User:Remember the dot/Syntax highlighter.js

//Syntax highlighter with various advantages //See User:Remember the dot/Syntax highlighter for more information

(function {    "use strict";    //variables that are preserved between function calls    var textboxContainer;    var wpTextbox0;    var wpTextbox1;    var syntaxStyleTextNode;    var lastText;    var maxSpanNumber = -1; //the number of the last span available, used to tell if creating additional spans is necessary    var highlightSyntaxIfNeededIntervalID;    /* Define context-specific regexes, one for every common token that ends the       current context.       An attempt has been made to search for the most common syntaxes first,       thus maximizing performance. Syntaxes that begin with the same character       are searched for at the same time.       Wiki syntaxes from most common to least common:           internal link [http:// named external link]             {| table |}           http:// bare external link           =Heading= * unordered list # ordered list : indent ; small heading  pre  horizontal line italic bold three tildes username four tildes signature five tildes timestamp &entity; The tag-matching regex follows the XML standard closely so that users won't feel like they have to escape sequences that MediaWiki will never consider to be tags. Only entities for characters which need to be escaped or cannot be      unambiguously represented in a monospace font are highlighted, such as       Greek letters that strongly resemble Latin letters. Use of other entities is discouraged as a matter of style. For the same reasons, numeric entities should be in hexadecimal (giving character codes in decimal only      adds confusion). Flags: g for global search, m for make ^ match the beginning of each line and $ the end of each line */   var breakerRegexBase = "\\[(?:\\[|(?:https?:|ftp:)?//|mailto:)|\\{(?:\\{\\{?|\\|)|<(?:[:A-Z_a-z\u00C0-\u00D6\u00D8-\u00F6\u00F8-\u02FF\u0370-\u037D\u037F-\u1FFF\u200C\u200D\u2070-\u218F\u2C00-\u2FEF\u3001-\uD7FF\uF900-\uFDCF\uFDF0-\uFFFD][:\\w\u00C0-\u00D6\u00D8-\u00F6\u00F8-\u02FF\u0370-\u037D\u037F-\u1FFF\u200C\u200D\u2070-\u218F\u2C00-\u2FEF\u3001-\uD7FF\uF900-\uFDCF\uFDF0-\uFFFD-\\.\u00B7\u0300-\u036F\u203F-\u203F-\u2040]*(?=/?>| )|!--[^]*?-->)|(?:https?://|ftp://|mailto:)[^\\s\"<>[\\]{-}]*[^\\s\",\\.:;<>[\\]{-}]|^(?:=|[*#:;]+|-{4,})|\\\\'\\\\'(?:\\\\')?|&(?:(?:n(?:bsp|dash)|m(?:dash|inus)|lt|e[mn]sp|thinsp|amp|quot|gt|shy|zwn?j|lrm|rlm|Alpha|Beta|Epsilon|Zeta|Eta|Iota|Kappa|[Mm]u|micro|Nu|[Oo]micron|[Rr]ho|Tau|Upsilon|Chi)|#x[0-9a-fA-F]+);|~{3,5}"; function breakerRegexWithPrefix(prefix) {       //the stop token has to be at the beginning of the regex so that it takes precedence over substrings of itself. //suck up newlines into the end token to avoid creating spans with nothing but newlines in them return new RegExp("(" + prefix + ")\n*|" + breakerRegexBase, "gm"); }   var defaultBreakerRegex           = new RegExp(breakerRegexBase, "gm"); var wikilinkBreakerRegex         = breakerRegexWithPrefix("]][a-zA-Z]*"); var namedExternalLinkBreakerRegex = breakerRegexWithPrefix("]"); var parameterBreakerRegex        = breakerRegexWithPrefix("}}}"); var templateBreakerRegex         = breakerRegexWithPrefix("}}"); var tableBreakerRegex            = breakerRegexWithPrefix("\\|}"); var headingBreakerRegex          = breakerRegexWithPrefix("\n"); var tagBreakerRegexCache         = {}; //browser workaround triggers var gecko  = ($.client.profile.layout == "gecko"); var presto = ($.client.profile.layout == "presto"); var trident = ($.client.profile.layout == "trident"); var webkit = ($.client.profile.layout == "webkit") && ($.client.profile.platform != "win"); function highlightSyntax {       lastText = wpTextbox1.value; /* Backslashes and apostrophes are CSS-escaped at the beginning and all parsing regexes and functions are designed to match. On the other hand, newlines are not escaped until written so that in the regexes ^ and $ work for both newlines and the beginning or end of the string. */       var text = lastText.replace(/['\\]/g, "\\$&") + "\n"; //add a newline to fix scrolling and parsing issues var i = 0; //the location of the parser as it goes through var text var css = ""; var spanNumber = 0; var lastColor; var before = true; /* Highlighting bold or italic markup presents a special challenge because the actual MediaWiki parser uses multiple passes to determine which ticks represent start tags and which represent end tags. Because that would be too slow for us here, we instead keep track of          what kinds of unclosed opening ticks have been encountered and use that to make a good guess as to whether the next ticks encountered are an opening tag or a closing tag. The major downsides to this method are that 'apostrophe italic and italic apostrophe' are not highlighted correctly, and bold and italic are both highlighted in the same color. */       var assumedBold = false; var assumedItalic = false; //workaround for Opera //there are two problems here: // .scrollLeft is automatically scrolled beyond the value limit that http://www.w3.org/TR/cssom-view/#scroll-an-element specifies // will hide a character or two underneath the scrollbar instead of adding a scrollbar //this workaround forces wpTextbox0 to allow scrolling arbitrarily if (presto) {           text += new Array(wpTextbox1.scrollWidth).join(" "); }       //writes text into to-be-created span elements of wpTextbox0 using :before and :after pseudo-elements //both :before and :after are used because using two pseudo-elements per span is significantly faster than doubling the number of spans required function writeText(text, color) {           //workaround for Chromium on Linux breaking before spaces in the div but after spaces in the textarea if (webkit) {               text = text.replace(/ +/g, "$&\u200B"); }           //no need to use another span if using the same color if (color != lastColor) {               //whitespace is omitted in the hope of increasing performance css += "'}#s" + spanNumber; //spans will be created with IDs s0 through sN               if (before) {                   css += ":before{"; before = false; }               else {                   css += ":after{"; before = true; ++spanNumber; }               if (color) {                   //"background-color" is 6 characters longer than "background" but the browser processes it faster css += "background-color:" + color + ";"; }               css += "content:'"; lastColor = color; }           css += text; }       function highlightBlock(color, breakerRegex) {           var match; for (breakerRegex.lastIndex = i; match = breakerRegex.exec(text); breakerRegex.lastIndex = i)           { if (match[1]) {                   //end token found writeText(text.substring(i, breakerRegex.lastIndex), color); i = breakerRegex.lastIndex; return; }               var endIndexOfLastColor = breakerRegex.lastIndex - match[0].length; if (i < endIndexOfLastColor) //avoid calling writeText with text == "" to improve performance {                   writeText(text.substring(i, endIndexOfLastColor), color); }               i = breakerRegex.lastIndex; switch (match[0].charAt(0)) //cases in this switch should be arranged from most common to least common {                   case "[": if (match[0].charAt(1) == "[") {                           //wikilink writeText("[[", syntaxHighlighterConfig.wikilinkColor || color);                           highlightBlock(syntaxHighlighterConfig.wikilinkColor || color, wikilinkBreakerRegex);                        }                        else                        {                            //named external link                            writeText(match[0], syntaxHighlighterConfig.externalLinkColor || color);                            highlightBlock(syntaxHighlighterConfig.externalLinkColor || color, namedExternalLinkBreakerRegex);                        }                        break;                    case "{":                        if (match[0].charAt(1) == "{")                        {                            if (match[0].length == 3)                            {                                //parameter                                writeText("{{{", syntaxHighlighterConfig.parameterColor || color);                                highlightBlock(syntaxHighlighterConfig.parameterColor || color, parameterBreakerRegex);                            }                            else                            {                                //template                                writeText("{{", syntaxHighlighterConfig.templateColor || color);                                highlightBlock(syntaxHighlighterConfig.templateColor || color, templateBreakerRegex);                            }                        }                        else //|                        {                            //table                            writeText("{|", syntaxHighlighterConfig.tableColor || color);                            highlightBlock(syntaxHighlighterConfig.tableColor || color, tableBreakerRegex);                        }                        break;                    case "<":                        if (match[0].charAt(1) == "!")                        {                            //comment tag                            writeText(match[0], syntaxHighlighterConfig.commentColor || color);                            break;                        }                        else                        {                            //some other kind of tag, search for its end                            //the search is made easier because XML attributes may not contain the character ">"                            var tagEnd = text.indexOf(">", i) + 1;                            if (tagEnd == 0)                            {                                //not a tag, just a "<" with some text after it                                writeText("<", color);                                i = i - match[0].length + 1;                                break;                            }                            if (text.charAt(tagEnd - 2) == "/")                            {                                //empty tag                                writeText(text.substring(i - match[0].length, tagEnd), syntaxHighlighterConfig.tagColor || color);                                i = tagEnd;                            }                            else                            {                                var tagName = match[0].substring(1);                                //again, cases are ordered from most common to least common                                if (/^(?:nowiki|pre|math|syntaxhighlight|source|timeline|hiero)$/.test(tagName))                                {                                    //tag that can contain only plain text                                    var stopAfter = "";                                    var endIndex = text.indexOf(stopAfter, i);                                    if (endIndex == -1)                                    {                                        endIndex = text.length;                                    }                                    else                                    {                                        endIndex += stopAfter.length;                                    }                                    writeText(text.substring(i - match[0].length, endIndex), syntaxHighlighterConfig.tagColor || color);                                    i = endIndex;                                }                                else                                {                                    //ordinary tag                                    writeText(text.substring(i - match[0].length, tagEnd), syntaxHighlighterConfig.tagColor || color);                                    i = tagEnd;                                    if (!tagBreakerRegexCache[tagName])                                    {                                        tagBreakerRegexCache[tagName] = breakerRegexWithPrefix("");                                    }                                    highlightBlock(syntaxHighlighterConfig.tagColor || color, tagBreakerRegexCache[tagName]);                                }                            }                        }                        break;                    case "h":                    case "f":                    case "m":                        //bare external link                        writeText(match[0], syntaxHighlighterConfig.externalLinkColor || color);                        break;                    case "=":                        if (/[^=]=+$/.test(text.substring(i, text.indexOf("\n", i)))) //the line begins and ends with an equals sign and has something else in the middle                        {                            //heading                            writeText("=", syntaxHighlighterConfig.headingColor || color);                            highlightBlock(syntaxHighlighterConfig.headingColor || color, headingBreakerRegex);                        }                        else                        {                            writeText("=", color); //move on, process this line as regular wikitext                        }                        break;                    case "*":                    case "#":                    case ":":                        //unordered list, ordered list, indent, small heading                        //just highlight the marker                        writeText(match[0], syntaxHighlighterConfig.listOrIndentColor || color);                        break;                    case ";":                        //small heading                        writeText(";", syntaxHighlighterConfig.headingColor || color);                        highlightBlock(syntaxHighlighterConfig.headingColor || color, headingBreakerRegex);                        break;                    case "-":                        //horizontal line                        writeText(match[0], syntaxHighlighterConfig.hrColor || color);                        break;                    case "\\":                        writeText(match[0], syntaxHighlighterConfig.boldOrItalicColor || color);                        if (match[0].length == 6)                        {                            //bold                            if (assumedBold)                            {                                //end tag                                assumedBold = false;                                return;                            }                            else                            {                                //start tag                                assumedBold = true;                                highlightBlock(syntaxHighlighterConfig.boldOrItalicColor || color, defaultBreakerRegex);                            }                        }                        else                        {                            //italic                            if (assumedItalic)                            {                                //end tag                                assumedItalic = false;                                return;                            }                            else                            {                                //start tag                                assumedItalic = true;                                highlightBlock(syntaxHighlighterConfig.boldOrItalicColor || color, defaultBreakerRegex);                            }                        }                        break;                    case "&":                        //entity                        writeText(match[0], syntaxHighlighterConfig.entityColor || color);                        break;                    case "~":                        //username, signature, timestamp                        writeText(match[0], syntaxHighlighterConfig.signatureColor || color);                }            }        }        //start!        var startTime = Date.now;        highlightBlock("", defaultBreakerRegex);        //output the leftovers (if any) to make sure whitespace etc. matches        if (i < text.length)        {            writeText(text.substring(i), "");        }        //do we have enough span elements to match the generated CSS?        while (maxSpanNumber < spanNumber)        {            wpTextbox0.appendChild(document.createElement("span")).id = "s" + ++maxSpanNumber;        }        /* finish CSS: move the extra '} from the beginning to the end and CSS-           escape newlines. CSS ignores the space after the hex code of the           escaped character */        syntaxStyleTextNode.nodeValue = css.substring(2).replace(/\n/g, "\\A ") + "'}";        //if highlighting took too long, disable it.        var endTime = Date.now;        /*if (typeof(bestTime) == "undefined")        {            window.bestTime = 10000;            highlightSyntaxIfNeededIntervalID = setInterval(highlightSyntax, 250);        }        else        {            if (endTime - startTime < bestTime)            {                bestTime = endTime - startTime;                document.title = bestTime;            }        }//*/        if (endTime - startTime > syntaxHighlighterConfig.timeout)        {            clearInterval(highlightSyntaxIfNeededIntervalID);            syntaxStyleTextNode.nodeValue = "";            wpTextbox1.removeEventListener("input", highlightSyntax);            var errorMessage = {};            errorMessage["ca"] = "S'ha desactivat el remarcar de sintaxi en aquesta pàgina perquè ha tardat massa. El temps màxim permès per a remarcar és $1ms, i el teu ordinador ha trigat $2ms. Prova tancar algunes pestanyes i programes i fer clic en \"Mostra la previsualització\" o \"Mostra els canvis\". Si no funciona això, prova altre navegador web, i si això no funciona, prova un ordinador més ràpid.";            errorMessage["en"] = "Syntax highlighting on this page was disabled because it took too long. The maximum allowed highlighting time is $1ms, and your computer took $2ms. Try closing some tabs and programs and clicking \"Show preview\" or \"Show changes\". If that doesn't work, try a different web browser, and if that doesn't work, try a faster computer.";            errorMessage["es"] = "Se desactivó el resaltar de sintaxis en esta página porque tardó demasiado. El tiempo máximum permitido para resaltar es $1ms, y tu ordenador tardó $2ms. Prueba cerrar algunas pestañas y programas y hacer clic en \"Mostrar previsualización\" o \"Mostrar cambios\". Si no funciona esto, prueba otro navegador web, y si eso no funciona, prueba un ordenador más rápido.";            errorMessage["io"] = "Sintaxo-hailaitar en ca pagino esis nekapabligata pro ke konsumis tro multa tempo. La maxima permisata hailaitala tempo es $1ms, e tua ordinatro konsumis $2ms. Probez klozar kelka tabi e programi e kliktar \"Previdar\" o \"Montrez chanji\". Se to ne funcionas, probez altra brauzero, e se to ne funcionas, probez plu rapida ordinatro.";            errorMessage["pt"] = "O marcador de sintaxe foi desativado nesta pagina porque demorou demais. O tempo máximo permitido para marcar e $1ms, e seu computador demorou $2ms. Tenta sair de alguns programas e clique em \"Mostrar previsão\" ou \"Mostrar alterações\". Se isso não funciona, tenta usar uma outra navegador web, e se ainda não funciona, procura um computador mais rápido.";            errorMessage = errorMessage[wgUserLanguage] || errorMessage[wgUserLanguage.substring(0, wgUserLanguage.indexOf("-"))] || errorMessage["en"];            wpTextbox1.style.backgroundColor = "";            wpTextbox1.style.position = "";            wpTextbox0.style.color = "red";            wpTextbox0.style.fontFamily = "";            wpTextbox0.style.fontWeight = "bold";            wpTextbox0.style.height = "";            var range = document.createRange;            range.selectNode(wpTextbox0); //chrome can't live without this            wpTextbox0.appendChild(range.createContextualFragment(errorMessage.replace("$1", syntaxHighlighterConfig.timeout).replace("$2", endTime - startTime)));        }    }    function syncScrollX    {        wpTextbox0.scrollLeft = wpTextbox1.scrollLeft;    }    function syncScrollY    {        wpTextbox0.scrollTop = wpTextbox1.scrollTop;    }    //this function runs once every 500ms to detect changes to wpTextbox1's text that the input event does not catch    //this happens when another script changes the text without knowing that the syntax highlighter needs to be informed    function highlightSyntaxIfNeeded    {        if (wpTextbox1.value != lastText)        {            highlightSyntax;        }        if (wpTextbox1.scrollLeft != wpTextbox0.scrollLeft)        {            syncScrollX;        }        if (wpTextbox1.scrollTop != wpTextbox0.scrollTop)        {            syncScrollY;        }    }    function setup    {        function configureColor(parameterName, hardcodedFallback)        {            if (syntaxHighlighterConfig[parameterName] == "normal")            {                syntaxHighlighterConfig[parameterName] = hardcodedFallback;            }            else if (typeof(syntaxHighlighterConfig[parameterName]) != "undefined")            {                return;            }            else if (typeof(syntaxHighlighterConfig.defaultColor) != "undefined")            {                syntaxHighlighterConfig[parameterName] = syntaxHighlighterConfig.defaultColor;            }            else            {                syntaxHighlighterConfig[parameterName] = hardcodedFallback;            }        }        window.syntaxHighlighterConfig = window.syntaxHighlighterConfig || {};        //use 3-digit colors instead of 6-digit colors for performance        configureColor("boldOrItalicColor",  "#EEE"); //gray        configureColor("commentColor",       "#EFE"); //green        configureColor("entityColor",        "#DFD"); //green        configureColor("externalLinkColor",  "#EFF"); //cyan        configureColor("headingColor",       "#EEE"); //gray        configureColor("hrColor",            "#EEE"); //gray        configureColor("listOrIndentColor",  "#EFE"); //green        configureColor("parameterColor",     "#FC6"); //orange        configureColor("signatureColor",     "#FC6"); //orange        configureColor("tagColor",           "#FEF"); //pink        configureColor("tableColor",         "#FFC"); //yellow        configureColor("templateColor",      "#FFC"); //yellow        configureColor("wikilinkColor",      "#EEF"); //blue        syntaxHighlighterConfig.timeout = syntaxHighlighterConfig.timeout || 100;        textboxContainer = document.createElement("div");        wpTextbox0 = document.createElement("div");        wpTextbox1 = document.getElementById("wpTextbox1");        var syntaxStyleElement = document.createElement("style");        syntaxStyleElement.type = "text/css";        syntaxStyleTextNode = syntaxStyleElement.appendChild(document.createTextNode(""));        //the styling of the textbox and the background div must be kept very similar        wpTextbox0.style.backgroundColor = window.getComputedStyle(wpTextbox1).backgroundColor;        if (wpTextbox0.style.backgroundColor == "transparent")        {            //Opera and perhaps others return "transparent" instead of "white" if the background color is not specified            //http://www.w3.org/TR/1998/REC-CSS2-19980512/cascade.html#computed-value is ambiguous as to what should happen            wpTextbox0.style.backgroundColor = "white";        }        wpTextbox0.style.border          = "1px solid transparent";        wpTextbox0.style.boxSizing       = "border-box";        wpTextbox0.style.MozBoxSizing    = "border-box";        wpTextbox0.style.color           = "transparent"; //makes it look just a little bit smoother        wpTextbox0.style.direction       = window.getComputedStyle(wpTextbox1).direction; //because your UI language set in Preferences may have a different direction than the edit box        wpTextbox0.style.fontFamily      = window.getComputedStyle(wpTextbox1).fontFamily;        wpTextbox0.style.fontSize        = window.getComputedStyle(wpTextbox1).fontSize;        wpTextbox0.style.lineHeight      = "normal";        wpTextbox0.style.overflowX       = "auto";        wpTextbox0.style.overflowY       = "scroll";        wpTextbox0.style.whiteSpace      = "pre-wrap";        wpTextbox0.style.width           = "100%";        wpTextbox0.style.wordWrap        = "normal"; //see below        wpTextbox1.style.backgroundColor = "transparent";        wpTextbox1.style.border          = "1px inset gray";        wpTextbox1.style.boxSizing       = "border-box";        wpTextbox1.style.MozBoxSizing    = "border-box";        wpTextbox1.style.lineHeight      = "normal";        wpTextbox1.style.margin          = 0; //firefox wants to put a 1px margin on the top and bottom of the textbox, which throws it out of alignment with wpTextbox0        wpTextbox1.style.overflowX       = "auto";        wpTextbox1.style.overflowY       = "scroll";        wpTextbox1.style.padding         = 0;        wpTextbox1.style.position        = "absolute";        wpTextbox1.style.resize          = "none";        wpTextbox1.style.left            = 0;        wpTextbox1.style.top             = 0;        wpTextbox1.style.width           = "100%";        wpTextbox1.style.wordWrap        = "normal"; //overall more visually appealing, and essential for Opera        //lock both heights to pixel values so that the browser zoom feature works better        wpTextbox0.style.height          = wpTextbox1.offsetHeight + "px";        wpTextbox1.style.height          = wpTextbox0.style.height;        if (gecko) //workaround for https://bugzilla.mozilla.org/show_bug.cgi?id=157846        {            //only fixed-width fonts have predictable padding added            wpTextbox1.style.fontFamily = "monospace";            wpTextbox0.style.fontFamily = "monospace";            wpTextbox0.style.fontSize = window.getComputedStyle(wpTextbox1).fontSize;            wpTextbox0.style.paddingLeft = "1px";            wpTextbox0.style.paddingRight = "1px";        }        else if (presto) //workaround for Opera        {            //wpTextbox0 must allow arbitrary scrolling on Opera (see above), so wpTextbox1 must also be given a horizontal scrollbar            //also, if overflowX is auto then when the window is resized the standard line breaking algorithm is not followed            wpTextbox1.style.overflowX = "scroll";        }        textboxContainer.style.position = "relative";        wpTextbox1.parentNode.insertBefore(textboxContainer, wpTextbox1);        textboxContainer.appendChild(wpTextbox1);        textboxContainer.appendChild(wpTextbox0);        //fix drop-downs in editing toolbar        $('.tool-select *').css({zIndex: 5});        document.head.appendChild(syntaxStyleElement);        wpTextbox1.addEventListener("input", highlightSyntax);        wpTextbox1.addEventListener("scroll", syncScrollX);        wpTextbox1.addEventListener("scroll", syncScrollY);        highlightSyntaxIfNeededIntervalID = setInterval(highlightSyntaxIfNeeded, 500);        highlightSyntax;    }    function queueSetup    {        setTimeout(setup, 0);    }    //enable the highlighter only when editing wikitext pages    //in the future a separate parser could be added for CSS and JS pages    //blacklist Internet Explorer, it's just too broken    if ((wgAction == "edit" || wgAction == "submit") && wgPageContentModel == "wikitext" && !trident)    {        /* The highlighter has to run after any other script (such as the           editing toolbar) that reparents wpTextbox1. We make sure that           everything else has run by waiting for the page to completely load           and then adding a call to the setup function to the end of the event           queue, so that the setup function runs after any other triggers set           on the load event. */        if (document.readyState == "complete")        {            queueSetup;        }        else        {            $(window).load(queueSetup);        }    } });