || m);
        }
        return markers;
      }
  
      function addGutterMarker(line, text, className) {
        if (typeof line == "number") line = getLine(clipLine(line));
        line.gutterMarker = {text: text, style: className};
        gutterDirty = true;
        return line;
      }
      function removeGutterMarker(line) {
        if (typeof line == "number") line = getLine(clipLine(line));
        line.gutterMarker = null;
        gutterDirty = true;
      }
  
      function changeLine(handle, op) {
        var no = handle, line = handle;
        if (typeof handle == "number") line = getLine(clipLine(handle));
        else no = lineNo(handle);
        if (no == null) return null;
        if (op(line, no)) changes.push({from: no, to: no + 1});
        else return null;
        return line;
      }
      function setLineClass(handle, className, bgClassName) {
        return changeLine(handle, function(line) {
          if (line.className != className || line.bgClassName != bgClassName) {
            line.className = className;
            line.bgClassName = bgClassName;
            return true;
          }
        });
      }
      function setLineHidden(handle, hidden) {
        return changeLine(handle, function(line, no) {
          if (line.hidden != hidden) {
            line.hidden = hidden;
            if (!options.lineWrapping) {
              var l = line.text;
              if (hidden && l.length == maxLine.length) {
                maxLengthChanged = true;
              }
              else if (!hidden && l.length > maxLine.length) {
                maxLine = l; maxWidth = null;
                maxLengthChanged = false;
              }
            }
            updateLineHeight(line, hidden ? 0 : 1);
            var fline = sel.from.line, tline = sel.to.line;
            if (hidden && (fline == no || tline == no)) {
              var from = fline == no ? skipHidden({line: fline, ch: 0}, fline, 0) : sel.from;
              var to = tline == no ? skipHidden({line: tline, ch: 0}, tline, 0) : sel.to;
              // Can't hide the last visible line, we'd have no place to put the cursor
              if (!to) return;
              setSelection(from, to);
            }
            return (gutterDirty = true);
          }
        });
      }
  
      function lineInfo(line) {
        if (typeof line == "number") {
          if (!isLine(line)) return null;
          var n = line;
          line = getLine(line);
          if (!line) return null;
        }
        else {
          var n = lineNo(line);
          if (n == null) return null;
        }
        var marker = line.gutterMarker;
        return {line: n, handle: line, text: line.text, markerText: marker && marker.text,
                markerClass: marker && marker.style, lineClass: line.className, bgClass: line.bgClassName};
      }
  
      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 charFromX(line, x) {
        if (x <= 0) return 0;
        var lineObj = getLine(line), text = lineObj.text;
        function getX(len) {
          return measureLine(lineObj, len).left;
        }
        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 / charWidth()));
        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;}
        }
      }
  
      var tempId = "CodeMirror-temp-" + Math.floor(Math.random() * 0xffffff).toString(16);
      function measureLine(line, ch) {
        if (ch == 0) return {top: 0, left: 0};
        var wbr = options.lineWrapping && ch < line.text.length &&
                  spanAffectsWrapping.test(line.text.slice(ch - 1, ch + 1));
        measure.innerHTML = "<pre>" + line.getHTML(makeTab, ch, tempId, wbr) + "</pre>";
        var elt = document.getElementById(tempId);
        var top = elt.offsetTop, left = elt.offsetLeft;
        // Older IEs report zero offsets for spans directly after a wrap
        if (ie && top == 0 && left == 0) {
          var backup = document.createElement("span");
          backup.innerHTML = "x";
          elt.parentNode.insertBefore(backup, elt.nextSibling);
          top = backup.offsetTop;
        }
        return {top: top, left: left};
      }
      function localCoords(pos, inLineWrap) {
        var x, lh = textHeight(), y = lh * (heightAtLine(doc, pos.line) - (inLineWrap ? displayOffset : 0));
        if (pos.ch == 0) x = 0;
        else {
          var sp = measureLine(getLine(pos.line), pos.ch);
          x = sp.left;
          if (options.lineWrapping) y += Math.max(0, sp.top);
        }
        return {x: x, y: y, yBot: y + lh};
      }
      // Coords must be lineSpace-local
      function coordsChar(x, y) {
        if (y < 0) y = 0;
        var th = textHeight(), cw = charWidth(), heightPos = displayOffset + Math.floor(y / th);
        var lineNo = lineAtHeight(doc, heightPos);
        if (lineNo >= doc.size) return {line: doc.size - 1, ch: getLine(doc.size - 1).text.length};
        var lineObj = getLine(lineNo), text = lineObj.text;
        var tw = options.lineWrapping, innerOff = tw ? heightPos - heightAtLine(doc, lineNo) : 0;
        if (x <= 0 && innerOff == 0) return {line: lineNo, ch: 0};
        function getX(len) {
          var sp = measureLine(lineObj, len);
          if (tw) {
            var off = Math.round(sp.top / th);
            return Math.max(0, sp.left + (off - innerOff) * scroller.clientWidth);
          }
          return sp.left;
        }
        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 + innerOff * scroller.clientWidth * .9) / cw));
        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 {line: lineNo, ch: 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 {line: lineNo, ch: (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 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};
      }
  
      var cachedHeight, cachedHeightFor, measureText;
      function textHeight() {
        if (measureText == null) {
          measureText = "<pre>";
          for (var i = 0; i < 49; ++i) measureText += "x<br/>";
          measureText += "x</pre>";
        }
        var offsetHeight = lineDiv.clientHeight;
        if (offsetHeight == cachedHeightFor) return cachedHeight;
        cachedHeightFor = offsetHeight;
        measure.innerHTML = measureText;
        cachedHeight = measure.firstChild.offsetHeight / 50 || 1;
        measure.innerHTML = "";
        return cachedHeight;
      }
      var cachedWidth, cachedWidthFor = 0;
      function charWidth() {
        if (scroller.clientWidth == cachedWidthFor) return cachedWidth;
        cachedWidthFor = scroller.clientWidth;
        return (cachedWidth = stringWidth("x"));
      }
      function paddingTop() {return lineSpace.offsetTop;}
      function paddingLeft() {return lineSpace.offsetLeft;}
  
      function posFromMouse(e, liberal) {
        var offW = eltOffset(scroller, true), x, y;
        // Fails unpredictably on IE[67] when mouse is dragged around quickly.
        try { x = e.clientX; y = e.clientY; } catch (e) { return null; }
        // 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 > scroller.clientWidth || y - offW.top > scroller.clientHeight))
          return null;
        var offL = eltOffset(lineSpace, true);
        return coordsChar(x - offL.left, y - offL.top);
      }
      function onContextMenu(e) {
        var pos = posFromMouse(e), scrollPos = scroller.scrollTop;
        if (!pos || window.opera) return; // Opera is difficult.
        if (posEq(sel.from, sel.to) || posLess(pos, sel.from) || !posLess(pos, sel.to))
          operation(setCursor)(pos.line, pos.ch);
  
        var oldCSS = input.style.cssText;
        inputDiv.style.position = "absolute";
        input.style.cssText = "position: fixed; width: 30px; height: 30px; top: " + (e.clientY - 5) +
          "px; left: " + (e.clientX - 5) + "px; z-index: 1000; background: white; " +
          "border-width: 0; outline: none; overflow: hidden; opacity: .05; filter: alpha(opacity=5);";
        leaveInputAlone = true;
        var val = input.value = getSelection();
        focusInput();
        selectInput(input);
        function rehide() {
          var newVal = splitLines(input.value).join("\n");
          if (newVal != val) operation(replaceSelection)(newVal, "end");
          inputDiv.style.position = "relative";
          input.style.cssText = oldCSS;
          if (ie_lt9) scroller.scrollTop = scrollPos;
          leaveInputAlone = false;
          resetInput(true);
          slowPoll();
        }
  
        if (gecko) {
          e_stop(e);
          var mouseup = connect(window, "mouseup", function() {
            mouseup();
            setTimeout(rehide, 20);
          }, true);
        } else {
          setTimeout(rehide, 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 = getLine(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 + 100, doc.size) : Math.max(-1, i - 100); i != e; i+=d) {
          var line = getLine(i), first = i == head.line;
          var found = scan(line, first && forward ? pos + 1 : 0, first && !forward ? pos : line.text.length);
          if (found) break;
        }
        if (!found) found = {pos: null, match: false};
        var style = found.match ? "CodeMirror-matchingbracket" : "CodeMirror-nonmatchingbracket";
        var one = markText({line: head.line, ch: pos}, {line: head.line, ch: pos+1}, style),
            two = found.pos != null && markText({line: i, ch: found.pos}, {line: i, ch: found.pos + 1}, style);
        var clear = operation(function(){one.clear(); two && two.clear();});
        if (autoclear) setTimeout(clear, 800);
        else bracketHighlighted = clear;
      }
  
      // 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 = getLine(search-1);
          if (line.stateAfter) return search;
          var indented = line.indentation(options.tabSize);
          if (minline == null || minindent > indented) {
            minline = search - 1;
            minindent = indented;
          }
        }
        return minline;
      }
      function getStateBefore(n) {
        var start = findStartLine(n), state = start && getLine(start-1).stateAfter;
        if (!state) state = startState(mode);
        else state = copyState(mode, state);
        doc.iter(start, n, function(line) {
          line.highlight(mode, state, options.tabSize);
          line.stateAfter = copyState(mode, state);
        });
        if (start < n) changes.push({from: start, to: n});
        if (n < doc.size && !getLine(n).stateAfter) work.push(n);
        return state;
      }
      function highlightLines(start, end) {
        var state = getStateBefore(start);
        doc.iter(start, end, function(line) {
          line.highlight(mode, state, options.tabSize);
          line.stateAfter = copyState(mode, state);
        });
      }
      function highlightWorker() {
        var end = +new Date + options.workTime;
        var foundWork = work.length;
        while (work.length) {
          if (!getLine(showingFrom).stateAfter) var task = showingFrom;
          else var task = work.pop();
          if (task >= doc.size) continue;
          var start = findStartLine(task), state = start && getLine(start-1).stateAfter;
          if (state) state = copyState(mode, state);
          else state = startState(mode);
  
          var unchanged = 0, compare = mode.compareStates, realChange = false,
              i = start, bail = false;
          doc.iter(i, doc.size, function(line) {
            var hadState = line.stateAfter;
            if (+new Date > end) {
              work.push(i);
              startWorker(options.workDelay);
              if (realChange) changes.push({from: task, to: i + 1});
              return (bail = true);
            }
            var changed = line.highlight(mode, state, options.tabSize);
            if (changed) realChange = true;
            line.stateAfter = copyState(mode, state);
            var done = null;
            if (compare) {
              var same = hadState && compare(hadState, state);
              if (same != Pass) done = !!same;
            }
            if (done == null) {
              if (changed !== false || !hadState) unchanged = 0;
              else if (++unchanged > 3 && (!mode.indent || mode.indent(hadState, "") == mode.indent(state, "")))
                done = true;
            }
            if (done) return true;
            ++i;
          });
          if (bail) return;
          if (realChange) changes.push({from: task, to: i + 1});
        }
        if (foundWork && options.onHighlightComplete)
          options.onHighlightComplete(instance);
      }
      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 = userSelChange = textChanged = null;
        changes = []; selectionChanged = false; callbacks = [];
      }
      function endOperation() {
        var reScroll = false, updated;
        if (maxLengthChanged) computeMaxLength();
        if (selectionChanged) reScroll = !scrollCursorIntoView();
        if (changes.length) updated = updateDisplay(changes, true);
        else {
          if (selectionChanged) updateSelection();
          if (gutterDirty) updateGutter();
        }
        if (reScroll) scrollCursorIntoView();
        if (selectionChanged) {scrollEditorIntoView(); restartBlink();}
  
        if (focused && !leaveInputAlone &&
            (updateInput === true || (updateInput !== false && selectionChanged)))
          resetInput(userSelChange);
  
        if (selectionChanged && options.matchBrackets)
          setTimeout(operation(function() {
            if (bracketHighlighted) {bracketHighlighted(); bracketHighlighted = null;}
            if (posEq(sel.from, sel.to)) matchBrackets(false);
          }), 20);
        var tc = textChanged, cbs = callbacks; // these can be reset by callbacks
        if (selectionChanged && options.onCursorActivity)
          options.onCursorActivity(instance);
        if (tc && options.onChange && instance)
          options.onChange(instance, tc);
        for (var i = 0; i < cbs.length; ++i) cbs[i](instance);
        if (updated && options.onUpdate) options.onUpdate(instance);
      }
      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 compoundChange(f) {
        history.startCompound();
        try { return f(); } finally { history.endCompound(); }
      }
  
      for (var ext in extensions)
        if (extensions.propertyIsEnumerable(ext) &&
            !instance.propertyIsEnumerable(ext))
          instance[ext] = extensions[ext];
      return instance;
    } // (end of function CodeMirror)
  
    // The default configuration options.
    CodeMirror.defaults = {
      value: "",
      mode: null,
      theme: "default",
      indentUnit: 2,
      indentWithTabs: false,
      smartIndent: true,
      tabSize: 4,
      keyMap: "default",
      extraKeys: null,
      electricChars: true,
      autoClearEmptyLines: false,
      onKeyEvent: null,
      onDragEvent: null,
      lineWrapping: false,
      lineNumbers: false,
      gutter: false,
      fixedGutter: false,
      firstLineNumber: 1,
      readOnly: false,
      dragDrop: true,
      onChange: null,
      onCursorActivity: null,
      onGutterClick: null,
      onHighlightComplete: null,
      onUpdate: null,
      onFocus: null, onBlur: null, onScroll: null,
      matchBrackets: false,
      workTime: 100,
      workDelay: 200,
      pollInterval: 100,
      undoDepth: 40,
      tabindex: null,
      autofocus: null
    };
  
    var ios = /AppleWebKit/.test(navigator.userAgent) && /Mobile\/\w+/.test(navigator.userAgent);
    var mac = ios || /Mac/.test(navigator.platform);
    var win = /Win/.test(navigator.platform);
  
    // Known modes, by name and by MIME
    var modes = CodeMirror.modes = {}, mimeModes = CodeMirror.mimeModes = {};
    CodeMirror.defineMode = function(name, mode) {
      if (!CodeMirror.defaults.mode && name != "null") CodeMirror.defaults.mode = name;
      if (arguments.length > 2) {
        mode.dependencies = [];
        for (var i = 2; i < arguments.length; ++i) mode.dependencies.push(arguments[i]);
      }
      modes[name] = mode;
    };
    CodeMirror.defineMIME = function(mime, spec) {
      mimeModes[mime] = spec;
    };
    CodeMirror.resolveMode = function(spec) {
      if (typeof spec == "string" && mimeModes.hasOwnProperty(spec))
        spec = mimeModes[spec];
      else if (typeof spec == "string" && /^[\w\-]+\/[\w\-]+\+xml$/.test(spec))
        return CodeMirror.resolveMode("application/xml");
      if (typeof spec == "string") return {name: spec};
      else return spec || {name: "null"};
    };
    CodeMirror.getMode = function(options, spec) {
      var spec = CodeMirror.resolveMode(spec);
      var mfactory = modes[spec.name];
      if (!mfactory) return CodeMirror.getMode(options, "text/plain");
      return mfactory(options, spec);
    };
    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({mime: m, mode: mimeModes[m]});
      return list;
    };
  
    var extensions = CodeMirror.extensions = {};
    CodeMirror.defineExtension = function(name, func) {
      extensions[name] = func;
    };
  
    var commands = CodeMirror.commands = {
      selectAll: function(cm) {cm.setSelection({line: 0, ch: 0}, {line: cm.lineCount() - 1});},
      killLine: function(cm) {
        var from = cm.getCursor(true), to = cm.getCursor(false), sel = !posEq(from, to);
        if (!sel && cm.getLine(from.line).length == from.ch) cm.replaceRange("", from, {line: from.line + 1, ch: 0});
        else cm.replaceRange("", from, sel ? to : {line: from.line});
      },
      deleteLine: function(cm) {var l = cm.getCursor().line; cm.replaceRange("", {line: l, ch: 0}, {line: l});},
      undo: function(cm) {cm.undo();},
      redo: function(cm) {cm.redo();},
      goDocStart: function(cm) {cm.setCursor(0, 0, true);},
      goDocEnd: function(cm) {cm.setSelection({line: cm.lineCount() - 1}, null, true);},
      goLineStart: function(cm) {cm.setCursor(cm.getCursor().line, 0, true);},
      goLineStartSmart: function(cm) {
        var cur = cm.getCursor();
        var text = cm.getLine(cur.line), firstNonWS = Math.max(0, text.search(/\S/));
        cm.setCursor(cur.line, cur.ch <= firstNonWS && cur.ch ? 0 : firstNonWS, true);
      },
      goLineEnd: function(cm) {cm.setSelection({line: cm.getCursor().line}, null, true);},
      goLineUp: function(cm) {cm.moveV(-1, "line");},
      goLineDown: function(cm) {cm.moveV(1, "line");},
      goPageUp: function(cm) {cm.moveV(-1, "page");},
      goPageDown: function(cm) {cm.moveV(1, "page");},
      goCharLeft: function(cm) {cm.moveH(-1, "char");},
      goCharRight: function(cm) {cm.moveH(1, "char");},
      goColumnLeft: function(cm) {cm.moveH(-1, "column");},
      goColumnRight: function(cm) {cm.moveH(1, "column");},
      goWordLeft: function(cm) {cm.moveH(-1, "word");},
      goWordRight: function(cm) {cm.moveH(1, "word");},
      delCharLeft: function(cm) {cm.deleteH(-1, "char");},
      delCharRight: function(cm) {cm.deleteH(1, "char");},
      delWordLeft: function(cm) {cm.deleteH(-1, "word");},
      delWordRight: function(cm) {cm.deleteH(1, "word");},
      indentAuto: function(cm) {cm.indentSelection("smart");},
      indentMore: function(cm) {cm.indentSelection("add");},
      indentLess: function(cm) {cm.indentSelection("subtract");},
      insertTab: function(cm) {cm.replaceSelection("\t", "end");},
      defaultTab: function(cm) {
        if (cm.somethingSelected()) cm.indentSelection("add");
        else cm.replaceSelection("\t", "end");
      },
      transposeChars: function(cm) {
        var cur = cm.getCursor(), line = cm.getLine(cur.line);
        if (cur.ch > 0 && cur.ch < line.length - 1)
          cm.replaceRange(line.charAt(cur.ch) + line.charAt(cur.ch - 1),
                          {line: cur.line, ch: cur.ch - 1}, {line: cur.line, ch: cur.ch + 1});
      },
      newlineAndIndent: function(cm) {
        cm.replaceSelection("\n", "end");
        cm.indentLine(cm.getCursor().line);
      },
      toggleOverwrite: function(cm) {cm.toggleOverwrite();}
    };
  
    var keyMap = CodeMirror.keyMap = {};
    keyMap.basic = {
      "Left": "goCharLeft", "Right": "goCharRight", "Up": "goLineUp", "Down": "goLineDown",
      "End": "goLineEnd", "Home": "goLineStartSmart", "PageUp": "goPageUp", "PageDown": "goPageDown",
      "Delete": "delCharRight", "Backspace": "delCharLeft", "Tab": "defaultTab", "Shift-Tab": "indentAuto",
      "Enter": "newlineAndIndent", "Insert": "toggleOverwrite"
    };
    // Note that the save and find-related commands aren't defined by
    // default. Unknown commands are simply ignored.
    keyMap.pcDefault = {
      "Ctrl-A": "selectAll", "Ctrl-D": "deleteLine", "Ctrl-Z": "undo", "Shift-Ctrl-Z": "redo", "Ctrl-Y": "redo",
      "Ctrl-Home": "goDocStart", "Alt-Up": "goDocStart", "Ctrl-End": "goDocEnd", "Ctrl-Down": "goDocEnd",
      "Ctrl-Left": "goWordLeft", "Ctrl-Right": "goWordRight", "Alt-Left": "goLineStart", "Alt-Right": "goLineEnd",
      "Ctrl-Backspace": "delWordLeft", "Ctrl-Delete": "delWordRight", "Ctrl-S": "save", "Ctrl-F": "find",
      "Ctrl-G": "findNext", "Shift-Ctrl-G": "findPrev", "Shift-Ctrl-F": "replace", "Shift-Ctrl-R": "replaceAll",
      "Ctrl-[": "indentLess", "Ctrl-]": "indentMore",
      fallthrough: "basic"
    };
    keyMap.macDefault = {
      "Cmd-A": "selectAll", "Cmd-D": "deleteLine", "Cmd-Z": "undo", "Shift-Cmd-Z": "redo", "Cmd-Y": "redo",
      "Cmd-Up": "goDocStart", "Cmd-End": "goDocEnd", "Cmd-Down": "goDocEnd", "Alt-Left": "goWordLeft",
      "Alt-Right": "goWordRight", "Cmd-Left": "goLineStart", "Cmd-Right": "goLineEnd", "Alt-Backspace": "delWordLeft",
      "Ctrl-Alt-Backspace": "delWordRight", "Alt-Delete": "delWordRight", "Cmd-S": "save", "Cmd-F": "find",
      "Cmd-G": "findNext", "Shift-Cmd-G": "findPrev", "Cmd-Alt-F": "replace", "Shift-Cmd-Alt-F": "replaceAll",
      "Cmd-[": "indentLess", "Cmd-]": "indentMore",
      fallthrough: ["basic", "emacsy"]
    };
    keyMap["default"] = mac ? keyMap.macDefault : keyMap.pcDefault;
    keyMap.emacsy = {
      "Ctrl-F": "goCharRight", "Ctrl-B": "goCharLeft", "Ctrl-P": "goLineUp", "Ctrl-N": "goLineDown",
      "Alt-F": "goWordRight", "Alt-B": "goWordLeft", "Ctrl-A": "goLineStart", "Ctrl-E": "goLineEnd",
      "Ctrl-V": "goPageUp", "Shift-Ctrl-V": "goPageDown", "Ctrl-D": "delCharRight", "Ctrl-H": "delCharLeft",
      "Alt-D": "delWordRight", "Alt-Backspace": "delWordLeft", "Ctrl-K": "killLine", "Ctrl-T": "transposeChars"
    };
  
    function getKeyMap(val) {
      if (typeof val == "string") return keyMap[val];
      else return val;
    }
    function lookupKey(name, extraMap, map, handle, stop) {
      function lookup(map) {
        map = getKeyMap(map);
        var found = map[name];
        if (found != null && handle(found)) return true;
        if (map.nofallthrough) {
          if (stop) stop();
          return true;
        }
        var fallthrough = map.fallthrough;
        if (fallthrough == null) return false;
        if (Object.prototype.toString.call(fallthrough) != "[object Array]")
          return lookup(fallthrough);
        for (var i = 0, e = fallthrough.length; i < e; ++i) {
          if (lookup(fallthrough[i])) return true;
        }
        return false;
      }
      if (extraMap && lookup(extraMap)) return true;
      return lookup(map);
    }
    function isModifierKey(event) {
      var name = keyNames[e_prop(event, "keyCode")];
      return name == "Ctrl" || name == "Alt" || name == "Shift" || name == "Mod";
    }
  
    CodeMirror.fromTextArea = function(textarea, options) {
      if (!options) options = {};
      options.value = textarea.value;
      if (!options.tabindex && textarea.tabindex)
        options.tabindex = textarea.tabindex;
      if (options.autofocus == null && textarea.getAttribute("autofocus") != null)
        options.autofocus = true;
  
      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.getTextArea = function() { return textarea; };
      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.copyState = copyState;
    function startState(mode, a1, a2) {
      return mode.startState ? mode.startState(a1, a2) : true;
    }
    CodeMirror.startState = startState;
  
    // The character stream used by a mode's parser.
    function StringStream(string, tabSize) {
      this.pos = this.start = 0;
      this.string = string;
      this.tabSize = tabSize || 8;
    }
    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.pos;
        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, this.tabSize);},
      indentation: function() {return countColumn(this.string, null, this.tabSize);},
      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);}
    };
    CodeMirror.StringStream = StringStream;
  
    function MarkedText(from, to, className, marker) {
      this.from = from; this.to = to; this.style = className; this.marker = marker;
    }
    MarkedText.prototype = {
      attach: function(line) { this.marker.set.push(line); },
      detach: function(line) {
        var ix = indexOf(this.marker.set, line);
        if (ix > -1) this.marker.set.splice(ix, 1);
      },
      split: function(pos, lenBefore) {
        if (this.to <= pos && this.to != null) return null;
        var from = this.from < pos || this.from == null ? null : this.from - pos + lenBefore;
        var to = this.to == null ? null : this.to - pos + lenBefore;
        return new MarkedText(from, to, this.style, this.marker);
      },
      dup: function() { return new MarkedText(null, null, this.style, this.marker); },
      clipTo: function(fromOpen, from, toOpen, to, diff) {
        if (fromOpen && to > this.from && (to < this.to || this.to == null))
          this.from = null;
        else if (this.from != null && this.from >= from)
          this.from = Math.max(to, this.from) + diff;
        if (toOpen && (from < this.to || this.to == null) && (from > this.from || this.from == null))
          this.to = null;
        else if (this.to != null && this.to > from)
          this.to = to < this.to ? this.to + diff : from;
      },
      isDead: function() { return this.from != null && this.to != null && this.from >= this.to; },
      sameSet: function(x) { return this.marker == x.marker; }
    };
  
    function Bookmark(pos) {
      this.from = pos; this.to = pos; this.line = null;
    }
    Bookmark.prototype = {
      attach: function(line) { this.line = line; },
      detach: function(line) { if (this.line == line) this.line = null; },
      split: function(pos, lenBefore) {
        if (pos < this.from) {
          this.from = this.to = (this.from - pos) + lenBefore;
          return this;
        }
      },
      isDead: function() { return this.from > this.to; },
      clipTo: function(fromOpen, from, toOpen, to, diff) {
        if ((fromOpen || from < this.from) && (toOpen || to > this.to)) {
          this.from = 0; this.to = -1;
        } else if (this.from > from) {
          this.from = this.to = Math.max(to, this.from) + diff;
        }
      },
      sameSet: function(x) { return false; },
      find: function() {
        if (!this.line || !this.line.parent) return null;
        return {line: lineNo(this.line), ch: this.from};
      },
      clear: function() {
        if (this.line) {
          var found = indexOf(this.line.marked, this);
          if (found != -1) this.line.marked.splice(found, 1);
          this.line = null;
        }
      }
    };
  
    // 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.text = text;
      this.height = 1;
      this.marked = this.gutterMarker = this.className = this.bgClassName = this.handlers = null;
      this.stateAfter = this.parent = this.hidden = null;
    }
    Line.inheritMarks = function(text, orig) {
      var ln = new Line(text), mk = orig && orig.marked;
      if (mk) {
        for (var i = 0; i < mk.length; ++i) {
          if (mk[i].to == null && mk[i].style) {
            var newmk = ln.marked || (ln.marked = []), mark = mk[i];
            var nmark = mark.dup(); newmk.push(nmark); nmark.attach(ln);
          }
        }
      }
      return ln;
    }
    Line.prototype = {
      // Replace a piece of a line, keeping the styles around it intact.
      replace: function(from, to_, text) {
        var st = [], mk = this.marked, to = to_ == null ? this.text.length : to_;
        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);
          for (var i = 0; i < mk.length; ++i) {
            var mark = mk[i];
            mark.clipTo(from == null, from || 0, to_ == null, to, diff);
            if (mark.isDead()) {mark.detach(this); mk.splice(i--, 1);}
          }
        }
      },
      // Split a part off a line, keeping styles and markers intact.
      split: function(pos, textBefore) {
        var st = [textBefore, null], mk = this.marked;
        copyStyles(pos, this.text.length, this.styles, st);
        var taken = new Line(textBefore + this.text.slice(pos), st);
        if (mk) {
          for (var i = 0; i < mk.length; ++i) {
            var mark = mk[i];
            var newmark = mark.split(pos, textBefore.length);
            if (newmark) {
              if (!taken.marked) taken.marked = [];
              taken.marked.push(newmark); newmark.attach(taken);
              if (newmark == mark) mk.splice(i--, 1);
            }
          }
        }
        return taken;
      },
      append: function(line) {
        var mylen = this.text.length, mk = line.marked, mymk = this.marked;
        this.text += line.text;
        copyStyles(0, line.text.length, line.styles, this.styles);
        if (mymk) {
          for (var i = 0; i < mymk.length; ++i)
            if (mymk[i].to == null) mymk[i].to = mylen;
        }
        if (mk && mk.length) {
          if (!mymk) this.marked = mymk = [];
          outer: for (var i = 0; i < mk.length; ++i) {
            var mark = mk[i];
            if (!mark.from) {
              for (var j = 0; j < mymk.length; ++j) {
                var mymark = mymk[j];
                if (mymark.to == mylen && mymark.sameSet(mark)) {
                  mymark.to = mark.to == null ? null : mark.to + mylen;
                  if (mymark.isDead()) {
                    mymark.detach(this);
                    mk.splice(i--, 1);
                  }
                  continue outer;
                }
              }
            }
            mymk.push(mark);
            mark.attach(this);
            mark.from += mylen;
            if (mark.to != null) mark.to += mylen;
          }
        }
      },
      fixMarkEnds: function(other) {
        var mk = this.marked, omk = other.marked;
        if (!mk) return;
        for (var i = 0; i < mk.length; ++i) {
          var mark = mk[i], close = mark.to == null;
          if (close && omk) {
            for (var j = 0; j < omk.length; ++j)
              if (omk[j].sameSet(mark)) {close = false; break;}
          }
          if (close) mark.to = this.text.length;
        }
      },
      fixMarkStarts: function() {
        var mk = this.marked;
        if (!mk) return;
        for (var i = 0; i < mk.length; ++i)
          if (mk[i].from == null) mk[i].from = 0;
      },
      addMark: function(mark) {
        mark.attach(this);
        if (this.marked == null) this.marked = [];
        this.marked.push(mark);
        this.marked.sort(function(a, b){return (a.from || 0) - (b.from || 0);});
      },
      // 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, tabSize) {
        var stream = new StringStream(this.text, tabSize), st = this.styles, pos = 0;
        var changed = false, curWord = st[0], prevWord;
        if (this.text == "" && mode.blankLine) mode.blankLine(state);
        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;
        // Short lines with simple highlights return null, and are
        // counted as changed by the driver because they are likely to
        // highlight the same way in various contexts.
        return changed || (st.length < 5 && this.text.length < 10 ? null : false);
      },
      // 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(tabSize) {return countColumn(this.text, null, tabSize);},
      // Produces an HTML fragment for the line, taking selection,
      // marking, and highlighting into account.
      getHTML: function(makeTab, wrapAt, wrapId, wrapWBR) {
        var html = [], first = true, col = 0;
        function span_(text, style) {
          if (!text) return;
          // Work around a bug where, in some compat modes, IE ignores leading spaces
          if (first && ie && text.charAt(0) == " ") text = "\u00a0" + text.slice(1);
          first = false;
          if (text.indexOf("\t") == -1) {
            col += text.length;
            var escaped = htmlEscape(text);
          } else {
            var escaped = "";
            for (var pos = 0;;) {
              var idx = text.indexOf("\t", pos);
              if (idx == -1) {
                escaped += htmlEscape(text.slice(pos));
                col += text.length - pos;
                break;
              } else {
                col += idx - pos;
                var tab = makeTab(col);
                escaped += htmlEscape(text.slice(pos, idx)) + tab.html;
                col += tab.width;
                pos = idx + 1;
              }
            }
          }
          if (style) html.push('<span class="', style, '">', escaped, "</span>");
          else html.push(escaped);
        }
        var span = span_;
        if (wrapAt != null) {
          var outPos = 0, open = "<span id=\"" + wrapId + "\">";
          span = function(text, style) {
            var l = text.length;
            if (wrapAt >= outPos && wrapAt < outPos + l) {
              if (wrapAt > outPos) {
                span_(text.slice(0, wrapAt - outPos), style);
                // See comment at the definition of spanAffectsWrapping
                if (wrapWBR) html.push("<wbr>");
              }
              html.push(open);
              var cut = wrapAt - outPos;
              span_(window.opera ? text.slice(cut, cut + 1) : text.slice(cut), style);
              html.push("</span>");
              if (window.opera) span_(text.slice(cut + 1), style);
              wrapAt--;
              outPos += l;
            } else {
              outPos += l;
              span_(text, style);
              // Output empty wrapper when at end of line
              if (outPos == wrapAt && outPos == len) html.push(open + " </span>");
              // Stop outputting HTML when gone sufficiently far beyond measure
              else if (outPos > wrapAt + 10 && /\s/.test(text)) span = function(){};
            }
          }
        }
  
        var st = this.styles, allText = this.text, marked = this.marked;
        var len = allText.length;
        function styleToClass(style) {
          if (!style) return null;
          return "cm-" + style.replace(/ +/g, " cm-");
        }
  
        if (!allText && wrapAt == null) {
          span(" ");
        } else if (!marked || !marked.length) {
          for (var i = 0, ch = 0; ch < len; i+=2) {
            var str = st[i], style = st[i+1], l = str.length;
            if (ch + l > len) str = str.slice(0, len - ch);
            ch += l;
            span(str, styleToClass(style));
          }
        } else {
          var pos = 0, i = 0, text = "", style, sg = 0;
          var nextChange = marked[0].from || 0, marks = [], markpos = 0;
          function advanceMarks() {
            var m;
            while (markpos < marked.length &&
                   ((m = marked[markpos]).from == pos || m.from == null)) {
              if (m.style != null) marks.push(m);
              ++markpos;
            }
            nextChange = markpos < marked.length ? marked[markpos].from : Infinity;
            for (var i = 0; i < marks.length; ++i) {
              var to = marks[i].to || Infinity;
              if (to == pos) marks.splice(i--, 1);
              else nextChange = Math.min(to, nextChange);
            }
          }
          var m = 0;
          while (pos < len) {
            if (nextChange == pos) advanceMarks();
            var upto = Math.min(len, nextChange);
            while (true) {
              if (text) {
                var end = pos + text.length;
                var appliedStyle = style;
                for (var j = 0; j < marks.length; ++j)
                  appliedStyle = (appliedStyle ? appliedStyle + " " : "") + marks[j].style;
                span(end > upto ? text.slice(0, upto - pos) : text, appliedStyle);
                if (end >= upto) {text = text.slice(upto - pos); pos = upto; break;}
                pos = end;
              }
              text = st[i++]; style = styleToClass(st[i++]);
            }
          }
        }
        return html.join("");
      },
      cleanUp: function() {
        this.parent = null;
        if (this.marked)
          for (var i = 0, e = this.marked.length; i < e; ++i) this.marked[i].detach(this);
      }
    };
    // 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;
      }
    }
  
    // Data structure that holds the sequence of lines.
    function LeafChunk(lines) {
      this.lines = lines;
      this.parent = null;
      for (var i = 0, e = lines.length, height = 0; i < e; ++i) {
        lines[i].parent = this;
        height += lines[i].height;
      }
      this.height = height;
    }
    LeafChunk.prototype = {
      chunkSize: function() { return this.lines.length; },
      remove: function(at, n, callbacks) {
        for (var i = at, e = at + n; i < e; ++i) {
          var line = this.lines[i];
          this.height -= line.height;
          line.cleanUp();
          if (line.handlers)
            for (var j = 0; j < line.handlers.length; ++j) callbacks.push(line.handlers[j]);
        }
        this.lines.splice(at, n);
      },
      collapse: function(lines) {
        lines.splice.apply(lines, [lines.length, 0].concat(this.lines));
      },
      insertHeight: function(at, lines, height) {
        this.height += height;
        this.lines = this.lines.slice(0, at).concat(lines).concat(this.lines.slice(at));
        for (var i = 0, e = lines.length; i < e; ++i) lines[i].parent = this;
      },
      iterN: function(at, n, op) {
        for (var e = at + n; at < e; ++at)
          if (op(this.lines[at])) return true;
      }
    };
    function BranchChunk(children) {
      this.children = children;
      var size = 0, height = 0;
      for (var i = 0, e = children.length; i < e; ++i) {
        var ch = children[i];
        size += ch.chunkSize(); height += ch.height;
        ch.parent = this;
      }
      this.size = size;
      this.height = height;
      this.parent = null;
    }
    BranchChunk.prototype = {
      chunkSize: function() { return this.size; },
      remove: function(at, n, callbacks) {
        this.size -= n;
        for (var i = 0; i < this.children.length; ++i) {
          var child = this.children[i], sz = child.chunkSize();
          if (at < sz) {
            var rm = Math.min(n, sz - at), oldHeight = child.height;
            child.remove(at, rm, callbacks);
            this.height -= oldHeight - child.height;
            if (sz == rm) { this.children.splice(i--, 1); child.parent = null; }
            if ((n -= rm) == 0) break;
            at = 0;
          } else at -= sz;
        }
        if (this.size - n < 25) {
          var lines = [];
          this.collapse(lines);
          this.children = [new LeafChunk(lines)];
          this.children[0].parent = this;
        }
      },
      collapse: function(lines) {
        for (var i = 0, e = this.children.length; i < e; ++i) this.children[i].collapse(lines);
      },
      insert: function(at, lines) {
        var height = 0;
        for (var i = 0, e = lines.length; i < e; ++i) height += lines[i].height;
        this.insertHeight(at, lines, height);
      },
      insertHeight: function(at, lines, height) {
        this.size += lines.length;
        this.height += height;
        for (var i = 0, e = this.children.length; i < e; ++i) {
          var child = this.children[i], sz = child.chunkSize();
          if (at <= sz) {
            child.insertHeight(at, lines, height);
            if (child.lines && child.lines.length > 50) {
              while (child.lines.length > 50) {
                var spilled = child.lines.splice(child.lines.length - 25, 25);
                var newleaf = new LeafChunk(spilled);
                child.height -= newleaf.height;
                this.children.splice(i + 1, 0, newleaf);
                newleaf.parent = this;
              }
              this.maybeSpill();
            }
            break;
          }
          at -= sz;
        }
      },
      maybeSpill: function() {
        if (this.children.length <= 10) return;
        var me = this;
        do {
          var spilled = me.children.splice(me.children.length - 5, 5);
          var sibling = new BranchChunk(spilled);
          if (!me.parent) { // Become the parent node
            var copy = new BranchChunk(me.children);
            copy.parent = me;
            me.children = [copy, sibling];
            me = copy;
          } else {
            me.size -= sibling.size;
            me.height -= sibling.height;
            var myIndex = indexOf(me.parent.children, me);
            me.parent.children.splice(myIndex + 1, 0, sibling);
          }
          sibling.parent = me.parent;
        } while (me.children.length > 10);
        me.parent.maybeSpill();
      },
      iter: function(from, to, op) { this.iterN(from, to - from, op); },
      iterN: function(at, n, op) {
        for (var i = 0, e = this.children.length; i < e; ++i) {
          var child = this.children[i], sz = child.chunkSize();
          if (at < sz) {
            var used = Math.min(n, sz - at);
            if (child.iterN(at, used, op)) return true;
            if ((n -= used) == 0) break;
            at = 0;
          } else at -= sz;
        }
      }
    };
  
    function getLineAt(chunk, n) {
      while (!chunk.lines) {
        for (var i = 0;; ++i) {
          var child = chunk.children[i], sz = child.chunkSize();
          if (n < sz) { chunk = child; break; }
          n -= sz;
        }
      }
      return chunk.lines[n];
    }
    function lineNo(line) {
      if (line.parent == null) return null;
      var cur = line.parent, no = indexOf(cur.lines, line);
      for (var chunk = cur.parent; chunk; cur = chunk, chunk = chunk.parent) {
        for (var i = 0, e = chunk.children.length; ; ++i) {
          if (chunk.children[i] == cur) break;
          no += chunk.children[i].chunkSize();
        }
      }
      return no;
    }
    function lineAtHeight(chunk, h) {
      var n = 0;
      outer: do {
        for (var i = 0, e = chunk.children.length; i < e; ++i) {
          var child = chunk.children[i], ch = child.height;
          if (h < ch) { chunk = child; continue outer; }
          h -= ch;
          n += child.chunkSize();
        }
        return n;
      } while (!chunk.lines);
      for (var i = 0, e = chunk.lines.length; i < e; ++i) {
        var line = chunk.lines[i], lh = line.height;
        if (h < lh) break;
        h -= lh;
      }
      return n + i;
    }
    function heightAtLine(chunk, n) {
      var h = 0;
      outer: do {
        for (var i = 0, e = chunk.children.length; i < e; ++i) {
          var child = chunk.children[i], sz = child.chunkSize();
          if (n < sz) { chunk = child; continue outer; }
          n -= sz;
          h += child.height;
        }
        return h;
      } while (!chunk.lines);
      for (var i = 0; i < n; ++i) h += chunk.lines[i].height;
      return h;
    }
  
    // 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 = [];
      this.compound = 0;
      this.closed = false;
    }
    History.prototype = {
      addChange: function(start, added, old) {
        this.undone.length = 0;
        var time = +new Date, cur = this.done[this.done.length - 1], last = cur && cur[cur.length - 1];
        var dtime = time - this.time;
  
        if (this.compound && cur && !this.closed) {
          cur.push({start: start, added: added, old: old});
        } else if (dtime > 400 || !last || this.closed ||
                   last.start > start + old.length || last.start + last.added < start) {
          this.done.push([{start: start, added: added, old: old}]);
          this.closed = false;
        } else {
          var startBefore = Math.max(0, last.start - start),
              endAfter = Math.max(0, (start + old.length) - (last.start + last.added));
          for (var i = startBefore; i > 0; --i) last.old.unshift(old[i - 1]);
          for (var i = endAfter; i > 0; --i) last.old.push(old[old.length - i]);
          if (startBefore) last.start = start;
          last.added += added - (old.length - startBefore - endAfter);
        }
        this.time = time;
      },
      startCompound: function() {
        if (!this.compound++) this.closed = true;
      },
      endCompound: function() {
        if (!--this.compound) this.closed = true;
      }
    };
  
    function stopMethod() {e_stop(this);}
    // Ensure an event has a stop method.
    function addStop(event) {
      if (!event.stop) event.stop = stopMethod;
      return event;
    }
  
    function e_preventDefault(e) {
      if (e.preventDefault) e.preventDefault();
      else e.returnValue = false;
    }
    function e_stopPropagation(e) {
      if (e.stopPropagation) e.stopPropagation();
      else e.cancelBubble = true;
    }
    function e_stop(e) {e_preventDefault(e); e_stopPropagation(e);}
    CodeMirror.e_stop = e_stop;
    CodeMirror.e_preventDefault = e_preventDefault;
    CodeMirror.e_stopPropagation = e_stopPropagation;
  
    function e_target(e) {return e.target || e.srcElement;}
    function e_button(e) {
      if (e.which) return e.which;
      else if (e.button & 1) return 1;
      else if (e.button & 2) return 3;
      else if (e.button & 4) return 2;
    }
  
    // Allow 3rd-party code to override event properties by adding an override
    // object to an event object.
    function e_prop(e, prop) {
      var overridden = e.override && e.override.hasOwnProperty(prop);
      return overridden ? e.override[prop] : e[prop];
    }
  
    // Event handler registration. If disconnect is true, it'll return a
    // function that unregisters the handler.
    function connect(node, type, handler, disconnect) {
      if (typeof node.addEventListener == "function") {
        node.addEventListener(type, handler, false);
        if (disconnect) return function() {node.removeEventListener(type, handler, false);};
      }
      else {
        var wrapHandler = function(event) {handler(event || window.event);};
        node.attachEvent("on" + type, wrapHandler);
        if (disconnect) return function() {node.detachEvent("on" + type, wrapHandler);};
      }
    }
    CodeMirror.connect = connect;
  
    function Delayed() {this.id = null;}
    Delayed.prototype = {set: function(ms, f) {clearTimeout(this.id); this.id = setTimeout(f, ms);}};
  
    var Pass = CodeMirror.Pass = {toString: function(){return "CodeMirror.Pass";}};
  
    var gecko = /gecko\/\d{7}/i.test(navigator.userAgent);
    var ie = /MSIE \d/.test(navigator.userAgent);
    var ie_lt9 = /MSIE [1-8]\b/.test(navigator.userAgent);
    var quirksMode = ie && document.documentMode == 5;
    var webkit = /WebKit\//.test(navigator.userAgent);
    var chrome = /Chrome\//.test(navigator.userAgent);
    var safari = /Apple Computer/.test(navigator.vendor);
    var khtml = /KHTML\//.test(navigator.userAgent);
  
    // Detect drag-and-drop
    var dragAndDrop = function() {
      // There is *some* kind of drag-and-drop support in IE6-8, but I
      // couldn't get it to work yet.
      if (ie_lt9) return false;
      var div = document.createElement('div');
      return "draggable" in div || "dragDrop" in div;
    }();
  
    // Feature-detect whether newlines in textareas are converted to \r\n
    var lineSep = function () {
      var te = document.createElement("textarea");
      te.value = "foo\nbar";
      if (te.value.indexOf("\r") > -1) return "\r\n";
      return "\n";
    }();
  
    // For a reason I have yet to figure out, some browsers disallow
    // word wrapping between certain characters *only* if a new inline
    // element is started between them. This makes it hard to reliably
    // measure the position of things, since that requires inserting an
    // extra span. This terribly fragile set of regexps matches the
    // character combinations that suffer from this phenomenon on the
    // various browsers.
    var spanAffectsWrapping = /^$/; // Won't match any two-character string
    if (gecko) spanAffectsWrapping = /$'/;
    else if (safari) spanAffectsWrapping = /\-[^ \-?]|\?[^ !'\"\),.\-\/:;\?\]\}]/;
    else if (chrome) spanAffectsWrapping = /\-[^ \-\.?]|\?[^ \-\.?\]\}:;!'\"\),\/]|[\.!\"#&%\)*+,:;=>\]|\}~][\(\{\[<]|\$'/;
  
    // Counts the column offset in a string, taking tabs into account.
    // Used mostly to find indentation.
    function countColumn(string, end, tabSize) {
      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;
    }
  
    function computedStyle(elt) {
      if (elt.currentStyle) return elt.currentStyle;
      return window.getComputedStyle(elt, null);
    }
  
    // Find the position of an element by following the offsetParent chain.
    // If screen==true, it returns screen (rather than page) coordinates.
    function eltOffset(node, screen) {
      var bod = node.ownerDocument.body;
      var x = 0, y = 0, skipBody = false;
      for (var n = node; n; n = n.offsetParent) {
        var ol = n.offsetLeft, ot = n.offsetTop;
        // Firefox reports weird inverted offsets when the body has a border.
        if (n == bod) { x += Math.abs(ol); y += Math.abs(ot); }
        else { x += ol, y += ot; }
        if (screen && computedStyle(n).position == "fixed")
          skipBody = true;
      }
      var e = screen && !skipBody ? null : bod;
      for (var n = node.parentNode; n != e; n = n.parentNode)
        if (n.scrollLeft != null) { x -= n.scrollLeft; y -= n.scrollTop;}
      return {left: x, top: y};
    }
    // Use the faster and saner getBoundingClientRect method when possible.
    if (document.documentElement.getBoundingClientRect != null) eltOffset = function(node, screen) {
      // Take the parts of bounding client rect that we are interested in so we are able to edit if need be,
      // since the returned value cannot be changed externally (they are kept in sync as the element moves within the page)
      try { var box = node.getBoundingClientRect(); box = { top: box.top, left: box.left }; }
      catch(e) { box = {top: 0, left: 0}; }
      if (!screen) {
        // Get the toplevel scroll, working around browser differences.
        if (window.pageYOffset == null) {
          var t = document.documentElement || document.body.parentNode;
          if (t.scrollTop == null) t = document.body;
          box.top += t.scrollTop; box.left += t.scrollLeft;
        } else {
          box.top += window.pageYOffset; box.left += window.pageXOffset;
        }
      }
      return box;
    };
  
    // Get a node's text content.
    function eltText(node) {
      return node.textContent || node.innerText || node.nodeValue || "";
    }
    function selectInput(node) {
      if (ios) { // Mobile Safari apparently has a bug where select() is broken.
        node.selectionStart = 0;
        node.selectionEnd = node.value.length;
      } else node.select();
    }
  
    // 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};}
  
    var escapeElement = document.createElement("pre");
    function htmlEscape(str) {
      escapeElement.textContent = str;
      return escapeElement.innerHTML;
    }
    // Recent (late 2011) Opera betas insert bogus newlines at the start
    // of the textContent, so we strip those.
    if (htmlEscape("a") == "\na")
      htmlEscape = function(str) {
        escapeElement.textContent = str;
        return escapeElement.innerHTML.slice(1);
      };
    // Some IEs don't preserve tabs through innerHTML
    else if (htmlEscape("\t") != "\t")
      htmlEscape = function(str) {
        escapeElement.innerHTML = "";
        escapeElement.appendChild(document.createTextNode(str));
        return escapeElement.innerHTML;
      };
    CodeMirror.htmlEscape = htmlEscape;
  
    // Used to position the cursor after an undo/redo by finding the
    // last edited character.
    function editEnd(from, to) {
      if (!to) return 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;
    }
    function isWordChar(ch) {
      return /\w/.test(ch) || ch.toUpperCase() != ch.toLowerCase();
    }
  
    // See if "".split is the broken IE version, if so, provide an
    // alternative way to split lines.
    var splitLines = "\n\nb".split(/\n/).length != 3 ? 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;
    } : function(string){return string.split(/\r?\n/);};
    CodeMirror.splitLines = splitLines;
  
    var hasSelection = window.getSelection ? function(te) {
      try { return te.selectionStart != te.selectionEnd; }
      catch(e) { return false; }
    } : function(te) {
      try {var range = te.ownerDocument.selection.createRange();}
      catch(e) {}
      if (!range || range.parentElement() != te) return false;
      return range.compareEndPoints("StartToEnd", range) != 0;
    };
  
    CodeMirror.defineMode("null", function() {
      return {token: function(stream) {stream.skipToEnd();}};
    });
    CodeMirror.defineMIME("text/plain", "null");
  
    var keyNames = {3: "Enter", 8: "Backspace", 9: "Tab", 13: "Enter", 16: "Shift", 17: "Ctrl", 18: "Alt",
                    19: "Pause", 20: "CapsLock", 27: "Esc", 32: "Space", 33: "PageUp", 34: "PageDown", 35: "End",
                    36: "Home", 37: "Left", 38: "Up", 39: "Right", 40: "Down", 44: "PrintScrn", 45: "Insert",
                    46: "Delete", 59: ";", 91: "Mod", 92: "Mod", 93: "Mod", 127: "Delete", 186: ";", 187: "=", 188: ",",
                    189: "-", 190: ".", 191: "/", 192: "`", 219: "[", 220: "\\", 221: "]", 222: "'", 63276: "PageUp",
                    63277: "PageDown", 63275: "End", 63273: "Home", 63234: "Left", 63232: "Up", 63235: "Right",
                    63233: "Down", 63302: "Insert", 63272: "Delete"};
    CodeMirror.keyNames = keyNames;
    (function() {
      // Number keys
      for (var i = 0; i < 10; i++) keyNames[i + 48] = String(i);
      // Alphabetic keys
      for (var i = 65; i <= 90; i++) keyNames[i] = String.fromCharCode(i);
      // Function keys
      for (var i = 1; i <= 12; i++) keyNames[i + 111] = keyNames[i + 63235] = "F" + i;
    })();
  
    return CodeMirror;
  })();
  