/******************************************************************************
Crossday Discuz! Board - Editor Modules for Discuz!
Copyright 2001-2006 Comsenz Inc. (http://www.comsenz.com)
*******************************************************************************/

var editbox = editwin = editdoc = null;
var cursor = -1;
var stack = new Array();

function newEditor(mode, initialtext) {

    wysiwyg = parseInt(mode);
    if (!(is_ie || is_moz || (is_opera && opera.version() >= 9))) {
        allowswitcheditor = wysiwyg = 0;
    }

    if (!allowswitcheditor) {
        $(editorid + '_switcher').style.display = 'none';
    }
    if ($(editorid + '_cmd_table'))
        $(editorid + '_cmd_table').style.display = wysiwyg ? '' : 'none';

    if (wysiwyg) {
        if ($(editorid + '_iframe')) {
            editbox = $(editorid + '_iframe');
        } else {
            var iframe = document.createElement('iframe');
            editbox = textobj.parentNode.appendChild(iframe);
            editbox.id = editorid + '_iframe';
        }

        editwin = editbox.contentWindow;
        editdoc = editwin.document;
        writeEditorContents(isUndefined(initialtext) ? textobj.value : initialtext);
    } else {
        editbox = textobj;
        editwin = textobj;
        editdoc = textobj;
        if (!isUndefined(initialtext)) {
            writeEditorContents(initialtext);
        }
        addSnapshot(textobj.value);
    }
    setEditorEvents();
}


function writeEditorContents(text) {
    if (wysiwyg) {
        if (text == '' && is_moz) {
            text = '<br />';
        }
        if (editdoc && editdoc.initialized) {
            editdoc.body.innerHTML = text;
        } else {
            editdoc.designMode = 'on';
            editdoc = editwin.document;
            editdoc.open('text/html', 'replace');
            editdoc.write(text);
            editdoc.close();
            editdoc.body.contentEditable = true;
            editdoc.initialized = true;
        }
    } else {
        textobj.value = text;
    }

    setEditorStyle();

}

function getEditorContents() {
    return wysiwyg ? editdoc.body.innerHTML : editdoc.value;
}

function setEditorStyle() {
    if (wysiwyg) {
        textobj.style.display = 'none';
        editbox.style.display = '';

        if (is_moz || is_opera) {
            for (var ss = 0; ss < document.styleSheets.length; ss++) {
                if (document.styleSheets[ss].cssRules.length <= 0) {
                    continue;
                }
                for (var i = 0; i < document.styleSheets[ss].cssRules.length; i++) {
                    if (document.styleSheets[ss].cssRules[i].selectorText == '.wysiwyg') {
                        var newss = editdoc.createElement('style');
                        newss.type = 'text/css';
                        newss.innerHTML = document.styleSheets[ss].cssRules[i].cssText + ' p { margin: 0px; }';
                        editdoc.documentElement.childNodes[0].appendChild(newss);
                        editdoc.body.style.fontSize = document.styleSheets[ss].cssRules[i].style.fontSize;
                        editdoc.body.style.fontFamily = document.styleSheets[ss].cssRules[i].style.fontFamily;
                    }
                }
            }
            editbox.style.border = '0px';
        } else if (is_ie) {
            if (document.styleSheets['css']) {
                editdoc.createStyleSheet().cssText = document.styleSheets['css'].cssText + ' p { margin: 0px; }';
                editdoc.body.className = 'wysiwyg';
            }
            editdoc.body.style.border = '0px';
        }
        editbox.style.width = textobj.style.width;
        editbox.style.height = textobj.style.height;
        editdoc.body.style.background = '';
        editdoc.body.style.backgroundColor = '#FFFFFF';

    } else {
        var iframe = textobj.parentNode.getElementsByTagName('iframe')[0];
        if (iframe) {
            textobj.style.display = '';
            textobj.style.width = iframe.style.width;
            textobj.style.height = iframe.style.height;
            iframe.style.display = 'none';
        }
    }
}

function setEditorEvents() {
    if (wysiwyg) {
        if (is_moz || is_opera) {
            editdoc.addEventListener('mouseup', function(e) { setContext(); popupmenu.hide(); }, true);
            editdoc.addEventListener('keyup', function(e) { setContext(); }, true);
            editwin.addEventListener('focus', function(e) { this.hasfocus = true; }, true);
            editwin.addEventListener('blur', function(e) { this.hasfocus = false; }, true);
            //editwin.addEventListener('keydown', function(e) {ctlent(e);}, true);
        } else {
            editdoc.onmouseup = function(e) { setContext(); popupmenu.hide(); };
            editdoc.onkeyup = function(e) { setContext(); };
            if (editdoc.attachEvent) {
                //editdoc.body.attachEvent("onkeydown", ctlent);
            }
        }
    }
    editwin.onfocus = function(e) { this.hasfocus = true; };
    editwin.onblur = function(e) { this.hasfocus = false; };
}

function wrapTags(tagname, useoption, selection) {

    if (tagname == 'code') {
        applyFormat('removeformat');
    }

    if (isUndefined(selection)) {
        var selection = getSel();
        if (selection === false) {
            selection = '';
        } else {
            selection += '';
        }
    }

    if (useoption === true) {
        var option = showPrompt(construct_phrase(lang['enter_tag_option'], ('[' + tagname + ']')), '');
        if (option = verifyPrompt(option)) {
            var opentag = '[' + tagname + '=' + option + ']';
        } else {
            return false;
        }
    } else if (useoption !== false) {
        var opentag = '[' + tagname + '=' + useoption + ']';
    } else {
        var opentag = '[' + tagname + ']';
    }

    var closetag = '[/' + tagname + ']';
    var text = opentag + selection + closetag;
    insertText(text, mb_strlen(opentag), mb_strlen(closetag));

    return false;
}

function applyFormat(cmd, dialog, argument) {

    if (wysiwyg) {
        editdoc.execCommand(cmd, (isUndefined(dialog) ? false : dialog), (isUndefined(argument) ? true : argument));
        return false;
    }
    switch (cmd) {
        case 'bold':
        case 'italic':
        case 'underline':
            wrapTags(cmd.substr(0, 1), false);
            break;
        case 'justifyleft':
        case 'justifycenter':
        case 'justifyright':
            wrapTags('align', cmd.substr(7));
            break;
        case 'indent':
            wrapTags(cmd, false);
            break;
        case 'fontname':
            wrapTags('font', argument);
            break;
        case 'fontsize':
            wrapTags('size', argument);
            break;
        case 'forecolor':
            wrapTags('color', argument);
            break;
        case 'createlink':
            var sel = getSel();
            if (sel) {
                wrapTags('url', argument);
            } else {
                wrapTags('url', argument, argument);
            }
            break;
        case 'insertimage':
            wrapTags('img', false, argument);
            break;
    }
}

function customTags(tagname, params) {
    applyFormat('removeformat');

    if (custombbcodes[tagname].indexOf(']') == -1) {
        custombbcodes[tagname] = '[' + tagname + '][/' + tagname + ']';
    }

    if (params == 1) {
        var selection = getSel();
        if (selection === false) {
            selection = '';
        } else {
            selection += '';
        }

        var opentag = '[' + tagname + ']';
        var closetag = '[/' + tagname + ']';
        var text = opentag + selection + closetag;
        selection == '' ? insertText(custombbcodes[tagname], mb_strlen('[' + tagname + ']'), mb_strlen('[/' + tagname + ']')) : insertText(text, mb_strlen(opentag), mb_strlen(closetag));
    } else {
        insertText(custombbcodes[tagname], custombbcodes[tagname].indexOf(']') + 1, mb_strlen('[/' + tagname + ']'));
    }

    return false;
}

function discuzcode(cmd, arg) {
    if (cmd != 'redo') {
        addSnapshot(getEditorContents());
    }

    checkFocus();

    if (in_array(cmd, ['quote', 'code'])) {
        var ret = wrapTags(cmd, false);
    } else if (cmd.substr(0, 6) == 'custom') {
        var ret = customTags(cmd.substr(8), cmd.substr(6, 1));
    } else if (!wysiwyg && cmd == 'removeformat') {
        var simplestrip = new Array('b', 'i', 'u');
        var complexstrip = new Array('font', 'color', 'size');

        var str = getSel();
        if (str === false) {
            return;
        }
        for (var tag in simplestrip) {
            str = stripSimple(simplestrip[tag], str);
        }
        for (var tag in complexstrip) {
            str = stripComplex(complexstrip[tag], str);
        }
        insertText(str);
    } else if (!wysiwyg && cmd == 'undo') {
        addSnapshot(getEditorContents());
        moveCursor(-1);
        if ((str = getSnapshot()) !== false) {
            editdoc.value = str;
        }
    } else if (!wysiwyg && cmd == 'redo') {
        moveCursor(1);
        if ((str = getSnapshot()) !== false) {
            editdoc.value = str;
        }
    } else if (!wysiwyg && in_array(cmd, ['insertorderedlist', 'insertunorderedlist'])) {
        var listtype = cmd == 'insertorderedlist' ? '1' : '';
        var opentag = '[list' + (listtype ? ('=' + listtype) : '') + ']\n';
        var closetag = '[/list]';

        if (txt = getSel()) {
            var regex = new RegExp('([\r\n]+|^[\r\n]*)(?!\\[\\*\\]|\\[\\/?list)(?=[^\r\n])', 'gi');
            txt = opentag + trim(txt).replace(regex, '$1[*]') + '\n' + closetag;
            insertText(txt, mb_strlen(txt), 0);
        } else {
            insertText(opentag + closetag, opentag.length, closetag.length);

            while (listvalue = prompt(lang['enter_list_item'], '')) {
                if (is_opera && opera.version() > 8) {
                    listvalue = '\n' + '[*]' + listvalue;
                    insertText(listvalue, mb_strlen(listvalue) + 1, 0);
                } else {
                    listvalue = '[*]' + listvalue + '\n';
                    insertText(listvalue, mb_strlen(listvalue), 0);
                }
            }
        }
    } else if (!wysiwyg && cmd == 'outdent') {
        var sel = getSel();
        sel = stripSimple('indent', sel, 1);
        insertText(sel);
    } else if (cmd == 'createlink') {
        var url = arg;
        if ((url = verifyPrompt(url)) !== false) {
            if (getSel()) {
                applyFormat('unlink');
                applyFormat('createlink', false, (isUndefined(url) ? true : url));
            } else {
                insertText('<a href="' + url + '">' + url + '</a>');
            }
        }
    } else if (!wysiwyg && cmd == 'unlink') {
        var sel = getSel();
        sel = stripSimple('url', sel);
        sel = stripComplex('url', sel);
        insertText(sel);
    }  else if (cmd == 'insertimage') {
        var img = arg;
        if (img = verifyPrompt(img)) {
            return applyFormat('insertimage', false, img);
        } else {
            return false;
        }
    } else {
        var ret = applyFormat(cmd, false, (isUndefined(arg) ? true : arg));
    }

    if (cmd != 'undo') {
        addSnapshot(getEditorContents());
    }
    if (wysiwyg) {
        setContext(cmd);
        if (cmd == 'forecolor') {
            $(editorid + '_color_bar').style.backgroundColor = arg;
        }
    }
    checkFocus();
    return ret;
}

function setContext(cmd) {
    var contextcontrols = new Array('bold', 'italic', 'underline', 'justifyleft', 'justifycenter', 'justifyright', 'insertorderedlist', 'insertunorderedlist');
    for (var i in contextcontrols) {
        var obj = $(editorid + '_cmd_' + contextcontrols[i]);
        if (obj != null) {
            try {
                var state = editdoc.queryCommandState(contextcontrols[i]);
            } catch (e) {
                var state = false;
            }
            if (isUndefined(obj.state)) {
                obj.state = false;
            }
            if (obj.state != state) {
                obj.state = state;
                buttonContext(obj, (obj.id.substr(obj.id.indexOf('_cmd_') + 5) == cmd ? 'mouseover' : 'mouseout'));
            }
        }
    }

    var fs = editdoc.queryCommandValue('fontname');
    if (fs == '' && !is_ie && window.getComputedStyle) {
        fs = editdoc.body.style.fontFamily;
    } else if (fs == null) {
        fs = '';
    }
    if (fs != $(editorid + '_font_out').fontstate) {
        thingy = fs.indexOf(',') > 0 ? fs.substr(0, fs.indexOf(',')) : fs;
        $(editorid + '_font_out').innerHTML = thingy;
        $(editorid + '_font_out').fontstate = fs;
    }

    var ss = editdoc.queryCommandValue('fontsize');
    if (ss == null || ss == '') {
        ss = formatFontsize(editdoc.body.style.fontSize);
    }
    if (ss != $(editorid + '_size_out').sizestate) {
        if ($(editorid + '_size_out').sizestate == null) {
            $(editorid + '_size_out').sizestate = '';
        }
        $(editorid + '_size_out').innerHTML = ss;
        $(editorid + '_size_out').sizestate = ss;
    }

    var cs = editdoc.queryCommandValue('forecolor');
    $(editorid + '_color_bar').style.backgroundColor = rgbToColor(cs);
}

function buttonContext(obj, state) {
    if (state == 'mouseover') {
        var mode = obj.state ? 'down' : 'hover';
        if (obj.mode != mode) {
            obj.mode = mode;
            obj.className = 'editor_button' + mode;
        }
    } else {
        var mode = obj.state ? 'selected' : 'normal';
        if (obj.mode != mode) {
            obj.mode = mode;
            obj.className = mode == 'selected' ? 'editor_buttonselected' : 'editor_button' + 'normal';
        }
    }
    if (is_ie && event) {
        event.cancelBubble = true;
    }
}

function menuContext(obj, state) {
    obj.style.cursor = is_ie ? 'hand' : 'pointer';
    var mode = state == 'mouseover' ? 'hover' : 'normal';
    obj.className = 'editor_button' + mode;
    var tds = findtags(obj, 'td');
    for (var i = 0; i < tds.length; i++) {
        if (tds[i].id == editorid + '_menu') {
            tds[i].className = 'editor_menu' + mode;
        } else if (tds[i].id == editorid + '_colormenu') {
            tds[i].className = 'editor_colormenu' + mode;
        }
    }
}

function colorContext(obj, state) {
    obj.style.cursor = is_ie ? 'hand' : 'pointer';
    var mode = state == 'mouseover' ? 'hover' : 'normal';
    obj.className = 'editor_color' + mode;
}

function getSel() {
    if (wysiwyg) {
        if (is_moz || is_opera) {
            selection = editwin.getSelection();
            checkFocus();
            range = selection ? selection.getRangeAt(0) : editdoc.createRange();
            return readNodes(range.cloneContents(), false);
        } else {
            var range = editdoc.selection.createRange();
            if (range.htmlText && range.text) {
                return range.htmlText;
            } else {
                var htmltext = '';
                for (var i = 0; i < range.length; i++) {
                    htmltext += range.item(i).outerHTML;
                }
                return htmltext;
            }
        }
    } else {
        if (!isUndefined(editdoc.selectionStart)) {
            return editdoc.value.substr(editdoc.selectionStart, editdoc.selectionEnd - editdoc.selectionStart);
        } else if (document.selection && document.selection.createRange) {
            return document.selection.createRange().text;
        } else if (window.getSelection) {
            return window.getSelection() + '';
        } else {
            return false;
        }
    }
}

function insertText(text, movestart, moveend) {
    if (wysiwyg) {
        if (is_moz || is_opera) {
            var fragment = editdoc.createDocumentFragment();
            var holder = editdoc.createElement('span');
            holder.innerHTML = text;

            while (holder.firstChild) {
                fragment.appendChild(holder.firstChild);
            }
            insertNodeAtSelection(fragment);
        } else {
            checkFocus();
            if (!isUndefined(editdoc.selection) && editdoc.selection.type != 'Text' && editdoc.selection.type != 'None') {
                movestart = false;
                editdoc.selection.clear();
            }

            var sel = editdoc.selection.createRange();

            sel.pasteHTML(text);

            if (text.indexOf('\n') == -1) {
                if (!isUndefined(movestart)) {
                    sel.moveStart('character', -mb_strlen(text) + movestart);
                    sel.moveEnd('character', -moveend);
                } else if (movestart != false) {
                    sel.moveStart('character', -mb_strlen(text));
                }
            }
        }
    } else {

        checkFocus();
        if (!isUndefined(editdoc.selectionStart)) {

            var opn = editdoc.selectionStart + 0;

            editdoc.value = editdoc.value.substr(0, editdoc.selectionStart) + text + editdoc.value.substr(editdoc.selectionEnd);

            if (!isUndefined(movestart)) {
                editdoc.selectionStart = opn + movestart;
                editdoc.selectionEnd = opn + mb_strlen(text) - moveend;
            } else if (movestart !== false) {
                editdoc.selectionStart = opn;
                editdoc.selectionEnd = opn + mb_strlen(text);
            }
        } else if (document.selection && document.selection.createRange) {

            var sel = document.selection.createRange();
            sel.text = text.replace(/\r?\n/g, '\r\n');

            if (!isUndefined(movestart)) {
                sel.moveStart('character', -mb_strlen(text) + movestart);
                sel.moveEnd('character', -moveend);
            } else if (movestart !== false) {
                sel.moveStart('character', -mb_strlen(text));
            }
            sel.select();
        } else {
            editdoc.value += text;
        }
    }
}

function isUndefined(variable) {
    return typeof variable == 'undefined' ? true : false;
}


function showPrompt(dialogtxt, defaultval) {
    return trim(prompt(dialogtxt, defaultval) + '');
}

function verifyPrompt(str) {
    if (in_array(str, ['http://', 'null', 'undefined', 'false', '']) || str == null || str == false) {
        return false;
    } else {
        return str;
    }
}

function promptLink(tagname, phrase, iprompt) {
    var value = showPrompt(phrase, iprompt);
    if ((value = verifyPrompt(value)) !== false) {
        if (getSel()) {
            applyFormat('unlink');
            wrapTags(tagname, value);
        } else {
            wrapTags(tagname, value, value);
        }
    }
    return true;
}

function trim(str) {
    return (str.replace(/(\s+)$/g, '')).replace(/^\s+/g, '');
}

function stripSimple(tag, str, iterations) {
    var opentag = '[' + tag + ']';
    var closetag = '[/' + tag + ']';

    if (isUndefined(iterations)) {
        iterations = -1;
    }
    while ((startindex = stripos(str, opentag)) !== false && iterations != 0) {
        iterations--;
        if ((stopindex = stripos(str, closetag)) !== false) {
            var text = str.substr(startindex + opentag.length, stopindex - startindex - opentag.length);
            str = str.substr(0, startindex) + text + str.substr(stopindex + closetag.length);
        } else {
            break;
        }
    }
    return str;
}

function stripComplex(tag, str, iterations) {
    var opentag = '[' + tag + '=';
    var closetag = '[/' + tag + ']';

    if (isUndefined(iterations)) {
        iterations = -1;
    }
    while ((startindex = stripos(str, opentag)) !== false && iterations != 0) {
        iterations--;
        if ((stopindex = stripos(str, closetag)) !== false) {
            var openend = stripos(str, ']', startindex);
            if (openend !== false && openend > startindex && openend < stopindex) {
                var text = str.substr(openend + 1, stopindex - openend - 1);
                str = str.substr(0, startindex) + text + str.substr(stopindex + closetag.length);
            } else {
                break;
            }
        } else {
            break;
        }
    }
    return str;
}

function stripos(haystack, needle, offset) {
    if (isUndefined(offset)) {
        offset = 0;
    }
    var index = haystack.toLowerCase().indexOf(needle.toLowerCase(), offset);

    return (index == -1 ? false : index);
}

function switchEditor(mode) {

    mode = parseInt(mode);
    if (mode == wysiwyg || !allowswitcheditor) {
        return;
    }
    if (!mode) {
        var controlbar = $(editorid + '_controls');
        var controls = new Array();
        var buttons = findtags(controlbar, 'div');
        var buttonslength = buttons.length;
        for (var i = 0; i < buttonslength; i++) {
            if (buttons[i].id) {
                controls[controls.length] = buttons[i].id;
            }
        }
        var controlslength = controls.length;
        for (var i = 0; i < controlslength; i++) {
            var control = $(controls[i]);

            if (control.id.indexOf(editorid + '_cmd_') != -1) {
                control.className = 'editor_buttonnormal';
                control.state = false;
                control.mode = 'normal';
            } else if (control.id.indexOf(editorid + '_popup_') != -1) {
                control.state = false;
            }
        }
    }
    cursor = -1;
    stack = new Array();
    $(editorid + '_font_out').innerHTML = lang['fontname'];
    $(editorid + '_size_out').innerHTML = lang['fontsize'];
    $(editorid + '_font_out').fontstate = null;
    $(editorid + '_size_out').sizestate = null;
    $(editorid + '_color_bar').style.backgroundColor = '#000000';
    var parsedtext = getEditorContents();
   
    parsedtext = mode ? bbcode2html(parsedtext) : html2bbcode(parsedtext);
    wysiwyg = mode;
    $(editorid + '_mode').value = mode;

    newEditor(mode, parsedtext);
    checkFocus();
}

function formatFontsize(csssize) {
    switch (csssize) {
        case '7.5pt':
        case '10px': return 1;
        case '10pt': return 2;
        case '12pt': return 3;
        case '14pt': return 4;
        case '18pt': return 5;
        case '24pt': return 6;
        case '36pt': return 7;
        default: return lang['fontsize'];
    }
}

function rgbToColor(forecolor) {
    if (!is_moz && !is_opera) {
        return rgbhexToColor((forecolor & 0xFF).toString(16), ((forecolor >> 8) & 0xFF).toString(16), ((forecolor >> 16) & 0xFF).toString(16));
    }
    if (forecolor == '' || forecolor == null) {
        forecolor = window.getComputedStyle(editdoc.body, null).getPropertyValue('color');
    }
    if (forecolor.toLowerCase().indexOf('rgb') == 0) {
        var matches = forecolor.match(/^rgb\s*\(([0-9]+),\s*([0-9]+),\s*([0-9]+)\)$/);
        if (matches) {
            return rgbhexToColor((matches[1] & 0xFF).toString(16), (matches[2] & 0xFF).toString(16), (matches[3] & 0xFF).toString(16));
        } else {
            return rgbToColor(null);
        }
    } else {
        return forecolor;
    }
}

function rgbhexToColor(r, g, b) {
    var coloroptions = { '#000000': 'Black', '#a0522d': 'Sienna', '#556b2f': 'DarkOliveGreen', '#006400': 'DarkGreen', '#483d8b': 'DarkSlateBlue', '#000080': 'Navy', '#4b0082': 'Indigo', '#2f4f4f': 'DarkSlateGray', '#8b0000': 'DarkRed', '#ff8c00': 'DarkOrange', '#808000': 'Olive', '#008000': 'Green', '#008080': 'Teal', '#0000ff': 'Blue', '#708090': 'SlateGray', '#696969': 'DimGray', '#ff0000': 'Red', '#f4a460': 'SandyBrown', '#9acd32': 'YellowGreen', '#2e8b57': 'SeaGreen', '#48d1cc': 'MediumTurquoise', '#4169e1': 'RoyalBlue', '#800080': 'Purple', '#808080': 'Gray', '#ff00ff': 'Magenta', '#ffa500': 'Orange', '#ffff00': 'Yellow', '#00ff00': 'Lime', '#00ffff': 'Cyan', '#00bfff': 'DeepSkyBlue', '#9932cc': 'DarkOrchid', '#c0c0c0': 'Silver', '#ffc0cb': 'Pink', '#f5deb3': 'Wheat', '#fffacd': 'LemonChiffon', '#98fb98': 'PaleGreen', '#afeeee': 'PaleTurquoise', '#add8e6': 'LightBlue', '#dda0dd': 'Plum', '#ffffff': 'White' };
    return coloroptions['#' + (str_pad(r, 2, 0) + str_pad(g, 2, 0) + str_pad(b, 2, 0))];
}

function str_pad(text, length, padstring) {
    text += '';
    padstring += '';

    if (text.length < length) {
        padtext = padstring;

        while (padtext.length < (length - text.length)) {
            padtext += padstring;
        }

        text = padtext.substr(0, (length - text.length)) + text;
    }

    return text;
}

function insertNodeAtSelection(text) {
    checkFocus();

    var sel = editwin.getSelection();
    var range = sel ? sel.getRangeAt(0) : editdoc.createRange();
    sel.removeAllRanges();
    range.deleteContents();

    var node = range.startContainer;
    var pos = range.startOffset;

    switch (node.nodeType) {
        case Node.ELEMENT_NODE:
            if (text.nodeType == Node.DOCUMENT_FRAGMENT_NODE) {
                selNode = text.firstChild;
            } else {
                selNode = text;
            }
            node.insertBefore(text, node.childNodes[pos]);
            add_range(selNode);
            break;

        case Node.TEXT_NODE:
            if (text.nodeType == Node.TEXT_NODE) {
                var text_length = pos + text.length;
                node.insertData(pos, text.data);
                range = editdoc.createRange();
                range.setEnd(node, text_length);
                range.setStart(node, text_length);
                sel.addRange(range);
            } else {
                node = node.splitText(pos);
                var selNode;
                if (text.nodeType == Node.DOCUMENT_FRAGMENT_NODE) {
                    selNode = text.firstChild;
                } else {
                    selNode = text;
                }
                node.parentNode.insertBefore(text, node);
                add_range(selNode);
            }
            break;
    }
}

function add_range(node) {
    checkFocus();
    var sel = editwin.getSelection();
    var range = editdoc.createRange();
    range.selectNodeContents(node);
    sel.removeAllRanges();
    sel.addRange(range);
}

function readNodes(root, toptag) {
    var html = "";
    var moz_check = /_moz/i;

    switch (root.nodeType) {
        case Node.ELEMENT_NODE:
        case Node.DOCUMENT_FRAGMENT_NODE:
            var closed;
            if (toptag) {
                closed = !root.hasChildNodes();
                html = '<' + root.tagName.toLowerCase();
                var attr = root.attributes;
                for (var i = 0; i < attr.length; ++i) {
                    var a = attr.item(i);
                    if (!a.specified || a.name.match(moz_check) || a.value.match(moz_check)) {
                        continue;
                    }
                    html += " " + a.name.toLowerCase() + '="' + a.value + '"';
                }
                html += closed ? " />" : ">";
            }
            for (var i = root.firstChild; i; i = i.nextSibling) {
                html += readNodes(i, true);
            }
            if (toptag && !closed) {
                html += "</" + root.tagName.toLowerCase() + ">";
            }
            break;

        case Node.TEXT_NODE:
            html = htmlspecialchars(root.data);
            break;
    }
    return html;
}

function moveCursor(increment) {
    var test = cursor + increment;
    if (test >= 0 && stack[test] != null && !isUndefined(stack[test])) {
        cursor += increment;
    }
}

function addSnapshot(str) {
    if (stack[cursor] == str) {
        return;
    } else {
        cursor++;
        stack[cursor] = str;

        if (!isUndefined(stack[cursor + 1])) {
            stack[cursor + 1] = null;
        }
    }
}

function getSnapshot() {
    if (!isUndefined(stack[cursor]) && stack[cursor] != null) {
        return stack[cursor];
    } else {
        return false;
    }
}