// CodeMirror version 2.35

//

// 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

window.CodeMirror = (function() {

  "use strict";

  // 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];



    var input = elt("textarea", null, null, "position: absolute; padding: 0; width: 1px; height: 1em");

    input.setAttribute("wrap", "off"); input.setAttribute("autocorrect", "off"); input.setAttribute("autocapitalize", "off");

    // Wraps and hides input textarea

    var inputDiv = elt("div", [input], null, "overflow: hidden; position: relative; width: 3px; height: 0px;");

    // The empty scrollbar content, used solely for managing the scrollbar thumb.

    var scrollbarInner = elt("div", null, "CodeMirror-scrollbar-inner");

    // The vertical scrollbar. Horizontal scrolling is handled by the scroller itself.

    var scrollbar = elt("div", [scrollbarInner], "CodeMirror-scrollbar");

    // DIVs containing the selection and the actual code

    var lineDiv = elt("div"), selectionDiv = elt("div", null, null, "position: relative; z-index: -1");

    // Blinky cursor, and element used to ensure cursor fits at the end of a line

    var cursor = elt("pre", "\u00a0", "CodeMirror-cursor"), widthForcer = elt("pre", "\u00a0", "CodeMirror-cursor", "visibility: hidden");

    // Used to measure text size

    var measure = elt("div", null, null, "position: absolute; width: 100%; height: 0px; overflow: hidden; visibility: hidden;");

    var lineSpace = elt("div", [measure, cursor, widthForcer, selectionDiv, lineDiv], null, "position: relative; z-index: 0");

    var gutterText = elt("div", null, "CodeMirror-gutter-text"), gutter = elt("div", [gutterText], "CodeMirror-gutter");

    // Moved around its parent to cover visible view

    var mover = elt("div", [gutter, elt("div", [lineSpace], "CodeMirror-lines")], null, "position: relative");

    // Set to the height of the text, causes scrolling

    var sizer = elt("div", [mover], null, "position: relative");

    // Provides scrolling

    var scroller = elt("div", [sizer], "CodeMirror-scroll");

    scroller.setAttribute("tabIndex", "-1");

    // The element in which the editor lives.

    var wrapper = elt("div", [inputDiv, scrollbar, scroller], "CodeMirror" + (options.lineWrapping ? " CodeMirror-wrap" : ""));

    if (place.appendChild) place.appendChild(wrapper); else place(wrapper);



    themeChanged(); keyMapChanged();

    // Needed to hide big blue blinking cursor on Mobile Safari

    if (ios) input.style.width = "0px";

    if (!webkit) scroller.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 OS X >= 10.7. This has transparent scrollbars, so the

    // overlaying of one scrollbar with another won't work. This is a

    // temporary hack to simply turn off the overlay scrollbar. See

    // issue #727.

    if (mac_geLion) { scrollbar.style.zIndex = -2; scrollbar.style.visibility = "hidden"; }

    // Need to set a minimum width to see the scrollbar on IE7 (but must not set it on IE8).

    else if (ie_lt8) scrollbar.style.minWidth = "18px";



    // 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,

    // frontier is the point up to which the content has been parsed,

    // and history the undo history (instance of History constructor).

    var mode, doc = new BranchChunk([new LeafChunk([new Line("")])]), frontier = 0, 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, lastScrollTop = 0, draggingText,

        overwrite = false, suppressEdits = false, pasteIncoming = false;

    // Variables used by startOperation/endOperation to track what

    // happened during the operation.

    var updateInput, userSelChange, changes, textChanged, selectionChanged,

        gutterDirty, callbacks;

    // 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 = getLine(0), updateMaxLine = false, maxLineChanged = true;

    var pollingFast = false; // Ensures slowPoll doesn't cancel fastPoll

    var goalColumn = null;



    // 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", onScrollMain);

    connect(scrollbar, "scroll", onScrollBar);

    connect(scrollbar, "mousedown", function() {if (focused) setTimeout(focusInput, 0);});

    var resizeHandler = connect(window, "resize", function() {

      if (wrapper.parentNode) updateDisplay(true);

      else resizeHandler();

    }, 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);



    function drag_(e) {

      if (options.onDragEvent && options.onDragEvent(instance, addStop(e))) return;

      e_stop(e);

    }

    if (options.dragDrop) {

      connect(scroller, "dragstart", onDragStart);

      connect(scroller, "dragenter", drag_);

      connect(scroller, "dragover", drag_);

      connect(scroller, "drop", operation(onDrop));

    }

    connect(scroller, "paste", function(){focusInput(); fastPoll();});

    connect(input, "paste", function(){pasteIncoming = true; fastPoll();});

    connect(input, "cut", operation(function(){

      if (!options.readOnly) replaceSelection("");

    }));



    // Needed to handle Tab key in KHTML

    if (khtml) connect(sizer, "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();

        else if (option == "tabindex") input.tabIndex = value;

        if (option == "lineNumbers" || option == "gutter" || option == "firstLineNumber" ||

            option == "theme" || option == "lineNumberFormatter") {

          gutterChanged();

          updateDisplay(true);

        }

      },

      getOption: function(option) {return options[option];},

      getMode: function() {return mode;},

      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();},

      setHistory: function(histData) {

        history = new History();

        history.done = histData.done;

        history.undone = histData.undone;

      },

      getHistory: function() {

        function cp(arr) {

          for (var i = 0, nw = [], nwelt; i < arr.length; ++i) {

            nw.push(nwelt = []);

            for (var j = 0, elt = arr[i]; j < elt.length; ++j) {

              var old = [], cur = elt[j];

              nwelt.push({start: cur.start, added: cur.added, old: old});

              for (var k = 0; k < cur.old.length; ++k) old.push(hlText(cur.old[k]));

            }

          }

          return nw;

        }

        return {done: cp(history.done), undone: cp(history.undone)};

      },

      matchBrackets: operation(function(){matchBrackets(true);}),

      getTokenAt: operation(function(pos) {

        pos = clipPos(pos);

        return getLine(pos.line).getTokenAt(mode, getStateBefore(pos.line), options.tabSize, 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,

      getViewport: function() { return {from: showingFrom, to: showingTo};},

      addWidget: function(pos, node, scroll, vert, horiz) {

        pos = localCoords(clipPos(pos));

        var top = pos.yBot, left = pos.x;

        node.style.position = "absolute";

        sizer.appendChild(node);

        if (vert == "over") top = pos.y;

        else if (vert == "near") {

          var vspace = Math.max(scroller.offsetHeight, doc.height * textHeight()),

              hspace = Math.max(sizer.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 = sizer.clientWidth - node.offsetWidth;

          node.style.right = "0px";

        } else {

          if (horiz == "left") left = 0;

          else if (horiz == "middle") left = (sizer.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, lineSep) {return getRange(clipPos(from), clipPos(to), lineSep);},



      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) scrollbar.scrollTop = scroller.scrollTop = y;

        updateDisplay([]);

      },

      getScrollInfo: function() {

        return {x: scroller.scrollLeft, y: scrollbar.scrollTop,

                height: scrollbar.scrollHeight, width: scroller.scrollWidth};

      },

      setSize: function(width, height) {

        function interpret(val) {

          val = String(val);

          return /^\d+$/.test(val) ? val + "px" : val;

        }

        if (width != null) wrapper.style.width = interpret(width);

        if (height != null) scroller.style.height = interpret(height);

        instance.refresh();

      },



      operation: function(f){return operation(f)();},

      compoundChange: function(f){return compoundChange(f);},

      refresh: function(){

        updateDisplay(true, null, lastScrollTop);

        if (scrollbar.scrollHeight > lastScrollTop)

          scrollbar.scrollTop = lastScrollTop;

      },

      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 lineContent(line, wrapAt) {

      if (!line.styles)

        line.highlight(mode, line.stateAfter = getStateBefore(lineNo(line)), options.tabSize);

      return line.getContent(options.tabSize, wrapAt, options.lineWrapping);

    }



    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(lineSep) {

      var text = [];

      doc.iter(0, doc.size, function(line) { text.push(line.text); });

      return text.join(lineSep || "\n");

    }



    function onScrollBar(e) {

      if (scrollbar.scrollTop != lastScrollTop) {

        lastScrollTop = scroller.scrollTop = scrollbar.scrollTop;

        updateDisplay([]);

      }

    }



    function onScrollMain(e) {

      if (options.fixedGutter && gutter.style.left != scroller.scrollLeft + "px")

        gutter.style.left = scroller.scrollLeft + "px";

      if (scroller.scrollTop != lastScrollTop) {

        lastScrollTop = scroller.scrollTop;

        if (scrollbar.scrollTop != lastScrollTop)

          scrollbar.scrollTop = lastScrollTop;

        updateDisplay([]);

      }

      if (options.onScroll) options.onScroll(instance);

    }



    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 == sizer && 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) onContextMenu(e);

        return;

      case 2:

        if (start) setCursor(start.line, start.ch, true);

        setTimeout(focusInput, 20);

        e_preventDefault(e);

        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, type = "single";

      if (lastDoubleClick && lastDoubleClick.time > now - 400 && posEq(lastDoubleClick.pos, start)) {

        type = "triple";

        e_preventDefault(e);

        setTimeout(focusInput, 20);

        selectLine(start.line);

      } else if (lastClick && lastClick.time > now - 400 && posEq(lastClick.pos, start)) {

        type = "double";

        lastDoubleClick = {time: now, pos: start};

        e_preventDefault(e);

        var word = findWordAt(start);

        setSelectionUser(word.from, word.to);

      } else { lastClick = {time: now, pos: start}; }



      function dragEnd(e2) {

        if (webkit) scroller.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 last = start, going;

      if (options.dragDrop && dragAndDrop && !options.readOnly && !posEq(sel.from, sel.to) &&

          !posLess(start, sel.from) && !posLess(sel.to, start) && type == "single") {

        // Let the drag handler handle this.

        if (webkit) scroller.draggable = true;

        var up = connect(document, "mouseup", operation(dragEnd), true);

        var drop = connect(scroller, "drop", operation(dragEnd), true);

        draggingText = true;

        // IE's approach to draggable

        if (scroller.dragDrop) scroller.dragDrop();

        return;

      }

      e_preventDefault(e);

      if (type == "single") setCursor(start.line, start.ch, true);



      var startstart = sel.from, startend = sel.to;



      function doSelect(cur) {

        if (type == "single") {

          setSelectionUser(start, cur);

        } else if (type == "double") {

          var word = findWordAt(cur);

          if (posLess(cur, startstart)) setSelectionUser(word.from, startend);

          else setSelectionUser(startstart, word.to);

        } else if (type == "triple") {

          if (posLess(cur, startstart)) setSelectionUser(startend, clipPos({line: cur.line, ch: 0}));

          else setSelectionUser(startstart, clipPos({line: cur.line + 1, ch: 0}));

        }

      }



      function extend(e) {

        var cur = posFromMouse(e, true);

        if (cur && !posEq(cur, last)) {

          if (!focused) onFocus();

          last = cur;

          doSelect(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) doSelect(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);

      e_preventDefault(e);

    }

    function onDrop(e) {

      if (options.onDragEvent && options.onDragEvent(instance, addStop(e))) return;

      e_preventDefault(e);

      var pos = posFromMouse(e, true), files = e.dataTransfer.files;

      if (!pos || options.readOnly) return;

      if (files && files.length && window.FileReader && window.File) {

        var n = files.length, text = Array(n), read = 0;

        var loadFile = function(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);

        };

        for (var i = 0; i < n; ++i) loadFile(files[i], i);

      } else {

        // Don't do a replace if the drop happened inside of the selected text.

        if (draggingText && !(posLess(pos, sel.from) || posLess(sel.to, pos))) return;

        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 (e.dataTransfer.setDragImage)

        e.dataTransfer.setDragImage(elt('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;

    }

    var maybeTransition;

    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;

      var flipCtrlCmd = opera && mac;

      if (name == null || e.altGraphKey) return false;

      if (e_prop(e, "altKey")) name = "Alt-" + name;

      if (e_prop(e, flipCtrlCmd ? "metaKey" : "ctrlKey")) name = "Ctrl-" + name;

      if (e_prop(e, flipCtrlCmd ? "ctrlKey" : "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;

    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 (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 (opera && keyCode == lastStoppedKey) {lastStoppedKey = null; e_preventDefault(e); return;}

      if (((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 (scroller.className.search(/\bCodeMirror-focused\b/) == -1)

          scroller.className += " CodeMirror-focused";

      }

      slowPoll();

      restartBlink();

    }

    function onBlur() {

      if (focused) {

        if (options.onBlur) options.onBlur(instance);

        focused = false;

        if (bracketHighlighted)

          operation(function(){

            if (bracketHighlighted) { bracketHighlighted(); bracketHighlighted = null; }

          })();

        scroller.className = scroller.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;

      var old = [];

      doc.iter(from.line, to.line + 1, function(line) {

        old.push(newHL(line.text, line.markedSpans));

      });

      if (history) {

        history.addChange(from.line, newText.length, old);

        while (history.done.length > options.undoDepth) history.done.shift();

      }

      var lines = updateMarkedSpans(hlSpans(old[0]), hlSpans(lst(old)), from.ch, to.ch, newText);

      updateLinesNoUndo(from, to, lines, 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(newHL(line.text, line.markedSpans)); });

        out.push({start: change.start, added: change.old.length, old: replaced});

        var pos = {line: change.start + change.old.length - 1,

                   ch: editEnd(hlText(lst(replaced)), hlText(lst(change.old)))};

        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, lines, selFrom, selTo) {

      if (suppressEdits) return;

      var recomputeMaxLength = false, maxLineLength = maxLine.text.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 || lines.length > 1) gutterDirty = true;



      var nlines = to.line - from.line, firstLine = getLine(from.line), lastLine = getLine(to.line);

      var lastHL = lst(lines);



      // First adjust the line structure

      if (from.ch == 0 && to.ch == 0 && hlText(lastHL) == "") {

        // This is a whole-line replace. Treated specially to make

        // sure line objects move the way they are supposed to.

        var added = [], prevLine = null;

        for (var i = 0, e = lines.length - 1; i < e; ++i)

          added.push(new Line(hlText(lines[i]), hlSpans(lines[i])));

        lastLine.update(lastLine.text, hlSpans(lastHL));

        if (nlines) doc.remove(from.line, nlines, callbacks);

        if (added.length) doc.insert(from.line, added);

      } else if (firstLine == lastLine) {

        if (lines.length == 1) {

          firstLine.update(firstLine.text.slice(0, from.ch) + hlText(lines[0]) + firstLine.text.slice(to.ch), hlSpans(lines[0]));

        } else {

          for (var added = [], i = 1, e = lines.length - 1; i < e; ++i)

            added.push(new Line(hlText(lines[i]), hlSpans(lines[i])));

          added.push(new Line(hlText(lastHL) + firstLine.text.slice(to.ch), hlSpans(lastHL)));

          firstLine.update(firstLine.text.slice(0, from.ch) + hlText(lines[0]), hlSpans(lines[0]));

          doc.insert(from.line + 1, added);

        }

      } else if (lines.length == 1) {

        firstLine.update(firstLine.text.slice(0, from.ch) + hlText(lines[0]) + lastLine.text.slice(to.ch), hlSpans(lines[0]));

        doc.remove(from.line + 1, nlines, callbacks);

      } else {

        var added = [];

        firstLine.update(firstLine.text.slice(0, from.ch) + hlText(lines[0]), hlSpans(lines[0]));

        lastLine.update(hlText(lastHL) + lastLine.text.slice(to.ch), hlSpans(lastHL));

        for (var i = 1, e = lines.length - 1; i < e; ++i)

          added.push(new Line(hlText(lines[i]), hlSpans(lines[i])));

        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 + lines.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 + lines.length, function(line) {

          var l = line.text;

          if (!line.hidden && l.length > maxLineLength) {

            maxLine = line; maxLineLength = l.length; maxLineChanged = true;

            recomputeMaxLength = false;

          }

        });

        if (recomputeMaxLength) updateMaxLine = true;

      }



      // Adjust frontier, schedule worker

      frontier = Math.min(frontier, from.line);

      startWorker(400);



      var lendiff = lines.length - nlines - 1;

      // Remember that these lines changed, for updating the display

      changes.push({from: from.line, to: to.line + 1, diff: lendiff});

      if (options.onChange) {

        // Normalize lines to contain only strings, since that's what

        // the change event handler expects

        for (var i = 0; i < lines.length; ++i)

          if (typeof lines[i] != "string") lines[i] = lines[i].text;

        var changeObj = {from: from, to: to, text: lines};

        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(clipPos(selFrom), clipPos(selTo),

                   updateLine(sel.from.line), updateLine(sel.to.line));

    }



    function needsScrollbar() {

      var realHeight = doc.height * textHeight() + 2 * paddingTop();

      return realHeight * .99 > scroller.offsetHeight ? realHeight : false;

    }



    function updateVerticalScroll(scrollTop) {

      var scrollHeight = needsScrollbar();

      scrollbar.style.display = scrollHeight ? "block" : "none";

      if (scrollHeight) {

        scrollbarInner.style.height = sizer.style.minHeight = scrollHeight + "px";

        scrollbar.style.height = scroller.clientHeight + "px";

        if (scrollTop != null) {

          scrollbar.scrollTop = scroller.scrollTop = scrollTop;

          // 'Nudge' the scrollbar to work around a Webkit bug where,

          // in some situations, we'd end up with a scrollbar that

          // reported its scrollTop (and looked) as expected, but

          // *behaved* as if it was still in a previous state (i.e.

          // couldn't scroll up, even though it appeared to be at the

          // bottom).

          if (webkit) setTimeout(function() {

            if (scrollbar.scrollTop != scrollTop) return;

            scrollbar.scrollTop = scrollTop + (scrollTop ? -1 : 1);

            scrollbar.scrollTop = scrollTop;

          }, 0);

        }

      } else {

        sizer.style.minHeight = "";

      }

      // Position the mover div to align with the current virtual scroll position

      mover.style.top = displayOffset * textHeight() + "px";

    }



    function computeMaxLength() {

      maxLine = getLine(0); maxLineChanged = true;

      var maxLineLength = maxLine.text.length;

      doc.iter(1, doc.size, function(line) {

        var l = line.text;

        if (!line.hidden && l.length > maxLineLength) {

          maxLineLength = l.length; maxLine = line;

        }

      });

      updateMaxLine = 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 += lst(code).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 : lst(code).length;

      var newSel = computeSel({line: from.line + code.length - 1, ch: endch});

      updateLines(from, to, code, newSel.from, newSel.to);

    }



    function getRange(from, to, lineSep) {

      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(lineSep || "\n");

    }

    function getSelection(lineSep) {

      return getRange(sel.from, sel.to, lineSep);

    }



    function slowPoll() {

      if (pollingFast) return;

      poll.set(options.pollInterval, function() {

        readInput();

        if (focused) slowPoll();

      });

    }

    function fastPoll() {

      var missed = false;

      pollingFast = true;

      function p() {

        var changed = readInput();

        if (!changed && !missed) {missed = true; poll.set(60, p);}

        else {pollingFast = false; slowPoll();}

      }

      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 (!focused || hasSelection(input) || options.readOnly) return false;

      var text = input.value;

      if (text == prevInput) return false;

      if (!nestedOperation) startOperation();

      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) && !pasteIncoming)

        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;

      if (!nestedOperation) endOperation();

      pasteIncoming = false;

      return true;

    }

    function resetInput(user) {

      if (!posEq(sel.from, sel.to)) {

        prevInput = "";

        input.value = getSelection();

        if (focused) selectInput(input);

      } else if (user) prevInput = input.value = "";

    }



    function focusInput() {

      if (options.readOnly != "nocursor") input.focus();

    }



    function scrollCursorIntoView() {

      var coords = calculateCursorCoords();

      scrollIntoView(coords.x, coords.y, coords.x, coords.yBot);

      if (!focused) return;

      var box = sizer.getBoundingClientRect(), doScroll = null;

      if (coords.y + box.top < 0) doScroll = true;

      else if (coords.y + box.top + textHeight() > (window.innerHeight || document.documentElement.clientHeight)) doScroll = false;

      if (doScroll != null) {

        var hidden = cursor.style.display == "none";

        if (hidden) {

          cursor.style.display = "";

          cursor.style.left = coords.x + "px";

          cursor.style.top = (coords.y - displayOffset) + "px";

        }

        cursor.scrollIntoView(doScroll);

        if (hidden) cursor.style.display = "none";

      }

    }

    function calculateCursorCoords() {

      var cursor = localCoords(sel.inverted ? sel.from : sel.to);

      var x = options.lineWrapping ? Math.min(cursor.x, lineSpace.offsetWidth) : cursor.x;

      return {x: x, y: cursor.y, yBot: cursor.yBot};

    }

    function scrollIntoView(x1, y1, x2, y2) {

      var scrollPos = calculateScrollPos(x1, y1, x2, y2);

      if (scrollPos.scrollLeft != null) {scroller.scrollLeft = scrollPos.scrollLeft;}

      if (scrollPos.scrollTop != null) {scrollbar.scrollTop = scroller.scrollTop = scrollPos.scrollTop;}

    }

    function calculateScrollPos(x1, y1, x2, y2) {

      var pl = paddingLeft(), pt = paddingTop();

      y1 += pt; y2 += pt; x1 += pl; x2 += pl;

      var screen = scroller.clientHeight, screentop = scrollbar.scrollTop, result = {};

      var docBottom = needsScrollbar() || Infinity;

      var atTop = y1 < pt + 10, atBottom = y2 + pt > docBottom - 10;

      if (y1 < screentop) result.scrollTop = atTop ? 0 : Math.max(0, y1);

      else if (y2 > screentop + screen) result.scrollTop = (atBottom ? docBottom : y2) - screen;



      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;

        result.scrollLeft = Math.max(0, x1 - 10 - gutterw);

      } else if (x2 > screenw + screenleft - 3) {

        result.scrollLeft = x2 + 10 - screenw;

      }

      return result;

    }



    function visibleLines(scrollTop) {

      var lh = textHeight(), top = (scrollTop != null ? scrollTop : scrollbar.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, scrollTop) {

      if (!scroller.clientWidth) {

        showingFrom = showingTo = displayOffset = 0;

        return;

      }

      // Compute the new visible window

      // If scrollTop is specified, use that to determine which lines

      // to render instead of the current scrollbar position.

      var visible = visibleLines(scrollTop);

      // Bail out if the visible area is already rendered and nothing changed.

      if (changes !== true && changes.length == 0 && visible.from > showingFrom && visible.to < showingTo) {

        updateVerticalScroll(scrollTop);

        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) {

        updateVerticalScroll(scrollTop);

        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 = "";



      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;

      if (from != showingFrom || to != showingTo && options.onViewportChange)

        setTimeout(function(){

          if (options.onViewportChange) options.onViewportChange(instance, from, to);

        });

      showingFrom = from; showingTo = to;

      displayOffset = heightAtLine(doc, from);

      startWorker(100);



      // 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() {

        var curNode = lineDiv.firstChild, heightChanged = false;

        doc.iter(showingFrom, showingTo, function(line) {

          // Work around bizarro IE7 bug where, sometimes, our curNode

          // is magically replaced with a new node in the DOM, leaving

          // us with a reference to an orphan (nextSibling-less) node.

          if (!curNode) return;

          if (!line.hidden) {

            var height = Math.round(curNode.offsetHeight / th) || 1;

            if (line.height != height) {

              updateLineHeight(line, height);

              gutterDirty = heightChanged = true;

            }

          }

          curNode = curNode.nextSibling;

        });

        return heightChanged;

      }



      if (options.lineWrapping) checkHeights();



      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();

      }

      updateVerticalScroll(scrollTop);

      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) {

      function killNode(node) {

        var tmp = node.nextSibling;

        node.parentNode.removeChild(node);

        return tmp;

      }

      // The first pass removes the DOM nodes that aren't intact.

      if (!intact.length) removeChildren(lineDiv);

      else {

        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;

      doc.iter(from, to, function(line) {

        if (nextIntact && nextIntact.to == j) nextIntact = intact.shift();

        if (!nextIntact || nextIntact.from > j) {

          if (line.hidden) var lineElement = elt("pre");

          else {

            var lineElement = lineContent(line);

            if (line.className) lineElement.className = line.className;

            // Kludge to make sure the styled element lies behind the selection (by z-index)

            if (line.bgClassName) {

              var pre = elt("pre", "\u00a0", line.bgClassName, "position: absolute; left: 0; right: 0; top: 0; bottom: 0; z-index: -2");

              lineElement = elt("div", [pre, lineElement], null, "position: relative");

            }

          }

          lineDiv.insertBefore(lineElement, 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 fragment = document.createDocumentFragment(), i = showingFrom, normalNode;

      doc.iter(showingFrom, Math.max(showingTo, showingFrom + 1), function(line) {

        if (line.hidden) {

          fragment.appendChild(elt("pre"));

        } else {

          var marker = line.gutterMarker;

          var text = options.lineNumbers ? options.lineNumberFormatter(i + options.firstLineNumber) : null;

          if (marker && marker.text)

            text = marker.text.replace("%N%", text != null ? text : "");

          else if (text == null)

            text = "\u00a0";

          var markerElement = fragment.appendChild(elt("pre", null, marker && marker.style));

          markerElement.innerHTML = text;

          for (var j = 1; j < line.height; ++j) {

            markerElement.appendChild(elt("br"));

            markerElement.appendChild(document.createTextNode("\u00a0"));

          }

          if (!marker) normalNode = i;

        }

        ++i;

      });

      gutter.style.display = "none";

      removeChildrenAndAdd(gutterText, fragment);

      // Make sure scrolling doesn't cause number gutter size to pop

      if (normalNode != null && options.lineNumbers) {

        var node = gutterText.childNodes[normalNode - showingFrom];

        var minwidth = String(doc.size).length, val = eltText(node.firstChild), 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, fragment = document.createDocumentFragment();

        var clientWidth = lineSpace.clientWidth || lineSpace.offsetWidth;

        var clientHeight = lineSpace.clientHeight || lineSpace.offsetHeight;

        var add = function(left, top, right, height) {

          var rstyle = quirksMode ? "width: " + (!right ? clientWidth : clientWidth - right - left) + "px"

                                  : "right: " + right + "px";

          fragment.appendChild(elt("div", null, "CodeMirror-selected", "position: absolute; left: " + left +

                                   "px; top: " + top + "px; " + rstyle + "; height: " + height + "px"));

        };

        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);

        removeChildrenAndAdd(selectionDiv, fragment);

        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;

    }

    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") {

        var screen = Math.min(scroller.clientHeight, window.innerHeight || document.documentElement.clientHeight);

        var target = coordsChar(pos.x, pos.y + screen * dir);

      } else if (unit == "line") {

        var th = textHeight();

        var target = coordsChar(pos.x, pos.y + .5 * th + dir * th);

      }

      if (unit == "page") scrollbar.scrollTop += localCoords(target, true).y - pos.y;

      setCursor(target.line, target.ch, true);

      goalColumn = pos.x;

    }



    function findWordAt(pos) {

      var line = getLine(pos.line).text;

      var start = pos.ch, end = pos.ch;

      if (line) {

        if (pos.after === false || end == line.length) --start; else ++end;

        var startChar = line.charAt(start);

        var check = isWordChar(startChar) ? isWordChar :

                    /\s/.test(startChar) ? function(ch) {return /\s/.test(ch);} :

                    function(ch) {return !/\s/.test(ch) && isWordChar(ch);};

        while (start > 0 && check(line.charAt(start - 1))) --start;

        while (end < line.length && check(line.charAt(end))) ++end;

      }

      return {from: {line: pos.line, ch: start}, to: {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 == "smart") {

        indentation = mode.indent(state, line.text.slice(curSpaceString.length), line.text);

        if (indentation == Pass) how = "prev";

      }

      if (how == "prev") {

        if (n) indentation = getLine(n-1).indentation(options.tabSize);

        else indentation = 0;

      }

      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;



      var indentString = "", pos = 0;

      if (options.indentWithTabs)

        for (var i = Math.floor(indentation / options.tabSize); i; --i) {pos += options.tabSize; indentString += "\t";}

      if (pos < indentation) indentString += spaceStr(indentation - pos);



      if (indentString != curSpaceString)

        replaceRange(indentString, {line: n, ch: 0}, {line: n, ch: curSpaceString.length});

      line.stateAfter = null;

    }



    function loadMode() {

      mode = CodeMirror.getMode(options, options.mode);

      doc.iter(0, doc.size, function(line) { line.stateAfter = null; });

      frontier = 0;

      startWorker(100);

    }

    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.minWidth = widthForcer.style.left = "";

      } else {

        wrapper.className = wrapper.className.replace(" CodeMirror-wrap", "");

        computeMaxLength();

        doc.iter(0, doc.size, function(line) {

          if (line.height != 1 && !line.hidden) updateLineHeight(line, 1);

        });

      }

      changes.push({from: 0, to: doc.size});

    }

    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(type, style) { this.lines = []; this.type = type; if (style) this.style = style; }

    TextMarker.prototype.clear = operation(function() {

      var min, max;

      for (var i = 0; i < this.lines.length; ++i) {

        var line = this.lines[i];

        var span = getMarkedSpanFor(line.markedSpans, this);

        if (span.from != null) min = lineNo(line);

        if (span.to != null) max = lineNo(line);

        line.markedSpans = removeMarkedSpan(line.markedSpans, span);

      }

      if (min != null) changes.push({from: min, to: max + 1});

      this.lines.length = 0;

      this.explicitlyCleared = true;

    });

    TextMarker.prototype.find = function() {

      var from, to;

      for (var i = 0; i < this.lines.length; ++i) {

        var line = this.lines[i];

        var span = getMarkedSpanFor(line.markedSpans, this);

        if (span.from != null || span.to != null) {

          var found = lineNo(line);

          if (span.from != null) from = {line: found, ch: span.from};

          if (span.to != null) to = {line: found, ch: span.to};

        }

      }

      if (this.type == "bookmark") return from;

      return from && {from: from, to: to};

    };



    function markText(from, to, className, options) {

      from = clipPos(from); to = clipPos(to);

      var marker = new TextMarker("range", className);

      if (options) for (var opt in options) if (options.hasOwnProperty(opt))

        marker[opt] = options[opt];

      var curLine = from.line;

      doc.iter(curLine, to.line + 1, function(line) {

        var span = {from: curLine == from.line ? from.ch : null,

                    to: curLine == to.line ? to.ch : null,

                    marker: marker};

        line.markedSpans = (line.markedSpans || []).concat([span]);

        marker.lines.push(line);

        ++curLine;

      });

      changes.push({from: from.line, to: to.line + 1});

      return marker;

    }



    function setBookmark(pos) {

      pos = clipPos(pos);

      var marker = new TextMarker("bookmark"), line = getLine(pos.line);

      history.addChange(pos.line, 1, [newHL(line.text, line.markedSpans)], true);

      var span = {from: pos.ch, to: pos.ch, marker: marker};

      line.markedSpans = (line.markedSpans || []).concat([span]);

      marker.lines.push(line);

      return marker;

    }



    function findMarksAt(pos) {

      pos = clipPos(pos);

      var markers = [], spans = getLine(pos.line).markedSpans;

      if (spans) for (var i = 0; i < spans.length; ++i) {

        var span = spans[i];

        if ((span.from == null || span.from <= pos.ch) &&

            (span.to == null || span.to >= pos.ch))

          markers.push(span.marker);

      }

      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) {

            if (hidden && line.text.length == maxLine.text.length) {

              updateMaxLine = true;

            } else if (!hidden && line.text.length > maxLine.text.length) {

              maxLine = line; updateMaxLine = 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 measureLine(line, ch) {

      if (ch == 0) return {top: 0, left: 0};

      var pre = lineContent(line, ch);

      removeChildrenAndAdd(measure, pre);

      var anchor = pre.anchor;

      var top = anchor.offsetTop, left = anchor.offsetLeft;

      // Older IEs report zero offsets for spans directly after a wrap

      if (ie && top == 0 && left == 0) {

        var backup = elt("span", "x");

        anchor.parentNode.insertBefore(backup, anchor.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) {

      var th = textHeight(), cw = charWidth(), heightPos = displayOffset + Math.floor(y / th);

      if (heightPos < 0) return {line: 0, ch: 0};

      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};

      var wrongLine = false;

      function getX(len) {

        var sp = measureLine(lineObj, len);

        if (tw) {

          var off = Math.round(sp.top / th);

          wrongLine = off != innerOff;

          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) {

          var after = x - fromX < toX - x;

          return {line: lineNo, ch: after ? from : to, after: after};

        }

        var middle = Math.ceil((from + to) / 2), middleX = getX(middle);

        if (middleX > x) {to = middle; toX = middleX; if (wrongLine) toX += 1000; }

        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, measurePre;

    function textHeight() {

      if (measurePre == null) {

        measurePre = elt("pre");

        for (var i = 0; i < 49; ++i) {

          measurePre.appendChild(document.createTextNode("x"));

          measurePre.appendChild(elt("br"));

        }

        measurePre.appendChild(document.createTextNode("x"));

      }

      var offsetHeight = lineDiv.clientHeight;

      if (offsetHeight == cachedHeightFor) return cachedHeight;

      cachedHeightFor = offsetHeight;

      removeChildrenAndAdd(measure, measurePre.cloneNode(true));

      cachedHeight = measure.firstChild.offsetHeight / 50 || 1;

      removeChildren(measure);

      return cachedHeight;

    }

    var cachedWidth, cachedWidthFor = 0;

    function charWidth() {

      if (scroller.clientWidth == cachedWidthFor) return cachedWidth;

      cachedWidthFor = scroller.clientWidth;

      var anchor = elt("span", "x");

      var pre = elt("pre", [anchor]);

      removeChildrenAndAdd(measure, pre);

      return (cachedWidth = anchor.offsetWidth || 10);

    }

    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);

    }

    var detectingSelectAll;

    function onContextMenu(e) {

      var pos = posFromMouse(e), scrollPos = scrollbar.scrollTop;

      if (!pos || 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);";

      focusInput();

      resetInput(true);

      // Adds "Select all" to context menu in FF

      if (posEq(sel.from, sel.to)) input.value = prevInput = " ";



      function rehide() {

        inputDiv.style.position = "relative";

        input.style.cssText = oldCSS;

        if (ie_lt9) scrollbar.scrollTop = scrollPos;

        slowPoll();



        // Try to detect the user choosing select-all 

        if (input.selectionStart != null) {

          clearTimeout(detectingSelectAll);

          var extval = input.value = " " + (posEq(sel.from, sel.to) ? "" : input.value), i = 0;

          prevInput = " ";

          input.selectionStart = 1; input.selectionEnd = extval.length;

          detectingSelectAll = setTimeout(function poll(){

            if (prevInput == " " && input.selectionStart == 0)

              operation(commands.selectAll)(instance);

            else if (i++ < 10) detectingSelectAll = setTimeout(poll, 500);

            else resetInput();

          }, 200);

        }

      }



      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";

      }, options.cursorBlinkRate);

    }



    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] != 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 pos = findStartLine(n), state = pos && getLine(pos-1).stateAfter;

      if (!state) state = startState(mode);

      else state = copyState(mode, state);

      doc.iter(pos, n, function(line) {

        line.process(mode, state, options.tabSize);

        line.stateAfter = (pos == n - 1 || pos % 5 == 0) ? copyState(mode, state) : null;

      });

      return state;

    }

    function highlightWorker() {

      if (frontier >= showingTo) return;

      var end = +new Date + options.workTime, state = copyState(mode, getStateBefore(frontier));

      var startFrontier = frontier;

      doc.iter(frontier, showingTo, function(line) {

        if (frontier >= showingFrom) { // Visible

          line.highlight(mode, state, options.tabSize);

          line.stateAfter = copyState(mode, state);

        } else {

          line.process(mode, state, options.tabSize);

          line.stateAfter = frontier % 5 == 0 ? copyState(mode, state) : null;

        }

        ++frontier;

        if (+new Date > end) {

          startWorker(options.workDelay);

          return true;

        }

      });

      if (showingTo > startFrontier && frontier >= showingFrom)

        operation(function() {changes.push({from: startFrontier, to: frontier});})();

    }

    function startWorker(time) {

      if (frontier < showingTo)

        highlight.set(time, 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() {

      if (updateMaxLine) computeMaxLength();

      if (maxLineChanged && !options.lineWrapping) {

        var cursorWidth = widthForcer.offsetWidth, left = measureLine(maxLine, maxLine.text.length).left;

        if (!ie_lt8) {

          widthForcer.style.left = left + "px";

          lineSpace.style.minWidth = (left + cursorWidth) + "px";

        }

        maxLineChanged = false;

      }

      var newScrollPos, updated;

      if (selectionChanged) {

        var coords = calculateCursorCoords();

        newScrollPos = calculateScrollPos(coords.x, coords.y, coords.x, coords.yBot);

      }

      if (changes.length || newScrollPos && newScrollPos.scrollTop != null)

        updated = updateDisplay(changes, true, newScrollPos && newScrollPos.scrollTop);

      if (!updated) {

        if (selectionChanged) updateSelection();

        if (gutterDirty) updateGutter();

      }

      if (newScrollPos) scrollCursorIntoView();

      if (selectionChanged) restartBlink();



      if (focused && (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 sc = selectionChanged, cbs = callbacks; // these can be reset by callbacks

      if (textChanged && options.onChange && instance)

        options.onChange(instance, textChanged);

      if (sc && options.onCursorActivity)

        options.onCursorActivity(instance);

      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];

    for (var i = 0; i < initHooks.length; ++i) initHooks[i](instance);

    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,

    onViewportChange: null,

    onGutterClick: null,

    onUpdate: null,

    onFocus: null, onBlur: null, onScroll: null,

    matchBrackets: false,

    cursorBlinkRate: 530,

    workTime: 100,

    workDelay: 200,

    pollInterval: 100,

    undoDepth: 40,

    tabindex: null,

    autofocus: null,

    lineNumberFormatter: function(integer) { return integer; }

  };



  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");

    var modeObj = mfactory(options, spec);

    if (modeExtensions.hasOwnProperty(spec.name)) {

      var exts = modeExtensions[spec.name];

      for (var prop in exts) if (exts.hasOwnProperty(prop)) modeObj[prop] = exts[prop];

    }

    modeObj.name = spec.name;

    return modeObj;

  };

  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 initHooks = [];

  CodeMirror.defineInitHook = function(f) {initHooks.push(f);};



  var modeExtensions = CodeMirror.modeExtensions = {};

  CodeMirror.extendMode = function(mode, properties) {

    var exts = modeExtensions.hasOwnProperty(mode) ? modeExtensions[mode] : (modeExtensions[mode] = {});

    for (var prop in properties) if (properties.hasOwnProperty(prop))

      exts[prop] = properties[prop];

  };



  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 === false) {

        if (stop) stop();

        return true;

      }

      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.isModifierKey = isModifierKey;



  CodeMirror.fromTextArea = function(textarea, options) {

    if (!options) options = {};

    options.value = textarea.value;

    if (!options.tabindex && textarea.tabindex)

      options.tabindex = textarea.tabindex;

    // Set autofocus to true if this textarea is focused, or if it has

    // autofocus and no other element is focused.

    if (options.autofocus == null) {

      var hasFocus = document.body;

      // doc.activeElement occasionally throws on IE

      try { hasFocus = document.activeElement; } catch(e) {}

      options.autofocus = hasFocus == textarea ||

        textarea.getAttribute("autofocus") != null && hasFocus == document.body;

    }



    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;

        textarea.form.submit = function wrappedSubmit() {

          save();

          textarea.form.submit = realSubmit;

          textarea.form.submit();

          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;

  };



  var gecko = /gecko\/\d{7}/i.test(navigator.userAgent);

  var ie = /MSIE \d/.test(navigator.userAgent);

  var ie_lt8 = /MSIE [1-7]\b/.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 opera = /Opera\//.test(navigator.userAgent);

  var safari = /Apple Computer/.test(navigator.vendor);

  var khtml = /KHTML\//.test(navigator.userAgent);

  var mac_geLion = /Mac OS X 10\D([7-9]|\d\d)\D/.test(navigator.userAgent);



  // 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;

  CodeMirror.innerMode = function(mode, state) {

    while (mode.innerMode) {

      var info = mode.innerMode(state);

      state = info.state;

      mode = info.mode;

    }

    return info || {mode: mode, state: state};

  };



  // 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) || undefined;},

    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") {

        var cased = function(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 && match.index > 0) return null;

        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 MarkedSpan(from, to, marker) {

    this.from = from; this.to = to; this.marker = marker;

  }



  function getMarkedSpanFor(spans, marker) {

    if (spans) for (var i = 0; i < spans.length; ++i) {

      var span = spans[i];

      if (span.marker == marker) return span;

    }

  }



  function removeMarkedSpan(spans, span) {

    var r;

    for (var i = 0; i < spans.length; ++i)

      if (spans[i] != span) (r || (r = [])).push(spans[i]);

    return r;

  }



  function markedSpansBefore(old, startCh, endCh) {

    if (old) for (var i = 0, nw; i < old.length; ++i) {

      var span = old[i], marker = span.marker;

      var startsBefore = span.from == null || (marker.inclusiveLeft ? span.from <= startCh : span.from < startCh);

      if (startsBefore || marker.type == "bookmark" && span.from == startCh && span.from != endCh) {

        var endsAfter = span.to == null || (marker.inclusiveRight ? span.to >= startCh : span.to > startCh);

        (nw || (nw = [])).push({from: span.from,

                                to: endsAfter ? null : span.to,

                                marker: marker});

      }

    }

    return nw;

  }



  function markedSpansAfter(old, endCh) {

    if (old) for (var i = 0, nw; i < old.length; ++i) {

      var span = old[i], marker = span.marker;

      var endsAfter = span.to == null || (marker.inclusiveRight ? span.to >= endCh : span.to > endCh);

      if (endsAfter || marker.type == "bookmark" && span.from == endCh) {

        var startsBefore = span.from == null || (marker.inclusiveLeft ? span.from <= endCh : span.from < endCh);

        (nw || (nw = [])).push({from: startsBefore ? null : span.from - endCh,

                                to: span.to == null ? null : span.to - endCh,

                                marker: marker});

      }

    }

    return nw;

  }



  function updateMarkedSpans(oldFirst, oldLast, startCh, endCh, newText) {

    if (!oldFirst && !oldLast) return newText;

    // Get the spans that 'stick out' on both sides

    var first = markedSpansBefore(oldFirst, startCh);

    var last = markedSpansAfter(oldLast, endCh);



    // Next, merge those two ends

    var sameLine = newText.length == 1, offset = lst(newText).length + (sameLine ? startCh : 0);

    if (first) {

      // Fix up .to properties of first

      for (var i = 0; i < first.length; ++i) {

        var span = first[i];

        if (span.to == null) {

          var found = getMarkedSpanFor(last, span.marker);

          if (!found) span.to = startCh;

          else if (sameLine) span.to = found.to == null ? null : found.to + offset;

        }

      }

    }

    if (last) {

      // Fix up .from in last (or move them into first in case of sameLine)

      for (var i = 0; i < last.length; ++i) {

        var span = last[i];

        if (span.to != null) span.to += offset;

        if (span.from == null) {

          var found = getMarkedSpanFor(first, span.marker);

          if (!found) {

            span.from = offset;

            if (sameLine) (first || (first = [])).push(span);

          }

        } else {

          span.from += offset;

          if (sameLine) (first || (first = [])).push(span);

        }

      }

    }



    var newMarkers = [newHL(newText[0], first)];

    if (!sameLine) {

      // Fill gap with whole-line-spans

      var gap = newText.length - 2, gapMarkers;

      if (gap > 0 && first)

        for (var i = 0; i < first.length; ++i)

          if (first[i].to == null)

            (gapMarkers || (gapMarkers = [])).push({from: null, to: null, marker: first[i].marker});

      for (var i = 0; i < gap; ++i)

        newMarkers.push(newHL(newText[i+1], gapMarkers));

      newMarkers.push(newHL(lst(newText), last));

    }

    return newMarkers;

  }



  // hl stands for history-line, a data structure that can be either a

  // string (line without markers) or a {text, markedSpans} object.

  function hlText(val) { return typeof val == "string" ? val : val.text; }

  function hlSpans(val) {

    if (typeof val == "string") return null;

    var spans = val.markedSpans, out = null;

    for (var i = 0; i < spans.length; ++i) {

      if (spans[i].marker.explicitlyCleared) { if (!out) out = spans.slice(0, i); }

      else if (out) out.push(spans[i]);

    }

    return !out ? spans : out.length ? out : null;

  }

  function newHL(text, spans) { return spans ? {text: text, markedSpans: spans} : text; }



  function detachMarkedSpans(line) {

    var spans = line.markedSpans;

    if (!spans) return;

    for (var i = 0; i < spans.length; ++i) {

      var lines = spans[i].marker.lines;

      var ix = indexOf(lines, line);

      lines.splice(ix, 1);

    }

    line.markedSpans = null;

  }



  function attachMarkedSpans(line, spans) {

    if (!spans) return;

    for (var i = 0; i < spans.length; ++i)

      var marker = spans[i].marker.lines.push(line);

    line.markedSpans = spans;

  }



  // When measuring the position of the end of a line, different

  // browsers require different approaches. If an empty span is added,

  // many browsers report bogus offsets. Of those, some (Webkit,

  // recent IE) will accept a space without moving the whole span to

  // the next line when wrapping it, others work with a zero-width

  // space.

  var eolSpanContent = " ";

  if (gecko || (ie && !ie_lt8)) eolSpanContent = "\u200b";

  else if (opera) eolSpanContent = "";



  // Line objects. These hold state related to a line, including

  // highlighting info (the styles array).

  function Line(text, markedSpans) {

    this.text = text;

    this.height = 1;

    attachMarkedSpans(this, markedSpans);

  }

  Line.prototype = {

    update: function(text, markedSpans) {

      this.text = text;

      this.stateAfter = this.styles = null;

      detachMarkedSpans(this);

      attachMarkedSpans(this, markedSpans);

    },

    // 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 || (this.styles = []);

      var pos = st.length = 0;

      if (this.text == "" && mode.blankLine) mode.blankLine(state);

      while (!stream.eol()) {

        var style = mode.token(stream, state), substr = stream.current();

        stream.start = stream.pos;

        if (pos && st[pos-1] == style) {

          st[pos-2] += substr;

        } else if (substr) {

          st[pos++] = substr; st[pos++] = style;

        }

        // Give up when line is ridiculously long

        if (stream.pos > 5000) {

          st[pos++] = this.text.slice(stream.pos); st[pos++] = null;

          break;

        }

      }

    },

    process: function(mode, state, tabSize) {

      var stream = new StringStream(this.text, tabSize);

      if (this.text == "" && mode.blankLine) mode.blankLine(state);

      while (!stream.eol() && stream.pos <= 5000) {

        mode.token(stream, state);

        stream.start = stream.pos;

      }

    },

    // 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, tabSize, ch) {

      var txt = this.text, stream = new StringStream(txt, tabSize);

      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.

    getContent: function(tabSize, wrapAt, compensateForWrapping) {

      var first = true, col = 0, specials = /[\t\u0000-\u0019\u200b\u2028\u2029\uFEFF]/g;

      var pre = elt("pre");

      function span_(html, 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 (!specials.test(text)) {

          col += text.length;

          var content = document.createTextNode(text);

        } else {

          var content = document.createDocumentFragment(), pos = 0;

          while (true) {

            specials.lastIndex = pos;

            var m = specials.exec(text);

            var skipped = m ? m.index - pos : text.length - pos;

            if (skipped) {

              content.appendChild(document.createTextNode(text.slice(pos, pos + skipped)));

              col += skipped;

            }

            if (!m) break;

            pos += skipped + 1;

            if (m[0] == "\t") {

              var tabWidth = tabSize - col % tabSize;

              content.appendChild(elt("span", spaceStr(tabWidth), "cm-tab"));

              col += tabWidth;

            } else {

              var token = elt("span", "\u2022", "cm-invalidchar");

              token.title = "\\u" + m[0].charCodeAt(0).toString(16);

              content.appendChild(token);

              col += 1;

            }

          }

        }

        if (style) html.appendChild(elt("span", [content], style));

        else html.appendChild(content);

      }

      var span = span_;

      if (wrapAt != null) {

        var outPos = 0, anchor = pre.anchor = elt("span");

        span = function(html, text, style) {

          var l = text.length;

          if (wrapAt >= outPos && wrapAt < outPos + l) {

            var cut = wrapAt - outPos;

            if (cut) {

              span_(html, text.slice(0, cut), style);

              // See comment at the definition of spanAffectsWrapping

              if (compensateForWrapping) {

                var view = text.slice(cut - 1, cut + 1);

                if (spanAffectsWrapping.test(view)) html.appendChild(elt("wbr"));

                else if (!ie_lt8 && /\w\w/.test(view)) html.appendChild(document.createTextNode("\u200d"));

              }

            }

            html.appendChild(anchor);

            span_(anchor, opera ? text.slice(cut, cut + 1) : text.slice(cut), style);

            if (opera) span_(html, text.slice(cut + 1), style);

            wrapAt--;

            outPos += l;

          } else {

            outPos += l;

            span_(html, text, style);

            if (outPos == wrapAt && outPos == len) {

              setTextContent(anchor, eolSpanContent);

              html.appendChild(anchor);

            }

            // 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.markedSpans;

      var len = allText.length;

      function styleToClass(style) {

        if (!style) return null;

        return "cm-" + style.replace(/ +/g, " cm-");

      }

      if (!allText && wrapAt == null) {

        span(pre, " ");

      } 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(pre, str, styleToClass(style));

        }

      } else {

        marked.sort(function(a, b) { return a.from - b.from; });

        var pos = 0, i = 0, text = "", style, sg = 0;

        var nextChange = marked[0].from || 0, marks = [], markpos = 0;

        var advanceMarks = function() {

          var m;

          while (markpos < marked.length &&

                 ((m = marked[markpos]).from == pos || m.from == null)) {

            if (m.marker.type == "range") 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;

            if (to == null) 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) {

                var mark = marks[j];

                appliedStyle = (appliedStyle ? appliedStyle + " " : "") + mark.marker.style;

                if (mark.marker.endStyle && mark.to === Math.min(end, upto)) appliedStyle += " " + mark.marker.endStyle;

                if (mark.marker.startStyle && mark.from === pos) appliedStyle += " " + mark.marker.startStyle;

              }

              span(pre, 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 pre;

    },

    cleanUp: function() {

      this.parent = null;

      detachMarkedSpans(this);

    }

  };



  // 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 = lst(this.done), last = cur && lst(cur);

      var dtime = time - this.time;



      if (cur && !this.closed && this.compound) {

        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) {

    var b = e.which;

    if (b == null) {

      if (e.button & 1) b = 1;

      else if (e.button & 2) b = 3;

      else if (e.button & 4) b = 2;

    }

    if (mac && e.ctrlKey && b == 1) b = 3;

    return b;

  }



  // 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";}};



  // 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 = elt('div');

    return "draggable" in div || "dragDrop" in div;

  }();



  // Feature-detect whether newlines in textareas are converted to \r\n

  var lineSep = function () {

    var te = elt("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 eltOffset(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;

  }



  function eltText(node) {

    return node.textContent || node.innerText || node.nodeValue || "";

  }



  var spaceStrs = [""];

  function spaceStr(n) {

    while (spaceStrs.length <= n)

      spaceStrs.push(lst(spaceStrs) + " ");

    return spaceStrs[n];

  }



  function lst(arr) { return arr[arr.length-1]; }



  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};}



  function elt(tag, content, className, style) {

    var e = document.createElement(tag);

    if (className) e.className = className;

    if (style) e.style.cssText = style;

    if (typeof content == "string") setTextContent(e, content);

    else if (content) for (var i = 0; i < content.length; ++i) e.appendChild(content[i]);

    return e;

  }

  function removeChildren(e) {

    e.innerHTML = "";

    return e;

  }

  function removeChildrenAndAdd(parent, e) {

    removeChildren(parent).appendChild(e);

  }

  function setTextContent(e, str) {

    if (ie_lt9) {

      e.innerHTML = "";

      e.appendChild(document.createTextNode(str));

    } else e.textContent = str;

  }



  // 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() || /[\u4E00-\u9FA5]/.test(ch);

  }



  // 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, result = [], l = string.length;

    while (pos <= l) {

      var nl = string.indexOf("\n", pos);

      if (nl == -1) nl = string.length;

      var line = string.slice(pos, string.charAt(nl - 1) == "\r" ? nl - 1 : nl);

      var rt = line.indexOf("\r");

      if (rt != -1) {

        result.push(line.slice(0, rt));

        pos += rt + 1;

      } else {

        result.push(line);

        pos = nl + 1;

      }

    }

    return result;

  } : function(string){return string.split(/\r\n?|\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", 109: "-", 107: "=", 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;

  })();



  CodeMirror.version = "2.35";



  return CodeMirror;

})();

