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// CodeMirror version 2.24
//
// All functions that need access to the editor's state live inside
// the CodeMirror function. Below that, at the bottom of the file,
// some utilities are defined.

// CodeMirror is the only global var we claim
var CodeMirror = (function() {
  // This is the function that produces an editor instance. Its
  // closure is used to store the editor state.
  function CodeMirror(place, givenOptions) {
    // Determine effective options based on given values and defaults.
    var options = {}, defaults = CodeMirror.defaults;
    for (var opt in defaults)
      if (defaults.hasOwnProperty(opt))
        options[opt] = (givenOptions && givenOptions.hasOwnProperty(opt) ? givenOptions : defaults)[opt];

// The element in which the editor lives.
    var wrapper = document.createElement("div");
    wrapper.className = "CodeMirror" + (options.lineWrapping ? " CodeMirror-wrap" : "");
    // This mess creates the base DOM structure for the editor.
    wrapper.innerHTML =
      '<div style="overflow: hidden; position: relative; width: 3px; height: 0px;">' + // Wraps and hides input textarea
        '<textarea style="position: absolute; padding: 0; width: 1px; height: 1em" wrap="off" ' +
          'autocorrect="off" autocapitalize="off"></textarea></div>' +
      '<div class="CodeMirror-scroll" tabindex="-1">' +
        '<div style="position: relative">' + // Set to the height of the text, causes scrolling
          '<div style="position: relative">' + // Moved around its parent to cover visible view
            '<div class="CodeMirror-gutter"><div class="CodeMirror-gutter-text"></div></div>' +
            // Provides positioning relative to (visible) text origin
            '<div class="CodeMirror-lines"><div style="position: relative; z-index: 0">' +
              '<div style="position: absolute; width: 100%; height: 0; overflow: hidden; visibility: hidden;"></div>' +
              '<pre class="CodeMirror-cursor">&#160;</pre>' + // Absolutely positioned blinky cursor
              '<div style="position: relative; z-index: -1"></div><div></div>' + // DIVs containing the selection and the actual code
            '</div></div></div></div></div>';
    if (place.appendChild) place.appendChild(wrapper); else place(wrapper);
    // I've never seen more elegant code in my life.
    var inputDiv = wrapper.firstChild, input = inputDiv.firstChild,
        scroller = wrapper.lastChild, code = scroller.firstChild,
        mover = code.firstChild, gutter = mover.firstChild, gutterText = gutter.firstChild,
        lineSpace = gutter.nextSibling.firstChild, measure = lineSpace.firstChild,
        cursor = measure.nextSibling, selectionDiv = cursor.nextSibling,
        lineDiv = selectionDiv.nextSibling;
    themeChanged();
    // Needed to hide big blue blinking cursor on Mobile Safari
    if (ios) input.style.width = "0px";
    if (!webkit) lineSpace.draggable = true;
    lineSpace.style.outline = "none";
    if (options.tabindex != null) input.tabIndex = options.tabindex;
    if (options.autofocus) focusInput();
    if (!options.gutter && !options.lineNumbers) gutter.style.display = "none";
    // Needed to handle Tab key in KHTML
    if (khtml) inputDiv.style.height = "1px", inputDiv.style.position = "absolute";

// Check for problem with IE innerHTML not working when we have a
    // P (or similar) parent node.
    try { stringWidth("x"); }
    catch (e) {
      if (e.message.match(/runtime/i))
        e = new Error("A CodeMirror inside a P-style element does not work in Internet Explorer. (innerHTML bug)");
      throw e;
    }

// Delayed object wrap timeouts, making sure only one is active. blinker holds an interval.
    var poll = new Delayed(), highlight = new Delayed(), blinker;

// mode holds a mode API object. doc is the tree of Line objects,
    // work an array of lines that should be parsed, and history the
    // undo history (instance of History constructor).
    var mode, doc = new BranchChunk([new LeafChunk([new Line("")])]), work, focused;
    loadMode();
    // The selection. These are always maintained to point at valid
    // positions. Inverted is used to remember that the user is
    // selecting bottom-to-top.
    var sel = {from: {line: 0, ch: 0}, to: {line: 0, ch: 0}, inverted: false};
    // Selection-related flags. shiftSelecting obviously tracks
    // whether the user is holding shift.
    var shiftSelecting, lastClick, lastDoubleClick, lastScrollPos = 0, draggingText,
        overwrite = false, suppressEdits = false;
    // Variables used by startOperation/endOperation to track what
    // happened during the operation.
    var updateInput, userSelChange, changes, textChanged, selectionChanged, leaveInputAlone,
        gutterDirty, callbacks;
    // Current visible range (may be bigger than the view window).
    var displayOffset = 0, showingFrom = 0, showingTo = 0, lastSizeC = 0;
    // bracketHighlighted is used to remember that a bracket has been
    // marked.
    var bracketHighlighted;
    // Tracks the maximum line length so that the horizontal scrollbar
    // can be kept static when scrolling.
    var maxLine = "", maxWidth;
    var tabCache = {};

// Initialize the content.
    operation(function(){setValue(options.value || ""); updateInput = false;})();
    var history = new History();

// Register our event handlers.
    connect(scroller, "mousedown", operation(onMouseDown));
    connect(scroller, "dblclick", operation(onDoubleClick));
    connect(lineSpace, "selectstart", e_preventDefault);
    // Gecko browsers fire contextmenu *after* opening the menu, at
    // which point we can't mess with it anymore. Context menu is
    // handled in onMouseDown for Gecko.
    if (!gecko) connect(scroller, "contextmenu", onContextMenu);
    connect(scroller, "scroll", function() {
      lastScrollPos = scroller.scrollTop;
      updateDisplay([]);
      if (options.fixedGutter) gutter.style.left = scroller.scrollLeft + "px";
      if (options.onScroll) options.onScroll(instance);
    });
    connect(window, "resize", function() {updateDisplay(true);});
    connect(input, "keyup", operation(onKeyUp));
    connect(input, "input", fastPoll);
    connect(input, "keydown", operation(onKeyDown));
    connect(input, "keypress", operation(onKeyPress));
    connect(input, "focus", onFocus);
    connect(input, "blur", onBlur);

if (options.dragDrop) {
      connect(lineSpace, "dragstart", onDragStart);
      function drag_(e) {
        if (options.onDragEvent && options.onDragEvent(instance, addStop(e))) return;
        e_stop(e);
      }
      connect(scroller, "dragenter", drag_);
      connect(scroller, "dragover", drag_);
      connect(scroller, "drop", operation(onDrop));
    }
    connect(scroller, "paste", function(){focusInput(); fastPoll();});
    connect(input, "paste", fastPoll);
    connect(input, "cut", operation(function(){
      if (!options.readOnly) replaceSelection("");
    }));

// Needed to handle Tab key in KHTML
    if (khtml) connect(code, "mouseup", function() {
        if (document.activeElement == input) input.blur();
        focusInput();
    });

// IE throws unspecified error in certain cases, when
    // trying to access activeElement before onload
    var hasFocus; try { hasFocus = (document.activeElement == input); } catch(e) { }
    if (hasFocus || options.autofocus) setTimeout(onFocus, 20);
    else onBlur();

lineCount: function() {return doc.size;},
      clipPos: clipPos,
      getCursor: function(start) {
        if (start == null) start = sel.inverted;
        return copyPos(start ? sel.from : sel.to);
      },
      somethingSelected: function() {return !posEq(sel.from, sel.to);},
      setCursor: operation(function(line, ch, user) {
        if (ch == null && typeof line.line == "number") setCursor(line.line, line.ch, user);
        else setCursor(line, ch, user);
      }),
      setSelection: operation(function(from, to, user) {
        (user ? setSelectionUser : setSelection)(clipPos(from), clipPos(to || from));
      }),
      getLine: function(line) {if (isLine(line)) return getLine(line).text;},
      getLineHandle: function(line) {if (isLine(line)) return getLine(line);},
      setLine: operation(function(line, text) {
        if (isLine(line)) replaceRange(text, {line: line, ch: 0}, {line: line, ch: getLine(line).text.length});
      }),
      removeLine: operation(function(line) {
        if (isLine(line)) replaceRange("", {line: line, ch: 0}, clipPos({line: line+1, ch: 0}));
      }),
      replaceRange: operation(replaceRange),
      getRange: function(from, to) {return getRange(clipPos(from), clipPos(to));},

triggerOnKeyDown: operation(onKeyDown),
      execCommand: function(cmd) {return commands[cmd](instance);},
      // Stuff used by commands, probably not much use to outside code.
      moveH: operation(moveH),
      deleteH: operation(deleteH),
      moveV: operation(moveV),
      toggleOverwrite: function() {
        if(overwrite){
          overwrite = false;
          cursor.className = cursor.className.replace(" CodeMirror-overwrite", "");
        } else {
          overwrite = true;
          cursor.className += " CodeMirror-overwrite";
        }
      },

posFromIndex: function(off) {
        var lineNo = 0, ch;
        doc.iter(0, doc.size, function(line) {
          var sz = line.text.length + 1;
          if (sz > off) { ch = off; return true; }
          off -= sz;
          ++lineNo;
        });
        return clipPos({line: lineNo, ch: ch});
      },
      indexFromPos: function (coords) {
        if (coords.line < 0 || coords.ch < 0) return 0;
        var index = coords.ch;
        doc.iter(0, coords.line, function (line) {
          index += line.text.length + 1;
        });
        return index;
      },
      scrollTo: function(x, y) {
        if (x != null) scroller.scrollLeft = x;
        if (y != null) scroller.scrollTop = y;
        updateDisplay([]);
      },

operation: function(f){return operation(f)();},
      compoundChange: function(f){return compoundChange(f);},
      refresh: function(){
        updateDisplay(true);
        if (scroller.scrollHeight > lastScrollPos)
          scroller.scrollTop = lastScrollPos;
      },
      getInputField: function(){return input;},
      getWrapperElement: function(){return wrapper;},
      getScrollerElement: function(){return scroller;},
      getGutterElement: function(){return gutter;}
    };

function getLine(n) { return getLineAt(doc, n); }
    function updateLineHeight(line, height) {
      gutterDirty = true;
      var diff = height - line.height;
      for (var n = line; n; n = n.parent) n.height += diff;
    }

function onMouseDown(e) {
      setShift(e_prop(e, "shiftKey"));
      // Check whether this is a click in a widget
      for (var n = e_target(e); n != wrapper; n = n.parentNode)
        if (n.parentNode == code && n != mover) return;

// See if this is a click in the gutter
      for (var n = e_target(e); n != wrapper; n = n.parentNode)
        if (n.parentNode == gutterText) {
          if (options.onGutterClick)
            options.onGutterClick(instance, indexOf(gutterText.childNodes, n) + showingFrom, e);
          return e_preventDefault(e);
        }

var start = posFromMouse(e);

switch (e_button(e)) {
      case 3:
        if (gecko && !mac) onContextMenu(e);
        return;
      case 2:
        if (start) setCursor(start.line, start.ch, true);
        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();

// Use dummy image instead of default browsers image.
      if (gecko || chrome) {
        var img = document.createElement('img');
        img.scr = 'data:image/gif;base64,R0lGODdhAgACAIAAAAAAAP///ywAAAAAAgACAAACAoRRADs='; //1x1 image
        e.dataTransfer.setDragImage(img, 0, 0);
      }
    }

var name = keyNames[e_prop(e, "keyCode")], handled = false;
      if (name == null || e.altGraphKey) return false;
      if (e_prop(e, "altKey")) name = "Alt-" + name;
      if (e_prop(e, "ctrlKey")) name = "Ctrl-" + name;
      if (e_prop(e, "metaKey")) name = "Cmd-" + name;

var stopped = false;
      function stop() { stopped = true; }

if (e_prop(e, "shiftKey")) {
        handled = lookupKey("Shift-" + name, options.extraKeys, options.keyMap,
                            function(b) {return doHandleBinding(b, true);}, stop)
               || lookupKey(name, options.extraKeys, options.keyMap, function(b) {
                 if (typeof b == "string" && /^go[A-Z]/.test(b)) return doHandleBinding(b);
               }, stop);
      } else {
        handled = lookupKey(name, options.extraKeys, options.keyMap, doHandleBinding, stop);
      }
      if (stopped) handled = false;
      if (handled) {
        e_preventDefault(e);
        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);
      return handled;
    }

// Replace the range from from to to by the strings in newText.
    // Afterwards, set the selection to selFrom, selTo.
    function updateLines(from, to, newText, selFrom, selTo) {
      if (suppressEdits) return;
      if (history) {
        var old = [];
        doc.iter(from.line, to.line + 1, function(line) { old.push(line.text); });
        history.addChange(from.line, newText.length, old);
        while (history.done.length > options.undoDepth) history.done.shift();
      }
      updateLinesNoUndo(from, to, newText, selFrom, selTo);
    }
    function unredoHelper(from, to) {
      if (!from.length) return;
      var set = from.pop(), out = [];
      for (var i = set.length - 1; i >= 0; i -= 1) {
        var change = set[i];
        var replaced = [], end = change.start + change.added;
        doc.iter(change.start, end, function(line) { replaced.push(line.text); });
        out.push({start: change.start, added: change.old.length, old: replaced});
        var pos = clipPos({line: change.start + change.old.length - 1,
                           ch: editEnd(replaced[replaced.length-1], change.old[change.old.length-1])});
        updateLinesNoUndo({line: change.start, ch: 0}, {line: end - 1, ch: getLine(end-1).text.length}, change.old, pos, pos);
      }
      updateInput = true;
      to.push(out);
    }
    function undo() {unredoHelper(history.done, history.undone);}
    function redo() {unredoHelper(history.undone, history.done);}

function updateLinesNoUndo(from, to, newText, selFrom, selTo) {
      if (suppressEdits) return;
      var recomputeMaxLength = false, maxLineLength = maxLine.length;
      if (!options.lineWrapping)
        doc.iter(from.line, to.line + 1, function(line) {
          if (line.text.length == maxLineLength) {recomputeMaxLength = true; return true;}
        });
      if (from.line != to.line || newText.length > 1) gutterDirty = true;

// Add these lines to the work array, so that they will be
      // highlighted. Adjust work lines if lines were added/removed.
      var newWork = [], lendiff = newText.length - nlines - 1;
      for (var i = 0, l = work.length; i < l; ++i) {
        var task = work[i];
        if (task < from.line) newWork.push(task);
        else if (task > to.line) newWork.push(task + lendiff);
      }
      var hlEnd = from.line + Math.min(newText.length, 500);
      highlightLines(from.line, hlEnd);
      newWork.push(hlEnd);
      work = newWork;
      startWorker(100);
      // Remember that these lines changed, for updating the display
      changes.push({from: from.line, to: to.line + 1, diff: lendiff});
      var changeObj = {from: from, to: to, text: newText};
      if (textChanged) {
        for (var cur = textChanged; cur.next; cur = cur.next) {}
        cur.next = changeObj;
      } else textChanged = changeObj;

// Update the selection
      function updateLine(n) {return n <= Math.min(to.line, to.line + lendiff) ? n : n + lendiff;}
      setSelection(selFrom, selTo, updateLine(sel.from.line), updateLine(sel.to.line));

// Make sure the scroll-size div has the correct height.
      if (scroller.clientHeight)
        code.style.height = (doc.height * textHeight() + 2 * paddingTop()) + "px";
    }

// Previnput is a hack to work with IME. If we reset the textarea
    // on every change, that breaks IME. So we look for changes
    // compared to the previous content instead. (Modern browsers have
    // events that indicate IME taking place, but these are not widely
    // supported or compatible enough yet to rely on.)
    var prevInput = "";
    function readInput() {
      if (leaveInputAlone || !focused || hasSelection(input) || options.readOnly) return false;
      var text = input.value;
      if (text == prevInput) return false;
      shiftSelecting = null;
      var same = 0, l = Math.min(prevInput.length, text.length);
      while (same < l && prevInput[same] == text[same]) ++same;
      if (same < prevInput.length)
        sel.from = {line: sel.from.line, ch: sel.from.ch - (prevInput.length - same)};
      else if (overwrite && posEq(sel.from, sel.to))
        sel.to = {line: sel.to.line, ch: Math.min(getLine(sel.to.line).text.length, sel.to.ch + (text.length - same))};
      replaceSelection(text.slice(same), "end");
      prevInput = text;
      return true;
    }
    function resetInput(user) {
      if (!posEq(sel.from, sel.to)) {
        prevInput = "";
        input.value = getSelection();
        selectInput(input);
      } else if (user) prevInput = input.value = "";
    }

function focusInput() {
      if (options.readOnly != "nocursor") input.focus();
    }

var screenw = scroller.clientWidth, screenleft = scroller.scrollLeft;
      var gutterw = options.fixedGutter ? gutter.clientWidth : 0;
      var atLeft = x1 < gutterw + pl + 10;
      if (x1 < screenleft + gutterw || atLeft) {
        if (atLeft) x1 = 0;
        scroller.scrollLeft = Math.max(0, x1 - 10 - gutterw);
        scrolled = true;
      }
      else if (x2 > screenw + screenleft - 3) {
        scroller.scrollLeft = x2 + 10 - screenw;
        scrolled = true;
        if (x2 > code.clientWidth) result = false;
      }
      if (scrolled && options.onScroll) options.onScroll(instance);
      return result;
    }

// Create a range of theoretically intact lines, and punch holes
      // in that using the change info.
      var intact = changes === true ? [] :
        computeIntact([{from: showingFrom, to: showingTo, domStart: 0}], changes);
      // Clip off the parts that won't be visible
      var intactLines = 0;
      for (var i = 0; i < intact.length; ++i) {
        var range = intact[i];
        if (range.from < from) {range.domStart += (from - range.from); range.from = from;}
        if (range.to > to) range.to = to;
        if (range.from >= range.to) intact.splice(i--, 1);
        else intactLines += range.to - range.from;
      }
      if (intactLines == to - from && from == showingFrom && to == showingTo) return;
      intact.sort(function(a, b) {return a.domStart - b.domStart;});

var th = textHeight(), gutterDisplay = gutter.style.display;
      lineDiv.style.display = "none";
      patchDisplay(from, to, intact);
      lineDiv.style.display = gutter.style.display = "";

// Position the mover div to align with the lines it's supposed
      // to be showing (which will cover the visible display)
      var different = from != showingFrom || to != showingTo || lastSizeC != scroller.clientHeight + th;
      // This is just a bogus formula that detects when the editor is
      // resized or the font size changes.
      if (different) lastSizeC = scroller.clientHeight + th;
      showingFrom = from; showingTo = to;
      displayOffset = heightAtLine(doc, from);
      mover.style.top = (displayOffset * th) + "px";
      if (scroller.clientHeight)
        code.style.height = (doc.height * th + 2 * paddingTop()) + "px";

// Since this is all rather error prone, it is honoured with the
      // only assertion in the whole file.
      if (lineDiv.childNodes.length != showingTo - showingFrom)
        throw new Error("BAD PATCH! " + JSON.stringify(intact) + " size=" + (showingTo - showingFrom) +
                        " nodes=" + lineDiv.childNodes.length);

if (options.lineWrapping) {
        checkHeights();
      } else {
        if (maxWidth == null) maxWidth = stringWidth(maxLine);
        if (maxWidth > scroller.clientWidth) {
          lineSpace.style.width = maxWidth + "px";
          // Needed to prevent odd wrapping/hiding of widgets placed in here.
          code.style.width = "";
          code.style.width = scroller.scrollWidth + "px";
        } else {
          lineSpace.style.width = code.style.width = "";
        }
      }

gutter.style.display = gutterDisplay;
      if (different || gutterDirty) {
        // If the gutter grew in size, re-check heights. If those changed, re-draw gutter.
        updateGutter() && options.lineWrapping && checkHeights() && updateGutter();
      }
      updateSelection();
      if (!suppressCallback && options.onUpdate) options.onUpdate(instance);
      return true;
    }

// 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 indentLine(n, how) {
      if (!how) how = "add";
      if (how == "smart") {
        if (!mode.indent) how = "prev";
        else var state = getStateBefore(n);
      }

var line = getLine(n), curSpace = line.indentation(options.tabSize),
          curSpaceString = line.text.match(/^\s*/)[0], indentation;
      if (how == "prev") {
        if (n) indentation = getLine(n-1).indentation(options.tabSize);
        else indentation = 0;
      }
      else if (how == "smart") indentation = mode.indent(state, line.text.slice(curSpaceString.length), line.text);
      else if (how == "add") indentation = curSpace + options.indentUnit;
      else if (how == "subtract") indentation = curSpace - options.indentUnit;
      indentation = Math.max(0, indentation);
      var diff = indentation - curSpace;

if (!diff) {
        if (sel.from.line != n && sel.to.line != n) return;
        var indentString = curSpaceString;
      }
      else {
        var indentString = "", pos = 0;
        if (options.indentWithTabs)
          for (var i = Math.floor(indentation / options.tabSize); i; --i) {pos += options.tabSize; indentString += "\t";}
        while (pos < indentation) {++pos; indentString += " ";}
      }

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

function setBookmark(pos) {
      pos = clipPos(pos);
      var bm = new Bookmark(pos.ch);
      getLine(pos.line).addMark(bm);
      return bm;
    }

function findMarksAt(pos) {
      pos = clipPos(pos);
      var markers = [], marked = getLine(pos.line).marked;
      if (!marked) return markers;
      for (var i = 0, e = marked.length; i < e; ++i) {
        var m = marked[i];
        if ((m.from == null || m.from <= pos.ch) &&
            (m.to == null || m.to >= pos.ch))
          markers.push(m.marker || m);
      }
      return markers;
    }

var cachedHeight, cachedHeightFor, measureText;
    function textHeight() {
      if (measureText == null) {
        measureText = "<pre>";
        for (var i = 0; i < 49; ++i) measureText += "x<br/>";
        measureText += "x</pre>";
      }
      var offsetHeight = lineDiv.clientHeight;
      if (offsetHeight == cachedHeightFor) return cachedHeight;
      cachedHeightFor = offsetHeight;
      measure.innerHTML = measureText;
      cachedHeight = measure.firstChild.offsetHeight / 50 || 1;
      measure.innerHTML = "";
      return cachedHeight;
    }
    var cachedWidth, cachedWidthFor = 0;
    function charWidth() {
      if (scroller.clientWidth == cachedWidthFor) return cachedWidth;
      cachedWidthFor = scroller.clientWidth;
      return (cachedWidth = stringWidth("x"));
    }
    function paddingTop() {return lineSpace.offsetTop;}
    function paddingLeft() {return lineSpace.offsetLeft;}

var oldCSS = input.style.cssText;
      inputDiv.style.position = "absolute";
      input.style.cssText = "position: fixed; width: 30px; height: 30px; top: " + (e.clientY - 5) +
        "px; left: " + (e.clientX - 5) + "px; z-index: 1000; background: white; " +
        "border-width: 0; outline: none; overflow: hidden; opacity: .05; filter: alpha(opacity=5);";
      leaveInputAlone = true;
      var val = input.value = getSelection();
      focusInput();
      selectInput(input);
      function rehide() {
        var newVal = splitLines(input.value).join("\n");
        if (newVal != val) operation(replaceSelection)(newVal, "end");
        inputDiv.style.position = "relative";
        input.style.cssText = oldCSS;
        if (ie_lt9) scroller.scrollTop = scrollPos;
        leaveInputAlone = false;
        resetInput(true);
        slowPoll();
      }

if (gecko) {
        e_stop(e);
        var mouseup = connect(window, "mouseup", function() {
          mouseup();
          setTimeout(rehide, 20);
        }, true);
      } else {
        setTimeout(rehide, 50);
      }
    }

// Cursor-blinking
    function restartBlink() {
      clearInterval(blinker);
      var on = true;
      cursor.style.visibility = "";
      blinker = setInterval(function() {
        cursor.style.visibility = (on = !on) ? "" : "hidden";
      }, 650);
    }

// Finds the line to start with when starting a parse. Tries to
    // find a line with a stateAfter, so that it can start with a
    // valid state. If that fails, it returns the line with the
    // smallest indentation, which tends to need the least context to
    // parse correctly.
    function findStartLine(n) {
      var minindent, minline;
      for (var search = n, lim = n - 40; search > lim; --search) {
        if (search == 0) return 0;
        var line = getLine(search-1);
        if (line.stateAfter) return search;
        var indented = line.indentation(options.tabSize);
        if (minline == null || minindent > indented) {
          minline = search - 1;
          minindent = indented;
        }
      }
      return minline;
    }
    function getStateBefore(n) {
      var start = findStartLine(n), state = start && getLine(start-1).stateAfter;
      if (!state) state = startState(mode);
      else state = copyState(mode, state);
      doc.iter(start, n, function(line) {
        line.highlight(mode, state, options.tabSize);
        line.stateAfter = copyState(mode, state);
      });
      if (start < n) changes.push({from: start, to: n});
      if (n < doc.size && !getLine(n).stateAfter) work.push(n);
      return state;
    }
    function highlightLines(start, end) {
      var state = getStateBefore(start);
      doc.iter(start, end, function(line) {
        line.highlight(mode, state, options.tabSize);
        line.stateAfter = copyState(mode, state);
      });
    }
    function highlightWorker() {
      var end = +new Date + options.workTime;
      var foundWork = work.length;
      while (work.length) {
        if (!getLine(showingFrom).stateAfter) var task = showingFrom;
        else var task = work.pop();
        if (task >= doc.size) continue;
        var start = findStartLine(task), state = start && getLine(start-1).stateAfter;
        if (state) state = copyState(mode, state);
        else state = startState(mode);

// Operations are used to wrap changes in such a way that each
    // change won't have to update the cursor and display (which would
    // be awkward, slow, and error-prone), but instead updates are
    // batched and then all combined and executed at once.
    function startOperation() {
      updateInput = userSelChange = textChanged = null;
      changes = []; selectionChanged = false; callbacks = [];
    }
    function endOperation() {
      var reScroll = false, updated;
      if (selectionChanged) reScroll = !scrollCursorIntoView();
      if (changes.length) updated = updateDisplay(changes, true);
      else {
        if (selectionChanged) updateSelection();
        if (gutterDirty) updateGutter();
      }
      if (reScroll) scrollCursorIntoView();
      if (selectionChanged) {scrollEditorIntoView(); restartBlink();}

if (focused && !leaveInputAlone &&
          (updateInput === true || (updateInput !== false && selectionChanged)))
        resetInput(userSelChange);

if (selectionChanged && options.matchBrackets)
        setTimeout(operation(function() {
          if (bracketHighlighted) {bracketHighlighted(); bracketHighlighted = null;}
          if (posEq(sel.from, sel.to)) matchBrackets(false);
        }), 20);
      var tc = textChanged, cbs = callbacks; // these can be reset by callbacks
      if (selectionChanged && options.onCursorActivity)
        options.onCursorActivity(instance);
      if (tc && options.onChange && instance)
        options.onChange(instance, tc);
      for (var i = 0; i < cbs.length; ++i) cbs[i](instance);
      if (updated && options.onUpdate) options.onUpdate(instance);
    }
    var nestedOperation = 0;
    function operation(f) {
      return function() {
        if (!nestedOperation++) startOperation();
        try {var result = f.apply(this, arguments);}
        finally {if (!--nestedOperation) endOperation();}
        return result;
      };
    }

function compoundChange(f) {
      history.startCompound();
      try { return f(); } finally { history.endCompound(); }
    }

for (var ext in extensions)
      if (extensions.propertyIsEnumerable(ext) &&
          !instance.propertyIsEnumerable(ext))
        instance[ext] = extensions[ext];
    return instance;
  } // (end of function CodeMirror)

// The default configuration options.
  CodeMirror.defaults = {
    value: "",
    mode: null,
    theme: "default",
    indentUnit: 2,
    indentWithTabs: false,
    smartIndent: true,
    tabSize: 4,
    keyMap: "default",
    extraKeys: null,
    electricChars: true,
    autoClearEmptyLines: false,
    onKeyEvent: null,
    onDragEvent: null,
    lineWrapping: false,
    lineNumbers: false,
    gutter: false,
    fixedGutter: false,
    firstLineNumber: 1,
    readOnly: false,
    dragDrop: true,
    onChange: null,
    onCursorActivity: null,
    onGutterClick: null,
    onHighlightComplete: null,
    onUpdate: null,
    onFocus: null, onBlur: null, onScroll: null,
    matchBrackets: false,
    workTime: 100,
    workDelay: 200,
    pollInterval: 100,
    undoDepth: 40,
    tabindex: null,
    autofocus: null
  };

var ios = /AppleWebKit/.test(navigator.userAgent) && /Mobile\/\w+/.test(navigator.userAgent);
  var mac = ios || /Mac/.test(navigator.platform);
  var win = /Win/.test(navigator.platform);

// Known modes, by name and by MIME
  var modes = CodeMirror.modes = {}, mimeModes = CodeMirror.mimeModes = {};
  CodeMirror.defineMode = function(name, mode) {
    if (!CodeMirror.defaults.mode && name != "null") CodeMirror.defaults.mode = name;
    if (arguments.length > 2) {
      mode.dependencies = [];
      for (var i = 2; i < arguments.length; ++i) mode.dependencies.push(arguments[i]);
    }
    modes[name] = mode;
  };
  CodeMirror.defineMIME = function(mime, spec) {
    mimeModes[mime] = spec;
  };
  CodeMirror.resolveMode = function(spec) {
    if (typeof spec == "string" && mimeModes.hasOwnProperty(spec))
      spec = mimeModes[spec];
    else if (typeof spec == "string" && /^[\w\-]+\/[\w\-]+\+xml$/.test(spec))
      return CodeMirror.resolveMode("application/xml");
    if (typeof spec == "string") return {name: spec};
    else return spec || {name: "null"};
  };
  CodeMirror.getMode = function(options, spec) {
    var spec = CodeMirror.resolveMode(spec);
    var mfactory = modes[spec.name];
    if (!mfactory) return CodeMirror.getMode(options, "text/plain");
    return mfactory(options, spec);
  };
  CodeMirror.listModes = function() {
    var list = [];
    for (var m in modes)
      if (modes.propertyIsEnumerable(m)) list.push(m);
    return list;
  };
  CodeMirror.listMIMEs = function() {
    var list = [];
    for (var m in mimeModes)
      if (mimeModes.propertyIsEnumerable(m)) list.push({mime: m, mode: mimeModes[m]});
    return list;
  };

var extensions = CodeMirror.extensions = {};
  CodeMirror.defineExtension = function(name, func) {
    extensions[name] = func;
  };

CodeMirror.fromTextArea = function(textarea, options) {
    if (!options) options = {};
    options.value = textarea.value;
    if (!options.tabindex && textarea.tabindex)
      options.tabindex = textarea.tabindex;
    if (options.autofocus == null && textarea.getAttribute("autofocus") != null)
      options.autofocus = true;

textarea.style.display = "none";
    var instance = CodeMirror(function(node) {
      textarea.parentNode.insertBefore(node, textarea.nextSibling);
    }, options);
    instance.save = save;
    instance.getTextArea = function() { return textarea; };
    instance.toTextArea = function() {
      save();
      textarea.parentNode.removeChild(instance.getWrapperElement());
      textarea.style.display = "";
      if (textarea.form) {
        rmSubmit();
        if (typeof textarea.form.submit == "function")
          textarea.form.submit = realSubmit;
      }
    };
    return instance;
  };

// Utility functions for working with state. Exported because modes
  // sometimes need to do this.
  function copyState(mode, state) {
    if (state === true) return state;
    if (mode.copyState) return mode.copyState(state);
    var nstate = {};
    for (var n in state) {
      var val = state[n];
      if (val instanceof Array) val = val.concat([]);
      nstate[n] = val;
    }
    return nstate;
  }
  CodeMirror.copyState = copyState;
  function startState(mode, a1, a2) {
    return mode.startState ? mode.startState(a1, a2) : true;
  }
  CodeMirror.startState = startState;

// The character stream used by a mode's parser.
  function StringStream(string, tabSize) {
    this.pos = this.start = 0;
    this.string = string;
    this.tabSize = tabSize || 8;
  }
  StringStream.prototype = {
    eol: function() {return this.pos >= this.string.length;},
    sol: function() {return this.pos == 0;},
    peek: function() {return this.string.charAt(this.pos);},
    next: function() {
      if (this.pos < this.string.length)
        return this.string.charAt(this.pos++);
    },
    eat: function(match) {
      var ch = this.string.charAt(this.pos);
      if (typeof match == "string") var ok = ch == match;
      else var ok = ch && (match.test ? match.test(ch) : match(ch));
      if (ok) {++this.pos; return ch;}
    },
    eatWhile: function(match) {
      var start = this.pos;
      while (this.eat(match)){}
      return this.pos > start;
    },
    eatSpace: function() {
      var start = this.pos;
      while (/[\s\u00a0]/.test(this.string.charAt(this.pos))) ++this.pos;
      return this.pos > start;
    },
    skipToEnd: function() {this.pos = this.string.length;},
    skipTo: function(ch) {
      var found = this.string.indexOf(ch, this.pos);
      if (found > -1) {this.pos = found; return true;}
    },
    backUp: function(n) {this.pos -= n;},
    column: function() {return countColumn(this.string, this.start, this.tabSize);},
    indentation: function() {return countColumn(this.string, null, this.tabSize);},
    match: function(pattern, consume, caseInsensitive) {
      if (typeof pattern == "string") {
        function cased(str) {return caseInsensitive ? str.toLowerCase() : str;}
        if (cased(this.string).indexOf(cased(pattern), this.pos) == this.pos) {
          if (consume !== false) this.pos += pattern.length;
          return true;
        }
      }
      else {
        var match = this.string.slice(this.pos).match(pattern);
        if (match && consume !== false) this.pos += match[0].length;
        return match;
      }
    },
    current: function(){return this.string.slice(this.start, this.pos);}
  };
  CodeMirror.StringStream = StringStream;

// Line objects. These hold state related to a line, including
  // highlighting info (the styles array).
  function Line(text, styles) {
    this.styles = styles || [text, null];
    this.text = text;
    this.height = 1;
    this.marked = this.gutterMarker = this.className = this.bgClassName = this.handlers = null;
    this.stateAfter = this.parent = this.hidden = null;
  }
  Line.inheritMarks = function(text, orig) {
    var ln = new Line(text), mk = orig && orig.marked;
    if (mk) {
      for (var i = 0; i < mk.length; ++i) {
        if (mk[i].to == null && mk[i].style) {
          var newmk = ln.marked || (ln.marked = []), mark = mk[i];
          var nmark = mark.dup(); newmk.push(nmark); nmark.attach(ln);
        }
      }
    }
    return ln;
  }
  Line.prototype = {
    // Replace a piece of a line, keeping the styles around it intact.
    replace: function(from, to_, text) {
      var st = [], mk = this.marked, to = to_ == null ? this.text.length : to_;
      copyStyles(0, from, this.styles, st);
      if (text) st.push(text, null);
      copyStyles(to, this.text.length, this.styles, st);
      this.styles = st;
      this.text = this.text.slice(0, from) + text + this.text.slice(to);
      this.stateAfter = null;
      if (mk) {
        var diff = text.length - (to - from);
        for (var i = 0; i < mk.length; ++i) {
          var mark = mk[i];
          mark.clipTo(from == null, from || 0, to_ == null, to, diff);
          if (mark.isDead()) {mark.detach(this); mk.splice(i--, 1);}
        }
      }
    },
    // Split a part off a line, keeping styles and markers intact.
    split: function(pos, textBefore) {
      var st = [textBefore, null], mk = this.marked;
      copyStyles(pos, this.text.length, this.styles, st);
      var taken = new Line(textBefore + this.text.slice(pos), st);
      if (mk) {
        for (var i = 0; i < mk.length; ++i) {
          var mark = mk[i];
          var newmark = mark.split(pos, textBefore.length);
          if (newmark) {
            if (!taken.marked) taken.marked = [];
            taken.marked.push(newmark); newmark.attach(taken);
            if (newmark == mark) mk.splice(i--, 1);
          }
        }
      }
      return taken;
    },
    append: function(line) {
      var mylen = this.text.length, mk = line.marked, mymk = this.marked;
      this.text += line.text;
      copyStyles(0, line.text.length, line.styles, this.styles);
      if (mymk) {
        for (var i = 0; i < mymk.length; ++i)
          if (mymk[i].to == null) mymk[i].to = mylen;
      }
      if (mk && mk.length) {
        if (!mymk) this.marked = mymk = [];
        outer: for (var i = 0; i < mk.length; ++i) {
          var mark = mk[i];
          if (!mark.from) {
            for (var j = 0; j < mymk.length; ++j) {
              var mymark = mymk[j];
              if (mymark.to == mylen && mymark.sameSet(mark)) {
                mymark.to = mark.to == null ? null : mark.to + mylen;
                if (mymark.isDead()) {
                  mymark.detach(this);
                  mk.splice(i--, 1);
                }
                continue outer;
              }
            }
          }
          mymk.push(mark);
          mark.attach(this);
          mark.from += mylen;
          if (mark.to != null) mark.to += mylen;
        }
      }
    },
    fixMarkEnds: function(other) {
      var mk = this.marked, omk = other.marked;
      if (!mk) return;
      for (var i = 0; i < mk.length; ++i) {
        var mark = mk[i], close = mark.to == null;
        if (close && omk) {
          for (var j = 0; j < omk.length; ++j)
            if (omk[j].sameSet(mark)) {close = false; break;}
        }
        if (close) mark.to = this.text.length;
      }
    },
    fixMarkStarts: function() {
      var mk = this.marked;
      if (!mk) return;
      for (var i = 0; i < mk.length; ++i)
        if (mk[i].from == null) mk[i].from = 0;
    },
    addMark: function(mark) {
      mark.attach(this);
      if (this.marked == null) this.marked = [];
      this.marked.push(mark);
      this.marked.sort(function(a, b){return (a.from || 0) - (b.from || 0);});
    },
    // Run the given mode's parser over a line, update the styles
    // array, which contains alternating fragments of text and CSS
    // classes.
    highlight: function(mode, state, tabSize) {
      var stream = new StringStream(this.text, tabSize), st = this.styles, pos = 0;
      var changed = false, curWord = st[0], prevWord;
      if (this.text == "" && mode.blankLine) mode.blankLine(state);
      while (!stream.eol()) {
        var style = mode.token(stream, state);
        var substr = this.text.slice(stream.start, stream.pos);
        stream.start = stream.pos;
        if (pos && st[pos-1] == style)
          st[pos-2] += substr;
        else if (substr) {
          if (!changed && (st[pos+1] != style || (pos && st[pos-2] != prevWord))) changed = true;
          st[pos++] = substr; st[pos++] = style;
          prevWord = curWord; curWord = st[pos];
        }
        // Give up when line is ridiculously long
        if (stream.pos > 5000) {
          st[pos++] = this.text.slice(stream.pos); st[pos++] = null;
          break;
        }
      }
      if (st.length != pos) {st.length = pos; changed = true;}
      if (pos && st[pos-2] != prevWord) changed = true;
      // Short lines with simple highlights return null, and are
      // counted as changed by the driver because they are likely to
      // highlight the same way in various contexts.
      return changed || (st.length < 5 && this.text.length < 10 ? null : false);
    },
    // Fetch the parser token for a given character. Useful for hacks
    // that want to inspect the mode state (say, for completion).
    getTokenAt: function(mode, state, ch) {
      var txt = this.text, stream = new StringStream(txt);
      while (stream.pos < ch && !stream.eol()) {
        stream.start = stream.pos;
        var style = mode.token(stream, state);
      }
      return {start: stream.start,
              end: stream.pos,
              string: stream.current(),
              className: style || null,
              state: state};
    },
    indentation: function(tabSize) {return countColumn(this.text, null, tabSize);},
    // Produces an HTML fragment for the line, taking selection,
    // marking, and highlighting into account.
    getHTML: function(makeTab, wrapAt, wrapId, wrapWBR) {
      var html = [], first = true, col = 0;
      function span_(text, style) {
        if (!text) return;
        // Work around a bug where, in some compat modes, IE ignores leading spaces
        if (first && ie && text.charAt(0) == " ") text = "\u00a0" + text.slice(1);
        first = false;
        if (text.indexOf("\t") == -1) {
          col += text.length;
          var escaped = htmlEscape(text);
        } else {
          var escaped = "";
          for (var pos = 0;;) {
            var idx = text.indexOf("\t", pos);
            if (idx == -1) {
              escaped += htmlEscape(text.slice(pos));
              col += text.length - pos;
              break;
            } else {
              col += idx - pos;
              var tab = makeTab(col);
              escaped += htmlEscape(text.slice(pos, idx)) + tab.html;
              col += tab.width;
              pos = idx + 1;
            }
          }
        }
        if (style) html.push('<span class="', style, '">', escaped, "</span>");
        else html.push(escaped);
      }
      var span = span_;
      if (wrapAt != null) {
        var outPos = 0, open = "<span id=\"" + wrapId + "\">";
        span = function(text, style) {
          var l = text.length;
          if (wrapAt >= outPos && wrapAt < outPos + l) {
            if (wrapAt > outPos) {
              span_(text.slice(0, wrapAt - outPos), style);
              // See comment at the definition of spanAffectsWrapping
              if (wrapWBR) html.push("<wbr>");
            }
            html.push(open);
            span_(text.slice(wrapAt - outPos), style);
            html.push("</span>");
            wrapAt--;
            outPos += l;
          } else {
            outPos += l;
            span_(text, style);
            // Output empty wrapper when at end of line
            if (outPos == wrapAt && outPos == len) html.push(open + "</span>");
            // Stop outputting HTML when gone sufficiently far beyond measure
            else if (outPos > wrapAt + 10 && /\s/.test(text)) span = function(){};
          }
        }
      }

var st = this.styles, allText = this.text, marked = this.marked;
      var len = allText.length;
      function styleToClass(style) {
        if (!style) return null;
        return "cm-" + style.replace(/ +/g, " cm-");
      }

if (!allText && wrapAt == null) {
        span(" ");
      } else if (!marked || !marked.length) {
        for (var i = 0, ch = 0; ch < len; i+=2) {
          var str = st[i], style = st[i+1], l = str.length;
          if (ch + l > len) str = str.slice(0, len - ch);
          ch += l;
          span(str, styleToClass(style));
        }
      } else {
        var pos = 0, i = 0, text = "", style, sg = 0;
        var nextChange = marked[0].from || 0, marks = [], markpos = 0;
        function advanceMarks() {
          var m;
          while (markpos < marked.length &&
                 ((m = marked[markpos]).from == pos || m.from == null)) {
            if (m.style != null) marks.push(m);
            ++markpos;
          }
          nextChange = markpos < marked.length ? marked[markpos].from : Infinity;
          for (var i = 0; i < marks.length; ++i) {
            var to = marks[i].to || Infinity;
            if (to == pos) marks.splice(i--, 1);
            else nextChange = Math.min(to, nextChange);
          }
        }
        var m = 0;
        while (pos < len) {
          if (nextChange == pos) advanceMarks();
          var upto = Math.min(len, nextChange);
          while (true) {
            if (text) {
              var end = pos + text.length;
              var appliedStyle = style;
              for (var j = 0; j < marks.length; ++j)
                appliedStyle = (appliedStyle ? appliedStyle + " " : "") + marks[j].style;
              span(end > upto ? text.slice(0, upto - pos) : text, appliedStyle);
              if (end >= upto) {text = text.slice(upto - pos); pos = upto; break;}
              pos = end;
            }
            text = st[i++]; style = styleToClass(st[i++]);
          }
        }
      }
      return html.join("");
    },
    cleanUp: function() {
      this.parent = null;
      if (this.marked)
        for (var i = 0, e = this.marked.length; i < e; ++i) this.marked[i].detach(this);
    }
  };
  // Utility used by replace and split above
  function copyStyles(from, to, source, dest) {
    for (var i = 0, pos = 0, state = 0; pos < to; i+=2) {
      var part = source[i], end = pos + part.length;
      if (state == 0) {
        if (end > from) dest.push(part.slice(from - pos, Math.min(part.length, to - pos)), source[i+1]);
        if (end >= from) state = 1;
      }
      else if (state == 1) {
        if (end > to) dest.push(part.slice(0, to - pos), source[i+1]);
        else dest.push(part, source[i+1]);
      }
      pos = end;
    }
  }

// Data structure that holds the sequence of lines.
  function LeafChunk(lines) {
    this.lines = lines;
    this.parent = null;
    for (var i = 0, e = lines.length, height = 0; i < e; ++i) {
      lines[i].parent = this;
      height += lines[i].height;
    }
    this.height = height;
  }
  LeafChunk.prototype = {
    chunkSize: function() { return this.lines.length; },
    remove: function(at, n, callbacks) {
      for (var i = at, e = at + n; i < e; ++i) {
        var line = this.lines[i];
        this.height -= line.height;
        line.cleanUp();
        if (line.handlers)
          for (var j = 0; j < line.handlers.length; ++j) callbacks.push(line.handlers[j]);
      }
      this.lines.splice(at, n);
    },
    collapse: function(lines) {
      lines.splice.apply(lines, [lines.length, 0].concat(this.lines));
    },
    insertHeight: function(at, lines, height) {
      this.height += height;
      // The trick below is apparently too advanced for IE, which
      // occasionally corrupts this.lines (duplicating elements) when
      // it is used.
      if (ie) this.lines = this.lines.slice(0, at).concat(lines).concat(this.lines.slice(at));
      else this.lines.splice.apply(this.lines, [at, 0].concat(lines));
      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;
      }
    }
  };

// The history object 'chunks' changes that are made close together
  // and at almost the same time into bigger undoable units.
  function History() {
    this.time = 0;
    this.done = []; this.undone = [];
    this.compound = 0;
    this.closed = false;
  }
  History.prototype = {
    addChange: function(start, added, old) {
      this.undone.length = 0;
      var time = +new Date, cur = this.done[this.done.length - 1], last = cur && cur[cur.length - 1];
      var dtime = time - this.time;

if (this.compound && cur && !this.closed) {
        cur.push({start: start, added: added, old: old});
      } else if (dtime > 400 || !last || this.closed ||
                 last.start > start + old.length || last.start + last.added < start) {
        this.done.push([{start: start, added: added, old: old}]);
        this.closed = false;
      } else {
        var startBefore = Math.max(0, last.start - start),
            endAfter = Math.max(0, (start + old.length) - (last.start + last.added));
        for (var i = startBefore; i > 0; --i) last.old.unshift(old[i - 1]);
        for (var i = endAfter; i > 0; --i) last.old.push(old[old.length - i]);
        if (startBefore) last.start = start;
        last.added += added - (old.length - startBefore - endAfter);
      }
      this.time = time;
    },
    startCompound: function() {
      if (!this.compound++) this.closed = true;
    },
    endCompound: function() {
      if (!--this.compound) this.closed = true;
    }
  };

function stopMethod() {e_stop(this);}
  // Ensure an event has a stop method.
  function addStop(event) {
    if (!event.stop) event.stop = stopMethod;
    return event;
  }

function e_target(e) {return e.target || e.srcElement;}
  function e_button(e) {
    if (e.which) return e.which;
    else if (e.button & 1) return 1;
    else if (e.button & 2) return 3;
    else if (e.button & 4) return 2;
  }

// Allow 3rd-party code to override event properties by adding an override
  // object to an event object.
  function e_prop(e, prop) {
    var overridden = e.override && e.override.hasOwnProperty(prop);
    return overridden ? e.override[prop] : e[prop];
  }

// Event handler registration. If disconnect is true, it'll return a
  // function that unregisters the handler.
  function connect(node, type, handler, disconnect) {
    if (typeof node.addEventListener == "function") {
      node.addEventListener(type, handler, false);
      if (disconnect) return function() {node.removeEventListener(type, handler, false);};
    }
    else {
      var wrapHandler = function(event) {handler(event || window.event);};
      node.attachEvent("on" + type, wrapHandler);
      if (disconnect) return function() {node.detachEvent("on" + type, wrapHandler);};
    }
  }
  CodeMirror.connect = connect;

function Delayed() {this.id = null;}
  Delayed.prototype = {set: function(ms, f) {clearTimeout(this.id); this.id = setTimeout(f, ms);}};

var Pass = CodeMirror.Pass = {toString: function(){return "CodeMirror.Pass";}};

var gecko = /gecko\/\d{7}/i.test(navigator.userAgent);
  var ie = /MSIE \d/.test(navigator.userAgent);
  var ie_lt9 = /MSIE [1-8]\b/.test(navigator.userAgent);
  var quirksMode = ie && document.documentMode == 5;
  var webkit = /WebKit\//.test(navigator.userAgent);
  var chrome = /Chrome\//.test(navigator.userAgent);
  var safari = /Apple Computer/.test(navigator.vendor);
  var khtml = /KHTML\//.test(navigator.userAgent);

// Detect drag-and-drop
  var dragAndDrop = function() {
    // There is *some* kind of drag-and-drop support in IE6-8, but I
    // couldn't get it to work yet.
    if (ie_lt9) return false;
    var div = document.createElement('div');
    return "draggable" in div || "dragDrop" in div;
  }();

// Feature-detect whether newlines in textareas are converted to \r\n
  var lineSep = function () {
    var te = document.createElement("textarea");
    te.value = "foo\nbar";
    if (te.value.indexOf("\r") > -1) return "\r\n";
    return "\n";
  }();

// For a reason I have yet to figure out, some browsers disallow
  // word wrapping between certain characters *only* if a new inline
  // element is started between them. This makes it hard to reliably
  // measure the position of things, since that requires inserting an
  // extra span. This terribly fragile set of regexps matches the
  // character combinations that suffer from this phenomenon on the
  // various browsers.
  var spanAffectsWrapping = /^$/; // Won't match any two-character string
  if (gecko) spanAffectsWrapping = /$'/;
  else if (safari) spanAffectsWrapping = /\-[^ \-?]|\?[^ !'\"\),.\-\/:;\?\]\}]/;
  else if (chrome) spanAffectsWrapping = /\-[^ \-\.?]|\?[^ \-\.?\]\}:;!'\"\),\/]|[\.!\"#&%\)*+,:;=>\]|\}~][\(\{\[<]|\$'/;

// Counts the column offset in a string, taking tabs into account.
  // Used mostly to find indentation.
  function countColumn(string, end, tabSize) {
    if (end == null) {
      end = string.search(/[^\s\u00a0]/);
      if (end == -1) end = string.length;
    }
    for (var i = 0, n = 0; i < end; ++i) {
      if (string.charAt(i) == "\t") n += tabSize - (n % tabSize);
      else ++n;
    }
    return n;
  }

function computedStyle(elt) {
    if (elt.currentStyle) return elt.currentStyle;
    return window.getComputedStyle(elt, null);
  }

// Find the position of an element by following the offsetParent chain.
  // If screen==true, it returns screen (rather than page) coordinates.
  function eltOffset(node, screen) {
    var bod = node.ownerDocument.body;
    var x = 0, y = 0, skipBody = false;
    for (var n = node; n; n = n.offsetParent) {
      var ol = n.offsetLeft, ot = n.offsetTop;
      // Firefox reports weird inverted offsets when the body has a border.
      if (n == bod) { x += Math.abs(ol); y += Math.abs(ot); }
      else { x += ol, y += ot; }
      if (screen && computedStyle(n).position == "fixed")
        skipBody = true;
    }
    var e = screen && !skipBody ? null : bod;
    for (var n = node.parentNode; n != e; n = n.parentNode)
      if (n.scrollLeft != null) { x -= n.scrollLeft; y -= n.scrollTop;}
    return {left: x, top: y};
  }
  // Use the faster and saner getBoundingClientRect method when possible.
  if (document.documentElement.getBoundingClientRect != null) eltOffset = function(node, screen) {
    // Take the parts of bounding client rect that we are interested in so we are able to edit if need be,
    // since the returned value cannot be changed externally (they are kept in sync as the element moves within the page)
    try { var box = node.getBoundingClientRect(); box = { top: box.top, left: box.left }; }
    catch(e) { box = {top: 0, left: 0}; }
    if (!screen) {
      // Get the toplevel scroll, working around browser differences.
      if (window.pageYOffset == null) {
        var t = document.documentElement || document.body.parentNode;
        if (t.scrollTop == null) t = document.body;
        box.top += t.scrollTop; box.left += t.scrollLeft;
      } else {
        box.top += window.pageYOffset; box.left += window.pageXOffset;
      }
    }
    return box;
  };

// Get a node's text content.
  function eltText(node) {
    return node.textContent || node.innerText || node.nodeValue || "";
  }
  function selectInput(node) {
    if (ios) { // Mobile Safari apparently has a bug where select() is broken.
      node.selectionStart = 0;
      node.selectionEnd = node.value.length;
    } else node.select();
  }

// Operations on {line, ch} objects.
  function posEq(a, b) {return a.line == b.line && a.ch == b.ch;}
  function posLess(a, b) {return a.line < b.line || (a.line == b.line && a.ch < b.ch);}
  function copyPos(x) {return {line: x.line, ch: x.ch};}

// Used to position the cursor after an undo/redo by finding the
  // last edited character.
  function editEnd(from, to) {
    if (!to) return 0;
    if (!from) return to.length;
    for (var i = from.length, j = to.length; i >= 0 && j >= 0; --i, --j)
      if (from.charAt(i) != to.charAt(j)) break;
    return j + 1;
  }

function indexOf(collection, elt) {
    if (collection.indexOf) return collection.indexOf(elt);
    for (var i = 0, e = collection.length; i < e; ++i)
      if (collection[i] == elt) return i;
    return -1;
  }
  function isWordChar(ch) {
    return /\w/.test(ch) || ch.toUpperCase() != ch.toLowerCase();
  }

// See if "".split is the broken IE version, if so, provide an
  // alternative way to split lines.
  var splitLines = "\n\nb".split(/\n/).length != 3 ? function(string) {
    var pos = 0, nl, result = [];
    while ((nl = string.indexOf("\n", pos)) > -1) {
      result.push(string.slice(pos, string.charAt(nl-1) == "\r" ? nl - 1 : nl));
      pos = nl + 1;
    }
    result.push(string.slice(pos));
    return result;
  } : function(string){return string.split(/\r?\n/);};
  CodeMirror.splitLines = splitLines;

CodeMirror.defineMode("null", function() {
    return {token: function(stream) {stream.skipToEnd();}};
  });
  CodeMirror.defineMIME("text/plain", "null");

var keyNames = {3: "Enter", 8: "Backspace", 9: "Tab", 13: "Enter", 16: "Shift", 17: "Ctrl", 18: "Alt",
                  19: "Pause", 20: "CapsLock", 27: "Esc", 32: "Space", 33: "PageUp", 34: "PageDown", 35: "End",
                  36: "Home", 37: "Left", 38: "Up", 39: "Right", 40: "Down", 44: "PrintScrn", 45: "Insert",
                  46: "Delete", 59: ";", 91: "Mod", 92: "Mod", 93: "Mod", 127: "Delete", 186: ";", 187: "=", 188: ",",
                  189: "-", 190: ".", 191: "/", 192: "`", 219: "[", 220: "\\", 221: "]", 222: "'", 63276: "PageUp",
                  63277: "PageDown", 63275: "End", 63273: "Home", 63234: "Left", 63232: "Up", 63235: "Right",
                  63233: "Down", 63302: "Insert", 63272: "Delete"};
  CodeMirror.keyNames = keyNames;
  (function() {
    // Number keys
    for (var i = 0; i < 10; i++) keyNames[i + 48] = String(i);
    // Alphabetic keys
    for (var i = 65; i <= 90; i++) keyNames[i] = String.fromCharCode(i);
    // Function keys
    for (var i = 1; i <= 12; i++) keyNames[i + 111] = keyNames[i + 63235] = "F" + i;
  })();

return CodeMirror;
})();