36 lines
939 B
JavaScript
36 lines
939 B
JavaScript
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export default class CodeBlockLanguageLoader {
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constructor(lowlight) {
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this.lowlight = lowlight;
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}
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isLanguageLoaded(language) {
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return this.lowlight.registered(language);
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}
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loadLanguagesFromDOM(domTree) {
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const languages = [];
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domTree.querySelectorAll('pre').forEach((preElement) => {
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languages.push(preElement.getAttribute('lang'));
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});
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return this.loadLanguages(languages);
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}
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loadLanguages(languageList = []) {
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const loaders = languageList
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.filter((languageName) => !this.isLanguageLoaded(languageName))
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.map((languageName) => {
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return import(
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/* webpackChunkName: 'highlight.language.js' */ `highlight.js/lib/languages/${languageName}`
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)
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.then(({ default: language }) => {
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this.lowlight.registerLanguage(languageName, language);
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})
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.catch(() => false);
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});
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return Promise.all(loaders);
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}
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}
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