9de68bd4a7
The linter now checks that fences have languages and that those languages are supported by PrismJS. The linter has been extended over the guide with its own set of rules that only validate code fences.
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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