126 lines
3 KiB
JavaScript
126 lines
3 KiB
JavaScript
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/**
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* @typedef {import('hast').Element} Element
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* @typedef {import('hast').ElementContent} ElementContent
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* @typedef {import('hast').Properties} Properties
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* @typedef {import('mdast').ListItem} ListItem
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* @typedef {import('mdast').Parents} Parents
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* @typedef {import('../state.js').State} State
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*/
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// Make VS Code show references to the above types.
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''
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/**
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* Turn an mdast `listItem` 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 {ListItem} node
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* mdast node.
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* @param {Parents | undefined} parent
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* Parent of `node`.
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* @returns {Element}
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* hast node.
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*/
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export function listItem(state, node, parent) {
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const results = state.all(node)
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const loose = parent ? listLoose(parent) : listItemLoose(node)
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/** @type {Properties} */
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const properties = {}
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/** @type {Array<ElementContent>} */
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const children = []
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if (typeof node.checked === 'boolean') {
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const head = results[0]
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/** @type {Element} */
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let paragraph
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if (head && head.type === 'element' && head.tagName === 'p') {
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paragraph = head
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} else {
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paragraph = {type: 'element', tagName: 'p', properties: {}, children: []}
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results.unshift(paragraph)
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}
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if (paragraph.children.length > 0) {
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paragraph.children.unshift({type: 'text', value: ' '})
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}
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paragraph.children.unshift({
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type: 'element',
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tagName: 'input',
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properties: {type: 'checkbox', checked: node.checked, disabled: true},
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children: []
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})
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// According to github-markdown-css, this class hides bullet.
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// See: <https://github.com/sindresorhus/github-markdown-css>.
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properties.className = ['task-list-item']
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}
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let index = -1
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while (++index < results.length) {
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const child = results[index]
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// Add eols before nodes, except if this is a loose, first paragraph.
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if (
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loose ||
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index !== 0 ||
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child.type !== 'element' ||
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child.tagName !== 'p'
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) {
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children.push({type: 'text', value: '\n'})
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}
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if (child.type === 'element' && child.tagName === 'p' && !loose) {
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children.push(...child.children)
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} else {
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children.push(child)
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}
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}
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const tail = results[results.length - 1]
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// Add a final eol.
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if (tail && (loose || tail.type !== 'element' || tail.tagName !== 'p')) {
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children.push({type: 'text', value: '\n'})
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}
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/** @type {Element} */
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const result = {type: 'element', tagName: 'li', properties, children}
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state.patch(node, result)
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return state.applyData(node, result)
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}
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/**
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* @param {Parents} node
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* @return {Boolean}
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*/
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function listLoose(node) {
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let loose = false
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if (node.type === 'list') {
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loose = node.spread || false
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const children = node.children
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let index = -1
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while (!loose && ++index < children.length) {
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loose = listItemLoose(children[index])
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}
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}
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return loose
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}
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/**
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* @param {ListItem} node
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* @return {Boolean}
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*/
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function listItemLoose(node) {
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const spread = node.spread
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return spread === null || spread === undefined
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? node.children.length > 1
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: spread
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}
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