28 lines
730 B
JavaScript
28 lines
730 B
JavaScript
// Based on https://spec.commonmark.org/0.30/#info-string
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// Parse out info strings on fenced code blocks, example:
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// ```javascript lineNumbers:left copy:all annotate
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// becomes...
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// node.lang = javascript
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// node.meta = { lineNumbers: 'left', copy: 'all', annotate: true }
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import { visit } from 'unist-util-visit'
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const matcher = (node) => node.type === 'code' && node.lang && node.meta
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export default function parseInfoString() {
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return (tree) => {
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visit(tree, matcher, (node) => {
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node.meta = strToObj(node.meta)
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})
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}
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}
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function strToObj(str) {
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return Object.fromEntries(
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str
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.split(/\s+/g)
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.map((k) => k.split(':'))
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.map(([k, ...v]) => [k, v.length ? v.join(':') : true])
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)
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}
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