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Standardized dependency logic implementation (#1998)
This adds a standard logic for handling dependencies between Prism components. Right now, the download page, the `loadLanguages` function, and the test suite use the new dependency system.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,82 +1,49 @@ | ||
| var components = require('../components.js'); | ||
| var peerDependentsMap = null; | ||
|
|
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| function getPeerDependentsMap() { | ||
| var peerDependentsMap = {}; | ||
| Object.keys(components.languages).forEach(function (language) { | ||
| if (language === 'meta') { | ||
| return false; | ||
| } | ||
| if (components.languages[language].peerDependencies) { | ||
| var peerDependencies = components.languages[language].peerDependencies; | ||
| if (!Array.isArray(peerDependencies)) { | ||
| peerDependencies = [peerDependencies]; | ||
| } | ||
| peerDependencies.forEach(function (peerDependency) { | ||
| if (!peerDependentsMap[peerDependency]) { | ||
| peerDependentsMap[peerDependency] = []; | ||
| } | ||
| peerDependentsMap[peerDependency].push(language); | ||
| }); | ||
| } | ||
| }); | ||
| return peerDependentsMap; | ||
| } | ||
|
|
||
| function getPeerDependents(mainLanguage) { | ||
| if (!peerDependentsMap) { | ||
| peerDependentsMap = getPeerDependentsMap(); | ||
| const components = require('../components.js'); | ||
| 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. | ||
| * | ||
| * @type {Set<string>} | ||
| */ | ||
| const loadedLanguages = new Set(); | ||
|
|
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| /** | ||
| * Loads the given languages and adds them to the current Prism instance. | ||
| * | ||
| * If no languages are provided, __all__ Prism languages will be loaded. | ||
| * | ||
| * @param {string|string[]} [languages] | ||
| * @returns {void} | ||
| */ | ||
| function loadLanguages(languages) { | ||
| if (languages === undefined) { | ||
| languages = Object.keys(components.languages).filter(l => l != 'meta'); | ||
| } else if (!Array.isArray(languages)) { | ||
| languages = [languages]; | ||
| } | ||
| return peerDependentsMap[mainLanguage] || []; | ||
| } | ||
|
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| function loadLanguages(arr, withoutDependencies) { | ||
| // If no argument is passed, load all components | ||
| if (!arr) { | ||
| arr = Object.keys(components.languages).filter(function (language) { | ||
| return language !== 'meta'; | ||
| }); | ||
| } | ||
| if (arr && !arr.length) { | ||
| return; | ||
| } | ||
|
|
||
| if (!Array.isArray(arr)) { | ||
| arr = [arr]; | ||
| } | ||
| // the user might have loaded languages via some other way or used `prism.js` which already includes some | ||
| // we don't need to validate the ids because `getLoader` will ignore invalid ones | ||
| const loaded = [...loadedLanguages, ...Object.keys(Prism.languages)]; | ||
|
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||
| arr.forEach(function (language) { | ||
| if (!components.languages[language]) { | ||
| console.warn('Language does not exist ' + language); | ||
| getLoader(components, languages, loaded).load(lang => { | ||
| if (!(lang in components.languages)) { | ||
| console.warn('Language does not exist: ' + lang); | ||
| return; | ||
| } | ||
| // Load dependencies first | ||
| if (!withoutDependencies && components.languages[language].require) { | ||
| loadLanguages(components.languages[language].require); | ||
| } | ||
|
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| var pathToLanguage = './prism-' + language; | ||
| const pathToLanguage = './prism-' + lang; | ||
|
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| // remove from require cache and from Prism | ||
| delete require.cache[require.resolve(pathToLanguage)]; | ||
| delete Prism.languages[language]; | ||
| delete Prism.languages[lang]; | ||
|
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| require(pathToLanguage); | ||
|
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| // Reload dependents | ||
| var dependents = getPeerDependents(language).filter(function (dependent) { | ||
| // If dependent language was already loaded, | ||
| // we want to reload it. | ||
| if (Prism.languages[dependent]) { | ||
| delete Prism.languages[dependent]; | ||
| return true; | ||
| } | ||
| return false; | ||
| }); | ||
| if (dependents.length) { | ||
| loadLanguages(dependents, true); | ||
| } | ||
| loadedLanguages.add(lang); | ||
| }); | ||
| } | ||
|
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| module.exports = function (arr) { | ||
| // Don't expose withoutDependencies | ||
| loadLanguages(arr); | ||
| }; | ||
| module.exports = loadLanguages; |
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