prism-core.js

var _self = (typeof window !== 'undefined')
	? window   // if in browser
	: (
		(typeof WorkerGlobalScope !== 'undefined' && self instanceof WorkerGlobalScope)
		? self // if in worker
		: {}   // if in node js
	);

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

var Prism = (function (_self){

// Private helper vars
var lang = /\blang(?:uage)?-([\w-]+)\b/i;
var uniqueId = 0;

/**
 * Returns the Prism language of the given element set by a `language-xxxx` or `lang-xxxx` class.
 *
 * If no language is set for the element or the element is `null` or `undefined`, `none` will be returned.
 *
 * @param {Element} element
 * @returns {string}
 */
function getLanguage(element) {
	while (element && !lang.test(element.className)) {
		element = element.parentNode;
	}
	if (element) {
		return (element.className.match(lang) || [, 'none'])[1].toLowerCase();
	}
	return 'none';
}


var _ = {
	manual: _self.Prism && _self.Prism.manual,
	disableWorkerMessageHandler: _self.Prism && _self.Prism.disableWorkerMessageHandler,
	util: {
		encode: function (tokens) {
			if (tokens instanceof Token) {
				return new Token(tokens.type, _.util.encode(tokens.content), tokens.alias);
			} else if (Array.isArray(tokens)) {
				return tokens.map(_.util.encode);
			} else {
				return tokens.replace(/&/g, '&amp;').replace(/</g, '&lt;').replace(/\u00a0/g, ' ');
			}
		},

		type: function (o) {
			return Object.prototype.toString.call(o).slice(8, -1);
		},

		objId: function (obj) {
			if (!obj['__id']) {
				Object.defineProperty(obj, '__id', { value: ++uniqueId });
			}
			return obj['__id'];
		},

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

			switch (type) {
				case 'Object':
					id = _.util.objId(o);
					if (visited[id]) {
						return visited[id];
					}
					clone = {};
					visited[id] = clone;

					for (var key in o) {
						if (o.hasOwnProperty(key)) {
							clone[key] = deepClone(o[key], visited);
						}
					}

					return clone;

				case 'Array':
					id = _.util.objId(o);
					if (visited[id]) {
						return visited[id];
					}
					clone = [];
					visited[id] = clone;

					o.forEach(function (v, i) {
						clone[i] = deepClone(v, visited);
					});

					return clone;

				default:
					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
		 * As this needs to recreate the object (we cannot actually insert before keys in object literals),
		 * we cannot just provide an object, we need an object and a key.
		 * @param inside The key (or language id) of the parent
		 * @param before The key to insert before.
		 * @param insert Object with the key/value pairs to insert
		 * @param root The object that contains `inside`. If equal to Prism.languages, it can be omitted.
		 */
		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];
							}
						}
					}

					// Do not insert token which also occur in insert. See #1525
					if (!insert.hasOwnProperty(token)) {
						ret[token] = grammar[token];
					}
				}
			}

			var old = root[inside];
			root[inside] = ret;

			// Update references in other language definitions
			_.languages.DFS(_.languages, function(key, value) {
				if (value === old && key != inside) {
					this[key] = ret;
				}
			});

			return ret;
		},

		// Traverse a language definition with Depth First Search
		DFS: function DFS(o, callback, type, visited) {
			visited = visited || {};

			var objId = _.util.objId;

			for (var i in o) {
				if (o.hasOwnProperty(i)) {
					callback.call(o, i, o[i], type || i);

					var property = o[i],
					    propertyType = _.util.type(property);

					if (propertyType === 'Object' && !visited[objId(property)]) {
						visited[objId(property)] = true;
						DFS(property, callback, null, visited);
					}
					else if (propertyType === 'Array' && !visited[objId(property)]) {
						visited[objId(property)] = true;
						DFS(property, callback, i, visited);
					}
				}
			}
		}
	},
	plugins: {},

	highlightAll: function(async, callback) {
		_.highlightAllUnder(document, async, callback);
	},

	highlightAllUnder: function(container, async, callback) {
		var env = {
			callback: callback,
			selector: 'code[class*="language-"], [class*="language-"] code, code[class*="lang-"], [class*="lang-"] code'
		};

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

		var elements = container.querySelectorAll(env.selector);

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

	highlightElement: function(element, async, callback) {
		// Find language
		var language = getLanguage(element);
		var grammar = _.languages[language];

		// 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
		var parent = element.parentNode;
		if (parent && parent.nodeName.toLowerCase() === 'pre') {
			parent.className = parent.className.replace(lang, '').replace(/\s+/g, ' ') + ' language-' + language;
		}

		var code = element.textContent;

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

		function insertHighlightedCode(highlightedCode) {
			env.highlightedCode = highlightedCode;

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

			env.element.innerHTML = env.highlightedCode;

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

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

		if (!env.code) {
			_.hooks.run('complete', env);
			callback && callback.call(env.element);
			return;
		}

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

		if (!env.grammar) {
			insertHighlightedCode(_.util.encode(env.code));
			return;
		}

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

			worker.onmessage = function(evt) {
				insertHighlightedCode(evt.data);
			};

			worker.postMessage(JSON.stringify({
				language: env.language,
				code: env.code,
				immediateClose: true
			}));
		}
		else {
			insertHighlightedCode(_.highlight(env.code, env.grammar, env.language));
		}
	},

	highlight: function (text, grammar, language) {
		var env = {
			code: text,
			grammar: grammar,
			language: language
		};
		_.hooks.run('before-tokenize', env);
		env.tokens = _.tokenize(env.code, env.grammar);
		_.hooks.run('after-tokenize', env);
		return Token.stringify(_.util.encode(env.tokens), env.language);
	},

	matchGrammar: function (text, strarr, grammar, index, startPos, oneshot, target) {
		for (var token in grammar) {
			if (!grammar.hasOwnProperty(token) || !grammar[token]) {
				continue;
			}

			var patterns = grammar[token];
			patterns = Array.isArray(patterns) ? patterns : [patterns];

			for (var j = 0; j < patterns.length; ++j) {
				if (target && target == token + ',' + j) {
					return;
				}

				var pattern = patterns[j],
					inside = pattern.inside,
					lookbehind = !!pattern.lookbehind,
					greedy = !!pattern.greedy,
					lookbehindLength = 0,
					alias = pattern.alias;

				if (greedy && !pattern.pattern.global) {
					// Without the global flag, lastIndex won't work
					var flags = pattern.pattern.toString().match(/[imsuy]*$/)[0];
					pattern.pattern = RegExp(pattern.pattern.source, flags + 'g');
				}

				pattern = pattern.pattern || pattern;

				// Don’t cache length as it changes during the loop
				for (var i = index, pos = startPos; i < strarr.length; pos += strarr[i].length, ++i) {

					var str = strarr[i];

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

					if (str instanceof Token) {
						continue;
					}

					if (greedy && i != strarr.length - 1) {
						pattern.lastIndex = pos;
						var match = pattern.exec(text);
						if (!match) {
							break;
						}

						var from = match.index + (lookbehind && match[1] ? match[1].length : 0),
						    to = match.index + match[0].length,
						    k = i,
						    p = pos;

						for (var len = strarr.length; k < len && (p < to || (!strarr[k].type && !strarr[k - 1].greedy)); ++k) {
							p += strarr[k].length;
							// Move the index i to the element in strarr that is closest to from
							if (from >= p) {
								++i;
								pos = p;
							}
						}

						// If strarr[i] is a Token, then the match starts inside another Token, which is invalid
						if (strarr[i] instanceof Token) {
							continue;
						}

						// Number of tokens to delete and replace with the new match
						delNum = k - i;
						str = text.slice(pos, p);
						match.index -= pos;
					} else {
						pattern.lastIndex = 0;

						var match = pattern.exec(str),
							delNum = 1;
					}

					if (!match) {
						if (oneshot) {
							break;
						}

						continue;
					}

					if(lookbehind) {
						lookbehindLength = match[1] ? match[1].length : 0;
					}

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

					var args = [i, delNum];

					if (before) {
						++i;
						pos += before.length;
						args.push(before);
					}

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

					args.push(wrapped);

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

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

					if (delNum != 1)
						_.matchGrammar(text, strarr, grammar, i, pos, true, token + ',' + j);

					if (oneshot)
						break;
				}
			}
		}
	},

	tokenize: function(text, grammar) {
		var strarr = [text];

		var rest = grammar.rest;

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

			delete grammar.rest;
		}

		_.matchGrammar(text, strarr, grammar, 0, 0, false);

		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);
			}
		}
	},

	Token: Token
};

_self.Prism = _;

function Token(type, content, alias, matchedStr, greedy) {
	this.type = type;
	this.content = content;
	this.alias = alias;
	// Copy of the full string this token was created from
	this.length = (matchedStr || '').length|0;
	this.greedy = !!greedy;
}

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

	if (Array.isArray(o)) {
		return o.map(function(element) {
			return Token.stringify(element, language);
		}).join('');
	}

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

	if (o.alias) {
		var aliases = Array.isArray(o.alias) ? o.alias : [o.alias];
		Array.prototype.push.apply(env.classes, aliases);
	}

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

	var attributes = Object.keys(env.attributes).map(function(name) {
		return name + '="' + (env.attributes[name] || '').replace(/"/g, '&quot;') + '"';
	}).join(' ');

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

if (!_self.document) {
	if (!_self.addEventListener) {
		// in Node.js
		return _;
	}

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

			_self.postMessage(_.highlight(code, _.languages[lang], lang));
			if (immediateClose) {
				_self.close();
			}
		}, false);
	}

	return _;
}

//Get current script and highlight
var script = document.currentScript || [].slice.call(document.getElementsByTagName('script')).pop();

if (script) {
	_.filename = script.src;
	
	if (script.hasAttribute('data-manual')) {
		_.manual = true;
	}
}

if (!_.manual) {
	function highlightAutomaticallyCallback() {
		if (!_.manual) {
			_.highlightAll();
		}
	}

	if(document.readyState !== 'loading') {
		if (window.requestAnimationFrame) {
			window.requestAnimationFrame(highlightAutomaticallyCallback);
		} else {
			window.setTimeout(highlightAutomaticallyCallback, 16);
		}
	}
	else {
		document.addEventListener('DOMContentLoaded', highlightAutomaticallyCallback);
	}
}

return _;

})(_self);

if (typeof module !== 'undefined' && module.exports) {
	module.exports = Prism;
}

// hack for components to work correctly in node.js
if (typeof global !== 'undefined') {
	global.Prism = Prism;
}