prism/plugins/autoloader/prism-autoloader.js

(function () {
	if (typeof self === 'undefined' || !self.Prism || !self.document || !document.createElement) {
		return;
	}

	// The dependencies map is built automatically with gulp
	var lang_dependencies = /*languages_placeholder[*/{"javascript":"clike","actionscript":"javascript","arduino":"cpp","aspnet":["markup","csharp"],"bison":"c","c":"clike","csharp":"clike","cpp":"c","coffeescript":"javascript","crystal":"ruby","css-extras":"css","d":"clike","dart":"clike","django":"markup","erb":["ruby","markup-templating"],"fsharp":"clike","flow":"javascript","glsl":"clike","go":"clike","groovy":"clike","haml":"ruby","handlebars":"markup-templating","haxe":"clike","java":"clike","jolie":"clike","kotlin":"clike","less":"css","markdown":"markup","markup-templating":"markup","n4js":"javascript","nginx":"clike","objectivec":"c","opencl":"cpp","parser":"markup","php":["clike","markup-templating"],"php-extras":"php","plsql":"sql","processing":"clike","protobuf":"clike","pug":"javascript","qore":"clike","jsx":["markup","javascript"],"tsx":["jsx","typescript"],"reason":"clike","ruby":"clike","sass":"css","scss":"css","scala":"java","smarty":"markup-templating","soy":"markup-templating","swift":"clike","textile":"markup","tt2":["clike","markup-templating"],"twig":"markup","typescript":"javascript","vbnet":"basic","velocity":"markup","wiki":"markup","xeora":"markup"}/*]*/;

	var lang_data = {};

	var ignored_language = 'none';

	var script = document.getElementsByTagName('script');
	script = script[script.length - 1];
	var languages_path = 'components/';
	if(script.hasAttribute('data-autoloader-path')) {
		var path = script.getAttribute('data-autoloader-path').trim();
		if(path.length > 0 && !/^[a-z]+:\/\//i.test(script.src)) {
			languages_path = path.replace(/\/?$/, '/');
		}
	} else if (/[\w-]+\.js$/.test(script.src)) {
		languages_path = script.src.replace(/[\w-]+\.js$/, 'components/');
	}
	var config = Prism.plugins.autoloader = {
		languages_path: languages_path,
		use_minified: true
	};

	/**
	 * Lazy loads an external script
	 * @param {string} src
	 * @param {function=} success
	 * @param {function=} error
	 */
	var script = function (src, success, error) {
		var s = document.createElement('script');
		s.src = src;
		s.async = true;
		s.onload = function() {
			document.body.removeChild(s);
			success && success();
		};
		s.onerror = function() {
			document.body.removeChild(s);
			error && error();
		};
		document.body.appendChild(s);
	};

	/**
	 * Returns the path to a grammar, using the language_path and use_minified config keys.
	 * @param {string} lang
	 * @returns {string}
	 */
	var getLanguagePath = function (lang) {
		return config.languages_path +
			'prism-' + lang
			+ (config.use_minified ? '.min' : '') + '.js'
	};

	/**
	 * Tries to load a grammar and
	 * highlight again the given element once loaded.
	 * @param {string} lang
	 * @param {HTMLElement} elt
	 */
	var registerElement = function (lang, elt) {
		var data = lang_data[lang];
		if (!data) {
			data = lang_data[lang] = {};
		}

		// Look for additional dependencies defined on the <code> or <pre> tags
		var deps = elt.getAttribute('data-dependencies');
		if (!deps && elt.parentNode && elt.parentNode.tagName.toLowerCase() === 'pre') {
			deps = elt.parentNode.getAttribute('data-dependencies');
		}

		if (deps) {
			deps = deps.split(/\s*,\s*/g);
		} else {
			deps = [];
		}

		loadLanguages(deps, function () {
			loadLanguage(lang, function () {
				Prism.highlightElement(elt);
			});
		});
	};

	/**
	 * Sequentially loads an array of grammars.
	 * @param {string[]|string} langs
	 * @param {function=} success
	 * @param {function=} error
	 */
	var loadLanguages = function (langs, success, error) {
		if (typeof langs === 'string') {
			langs = [langs];
		}
		var i = 0;
		var l = langs.length;
		var f = function () {
			if (i < l) {
				loadLanguage(langs[i], function () {
					i++;
					f();
				}, function () {
					error && error(langs[i]);
				});
			} else if (i === l) {
				success && success(langs);
			}
		};
		f();
	};

	/**
	 * Load a grammar with its dependencies
	 * @param {string} lang
	 * @param {function=} success
	 * @param {function=} error
	 */
	var loadLanguage = function (lang, success, error) {
		var load = function () {
			var force = false;
			// Do we want to force reload the grammar?
			if (lang.indexOf('!') >= 0) {
				force = true;
				lang = lang.replace('!', '');
			}

			var data = lang_data[lang];
			if (!data) {
				data = lang_data[lang] = {};
			}
			if (success) {
				if (!data.success_callbacks) {
					data.success_callbacks = [];
				}
				data.success_callbacks.push(success);
			}
			if (error) {
				if (!data.error_callbacks) {
					data.error_callbacks = [];
				}
				data.error_callbacks.push(error);
			}

			if (!force && Prism.languages[lang]) {
				languageSuccess(lang);
			} else if (!force && data.error) {
				languageError(lang);
			} else if (force || !data.loading) {
				data.loading = true;
				var src = getLanguagePath(lang);
				script(src, function () {
					data.loading = false;
					languageSuccess(lang);

				}, function () {
					data.loading = false;
					data.error = true;
					languageError(lang);
				});
			}
		};
		var dependencies = lang_dependencies[lang];
		if(dependencies && dependencies.length) {
			loadLanguages(dependencies, load);
		} else {
			load();
		}
	};

	/**
	 * Runs all success callbacks for this language.
	 * @param {string} lang
	 */
	var languageSuccess = function (lang) {
		if (lang_data[lang] && lang_data[lang].success_callbacks && lang_data[lang].success_callbacks.length) {
			lang_data[lang].success_callbacks.forEach(function (f) {
				f(lang);
			});
		}
	};

	/**
	 * Runs all error callbacks for this language.
	 * @param {string} lang
	 */
	var languageError = function (lang) {
		if (lang_data[lang] && lang_data[lang].error_callbacks && lang_data[lang].error_callbacks.length) {
			lang_data[lang].error_callbacks.forEach(function (f) {
				f(lang);
			});
		}
	};

	Prism.hooks.add('complete', function (env) {
		if (env.element && env.language && !env.grammar) {
			if (env.language !== ignored_language) {
				registerElement(env.language, env.element);
			}
		}
	});

}());