devdocs/assets/javascripts/vendor/prism.js

/**
 * Prism: Lightweight, robust, elegant syntax highlighting
 * MIT license http://www.opensource.org/licenses/mit-license.php/
 * @author Lea Verou http://lea.verou.me
 */

(function(){

// Private helper vars
var lang = /\blang(?:uage)?-(?!\*)(\w+)\b/i;

var _ = self.Prism = {
	util: {
		type: function (o) {
			return Object.prototype.toString.call(o).match(/\[object (\w+)\]/)[1];
		},

		// Deep clone a language definition (e.g. to extend it)
		clone: function (o) {
			var type = _.util.type(o);

			switch (type) {
				case 'Object':
					var clone = {};

					for (var key in o) {
						if (o.hasOwnProperty(key)) {
							clone[key] = _.util.clone(o[key]);
						}
					}

					return clone;

				case 'Array':
					return o.slice();
			}

			return o;
		}
	},

	languages: {
		extend: function (id, redef) {
			var lang = _.util.clone(_.languages[id]);

			for (var key in redef) {
				lang[key] = redef[key];
			}

			return lang;
		},

		// Insert a token before another token in a language literal
		insertBefore: function (inside, before, insert, root) {
			root = root || _.languages;
			var grammar = root[inside];
			var ret = {};

			for (var token in grammar) {

				if (grammar.hasOwnProperty(token)) {

					if (token == before) {

						for (var newToken in insert) {

							if (insert.hasOwnProperty(newToken)) {
								ret[newToken] = insert[newToken];
							}
						}
					}

					ret[token] = grammar[token];
				}
			}

			return root[inside] = ret;
		},

		// Traverse a language definition with Depth First Search
		DFS: function(o, callback) {
			for (var i in o) {
				callback.call(o, i, o[i]);

				if (_.util.type(o) === 'Object') {
					_.languages.DFS(o[i], callback);
				}
			}
		}
	},

	highlightAll: function(async, callback) {
		var elements = document.querySelectorAll('code[class*="language-"], [class*="language-"] code, code[class*="lang-"], [class*="lang-"] code');

		for (var i=0, element; element = elements[i++];) {
			_.highlightElement(element, async === true, callback);
		}
	},

	highlightElement: function(element, async, callback) {
		// Find language
		var language, grammar, parent = element;

		while (parent && !lang.test(parent.className)) {
			parent = parent.parentNode;
		}

		if (parent) {
			language = (parent.className.match(lang) || [,''])[1];
			grammar = _.languages[language];
		}

		if (!grammar) {
			return;
		}

		// Set language on the element, if not present
		element.className = element.className.replace(lang, '').replace(/\s+/g, ' ') + ' language-' + language;

		// Set language on the parent, for styling
		parent = element.parentNode;

		if (/pre/i.test(parent.nodeName)) {
			parent.className = parent.className.replace(lang, '').replace(/\s+/g, ' ') + ' language-' + language;
		}

		var code = element.textContent;

		if(!code) {
			return;
		}

		code = code.replace(/&/g, '&amp;').replace(/</g, '&lt;').replace(/\u00a0/g, ' ');

		var env = {
			element: element,
			language: language,
			grammar: grammar,
			code: code
		};

		_.hooks.run('before-highlight', env);

		// if (async && self.Worker) {
		// 	var worker = new Worker(_.filename);

		// 	worker.onmessage = function(evt) {
		// 		env.highlightedCode = Token.stringify(JSON.parse(evt.data), language);

		// 		_.hooks.run('before-insert', env);

		// 		env.element.innerHTML = env.highlightedCode;

		// 		callback && callback.call(env.element);
		// 		_.hooks.run('after-highlight', env);
		// 	};

		// 	worker.postMessage(JSON.stringify({
		// 		language: env.language,
		// 		code: env.code
		// 	}));
		// }
		// else {
			env.highlightedCode = _.highlight(env.code, env.grammar, env.language)

			_.hooks.run('before-insert', env);

			env.element.innerHTML = env.highlightedCode;

			callback && callback.call(element);

			_.hooks.run('after-highlight', env);
		// }
	},

	highlight: function (text, grammar, language) {
		return Token.stringify(_.tokenize(text, grammar), language);
	},

	tokenize: function(text, grammar, language) {
		var Token = _.Token;

		var strarr = [text];

		var rest = grammar.rest;

		if (rest) {
			for (var token in rest) {
				grammar[token] = rest[token];
			}

			delete grammar.rest;
		}

		tokenloop: for (var token in grammar) {
			if(!grammar.hasOwnProperty(token) || !grammar[token]) {
				continue;
			}

			var pattern = grammar[token],
				inside = pattern.inside,
				lookbehind = !!pattern.lookbehind,
				lookbehindLength = 0;

			pattern = pattern.pattern || pattern;

			for (var i=0; i<strarr.length; i++) { // Don’t cache length as it changes during the loop

				var str = strarr[i];

				if (strarr.length > text.length) {
					// Something went terribly wrong, ABORT, ABORT!
					break tokenloop;
				}

				if (str instanceof Token) {
					continue;
				}

				pattern.lastIndex = 0;

				var match = pattern.exec(str);

				if (match) {
					if(lookbehind) {
						lookbehindLength = match[1].length;
					}

					var from = match.index - 1 + lookbehindLength,
					    match = match[0].slice(lookbehindLength),
					    len = match.length,
					    to = from + len,
						before = str.slice(0, from + 1),
						after = str.slice(to + 1);

					var args = [i, 1];

					if (before) {
						args.push(before);
					}

					var wrapped = new Token(token, inside? _.tokenize(match, inside) : match);

					args.push(wrapped);

					if (after) {
						args.push(after);
					}

					Array.prototype.splice.apply(strarr, args);
				}
			}
		}

		return strarr;
	},

	hooks: {
		all: {},

		add: function (name, callback) {
			var hooks = _.hooks.all;

			hooks[name] = hooks[name] || [];

			hooks[name].push(callback);
		},

		run: function (name, env) {
			var callbacks = _.hooks.all[name];

			if (!callbacks || !callbacks.length) {
				return;
			}

			for (var i=0, callback; callback = callbacks[i++];) {
				callback(env);
			}
		}
	}
};

var Token = _.Token = function(type, content) {
	this.type = type;
	this.content = content;
};

Token.stringify = function(o, language, parent) {
	if (typeof o == 'string') {
		return o;
	}

	if (Object.prototype.toString.call(o) == '[object Array]') {
		return o.map(function(element) {
			return Token.stringify(element, language, o);
		}).join('');
	}

	var env = {
		type: o.type,
		content: Token.stringify(o.content, language, parent),
		tag: 'span',
		classes: ['token', o.type],
		attributes: {},
		language: language,
		parent: parent
	};

	if (env.type == 'comment') {
		env.attributes['spellcheck'] = 'true';
	}

	_.hooks.run('wrap', env);

	var attributes = '';

	for (var name in env.attributes) {
		attributes += name + '="' + (env.attributes[name] || '') + '"';
	}

	return '<' + env.tag + ' class="' + env.classes.join(' ') + '" ' + attributes + '>' + env.content + '</' + env.tag + '>';

};

// if (!self.document) {
// 	// In worker
// 	self.addEventListener('message', function(evt) {
// 		var message = JSON.parse(evt.data),
// 		    lang = message.language,
// 		    code = message.code;

// 		self.postMessage(JSON.stringify(_.tokenize(code, _.languages[lang])));
// 		self.close();
// 	}, false);

// 	return;
// }

// // Get current script and highlight
// var script = document.getElementsByTagName('script');

// script = script[script.length - 1];

// if (script) {
// 	_.filename = script.src;

// 	if (document.addEventListener && !script.hasAttribute('data-manual')) {
// 		document.addEventListener('DOMContentLoaded', _.highlightAll);
// 	}
// }

})();;
Prism.languages.markup = {
	'comment': /&lt;!--[\w\W]*?-->/g,
	'prolog': /&lt;\?.+?\?>/,
	'doctype': /&lt;!DOCTYPE.+?>/,
	'cdata': /&lt;!\[CDATA\[[\w\W]*?]]>/i,
	'tag': {
		pattern: /&lt;\/?[\w:-]+\s*(?:\s+[\w:-]+(?:=(?:("|')(\\?[\w\W])*?\1|[^\s'">=]+))?\s*)*\/?>/gi,
		inside: {
			'tag': {
				pattern: /^&lt;\/?[\w:-]+/i,
				inside: {
					'punctuation': /^&lt;\/?/,
					'namespace': /^[\w-]+?:/
				}
			},
			'attr-value': {
				pattern: /=(?:('|")[\w\W]*?(\1)|[^\s>]+)/gi,
				inside: {
					'punctuation': /=|>|"/g
				}
			},
			'punctuation': /\/?>/g,
			'attr-name': {
				pattern: /[\w:-]+/g,
				inside: {
					'namespace': /^[\w-]+?:/
				}
			}

		}
	},
	'entity': /&amp;#?[\da-z]{1,8};/gi
};

// Plugin to make entity title show the real entity, idea by Roman Komarov
Prism.hooks.add('wrap', function(env) {

	if (env.type === 'entity') {
		env.attributes['title'] = env.content.replace(/&amp;/, '&');
	}
});
;
Prism.languages.css = {
	'comment': /\/\*[\w\W]*?\*\//g,
	'atrule': {
		pattern: /@[\w-]+?.*?(;|(?=\s*{))/gi,
		inside: {
			'punctuation': /[;:]/g
		}
	},
	'url': /url\((["']?).*?\1\)/gi,
	'selector': /[^\{\}\s][^\{\};]*(?=\s*\{)/g,
	'property': /(\b|\B)[\w-]+(?=\s*:)/ig,
	'string': /("|')(\\?.)*?\1/g,
	'important': /\B!important\b/gi,
	'ignore': /&(lt|gt|amp);/gi,
	'punctuation': /[\{\};:]/g
};

if (Prism.languages.markup) {
	Prism.languages.insertBefore('markup', 'tag', {
		'style': {
			pattern: /(&lt;|<)style[\w\W]*?(>|&gt;)[\w\W]*?(&lt;|<)\/style(>|&gt;)/ig,
			inside: {
				'tag': {
					pattern: /(&lt;|<)style[\w\W]*?(>|&gt;)|(&lt;|<)\/style(>|&gt;)/ig,
					inside: Prism.languages.markup.tag.inside
				},
				rest: Prism.languages.css
			}
		}
	});
};
Prism.languages.clike = {
	'comment': {
		pattern: /(^|[^\\])(\/\*[\w\W]*?\*\/|(^|[^:])\/\/.*?(\r?\n|$))/g,
		lookbehind: true
	},
	'string': /("|')(\\?.)*?\1/g,
	'class-name': {
		pattern: /((?:(?:class|interface|extends|implements|trait|instanceof|new)\s+)|(?:catch\s+\())[a-z0-9_\.\\]+/ig,
		lookbehind: true,
		inside: {
			punctuation: /(\.|\\)/
		}
	},
	'keyword': /\b(if|else|while|do|for|return|in|instanceof|function|new|try|throw|catch|finally|null|break|continue)\b/g,
	'boolean': /\b(true|false)\b/g,
	'function': {
		pattern: /[a-z0-9_]+\(/ig,
		inside: {
			punctuation: /\(/
		}
	},
	'number': /\b-?(0x[\dA-Fa-f]+|\d*\.?\d+([Ee]-?\d+)?)\b/g,
	'operator': /[-+]{1,2}|!|&lt;=?|>=?|={1,3}|(&amp;){1,2}|\|?\||\?|\*|\/|\~|\^|\%/g,
	'ignore': /&(lt|gt|amp);/gi,
	'punctuation': /[{}[\];(),.:]/g
};
;
Prism.languages.javascript = Prism.languages.extend('clike', {
	'keyword': /\b(var|let|if|else|while|do|for|return|in|instanceof|function|get|set|new|with|typeof|try|throw|catch|finally|null|break|continue|this)\b/g,
	'number': /\b-?(0x[\dA-Fa-f]+|\d*\.?\d+([Ee]-?\d+)?|NaN|-?Infinity)\b/g
});

Prism.languages.insertBefore('javascript', 'keyword', {
	'regex': {
		pattern: /(^|[^/])\/(?!\/)(\[.+?]|\\.|[^/\r\n])+\/[gim]{0,3}(?=\s*($|[\r\n,.;})]))/g,
		lookbehind: true
	}
});

if (Prism.languages.markup) {
	Prism.languages.insertBefore('markup', 'tag', {
		'script': {
			pattern: /(&lt;|<)script[\w\W]*?(>|&gt;)[\w\W]*?(&lt;|<)\/script(>|&gt;)/ig,
			inside: {
				'tag': {
					pattern: /(&lt;|<)script[\w\W]*?(>|&gt;)|(&lt;|<)\/script(>|&gt;)/ig,
					inside: Prism.languages.markup.tag.inside
				},
				rest: Prism.languages.javascript
			}
		}
	});
}
;
Prism.languages.coffeescript = Prism.languages.extend('javascript', {
	'block-comment': /([#]{3}\s*\r?\n(.*\s*\r*\n*)\s*?\r?\n[#]{3})/g,
	'comment': /(\s|^)([#]{1}[^#^\r^\n]{2,}?(\r?\n|$))/g,
	'keyword': /\b(this|window|delete|class|extends|namespace|extend|ar|let|if|else|while|do|for|each|of|return|in|instanceof|new|with|typeof|try|catch|finally|null|undefined|break|continue)\b/g
});

Prism.languages.insertBefore('coffeescript', 'keyword', {
	'function': {
		pattern: /[a-z|A-z]+\s*[:|=]\s*(\([.|a-z\s|,|:|{|}|\"|\'|=]*\))?\s*-&gt;/gi,
		inside: {
			'function-name': /[_?a-z-|A-Z-]+(\s*[:|=])| @[_?$?a-z-|A-Z-]+(\s*)| /g,
			'operator': /[-+]{1,2}|!|=?&lt;|=?&gt;|={1,2}|(&amp;){1,2}|\|?\||\?|\*|\//g
		}
	},
	'attr-name': /[_?a-z-|A-Z-]+(\s*:)| @[_?$?a-z-|A-Z-]+(\s*)| /g
});
;
Prism.languages.c = Prism.languages.extend('clike', {
	'keyword': /\b(asm|typeof|inline|auto|break|case|char|const|continue|default|do|double|else|enum|extern|float|for|goto|if|int|long|register|return|short|signed|sizeof|static|struct|switch|typedef|union|unsigned|void|volatile|while)\b/g,
	'operator': /[-+]{1,2}|!=?|&lt;{1,2}=?|&gt;{1,2}=?|\-&gt;|={1,2}|\^|~|%|(&amp;){1,2}|\|?\||\?|\*|\//g
});

Prism.languages.insertBefore('c', 'keyword', {
    //property class reused for macro statements
    'property': {
        pattern:/#[a-zA-Z]+\ .*/g,
        inside: {
            property: /&lt;[a-zA-Z.]+>/g
        }
    }
});
;
Prism.languages.cpp = Prism.languages.extend('c', {
	'keyword': /\b(alignas|alignof|asm|auto|bool|break|case|catch|char|char16_t|char32_t|class|compl|const|constexpr|const_cast|continue|decltype|default|delete|delete\[\]|do|double|dynamic_cast|else|enum|explicit|export|extern|float|for|friend|goto|if|inline|int|long|mutable|namespace|new|new\[\]|noexcept|nullptr|operator|private|protected|public|register|reinterpret_cast|return|short|signed|sizeof|static|static_assert|static_cast|struct|switch|template|this|thread_local|throw|try|typedef|typeid|typename|union|unsigned|using|virtual|void|volatile|wchar_t|while)\b/g,
	'operator': /[-+]{1,2}|!=?|&lt;{1,2}=?|&gt;{1,2}=?|\-&gt;|:{1,2}|={1,2}|\^|~|%|(&amp;){1,2}|\|?\||\?|\*|\/|\b(and|and_eq|bitand|bitor|not|not_eq|or|or_eq|xor|xor_eq)\b/g
});
;
Prism.languages.python= {
	'comment': {
		pattern: /(^|[^\\])#.*?(\r?\n|$)/g,
		lookbehind: true
	},
	'string' : /("|')(\\?.)*?\1/g,
	'keyword' : /\b(as|assert|break|class|continue|def|del|elif|else|except|exec|finally|for|from|global|if|import|in|is|lambda|pass|print|raise|return|try|while|with|yield)\b/g,
	'boolean' : /\b(True|False)\b/g,
	'number' : /\b-?(0x)?\d*\.?[\da-f]+\b/g,
	'operator' : /[-+]{1,2}|=?&lt;|=?&gt;|!|={1,2}|(&){1,2}|(&amp;){1,2}|\|?\||\?|\*|\/|~|\^|%|\b(or|and|not)\b/g,
	'ignore' : /&(lt|gt|amp);/gi,
	'punctuation' : /[{}[\];(),.:]/g
};

;
/**
 * Original by Samuel Flores
 *
 * Adds the following new token classes:
 * 		constant, builtin, variable, symbol, regex
 */
Prism.languages.ruby = Prism.languages.extend('clike', {
	'comment': /#[^\r\n]*(\r?\n|$)/g,
	'keyword': /\b(alias|and|BEGIN|begin|break|case|class|def|define_method|defined|do|each|else|elsif|END|end|ensure|false|for|if|in|module|new|next|nil|not|or|raise|redo|require|rescue|retry|return|self|super|then|throw|true|undef|unless|until|when|while|yield)\b/g,
	'builtin': /\b(Array|Bignum|Binding|Class|Continuation|Dir|Exception|FalseClass|File|Stat|File|Fixnum|Fload|Hash|Integer|IO|MatchData|Method|Module|NilClass|Numeric|Object|Proc|Range|Regexp|String|Struct|TMS|Symbol|ThreadGroup|Thread|Time|TrueClass)\b/,
	'constant': /\b[A-Z][a-zA-Z_0-9]*[?!]?\b/g
});

Prism.languages.insertBefore('ruby', 'keyword', {
	'regex': {
		pattern: /(^|[^/])\/(?!\/)(\[.+?]|\\.|[^/\r\n])+\/[gim]{0,3}(?=\s*($|[\r\n,.;})]))/g,
		lookbehind: true
	},
	'variable': /[@$]+\b[a-zA-Z_][a-zA-Z_0-9]*[?!]?\b/g,
	'symbol': /:\b[a-zA-Z_][a-zA-Z_0-9]*[?!]?\b/g
});
;
Prism.languages.go = Prism.languages.extend('clike', {
	'keyword': /\b(break|case|chan|const|continue|default|defer|else|fallthrough|for|func|go(to)?|if|import|interface|map|package|range|return|select|struct|switch|type|var)\b/g,
	'builtin': /\b(bool|byte|complex(64|128)|error|float(32|64)|rune|string|u?int(8|16|32|64|)|uintptr|append|cap|close|complex|copy|delete|imag|len|make|new|panic|print(ln)?|real|recover)\b/g,
	'boolean': /\b(_|iota|nil|true|false)\b/g,
	'operator': /([(){}\[\]]|[*\/%^!]=?|\+[=+]?|-[>=-]?|\|[=|]?|>[=>]?|&lt;(&lt;|[=-])?|==?|&amp;(&amp;|=|^=?)?|\.(\.\.)?|[,;]|:=?)/g,
	'number': /\b(-?(0x[a-f\d]+|(\d+\.?\d*|\.\d+)(e[-+]?\d+)?)i?)\b/ig,
	'string': /("|'|`)(\\?.|\r|\n)*?\1/g
});
delete Prism.languages.go['class-name'];
;