45 lines
1.4 KiB
JavaScript
45 lines
1.4 KiB
JavaScript
const components = require(`prismjs/components`);
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module.exports = {
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names: ['prism-langs'],
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description: 'Code block languages should be supported by PrismJS',
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tags: ['prism'],
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function: function rule(params, onError) {
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params.tokens
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.filter(param => param.type === 'fence')
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.forEach(codeBlock => {
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// whitespace around the language is ignored by the parser, as is case:
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const baseLang = codeBlock.info.trim().toLowerCase();
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const lang = getBaseLanguageName(baseLang);
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// Rule MD040 checks if the block has a language, so this rule only
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// comes into play if a language has been specified.
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if (baseLang && !lang) {
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onError({
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lineNumber: codeBlock.lineNumber,
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detail: `'${baseLang}' is not recognised.`
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});
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}
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});
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}
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};
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/*
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* This is the method used by https://github.com/gatsbyjs/gatsby/blob/master/packages/gatsby-remark-prismjs/src/load-prism-language.js
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*/
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// Get the real name of a language given it or an alias
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const getBaseLanguageName = nameOrAlias => {
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if (components.languages[nameOrAlias]) {
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return nameOrAlias;
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}
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return Object.keys(components.languages).find(language => {
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const { alias } = components.languages[language];
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if (!alias) return false;
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if (Array.isArray(alias)) {
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return alias.includes(nameOrAlias);
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} else {
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return alias === nameOrAlias;
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}
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});
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};
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