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From ryanram...@apache.org
Subject [08/51] [partial] Restructure to simpler jam/erica style.
Date Sat, 11 May 2013 05:48:21 GMT
http://git-wip-us.apache.org/repos/asf/couchdb/blob/4615a788/src/fauxton/jam/codemirror/lib/codemirror.js
----------------------------------------------------------------------
diff --git a/src/fauxton/jam/codemirror/lib/codemirror.js b/src/fauxton/jam/codemirror/lib/codemirror.js
new file mode 100644
index 0000000..761e3cd
--- /dev/null
+++ b/src/fauxton/jam/codemirror/lib/codemirror.js
@@ -0,0 +1,3186 @@
+(function (root, factory) {
+    if (typeof exports === 'object') {
+        // Node. Does not work with strict CommonJS, but
+        // only CommonJS-like enviroments that support module.exports,
+        // like Node.
+        module.exports = factory(require('jquery'));
+    } else if (typeof define === 'function' && define.amd) {
+        // AMD. Register as an anonymous module.
+        define([], factory);
+    } else {
+        // Browser globals
+        root.returnExports = factory(root.jQuery);
+    }
+}(this, function () {
+
+// 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
+
+  "use strict";
+  // This is the function that produces an editor instance. Its
+  // closure is used to store the editor state.
+  var CodeMirror = function CodeMirror(place, givenOptions) {
+    // Determine effective options based on given values and defaults.
+    var options = {}, defaults = CodeMirror.defaults;
+    for (var opt in defaults)
+      if (defaults.hasOwnProperty(opt))
+        options[opt] = (givenOptions && givenOptions.hasOwnProperty(opt) ? givenOptions : defaults)[opt];
+
+    var input = elt("textarea", null, null, "position: absolute; padding: 0; width: 1px; height: 1em");
+    input.setAttribute("wrap", "off"); input.setAttribute("autocorrect", "off"); input.setAttribute("autocapitalize", "off");
+    // Wraps and hides input textarea
+    var inputDiv = elt("div", [input], null, "overflow: hidden; position: relative; width: 3px; height: 0px;");
+    // The empty scrollbar content, used solely for managing the scrollbar thumb.
+    var scrollbarInner = elt("div", null, "CodeMirror-scrollbar-inner");
+    // The vertical scrollbar. Horizontal scrolling is handled by the scroller itself.
+    var scrollbar = elt("div", [scrollbarInner], "CodeMirror-scrollbar");
+    // DIVs containing the selection and the actual code
+    var lineDiv = elt("div"), selectionDiv = elt("div", null, null, "position: relative; z-index: -1");
+    // Blinky cursor, and element used to ensure cursor fits at the end of a line
+    var cursor = elt("pre", "\u00a0", "CodeMirror-cursor"), widthForcer = elt("pre", "\u00a0", "CodeMirror-cursor", "visibility: hidden");
+    // Used to measure text size
+    var measure = elt("div", null, null, "position: absolute; width: 100%; height: 0px; overflow: hidden; visibility: hidden;");
+    var lineSpace = elt("div", [measure, cursor, widthForcer, selectionDiv, lineDiv], null, "position: relative; z-index: 0");
+    var gutterText = elt("div", null, "CodeMirror-gutter-text"), gutter = elt("div", [gutterText], "CodeMirror-gutter");
+    // Moved around its parent to cover visible view
+    var mover = elt("div", [gutter, elt("div", [lineSpace], "CodeMirror-lines")], null, "position: relative");
+    // Set to the height of the text, causes scrolling
+    var sizer = elt("div", [mover], null, "position: relative");
+    // Provides scrolling
+    var scroller = elt("div", [sizer], "CodeMirror-scroll");
+    scroller.setAttribute("tabIndex", "-1");
+    // The element in which the editor lives.
+    var wrapper = elt("div", [inputDiv, scrollbar, scroller], "CodeMirror" + (options.lineWrapping ? " CodeMirror-wrap" : ""));
+    if (place.appendChild) place.appendChild(wrapper); else place(wrapper);
+
+    themeChanged(); keyMapChanged();
+    // Needed to hide big blue blinking cursor on Mobile Safari
+    if (ios) input.style.width = "0px";
+    if (!webkit) scroller.draggable = true;
+    lineSpace.style.outline = "none";
+    if (options.tabindex != null) input.tabIndex = options.tabindex;
+    if (options.autofocus) focusInput();
+    if (!options.gutter && !options.lineNumbers) gutter.style.display = "none";
+    // Needed to handle Tab key in KHTML
+    if (khtml) inputDiv.style.height = "1px", inputDiv.style.position = "absolute";
+
+    // Check for OS X >= 10.7. This has transparent scrollbars, so the
+    // overlaying of one scrollbar with another won't work. This is a
+    // temporary hack to simply turn off the overlay scrollbar. See
+    // issue #727.
+    if (mac_geLion) { scrollbar.style.zIndex = -2; scrollbar.style.visibility = "hidden"; }
+    // Need to set a minimum width to see the scrollbar on IE7 (but must not set it on IE8).
+    else if (ie_lt8) scrollbar.style.minWidth = "18px";
+
+    // Delayed object wrap timeouts, making sure only one is active. blinker holds an interval.
+    var poll = new Delayed(), highlight = new Delayed(), blinker;
+
+    // mode holds a mode API object. doc is the tree of Line objects,
+    // frontier is the point up to which the content has been parsed,
+    // and history the undo history (instance of History constructor).
+    var mode, doc = new BranchChunk([new LeafChunk([new Line("")])]), frontier = 0, focused;
+    loadMode();
+    // The selection. These are always maintained to point at valid
+    // positions. Inverted is used to remember that the user is
+    // selecting bottom-to-top.
+    var sel = {from: {line: 0, ch: 0}, to: {line: 0, ch: 0}, inverted: false};
+    // Selection-related flags. shiftSelecting obviously tracks
+    // whether the user is holding shift.
+    var shiftSelecting, lastClick, lastDoubleClick, lastScrollTop = 0, draggingText,
+        overwrite = false, suppressEdits = false, pasteIncoming = false;
+    // Variables used by startOperation/endOperation to track what
+    // happened during the operation.
+    var updateInput, userSelChange, changes, textChanged, selectionChanged,
+        gutterDirty, callbacks;
+    // Current visible range (may be bigger than the view window).
+    var displayOffset = 0, showingFrom = 0, showingTo = 0, lastSizeC = 0;
+    // bracketHighlighted is used to remember that a bracket has been
+    // marked.
+    var bracketHighlighted;
+    // Tracks the maximum line length so that the horizontal scrollbar
+    // can be kept static when scrolling.
+    var maxLine = getLine(0), updateMaxLine = false, maxLineChanged = true;
+    var pollingFast = false; // Ensures slowPoll doesn't cancel fastPoll
+    var goalColumn = null;
+
+    // Initialize the content.
+    operation(function(){setValue(options.value || ""); updateInput = false;})();
+    var history = new History();
+
+    // Register our event handlers.
+    connect(scroller, "mousedown", operation(onMouseDown));
+    connect(scroller, "dblclick", operation(onDoubleClick));
+    connect(lineSpace, "selectstart", e_preventDefault);
+    // Gecko browsers fire contextmenu *after* opening the menu, at
+    // which point we can't mess with it anymore. Context menu is
+    // handled in onMouseDown for Gecko.
+    if (!gecko) connect(scroller, "contextmenu", onContextMenu);
+    connect(scroller, "scroll", onScrollMain);
+    connect(scrollbar, "scroll", onScrollBar);
+    connect(scrollbar, "mousedown", function() {if (focused) setTimeout(focusInput, 0);});
+    var resizeHandler = connect(window, "resize", function() {
+      if (wrapper.parentNode) updateDisplay(true);
+      else resizeHandler();
+    }, true);
+    connect(input, "keyup", operation(onKeyUp));
+    connect(input, "input", fastPoll);
+    connect(input, "keydown", operation(onKeyDown));
+    connect(input, "keypress", operation(onKeyPress));
+    connect(input, "focus", onFocus);
+    connect(input, "blur", onBlur);
+
+    function drag_(e) {
+      if (options.onDragEvent && options.onDragEvent(instance, addStop(e))) return;
+      e_stop(e);
+    }
+    if (options.dragDrop) {
+      connect(scroller, "dragstart", onDragStart);
+      connect(scroller, "dragenter", drag_);
+      connect(scroller, "dragover", drag_);
+      connect(scroller, "drop", operation(onDrop));
+    }
+    connect(scroller, "paste", function(){focusInput(); fastPoll();});
+    connect(input, "paste", function(){pasteIncoming = true; fastPoll();});
+    connect(input, "cut", operation(function(){
+      if (!options.readOnly) replaceSelection("");
+    }));
+
+    // Needed to handle Tab key in KHTML
+    if (khtml) connect(sizer, "mouseup", function() {
+        if (document.activeElement == input) input.blur();
+        focusInput();
+    });
+
+    // IE throws unspecified error in certain cases, when
+    // trying to access activeElement before onload
+    var hasFocus; try { hasFocus = (document.activeElement == input); } catch(e) { }
+    if (hasFocus || options.autofocus) setTimeout(onFocus, 20);
+    else onBlur();
+
+    function isLine(l) {return l >= 0 && l < doc.size;}
+    // The instance object that we'll return. Mostly calls out to
+    // local functions in the CodeMirror function. Some do some extra
+    // range checking and/or clipping. operation is used to wrap the
+    // call so that changes it makes are tracked, and the display is
+    // updated afterwards.
+    var instance = wrapper.CodeMirror = {
+      getValue: getValue,
+      setValue: operation(setValue),
+      getSelection: getSelection,
+      replaceSelection: operation(replaceSelection),
+      focus: function(){window.focus(); focusInput(); onFocus(); fastPoll();},
+      setOption: function(option, value) {
+        var oldVal = options[option];
+        options[option] = value;
+        if (option == "mode" || option == "indentUnit") loadMode();
+        else if (option == "readOnly" && value == "nocursor") {onBlur(); input.blur();}
+        else if (option == "readOnly" && !value) {resetInput(true);}
+        else if (option == "theme") themeChanged();
+        else if (option == "lineWrapping" && oldVal != value) operation(wrappingChanged)();
+        else if (option == "tabSize") updateDisplay(true);
+        else if (option == "keyMap") keyMapChanged();
+        else if (option == "tabindex") input.tabIndex = value;
+        if (option == "lineNumbers" || option == "gutter" || option == "firstLineNumber" ||
+            option == "theme" || option == "lineNumberFormatter") {
+          gutterChanged();
+          updateDisplay(true);
+        }
+      },
+      getOption: function(option) {return options[option];},
+      getMode: function() {return mode;},
+      undo: operation(undo),
+      redo: operation(redo),
+      indentLine: operation(function(n, dir) {
+        if (typeof dir != "string") {
+          if (dir == null) dir = options.smartIndent ? "smart" : "prev";
+          else dir = dir ? "add" : "subtract";
+        }
+        if (isLine(n)) indentLine(n, dir);
+      }),
+      indentSelection: operation(indentSelected),
+      historySize: function() {return {undo: history.done.length, redo: history.undone.length};},
+      clearHistory: function() {history = new History();},
+      setHistory: function(histData) {
+        history = new History();
+        history.done = histData.done;
+        history.undone = histData.undone;
+      },
+      getHistory: function() {
+        function cp(arr) {
+          for (var i = 0, nw = [], nwelt; i < arr.length; ++i) {
+            nw.push(nwelt = []);
+            for (var j = 0, elt = arr[i]; j < elt.length; ++j) {
+              var old = [], cur = elt[j];
+              nwelt.push({start: cur.start, added: cur.added, old: old});
+              for (var k = 0; k < cur.old.length; ++k) old.push(hlText(cur.old[k]));
+            }
+          }
+          return nw;
+        }
+        return {done: cp(history.done), undone: cp(history.undone)};
+      },
+      matchBrackets: operation(function(){matchBrackets(true);}),
+      getTokenAt: operation(function(pos) {
+        pos = clipPos(pos);
+        return getLine(pos.line).getTokenAt(mode, getStateBefore(pos.line), options.tabSize, pos.ch);
+      }),
+      getStateAfter: function(line) {
+        line = clipLine(line == null ? doc.size - 1: line);
+        return getStateBefore(line + 1);
+      },
+      cursorCoords: function(start, mode) {
+        if (start == null) start = sel.inverted;
+        return this.charCoords(start ? sel.from : sel.to, mode);
+      },
+      charCoords: function(pos, mode) {
+        pos = clipPos(pos);
+        if (mode == "local") return localCoords(pos, false);
+        if (mode == "div") return localCoords(pos, true);
+        return pageCoords(pos);
+      },
+      coordsChar: function(coords) {
+        var off = eltOffset(lineSpace);
+        return coordsChar(coords.x - off.left, coords.y - off.top);
+      },
+      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 = sel.inverted;
+        return copyPos(start ? sel.from : sel.to);
+      },
+      somethingSelected: function() {return !posEq(sel.from, sel.to);},
+      setCursor: operation(function(line, ch, user) {
+        if (ch == null && typeof line.line == "number") setCursor(line.line, line.ch, user);
+        else setCursor(line, ch, user);
+      }),
+      setSelection: operation(function(from, to, user) {
+        (user ? setSelectionUser : setSelection)(clipPos(from), clipPos(to || from));
+      }),
+      getLine: function(line) {if (isLine(line)) return getLine(line).text;},
+      getLineHandle: function(line) {if (isLine(line)) return getLine(line);},
+      setLine: operation(function(line, text) {
+        if (isLine(line)) replaceRange(text, {line: line, ch: 0}, {line: line, ch: getLine(line).text.length});
+      }),
+      removeLine: operation(function(line) {
+        if (isLine(line)) replaceRange("", {line: line, ch: 0}, clipPos({line: line+1, ch: 0}));
+      }),
+      replaceRange: operation(replaceRange),
+      getRange: function(from, to, lineSep) {return getRange(clipPos(from), clipPos(to), lineSep);},
+
+      triggerOnKeyDown: operation(onKeyDown),
+      execCommand: function(cmd) {return commands[cmd](instance);},
+      // Stuff used by commands, probably not much use to outside code.
+      moveH: operation(moveH),
+      deleteH: operation(deleteH),
+      moveV: operation(moveV),
+      toggleOverwrite: function() {
+        if(overwrite){
+          overwrite = false;
+          cursor.className = cursor.className.replace(" CodeMirror-overwrite", "");
+        } else {
+          overwrite = true;
+          cursor.className += " CodeMirror-overwrite";
+        }
+      },
+
+      posFromIndex: function(off) {
+        var lineNo = 0, ch;
+        doc.iter(0, doc.size, function(line) {
+          var sz = line.text.length + 1;
+          if (sz > off) { ch = off; return true; }
+          off -= sz;
+          ++lineNo;
+        });
+        return clipPos({line: lineNo, ch: ch});
+      },
+      indexFromPos: function (coords) {
+        if (coords.line < 0 || coords.ch < 0) return 0;
+        var index = coords.ch;
+        doc.iter(0, coords.line, function (line) {
+          index += line.text.length + 1;
+        });
+        return index;
+      },
+      scrollTo: function(x, y) {
+        if (x != null) scroller.scrollLeft = x;
+        if (y != null) scrollbar.scrollTop = scroller.scrollTop = y;
+        updateDisplay([]);
+      },
+      getScrollInfo: function() {
+        return {x: scroller.scrollLeft, y: scrollbar.scrollTop,
+                height: scrollbar.scrollHeight, width: scroller.scrollWidth};
+      },
+      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(start, cur);
+        } else if (type == "double") {
+          var word = findWordAt(cur);
+          if (posLess(cur, startstart)) setSelectionUser(word.from, startend);
+          else setSelectionUser(startstart, word.to);
+        } else if (type == "triple") {
+          if (posLess(cur, startstart)) setSelectionUser(startend, clipPos({line: cur.line, ch: 0}));
+          else setSelectionUser(startstart, clipPos({line: cur.line + 1, ch: 0}));
+        }
+      }
+
+      function extend(e) {
+        var cur = posFromMouse(e, true);
+        if (cur && !posEq(cur, last)) {
+          if (!focused) onFocus();
+          last = cur;
+          doSelect(cur);
+          updateInput = false;
+          var visible = visibleLines();
+          if (cur.line >= visible.to || cur.line < visible.from)
+            going = setTimeout(operation(function(){extend(e);}), 150);
+        }
+      }
+
+      function done(e) {
+        clearTimeout(going);
+        var cur = posFromMouse(e);
+        if (cur) doSelect(cur);
+        e_preventDefault(e);
+        focusInput();
+        updateInput = true;
+        move(); up();
+      }
+      var move = connect(document, "mousemove", operation(function(e) {
+        clearTimeout(going);
+        e_preventDefault(e);
+        if (!ie && !e_button(e)) done(e);
+        else extend(e);
+      }), true);
+      var up = connect(document, "mouseup", operation(done), true);
+    }
+    function onDoubleClick(e) {
+      for (var n = e_target(e); n != wrapper; n = n.parentNode)
+        if (n.parentNode == gutterText) return e_preventDefault(e);
+      e_preventDefault(e);
+    }
+    function onDrop(e) {
+      if (options.onDragEvent && options.onDragEvent(instance, addStop(e))) return;
+      e_preventDefault(e);
+      var pos = posFromMouse(e, true), files = e.dataTransfer.files;
+      if (!pos || options.readOnly) return;
+      if (files && files.length && window.FileReader && window.File) {
+        var n = files.length, text = Array(n), read = 0;
+        var loadFile = function(file, i) {
+          var reader = new FileReader;
+          reader.onload = function() {
+            text[i] = reader.result;
+            if (++read == n) {
+              pos = clipPos(pos);
+              operation(function() {
+                var end = replaceRange(text.join(""), pos, pos);
+                setSelectionUser(pos, end);
+              })();
+            }
+          };
+          reader.readAsText(file);
+        };
+        for (var i = 0; i < n; ++i) loadFile(files[i], i);
+      } else {
+        // Don't do a replace if the drop happened inside of the selected text.
+        if (draggingText && !(posLess(pos, sel.from) || posLess(sel.to, pos))) return;
+        try {
+          var text = e.dataTransfer.getData("Text");
+          if (text) {
+            compoundChange(function() {
+              var curFrom = sel.from, curTo = sel.to;
+              setSelectionUser(pos, pos);
+              if (draggingText) replaceRange("", curFrom, curTo);
+              replaceSelection(text);
+              focusInput();
+            });
+          }
+        }
+        catch(e){}
+      }
+    }
+    function onDragStart(e) {
+      var txt = getSelection();
+      e.dataTransfer.setData("Text", txt);
+
+      // Use dummy image instead of default browsers image.
+      if (e.dataTransfer.setDragImage)
+        e.dataTransfer.setDragImage(elt('img'), 0, 0);
+    }
+
+    function doHandleBinding(bound, dropShift) {
+      if (typeof bound == "string") {
+        bound = commands[bound];
+        if (!bound) return false;
+      }
+      var prevShift = shiftSelecting;
+      try {
+        if (options.readOnly) suppressEdits = true;
+        if (dropShift) shiftSelecting = null;
+        bound(instance);
+      } catch(e) {
+        if (e != Pass) throw e;
+        return false;
+      } finally {
+        shiftSelecting = prevShift;
+        suppressEdits = false;
+      }
+      return true;
+    }
+    var maybeTransition;
+    function handleKeyBinding(e) {
+      // Handle auto keymap transitions
+      var startMap = getKeyMap(options.keyMap), next = startMap.auto;
+      clearTimeout(maybeTransition);
+      if (next && !isModifierKey(e)) maybeTransition = setTimeout(function() {
+        if (getKeyMap(options.keyMap) == startMap) {
+          options.keyMap = (next.call ? next.call(null, instance) : next);
+        }
+      }, 50);
+
+      var name = keyNames[e_prop(e, "keyCode")], handled = false;
+      var flipCtrlCmd = opera && mac;
+      if (name == null || e.altGraphKey) return false;
+      if (e_prop(e, "altKey")) name = "Alt-" + name;
+      if (e_prop(e, flipCtrlCmd ? "metaKey" : "ctrlKey")) name = "Ctrl-" + name;
+      if (e_prop(e, flipCtrlCmd ? "ctrlKey" : "metaKey")) name = "Cmd-" + name;
+
+      var stopped = false;
+      function stop() { stopped = true; }
+
+      if (e_prop(e, "shiftKey")) {
+        handled = lookupKey("Shift-" + name, options.extraKeys, options.keyMap,
+                            function(b) {return doHandleBinding(b, true);}, stop)
+               || lookupKey(name, options.extraKeys, options.keyMap, function(b) {
+                 if (typeof b == "string" && /^go[A-Z]/.test(b)) return doHandleBinding(b);
+               }, stop);
+      } else {
+        handled = lookupKey(name, options.extraKeys, options.keyMap, doHandleBinding, stop);
+      }
+      if (stopped) handled = false;
+      if (handled) {
+        e_preventDefault(e);
+        restartBlink();
+        if (ie_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") input.focus();
+    }
+
+    function scrollCursorIntoView() {
+      var coords = calculateCursorCoords();
+      scrollIntoView(coords.x, coords.y, coords.x, coords.yBot);
+      if (!focused) return;
+      var box = sizer.getBoundingClientRect(), doScroll = null;
+      if (coords.y + box.top < 0) doScroll = true;
+      else if (coords.y + box.top + textHeight() > (window.innerHeight || document.documentElement.clientHeight)) doScroll = false;
+      if (doScroll != null) {
+        var hidden = cursor.style.display == "none";
+        if (hidden) {
+          cursor.style.display = "";
+          cursor.style.left = coords.x + "px";
+          cursor.style.top = (coords.y - displayOffset) + "px";
+        }
+        cursor.scrollIntoView(doScroll);
+        if (hidden) cursor.style.display = "none";
+      }
+    }
+    function calculateCursorCoords() {
+      var cursor = localCoords(sel.inverted ? sel.from : sel.to);
+      var x = options.lineWrapping ? Math.min(cursor.x, lineSpace.offsetWidth) : cursor.x;
+      return {x: x, y: cursor.y, yBot: cursor.yBot};
+    }
+    function scrollIntoView(x1, y1, x2, y2) {
+      var scrollPos = calculateScrollPos(x1, y1, x2, y2);
+      if (scrollPos.scrollLeft != null) {scroller.scrollLeft = scrollPos.scrollLeft;}
+      if (scrollPos.scrollTop != null) {scrollbar.scrollTop = scroller.scrollTop = scrollPos.scrollTop;}
+    }
+    function calculateScrollPos(x1, y1, x2, y2) {
+      var pl = paddingLeft(), pt = paddingTop();
+      y1 += pt; y2 += pt; x1 += pl; x2 += pl;
+      var screen = scroller.clientHeight, screentop = scrollbar.scrollTop, result = {};
+      var docBottom = needsScrollbar() || Infinity;
+      var atTop = y1 < pt + 10, atBottom = y2 + pt > docBottom - 10;
+      if (y1 < screentop) result.scrollTop = atTop ? 0 : Math.max(0, y1);
+      else if (y2 > screentop + screen) result.scrollTop = (atBottom ? docBottom : y2) - screen;
+
+      var screenw = scroller.clientWidth, screenleft = scroller.scrollLeft;
+      var gutterw = options.fixedGutter ? gutter.clientWidth : 0;
+      var atLeft = x1 < gutterw + pl + 10;
+      if (x1 < screenleft + gutterw || atLeft) {
+        if (atLeft) x1 = 0;
+        result.scrollLeft = Math.max(0, x1 - 10 - gutterw);
+      } else if (x2 > screenw + screenleft - 3) {
+        result.scrollLeft = x2 + 10 - screenw;
+      }
+      return result;
+    }
+
+    function visibleLines(scrollTop) {
+      var lh = textHeight(), top = (scrollTop != null ? scrollTop : scrollbar.scrollTop) - paddingTop();
+      var fromHeight = Math.max(0, Math.floor(top / lh));
+      var toHeight = Math.ceil((top + scroller.clientHeight) / lh);
+      return {from: lineAtHeight(doc, fromHeight),
+              to: lineAtHeight(doc, toHeight)};
+    }
+    // Uses a set of changes plus the current scroll position to
+    // determine which DOM updates have to be made, and makes the
+    // updates.
+    function updateDisplay(changes, suppressCallback, scrollTop) {
+      if (!scroller.clientWidth) {
+        showingFrom = showingTo = displayOffset = 0;
+        return;
+      }
+      // Compute the new visible window
+      // If scrollTop is specified, use that to determine which lines
+      // to render instead of the current scrollbar position.
+      var visible = visibleLines(scrollTop);
+      // Bail out if the visible area is already rendered and nothing changed.
+      if (changes !== true && changes.length == 0 && visible.from > showingFrom && visible.to < showingTo) {
+        updateVerticalScroll(scrollTop);
+        return;
+      }
+      var from = Math.max(visible.from - 100, 0), to = Math.min(doc.size, visible.to + 100);
+      if (showingFrom < from && from - showingFrom < 20) from = showingFrom;
+      if (showingTo > to && showingTo - to < 20) to = Math.min(doc.size, showingTo);
+
+      // Create a range of theoretically intact lines, and punch holes
+      // in that using the change info.
+      var intact = changes === true ? [] :
+        computeIntact([{from: showingFrom, to: showingTo, domStart: 0}], changes);
+      // Clip off the parts that won't be visible
+      var intactLines = 0;
+      for (var i = 0; i < intact.length; ++i) {
+        var range = intact[i];
+        if (range.from < from) {range.domStart += (from - range.from); range.from = from;}
+        if (range.to > to) range.to = to;
+        if (range.from >= range.to) intact.splice(i--, 1);
+        else intactLines += range.to - range.from;
+      }
+      if (intactLines == to - from && from == showingFrom && to == showingTo) {
+        updateVerticalScroll(scrollTop);
+        return;
+      }
+      intact.sort(function(a, b) {return a.domStart - b.domStart;});
+
+      var th = textHeight(), gutterDisplay = gutter.style.display;
+      lineDiv.style.display = "none";
+      patchDisplay(from, to, intact);
+      lineDiv.style.display = gutter.style.display = "";
+
+      var different = from != showingFrom || to != showingTo || lastSizeC != scroller.clientHeight + th;
+      // This is just a bogus formula that detects when the editor is
+      // resized or the font size changes.
+      if (different) lastSizeC = scroller.clientHeight + th;
+      if (from != showingFrom || to != showingTo && options.onViewportChange)
+        setTimeout(function(){
+          if (options.onViewportChange) options.onViewportChange(instance, from, to);
+        });
+      showingFrom = from; showingTo = to;
+      displayOffset = heightAtLine(doc, from);
+      startWorker(100);
+
+      // Since this is all rather error prone, it is honoured with the
+      // only assertion in the whole file.
+      if (lineDiv.childNodes.length != showingTo - showingFrom)
+        throw new Error("BAD PATCH! " + JSON.stringify(intact) + " size=" + (showingTo - showingFrom) +
+                        " nodes=" + lineDiv.childNodes.length);
+
+      function checkHeights() {
+        var curNode = lineDiv.firstChild, heightChanged = false;
+        doc.iter(showingFrom, showingTo, function(line) {
+          // Work around bizarro IE7 bug where, sometimes, our curNode
+          // is magically replaced with a new node in the DOM, leaving
+          // us with a reference to an orphan (nextSibling-less) node.
+          if (!curNode) return;
+          if (!line.hidden) {
+            var height = Math.round(curNode.offsetHeight / th) || 1;
+            if (line.height != height) {
+              updateLineHeight(line, height);
+              gutterDirty = heightChanged = true;
+            }
+          }
+          curNode = curNode.nextSibling;
+        });
+        return heightChanged;
+      }
+
+      if (options.lineWrapping) checkHeights();
+
+      gutter.style.display = gutterDisplay;
+      if (different || gutterDirty) {
+        // If the gutter grew in size, re-check heights. If those changed, re-draw gutter.
+        updateGutter() && options.lineWrapping && checkHeights() && updateGutter();
+      }
+      updateVerticalScroll(scrollTop);
+      updateSelection();
+      if (!suppressCallback && options.onUpdate) options.onUpdate(instance);
+      return true;
+    }
+
+    function computeIntact(intact, changes) {
+      for (var i = 0, l = changes.length || 0; i < l; ++i) {
+        var change = changes[i], intact2 = [], diff = change.diff || 0;
+        for (var j = 0, l2 = intact.length; j < l2; ++j) {
+          var range = intact[j];
+          if (change.to <= range.from && change.diff)
+            intact2.push({from: range.from + diff, to: range.to + diff,
+                          domStart: range.domStart});
+          else if (change.to <= range.from || change.from >= range.to)
+            intact2.push(range);
+          else {
+            if (change.from > range.from)
+              intact2.push({from: range.from, to: change.from, domStart: range.domStart});
+            if (change.to < range.to)
+              intact2.push({from: change.to + diff, to: range.to + diff,
+                            domStart: range.domStart + (change.to - range.from)});
+          }
+        }
+        intact = intact2;
+      }
+      return intact;
+    }
+
+    function patchDisplay(from, to, intact) {
+      function killNode(node) {
+        var tmp = node.nextSibling;
+        node.parentNode.removeChild(node);
+        return tmp;
+      }
+      // The first pass removes the DOM nodes that aren't intact.
+      if (!intact.length) removeChildren(lineDiv);
+      else {
+        var domPos = 0, curNode = lineDiv.firstChild, n;
+        for (var i = 0; i < intact.length; ++i) {
+          var cur = intact[i];
+          while (cur.domStart > domPos) {curNode = killNode(curNode); domPos++;}
+          for (var j = 0, e = cur.to - cur.from; j < e; ++j) {curNode = curNode.nextSibling; domPos++;}
+        }
+        while (curNode) curNode = killNode(curNode);
+      }
+      // This pass fills in the lines that actually changed.
+      var nextIntact = intact.shift(), curNode = lineDiv.firstChild, j = from;
+      doc.iter(from, to, function(line) {
+        if (nextIntact && nextIntact.to == j) nextIntact = intact.shift();
+        if (!nextIntact || nextIntact.from > j) {
+          if (line.hidden) var lineElement = elt("pre");
+          else {
+            var lineElement = lineContent(line);
+            if (line.className) lineElement.className = line.className;
+            // Kludge to make sure the styled element lies behind the selection (by z-index)
+            if (line.bgClassName) {
+              var pre = elt("pre", "\u00a0", line.bgClassName, "position: absolute; left: 0; right: 0; top: 0; bottom: 0; z-index: -2");
+              lineElement = elt("div", [pre, lineElement], null, "position: relative");
+            }
+          }
+          lineDiv.insertBefore(lineElement, curNode);
+        } else {
+          curNode = curNode.nextSibling;
+        }
+        ++j;
+      });
+    }
+
+    function updateGutter() {
+      if (!options.gutter && !options.lineNumbers) return;
+      var hText = mover.offsetHeight, hEditor = scroller.clientHeight;
+      gutter.style.height = (hText - hEditor < 2 ? hEditor : hText) + "px";
+      var fragment = document.createDocumentFragment(), i = showingFrom, normalNode;
+      doc.iter(showingFrom, Math.max(showingTo, showingFrom + 1), function(line) {
+        if (line.hidden) {
+          fragment.appendChild(elt("pre"));
+        } else {
+          var marker = line.gutterMarker;
+          var text = options.lineNumbers ? options.lineNumberFormatter(i + options.firstLineNumber) : null;
+          if (marker && marker.text)
+            text = marker.text.replace("%N%", text != null ? text : "");
+          else if (text == null)
+            text = "\u00a0";
+          var markerElement = fragment.appendChild(elt("pre", null, marker && marker.style));
+          markerElement.innerHTML = text;
+          for (var j = 1; j < line.height; ++j) {
+            markerElement.appendChild(elt("br"));
+            markerElement.appendChild(document.createTextNode("\u00a0"));
+          }
+          if (!marker) normalNode = i;
+        }
+        ++i;
+      });
+      gutter.style.display = "none";
+      removeChildrenAndAdd(gutterText, fragment);
+      // Make sure scrolling doesn't cause number gutter size to pop
+      if (normalNode != null && options.lineNumbers) {
+        var node = gutterText.childNodes[normalNode - showingFrom];
+        var minwidth = String(doc.size).length, val = eltText(node.firstChild), pad = "";
+        while (val.length + pad.length < minwidth) pad += "\u00a0";
+        if (pad) node.insertBefore(document.createTextNode(pad), node.firstChild);
+      }
+      gutter.style.display = "";
+      var resized = Math.abs((parseInt(lineSpace.style.marginLeft) || 0) - gutter.offsetWidth) > 2;
+      lineSpace.style.marginLeft = gutter.offsetWidth + "px";
+      gutterDirty = false;
+      return resized;
+    }
+    function updateSelection() {
+      var collapsed = posEq(sel.from, sel.to);
+      var fromPos = localCoords(sel.from, true);
+      var toPos = collapsed ? fromPos : localCoords(sel.to, true);
+      var headPos = sel.inverted ? fromPos : toPos, th = textHeight();
+      var wrapOff = eltOffset(wrapper), lineOff = eltOffset(lineDiv);
+      inputDiv.style.top = Math.max(0, Math.min(scroller.offsetHeight, headPos.y + lineOff.top - wrapOff.top)) + "px";
+      inputDiv.style.left = Math.max(0, Math.min(scroller.offsetWidth, headPos.x + lineOff.left - wrapOff.left)) + "px";
+      if (collapsed) {
+        cursor.style.top = headPos.y + "px";
+        cursor.style.left = (options.lineWrapping ? Math.min(headPos.x, lineSpace.offsetWidth) : headPos.x) + "px";
+        cursor.style.display = "";
+        selectionDiv.style.display = "none";
+      } else {
+        var sameLine = fromPos.y == toPos.y, fragment = document.createDocumentFragment();
+        var clientWidth = lineSpace.clientWidth || lineSpace.offsetWidth;
+        var clientHeight = lineSpace.clientHeight || lineSpace.offsetHeight;
+        var add = function(left, top, right, height) {
+          var rstyle = quirksMode ? "width: " + (!right ? clientWidth : clientWidth - right - left) + "px"
+                                  : "right: " + right + "px";
+          fragment.appendChild(elt("div", null, "CodeMirror-selected", "position: absolute; left: " + left +
+                                   "px; top: " + top + "px; " + rstyle + "; height: " + height + "px"));
+        };
+        if (sel.from.ch && fromPos.y >= 0) {
+          var right = sameLine ? clientWidth - toPos.x : 0;
+          add(fromPos.x, fromPos.y, right, th);
+        }
+        var middleStart = Math.max(0, fromPos.y + (sel.from.ch ? th : 0));
+        var middleHeight = Math.min(toPos.y, clientHeight) - middleStart;
+        if (middleHeight > 0.2 * th)
+          add(0, middleStart, 0, middleHeight);
+        if ((!sameLine || !sel.from.ch) && toPos.y < clientHeight - .5 * th)
+          add(0, toPos.y, clientWidth - toPos.x, th);
+        removeChildrenAndAdd(selectionDiv, fragment);
+        cursor.style.display = "none";
+        selectionDiv.style.display = "";
+      }
+    }
+
+    function setShift(val) {
+      if (val) shiftSelecting = shiftSelecting || (sel.inverted ? sel.to : sel.from);
+      else shiftSelecting = null;
+    }
+    function setSelectionUser(from, to) {
+      var sh = shiftSelecting && clipPos(shiftSelecting);
+      if (sh) {
+        if (posLess(sh, from)) from = sh;
+        else if (posLess(to, sh)) to = sh;
+      }
+      setSelection(from, to);
+      userSelChange = true;
+    }
+    // Update the selection. Last two args are only used by
+    // updateLines, since they have to be expressed in the line
+    // numbers before the update.
+    function setSelection(from, to, oldFrom, oldTo) {
+      goalColumn = null;
+      if (oldFrom == null) {oldFrom = sel.from.line; oldTo = sel.to.line;}
+      if (posEq(sel.from, from) && posEq(sel.to, to)) return;
+      if (posLess(to, from)) {var tmp = to; to = from; from = tmp;}
+
+      // Skip over hidden lines.
+      if (from.line != oldFrom) {
+        var from1 = skipHidden(from, oldFrom, sel.from.ch);
+        // If there is no non-hidden line left, force visibility on current line
+        if (!from1) setLineHidden(from.line, false);
+        else from = from1;
+      }
+      if (to.line != oldTo) to = skipHidden(to, oldTo, sel.to.ch);
+
+      if (posEq(from, to)) sel.inverted = false;
+      else if (posEq(from, sel.to)) sel.inverted = false;
+      else if (posEq(to, sel.from)) sel.inverted = true;
+
+      if (options.autoClearEmptyLines && posEq(sel.from, sel.to)) {
+        var head = sel.inverted ? from : to;
+        if (head.line != sel.from.line && sel.from.line < doc.size) {
+          var oldLine = getLine(sel.from.line);
+          if (/^\s+$/.test(oldLine.text))
+            setTimeout(operation(function() {
+              if (oldLine.parent && /^\s+$/.test(oldLine.text)) {
+                var no = lineNo(oldLine);
+                replaceRange("", {line: no, ch: 0}, {line: no, ch: oldLine.text.length});
+              }
+            }, 10));
+        }
+      }
+
+      sel.from = from; sel.to = to;
+      selectionChanged = true;
+    }
+    function skipHidden(pos, oldLine, oldCh) {
+      function getNonHidden(dir) {
+        var lNo = pos.line + dir, end = dir == 1 ? doc.size : -1;
+        while (lNo != end) {
+          var line = getLine(lNo);
+          if (!line.hidden) {
+            var ch = pos.ch;
+            if (toEnd || ch > oldCh || ch > line.text.length) ch = line.text.length;
+            return {line: lNo, ch: ch};
+          }
+          lNo += dir;
+        }
+      }
+      var line = getLine(pos.line);
+      var toEnd = pos.ch == line.text.length && pos.ch != oldCh;
+      if (!line.hidden) return pos;
+      if (pos.line >= oldLine) return getNonHidden(1) || getNonHidden(-1);
+      else return getNonHidden(-1) || getNonHidden(1);
+    }
+    function setCursor(line, ch, user) {
+      var pos = clipPos({line: line, ch: ch || 0});
+      (user ? setSelectionUser : setSelection)(pos, pos);
+    }
+
+    function clipLine(n) {return Math.max(0, Math.min(n, doc.size-1));}
+    function clipPos(pos) {
+      if (pos.line < 0) return {line: 0, ch: 0};
+      if (pos.line >= doc.size) return {line: doc.size-1, ch: getLine(doc.size-1).text.length};
+      var ch = pos.ch, linelen = getLine(pos.line).text.length;
+      if (ch == null || ch > linelen) return {line: pos.line, ch: linelen};
+      else if (ch < 0) return {line: pos.line, ch: 0};
+      else return pos;
+    }
+
+    function findPosH(dir, unit) {
+      var end = sel.inverted ? sel.from : sel.to, line = end.line, ch = end.ch;
+      var lineObj = getLine(line);
+      function findNextLine() {
+        for (var l = line + dir, e = dir < 0 ? -1 : doc.size; l != e; l += dir) {
+          var lo = getLine(l);
+          if (!lo.hidden) { line = l; lineObj = lo; return true; }
+        }
+      }
+      function moveOnce(boundToLine) {
+        if (ch == (dir < 0 ? 0 : lineObj.text.length)) {
+          if (!boundToLine && findNextLine()) ch = dir < 0 ? lineObj.text.length : 0;
+          else return false;
+        } else ch += dir;
+        return true;
+      }
+      if (unit == "char") moveOnce();
+      else if (unit == "column") moveOnce(true);
+      else if (unit == "word") {
+        var sawWord = false;
+        for (;;) {
+          if (dir < 0) if (!moveOnce()) break;
+          if (isWordChar(lineObj.text.charAt(ch))) sawWord = true;
+          else if (sawWord) {if (dir < 0) {dir = 1; moveOnce();} break;}
+          if (dir > 0) if (!moveOnce()) break;
+        }
+      }
+      return {line: line, ch: ch};
+    }
+    function moveH(dir, unit) {
+      var pos = dir < 0 ? sel.from : sel.to;
+      if (shiftSelecting || posEq(sel.from, sel.to)) pos = findPosH(dir, unit);
+      setCursor(pos.line, pos.ch, true);
+    }
+    function deleteH(dir, unit) {
+      if (!posEq(sel.from, sel.to)) replaceRange("", sel.from, sel.to);
+      else if (dir < 0) replaceRange("", findPosH(dir, unit), sel.to);
+      else replaceRange("", sel.from, findPosH(dir, unit));
+      userSelChange = true;
+    }
+    function moveV(dir, unit) {
+      var dist = 0, pos = localCoords(sel.inverted ? sel.from : sel.to, true);
+      if (goalColumn != null) pos.x = goalColumn;
+      if (unit == "page") {
+        var screen = Math.min(scroller.clientHeight, window.innerHeight || document.documentElement.clientHeight);
+        var target = coordsChar(pos.x, pos.y + screen * dir);
+      } else if (unit == "line") {
+        var th = textHeight();
+        var target = coordsChar(pos.x, pos.y + .5 * th + dir * th);
+      }
+      if (unit == "page") scrollbar.scrollTop += localCoords(target, true).y - pos.y;
+      setCursor(target.line, target.ch, true);
+      goalColumn = pos.x;
+    }
+
+    function findWordAt(pos) {
+      var line = getLine(pos.line).text;
+      var start = pos.ch, end = pos.ch;
+      if (line) {
+        if (pos.after === false || end == line.length) --start; else ++end;
+        var startChar = line.charAt(start);
+        var check = isWordChar(startChar) ? isWordChar :
+                    /\s/.test(startChar) ? function(ch) {return /\s/.test(ch);} :
+                    function(ch) {return !/\s/.test(ch) && isWordChar(ch);};
+        while (start > 0 && check(line.charAt(start - 1))) --start;
+        while (end < line.length && check(line.charAt(end))) ++end;
+      }
+      return {from: {line: pos.line, ch: start}, to: {line: pos.line, ch: end}};
+    }
+    function selectLine(line) {
+      setSelectionUser({line: line, ch: 0}, clipPos({line: line + 1, ch: 0}));
+    }
+    function indentSelected(mode) {
+      if (posEq(sel.from, sel.to)) return indentLine(sel.from.line, mode);
+      var e = sel.to.line - (sel.to.ch ? 0 : 1);
+      for (var i = sel.from.line; i <= e; ++i) indentLine(i, mode);
+    }
+
+    function indentLine(n, how) {
+      if (!how) how = "add";
+      if (how == "smart") {
+        if (!mode.indent) how = "prev";
+        else var state = getStateBefore(n);
+      }
+
+      var line = getLine(n), curSpace = line.indentation(options.tabSize),
+          curSpaceString = line.text.match(/^\s*/)[0], indentation;
+      if (how == "smart") {
+        indentation = mode.indent(state, line.text.slice(curSpaceString.length), line.text);
+        if (indentation == Pass) how = "prev";
+      }
+      if (how == "prev") {
+        if (n) indentation = getLine(n-1).indentation(options.tabSize);
+        else indentation = 0;
+      }
+      else if (how == "add") indentation = curSpace + options.indentUnit;
+      else if (how == "subtract") indentation = curSpace - options.indentUnit;
+      indentation = Math.max(0, indentation);
+      var diff = indentation - curSpace;
+
+      var indentString = "", pos = 0;
+      if (options.indentWithTabs)
+        for (var i = Math.floor(indentation / options.tabSize); i; --i) {pos += options.tabSize; indentString += "\t";}
+      if (pos < indentation) indentString += spaceStr(indentation - pos);
+
+      if (indentString != curSpaceString)
+        replaceRange(indentString, {line: n, ch: 0}, {line: n, ch: curSpaceString.length});
+      line.stateAfter = null;
+    }
+
+    function loadMode() {
+      mode = CodeMirror.getMode(options, options.mode);
+      doc.iter(0, doc.size, function(line) { line.stateAfter = null; });
+      frontier = 0;
+      startWorker(100);
+    }
+    function gutterChanged() {
+      var visible = options.gutter || options.lineNumbers;
+      gutter.style.display = visible ? "" : "none";
+      if (visible) gutterDirty = true;
+      else lineDiv.parentNode.style.marginLeft = 0;
+    }
+    function wrappingChanged(from, to) {
+      if (options.lineWrapping) {
+        wrapper.className += " CodeMirror-wrap";
+        var perLine = scroller.clientWidth / charWidth() - 3;
+        doc.iter(0, doc.size, function(line) {
+          if (line.hidden) return;
+          var guess = Math.ceil(line.text.length / perLine) || 1;
+          if (guess != 1) updateLineHeight(line, guess);
+        });
+        lineSpace.style.minWidth = widthForcer.style.left = "";
+      } else {
+        wrapper.className = wrapper.className.replace(" CodeMirror-wrap", "");
+        computeMaxLength();
+        doc.iter(0, doc.size, function(line) {
+          if (line.height != 1 && !line.hidden) updateLineHeight(line, 1);
+        });
+      }
+      changes.push({from: 0, to: doc.size});
+    }
+    function themeChanged() {
+      scroller.className = scroller.className.replace(/\s*cm-s-\S+/g, "") +
+        options.theme.replace(/(^|\s)\s*/g, " cm-s-");
+    }
+    function keyMapChanged() {
+      var style = keyMap[options.keyMap].style;
+      wrapper.className = wrapper.className.replace(/\s*cm-keymap-\S+/g, "") +
+        (style ? " cm-keymap-" + style : "");
+    }
+
+    function TextMarker(type, style) { this.lines = []; this.type = type; if (style) this.style = style; }
+    TextMarker.prototype.clear = operation(function() {
+      var min, max;
+      for (var i = 0; i < this.lines.length; ++i) {
+        var line = this.lines[i];
+        var span = getMarkedSpanFor(line.markedSpans, this);
+        if (span.from != null) min = lineNo(line);
+        if (span.to != null) max = lineNo(line);
+        line.markedSpans = removeMarkedSpan(line.markedSpans, span);
+      }
+      if (min != null) changes.push({from: min, to: max + 1});
+      this.lines.length = 0;
+      this.explicitlyCleared = true;
+    });
+    TextMarker.prototype.find = function() {
+      var from, to;
+      for (var i = 0; i < this.lines.length; ++i) {
+        var line = this.lines[i];
+        var span = getMarkedSpanFor(line.markedSpans, this);
+        if (span.from != null || span.to != null) {
+          var found = lineNo(line);
+          if (span.from != null) from = {line: found, ch: span.from};
+          if (span.to != null) to = {line: found, ch: span.to};
+        }
+      }
+      if (this.type == "bookmark") return from;
+      return from && {from: from, to: to};
+    };
+
+    function markText(from, to, className, options) {
+      from = clipPos(from); to = clipPos(to);
+      var marker = new TextMarker("range", className);
+      if (options) for (var opt in options) if (options.hasOwnProperty(opt))
+        marker[opt] = options[opt];
+      var curLine = from.line;
+      doc.iter(curLine, to.line + 1, function(line) {
+        var span = {from: curLine == from.line ? from.ch : null,
+                    to: curLine == to.line ? to.ch : null,
+                    marker: marker};
+        line.markedSpans = (line.markedSpans || []).concat([span]);
+        marker.lines.push(line);
+        ++curLine;
+      });
+      changes.push({from: from.line, to: to.line + 1});
+      return marker;
+    }
+
+    function setBookmark(pos) {
+      pos = clipPos(pos);
+      var marker = new TextMarker("bookmark"), line = getLine(pos.line);
+      history.addChange(pos.line, 1, [newHL(line.text, line.markedSpans)], true);
+      var span = {from: pos.ch, to: pos.ch, marker: marker};
+      line.markedSpans = (line.markedSpans || []).concat([span]);
+      marker.lines.push(line);
+      return marker;
+    }
+
+    function findMarksAt(pos) {
+      pos = clipPos(pos);
+      var markers = [], spans = getLine(pos.line).markedSpans;
+      if (spans) for (var i = 0; i < spans.length; ++i) {
+        var span = spans[i];
+        if ((span.from == null || span.from <= pos.ch) &&
+            (span.to == null || span.to >= pos.ch))
+          markers.push(span.marker);
+      }
+      return markers;
+    }
+
+    function addGutterMarker(line, text, className) {
+      if (typeof line == "number") line = getLine(clipLine(line));
+      line.gutterMarker = {text: text, style: className};
+      gutterDirty = true;
+      return line;
+    }
+    function removeGutterMarker(line) {
+      if (typeof line == "number") line = getLine(clipLine(line));
+      line.gutterMarker = null;
+      gutterDirty = true;
+    }
+
+    function changeLine(handle, op) {
+      var no = handle, line = handle;
+      if (typeof handle == "number") line = getLine(clipLine(handle));
+      else no = lineNo(handle);
+      if (no == null) return null;
+      if (op(line, no)) changes.push({from: no, to: no + 1});
+      else return null;
+      return line;
+    }
+    function setLineClass(handle, className, bgClassName) {
+      return changeLine(handle, function(line) {
+        if (line.className != className || line.bgClassName != bgClassName) {
+          line.className = className;
+          line.bgClassName = bgClassName;
+          return true;
+        }
+      });
+    }
+    function setLineHidden(handle, hidden) {
+      return changeLine(handle, function(line, no) {
+        if (line.hidden != hidden) {
+          line.hidden = hidden;
+          if (!options.lineWrapping) {
+            if (hidden && line.text.length == maxLine.text.length) {
+              updateMaxLine = true;
+            } else if (!hidden && line.text.length > maxLine.text.length) {
+              maxLine = line; updateMaxLine = false;
+            }
+          }
+          updateLineHeight(line, hidden ? 0 : 1);
+          var fline = sel.from.line, tline = sel.to.line;
+          if (hidden && (fline == no || tline == no)) {
+            var from = fline == no ? skipHidden({line: fline, ch: 0}, fline, 0) : sel.from;
+            var to = tline == no ? skipHidden({line: tline, ch: 0}, tline, 0) : sel.to;
+            // Can't hide the last visible line, we'd have no place to put the cursor
+            if (!to) return;
+            setSelection(from, to);
+          }
+          return (gutterDirty = true);
+        }
+      });
+    }
+
+    function lineInfo(line) {
+      if (typeof line == "number") {
+        if (!isLine(line)) return null;
+        var n = line;
+        line = getLine(line);
+        if (!line) return null;
+      } else {
+        var n = lineNo(line);
+        if (n == null) return null;
+      }
+      var marker = line.gutterMarker;
+      return {line: n, handle: line, text: line.text, markerText: marker && marker.text,
+              markerClass: marker && marker.style, lineClass: line.className, bgClass: line.bgClassName};
+    }
+
+    function measureLine(line, ch) {
+      if (ch == 0) return {top: 0, left: 0};
+      var pre = lineContent(line, ch);
+      removeChildrenAndAdd(measure, pre);
+      var anchor = pre.anchor;
+      var top = anchor.offsetTop, left = anchor.offsetLeft;
+      // Older IEs report zero offsets for spans directly after a wrap
+      if (ie && top == 0 && left == 0) {
+        var backup = elt("span", "x");
+        anchor.parentNode.insertBefore(backup, anchor.nextSibling);
+        top = backup.offsetTop;
+      }
+      return {top: top, left: left};
+    }
+    function localCoords(pos, inLineWrap) {
+      var x, lh = textHeight(), y = lh * (heightAtLine(doc, pos.line) - (inLineWrap ? displayOffset : 0));
+      if (pos.ch == 0) x = 0;
+      else {
+        var sp = measureLine(getLine(pos.line), pos.ch);
+        x = sp.left;
+        if (options.lineWrapping) y += Math.max(0, sp.top);
+      }
+      return {x: x, y: y, yBot: y + lh};
+    }
+    // Coords must be lineSpace-local
+    function coordsChar(x, y) {
+      var th = textHeight(), cw = charWidth(), heightPos = displayOffset + Math.floor(y / th);
+      if (heightPos < 0) return {line: 0, ch: 0};
+      var lineNo = lineAtHeight(doc, heightPos);
+      if (lineNo >= doc.size) return {line: doc.size - 1, ch: getLine(doc.size - 1).text.length};
+      var lineObj = getLine(lineNo), text = lineObj.text;
+      var tw = options.lineWrapping, innerOff = tw ? heightPos - heightAtLine(doc, lineNo) : 0;
+      if (x <= 0 && innerOff == 0) return {line: lineNo, ch: 0};
+      var wrongLine = false;
+      function getX(len) {
+        var sp = measureLine(lineObj, len);
+        if (tw) {
+          var off = Math.round(sp.top / th);
+          wrongLine = off != innerOff;
+          return Math.max(0, sp.left + (off - innerOff) * scroller.clientWidth);
+        }
+        return sp.left;
+      }
+      var from = 0, fromX = 0, to = text.length, toX;
+      // Guess a suitable upper bound for our search.
+      var estimated = Math.min(to, Math.ceil((x + innerOff * scroller.clientWidth * .9) / cw));
+      for (;;) {
+        var estX = getX(estimated);
+        if (estX <= x && estimated < to) estimated = Math.min(to, Math.ceil(estimated * 1.2));
+        else {toX = estX; to = estimated; break;}
+      }
+      if (x > toX) return {line: lineNo, ch: to};
+      // Try to guess a suitable lower bound as well.
+      estimated = Math.floor(to * 0.8); estX = getX(estimated);
+      if (estX < x) {from = estimated; fromX = estX;}
+      // Do a binary search between these bounds.
+      for (;;) {
+        if (to - from <= 1) {
+          var after = x - fromX < toX - x;
+          return {line: lineNo, ch: after ? from : to, after: after};
+        }
+        var middle = Math.ceil((from + to) / 2), middleX = getX(middle);
+        if (middleX > x) {to = middle; toX = middleX; if (wrongLine) toX += 1000; }
+        else {from = middle; fromX = middleX;}
+      }
+    }
+    function pageCoords(pos) {
+      var local = localCoords(pos, true), off = eltOffset(lineSpace);
+      return {x: off.left + local.x, y: off.top + local.y, yBot: off.top + local.yBot};
+    }
+
+    var cachedHeight, cachedHeightFor, measurePre;
+    function textHeight() {
+      if (measurePre == null) {
+        measurePre = elt("pre");
+        for (var i = 0; i < 49; ++i) {
+          measurePre.appendChild(document.createTextNode("x"));
+          measurePre.appendChild(elt("br"));
+        }
+        measurePre.appendChild(document.createTextNode("x"));
+      }
+      var offsetHeight = lineDiv.clientHeight;
+      if (offsetHeight == cachedHeightFor) return cachedHeight;
+      cachedHeightFor = offsetHeight;
+      removeChildrenAndAdd(measure, measurePre.cloneNode(true));
+      cachedHeight = measure.firstChild.offsetHeight / 50 || 1;
+      removeChildren(measure);
+      return cachedHeight;
+    }
+    var cachedWidth, cachedWidthFor = 0;
+    function charWidth() {
+      if (scroller.clientWidth == cachedWidthFor) return cachedWidth;
+      cachedWidthFor = scroller.clientWidth;
+      var anchor = elt("span", "x");
+      var pre = elt("pre", [anchor]);
+      removeChildrenAndAdd(measure, pre);
+      return (cachedWidth = anchor.offsetWidth || 10);
+    }
+    function paddingTop() {return lineSpace.offsetTop;}
+    function paddingLeft() {return lineSpace.offsetLeft;}
+
+    function posFromMouse(e, liberal) {
+      var offW = eltOffset(scroller, true), x, y;
+      // Fails unpredictably on IE[67] when mouse is dragged around quickly.
+      try { x = e.clientX; y = e.clientY; } catch (e) { return null; }
+      // This is a mess of a heuristic to try and determine whether a
+      // scroll-bar was clicked or not, and to return null if one was
+      // (and !liberal).
+      if (!liberal && (x - offW.left > scroller.clientWidth || y - offW.top > scroller.clientHeight))
+        return null;
+      var offL = eltOffset(lineSpace, true);
+      return coordsChar(x - offL.left, y - offL.top);
+    }
+    var detectingSelectAll;
+    function onContextMenu(e) {
+      var pos = posFromMouse(e), scrollPos = scrollbar.scrollTop;
+      if (!pos || opera) return; // Opera is difficult.
+      if (posEq(sel.from, sel.to) || posLess(pos, sel.from) || !posLess(pos, sel.to))
+        operation(setCursor)(pos.line, pos.ch);
+
+      var oldCSS = input.style.cssText;
+      inputDiv.style.position = "absolute";
+      input.style.cssText = "position: fixed; width: 30px; height: 30px; top: " + (e.clientY - 5) +
+        "px; left: " + (e.clientX - 5) + "px; z-index: 1000; background: white; " +
+        "border-width: 0; outline: none; overflow: hidden; opacity: .05; filter: alpha(opacity=5);";
+      focusInput();
+      resetInput(true);
+      // Adds "Select all" to context menu in FF
+      if (posEq(sel.from, sel.to)) input.value = prevInput = " ";
+
+      function rehide() {
+        inputDiv.style.position = "relative";
+        input.style.cssText = oldCSS;
+        if (ie_lt9) scrollbar.scrollTop = scrollPos;
+        slowPoll();
+
+        // Try to detect the user choosing select-all 
+        if (input.selectionStart != null) {
+          clearTimeout(detectingSelectAll);
+          var extval = input.value = " " + (posEq(sel.from, sel.to) ? "" : input.value), i = 0;
+          prevInput = " ";
+          input.selectionStart = 1; input.selectionEnd = extval.length;
+          detectingSelectAll = setTimeout(function poll(){
+            if (prevInput == " " && input.selectionStart == 0)
+              operation(commands.selectAll)(instance);
+            else if (i++ < 10) detectingSelectAll = setTimeout(poll, 500);
+            else resetInput();
+          }, 200);
+        }
+      }
+
+      if (gecko) {
+        e_stop(e);
+        var mouseup = connect(window, "mouseup", function() {
+          mouseup();
+          setTimeout(rehide, 20);
+        }, true);
+      } else {
+        setTimeout(rehide, 50);
+      }
+    }
+
+    // Cursor-blinking
+    function restartBlink() {
+      clearInterval(blinker);
+      var on = true;
+      cursor.style.visibility = "";
+      blinker = setInterval(function() {
+        cursor.style.visibility = (on = !on) ? "" : "hidden";
+      }, options.cursorBlinkRate);
+    }
+
+    var matching = {"(": ")>", ")": "(<", "[": "]>", "]": "[<", "{": "}>", "}": "{<"};
+    function matchBrackets(autoclear) {
+      var head = sel.inverted ? sel.from : sel.to, line = getLine(head.line), pos = head.ch - 1;
+      var match = (pos >= 0 && matching[line.text.charAt(pos)]) || matching[line.text.charAt(++pos)];
+      if (!match) return;
+      var ch = match.charAt(0), forward = match.charAt(1) == ">", d = forward ? 1 : -1, st = line.styles;
+      for (var off = pos + 1, i = 0, e = st.length; i < e; i+=2)
+        if ((off -= st[i].length) <= 0) {var style = st[i+1]; break;}
+
+      var stack = [line.text.charAt(pos)], re = /[(){}[\]]/;
+      function scan(line, from, to) {
+        if (!line.text) return;
+        var st = line.styles, pos = forward ? 0 : line.text.length - 1, cur;
+        for (var i = forward ? 0 : st.length - 2, e = forward ? st.length : -2; i != e; i += 2*d) {
+          var text = st[i];
+          if (st[i+1] != style) {pos += d * text.length; continue;}
+          for (var j = forward ? 0 : text.length - 1, te = forward ? text.length : -1; j != te; j += d, pos+=d) {
+            if (pos >= from && pos < to && re.test(cur = text.charAt(j))) {
+              var match = matching[cur];
+              if (match.charAt(1) == ">" == forward) stack.push(cur);
+              else if (stack.pop() != match.charAt(0)) return {pos: pos, match: false};
+              else if (!stack.length) return {pos: pos, match: true};
+            }
+          }
+        }
+      }
+      for (var i = head.line, e = forward ? Math.min(i + 100, doc.size) : Math.max(-1, i - 100); i != e; i+=d) {
+        var line = getLine(i), first = i == head.line;
+        var found = scan(line, first && forward ? pos + 1 : 0, first && !forward ? pos : line.text.length);
+        if (found) break;
+      }
+      if (!found) found = {pos: null, match: false};
+      var style = found.match ? "CodeMirror-matchingbracket" : "CodeMirror-nonmatchingbracket";
+      var one = markText({line: head.line, ch: pos}, {line: head.line, ch: pos+1}, style),
+          two = found.pos != null && markText({line: i, ch: found.pos}, {line: i, ch: found.pos + 1}, style);
+      var clear = operation(function(){one.clear(); two && two.clear();});
+      if (autoclear) setTimeout(clear, 800);
+      else bracketHighlighted = clear;
+    }
+
+    // Finds the line to start with when starting a parse. Tries to
+    // find a line with a stateAfter, so that it can start with a
+    // valid state. If that fails, it returns the line with the
+    // smallest indentation, which tends to need the least context to
+    // parse correctly.
+    function findStartLine(n) {
+      var minindent, minline;
+      for (var search = n, lim = n - 40; search > lim; --search) {
+        if (search == 0) return 0;
+        var line = getLine(search-1);
+        if (line.stateAfter) return search;
+        var indented = line.indentation(options.tabSize);
+        if (minline == null || minindent > indented) {
+          minline = search - 1;
+          minindent = indented;
+        }
+      }
+      return minline;
+    }
+    function getStateBefore(n) {
+      var pos = findStartLine(n), state = pos && getLine(pos-1).stateAfter;
+      if (!state) state = startState(mode);
+      else state = copyState(mode, state);
+      doc.iter(pos, n, function(line) {
+        line.process(mode, state, options.tabSize);
+        line.stateAfter = (pos == n - 1 || pos % 5 == 0) ? copyState(mode, state) : null;
+      });
+      return state;
+    }
+    function highlightWorker() {
+      if (frontier >= showingTo) return;
+      var end = +new Date + options.workTime, state = copyState(mode, getStateBefore(frontier));
+      var startFrontier = frontier;
+      doc.iter(frontier, showingTo, function(line) {
+        if (frontier >= showingFrom) { // Visible
+          line.highlight(mode, state, options.tabSize);
+          line.stateAfter = copyState(mode, state);
+        } else {
+          line.process(mode, state, options.tabSize);
+          line.stateAfter = frontier % 5 == 0 ? copyState(mode, state) : null;
+        }
+        ++frontier;
+        if (+new Date > end) {
+          startWorker(options.workDelay);
+          return true;
+        }
+      });
+      if (showingTo > startFrontier && frontier >= showingFrom)
+        operation(function() {changes.push({from: startFrontier, to: frontier});})();
+    }
+    function startWorker(time) {
+      if (frontier < showingTo)
+        highlight.set(time, highlightWorker);
+    }
+
+    // Operations are used to wrap changes in such a way that each
+    // change won't have to update the cursor and display (which would
+    // be awkward, slow, and error-prone), but instead updates are
+    // batched and then all combined and executed at once.
+    function startOperation() {
+      updateInput = userSelChange = textChanged = null;
+      changes = []; selectionChanged = false; callbacks = [];
+    }
+    function endOperation() {
+      if (updateMaxLine) computeMaxLength();
+      if (maxLineChanged && !options.lineWrapping) {
+        var cursorWidth = widthForcer.offsetWidth, left = measureLine(maxLine, maxLine.text.length).left;
+        if (!ie_lt8) {
+          widthForcer.style.left = left + "px";
+          lineSpace.style.minWidth = (left + cursorWidth) + "px";
+        }
+        maxLineChanged = false;
+      }
+      var newScrollPos, updated;
+      if (selectionChanged) {
+        var coords = calculateCursorCoords();
+        newScrollPos = calculateScrollPos(coords.x, coords.y, coords.x, coords.yBot);
+      }
+      if (changes.length || newScrollPos && newScrollPos.scrollTop != null)
+        updated = updateDisplay(changes, true, newScrollPos && newScrollPos.scrollTop);
+      if (!updated) {
+        if (selectionChanged) updateSelection();
+        if (gutterDirty) updateGutter();
+      }
+      if (newScrollPos) scrollCursorIntoView();
+      if (selectionChanged) restartBlink();
+
+      if (focused && (updateInput === true || (updateInput !== false && selectionChanged)))
+        resetInput(userSelChange);
+
+      if (selectionChanged && options.matchBrackets)
+        setTimeout(operation(function() {
+          if (bracketHighlighted) {bracketHighlighted(); bracketHighlighted = null;}
+          if (posEq(sel.from, sel.to)) matchBrackets(false);
+        }), 20);
+      var sc = selectionChanged, cbs = callbacks; // these can be reset by callbacks
+      if (textChanged && options.onChange && instance)
+        options.onChange(instance, textChanged);
+      if (sc && options.onCursorActivity)
+        options.onCursorActivity(instance);
+      for (var i = 0; i < cbs.length; ++i) cbs[i](instance);
+      if (updated && options.onUpdate) options.onUpdate(instance);
+    }
+    var nestedOperation = 0;
+    function operation(f) {
+      return function() {
+        if (!nestedOperation++) startOperation();
+        try {var result = f.apply(this, arguments);}
+        finally {if (!--nestedOperation) endOperation();}
+        return result;
+      };
+    }
+
+    function compoundChange(f) {
+      history.startCompound();
+      try { return f(); } finally { history.endCompound(); }
+    }
+
+    for (var ext in extensions)
+      if (extensions.propertyIsEnumerable(ext) &&
+          !instance.propertyIsEnumerable(ext))
+        instance[ext] = extensions[ext];
+    for (var i = 0; i < initHooks.length; ++i) initHooks[i](instance);
+    return instance;
+  } // (end of function CodeMirror)
+
+  // The default configuration options.
+  CodeMirror.defaults = {
+    value: "",
+    mode: null,
+    theme: "default",
+    indentUnit: 2,
+    indentWithTabs: false,
+    smartIndent: true,
+    tabSize: 4,
+    keyMap: "default",
+    extraKeys: null,
+    electricChars: true,
+    autoClearEmptyLines: false,
+    onKeyEvent: null,
+    onDragEvent: null,
+    lineWrapping: false,
+    lineNumbers: false,
+    gutter: false,
+    fixedGutter: false,
+    firstLineNumber: 1,
+    readOnly: false,
+    dragDrop: true,
+    onChange: null,
+    onCursorActivity: null,
+    onViewportChange: null,
+    onGutterClick: null,
+    onUpdate: null,
+    onFocus: null, onBlur: null, onScroll: null,
+    matchBrackets: false,
+    cursorBlinkRate: 530,
+    workTime: 100,
+    workDelay: 200,
+    pollInterval: 100,
+    undoDepth: 40,
+    tabindex: null,
+    autofocus: null,
+    lineNumberFormatter: function(integer) { return integer; }
+  };
+
+  var ios = /AppleWebKit/.test(navigator.userAgent) && /Mobil

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