107 lines
2.6 KiB
Plaintext
107 lines
2.6 KiB
Plaintext
/**
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* @typedef {import('mdast').Delete} Delete
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*
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* @typedef {import('mdast-util-from-markdown').CompileContext} CompileContext
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* @typedef {import('mdast-util-from-markdown').Extension} FromMarkdownExtension
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* @typedef {import('mdast-util-from-markdown').Handle} FromMarkdownHandle
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*
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* @typedef {import('mdast-util-to-markdown').ConstructName} ConstructName
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* @typedef {import('mdast-util-to-markdown').Handle} ToMarkdownHandle
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* @typedef {import('mdast-util-to-markdown').Options} ToMarkdownExtension
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*/
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/**
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* List of constructs that occur in phrasing (paragraphs, headings), but cannot
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* contain strikethrough.
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* So they sort of cancel each other out.
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* Note: could use a better name.
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*
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* Note: keep in sync with: <https://github.com/syntax-tree/mdast-util-to-markdown/blob/8ce8dbf/lib/unsafe.js#L14>
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*
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* @type {Array<ConstructName>}
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*/
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const constructsWithoutStrikethrough = [
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'autolink',
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'destinationLiteral',
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'destinationRaw',
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'reference',
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'titleQuote',
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'titleApostrophe'
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]
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handleDelete.peek = peekDelete
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/**
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* Create an extension for `mdast-util-from-markdown` to enable GFM
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* strikethrough in markdown.
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*
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* @returns {FromMarkdownExtension}
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* Extension for `mdast-util-from-markdown` to enable GFM strikethrough.
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*/
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export function gfmStrikethroughFromMarkdown() {
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return {
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canContainEols: ['delete'],
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enter: {strikethrough: enterStrikethrough},
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exit: {strikethrough: exitStrikethrough}
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}
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}
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/**
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* Create an extension for `mdast-util-to-markdown` to enable GFM
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* strikethrough in markdown.
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*
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* @returns {ToMarkdownExtension}
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* Extension for `mdast-util-to-markdown` to enable GFM strikethrough.
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*/
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export function gfmStrikethroughToMarkdown() {
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return {
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unsafe: [
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{
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character: '~',
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inConstruct: 'phrasing',
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notInConstruct: constructsWithoutStrikethrough
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}
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],
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handlers: {delete: handleDelete}
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}
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}
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/**
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* @this {CompileContext}
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* @type {FromMarkdownHandle}
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*/
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function enterStrikethrough(token) {
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this.enter({type: 'delete', children: []}, token)
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}
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/**
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* @this {CompileContext}
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* @type {FromMarkdownHandle}
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*/
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function exitStrikethrough(token) {
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this.exit(token)
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}
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/**
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* @type {ToMarkdownHandle}
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* @param {Delete} node
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*/
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function handleDelete(node, _, state, info) {
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const tracker = state.createTracker(info)
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const exit = state.enter('strikethrough')
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let value = tracker.move('~~')
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value += state.containerPhrasing(node, {
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...tracker.current(),
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before: value,
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after: '~'
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})
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value += tracker.move('~~')
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exit()
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return value
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}
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/** @type {ToMarkdownHandle} */
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function peekDelete() {
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return '~'
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}
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