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 = /*dependencies_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-templating",
		"ejs": [
			"javascript",
			"markup-templating"
		],
		"erb": [
			"ruby",
			"markup-templating"
		],
		"fsharp": "clike",
		"flow": "javascript",
		"glsl": "clike",
		"gml": "clike",
		"go": "clike",
		"groovy": "clike",
		"haml": "ruby",
		"handlebars": "markup-templating",
		"haxe": "clike",
		"java": "clike",
		"javadoc": [
			"markup",
			"java",
			"javadoclike"
		],
		"jolie": "clike",
		"jsdoc": [
			"javascript",
			"javadoclike"
		],
		"js-extras": "javascript",
		"jsonp": "json",
		"json5": "json",
		"kotlin": "clike",
		"less": "css",
		"markdown": "markup",
		"markup-templating": "markup",
		"n4js": "javascript",
		"nginx": "clike",
		"objectivec": "c",
		"opencl": "cpp",
		"parser": "markup",
		"php": [
			"clike",
			"markup-templating"
		],
		"phpdoc": [
			"php",
			"javadoclike"
		],
		"php-extras": "php",
		"plsql": "sql",
		"processing": "clike",
		"protobuf": "clike",
		"pug": [
			"markup",
			"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",
		"tap": "yaml",
		"textile": "markup",
		"tt2": [
			"clike",
			"markup-templating"
		],
		"twig": "markup",
		"typescript": "javascript",
		"t4-cs": [
			"t4-templating",
			"csharp"
		],
		"t4-vb": [
			"t4-templating",
			"visual-basic"
		],
		"vala": "clike",
		"vbnet": "basic",
		"velocity": "markup",
		"wiki": "markup",
		"xeora": "markup",
		"xquery": "markup"
	}/*]*/;

	var lang_aliases = /*aliases_placeholder[*/{
		"html": "markup",
		"xml": "markup",
		"svg": "markup",
		"mathml": "markup",
		"js": "javascript",
		"adoc": "asciidoc",
		"shell": "bash",
		"rbnf": "bnf",
		"cs": "csharp",
		"dotnet": "csharp",
		"coffee": "coffeescript",
		"jinja2": "django",
		"dockerfile": "docker",
		"gamemakerlanguage": "gml",
		"hs": "haskell",
		"tex": "latex",
		"context": "latex",
		"emacs": "lisp",
		"elisp": "lisp",
		"emacs-lisp": "lisp",
		"md": "markdown",
		"n4jsd": "n4js",
		"objectpascal": "pascal",
		"py": "python",
		"rb": "ruby",
		"ts": "typescript",
		"t4": "t4-cs",
		"vb": "visual-basic",
		"xeoracube": "xeora",
		"yml": "yaml"
	}/*]*/;

	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 addScript = 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) {
		if (lang in lang_aliases) {
			lang = lang_aliases[lang];
		}

		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 force = lang.indexOf('!') >= 0;

		lang = lang.replace('!', '');
		lang = lang_aliases[lang] || lang;

		var load = function () {
			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);
				addScript(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);
			}
		}
	});

}());