54 lines
2.0 KiB
JavaScript
54 lines
2.0 KiB
JavaScript
// The document's own markers, so blocks write back unchanged.
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import { unified } from 'unified'
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import remarkParse from 'remark-parse'
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import remarkGfm from 'remark-gfm'
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import { visit } from 'unist-util-visit'
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/** Writing options most of `text` already uses; tables' for remark-gfm. */
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export function style(text) {
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const votes = {}
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const vote = (key, value) => {
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votes[key] ??= new Map()
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votes[key].set(value, (votes[key].get(value) ?? 0) + 1)
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}
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visit(unified().use(remarkParse).use(remarkGfm).parse(text), (node) => {
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const at = node.position?.start.offset
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if (at === undefined) return
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const head = text.slice(at, at + 12)
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switch (node.type) {
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case 'listItem': {
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const ordered = /^\d+([.)])/.exec(head)
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if (ordered) vote('bulletOrdered', ordered[1])
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else if (/^[*+-]/.test(head)) vote('bullet', head[0])
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break
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}
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case 'emphasis':
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case 'strong':
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vote(node.type, head[0])
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break
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case 'code':
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if (/^[`~]/.test(head)) vote('fence', head[0])
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break
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case 'thematicBreak':
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vote('rule', head[0])
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break
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case 'heading':
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if (node.depth <= 2) vote('setext', head[0] !== '#')
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break
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case 'table': {
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// Row nodes leave out quote and list prefixes.
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const rows = node.children.map((row) => text.slice(row.position.start.offset, row.position.end.offset).trim())
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const padded = /\| /.test(rows[0])
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const cells = rows.flatMap((row) => row.replace(/^\||\|$/g, '').split('|'))
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const inner = (cell) => (padded ? cell.replace(/^ | $/g, '') : cell)
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vote('tableCellPadding', padded)
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// Aligned cells carry spaces beyond the padding.
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vote('tablePipeAlign', cells.some((cell) => /^\s|\s$/.test(inner(cell))))
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break
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}
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}
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})
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const most = (key) => [...votes[key].entries()].sort((a, b) => b[1] - a[1])[0][0]
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return Object.fromEntries(Object.keys(votes).map((key) => [key, most(key)]))
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}
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