132 lines
3.0 KiB
JavaScript
132 lines
3.0 KiB
JavaScript
"use strict";
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var fs = require("fs");
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var vm = require("vm");
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var components = require("./components");
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var languagesCatalog = components.languages;
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module.exports = {
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/**
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* Creates a new Prism instance with the given language loaded
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*
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* @param {string|string[]} languages
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* @returns {Prism}
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*/
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createInstance: function (languages) {
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var context = {
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loadedLanguages: [],
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Prism: this.createEmptyPrism()
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};
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context = this.loadLanguages(languages, context);
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return context.Prism;
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},
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/**
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* Loads the given languages and appends the config to the given Prism object
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*
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* @private
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* @param {string|string[]} languages
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* @param {{loadedLanguages: string[], Prism: Prism}} context
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* @returns {{loadedLanguages: string[], Prism: Prism}}
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*/
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loadLanguages: function (languages, context) {
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if (typeof languages === 'string') {
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languages = [languages];
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}
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var self = this;
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languages.forEach(function (language) {
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context = self.loadLanguage(language, context);
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});
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return context;
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},
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/**
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* Loads the given language (including recursively loading the dependencies) and
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* appends the config to the given Prism object
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*
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* @private
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* @param {string} language
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* @param {{loadedLanguages: string[], Prism: Prism}} context
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* @returns {{loadedLanguages: string[], Prism: Prism}}
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*/
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loadLanguage: function (language, context) {
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if (!languagesCatalog[language]) {
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throw new Error("Language '" + language + "' not found.");
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}
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// the given language was already loaded
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if (-1 < context.loadedLanguages.indexOf(language)) {
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return context;
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}
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// if the language has a dependency -> load it first
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if (languagesCatalog[language].require) {
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context = this.loadLanguages(languagesCatalog[language].require, context);
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}
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// load the language itself
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var languageSource = this.loadFileSource(language);
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context.Prism = this.runFileWithContext(languageSource, {Prism: context.Prism}).Prism;
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context.loadedLanguages.push(language);
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return context;
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},
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/**
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* Creates a new empty prism instance
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*
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* @private
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* @returns {Prism}
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*/
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createEmptyPrism: function () {
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var coreSource = this.loadFileSource("core");
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var context = this.runFileWithContext(coreSource);
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return context.Prism;
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},
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/**
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* Cached file sources, to prevent massive HDD work
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*
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* @private
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* @type {Object.<string, string>}
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*/
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fileSourceCache: {},
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/**
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* Loads the given file source as string
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*
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* @private
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* @param {string} name
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* @returns {string}
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*/
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loadFileSource: function (name) {
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return this.fileSourceCache[name] = this.fileSourceCache[name] || fs.readFileSync(__dirname + "/../../components/prism-" + name + ".js", "utf8");
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},
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/**
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* Runs a VM for a given file source with the given context
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*
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* @private
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* @param {string} fileSource
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* @param {*} [context]
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*
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* @returns {*}
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*/
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runFileWithContext: function (fileSource, context) {
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context = context || {};
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vm.runInNewContext(fileSource, context);
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return context;
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}
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};
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