// 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;
      else if (option == "showCursorWhenSelecting") updateSelection();
      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);
    },
    defaultTextHeight: function() { return textHeight(); },
    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 == "head") start = sel.inverted;
      if (start == "anchor") start = !sel.inverted;
      if (start == "end") start = false;
      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};
    },
    scrollIntoView: function(pos) {
      var coords = localCoords(pos ? clipPos(pos) : sel.inverted ? sel.from : sel.to);
      scrollIntoView(coords.x, coords.y, coords.x, coords.yBot);
    },

    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 (Math.abs(scrollbar.scrollTop - lastScrollTop) > 1) {
      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 (Math.abs(scroller.scrollTop - lastScrollTop) > 1) {
      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(clipPos(start), cur);
        return;
      }
      startstart = clipPos(startstart);
      startend = clipPos(startend);
      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;
    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_lt9) { 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" && (ie_lt9 || document.activeElement != input))
      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 || options.showCursorWhenSelecting) {
      cursor.style.top = headPos.y + "px";
      cursor.style.left = (options.lineWrapping ? Math.min(headPos.x, lineSpace.offsetWidth) : headPos.x) + "px";
      cursor.style.display = "";
    } else {
      cursor.style.display = "none";
    }
    if (!collapsed) {
      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 - 1) + "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);
      selectionDiv.style.display = "";
    } else {
      selectionDiv.style.display = "none";
    }
  }

  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,
  showCursorWhenSelecting: false,
  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)) continue;
      if (modeObj.hasOwnProperty(prop)) modeObj["_" + prop] = modeObj[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": "goPageDown", "Shift-Ctrl-V": "goPageUp", "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);
    var form = textarea.form, realSubmit = form.submit;
    textarea.form.submit = function wrappedSubmit() {
      save();
      form.submit = realSubmit;
      form.submit();
      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/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 qtwebkit = webkit && /Qt\/\d+\.\d+/.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);

var opera_version = opera && navigator.userAgent.match(/Version\/(\d*\.\d*)/);
if (opera_version) opera_version = Number(opera_version[1]);
// Some browsers use the wrong event properties to signal cmd/ctrl on OS X
var flipCtrlCmd = mac && (qtwebkit || opera && (opera_version == null || opera_version < 12.11));

// 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; ; ++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;
}
var nonASCIISingleCaseWordChar = /[\u3040-\u309f\u30a0-\u30ff\u3400-\u4db5\u4e00-\u9fcc]/;
function isWordChar(ch) {
  return /\w/.test(ch) || ch > "\x80" &&
    (ch.toUpperCase() != ch.toLowerCase() || nonASCIISingleCaseWordChar.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 = "2.38";

return CodeMirror;

})();