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

// CodeMirror is the only global var we claim var CodeMirror = (function () {

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

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

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

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

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

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

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

    if (options.dragDrop) {
        connect(lineSpace, "dragstart", onDragStart);
        function drag_(e) {
            if (options.onDragEvent && options.onDragEvent(instance, addStop(e))) return;
            e_stop(e);
        }

        connect(scroller, "dragenter", drag_);
        connect(scroller, "dragover", drag_);
        connect(scroller, "drop", operation(onDrop));
    }
    connect(scroller, "paste", function () {
        focusInput();
        fastPoll();
    });
    connect(input, "paste", fastPoll);
    connect(input, "cut", operation(function () {
        if (!options.readOnly) replaceSelection("");
    }));

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

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

    function isLine(l) {
        return l >= 0 && l < doc.size;
    }

    // The instance object that we'll return. Mostly calls out to
    // local functions in the CodeMirror function. Some do some extra
    // range checking and/or clipping. operation is used to wrap the
    // call so that changes it makes are tracked, and the display is
    // updated afterwards.
    var instance = wrapper.CodeMirror = {
        getValue:getValue,
        setValue:operation(setValue),
        getSelection:getSelection,
        replaceSelection:operation(replaceSelection),
        focus:function () {
            window.focus();
            focusInput();
            onFocus();
            fastPoll();
        },
        setOption:function (option, value) {
            var oldVal = options[option];
            options[option] = value;
            if (option == "mode" || option == "indentUnit") loadMode();
            else if (option == "readOnly" && value == "nocursor") {
                onBlur();
                input.blur();
            }
            else if (option == "readOnly" && !value) {
                resetInput(true);
            }
            else if (option == "theme") themeChanged();
            else if (option == "lineWrapping" && oldVal != value) operation(wrappingChanged)();
            else if (option == "tabSize") updateDisplay(true);
            else if (option == "keyMap") keyMapChanged();
            if (option == "lineNumbers" || option == "gutter" || option == "firstLineNumber" || option == "theme") {
                gutterChanged();
                updateDisplay(true);
            }
        },
        getOption:function (option) {
            return options[option];
        },
        undo:operation(undo),
        redo:operation(redo),
        indentLine:operation(function (n, dir) {
            if (typeof dir != "string") {
                if (dir == null) dir = options.smartIndent ? "smart" : "prev";
                else dir = dir ? "add" : "subtract";
            }
            if (isLine(n)) indentLine(n, dir);
        }),
        indentSelection:operation(indentSelected),
        historySize:function () {
            return {undo:history.done.length, redo:history.undone.length};
        },
        clearHistory:function () {
            history = new History();
        },
        matchBrackets:operation(function () {
            matchBrackets(true);
        }),
        getTokenAt:operation(function (pos) {
            pos = clipPos(pos);
            return getLine(pos.line).getTokenAt(mode, getStateBefore(pos.line), pos.ch);
        }),
        getStateAfter:function (line) {
            line = clipLine(line == null ? doc.size - 1 : line);
            return getStateBefore(line + 1);
        },
        cursorCoords:function (start, mode) {
            if (start == null) start = sel.inverted;
            return this.charCoords(start ? sel.from : sel.to, mode);
        },
        charCoords:function (pos, mode) {
            pos = clipPos(pos);
            if (mode == "local") return localCoords(pos, false);
            if (mode == "div") return localCoords(pos, true);
            return pageCoords(pos);
        },
        coordsChar:function (coords) {
            var off = eltOffset(lineSpace);
            return coordsChar(coords.x - off.left, coords.y - off.top);
        },
        markText:operation(markText),
        setBookmark:setBookmark,
        findMarksAt:findMarksAt,
        setMarker:operation(addGutterMarker),
        clearMarker:operation(removeGutterMarker),
        setLineClass:operation(setLineClass),
        hideLine:operation(function (h) {
            return setLineHidden(h, true);
        }),
        showLine:operation(function (h) {
            return setLineHidden(h, false);
        }),
        onDeleteLine:function (line, f) {
            if (typeof line == "number") {
                if (!isLine(line)) return null;
                line = getLine(line);
            }
            (line.handlers || (line.handlers = [])).push(f);
            return line;
        },
        lineInfo:lineInfo,
        addWidget:function (pos, node, scroll, vert, horiz) {
            pos = localCoords(clipPos(pos));
            var top = pos.yBot, left = pos.x;
            node.style.position = "absolute";
            code.appendChild(node);
            if (vert == "over") top = pos.y;
            else if (vert == "near") {
                var vspace = Math.max(scroller.offsetHeight, doc.height * textHeight()),
                    hspace = Math.max(code.clientWidth, lineSpace.clientWidth) - paddingLeft();
                if (pos.yBot + node.offsetHeight > vspace && pos.y > node.offsetHeight)
                    top = pos.y - node.offsetHeight;
                if (left + node.offsetWidth > hspace)
                    left = hspace - node.offsetWidth;
            }
            node.style.top = (top + paddingTop()) + "px";
            node.style.left = node.style.right = "";
            if (horiz == "right") {
                left = code.clientWidth - node.offsetWidth;
                node.style.right = "0px";
            } else {
                if (horiz == "left") left = 0;
                else if (horiz == "middle") left = (code.clientWidth - node.offsetWidth) / 2;
                node.style.left = (left + paddingLeft()) + "px";
            }
            if (scroll)
                scrollIntoView(left, top, left + node.offsetWidth, top + node.offsetHeight);
        },

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

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

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

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

    function getLine(n) {
        return getLineAt(doc, n);
    }

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

    function setValue(code) {
        var top = {line:0, ch:0};
        updateLines(top, {line:doc.size - 1, ch:getLine(doc.size - 1).text.length},
            splitLines(code), top, top);
        updateInput = true;
    }

    function getValue() {
        var text = [];
        doc.iter(0, doc.size, function (line) {
            text.push(line.text);
        });
        return text.join("\n");
    }

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

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

        var start = posFromMouse(e);

        switch (e_button(e)) {
            case 3:
                if (gecko && !mac) onContextMenu(e);
                return;
            case 2:
                if (start) setCursor(start.line, start.ch, true);
                return;
        }
        // For button 1, if it was clicked inside the editor
        // (posFromMouse returning non-null), we have to adjust the
        // selection.
        if (!start) {
            if (e_target(e) == scroller) e_preventDefault(e);
            return;
        }

        if (!focused) onFocus();

        var now = +new Date;
        if (lastDoubleClick && lastDoubleClick.time > now - 400 && posEq(lastDoubleClick.pos, start)) {
            e_preventDefault(e);
            setTimeout(focusInput, 20);
            return selectLine(start.line);
        } else if (lastClick && lastClick.time > now - 400 && posEq(lastClick.pos, start)) {
            lastDoubleClick = {time:now, pos:start};
            e_preventDefault(e);
            return selectWordAt(start);
        } else {
            lastClick = {time:now, pos:start};
        }

        var last = start, going;
        if (options.dragDrop && dragAndDrop && !options.readOnly && !posEq(sel.from, sel.to) &&
            !posLess(start, sel.from) && !posLess(sel.to, start)) {
            // Let the drag handler handle this.
            if (webkit) lineSpace.draggable = true;
            function dragEnd(e2) {
                if (webkit) lineSpace.draggable = false;
                draggingText = false;
                up();
                drop();
                if (Math.abs(e.clientX - e2.clientX) + Math.abs(e.clientY - e2.clientY) < 10) {
                    e_preventDefault(e2);
                    setCursor(start.line, start.ch, true);
                    focusInput();
                }
            }

            var up = connect(document, "mouseup", operation(dragEnd), true);
            var drop = connect(scroller, "drop", operation(dragEnd), true);
            draggingText = true;
            // IE's approach to draggable
            if (lineSpace.dragDrop) lineSpace.dragDrop();
            return;
        }
        e_preventDefault(e);
        setCursor(start.line, start.ch, true);

        function extend(e) {
            var cur = posFromMouse(e, true);
            if (cur && !posEq(cur, last)) {
                if (!focused) onFocus();
                last = cur;
                setSelectionUser(start, cur);
                updateInput = false;
                var visible = visibleLines();
                if (cur.line >= visible.to || cur.line < visible.from)
                    going = setTimeout(operation(function () {
                        extend(e);
                    }), 150);
            }
        }

        function done(e) {
            clearTimeout(going);
            var cur = posFromMouse(e);
            if (cur) setSelectionUser(start, cur);
            e_preventDefault(e);
            focusInput();
            updateInput = true;
            move();
            up();
        }

        var move = connect(document, "mousemove", operation(function (e) {
            clearTimeout(going);
            e_preventDefault(e);
            if (!ie && !e_button(e)) done(e);
            else extend(e);
        }), true);
        var up = connect(document, "mouseup", operation(done), true);
    }

    function onDoubleClick(e) {
        for (var n = e_target(e); n != wrapper; n = n.parentNode)
            if (n.parentNode == gutterText) return e_preventDefault(e);
        var start = posFromMouse(e);
        if (!start) return;
        lastDoubleClick = {time:+new Date, pos:start};
        e_preventDefault(e);
        selectWordAt(start);
    }

    function onDrop(e) {
        if (options.onDragEvent && options.onDragEvent(instance, addStop(e))) return;
        e.preventDefault();
        var pos = posFromMouse(e, true), files = e.dataTransfer.files;
        if (!pos || options.readOnly) return;
        if (files && files.length && window.FileReader && window.File) {
            function loadFile(file, i) {
                var reader = new FileReader;
                reader.onload = function () {
                    text[i] = reader.result;
                    if (++read == n) {
                        pos = clipPos(pos);
                        operation(function () {
                            var end = replaceRange(text.join(""), pos, pos);
                            setSelectionUser(pos, end);
                        })();
                    }
                };
                reader.readAsText(file);
            }

            var n = files.length, text = Array(n), read = 0;
            for (var i = 0; i < n; ++i) loadFile(files[i], i);
        }
        else {
            try {
                var text = e.dataTransfer.getData("Text");
                if (text) {
                    compoundChange(function () {
                        var curFrom = sel.from, curTo = sel.to;
                        setSelectionUser(pos, pos);
                        if (draggingText) replaceRange("", curFrom, curTo);
                        replaceSelection(text);
                        focusInput();
                    });
                }
            }
            catch (e) {
            }
        }
    }

    function onDragStart(e) {
        var txt = getSelection();
        e.dataTransfer.setData("Text", txt);

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

    function doHandleBinding(bound, dropShift) {
        if (typeof bound == "string") {
            bound = commands[bound];
            if (!bound) return false;
        }
        var prevShift = shiftSelecting;
        try {
            if (options.readOnly) suppressEdits = true;
            if (dropShift) shiftSelecting = null;
            bound(instance);
        } catch (e) {
            if (e != Pass) throw e;
            return false;
        } finally {
            shiftSelecting = prevShift;
            suppressEdits = false;
        }
        return true;
    }

    function handleKeyBinding(e) {
        // Handle auto keymap transitions
        var startMap = getKeyMap(options.keyMap), next = startMap.auto;
        clearTimeout(maybeTransition);
        if (next && !isModifierKey(e)) maybeTransition = setTimeout(function () {
            if (getKeyMap(options.keyMap) == startMap) {
                options.keyMap = (next.call ? next.call(null, instance) : next);
            }
        }, 50);

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

        var stopped = false;

        function stop() {
            stopped = true;
        }

        if (e_prop(e, "shiftKey")) {
            handled = lookupKey("Shift-" + name, options.extraKeys, options.keyMap,
                function (b) {
                    return doHandleBinding(b, true);
                }, stop)
                || lookupKey(name, options.extraKeys, options.keyMap, function (b) {
                if (typeof b == "string" && /^go[A-Z]/.test(b)) return doHandleBinding(b);
            }, stop);
        } else {
            handled = lookupKey(name, options.extraKeys, options.keyMap, doHandleBinding, stop);
        }
        if (stopped) handled = false;
        if (handled) {
            e_preventDefault(e);
            restartBlink();
            if (ie) {
                e.oldKeyCode = e.keyCode;
                e.keyCode = 0;
            }
        }
        return handled;
    }

    function handleCharBinding(e, ch) {
        var handled = lookupKey("'" + ch + "'", options.extraKeys,
            options.keyMap, function (b) {
                return doHandleBinding(b, true);
            });
        if (handled) {
            e_preventDefault(e);
            restartBlink();
        }
        return handled;
    }

    var lastStoppedKey = null, maybeTransition;

    function onKeyDown(e) {
        if (!focused) onFocus();
        if (ie && e.keyCode == 27) {
            e.returnValue = false;
        }
        if (pollingFast) {
            if (readInput()) pollingFast = false;
        }
        if (options.onKeyEvent && options.onKeyEvent(instance, addStop(e))) return;
        var code = e_prop(e, "keyCode");
        // IE does strange things with escape.
        setShift(code == 16 || e_prop(e, "shiftKey"));
        // First give onKeyEvent option a chance to handle this.
        var handled = handleKeyBinding(e);
        if (window.opera) {
            lastStoppedKey = handled ? code : null;
            // Opera has no cut event... we try to at least catch the key combo
            if (!handled && code == 88 && e_prop(e, mac ? "metaKey" : "ctrlKey"))
                replaceSelection("");
        }
    }

    function onKeyPress(e) {
        if (pollingFast) readInput();
        if (options.onKeyEvent && options.onKeyEvent(instance, addStop(e))) return;
        var keyCode = e_prop(e, "keyCode"), charCode = e_prop(e, "charCode");
        if (window.opera && keyCode == lastStoppedKey) {
            lastStoppedKey = null;
            e_preventDefault(e);
            return;
        }
        if (((window.opera && !e.which) || khtml) && handleKeyBinding(e)) return;
        var ch = String.fromCharCode(charCode == null ? keyCode : charCode);
        if (options.electricChars && mode.electricChars && options.smartIndent && !options.readOnly) {
            if (mode.electricChars.indexOf(ch) > -1)
                setTimeout(operation(function () {
                    indentLine(sel.to.line, "smart");
                }), 75);
        }
        if (handleCharBinding(e, ch)) return;
        fastPoll();
    }

    function onKeyUp(e) {
        if (options.onKeyEvent && options.onKeyEvent(instance, addStop(e))) return;
        if (e_prop(e, "keyCode") == 16) shiftSelecting = null;
    }

    function onFocus() {
        if (options.readOnly == "nocursor") return;
        if (!focused) {
            if (options.onFocus) options.onFocus(instance);
            focused = true;
            if (wrapper.className.search(/\bCodeMirror-focused\b/) == -1)
                wrapper.className += " CodeMirror-focused";
            if (!leaveInputAlone) resetInput(true);
        }
        slowPoll();
        restartBlink();
    }

    function onBlur() {
        if (focused) {
            if (options.onBlur) options.onBlur(instance);
            focused = false;
            if (bracketHighlighted)
                operation(function () {
                    if (bracketHighlighted) {
                        bracketHighlighted();
                        bracketHighlighted = null;
                    }
                })();
            wrapper.className = wrapper.className.replace(" CodeMirror-focused", "");
        }
        clearInterval(blinker);
        setTimeout(function () {
            if (!focused) shiftSelecting = null;
        }, 150);
    }

    // Replace the range from from to to by the strings in newText.
    // Afterwards, set the selection to selFrom, selTo.
    function updateLines(from, to, newText, selFrom, selTo) {
        if (suppressEdits) return;
        if (history) {
            var old = [];
            doc.iter(from.line, to.line + 1, function (line) {
                old.push(line.text);
            });
            history.addChange(from.line, newText.length, old);
            while (history.done.length > options.undoDepth) history.done.shift();
        }
        updateLinesNoUndo(from, to, newText, selFrom, selTo);
    }

    function unredoHelper(from, to) {
        if (!from.length) return;
        var set = from.pop(), out = [];
        for (var i = set.length - 1; i >= 0; i -= 1) {
            var change = set[i];
            var replaced = [], end = change.start + change.added;
            doc.iter(change.start, end, function (line) {
                replaced.push(line.text);
            });
            out.push({start:change.start, added:change.old.length, old:replaced});
            var pos = clipPos({line:change.start + change.old.length - 1,
                ch:editEnd(replaced[replaced.length - 1], change.old[change.old.length - 1])});
            updateLinesNoUndo({line:change.start, ch:0}, {line:end - 1, ch:getLine(end - 1).text.length}, change.old, pos, pos);
        }
        updateInput = true;
        to.push(out);
    }

    function undo() {
        unredoHelper(history.done, history.undone);
    }

    function redo() {
        unredoHelper(history.undone, history.done);
    }

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

        var nlines = to.line - from.line, firstLine = getLine(from.line), lastLine = getLine(to.line);
        // First adjust the line structure, taking some care to leave highlighting intact.
        if (from.ch == 0 && to.ch == 0 && newText[newText.length - 1] == "") {
            // This is a whole-line replace. Treated specially to make
            // sure line objects move the way they are supposed to.
            var added = [], prevLine = null;
            if (from.line) {
                prevLine = getLine(from.line - 1);
                prevLine.fixMarkEnds(lastLine);
            } else lastLine.fixMarkStarts();
            for (var i = 0, e = newText.length - 1; i < e; ++i)
                added.push(Line.inheritMarks(newText[i], prevLine));
            if (nlines) doc.remove(from.line, nlines, callbacks);
            if (added.length) doc.insert(from.line, added);
        } else if (firstLine == lastLine) {
            if (newText.length == 1)
                firstLine.replace(from.ch, to.ch, newText[0]);
            else {
                lastLine = firstLine.split(to.ch, newText[newText.length - 1]);
                firstLine.replace(from.ch, null, newText[0]);
                firstLine.fixMarkEnds(lastLine);
                var added = [];
                for (var i = 1, e = newText.length - 1; i < e; ++i)
                    added.push(Line.inheritMarks(newText[i], firstLine));
                added.push(lastLine);
                doc.insert(from.line + 1, added);
            }
        } else if (newText.length == 1) {
            firstLine.replace(from.ch, null, newText[0]);
            lastLine.replace(null, to.ch, "");
            firstLine.append(lastLine);
            doc.remove(from.line + 1, nlines, callbacks);
        } else {
            var added = [];
            firstLine.replace(from.ch, null, newText[0]);
            lastLine.replace(null, to.ch, newText[newText.length - 1]);
            firstLine.fixMarkEnds(lastLine);
            for (var i = 1, e = newText.length - 1; i < e; ++i)
                added.push(Line.inheritMarks(newText[i], firstLine));
            if (nlines > 1) doc.remove(from.line + 1, nlines - 1, callbacks);
            doc.insert(from.line + 1, added);
        }
        if (options.lineWrapping) {
            var perLine = Math.max(5, scroller.clientWidth / charWidth() - 3);
            doc.iter(from.line, from.line + newText.length, function (line) {
                if (line.hidden) return;
                var guess = Math.ceil(line.text.length / perLine) || 1;
                if (guess != line.height) updateLineHeight(line, guess);
            });
        } else {
            doc.iter(from.line, from.line + newText.length, function (line) {
                var l = line.text;
                if (l.length > maxLineLength) {
                    maxLine = l;
                    maxLineLength = l.length;
                    maxWidth = null;
                    recomputeMaxLength = false;
                }
            });
            if (recomputeMaxLength) {
                maxLineLength = 0;
                maxLine = "";
                maxWidth = null;
                doc.iter(0, doc.size, function (line) {
                    var l = line.text;
                    if (l.length > maxLineLength) {
                        maxLineLength = l.length;
                        maxLine = l;
                    }
                });
            }
        }

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

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

        setSelection(selFrom, selTo, updateLine(sel.from.line), updateLine(sel.to.line));

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

    function replaceRange(code, from, to) {
        from = clipPos(from);
        if (!to) to = from; else to = clipPos(to);
        code = splitLines(code);
        function adjustPos(pos) {
            if (posLess(pos, from)) return pos;
            if (!posLess(to, pos)) return end;
            var line = pos.line + code.length - (to.line - from.line) - 1;
            var ch = pos.ch;
            if (pos.line == to.line)
                ch += code[code.length - 1].length - (to.ch - (to.line == from.line ? from.ch : 0));
            return {line:line, ch:ch};
        }

        var end;
        replaceRange1(code, from, to, function (end1) {
            end = end1;
            return {from:adjustPos(sel.from), to:adjustPos(sel.to)};
        });
        return end;
    }

    function replaceSelection(code, collapse) {
        replaceRange1(splitLines(code), sel.from, sel.to, function (end) {
            if (collapse == "end") return {from:end, to:end};
            else if (collapse == "start") return {from:sel.from, to:sel.from};
            else return {from:sel.from, to:end};
        });
    }

    function replaceRange1(code, from, to, computeSel) {
        var endch = code.length == 1 ? code[0].length + from.ch : code[code.length - 1].length;
        var newSel = computeSel({line:from.line + code.length - 1, ch:endch});
        updateLines(from, to, code, newSel.from, newSel.to);
    }

    function getRange(from, to) {
        var l1 = from.line, l2 = to.line;
        if (l1 == l2) return getLine(l1).text.slice(from.ch, to.ch);
        var code = [getLine(l1).text.slice(from.ch)];
        doc.iter(l1 + 1, l2, function (line) {
            code.push(line.text);
        });
        code.push(getLine(l2).text.slice(0, to.ch));
        return code.join("\n");
    }

    function getSelection() {
        return getRange(sel.from, sel.to);
    }

    var pollingFast = false; // Ensures slowPoll doesn't cancel fastPoll
    function slowPoll() {
        if (pollingFast) return;
        poll.set(options.pollInterval, function () {
            startOperation();
            readInput();
            if (focused) slowPoll();
            endOperation();
        });
    }

    function fastPoll() {
        var missed = false;
        pollingFast = true;
        function p() {
            startOperation();
            var changed = readInput();
            if (!changed && !missed) {
                missed = true;
                poll.set(60, p);
            }
            else {
                pollingFast = false;
                slowPoll();
            }
            endOperation();
        }

        poll.set(20, p);
    }

    // Previnput is a hack to work with IME. If we reset the textarea
    // on every change, that breaks IME. So we look for changes
    // compared to the previous content instead. (Modern browsers have
    // events that indicate IME taking place, but these are not widely
    // supported or compatible enough yet to rely on.)
    var prevInput = "";

    function readInput() {
        if (leaveInputAlone || !focused || hasSelection(input) || options.readOnly) return false;
        var text = input.value;
        if (text == prevInput) return false;
        shiftSelecting = null;
        var same = 0, l = Math.min(prevInput.length, text.length);
        while (same < l && prevInput[same] == text[same]) ++same;
        if (same < prevInput.length)
            sel.from = {line:sel.from.line, ch:sel.from.ch - (prevInput.length - same)};
        else if (overwrite && posEq(sel.from, sel.to))
            sel.to = {line:sel.to.line, ch:Math.min(getLine(sel.to.line).text.length, sel.to.ch + (text.length - same))};
        replaceSelection(text.slice(same), "end");
        prevInput = text;
        return true;
    }

    function resetInput(user) {
        if (!posEq(sel.from, sel.to)) {
            prevInput = "";
            input.value = getSelection();
            selectInput(input);
        } else if (user) prevInput = input.value = "";
    }

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

    function scrollEditorIntoView() {
        if (!cursor.getBoundingClientRect) return;
        var rect = cursor.getBoundingClientRect();
        // IE returns bogus coordinates when the instance sits inside of an iframe and the cursor is hidden
        if (ie && rect.top == rect.bottom) return;
        var winH = window.innerHeight || Math.max(document.body.offsetHeight, document.documentElement.offsetHeight);
        if (rect.top < 0 || rect.bottom > winH) cursor.scrollIntoView();
    }

    function scrollCursorIntoView() {
        var cursor = localCoords(sel.inverted ? sel.from : sel.to);
        var x = options.lineWrapping ? Math.min(cursor.x, lineSpace.offsetWidth) : cursor.x;
        return scrollIntoView(x, cursor.y, x, cursor.yBot);
    }

    function scrollIntoView(x1, y1, x2, y2) {
        var pl = paddingLeft(), pt = paddingTop();
        y1 += pt;
        y2 += pt;
        x1 += pl;
        x2 += pl;
        var screen = scroller.clientHeight, screentop = scroller.scrollTop, scrolled = false, result = true;
        if (y1 < screentop) {
            scroller.scrollTop = Math.max(0, y1);
            scrolled = true;
        }
        else if (y2 > screentop + screen) {
            scroller.scrollTop = y2 - screen;
            scrolled = true;
        }

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

    function visibleLines() {
        var lh = textHeight(), top = scroller.scrollTop - paddingTop();
        var fromHeight = Math.max(0, Math.floor(top / lh));
        var toHeight = Math.ceil((top + scroller.clientHeight) / lh);
        return {from:lineAtHeight(doc, fromHeight),
            to:lineAtHeight(doc, toHeight)};
    }

    // Uses a set of changes plus the current scroll position to
    // determine which DOM updates have to be made, and makes the
    // updates.
    function updateDisplay(changes, suppressCallback) {
        if (!scroller.clientWidth) {
            showingFrom = showingTo = displayOffset = 0;
            return;
        }
        // Compute the new visible window
        var visible = visibleLines();
        // Bail out if the visible area is already rendered and nothing changed.
        if (changes !== true && changes.length == 0 && visible.from > showingFrom && visible.to < showingTo) return;
        var from = Math.max(visible.from - 100, 0), to = Math.min(doc.size, visible.to + 100);
        if (showingFrom < from && from - showingFrom < 20) from = showingFrom;
        if (showingTo > to && showingTo - to < 20) to = Math.min(doc.size, showingTo);

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

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

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

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

        function checkHeights() {
            maxWidth = scroller.clientWidth;
            var curNode = lineDiv.firstChild, heightChanged = false;
            doc.iter(showingFrom, showingTo, function (line) {
                if (!line.hidden) {
                    var height = Math.round(curNode.offsetHeight / th) || 1;
                    if (line.height != height) {
                        updateLineHeight(line, height);
                        gutterDirty = heightChanged = true;
                    }
                }
                curNode = curNode.nextSibling;
            });
            if (heightChanged)
                code.style.height = (doc.height * th + 2 * paddingTop()) + "px";
            return heightChanged;
        }

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

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

    function computeIntact(intact, changes) {
        for (var i = 0, l = changes.length || 0; i < l; ++i) {
            var change = changes[i], intact2 = [], diff = change.diff || 0;
            for (var j = 0, l2 = intact.length; j < l2; ++j) {
                var range = intact[j];
                if (change.to <= range.from && change.diff)
                    intact2.push({from:range.from + diff, to:range.to + diff,
                        domStart:range.domStart});
                else if (change.to <= range.from || change.from >= range.to)
                    intact2.push(range);
                else {
                    if (change.from > range.from)
                        intact2.push({from:range.from, to:change.from, domStart:range.domStart});
                    if (change.to < range.to)
                        intact2.push({from:change.to + diff, to:range.to + diff,
                            domStart:range.domStart + (change.to - range.from)});
                }
            }
            intact = intact2;
        }
        return intact;
    }

    function patchDisplay(from, to, intact) {
        // The first pass removes the DOM nodes that aren't intact.
        if (!intact.length) lineDiv.innerHTML = "";
        else {
            function killNode(node) {
                var tmp = node.nextSibling;
                node.parentNode.removeChild(node);
                return tmp;
            }

            var domPos = 0, curNode = lineDiv.firstChild, n;
            for (var i = 0; i < intact.length; ++i) {
                var cur = intact[i];
                while (cur.domStart > domPos) {
                    curNode = killNode(curNode);
                    domPos++;
                }
                for (var j = 0, e = cur.to - cur.from; j < e; ++j) {
                    curNode = curNode.nextSibling;
                    domPos++;
                }
            }
            while (curNode) curNode = killNode(curNode);
        }
        // This pass fills in the lines that actually changed.
        var nextIntact = intact.shift(), curNode = lineDiv.firstChild, j = from;
        var scratch = document.createElement("div");
        doc.iter(from, to, function (line) {
            if (nextIntact && nextIntact.to == j) nextIntact = intact.shift();
            if (!nextIntact || nextIntact.from > j) {
                if (line.hidden) var html = scratch.innerHTML = "<pre></pre>";
                else {
                    var html = '<pre' + (line.className ? ' class="' + line.className + '"' : '') + '>'
                        + line.getHTML(makeTab) + '</pre>';
                    // Kludge to make sure the styled element lies behind the selection (by z-index)
                    if (line.bgClassName)
                        html = '<div style="position: relative"><pre class="' + line.bgClassName +
                            '" style="position: absolute; left: 0; right: 0; top: 0; bottom: 0; z-index: -2">&#160;</pre>' + html + "</div>";
                }
                scratch.innerHTML = html;
                lineDiv.insertBefore(scratch.firstChild, curNode);
            } else {
                curNode = curNode.nextSibling;
            }
            ++j;
        });
    }

    function updateGutter() {
        if (!options.gutter && !options.lineNumbers) return;
        var hText = mover.offsetHeight, hEditor = scroller.clientHeight;
        gutter.style.height = (hText - hEditor < 2 ? hEditor : hText) + "px";
        var html = [], i = showingFrom, normalNode;
        doc.iter(showingFrom, Math.max(showingTo, showingFrom + 1), function (line) {
            if (line.hidden) {
                html.push("<pre></pre>");
            } else {
                var marker = line.gutterMarker;
                var text = options.lineNumbers ? i + options.firstLineNumber : null;
                if (marker && marker.text)
                    text = marker.text.replace("%N%", text != null ? text : "");
                else if (text == null)
                    text = "\u00a0";
                html.push((marker && marker.style ? '<pre class="' + marker.style + '">' : "<pre>"), text);
                for (var j = 1; j < line.height; ++j) html.push("<br/>&#160;");
                html.push("</pre>");
                if (!marker) normalNode = i;
            }
            ++i;
        });
        gutter.style.display = "none";
        gutterText.innerHTML = html.join("");
        // Make sure scrolling doesn't cause number gutter size to pop
        if (normalNode != null) {
            var node = gutterText.childNodes[normalNode - showingFrom];
            var minwidth = String(doc.size).length, val = eltText(node), pad = "";
            while (val.length + pad.length < minwidth) pad += "\u00a0";
            if (pad) node.insertBefore(document.createTextNode(pad), node.firstChild);
        }
        gutter.style.display = "";
        var resized = Math.abs((parseInt(lineSpace.style.marginLeft) || 0) - gutter.offsetWidth) > 2;
        lineSpace.style.marginLeft = gutter.offsetWidth + "px";
        gutterDirty = false;
        return resized;
    }

    function updateSelection() {
        var collapsed = posEq(sel.from, sel.to);
        var fromPos = localCoords(sel.from, true);
        var toPos = collapsed ? fromPos : localCoords(sel.to, true);
        var headPos = sel.inverted ? fromPos : toPos, th = textHeight();
        var wrapOff = eltOffset(wrapper), lineOff = eltOffset(lineDiv);
        inputDiv.style.top = Math.max(0, Math.min(scroller.offsetHeight, headPos.y + lineOff.top - wrapOff.top)) + "px";
        inputDiv.style.left = Math.max(0, Math.min(scroller.offsetWidth, headPos.x + lineOff.left - wrapOff.left)) + "px";
        if (collapsed) {
            cursor.style.top = headPos.y + "px";
            cursor.style.left = (options.lineWrapping ? Math.min(headPos.x, lineSpace.offsetWidth) : headPos.x) + "px";
            cursor.style.display = "";
            selectionDiv.style.display = "none";
        } else {
            var sameLine = fromPos.y == toPos.y, html = "";
            var clientWidth = lineSpace.clientWidth || lineSpace.offsetWidth;
            var clientHeight = lineSpace.clientHeight || lineSpace.offsetHeight;

            function add(left, top, right, height) {
                var rstyle = quirksMode ? "width: " + (!right ? clientWidth : clientWidth - right - left) + "px"
                    : "right: " + right + "px";
                html += '<div class="CodeMirror-selected" style="position: absolute; left: ' + left +
                    'px; top: ' + top + 'px; ' + rstyle + '; height: ' + height + 'px"></div>';
            }

            if (sel.from.ch && fromPos.y >= 0) {
                var right = sameLine ? clientWidth - toPos.x : 0;
                add(fromPos.x, fromPos.y, right, th);
            }
            var middleStart = Math.max(0, fromPos.y + (sel.from.ch ? th : 0));
            var middleHeight = Math.min(toPos.y, clientHeight) - middleStart;
            if (middleHeight > 0.2 * th)
                add(0, middleStart, 0, middleHeight);
            if ((!sameLine || !sel.from.ch) && toPos.y < clientHeight - .5 * th)
                add(0, toPos.y, clientWidth - toPos.x, th);
            selectionDiv.innerHTML = html;
            cursor.style.display = "none";
            selectionDiv.style.display = "";
        }
    }

    function setShift(val) {
        if (val) shiftSelecting = shiftSelecting || (sel.inverted ? sel.to : sel.from);
        else shiftSelecting = null;
    }

    function setSelectionUser(from, to) {
        var sh = shiftSelecting && clipPos(shiftSelecting);
        if (sh) {
            if (posLess(sh, from)) from = sh;
            else if (posLess(to, sh)) to = sh;
        }
        setSelection(from, to);
        userSelChange = true;
    }

    // Update the selection. Last two args are only used by
    // updateLines, since they have to be expressed in the line
    // numbers before the update.
    function setSelection(from, to, oldFrom, oldTo) {
        goalColumn = null;
        if (oldFrom == null) {
            oldFrom = sel.from.line;
            oldTo = sel.to.line;
        }
        if (posEq(sel.from, from) && posEq(sel.to, to)) return;
        if (posLess(to, from)) {
            var tmp = to;
            to = from;
            from = tmp;
        }

        // Skip over hidden lines.
        if (from.line != oldFrom) {
            var from1 = skipHidden(from, oldFrom, sel.from.ch);
            // If there is no non-hidden line left, force visibility on current line
            if (!from1) setLineHidden(from.line, false);
            else from = from1;
        }
        if (to.line != oldTo) to = skipHidden(to, oldTo, sel.to.ch);

        if (posEq(from, to)) sel.inverted = false;
        else if (posEq(from, sel.to)) sel.inverted = false;
        else if (posEq(to, sel.from)) sel.inverted = true;

        if (options.autoClearEmptyLines && posEq(sel.from, sel.to)) {
            var head = sel.inverted ? from : to;
            if (head.line != sel.from.line && sel.from.line < doc.size) {
                var oldLine = getLine(sel.from.line);
                if (/^\s+$/.test(oldLine.text))
                    setTimeout(operation(function () {
                        if (oldLine.parent && /^\s+$/.test(oldLine.text)) {
                            var no = lineNo(oldLine);
                            replaceRange("", {line:no, ch:0}, {line:no, ch:oldLine.text.length});
                        }
                    }, 10));
            }
        }

        sel.from = from;
        sel.to = to;
        selectionChanged = true;
    }

    function skipHidden(pos, oldLine, oldCh) {
        function getNonHidden(dir) {
            var lNo = pos.line + dir, end = dir == 1 ? doc.size : -1;
            while (lNo != end) {
                var line = getLine(lNo);
                if (!line.hidden) {
                    var ch = pos.ch;
                    if (toEnd || ch > oldCh || ch > line.text.length) ch = line.text.length;
                    return {line:lNo, ch:ch};
                }
                lNo += dir;
            }
        }

        var line = getLine(pos.line);
        var toEnd = pos.ch == line.text.length && pos.ch != oldCh;
        if (!line.hidden) return pos;
        if (pos.line >= oldLine) return getNonHidden(1) || getNonHidden(-1);
        else return getNonHidden(-1) || getNonHidden(1);
    }

    function setCursor(line, ch, user) {
        var pos = clipPos({line:line, ch:ch || 0});
        (user ? setSelectionUser : setSelection)(pos, pos);
    }

    function clipLine(n) {
        return Math.max(0, Math.min(n, doc.size - 1));
    }

    function clipPos(pos) {
        if (pos.line < 0) return {line:0, ch:0};
        if (pos.line >= doc.size) return {line:doc.size - 1, ch:getLine(doc.size - 1).text.length};
        var ch = pos.ch, linelen = getLine(pos.line).text.length;
        if (ch == null || ch > linelen) return {line:pos.line, ch:linelen};
        else if (ch < 0) return {line:pos.line, ch:0};
        else return pos;
    }

    function findPosH(dir, unit) {
        var end = sel.inverted ? sel.from : sel.to, line = end.line, ch = end.ch;
        var lineObj = getLine(line);

        function findNextLine() {
            for (var l = line + dir, e = dir < 0 ? -1 : doc.size; l != e; l += dir) {
                var lo = getLine(l);
                if (!lo.hidden) {
                    line = l;
                    lineObj = lo;
                    return true;
                }
            }
        }

        function moveOnce(boundToLine) {
            if (ch == (dir < 0 ? 0 : lineObj.text.length)) {
                if (!boundToLine && findNextLine()) ch = dir < 0 ? lineObj.text.length : 0;
                else return false;
            } else ch += dir;
            return true;
        }

        if (unit == "char") moveOnce();
        else if (unit == "column") moveOnce(true);
        else if (unit == "word") {
            var sawWord = false;
            for (; ;) {
                if (dir < 0) if (!moveOnce()) break;
                if (isWordChar(lineObj.text.charAt(ch))) sawWord = true;
                else if (sawWord) {
                    if (dir < 0) {
                        dir = 1;
                        moveOnce();
                    }
                    break;
                }
                if (dir > 0) if (!moveOnce()) break;
            }
        }
        return {line:line, ch:ch};
    }

    function moveH(dir, unit) {
        var pos = dir < 0 ? sel.from : sel.to;
        if (shiftSelecting || posEq(sel.from, sel.to)) pos = findPosH(dir, unit);
        setCursor(pos.line, pos.ch, true);
    }

    function deleteH(dir, unit) {
        if (!posEq(sel.from, sel.to)) replaceRange("", sel.from, sel.to);
        else if (dir < 0) replaceRange("", findPosH(dir, unit), sel.to);
        else replaceRange("", sel.from, findPosH(dir, unit));
        userSelChange = true;
    }

    var goalColumn = null;

    function moveV(dir, unit) {
        var dist = 0, pos = localCoords(sel.inverted ? sel.from : sel.to, true);
        if (goalColumn != null) pos.x = goalColumn;
        if (unit == "page") dist = Math.min(scroller.clientHeight, window.innerHeight || document.documentElement.clientHeight);
        else if (unit == "line") dist = textHeight();
        var target = coordsChar(pos.x, pos.y + dist * dir + 2);
        if (unit == "page") scroller.scrollTop += localCoords(target, true).y - pos.y;
        setCursor(target.line, target.ch, true);
        goalColumn = pos.x;
    }

    function selectWordAt(pos) {
        var line = getLine(pos.line).text;
        var start = pos.ch, end = pos.ch;
        while (start > 0 && isWordChar(line.charAt(start - 1))) --start;
        while (end < line.length && isWordChar(line.charAt(end))) ++end;
        setSelectionUser({line:pos.line, ch:start}, {line:pos.line, ch:end});
    }

    function selectLine(line) {
        setSelectionUser({line:line, ch:0}, clipPos({line:line + 1, ch:0}));
    }

    function indentSelected(mode) {
        if (posEq(sel.from, sel.to)) return indentLine(sel.from.line, mode);
        var e = sel.to.line - (sel.to.ch ? 0 : 1);
        for (var i = sel.from.line; i <= e; ++i) indentLine(i, mode);
    }

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

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

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

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

    function loadMode() {
        mode = CodeMirror.getMode(options, options.mode);
        doc.iter(0, doc.size, function (line) {
            line.stateAfter = null;
        });
        work = [0];
        startWorker();
    }

    function gutterChanged() {
        var visible = options.gutter || options.lineNumbers;
        gutter.style.display = visible ? "" : "none";
        if (visible) gutterDirty = true;
        else lineDiv.parentNode.style.marginLeft = 0;
    }

    function wrappingChanged(from, to) {
        if (options.lineWrapping) {
            wrapper.className += " CodeMirror-wrap";
            var perLine = scroller.clientWidth / charWidth() - 3;
            doc.iter(0, doc.size, function (line) {
                if (line.hidden) return;
                var guess = Math.ceil(line.text.length / perLine) || 1;
                if (guess != 1) updateLineHeight(line, guess);
            });
            lineSpace.style.width = code.style.width = "";
        } else {
            wrapper.className = wrapper.className.replace(" CodeMirror-wrap", "");
            maxWidth = null;
            maxLine = "";
            doc.iter(0, doc.size, function (line) {
                if (line.height != 1 && !line.hidden) updateLineHeight(line, 1);
                if (line.text.length > maxLine.length) maxLine = line.text;
            });
        }
        changes.push({from:0, to:doc.size});
    }

    function makeTab(col) {
        var w = options.tabSize - col % options.tabSize, cached = tabCache[w];
        if (cached) return cached;
        for (var str = '<span class="cm-tab">', i = 0; i < w; ++i) str += " ";
        return (tabCache[w] = {html:str + "</span>", width:w});
    }

    function themeChanged() {
        scroller.className = scroller.className.replace(/\s*cm-s-\S+/g, "") +
            options.theme.replace(/(^|\s)\s*/g, " cm-s-");
    }

    function keyMapChanged() {
        var style = keyMap[options.keyMap].style;
        wrapper.className = wrapper.className.replace(/\s*cm-keymap-\S+/g, "") +
            (style ? " cm-keymap-" + style : "");
    }

    function TextMarker() {
        this.set = [];
    }

    TextMarker.prototype.clear = operation(function () {
        var min = Infinity, max = -Infinity;
        for (var i = 0, e = this.set.length; i < e; ++i) {
            var line = this.set[i], mk = line.marked;
            if (!mk || !line.parent) continue;
            var lineN = lineNo(line);
            min = Math.min(min, lineN);
            max = Math.max(max, lineN);
            for (var j = 0; j < mk.length; ++j)
                if (mk[j].marker == this) mk.splice(j--, 1);
        }
        if (min != Infinity)
            changes.push({from:min, to:max + 1});
    });
    TextMarker.prototype.find = function () {
        var from, to;
        for (var i = 0, e = this.set.length; i < e; ++i) {
            var line = this.set[i], mk = line.marked;
            for (var j = 0; j < mk.length; ++j) {
                var mark = mk[j];
                if (mark.marker == this) {
                    if (mark.from != null || mark.to != null) {
                        var found = lineNo(line);
                        if (found != null) {
                            if (mark.from != null) from = {line:found, ch:mark.from};
                            if (mark.to != null) to = {line:found, ch:mark.to};
                        }
                    }
                }
            }
        }
        return {from:from, to:to};
    };

    function markText(from, to, className) {
        from = clipPos(from);
        to = clipPos(to);
        var tm = new TextMarker();
        if (!posLess(from, to)) return tm;
        function add(line, from, to, className) {
            getLine(line).addMark(new MarkedText(from, to, className, tm));
        }

        if (from.line == to.line) add(from.line, from.ch, to.ch, className);
        else {
            add(from.line, from.ch, null, className);
            for (var i = from.line + 1, e = to.line; i < e; ++i)
                add(i, null, null, className);
            add(to.line, null, to.ch, className);
        }
        changes.push({from:from.line, to:to.line + 1});
        return tm;
    }

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

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

    function addGutterMarker(line, text, className) {
        if (typeof line == "number") line = getLine(clipLine(line));
        line.gutterMarker = {text:text, style:className};
        gutterDirty = true;
        return line;
    }

    function removeGutterMarker(line) {
        if (typeof line == "number") line = getLine(clipLine(line));
        line.gutterMarker = null;
        gutterDirty = true;
    }

    function changeLine(handle, op) {
        var no = handle, line = handle;
        if (typeof handle == "number") line = getLine(clipLine(handle));
        else no = lineNo(handle);
        if (no == null) return null;
        if (op(line, no)) changes.push({from:no, to:no + 1});
        else return null;
        return line;
    }

    function setLineClass(handle, className, bgClassName) {
        return changeLine(handle, function (line) {
            if (line.className != className || line.bgClassName != bgClassName) {
                line.className = className;
                line.bgClassName = bgClassName;
                return true;
            }
        });
    }

    function setLineHidden(handle, hidden) {
        return changeLine(handle, function (line, no) {
            if (line.hidden != hidden) {
                line.hidden = hidden;
                updateLineHeight(line, hidden ? 0 : 1);
                var fline = sel.from.line, tline = sel.to.line;
                if (hidden && (fline == no || tline == no)) {
                    var from = fline == no ? skipHidden({line:fline, ch:0}, fline, 0) : sel.from;
                    var to = tline == no ? skipHidden({line:tline, ch:0}, tline, 0) : sel.to;
                    // Can't hide the last visible line, we'd have no place to put the cursor
                    if (!to) return;
                    setSelection(from, to);
                }
                return (gutterDirty = true);
            }
        });
    }

    function lineInfo(line) {
        if (typeof line == "number") {
            if (!isLine(line)) return null;
            var n = line;
            line = getLine(line);
            if (!line) return null;
        }
        else {
            var n = lineNo(line);
            if (n == null) return null;
        }
        var marker = line.gutterMarker;
        return {line:n, handle:line, text:line.text, markerText:marker && marker.text,
            markerClass:marker && marker.style, lineClass:line.className, bgClass:line.bgClassName};
    }

    function stringWidth(str) {
        measure.innerHTML = "<pre><span>x</span></pre>";
        measure.firstChild.firstChild.firstChild.nodeValue = str;
        return measure.firstChild.firstChild.offsetWidth || 10;
    }

    // These are used to go from pixel positions to character
    // positions, taking varying character widths into account.
    function charFromX(line, x) {
        if (x <= 0) return 0;
        var lineObj = getLine(line), text = lineObj.text;

        function getX(len) {
            return measureLine(lineObj, len).left;
        }

        var from = 0, fromX = 0, to = text.length, toX;
        // Guess a suitable upper bound for our search.
        var estimated = Math.min(to, Math.ceil(x / charWidth()));
        for (; ;) {
            var estX = getX(estimated);
            if (estX <= x && estimated < to) estimated = Math.min(to, Math.ceil(estimated * 1.2));
            else {
                toX = estX;
                to = estimated;
                break;
            }
        }
        if (x > toX) return to;
        // Try to guess a suitable lower bound as well.
        estimated = Math.floor(to * 0.8);
        estX = getX(estimated);
        if (estX < x) {
            from = estimated;
            fromX = estX;
        }
        // Do a binary search between these bounds.
        for (; ;) {
            if (to - from <= 1) return (toX - x > x - fromX) ? from : to;
            var middle = Math.ceil((from + to) / 2), middleX = getX(middle);
            if (middleX > x) {
                to = middle;
                toX = middleX;
            }
            else {
                from = middle;
                fromX = middleX;
            }
        }
    }

    var tempId = "CodeMirror-temp-" + Math.floor(Math.random() * 0xffffff).toString(16);

    function measureLine(line, ch) {
        if (ch == 0) return {top:0, left:0};
        var wbr = options.lineWrapping && ch < line.text.length &&
            spanAffectsWrapping.test(line.text.slice(ch - 1, ch + 1));
        measure.innerHTML = "<pre>" + line.getHTML(makeTab, ch, tempId, wbr) + "</pre>";
        var elt = document.getElementById(tempId);
        var top = elt.offsetTop, left = elt.offsetLeft;
        // Older IEs report zero offsets for spans directly after a wrap
        if (ie && top == 0 && left == 0) {
            var backup = document.createElement("span");
            backup.innerHTML = "x";
            elt.parentNode.insertBefore(backup, elt.nextSibling);
            top = backup.offsetTop;
        }
        return {top:top, left:left};
    }

    function localCoords(pos, inLineWrap) {
        var x, lh = textHeight(), y = lh * (heightAtLine(doc, pos.line) - (inLineWrap ? displayOffset : 0));
        if (pos.ch == 0) x = 0;
        else {
            var sp = measureLine(getLine(pos.line), pos.ch);
            x = sp.left;
            if (options.lineWrapping) y += Math.max(0, sp.top);
        }
        return {x:x, y:y, yBot:y + lh};
    }

    // Coords must be lineSpace-local
    function coordsChar(x, y) {
        if (y < 0) y = 0;
        var th = textHeight(), cw = charWidth(), heightPos = displayOffset + Math.floor(y / th);
        var lineNo = lineAtHeight(doc, heightPos);
        if (lineNo >= doc.size) return {line:doc.size - 1, ch:getLine(doc.size - 1).text.length};
        var lineObj = getLine(lineNo), text = lineObj.text;
        var tw = options.lineWrapping, innerOff = tw ? heightPos - heightAtLine(doc, lineNo) : 0;
        if (x <= 0 && innerOff == 0) return {line:lineNo, ch:0};
        function getX(len) {
            var sp = measureLine(lineObj, len);
            if (tw) {
                var off = Math.round(sp.top / th);
                return Math.max(0, sp.left + (off - innerOff) * scroller.clientWidth);
            }
            return sp.left;
        }

        var from = 0, fromX = 0, to = text.length, toX;
        // Guess a suitable upper bound for our search.
        var estimated = Math.min(to, Math.ceil((x + innerOff * scroller.clientWidth * .9) / cw));
        for (; ;) {
            var estX = getX(estimated);
            if (estX <= x && estimated < to) estimated = Math.min(to, Math.ceil(estimated * 1.2));
            else {
                toX = estX;
                to = estimated;
                break;
            }
        }
        if (x > toX) return {line:lineNo, ch:to};
        // Try to guess a suitable lower bound as well.
        estimated = Math.floor(to * 0.8);
        estX = getX(estimated);
        if (estX < x) {
            from = estimated;
            fromX = estX;
        }
        // Do a binary search between these bounds.
        for (; ;) {
            if (to - from <= 1) return {line:lineNo, ch:(toX - x > x - fromX) ? from : to};
            var middle = Math.ceil((from + to) / 2), middleX = getX(middle);
            if (middleX > x) {
                to = middle;
                toX = middleX;
            }
            else {
                from = middle;
                fromX = middleX;
            }
        }
    }

    function pageCoords(pos) {
        var local = localCoords(pos, true), off = eltOffset(lineSpace);
        return {x:off.left + local.x, y:off.top + local.y, yBot:off.top + local.yBot};
    }

    var cachedHeight, cachedHeightFor, measureText;

    function textHeight() {
        if (measureText == null) {
            measureText = "<pre>";
            for (var i = 0; i < 49; ++i) measureText += "x<br/>";
            measureText += "x</pre>";
        }
        var offsetHeight = lineDiv.clientHeight;
        if (offsetHeight == cachedHeightFor) return cachedHeight;
        cachedHeightFor = offsetHeight;
        measure.innerHTML = measureText;
        cachedHeight = measure.firstChild.offsetHeight / 50 || 1;
        measure.innerHTML = "";
        return cachedHeight;
    }

    var cachedWidth, cachedWidthFor = 0;

    function charWidth() {
        if (scroller.clientWidth == cachedWidthFor) return cachedWidth;
        cachedWidthFor = scroller.clientWidth;
        return (cachedWidth = stringWidth("x"));
    }

    function paddingTop() {
        return lineSpace.offsetTop;
    }

    function paddingLeft() {
        return lineSpace.offsetLeft;
    }

    function posFromMouse(e, liberal) {
        var offW = eltOffset(scroller, true), x, y;
        // Fails unpredictably on IE[67] when mouse is dragged around quickly.
        try {
            x = e.clientX;
            y = e.clientY;
        } catch (e) {
            return null;
        }
        // This is a mess of a heuristic to try and determine whether a
        // scroll-bar was clicked or not, and to return null if one was
        // (and !liberal).
        if (!liberal && (x - offW.left > scroller.clientWidth || y - offW.top > scroller.clientHeight))
            return null;
        var offL = eltOffset(lineSpace, true);
        return coordsChar(x - offL.left, y - offL.top);
    }

    function onContextMenu(e) {
        var pos = posFromMouse(e), scrollPos = scroller.scrollTop;
        if (!pos || window.opera) return; // Opera is difficult.
        if (posEq(sel.from, sel.to) || posLess(pos, sel.from) || !posLess(pos, sel.to))
            operation(setCursor)(pos.line, pos.ch);

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

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

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

    var matching = {"(":")>", ")":"(<", "[":"]>", "]":"[<", "{":"}>", "}":"{<"};

    function matchBrackets(autoclear) {
        var head = sel.inverted ? sel.from : sel.to, line = getLine(head.line), pos = head.ch - 1;
        var match = (pos >= 0 && matching[line.text.charAt(pos)]) || matching[line.text.charAt(++pos)];
        if (!match) return;
        var ch = match.charAt(0), forward = match.charAt(1) == ">", d = forward ? 1 : -1, st = line.styles;
        for (var off = pos + 1, i = 0, e = st.length; i < e; i += 2)
            if ((off -= st[i].length) <= 0) {
                var style = st[i + 1];
                break;
            }

        var stack = [line.text.charAt(pos)], re = /[(){}[\]]/;

        function scan(line, from, to) {
            if (!line.text) return;
            var st = line.styles, pos = forward ? 0 : line.text.length - 1, cur;
            for (var i = forward ? 0 : st.length - 2, e = forward ? st.length : -2; i != e; i += 2 * d) {
                var text = st[i];
                if (st[i + 1] != null && st[i + 1] != style) {
                    pos += d * text.length;
                    continue;
                }
                for (var j = forward ? 0 : text.length - 1, te = forward ? text.length : -1; j != te; j += d, pos += d) {
                    if (pos >= from && pos < to && re.test(cur = text.charAt(j))) {
                        var match = matching[cur];
                        if (match.charAt(1) == ">" == forward) stack.push(cur);
                        else if (stack.pop() != match.charAt(0)) return {pos:pos, match:false};
                        else if (!stack.length) return {pos:pos, match:true};
                    }
                }
            }
        }

        for (var i = head.line, e = forward ? Math.min(i + 100, doc.size) : Math.max(-1, i - 100); i != e; i += d) {
            var line = getLine(i), first = i == head.line;
            var found = scan(line, first && forward ? pos + 1 : 0, first && !forward ? pos : line.text.length);
            if (found) break;
        }
        if (!found) found = {pos:null, match:false};
        var style = found.match ? "CodeMirror-matchingbracket" : "CodeMirror-nonmatchingbracket";
        var one = markText({line:head.line, ch:pos}, {line:head.line, ch:pos + 1}, style),
            two = found.pos != null && markText({line:i, ch:found.pos}, {line:i, ch:found.pos + 1}, style);
        var clear = operation(function () {
            one.clear();
            two && two.clear();
        });
        if (autoclear) setTimeout(clear, 800);
        else bracketHighlighted = clear;
    }

    // Finds the line to start with when starting a parse. Tries to
    // find a line with a stateAfter, so that it can start with a
    // valid state. If that fails, it returns the line with the
    // smallest indentation, which tends to need the least context to
    // parse correctly.
    function findStartLine(n) {
        var minindent, minline;
        for (var search = n, lim = n - 40; search > lim; --search) {
            if (search == 0) return 0;
            var line = getLine(search - 1);
            if (line.stateAfter) return search;
            var indented = line.indentation(options.tabSize);
            if (minline == null || minindent > indented) {
                minline = search - 1;
                minindent = indented;
            }
        }
        return minline;
    }

    function getStateBefore(n) {
        var start = findStartLine(n), state = start && getLine(start - 1).stateAfter;
        if (!state) state = startState(mode);
        else state = copyState(mode, state);
        doc.iter(start, n, function (line) {
            line.highlight(mode, state, options.tabSize);
            line.stateAfter = copyState(mode, state);
        });
        if (start < n) changes.push({from:start, to:n});
        if (n < doc.size && !getLine(n).stateAfter) work.push(n);
        return state;
    }

    function highlightLines(start, end) {
        var state = getStateBefore(start);
        doc.iter(start, end, function (line) {
            line.highlight(mode, state, options.tabSize);
            line.stateAfter = copyState(mode, state);
        });
    }

    function highlightWorker() {
        var end = +new Date + options.workTime;
        var foundWork = work.length;
        while (work.length) {
            if (!getLine(showingFrom).stateAfter) var task = showingFrom;
            else var task = work.pop();
            if (task >= doc.size) continue;
            var start = findStartLine(task), state = start && getLine(start - 1).stateAfter;
            if (state) state = copyState(mode, state);
            else state = startState(mode);

            var unchanged = 0, compare = mode.compareStates, realChange = false,
                i = start, bail = false;
            doc.iter(i, doc.size, function (line) {
                var hadState = line.stateAfter;
                if (+new Date > end) {
                    work.push(i);
                    startWorker(options.workDelay);
                    if (realChange) changes.push({from:task, to:i + 1});
                    return (bail = true);
                }
                var changed = line.highlight(mode, state, options.tabSize);
                if (changed) realChange = true;
                line.stateAfter = copyState(mode, state);
                var done = null;
                if (compare) {
                    var same = hadState && compare(hadState, state);
                    if (same != Pass) done = !!same;
                }
                if (done == null) {
                    if (changed !== false || !hadState) unchanged = 0;
                    else if (++unchanged > 3 && (!mode.indent || mode.indent(hadState, "") == mode.indent(state, "")))
                        done = true;
                }
                if (done) return true;
                ++i;
            });
            if (bail) return;
            if (realChange) changes.push({from:task, to:i + 1});
        }
        if (foundWork && options.onHighlightComplete)
            options.onHighlightComplete(instance);
    }

    function startWorker(time) {
        if (!work.length) return;
        highlight.set(time, operation(highlightWorker));
    }

    // Operations are used to wrap changes in such a way that each
    // change won't have to update the cursor and display (which would
    // be awkward, slow, and error-prone), but instead updates are
    // batched and then all combined and executed at once.
    function startOperation() {
        updateInput = userSelChange = textChanged = null;
        changes = [];
        selectionChanged = false;
        callbacks = [];
    }

    function endOperation() {
        var reScroll = false, updated;
        if (selectionChanged) reScroll = !scrollCursorIntoView();
        if (changes.length) updated = updateDisplay(changes, true);
        else {
            if (selectionChanged) updateSelection();
            if (gutterDirty) updateGutter();
        }
        if (reScroll) scrollCursorIntoView();
        if (selectionChanged) {
            scrollEditorIntoView();
            restartBlink();
        }

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

        if (selectionChanged && options.matchBrackets)
            setTimeout(operation(function () {
                if (bracketHighlighted) {
                    bracketHighlighted();
                    bracketHighlighted = null;
                }
                if (posEq(sel.from, sel.to)) matchBrackets(false);
            }), 20);
        var tc = textChanged, cbs = callbacks; // these can be reset by callbacks
        if (selectionChanged && options.onCursorActivity)
            options.onCursorActivity(instance);
        if (tc && options.onChange && instance)
            options.onChange(instance, tc);
        for (var i = 0; i < cbs.length; ++i) cbs[i](instance);
        if (updated && options.onUpdate) options.onUpdate(instance);
    }

    var nestedOperation = 0;

    function operation(f) {
        return function () {
            if (!nestedOperation++) startOperation();
            try {
                var result = f.apply(this, arguments);
            }
            finally {
                if (!--nestedOperation) endOperation();
            }
            return result;
        };
    }

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

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

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

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

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

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

var commands = CodeMirror.commands = {
    selectAll:function (cm) {
        cm.setSelection({line:0, ch:0}, {line:cm.lineCount() - 1});
    },
    killLine:function (cm) {
        var from = cm.getCursor(true), to = cm.getCursor(false), sel = !posEq(from, to);
        if (!sel && cm.getLine(from.line).length == from.ch) cm.replaceRange("", from, {line:from.line + 1, ch:0});
        else cm.replaceRange("", from, sel ? to : {line:from.line});
    },
    deleteLine:function (cm) {
        var l = cm.getCursor().line;
        cm.replaceRange("", {line:l, ch:0}, {line:l});
    },
    undo:function (cm) {
        cm.undo();
    },
    redo:function (cm) {
        cm.redo();
    },
    goDocStart:function (cm) {
        cm.setCursor(0, 0, true);
    },
    goDocEnd:function (cm) {
        cm.setSelection({line:cm.lineCount() - 1}, null, true);
    },
    goLineStart:function (cm) {
        cm.setCursor(cm.getCursor().line, 0, true);
    },
    goLineStartSmart:function (cm) {
        var cur = cm.getCursor();
        var text = cm.getLine(cur.line), firstNonWS = Math.max(0, text.search(/\S/));
        cm.setCursor(cur.line, cur.ch <= firstNonWS && cur.ch ? 0 : firstNonWS, true);
    },
    goLineEnd:function (cm) {
        cm.setSelection({line:cm.getCursor().line}, null, true);
    },
    goLineUp:function (cm) {
        cm.moveV(-1, "line");
    },
    goLineDown:function (cm) {
        cm.moveV(1, "line");
    },
    goPageUp:function (cm) {
        cm.moveV(-1, "page");
    },
    goPageDown:function (cm) {
        cm.moveV(1, "page");
    },
    goCharLeft:function (cm) {
        cm.moveH(-1, "char");
    },
    goCharRight:function (cm) {
        cm.moveH(1, "char");
    },
    goColumnLeft:function (cm) {
        cm.moveH(-1, "column");
    },
    goColumnRight:function (cm) {
        cm.moveH(1, "column");
    },
    goWordLeft:function (cm) {
        cm.moveH(-1, "word");
    },
    goWordRight:function (cm) {
        cm.moveH(1, "word");
    },
    delCharLeft:function (cm) {
        cm.deleteH(-1, "char");
    },
    delCharRight:function (cm) {
        cm.deleteH(1, "char");
    },
    delWordLeft:function (cm) {
        cm.deleteH(-1, "word");
    },
    delWordRight:function (cm) {
        cm.deleteH(1, "word");
    },
    indentAuto:function (cm) {
        cm.indentSelection("smart");
    },
    indentMore:function (cm) {
        cm.indentSelection("add");
    },
    indentLess:function (cm) {
        cm.indentSelection("subtract");
    },
    insertTab:function (cm) {
        cm.replaceSelection("\t", "end");
    },
    defaultTab:function (cm) {
        if (cm.somethingSelected()) cm.indentSelection("add");
        else cm.replaceSelection("\t", "end");
    },
    transposeChars:function (cm) {
        var cur = cm.getCursor(), line = cm.getLine(cur.line);
        if (cur.ch > 0 && cur.ch < line.length - 1)
            cm.replaceRange(line.charAt(cur.ch) + line.charAt(cur.ch - 1),
                {line:cur.line, ch:cur.ch - 1}, {line:cur.line, ch:cur.ch + 1});
    },
    newlineAndIndent:function (cm) {
        cm.replaceSelection("\n", "end");
        cm.indentLine(cm.getCursor().line);
    },
    toggleOverwrite:function (cm) {
        cm.toggleOverwrite();
    }
};

var keyMap = CodeMirror.keyMap = {};
keyMap.basic = {
    "Left":"goCharLeft", "Right":"goCharRight", "Up":"goLineUp", "Down":"goLineDown",
    "End":"goLineEnd", "Home":"goLineStartSmart", "PageUp":"goPageUp", "PageDown":"goPageDown",
    "Delete":"delCharRight", "Backspace":"delCharLeft", "Tab":"defaultTab", "Shift-Tab":"indentAuto",
    "Enter":"newlineAndIndent", "Insert":"toggleOverwrite"
};
// Note that the save and find-related commands aren't defined by
// default. Unknown commands are simply ignored.
keyMap.pcDefault = {
    "Ctrl-A":"selectAll", "Ctrl-D":"deleteLine", "Ctrl-Z":"undo", "Shift-Ctrl-Z":"redo", "Ctrl-Y":"redo",
    "Ctrl-Home":"goDocStart", "Alt-Up":"goDocStart", "Ctrl-End":"goDocEnd", "Ctrl-Down":"goDocEnd",
    "Ctrl-Left":"goWordLeft", "Ctrl-Right":"goWordRight", "Alt-Left":"goLineStart", "Alt-Right":"goLineEnd",
    "Ctrl-Backspace":"delWordLeft", "Ctrl-Delete":"delWordRight", "Ctrl-S":"save", "Ctrl-F":"find",
    "Ctrl-G":"findNext", "Shift-Ctrl-G":"findPrev", "Shift-Ctrl-F":"replace", "Shift-Ctrl-R":"replaceAll",
    "Ctrl-[":"indentLess", "Ctrl-]":"indentMore",
    fallthrough:"basic"
};
keyMap.macDefault = {
    "Cmd-A":"selectAll", "Cmd-D":"deleteLine", "Cmd-Z":"undo", "Shift-Cmd-Z":"redo", "Cmd-Y":"redo",
    "Cmd-Up":"goDocStart", "Cmd-End":"goDocEnd", "Cmd-Down":"goDocEnd", "Alt-Left":"goWordLeft",
    "Alt-Right":"goWordRight", "Cmd-Left":"goLineStart", "Cmd-Right":"goLineEnd", "Alt-Backspace":"delWordLeft",
    "Ctrl-Alt-Backspace":"delWordRight", "Alt-Delete":"delWordRight", "Cmd-S":"save", "Cmd-F":"find",
    "Cmd-G":"findNext", "Shift-Cmd-G":"findPrev", "Cmd-Alt-F":"replace", "Shift-Cmd-Alt-F":"replaceAll",
    "Cmd-[":"indentLess", "Cmd-]":"indentMore",
    fallthrough:["basic", "emacsy"]
};
keyMap["default"] = mac ? keyMap.macDefault : keyMap.pcDefault;
keyMap.emacsy = {
    "Ctrl-F":"goCharRight", "Ctrl-B":"goCharLeft", "Ctrl-P":"goLineUp", "Ctrl-N":"goLineDown",
    "Alt-F":"goWordRight", "Alt-B":"goWordLeft", "Ctrl-A":"goLineStart", "Ctrl-E":"goLineEnd",
    "Ctrl-V":"goPageUp", "Shift-Ctrl-V":"goPageDown", "Ctrl-D":"delCharRight", "Ctrl-H":"delCharLeft",
    "Alt-D":"delWordRight", "Alt-Backspace":"delWordLeft", "Ctrl-K":"killLine", "Ctrl-T":"transposeChars"
};

function getKeyMap(val) {
    if (typeof val == "string") return keyMap[val];
    else return val;
}

function lookupKey(name, extraMap, map, handle, stop) {
    function lookup(map) {
        map = getKeyMap(map);
        var found = map[name];
        if (found != null && handle(found)) return true;
        if (map.nofallthrough) {
            if (stop) stop();
            return true;
        }
        var fallthrough = map.fallthrough;
        if (fallthrough == null) return false;
        if (Object.prototype.toString.call(fallthrough) != "[object Array]")
            return lookup(fallthrough);
        for (var i = 0, e = fallthrough.length; i < e; ++i) {
            if (lookup(fallthrough[i])) return true;
        }
        return false;
    }

    if (extraMap && lookup(extraMap)) return true;
    return lookup(map);
}

function isModifierKey(event) {
    var name = keyNames[e_prop(event, "keyCode")];
    return name == "Ctrl" || name == "Alt" || name == "Shift" || name == "Mod";
}

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

    function save() {
        textarea.value = instance.getValue();
    }

    if (textarea.form) {
        // Deplorable hack to make the submit method do the right thing.
        var rmSubmit = connect(textarea.form, "submit", save, true);
        if (typeof textarea.form.submit == "function") {
            var realSubmit = textarea.form.submit;

            function wrappedSubmit() {
                save();
                textarea.form.submit = realSubmit;
                textarea.form.submit();
                textarea.form.submit = wrappedSubmit;
            }

            textarea.form.submit = wrappedSubmit;
        }
    }

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

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

CodeMirror.copyState = copyState;
function startState(mode, a1, a2) {
    return mode.startState ? mode.startState(a1, a2) : true;
}

CodeMirror.startState = startState;

// The character stream used by a mode's parser.
function StringStream(string, tabSize) {
    this.pos = this.start = 0;
    this.string = string;
    this.tabSize = tabSize || 8;
}

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

            if (cased(this.string).indexOf(cased(pattern), this.pos) == this.pos) {
                if (consume !== false) this.pos += pattern.length;
                return true;
            }
        }
        else {
            var match = this.string.slice(this.pos).match(pattern);
            if (match && consume !== false) this.pos += match[0].length;
            return match;
        }
    },
    current:function () {
        return this.string.slice(this.start, this.pos);
    }
};
CodeMirror.StringStream = StringStream;

function MarkedText(from, to, className, marker) {
    this.from = from;
    this.to = to;
    this.style = className;
    this.marker = marker;
}

MarkedText.prototype = {
    attach:function (line) {
        this.marker.set.push(line);
    },
    detach:function (line) {
        var ix = indexOf(this.marker.set, line);
        if (ix > -1) this.marker.set.splice(ix, 1);
    },
    split:function (pos, lenBefore) {
        if (this.to <= pos && this.to != null) return null;
        var from = this.from < pos || this.from == null ? null : this.from - pos + lenBefore;
        var to = this.to == null ? null : this.to - pos + lenBefore;
        return new MarkedText(from, to, this.style, this.marker);
    },
    dup:function () {
        return new MarkedText(null, null, this.style, this.marker);
    },
    clipTo:function (fromOpen, from, toOpen, to, diff) {
        if (fromOpen && to > this.from && (to < this.to || this.to == null))
            this.from = null;
        else if (this.from != null && this.from >= from)
            this.from = Math.max(to, this.from) + diff;
        if (toOpen && (from < this.to || this.to == null) && (from > this.from || this.from == null))
            this.to = null;
        else if (this.to != null && this.to > from)
            this.to = to < this.to ? this.to + diff : from;
    },
    isDead:function () {
        return this.from != null && this.to != null && this.from >= this.to;
    },
    sameSet:function (x) {
        return this.marker == x.marker;
    }
};

function Bookmark(pos) {
    this.from = pos;
    this.to = pos;
    this.line = null;
}

Bookmark.prototype = {
    attach:function (line) {
        this.line = line;
    },
    detach:function (line) {
        if (this.line == line) this.line = null;
    },
    split:function (pos, lenBefore) {
        if (pos < this.from) {
            this.from = this.to = (this.from - pos) + lenBefore;
            return this;
        }
    },
    isDead:function () {
        return this.from > this.to;
    },
    clipTo:function (fromOpen, from, toOpen, to, diff) {
        if ((fromOpen || from < this.from) && (toOpen || to > this.to)) {
            this.from = 0;
            this.to = -1;
        } else if (this.from > from) {
            this.from = this.to = Math.max(to, this.from) + diff;
        }
    },
    sameSet:function (x) {
        return false;
    },
    find:function () {
        if (!this.line || !this.line.parent) return null;
        return {line:lineNo(this.line), ch:this.from};
    },
    clear:function () {
        if (this.line) {
            var found = indexOf(this.line.marked, this);
            if (found != -1) this.line.marked.splice(found, 1);
            this.line = null;
        }
    }
};

// Line objects. These hold state related to a line, including
// highlighting info (the styles array).
function Line(text, styles) {
    this.styles = styles || [text, null];
    this.text = text;
    this.height = 1;
    this.marked = this.gutterMarker = this.className = this.bgClassName = this.handlers = null;
    this.stateAfter = this.parent = this.hidden = null;
}

Line.inheritMarks = function (text, orig) {
    var ln = new Line(text), mk = orig && orig.marked;
    if (mk) {
        for (var i = 0; i < mk.length; ++i) {
            if (mk[i].to == null && mk[i].style) {
                var newmk = ln.marked || (ln.marked = []), mark = mk[i];
                var nmark = mark.dup();
                newmk.push(nmark);
                nmark.attach(ln);
            }
        }
    }
    return ln;
}
Line.prototype = {
    // Replace a piece of a line, keeping the styles around it intact.
    replace:function (from, to_, text) {
        var st = [], mk = this.marked, to = to_ == null ? this.text.length : to_;
        copyStyles(0, from, this.styles, st);
        if (text) st.push(text, null);
        copyStyles(to, this.text.length, this.styles, st);
        this.styles = st;
        this.text = this.text.slice(0, from) + text + this.text.slice(to);
        this.stateAfter = null;
        if (mk) {
            var diff = text.length - (to - from);
            for (var i = 0; i < mk.length; ++i) {
                var mark = mk[i];
                mark.clipTo(from == null, from || 0, to_ == null, to, diff);
                if (mark.isDead()) {
                    mark.detach(this);
                    mk.splice(i--, 1);
                }
            }
        }
    },
    // Split a part off a line, keeping styles and markers intact.
    split:function (pos, textBefore) {
        var st = [textBefore, null], mk = this.marked;
        copyStyles(pos, this.text.length, this.styles, st);
        var taken = new Line(textBefore + this.text.slice(pos), st);
        if (mk) {
            for (var i = 0; i < mk.length; ++i) {
                var mark = mk[i];
                var newmark = mark.split(pos, textBefore.length);
                if (newmark) {
                    if (!taken.marked) taken.marked = [];
                    taken.marked.push(newmark);
                    newmark.attach(taken);
                    if (newmark == mark) mk.splice(i--, 1);
                }
            }
        }
        return taken;
    },
    append:function (line) {
        var mylen = this.text.length, mk = line.marked, mymk = this.marked;
        this.text += line.text;
        copyStyles(0, line.text.length, line.styles, this.styles);
        if (mymk) {
            for (var i = 0; i < mymk.length; ++i)
                if (mymk[i].to == null) mymk[i].to = mylen;
        }
        if (mk && mk.length) {
            if (!mymk) this.marked = mymk = [];
            outer: for (var i = 0; i < mk.length; ++i) {
                var mark = mk[i];
                if (!mark.from) {
                    for (var j = 0; j < mymk.length; ++j) {
                        var mymark = mymk[j];
                        if (mymark.to == mylen && mymark.sameSet(mark)) {
                            mymark.to = mark.to == null ? null : mark.to + mylen;
                            if (mymark.isDead()) {
                                mymark.detach(this);
                                mk.splice(i--, 1);
                            }
                            continue outer;
                        }
                    }
                }
                mymk.push(mark);
                mark.attach(this);
                mark.from += mylen;
                if (mark.to != null) mark.to += mylen;
            }
        }
    },
    fixMarkEnds:function (other) {
        var mk = this.marked, omk = other.marked;
        if (!mk) return;
        for (var i = 0; i < mk.length; ++i) {
            var mark = mk[i], close = mark.to == null;
            if (close && omk) {
                for (var j = 0; j < omk.length; ++j)
                    if (omk[j].sameSet(mark)) {
                        close = false;
                        break;
                    }
            }
            if (close) mark.to = this.text.length;
        }
    },
    fixMarkStarts:function () {
        var mk = this.marked;
        if (!mk) return;
        for (var i = 0; i < mk.length; ++i)
            if (mk[i].from == null) mk[i].from = 0;
    },
    addMark:function (mark) {
        mark.attach(this);
        if (this.marked == null) this.marked = [];
        this.marked.push(mark);
        this.marked.sort(function (a, b) {
            return (a.from || 0) - (b.from || 0);
        });
    },
    // Run the given mode's parser over a line, update the styles
    // array, which contains alternating fragments of text and CSS
    // classes.
    highlight:function (mode, state, tabSize) {
        var stream = new StringStream(this.text, tabSize), st = this.styles, pos = 0;
        var changed = false, curWord = st[0], prevWord;
        if (this.text == "" && mode.blankLine) mode.blankLine(state);
        while (!stream.eol()) {
            var style = mode.token(stream, state);
            var substr = this.text.slice(stream.start, stream.pos);
            stream.start = stream.pos;
            if (pos && st[pos - 1] == style)
                st[pos - 2] += substr;
            else if (substr) {
                if (!changed && (st[pos + 1] != style || (pos && st[pos - 2] != prevWord))) changed = true;
                st[pos++] = substr;
                st[pos++] = style;
                prevWord = curWord;
                curWord = st[pos];
            }
            // Give up when line is ridiculously long
            if (stream.pos > 5000) {
                st[pos++] = this.text.slice(stream.pos);
                st[pos++] = null;
                break;
            }
        }
        if (st.length != pos) {
            st.length = pos;
            changed = true;
        }
        if (pos && st[pos - 2] != prevWord) changed = true;
        // Short lines with simple highlights return null, and are
        // counted as changed by the driver because they are likely to
        // highlight the same way in various contexts.
        return changed || (st.length < 5 && this.text.length < 10 ? null : false);
    },
    // Fetch the parser token for a given character. Useful for hacks
    // that want to inspect the mode state (say, for completion).
    getTokenAt:function (mode, state, ch) {
        var txt = this.text, stream = new StringStream(txt);
        while (stream.pos < ch && !stream.eol()) {
            stream.start = stream.pos;
            var style = mode.token(stream, state);
        }
        return {start:stream.start,
            end:stream.pos,
            string:stream.current(),
            className:style || null,
            state:state};
    },
    indentation:function (tabSize) {
        return countColumn(this.text, null, tabSize);
    },
    // Produces an HTML fragment for the line, taking selection,
    // marking, and highlighting into account.
    getHTML:function (makeTab, wrapAt, wrapId, wrapWBR) {
        var html = [], first = true, col = 0;

        function span_(text, style) {
            if (!text) return;
            // Work around a bug where, in some compat modes, IE ignores leading spaces
            if (first && ie && text.charAt(0) == " ") text = "\u00a0" + text.slice(1);
            first = false;
            if (text.indexOf("\t") == -1) {
                col += text.length;
                var escaped = htmlEscape(text);
            } else {
                var escaped = "";
                for (var pos = 0; ;) {
                    var idx = text.indexOf("\t", pos);
                    if (idx == -1) {
                        escaped += htmlEscape(text.slice(pos));
                        col += text.length - pos;
                        break;
                    } else {
                        col += idx - pos;
                        var tab = makeTab(col);
                        escaped += htmlEscape(text.slice(pos, idx)) + tab.html;
                        col += tab.width;
                        pos = idx + 1;
                    }
                }
            }
            if (style) html.push('<span class="', style, '">', escaped, "</span>");
            else html.push(escaped);
        }

        var span = span_;
        if (wrapAt != null) {
            var outPos = 0, open = "<span id=\"" + wrapId + "\">";
            span = function (text, style) {
                var l = text.length;
                if (wrapAt >= outPos && wrapAt < outPos + l) {
                    if (wrapAt > outPos) {
                        span_(text.slice(0, wrapAt - outPos), style);
                        // See comment at the definition of spanAffectsWrapping
                        if (wrapWBR) html.push("<wbr>");
                    }
                    html.push(open);
                    span_(text.slice(wrapAt - outPos), style);
                    html.push("</span>");
                    wrapAt--;
                    outPos += l;
                } else {
                    outPos += l;
                    span_(text, style);
                    // Output empty wrapper when at end of line
                    if (outPos == wrapAt && outPos == len) html.push(open + "</span>");
                    // Stop outputting HTML when gone sufficiently far beyond measure
                    else if (outPos > wrapAt + 10 && /\s/.test(text)) span = function () {
                    };
                }
            }
        }

        var st = this.styles, allText = this.text, marked = this.marked;
        var len = allText.length;

        function styleToClass(style) {
            if (!style) return null;
            return "cm-" + style.replace(/ +/g, " cm-");
        }

        if (!allText && wrapAt == null) {
            span(" ");
        } else if (!marked || !marked.length) {
            for (var i = 0, ch = 0; ch < len; i += 2) {
                var str = st[i], style = st[i + 1], l = str.length;
                if (ch + l > len) str = str.slice(0, len - ch);
                ch += l;
                span(str, styleToClass(style));
            }
        } else {
            var pos = 0, i = 0, text = "", style, sg = 0;
            var nextChange = marked[0].from || 0, marks = [], markpos = 0;

            function advanceMarks() {
                var m;
                while (markpos < marked.length &&
                    ((m = marked[markpos]).from == pos || m.from == null)) {
                    if (m.style != null) marks.push(m);
                    ++markpos;
                }
                nextChange = markpos < marked.length ? marked[markpos].from : Infinity;
                for (var i = 0; i < marks.length; ++i) {
                    var to = marks[i].to || Infinity;
                    if (to == pos) marks.splice(i--, 1);
                    else nextChange = Math.min(to, nextChange);
                }
            }

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

// Data structure that holds the sequence of lines.
function LeafChunk(lines) {
    this.lines = lines;
    this.parent = null;
    for (var i = 0, e = lines.length, height = 0; i < e; ++i) {
        lines[i].parent = this;
        height += lines[i].height;
    }
    this.height = height;
}

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

BranchChunk.prototype = {
    chunkSize:function () {
        return this.size;
    },
    remove:function (at, n, callbacks) {
        this.size -= n;
        for (var i = 0; i < this.children.length; ++i) {
            var child = this.children[i], sz = child.chunkSize();
            if (at < sz) {
                var rm = Math.min(n, sz - at), oldHeight = child.height;
                child.remove(at, rm, callbacks);
                this.height -= oldHeight - child.height;
                if (sz == rm) {
                    this.children.splice(i--, 1);
                    child.parent = null;
                }
                if ((n -= rm) == 0) break;
                at = 0;
            } else at -= sz;
        }
        if (this.size - n < 25) {
            var lines = [];
            this.collapse(lines);
            this.children = [new LeafChunk(lines)];
            this.children[0].parent = this;
        }
    },
    collapse:function (lines) {
        for (var i = 0, e = this.children.length; i < e; ++i) this.children[i].collapse(lines);
    },
    insert:function (at, lines) {
        var height = 0;
        for (var i = 0, e = lines.length; i < e; ++i) height += lines[i].height;
        this.insertHeight(at, lines, height);
    },
    insertHeight:function (at, lines, height) {
        this.size += lines.length;
        this.height += height;
        for (var i = 0, e = this.children.length; i < e; ++i) {
            var child = this.children[i], sz = child.chunkSize();
            if (at <= sz) {
                child.insertHeight(at, lines, height);
                if (child.lines && child.lines.length > 50) {
                    while (child.lines.length > 50) {
                        var spilled = child.lines.splice(child.lines.length - 25, 25);
                        var newleaf = new LeafChunk(spilled);
                        child.height -= newleaf.height;
                        this.children.splice(i + 1, 0, newleaf);
                        newleaf.parent = this;
                    }
                    this.maybeSpill();
                }
                break;
            }
            at -= sz;
        }
    },
    maybeSpill:function () {
        if (this.children.length <= 10) return;
        var me = this;
        do {
            var spilled = me.children.splice(me.children.length - 5, 5);
            var sibling = new BranchChunk(spilled);
            if (!me.parent) { // Become the parent node
                var copy = new BranchChunk(me.children);
                copy.parent = me;
                me.children = [copy, sibling];
                me = copy;
            } else {
                me.size -= sibling.size;
                me.height -= sibling.height;
                var myIndex = indexOf(me.parent.children, me);
                me.parent.children.splice(myIndex + 1, 0, sibling);
            }
            sibling.parent = me.parent;
        } while (me.children.length > 10);
        me.parent.maybeSpill();
    },
    iter:function (from, to, op) {
        this.iterN(from, to - from, op);
    },
    iterN:function (at, n, op) {
        for (var i = 0, e = this.children.length; i < e; ++i) {
            var child = this.children[i], sz = child.chunkSize();
            if (at < sz) {
                var used = Math.min(n, sz - at);
                if (child.iterN(at, used, op)) return true;
                if ((n -= used) == 0) break;
                at = 0;
            } else at -= sz;
        }
    }
};

function getLineAt(chunk, n) {
    while (!chunk.lines) {
        for (var i = 0; ; ++i) {
            var child = chunk.children[i], sz = child.chunkSize();
            if (n < sz) {
                chunk = child;
                break;
            }
            n -= sz;
        }
    }
    return chunk.lines[n];
}

function lineNo(line) {
    if (line.parent == null) return null;
    var cur = line.parent, no = indexOf(cur.lines, line);
    for (var chunk = cur.parent; chunk; cur = chunk, chunk = chunk.parent) {
        for (var i = 0, e = chunk.children.length; ; ++i) {
            if (chunk.children[i] == cur) break;
            no += chunk.children[i].chunkSize();
        }
    }
    return no;
}

function lineAtHeight(chunk, h) {
    var n = 0;
    outer: do {
        for (var i = 0, e = chunk.children.length; i < e; ++i) {
            var child = chunk.children[i], ch = child.height;
            if (h < ch) {
                chunk = child;
                continue outer;
            }
            h -= ch;
            n += child.chunkSize();
        }
        return n;
    } while (!chunk.lines);
    for (var i = 0, e = chunk.lines.length; i < e; ++i) {
        var line = chunk.lines[i], lh = line.height;
        if (h < lh) break;
        h -= lh;
    }
    return n + i;
}

function heightAtLine(chunk, n) {
    var h = 0;
    outer: do {
        for (var i = 0, e = chunk.children.length; i < e; ++i) {
            var child = chunk.children[i], sz = child.chunkSize();
            if (n < sz) {
                chunk = child;
                continue outer;
            }
            n -= sz;
            h += child.height;
        }
        return h;
    } while (!chunk.lines);
    for (var i = 0; i < n; ++i) h += chunk.lines[i].height;
    return h;
}

// The history object 'chunks' changes that are made close together
// and at almost the same time into bigger undoable units.
function History() {
    this.time = 0;
    this.done = [];
    this.undone = [];
    this.compound = 0;
    this.closed = false;
}

History.prototype = {
    addChange:function (start, added, old) {
        this.undone.length = 0;
        var time = +new Date, cur = this.done[this.done.length - 1], last = cur && cur[cur.length - 1];
        var dtime = time - this.time;

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

function stopMethod() {
    e_stop(this);
}

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

function e_preventDefault(e) {
    if (e.preventDefault) e.preventDefault();
    else e.returnValue = false;
}

function e_stopPropagation(e) {
    if (e.stopPropagation) e.stopPropagation();
    else e.cancelBubble = true;
}

function e_stop(e) {
    e_preventDefault(e);
    e_stopPropagation(e);
}

CodeMirror.e_stop = e_stop;
CodeMirror.e_preventDefault = e_preventDefault;
CodeMirror.e_stopPropagation = e_stopPropagation;

function e_target(e) {
    return e.target || e.srcElement;
}

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

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

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

CodeMirror.connect = connect;

function Delayed() {
    this.id = null;
}

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

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

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

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

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

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

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

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

// Find the position of an element by following the offsetParent chain.
// If screen==true, it returns screen (rather than page) coordinates.
function eltOffset(node, screen) {
    var bod = node.ownerDocument.body;
    var x = 0, y = 0, skipBody = false;
    for (var n = node; n; n = n.offsetParent) {
        var ol = n.offsetLeft, ot = n.offsetTop;
        // Firefox reports weird inverted offsets when the body has a border.
        if (n == bod) {
            x += Math.abs(ol);
            y += Math.abs(ot);
        }
        else {
            x += ol, y += ot;
        }
        if (screen && computedStyle(n).position == "fixed")
            skipBody = true;
    }
    var e = screen && !skipBody ? null : bod;
    for (var n = node.parentNode; n != e; n = n.parentNode)
        if (n.scrollLeft != null) {
            x -= n.scrollLeft;
            y -= n.scrollTop;
        }
    return {left:x, top:y};
}

// Use the faster and saner getBoundingClientRect method when possible.
if (document.documentElement.getBoundingClientRect != null) eltOffset = function (node, screen) {
    // Take the parts of bounding client rect that we are interested in so we are able to edit if need be,
    // since the returned value cannot be changed externally (they are kept in sync as the element moves within the page)
    try {
        var box = node.getBoundingClientRect();
        box = { top:box.top, left:box.left };
    }
    catch (e) {
        box = {top:0, left:0};
    }
    if (!screen) {
        // Get the toplevel scroll, working around browser differences.
        if (window.pageYOffset == null) {
            var t = document.documentElement || document.body.parentNode;
            if (t.scrollTop == null) t = document.body;
            box.top += t.scrollTop;
            box.left += t.scrollLeft;
        } else {
            box.top += window.pageYOffset;
            box.left += window.pageXOffset;
        }
    }
    return box;
};

// Get a node's text content.
function eltText(node) {
    return node.textContent || node.innerText || node.nodeValue || "";
}

function selectInput(node) {
    if (ios) { // Mobile Safari apparently has a bug where select() is broken.
        node.selectionStart = 0;
        node.selectionEnd = node.value.length;
    } else node.select();
}

// Operations on {line, ch} objects.
function posEq(a, b) {
    return a.line == b.line && a.ch == b.ch;
}

function posLess(a, b) {
    return a.line < b.line || (a.line == b.line && a.ch < b.ch);
}

function copyPos(x) {
    return {line:x.line, ch:x.ch};
}

var escapeElement = document.createElement("pre");

function htmlEscape(str) {
    escapeElement.textContent = str;
    return escapeElement.innerHTML;
}

// Recent (late 2011) Opera betas insert bogus newlines at the start
// of the textContent, so we strip those.
if (htmlEscape("a") == "\na")
    htmlEscape = function (str) {
        escapeElement.textContent = str;
        return escapeElement.innerHTML.slice(1);
    };
// Some IEs don't preserve tabs through innerHTML
else if (htmlEscape("\t") != "\t")
    htmlEscape = function (str) {
        escapeElement.innerHTML = "";
        escapeElement.appendChild(document.createTextNode(str));
        return escapeElement.innerHTML;
    };
CodeMirror.htmlEscape = htmlEscape;

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

function indexOf(collection, elt) {
    if (collection.indexOf) return collection.indexOf(elt);
    for (var i = 0, e = collection.length; i < e; ++i)
        if (collection[i] == elt) return i;
    return -1;
}

function isWordChar(ch) {
    return /\w/.test(ch) || ch.toUpperCase() != ch.toLowerCase();
}

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

var hasSelection = window.getSelection ? function (te) {
    try {
        return te.selectionStart != te.selectionEnd;
    }
    catch (e) {
        return false;
    }
} : function (te) {
    try {
        var range = te.ownerDocument.selection.createRange();
    }
    catch (e) {
    }
    if (!range || range.parentElement() != te) return false;
    return range.compareEndPoints("StartToEnd", range) != 0;
};

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

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

return CodeMirror;

})();