71 lines
1.7 KiB
Plaintext
71 lines
1.7 KiB
Plaintext
/**
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* @typedef {import('hast').Element} Element
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* @typedef {import('mdast').FootnoteReference} FootnoteReference
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* @typedef {import('../state.js').State} State
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*/
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import {normalizeUri} from 'micromark-util-sanitize-uri'
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/**
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* Turn an mdast `footnoteReference` node into hast.
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*
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* @param {State} state
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* Info passed around.
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* @param {FootnoteReference} node
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* mdast node.
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* @returns {Element}
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* hast node.
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*/
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export function footnoteReference(state, node) {
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const clobberPrefix =
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typeof state.options.clobberPrefix === 'string'
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? state.options.clobberPrefix
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: 'user-content-'
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const id = String(node.identifier).toUpperCase()
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const safeId = normalizeUri(id.toLowerCase())
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const index = state.footnoteOrder.indexOf(id)
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/** @type {number} */
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let counter
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let reuseCounter = state.footnoteCounts.get(id)
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if (reuseCounter === undefined) {
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reuseCounter = 0
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state.footnoteOrder.push(id)
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counter = state.footnoteOrder.length
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} else {
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counter = index + 1
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}
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reuseCounter += 1
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state.footnoteCounts.set(id, reuseCounter)
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/** @type {Element} */
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const link = {
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type: 'element',
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tagName: 'a',
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properties: {
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href: '#' + clobberPrefix + 'fn-' + safeId,
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id:
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clobberPrefix +
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'fnref-' +
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safeId +
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(reuseCounter > 1 ? '-' + reuseCounter : ''),
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dataFootnoteRef: true,
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ariaDescribedBy: ['footnote-label']
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},
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children: [{type: 'text', value: String(counter)}]
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}
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state.patch(node, link)
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/** @type {Element} */
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const sup = {
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type: 'element',
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tagName: 'sup',
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properties: {},
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children: [link]
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}
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state.patch(node, sup)
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return state.applyData(node, sup)
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}
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