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