146 lines
4.1 KiB
JavaScript
146 lines
4.1 KiB
JavaScript
(function () {
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if (typeof Prism === 'undefined' || typeof document === 'undefined') {
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return;
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}
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// https://developer.mozilla.org/en-US/docs/Web/API/Element/matches#Polyfill
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if (!Element.prototype.matches) {
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Element.prototype.matches = Element.prototype.msMatchesSelector || Element.prototype.webkitMatchesSelector;
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}
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var LOADING_MESSAGE = 'Loading…';
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var FAILURE_MESSAGE = function (status, message) {
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return '✖ Error ' + status + ' while fetching file: ' + message;
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};
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var FAILURE_EMPTY_MESSAGE = '✖ Error: File does not exist or is empty';
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var EXTENSIONS = {
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'js': 'javascript',
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'py': 'python',
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'rb': 'ruby',
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'ps1': 'powershell',
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'psm1': 'powershell',
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'sh': 'bash',
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'bat': 'batch',
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'h': 'c',
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'tex': 'latex'
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};
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var STATUS_ATTR = 'data-src-status';
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var STATUS_LOADING = 'loading';
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var STATUS_LOADED = 'loaded';
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var STATUS_FAILED = 'failed';
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var SELECTOR = 'pre[data-src]:not([' + STATUS_ATTR + '="' + STATUS_LOADED + '"])'
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+ ':not([' + STATUS_ATTR + '="' + STATUS_LOADING + '"])';
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var lang = /\blang(?:uage)?-([\w-]+)\b/i;
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/**
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* Sets the Prism `language-xxxx` or `lang-xxxx` class to the given language.
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*
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* @param {HTMLElement} element
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* @param {string} language
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* @returns {void}
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*/
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function setLanguageClass(element, language) {
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var className = element.className;
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className = className.replace(lang, ' ') + ' language-' + language;
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element.className = className.replace(/\s+/g, ' ').trim();
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}
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Prism.hooks.add('before-highlightall', function (env) {
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env.selector += ', ' + SELECTOR;
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});
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Prism.hooks.add('before-sanity-check', function (env) {
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var pre = /** @type {HTMLPreElement} */ (env.element);
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if (pre.matches(SELECTOR)) {
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env.code = ''; // fast-path the whole thing and go to complete
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pre.setAttribute(STATUS_ATTR, STATUS_LOADING); // mark as loading
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// add code element with loading message
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var code = pre.appendChild(document.createElement('CODE'));
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code.textContent = LOADING_MESSAGE;
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var src = pre.getAttribute('data-src');
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var language = env.language;
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if (language === 'none') {
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// the language might be 'none' because there is no language set;
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// in this case, we want to use the extension as the language
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var extension = (/\.(\w+)$/.exec(src) || [, 'none'])[1];
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language = EXTENSIONS[extension] || extension;
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}
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// set language classes
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setLanguageClass(code, language);
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setLanguageClass(pre, language);
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// preload the language
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var autoloader = Prism.plugins.autoloader;
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if (autoloader) {
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autoloader.loadLanguages(language);
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}
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// load file
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var xhr = new XMLHttpRequest();
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xhr.open('GET', src, true);
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xhr.onreadystatechange = function () {
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if (xhr.readyState == 4) {
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if (xhr.status < 400 && xhr.responseText) {
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// mark as loaded
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pre.setAttribute(STATUS_ATTR, STATUS_LOADED);
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// highlight code
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code.textContent = xhr.responseText;
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Prism.highlightElement(code);
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} else {
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// mark as failed
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pre.setAttribute(STATUS_ATTR, STATUS_FAILED);
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if (xhr.status >= 400) {
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code.textContent = FAILURE_MESSAGE(xhr.status, xhr.statusText);
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} else {
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code.textContent = FAILURE_EMPTY_MESSAGE;
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}
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}
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}
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};
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xhr.send(null);
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}
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});
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Prism.plugins.fileHighlight = {
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/**
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* Executes the File Highlight plugin for all matching `pre` elements under the given container.
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*
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* Note: Elements which are already loaded or currently loading will not be touched by this method.
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*
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* @param {ParentNode} [container=document]
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*/
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highlight: function highlight(container) {
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var elements = (container || document).querySelectorAll(SELECTOR);
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for (var i = 0, element; element = elements[i++];) {
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Prism.highlightElement(element);
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}
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}
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};
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var logged = false;
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/** @deprecated Use `Prism.plugins.fileHighlight.highlight` instead. */
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Prism.fileHighlight = function () {
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if (!logged) {
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console.warn('Prism.fileHighlight is deprecated. Use `Prism.plugins.fileHighlight.highlight` instead.');
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logged = true;
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}
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Prism.plugins.fileHighlight.highlight.apply(this, arguments);
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};
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})();
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