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