57 lines
1.5 KiB
JavaScript
57 lines
1.5 KiB
JavaScript
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const components = require('../components.js');
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const getLoader = require('../dependencies');
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/**
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* The set of all languages which have been loaded using the below function.
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*
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* @type {Set<string>}
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*/
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const loadedLanguages = new Set();
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/**
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* Loads the given languages and adds them to the current Prism instance.
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*
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* If no languages are provided, __all__ Prism languages will be loaded.
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*
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* @param {string|string[]} [languages]
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* @returns {void}
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*/
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function loadLanguages(languages) {
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if (languages === undefined) {
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languages = Object.keys(components.languages).filter(l => l != 'meta');
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} else if (!Array.isArray(languages)) {
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languages = [languages];
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}
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// the user might have loaded languages via some other way or used `prism.js` which already includes some
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// we don't need to validate the ids because `getLoader` will ignore invalid ones
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const loaded = [...loadedLanguages, ...Object.keys(Prism.languages)];
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getLoader(components, languages, loaded).load(lang => {
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if (!(lang in components.languages)) {
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if (!loadLanguages.silent) {
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console.warn('Language does not exist: ' + lang);
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}
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return;
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}
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const pathToLanguage = './prism-' + lang;
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// remove from require cache and from Prism
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delete require.cache[require.resolve(pathToLanguage)];
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delete Prism.languages[lang];
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require(pathToLanguage);
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loadedLanguages.add(lang);
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});
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}
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/**
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* Set this to `true` to prevent all warning messages `loadLanguages` logs.
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*/
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loadLanguages.silent = false;
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module.exports = loadLanguages;
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