740 lines
21 KiB
JavaScript
740 lines
21 KiB
JavaScript
/*
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Syntax highlighting with language autodetection.
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https://highlightjs.org/
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*/
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(function(factory) {
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// Setup highlight.js for different environments. First is Node.js or
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// CommonJS.
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if(typeof exports !== 'undefined') {
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factory(exports);
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} else {
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// Export hljs globally even when using AMD for cases when this script
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// is loaded with others that may still expect a global hljs.
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window.hljs = factory({});
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// Finally register the global hljs with AMD.
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if(typeof define === 'function' && define.amd) {
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define([], function() {
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return window.hljs;
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});
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}
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}
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}(function(hljs) {
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/* Utility functions */
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function escape(value) {
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return value.replace(/&/gm, '&').replace(/</gm, '<').replace(/>/gm, '>');
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}
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function tag(node) {
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return node.nodeName.toLowerCase();
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}
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function testRe(re, lexeme) {
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var match = re && re.exec(lexeme);
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return match && match.index == 0;
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}
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function blockLanguage(block) {
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var classes = (block.className + ' ' + (block.parentNode ? block.parentNode.className : '')).split(/\s+/);
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classes = classes.map(function(c) {return c.replace(/^lang(uage)?-/, '');});
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return classes.filter(function(c) {return getLanguage(c) || /no(-?)highlight|plain|text/.test(c);})[0];
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}
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function inherit(parent, obj) {
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var result = {};
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for (var key in parent)
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result[key] = parent[key];
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if (obj)
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for (var key in obj)
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result[key] = obj[key];
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return result;
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};
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/* Stream merging */
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function nodeStream(node) {
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var result = [];
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(function _nodeStream(node, offset) {
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for (var child = node.firstChild; child; child = child.nextSibling) {
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if (child.nodeType == 3)
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offset += child.nodeValue.length;
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else if (child.nodeType == 1) {
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result.push({
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event: 'start',
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offset: offset,
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node: child
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});
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offset = _nodeStream(child, offset);
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// Prevent void elements from having an end tag that would actually
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// double them in the output. There are more void elements in HTML
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// but we list only those realistically expected in code display.
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if (!tag(child).match(/br|hr|img|input/)) {
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result.push({
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event: 'stop',
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offset: offset,
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node: child
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});
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}
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}
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}
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return offset;
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})(node, 0);
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return result;
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}
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function mergeStreams(original, highlighted, value) {
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var processed = 0;
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var result = '';
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var nodeStack = [];
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function selectStream() {
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if (!original.length || !highlighted.length) {
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return original.length ? original : highlighted;
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}
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if (original[0].offset != highlighted[0].offset) {
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return (original[0].offset < highlighted[0].offset) ? original : highlighted;
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}
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/*
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To avoid starting the stream just before it should stop the order is
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ensured that original always starts first and closes last:
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if (event1 == 'start' && event2 == 'start')
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return original;
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if (event1 == 'start' && event2 == 'stop')
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return highlighted;
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if (event1 == 'stop' && event2 == 'start')
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return original;
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if (event1 == 'stop' && event2 == 'stop')
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return highlighted;
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... which is collapsed to:
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*/
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return highlighted[0].event == 'start' ? original : highlighted;
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}
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function open(node) {
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function attr_str(a) {return ' ' + a.nodeName + '="' + escape(a.value) + '"';}
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result += '<' + tag(node) + Array.prototype.map.call(node.attributes, attr_str).join('') + '>';
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}
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function close(node) {
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result += '</' + tag(node) + '>';
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}
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function render(event) {
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(event.event == 'start' ? open : close)(event.node);
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}
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while (original.length || highlighted.length) {
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var stream = selectStream();
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result += escape(value.substr(processed, stream[0].offset - processed));
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processed = stream[0].offset;
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if (stream == original) {
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/*
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On any opening or closing tag of the original markup we first close
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the entire highlighted node stack, then render the original tag along
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with all the following original tags at the same offset and then
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reopen all the tags on the highlighted stack.
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*/
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nodeStack.reverse().forEach(close);
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do {
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render(stream.splice(0, 1)[0]);
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stream = selectStream();
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} while (stream == original && stream.length && stream[0].offset == processed);
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nodeStack.reverse().forEach(open);
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} else {
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if (stream[0].event == 'start') {
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nodeStack.push(stream[0].node);
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} else {
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nodeStack.pop();
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}
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render(stream.splice(0, 1)[0]);
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}
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}
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return result + escape(value.substr(processed));
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}
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/* Initialization */
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function compileLanguage(language) {
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function reStr(re) {
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return (re && re.source) || re;
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}
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function langRe(value, global) {
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return RegExp(
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reStr(value),
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'm' + (language.case_insensitive ? 'i' : '') + (global ? 'g' : '')
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);
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}
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function compileMode(mode, parent) {
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if (mode.compiled)
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return;
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mode.compiled = true;
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mode.keywords = mode.keywords || mode.beginKeywords;
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if (mode.keywords) {
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var compiled_keywords = {};
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var flatten = function(className, str) {
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if (language.case_insensitive) {
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str = str.toLowerCase();
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}
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str.split(' ').forEach(function(kw) {
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var pair = kw.split('|');
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compiled_keywords[pair[0]] = [className, pair[1] ? Number(pair[1]) : 1];
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});
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};
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if (typeof mode.keywords == 'string') { // string
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flatten('keyword', mode.keywords);
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} else {
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Object.keys(mode.keywords).forEach(function (className) {
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flatten(className, mode.keywords[className]);
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});
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}
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mode.keywords = compiled_keywords;
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}
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mode.lexemesRe = langRe(mode.lexemes || /\b\w+\b/, true);
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if (parent) {
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if (mode.beginKeywords) {
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mode.begin = '\\b(' + mode.beginKeywords.split(' ').join('|') + ')\\b';
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}
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if (!mode.begin)
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mode.begin = /\B|\b/;
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mode.beginRe = langRe(mode.begin);
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if (!mode.end && !mode.endsWithParent)
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mode.end = /\B|\b/;
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if (mode.end)
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mode.endRe = langRe(mode.end);
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mode.terminator_end = reStr(mode.end) || '';
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if (mode.endsWithParent && parent.terminator_end)
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mode.terminator_end += (mode.end ? '|' : '') + parent.terminator_end;
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}
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if (mode.illegal)
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mode.illegalRe = langRe(mode.illegal);
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if (mode.relevance === undefined)
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mode.relevance = 1;
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if (!mode.contains) {
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mode.contains = [];
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}
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var expanded_contains = [];
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mode.contains.forEach(function(c) {
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if (c.variants) {
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c.variants.forEach(function(v) {expanded_contains.push(inherit(c, v));});
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} else {
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expanded_contains.push(c == 'self' ? mode : c);
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}
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});
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mode.contains = expanded_contains;
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mode.contains.forEach(function(c) {compileMode(c, mode);});
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if (mode.starts) {
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compileMode(mode.starts, parent);
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}
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var terminators =
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mode.contains.map(function(c) {
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return c.beginKeywords ? '\\.?(' + c.begin + ')\\.?' : c.begin;
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})
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.concat([mode.terminator_end, mode.illegal])
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.map(reStr)
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.filter(Boolean);
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mode.terminators = terminators.length ? langRe(terminators.join('|'), true) : {exec: function(s) {return null;}};
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}
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compileMode(language);
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}
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/*
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Core highlighting function. Accepts a language name, or an alias, and a
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string with the code to highlight. Returns an object with the following
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properties:
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- relevance (int)
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- value (an HTML string with highlighting markup)
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*/
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function highlight(name, value, ignore_illegals, continuation) {
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function subMode(lexeme, mode) {
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for (var i = 0; i < mode.contains.length; i++) {
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if (testRe(mode.contains[i].beginRe, lexeme)) {
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return mode.contains[i];
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}
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}
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}
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function endOfMode(mode, lexeme) {
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if (testRe(mode.endRe, lexeme)) {
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return mode;
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}
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if (mode.endsWithParent) {
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return endOfMode(mode.parent, lexeme);
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}
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}
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function isIllegal(lexeme, mode) {
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return !ignore_illegals && testRe(mode.illegalRe, lexeme);
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}
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function keywordMatch(mode, match) {
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var match_str = language.case_insensitive ? match[0].toLowerCase() : match[0];
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return mode.keywords.hasOwnProperty(match_str) && mode.keywords[match_str];
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}
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function buildSpan(classname, insideSpan, leaveOpen, noPrefix) {
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var classPrefix = noPrefix ? '' : options.classPrefix,
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openSpan = '<span class="' + classPrefix,
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closeSpan = leaveOpen ? '' : '</span>';
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openSpan += classname + '">';
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return openSpan + insideSpan + closeSpan;
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}
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function processKeywords() {
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if (!top.keywords)
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return escape(mode_buffer);
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var result = '';
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var last_index = 0;
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top.lexemesRe.lastIndex = 0;
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var match = top.lexemesRe.exec(mode_buffer);
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while (match) {
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result += escape(mode_buffer.substr(last_index, match.index - last_index));
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var keyword_match = keywordMatch(top, match);
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if (keyword_match) {
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relevance += keyword_match[1];
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result += buildSpan(keyword_match[0], escape(match[0]));
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} else {
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result += escape(match[0]);
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}
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last_index = top.lexemesRe.lastIndex;
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match = top.lexemesRe.exec(mode_buffer);
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}
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return result + escape(mode_buffer.substr(last_index));
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}
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function processSubLanguage() {
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if (top.subLanguage && !languages[top.subLanguage]) {
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return escape(mode_buffer);
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}
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var result = top.subLanguage ? highlight(top.subLanguage, mode_buffer, true, continuations[top.subLanguage]) : highlightAuto(mode_buffer);
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// Counting embedded language score towards the host language may be disabled
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// with zeroing the containing mode relevance. Usecase in point is Markdown that
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// allows XML everywhere and makes every XML snippet to have a much larger Markdown
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// score.
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if (top.relevance > 0) {
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relevance += result.relevance;
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}
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if (top.subLanguageMode == 'continuous') {
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continuations[top.subLanguage] = result.top;
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}
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return buildSpan(result.language, result.value, false, true);
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}
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function processBuffer() {
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return top.subLanguage !== undefined ? processSubLanguage() : processKeywords();
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}
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function startNewMode(mode, lexeme) {
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var markup = mode.className? buildSpan(mode.className, '', true): '';
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if (mode.returnBegin) {
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result += markup;
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mode_buffer = '';
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} else if (mode.excludeBegin) {
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result += escape(lexeme) + markup;
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mode_buffer = '';
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} else {
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result += markup;
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mode_buffer = lexeme;
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}
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top = Object.create(mode, {parent: {value: top}});
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}
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function processLexeme(buffer, lexeme) {
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mode_buffer += buffer;
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if (lexeme === undefined) {
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result += processBuffer();
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return 0;
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}
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var new_mode = subMode(lexeme, top);
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if (new_mode) {
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result += processBuffer();
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startNewMode(new_mode, lexeme);
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return new_mode.returnBegin ? 0 : lexeme.length;
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}
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var end_mode = endOfMode(top, lexeme);
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if (end_mode) {
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var origin = top;
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if (!(origin.returnEnd || origin.excludeEnd)) {
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mode_buffer += lexeme;
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}
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result += processBuffer();
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do {
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if (top.className) {
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result += '</span>';
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}
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relevance += top.relevance;
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top = top.parent;
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} while (top != end_mode.parent);
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if (origin.excludeEnd) {
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result += escape(lexeme);
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}
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mode_buffer = '';
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if (end_mode.starts) {
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startNewMode(end_mode.starts, '');
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}
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return origin.returnEnd ? 0 : lexeme.length;
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}
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if (isIllegal(lexeme, top))
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throw new Error('Illegal lexeme "' + lexeme + '" for mode "' + (top.className || '<unnamed>') + '"');
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/*
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Parser should not reach this point as all types of lexemes should be caught
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earlier, but if it does due to some bug make sure it advances at least one
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character forward to prevent infinite looping.
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*/
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mode_buffer += lexeme;
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return lexeme.length || 1;
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}
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var language = getLanguage(name);
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if (!language) {
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throw new Error('Unknown language: "' + name + '"');
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}
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compileLanguage(language);
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var top = continuation || language;
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var continuations = {}; // keep continuations for sub-languages
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var result = '';
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for(var current = top; current != language; current = current.parent) {
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if (current.className) {
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result = buildSpan(current.className, '', true) + result;
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}
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}
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var mode_buffer = '';
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var relevance = 0;
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try {
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var match, count, index = 0;
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while (true) {
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top.terminators.lastIndex = index;
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match = top.terminators.exec(value);
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if (!match)
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break;
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count = processLexeme(value.substr(index, match.index - index), match[0]);
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index = match.index + count;
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}
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processLexeme(value.substr(index));
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for(var current = top; current.parent; current = current.parent) { // close dangling modes
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if (current.className) {
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result += '</span>';
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}
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};
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return {
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relevance: relevance,
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value: result,
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language: name,
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top: top
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};
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} catch (e) {
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if (e.message.indexOf('Illegal') != -1) {
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return {
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relevance: 0,
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value: escape(value)
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};
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} else {
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throw e;
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}
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}
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}
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/*
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Highlighting with language detection. Accepts a string with the code to
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highlight. Returns an object with the following properties:
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- language (detected language)
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- relevance (int)
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- value (an HTML string with highlighting markup)
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- second_best (object with the same structure for second-best heuristically
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detected language, may be absent)
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*/
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function highlightAuto(text, languageSubset) {
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languageSubset = languageSubset || options.languages || Object.keys(languages);
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var result = {
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relevance: 0,
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value: escape(text)
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};
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var second_best = result;
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languageSubset.forEach(function(name) {
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if (!getLanguage(name)) {
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return;
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}
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var current = highlight(name, text, false);
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current.language = name;
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if (current.relevance > second_best.relevance) {
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second_best = current;
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}
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if (current.relevance > result.relevance) {
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second_best = result;
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result = current;
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}
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});
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if (second_best.language) {
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result.second_best = second_best;
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}
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return result;
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}
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/*
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Post-processing of the highlighted markup:
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- replace TABs with something more useful
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- replace real line-breaks with '<br>' for non-pre containers
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*/
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function fixMarkup(value) {
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if (options.tabReplace) {
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value = value.replace(/^((<[^>]+>|\t)+)/gm, function(match, p1, offset, s) {
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return p1.replace(/\t/g, options.tabReplace);
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});
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}
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if (options.useBR) {
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value = value.replace(/\n/g, '<br>');
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}
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return value;
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}
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function buildClassName(prevClassName, currentLang, resultLang) {
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var language = currentLang ? aliases[currentLang] : resultLang,
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result = [prevClassName.trim()];
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if (!prevClassName.match(/\bhljs\b/)) {
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result.push('hljs');
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}
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if (language) {
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result.push(language);
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}
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return result.join(' ').trim();
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}
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/*
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Applies highlighting to a DOM node containing code. Accepts a DOM node and
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two optional parameters for fixMarkup.
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*/
|
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function highlightBlock(block) {
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var language = blockLanguage(block);
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if (/no(-?)highlight|plain|text/.test(language))
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return;
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var node;
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if (options.useBR) {
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node = document.createElementNS('http://www.w3.org/1999/xhtml', 'div');
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node.innerHTML = block.innerHTML.replace(/\n/g, '').replace(/<br[ \/]*>/g, '\n');
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} else {
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node = block;
|
|
}
|
|
var text = node.textContent;
|
|
var result = language ? highlight(language, text, true) : highlightAuto(text);
|
|
|
|
var originalStream = nodeStream(node);
|
|
if (originalStream.length) {
|
|
var resultNode = document.createElementNS('http://www.w3.org/1999/xhtml', 'div');
|
|
resultNode.innerHTML = result.value;
|
|
result.value = mergeStreams(originalStream, nodeStream(resultNode), text);
|
|
}
|
|
result.value = fixMarkup(result.value);
|
|
|
|
block.innerHTML = result.value;
|
|
block.className = buildClassName(block.className, language, result.language);
|
|
block.result = {
|
|
language: result.language,
|
|
re: result.relevance
|
|
};
|
|
if (result.second_best) {
|
|
block.second_best = {
|
|
language: result.second_best.language,
|
|
re: result.second_best.relevance
|
|
};
|
|
}
|
|
}
|
|
|
|
var options = {
|
|
classPrefix: 'hljs-',
|
|
tabReplace: null,
|
|
useBR: false,
|
|
languages: undefined
|
|
};
|
|
|
|
/*
|
|
Updates highlight.js global options with values passed in the form of an object
|
|
*/
|
|
function configure(user_options) {
|
|
options = inherit(options, user_options);
|
|
}
|
|
|
|
/*
|
|
Applies highlighting to all <pre><code>..</code></pre> blocks on a page.
|
|
*/
|
|
function initHighlighting() {
|
|
if (initHighlighting.called)
|
|
return;
|
|
initHighlighting.called = true;
|
|
|
|
var blocks = document.querySelectorAll('pre code');
|
|
Array.prototype.forEach.call(blocks, highlightBlock);
|
|
}
|
|
|
|
/*
|
|
Attaches highlighting to the page load event.
|
|
*/
|
|
function initHighlightingOnLoad() {
|
|
addEventListener('DOMContentLoaded', initHighlighting, false);
|
|
addEventListener('load', initHighlighting, false);
|
|
}
|
|
|
|
var languages = {};
|
|
var aliases = {};
|
|
|
|
function registerLanguage(name, language) {
|
|
var lang = languages[name] = language(hljs);
|
|
if (lang.aliases) {
|
|
lang.aliases.forEach(function(alias) {aliases[alias] = name;});
|
|
}
|
|
}
|
|
|
|
function listLanguages() {
|
|
return Object.keys(languages);
|
|
}
|
|
|
|
function getLanguage(name) {
|
|
return languages[name] || languages[aliases[name]];
|
|
}
|
|
|
|
/* Interface definition */
|
|
|
|
hljs.highlight = highlight;
|
|
hljs.highlightAuto = highlightAuto;
|
|
hljs.fixMarkup = fixMarkup;
|
|
hljs.highlightBlock = highlightBlock;
|
|
hljs.configure = configure;
|
|
hljs.initHighlighting = initHighlighting;
|
|
hljs.initHighlightingOnLoad = initHighlightingOnLoad;
|
|
hljs.registerLanguage = registerLanguage;
|
|
hljs.listLanguages = listLanguages;
|
|
hljs.getLanguage = getLanguage;
|
|
hljs.inherit = inherit;
|
|
|
|
// Common regexps
|
|
hljs.IDENT_RE = '[a-zA-Z]\\w*';
|
|
hljs.UNDERSCORE_IDENT_RE = '[a-zA-Z_]\\w*';
|
|
hljs.NUMBER_RE = '\\b\\d+(\\.\\d+)?';
|
|
hljs.C_NUMBER_RE = '\\b(0[xX][a-fA-F0-9]+|(\\d+(\\.\\d*)?|\\.\\d+)([eE][-+]?\\d+)?)'; // 0x..., 0..., decimal, float
|
|
hljs.BINARY_NUMBER_RE = '\\b(0b[01]+)'; // 0b...
|
|
hljs.RE_STARTERS_RE = '!|!=|!==|%|%=|&|&&|&=|\\*|\\*=|\\+|\\+=|,|-|-=|/=|/|:|;|<<|<<=|<=|<|===|==|=|>>>=|>>=|>=|>>>|>>|>|\\?|\\[|\\{|\\(|\\^|\\^=|\\||\\|=|\\|\\||~';
|
|
|
|
// Common modes
|
|
hljs.BACKSLASH_ESCAPE = {
|
|
begin: '\\\\[\\s\\S]', relevance: 0
|
|
};
|
|
hljs.APOS_STRING_MODE = {
|
|
className: 'string',
|
|
begin: '\'', end: '\'',
|
|
illegal: '\\n',
|
|
contains: [hljs.BACKSLASH_ESCAPE]
|
|
};
|
|
hljs.QUOTE_STRING_MODE = {
|
|
className: 'string',
|
|
begin: '"', end: '"',
|
|
illegal: '\\n',
|
|
contains: [hljs.BACKSLASH_ESCAPE]
|
|
};
|
|
hljs.PHRASAL_WORDS_MODE = {
|
|
begin: /\b(a|an|the|are|I|I'm|isn't|don't|doesn't|won't|but|just|should|pretty|simply|enough|gonna|going|wtf|so|such)\b/
|
|
};
|
|
hljs.C_LINE_COMMENT_MODE = {
|
|
className: 'comment',
|
|
begin: '//', end: '$',
|
|
contains: [hljs.PHRASAL_WORDS_MODE]
|
|
};
|
|
hljs.C_BLOCK_COMMENT_MODE = {
|
|
className: 'comment',
|
|
begin: '/\\*', end: '\\*/',
|
|
contains: [hljs.PHRASAL_WORDS_MODE]
|
|
};
|
|
hljs.HASH_COMMENT_MODE = {
|
|
className: 'comment',
|
|
begin: '#', end: '$',
|
|
contains: [hljs.PHRASAL_WORDS_MODE]
|
|
};
|
|
hljs.NUMBER_MODE = {
|
|
className: 'number',
|
|
begin: hljs.NUMBER_RE,
|
|
relevance: 0
|
|
};
|
|
hljs.C_NUMBER_MODE = {
|
|
className: 'number',
|
|
begin: hljs.C_NUMBER_RE,
|
|
relevance: 0
|
|
};
|
|
hljs.BINARY_NUMBER_MODE = {
|
|
className: 'number',
|
|
begin: hljs.BINARY_NUMBER_RE,
|
|
relevance: 0
|
|
};
|
|
hljs.CSS_NUMBER_MODE = {
|
|
className: 'number',
|
|
begin: hljs.NUMBER_RE + '(' +
|
|
'%|em|ex|ch|rem' +
|
|
'|vw|vh|vmin|vmax' +
|
|
'|cm|mm|in|pt|pc|px' +
|
|
'|deg|grad|rad|turn' +
|
|
'|s|ms' +
|
|
'|Hz|kHz' +
|
|
'|dpi|dpcm|dppx' +
|
|
')?',
|
|
relevance: 0
|
|
};
|
|
hljs.REGEXP_MODE = {
|
|
className: 'regexp',
|
|
begin: /\//, end: /\/[gimuy]*/,
|
|
illegal: /\n/,
|
|
contains: [
|
|
hljs.BACKSLASH_ESCAPE,
|
|
{
|
|
begin: /\[/, end: /\]/,
|
|
relevance: 0,
|
|
contains: [hljs.BACKSLASH_ESCAPE]
|
|
}
|
|
]
|
|
};
|
|
hljs.TITLE_MODE = {
|
|
className: 'title',
|
|
begin: hljs.IDENT_RE,
|
|
relevance: 0
|
|
};
|
|
hljs.UNDERSCORE_TITLE_MODE = {
|
|
className: 'title',
|
|
begin: hljs.UNDERSCORE_IDENT_RE,
|
|
relevance: 0
|
|
};
|
|
|
|
return hljs;
|
|
}));
|