/* CodeMirror main module
 *
 * Implements the CodeMirror constructor and prototype, which take care
 * of initializing the editor frame, and providing the outside interface.
 */

// The CodeMirrorConfig object is used to specify a default
// configuration. If you specify such an object before loading this
// file, the values you put into it will override the defaults given
// below. You can also assign to it after loading.
var CodeMirrorConfig = window.CodeMirrorConfig || {};

var CodeMirror = (function () {
    function setDefaults(object, defaults) {
        for (var option in defaults) {
            if (!object.hasOwnProperty(option))
                object[option] = defaults[option];
        }
    }

    function forEach(array, action) {
        for (var i = 0; i < array.length; i++)
            action(array[i]);
    }

    // These default options can be overridden by passing a set of
    // options to a specific CodeMirror constructor. See manual.html for
    // their meaning.
    setDefaults(CodeMirrorConfig, {
        stylesheet: "",
        path: "",
        parserfile: [],
        basefiles: ["util.js", "stringstream.js", "select.js", "undo.js", "editor.js", "tokenize.js"],
        iframeClass: null,
        passDelay: 200,
        passTime: 50,
        lineNumberDelay: 200,
        lineNumberTime: 50,
        continuousScanning: false,
        saveFunction: null,
        onChange: null,
        undoDepth: 50,
        undoDelay: 800,
        disableSpellcheck: true,
        textWrapping: true,
        readOnly: false,
        width: "",
        height: "300px",
        autoMatchParens: false,
        parserConfig: null,
        tabMode: "indent", // or "spaces", "default", "shift"
        reindentOnLoad: false,
        activeTokens: null,
        cursorActivity: null,
        lineNumbers: false,
        indentUnit: 2
    });

    function addLineNumberDiv(container) {
        var nums = document.createElement("DIV"),
            scroller = document.createElement("DIV");
        nums.style.position = "absolute";
        nums.style.height = "100%";
        if (nums.style.setExpression) {
            try {
                nums.style.setExpression("height", "this.previousSibling.offsetHeight + 'px'");
            }
            catch (e) {
            } // Seems to throw 'Not Implemented' on some IE8 versions
        }
        nums.style.top = "0px";
        nums.style.overflow = "hidden";
        container.appendChild(nums);
        scroller.className = "CodeMirror-line-numbers";
        nums.appendChild(scroller);
        return nums;
    }

    function CodeMirror(place, options) {
        // Backward compatibility for deprecated options.
        if (options.dumbTabs) options.tabMode = "spaces";
        else if (options.normalTab) options.tabMode = "default";

        // Use passed options, if any, to override defaults.
        this.options = options = options || {};
        setDefaults(options, CodeMirrorConfig);

        var frame = this.frame = document.createElement("IFRAME");
        if (options.iframeClass) frame.className = options.iframeClass;
        frame.frameBorder = 0;
        frame.src = "javascript:false;";
        frame.style.border = "0";
        frame.style.width = '100%';
        frame.style.height = '100%';
        // display: block occasionally suppresses some Firefox bugs, so we
        // always add it, redundant as it sounds.
        frame.style.display = "block";

        var div = this.wrapping = document.createElement("DIV");
        div.style.position = "relative";
        div.className = "CodeMirror-wrapping";
        div.style.width = options.width;
        div.style.height = options.height;

        if (place.appendChild) place.appendChild(div);
        else place(div);
        div.appendChild(frame);
        if (options.lineNumbers) this.lineNumbers = addLineNumberDiv(div);

        // Link back to this object, so that the editor can fetch options
        // and add a reference to itself.
        frame.CodeMirror = this;
        this.win = frame.contentWindow;

        if (typeof options.parserfile == "string")
            options.parserfile = [options.parserfile];
        if (typeof options.stylesheet == "string")
            options.stylesheet = [options.stylesheet];

        var html = ["<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.0 Transitional//EN\" \"http://www.w3.org/TR/html4/loose.dtd\"><html><head>"];
        // Hack to work around a bunch of IE8-specific problems.
        html.push("<meta http-equiv=\"X-UA-Compatible\" content=\"IE=EmulateIE7\"/>");
        forEach(options.stylesheet, function (file) {
            html.push("<link rel=\"stylesheet\" type=\"text/css\" href=\"" + file + "\"/>");
        });
        forEach(options.basefiles.concat(options.parserfile), function (file) {
            html.push("<script type=\"text/javascript\" src=\"" + options.path + file + "\"><" + "/script>");
        });
        html.push("</head><body style=\"border-width: 0;\" class=\"editbox\" spellcheck=\"" +
            (options.disableSpellcheck ? "false" : "true") + "\"></body></html>");

        var doc = this.win.document;
        doc.open();
        doc.write(html.join(""));
        doc.close();
    }

    CodeMirror.prototype = {
        init: function () {
            if (this.options.initCallback) this.options.initCallback(this);
            if (this.options.lineNumbers) this.activateLineNumbers();
            if (this.options.reindentOnLoad) this.reindent();
        },

        getCode: function () {
            return this.editor.getCode();
        },
        setCode: function (code) {
            this.editor.importCode(code);
        },
        selection: function () {
            this.focusIfIE();
            return this.editor.selectedText();
        },
        reindent: function () {
            this.editor.reindent();
        },
        reindentSelection: function () {
            this.focusIfIE();
            this.editor.reindentSelection(null);
        },

        focusIfIE: function () {
            // in IE, a lot of selection-related functionality only works when the frame is focused
            if (this.win.select.ie_selection) this.focus();
        },
        focus: function () {
            this.win.focus();
            if (this.editor.selectionSnapshot) // IE hack
                this.win.select.setBookmark(this.win.document.body, this.editor.selectionSnapshot);
        },
        replaceSelection: function (text) {
            this.focus();
            this.editor.replaceSelection(text);
            return true;
        },
        replaceChars: function (text, start, end) {
            this.editor.replaceChars(text, start, end);
        },
        getSearchCursor: function (string, fromCursor, caseFold) {
            return this.editor.getSearchCursor(string, fromCursor, caseFold);
        },

        undo: function () {
            this.editor.history.undo();
        },
        redo: function () {
            this.editor.history.redo();
        },
        historySize: function () {
            return this.editor.history.historySize();
        },
        clearHistory: function () {
            this.editor.history.clear();
        },

        grabKeys: function (callback, filter) {
            this.editor.grabKeys(callback, filter);
        },
        ungrabKeys: function () {
            this.editor.ungrabKeys();
        },

        setParser: function (name) {
            this.editor.setParser(name);
        },
        setSpellcheck: function (on) {
            this.win.document.body.spellcheck = on;
        },
        setTextWrapping: function (on) {
            if (on == this.options.textWrapping) return;
            this.win.document.body.style.whiteSpace = on ? "" : "nowrap";
            this.options.textWrapping = on;
            if (this.lineNumbers) {
                this.setLineNumbers(false);
                this.setLineNumbers(true);
            }
        },
        setIndentUnit: function (unit) {
            this.win.indentUnit = unit;
        },
        setUndoDepth: function (depth) {
            this.editor.history.maxDepth = depth;
        },
        setTabMode: function (mode) {
            this.options.tabMode = mode;
        },
        setLineNumbers: function (on) {
            if (on && !this.lineNumbers) {
                this.lineNumbers = addLineNumberDiv(this.wrapping);
                this.activateLineNumbers();
            }
            else if (!on && this.lineNumbers) {
                this.wrapping.removeChild(this.lineNumbers);
                this.wrapping.style.marginLeft = "";
                this.lineNumbers = null;
            }
        },

        cursorPosition: function (start) {
            this.focusIfIE();
            return this.editor.cursorPosition(start);
        },
        firstLine: function () {
            return this.editor.firstLine();
        },
        lastLine: function () {
            return this.editor.lastLine();
        },
        nextLine: function (line) {
            return this.editor.nextLine(line);
        },
        prevLine: function (line) {
            return this.editor.prevLine(line);
        },
        lineContent: function (line) {
            return this.editor.lineContent(line);
        },
        setLineContent: function (line, content) {
            this.editor.setLineContent(line, content);
        },
        removeLine: function (line) {
            this.editor.removeLine(line);
        },
        insertIntoLine: function (line, position, content) {
            this.editor.insertIntoLine(line, position, content);
        },
        selectLines: function (startLine, startOffset, endLine, endOffset) {
            this.win.focus();
            this.editor.selectLines(startLine, startOffset, endLine, endOffset);
        },
        nthLine: function (n) {
            var line = this.firstLine();
            for (; n > 1 && line !== false; n--)
                line = this.nextLine(line);
            return line;
        },
        lineNumber: function (line) {
            var num = 0;
            while (line !== false) {
                num++;
                line = this.prevLine(line);
            }
            return num;
        },

        // Old number-based line interface
        jumpToLine: function (n) {
            this.selectLines(this.nthLine(n), 0);
            this.win.focus();
        },
        currentLine: function () {
            return this.lineNumber(this.cursorPosition().line);
        },

        activateLineNumbers: function () {
            var frame = this.frame, win = frame.contentWindow, doc = win.document, body = doc.body,
                nums = this.lineNumbers, scroller = nums.firstChild, self = this;
            var barWidth = null;

            function sizeBar() {
                if (frame.offsetWidth == 0) return;
                for (var root = frame; root.parentNode; root = root.parentNode);
                if (!nums.parentNode || root != document || !win.Editor) {
                    // Clear event handlers (their nodes might already be collected, so try/catch)
                    try {
                        clear();
                    } catch (e) {
                    }
                    clearInterval(sizeInterval);
                    return;
                }

                if (nums.offsetWidth != barWidth) {
                    barWidth = nums.offsetWidth;
                    nums.style.left = "-" + (frame.parentNode.style.marginLeft = barWidth + "px");
                }
            }

            function doScroll() {
                nums.scrollTop = body.scrollTop || doc.documentElement.scrollTop || 0;
            }

            // Cleanup function, registered by nonWrapping and wrapping.
            var clear = function () {
            };
            sizeBar();
            var sizeInterval = setInterval(sizeBar, 500);

            function nonWrapping() {
                var nextNum = 1;

                function update() {
                    var target = 50 + Math.max(body.offsetHeight, frame.offsetHeight);
                    while (scroller.offsetHeight < target) {
                        scroller.appendChild(document.createElement("DIV"));
                        scroller.lastChild.innerHTML = nextNum++;
                    }
                    doScroll();
                }

                var onScroll = win.addEventHandler(win, "scroll", update, true),
                    onResize = win.addEventHandler(win, "resize", update, true);
                clear = function () {
                    onScroll();
                    onResize();
                };
            }

            function wrapping() {
                var node, lineNum, next, pos;

                function addNum(n) {
                    if (!lineNum) lineNum = scroller.appendChild(document.createElement("DIV"));
                    lineNum.innerHTML = n;
                    pos = lineNum.offsetHeight + lineNum.offsetTop;
                    lineNum = lineNum.nextSibling;
                }

                function work() {
                    if (!scroller.parentNode || scroller.parentNode != self.lineNumbers) return;

                    var endTime = new Date().getTime() + self.options.lineNumberTime;
                    while (node) {
                        addNum(next++);
                        for (; node && !win.isBR(node); node = node.nextSibling) {
                            var bott = node.offsetTop + node.offsetHeight;
                            while (bott - 3 > pos) addNum("&nbsp;");
                        }
                        if (node) node = node.nextSibling;
                        if (new Date().getTime() > endTime) {
                            pending = setTimeout(work, self.options.lineNumberDelay);
                            return;
                        }
                    }
                    // While there are un-processed number DIVs, or the scroller is smaller than the frame...
                    var target = 50 + Math.max(body.offsetHeight, frame.offsetHeight);
                    while (lineNum || scroller.offsetHeight < target) addNum(next++);
                    doScroll();
                }

                function start() {
                    doScroll();
                    node = body.firstChild;
                    lineNum = scroller.firstChild;
                    pos = 0;
                    next = 1;
                    work();
                }

                start();
                var pending = null;

                function update() {
                    if (pending) clearTimeout(pending);
                    if (self.editor.allClean()) start();
                    else pending = setTimeout(update, 200);
                }

                self.updateNumbers = update;
                var onScroll = win.addEventHandler(win, "scroll", doScroll, true),
                    onResize = win.addEventHandler(win, "resize", update, true);
                clear = function () {
                    if (pending) clearTimeout(pending);
                    if (self.updateNumbers == update) self.updateNumbers = null;
                    onScroll();
                    onResize();
                };
            }

            (this.options.textWrapping ? wrapping : nonWrapping)();
        }
    };

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

    CodeMirror.replace = function (element) {
        if (typeof element == "string")
            element = document.getElementById(element);
        return function (newElement) {
            element.parentNode.replaceChild(newElement, element);
        };
    };

    CodeMirror.fromTextArea = function (area, options) {
        if (typeof area == "string")
            area = document.getElementById(area);

        options = options || {};
        if (area.style.width && options.width == null)
            options.width = area.style.width;
        if (area.style.height && options.height == null)
            options.height = area.style.height;
        if (options.content == null) options.content = area.value;

        if (area.form) {
            function updateField() {
                area.value = mirror.getCode();
            }

            if (typeof area.form.addEventListener == "function")
                area.form.addEventListener("submit", updateField, false);
            else
                area.form.attachEvent("onsubmit", updateField);
        }

        function insert(frame) {
            if (area.nextSibling)
                area.parentNode.insertBefore(frame, area.nextSibling);
            else
                area.parentNode.appendChild(frame);
        }

        area.style.display = "none";
        var mirror = new CodeMirror(insert, options);
        return mirror;
    };

    CodeMirror.isProbablySupported = function () {
        // This is rather awful, but can be useful.
        var match;
        if (window.opera)
            return Number(window.opera.version()) >= 9.52;
        else if (/Apple Computers, Inc/.test(navigator.vendor) && (match = navigator.userAgent.match(/Version\/(\d+(?:\.\d+)?)\./)))
            return Number(match[1]) >= 3;
        else if (document.selection && window.ActiveXObject && (match = navigator.userAgent.match(/MSIE (\d+(?:\.\d*)?)\b/)))
            return Number(match[1]) >= 6;
        else if (match = navigator.userAgent.match(/gecko\/(\d{8})/i))
            return Number(match[1]) >= 20050901;
        else if (match = navigator.userAgent.match(/AppleWebKit\/(\d+)/))
            return Number(match[1]) >= 525;
        else
            return null;
    };

    return CodeMirror;
})();
