User:DZ/Syntax highlighter.js

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

/* This file may be used under the terms of any of the following licenses, as well as any later version of the same licenses:

GNU General Public License 2.0 

Creative Commons Attribution-ShareAlike 3.0 Unported License 

GNU Free Documentation License 1.2 

(function {    "use strict";

//variables that are preserved between function calls 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; var attributeObserver; var parentObserver;

/* 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.

Supported 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 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).

Newlines are sucked up into ending tokens (including comments, bare      external links, lists, horizontal lines, signatures, entities, etc.) to       avoid creating spans with nothing but newlines in them.

Flags: g for global search, m for make ^ match the beginning of each line and $ the end of each line */   var wgUrlProtocols = mw.config.get("wgUrlProtocols"); var entityRegexBase = "&(?:(?: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]+);\n*"; var breakerRegexBase = "\\[(?:\\[|(?:" + wgUrlProtocols + "))|\\{(?:\\{\\{?|\\|)|<(?:[: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]*(?=/?>| |\n)|!--[^]*?-->\n*)|(?:" + wgUrlProtocols.replace("|\\/\\/", "") + ")[^\\s\"<>[\\]{-}]*[^\\s\",\\.:;<>[\\]{-}]\n*|^(?:=|[*#:;]+\n*|-{4,}\n*)|\\\\'\\\\'(?:\\\\')?|~{3,5}\n*|" + entityRegexBase; function breakerRegexWithPrefix(prefix) {       //the stop token has to be at the beginning of the regex so that it takes precedence over substrings of itself. return new RegExp("(" + prefix + ")\n*|" + breakerRegexBase, "gm"); }   function nowikiTagBreakerRegex(tagName) {       return new RegExp("()\n*|" + entityRegexBase, "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         = {}; var nowikiTagBreakerRegexCache   = {};

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;

//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) {           //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; }

/* About assumedBold and assumedItalic:

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.

To permit The best book ever, assumedBold and assumedItalic are saved on the stack and reset to          undefined (essentially, false) when recursing into a new block. */

function highlightBlock(color, breakerRegex, assumedBold, assumedItalic) {           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) == "/" || match[0].substring(1) == "br" ) {                               //empty tag writeText(text.substring(i - match[0].length, tagEnd), syntaxHighlighterConfig.tagColor || color); i = tagEnd; }                           else {                               var tagName = match[0].substring(1);

if (syntaxHighlighterConfig.sourceTags.indexOf(tagName) != -1) {                                   //tag that contains text in a different programming language 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 if (syntaxHighlighterConfig.nowikiTags.indexOf(tagName) != -1) {                                   //tag that can contain only HTML entities writeText(text.substring(i - match[0].length, tagEnd), syntaxHighlighterConfig.tagColor || color); i = tagEnd; highlightBlock(syntaxHighlighterConfig.tagColor || color, nowikiTagBreakerRegexCache[tagName]); }                               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 "=": 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 if (assumedItalic) {                                   //end of bold part of bold-italic block //block is now italic-only assumedBold = false; }                               else {                                   //end of bold block return; }                           }                            else {                               //start tag if (assumedItalic) {                                   //start of bold part of previously italic-only block //block is now bold-italic assumedBold = true; }                               else {                                   //start of bold block highlightBlock(syntaxHighlighterConfig.boldOrItalicColor || color, defaultBreakerRegex, true, false); }                           }                        }                        else {                           //italic if (assumedItalic) {                               //end tag if (assumedBold) {                                   //end of italic part of bold-italic block //block is now bold-only assumedItalic = false; }                               else {                                   //end of italic block return; }                           }                            else {                               //start tag if (assumedBold) {                                   //start of italic part of previously bold-only block //block is now bold-italic assumedItalic = true; }                               else {                                   //start of italic block highlightBlock(syntaxHighlighterConfig.boldOrItalicColor || color, defaultBreakerRegex, false, true); }                           }                        }                        break; case "&": //entity writeText(match[0], syntaxHighlighterConfig.entityColor || color); break; case "~": //username, signature, timestamp writeText(match[0], syntaxHighlighterConfig.signatureColor || color); break; default: //bare external link writeText(match[0], syntaxHighlighterConfig.externalLinkColor || 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), ""); }

//if highlighting took too long, disable it. var endTime = Date.now; /*if (typeof(bestTime) == "undefined") {           window.bestTime = endTime - startTime; document.title = bestTime; highlightSyntaxIfNeededIntervalID = setInterval(highlightSyntax, 250); }       else {           if (endTime - startTime < bestTime) {               bestTime = endTime - startTime; document.title = bestTime; }       }//*/        if (endTime - startTime > syntaxHighlighterConfig.timeout) {           clearInterval(highlightSyntaxIfNeededIntervalID); wpTextbox1.removeEventListener("input", highlightSyntax); wpTextbox1.removeEventListener("scroll", syncScrollX); wpTextbox1.removeEventListener("scroll", syncScrollY); attributeObserver.disconnect; parentObserver.disconnect; syntaxStyleTextNode.nodeValue = "";

var errorMessage = { ca: "S'ha desactivat el remarcar de sintaxi en aquesta pàgina perquè ha trigat massa temps. El temps màxim permès per a remarcar és $1ms, i el vostre ordinador ha trigat $2ms. Proveu tancar algunes pestanyes i programes i fer clic en \"Mostra la previsualització\" o \"Mostra els canvis\". Si no funciona això, proveu un altre navegador web, i si això no funciona, proveu un ordinador més ràpid.", de: "Die Syntaxhervorhebung wurde auf dieser Seite deaktiviert, da diese zu lange gedauert hat. Die maximal erlaubte Zeit zur Hervorhebung beträgt $1ms und dein Computer benötigte $2ms. Versuche einige Tabs und Programme zu schließen und klicke \"Vorschau zeigen\" oder \"Änderungen zeigen\". Wenn das nicht funktioniert, probiere einen anderen Webbrowser und wenn immer noch nicht, probiere einen schnelleren Computer.", el: "Η έμφαση σύνταξης έχει απενεργοποιηθεί σε αυτήν τη σελίδα γιατί αργούσε πολύ. Ο μέγιστος επιτρεπτός χρόνος για την έμφαση σύνταξης είναι $1ms και ο υπολογιστής σας έκανε $2ms. Δοκιμάστε να κλείσετε μερικές καρτέλες και προγράμματα και να κάνετε κλικ στην «Εμφάνιση προεπισκόπησης» ή στην «Εμφάνιση αλλαγών». Αν αυτό δεν δουλέψει, δοκιμάστε έναν διαφορετικό περιηγητή και αν ούτε αυτό δουλέψει, δοκιμάστε έναν ταχύτερο υπολογιστή.", 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.", es: "Se desactivó el resaltar de sintaxis en esta página porque tardó demasiado. El tiempo máximo 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.", fa: "از آنجایی که زمان زیادی صرف آن می‌شد، برجسته‌سازی نحو در این صفحه غیرفعال شده است. بیشینهٔ زمان برجسته‌سازی برای ابزار $1ms تعریف شده در حالی که رایانهٔ شما $2ms زمان نیاز داشت. می‌توانید بستن برخی سربرگ‌ها و برنامه‌ها و سپس کلیک‌کردن دکمهٔ «پیش‌نمایش» یا «نمایش تغییرات» را بیازمایید. اگر جواب نداد مرورگر دیگری را امتحان کنید؛ و اگر باز هم جواب نداد، رایانهٔ سریع‌تری را بیازمایید.", fr: "La coloration syntaxique a été désactivée sur cette page en raison d'un temps de chargement trop important ($2ms). Le temps maximum autorisé est $1ms. Vous pouvez essayer de fermer certains onglets et programmes et cliquez sur \"Prévisualisation\" ou \"Voir mes modifications\". Si cela ne fonctionne pas, essayez un autre navigateur web, et si cela ne fonctionne toujours pas, essayez un ordinateur plus rapide.", hy: "Շարադասության ընդգծումը այս էջում անջատվել է, քանի որ այն չափից շատ է տևել։ Ընդգծման թույլատրելի առավելագույն ժամանակը $1 միլիվայրկյան է, բայց այս էջում տևել է $2 միլիվայրկյան։ Փորձեք անջատել որոշ ներդիրներ կամ ծրագրեր և սեղմել «Նախադիտել» կամ «Կատարված փոփոխությունները»։ Կրկին չաշխատելու դեպքում փորձեք այլ վեբ դիտարկիչ, եթե կրկին չաշխատի, փորձեք ավելի արագ համակարգիչ։", 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.", it: "L'evidenziazione delle sintassi su questa pagina è stata disabilitata perché ha richiesto troppo tempo. Il tempo massimo per l'evidenziazione è di $1ms e al tuo computer sono serviti $2ms. Prova a chiudere alcune schede e programmi e ricarica la pagina cliccando su \"Visualizza anteprima\" o \"Mostra modifiche\". Se non funziona ancora, prova con un web browser differente e, in ultima alternativa, prova ad utilizzare un computer più veloce.", ko: "이 문서에서의 문법 강조가 너무 오래 걸러서 해제되었습니다. 최대로 할당된 강조 시간은 $1ms인데, 당신의 컴퓨터는 $2ms이나 걸렸습니다. 탭과 프로그램을 일부 닫으신 후에 \"미리 보기\"나 \"차이 보기\"를 클릭하시기 바랍니다. 만약 작동하지 않으면 다른 웹 브라우저로 시도해보시고, 그래도 안되면 더 빠른 컴퓨터를 이용하십시오", pt: "O marcador de sintaxe foi desativado nesta página porque demorou demais. O tempo máximo permitido para marcar é de $1ms, e seu computador demorou $2ms. Tente fechar algumas abas e programas e clique em \"Mostrar previsão\" ou \"Mostrar alterações\". Se isso não funcionar, tente usar um outro navegador web, e se ainda não funcionar, tente em um computador mais rápido.", ru: "Подсветка синтаксиса на странице была отключена, так как заняла слишком долго. Максимальное допустимое время операции - $1мс, сейчас на вашем компьютере она заняла $2мс. Попробуйте закрыть несколько вкладок и программ, затем нажать «Предварительный просмотр» или «Внесённые изменения». Если это не поможет, попробуйте другой браузер; если и это не поможет, используйте более быстрый компьютер.", };           var wgUserLanguage = mw.config.get("wgUserLanguage");

errorMessage = errorMessage[wgUserLanguage] || errorMessage[wgUserLanguage.substring(0, wgUserLanguage.indexOf("-"))] || errorMessage.en;

wpTextbox1.style.backgroundColor = ""; wpTextbox1.style.marginTop = wpTextbox0.style.marginTop; wpTextbox0.removeAttribute("dir"); wpTextbox0.removeAttribute("lang"); wpTextbox0.setAttribute("style", "color:red; font-size:small");

wpTextbox0.textContent = errorMessage.replace("$1", syntaxHighlighterConfig.timeout).replace("$2", endTime - startTime); return; }

//do we have enough span elements to match the generated CSS? //this step isn't included in the above benchmark because it takes a highly variable amount of time if (maxSpanNumber < spanNumber) {           var fragment = document.createDocumentFragment; do           { fragment.appendChild(document.createElement("span")).id = "s" + ++maxSpanNumber; }           while (maxSpanNumber < spanNumber); wpTextbox0.appendChild(fragment); }

/* 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 ") + "'}"; }

function syncScrollX {       wpTextbox0.scrollLeft = wpTextbox1.scrollLeft; }

function syncScrollY {       wpTextbox0.scrollTop = wpTextbox1.scrollTop; }

function syncTextDirection {       wpTextbox0.dir = wpTextbox1.dir; }

function syncParent {       if (wpTextbox1.previousSibling != wpTextbox0) {           wpTextbox1.parentNode.insertBefore(wpTextbox0, wpTextbox1); parentObserver.disconnect; parentObserver.observe(wpTextbox1.parentNode, {childList: true}); }   }

//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; }       if (wpTextbox1.offsetHeight != wpTextbox0.offsetHeight) {           var height = wpTextbox1.offsetHeight + "px"; wpTextbox0.style.height = height; wpTextbox1.style.marginTop = "-" + height; }   }

function setup {       function configureColor(parameterName, hardcodedFallback) {           if (typeof(syntaxHighlighterConfig[parameterName]) == "undefined") {               syntaxHighlighterConfig[parameterName] = syntaxHighlighterSiteConfig[parameterName]; }

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.syntaxHighlighterSiteConfig = window.syntaxHighlighterSiteConfig || {}; 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

//tag lists are ordered from most common to least common syntaxHighlighterConfig.nowikiTags = syntaxHighlighterConfig.nowikiTags || syntaxHighlighterSiteConfig.nowikiTags || ["nowiki", "pre"]; syntaxHighlighterConfig.sourceTags = syntaxHighlighterConfig.sourceTags || syntaxHighlighterSiteConfig.sourceTags || ["math", "syntaxhighlight", "source", "timeline", "hiero"]; syntaxHighlighterConfig.timeout = syntaxHighlighterConfig.timeout || syntaxHighlighterSiteConfig.timeout || 50;

syntaxHighlighterConfig.nowikiTags.forEach(function(tagName) {           nowikiTagBreakerRegexCache[tagName] = nowikiTagBreakerRegex(tagName);        });

wpTextbox0 = document.createElement("div"); wpTextbox1 = document.getElementById("wpTextbox1");

var syntaxStyleElement = document.createElement("style"); syntaxStyleTextNode = syntaxStyleElement.appendChild(document.createTextNode(""));

//the styling of the textbox and the background div must be kept very similar var wpTextbox1Style = window.getComputedStyle(wpTextbox1);

//horizontal resize would look horribly choppy, better to make the user resize the browser window instead var resize = (wpTextbox1Style.resize == "vertical" || wpTextbox1Style.resize == "both" ? "vertical" : "none");

wpTextbox0.dir                  = wpTextbox1.dir; wpTextbox0.lang                 = wpTextbox1.lang; //lang determines which font "monospace" is        wpTextbox0.style.backgroundColor = wpTextbox1Style.backgroundColor; wpTextbox0.style.border         = "1px solid transparent"; wpTextbox0.style.boxSizing      = "border-box"; wpTextbox0.style.clear          = wpTextbox1Style.clear; wpTextbox0.style.color          = "transparent"; //makes it look just a little bit smoother wpTextbox0.style.fontFamily     = wpTextbox1Style.fontFamily; wpTextbox0.style.fontSize       = wpTextbox1Style.fontSize; wpTextbox0.style.lineHeight     = "normal"; wpTextbox0.style.marginBottom   = "0"; wpTextbox0.style.marginLeft     = "0"; wpTextbox0.style.marginRight    = "0"; wpTextbox0.style.marginTop      = wpTextbox1Style.marginTop; wpTextbox0.style.overflowX      = "auto"; wpTextbox0.style.overflowY      = "scroll"; wpTextbox0.style.resize         = resize; wpTextbox0.style.tabSize        = wpTextbox1Style.tabSize; 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.fontSize       = wpTextbox1Style.fontSize; //resolves alignment problems on mobile chrome wpTextbox1.style.lineHeight     = "normal"; wpTextbox1.style.marginBottom   = wpTextbox1Style.marginBottom; //lock to pixel value because the top margin was also locked to a pixel value when it was moved to wpTextbox0 wpTextbox1.style.marginLeft     = "0"; wpTextbox1.style.marginRight    = "0"; wpTextbox1.style.overflowX      = "auto"; wpTextbox1.style.overflowY      = "scroll"; wpTextbox1.style.padding        = "0"; wpTextbox1.style.resize         = resize; wpTextbox1.style.width          = "100%"; wpTextbox1.style.wordWrap       = "normal"; //overall more visually appealing

// https://bugzilla.mozilla.org/show_bug.cgi?id=1301290 if (layoutEngine == "gecko") {           wpTextbox0.style.isolation = "isolate"; wpTextbox1.style.isolation = "isolate"; }

//lock both heights to pixel values so that the browser zoom feature works better wpTextbox1.style.height = wpTextbox0.style.height = wpTextbox1.offsetHeight + "px";

//insert wpTextbox0 underneath wpTextbox1 wpTextbox1.style.marginTop      = -wpTextbox1.offsetHeight + "px"; wpTextbox1.parentNode.insertBefore(wpTextbox0, wpTextbox1);

document.head.appendChild(syntaxStyleElement);

wpTextbox1.addEventListener("input", highlightSyntax); wpTextbox1.addEventListener("scroll", syncScrollX); wpTextbox1.addEventListener("scroll", syncScrollY); attributeObserver = new MutationObserver(syncTextDirection); attributeObserver.observe(wpTextbox1, {attributes: true}); parentObserver = new MutationObserver(syncParent); parentObserver.observe(wpTextbox1.parentNode, {childList: true}); highlightSyntaxIfNeededIntervalID = setInterval(highlightSyntaxIfNeeded, 500); highlightSyntax; }

//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 and Edge, they're just too broken var wgAction = mw.config.get("wgAction"); var layoutEngine = $.client.profile.layout; if ((wgAction == "edit" || wgAction == "submit") && mw.config.get("wgPageContentModel") == "wikitext" && layoutEngine != "trident" && layoutEngine != "edge") {       //give other scripts an opportunity to set syntaxHighlighterConfig if (document.readyState == "complete") {           setup; }       else {           $(window).load(setup); }   } });