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64 lines
2.1 KiB
JavaScript
64 lines
2.1 KiB
JavaScript
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const Prism = require('prismjs');
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const PrismLoader = require('prismjs/components/index.js');
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PrismLoader('diff');
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PrismLoader.silent = true;
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/** Highlights a code string. */
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function highlight(code, language) {
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const alias = language.replace(/^diff-/, '');
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const isDiff = /^diff-/i.test(language);
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// Auto-load the target language
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if (!Prism.languages[alias]) {
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PrismLoader(alias);
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if (!Prism.languages[alias]) {
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throw new Error(`Unsupported language for code highlighting: "${language}"`);
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}
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}
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// Register diff-* languages to use the diff grammar
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if (isDiff) {
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Prism.languages[language] = Prism.languages.diff;
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}
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return Prism.highlight(code, Prism.languages[language], language);
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}
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/**
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* Highlights all code fields that have a language parameter. If the language has a colon in its name, the first chunk
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* will be the language used and additional chunks will be applied as classes to the `<pre>`. For example, a code field
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* tagged with "html:preview" will be rendered as `<pre class="language-html preview">`.
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*
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* The provided doc should be a document object provided by JSDOM. The same document will be returned with the
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* appropriate DOM manipulations.
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*/
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module.exports = function (doc) {
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doc.querySelectorAll('pre > code[class]').forEach(code => {
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// Look for class="language-*" and split colons into separate classes
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code.classList.forEach(className => {
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if (className.startsWith('language-')) {
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//
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// We use certain suffixes to indicate code previews, expanded states, etc. The class might look something like
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// this:
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//
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// class="language-html:preview:expanded"
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//
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// The language will always come first, so we need to drop the "language-" prefix and everything after the first
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// color to get the highlighter language.
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//
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const language = className.replace(/^language-/, '').split(':')[0];
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try {
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code.innerHTML = highlight(code.textContent ?? '', language);
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} catch (err) {
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// Language not found, skip it
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}
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}
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});
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});
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return doc;
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};
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