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142 lines
3.7 KiB
JavaScript
142 lines
3.7 KiB
JavaScript
/**
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* @typedef {import('mdast').ListItem} ListItem
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* @typedef {import('mdast').Paragraph} Paragraph
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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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* @typedef {import('mdast-util-to-markdown').Options} ToMarkdownExtension
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* @typedef {import('mdast-util-to-markdown').Handle} ToMarkdownHandle
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*/
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import {ok as assert} from 'devlop'
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import {defaultHandlers} from 'mdast-util-to-markdown'
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/**
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* Create an extension for `mdast-util-from-markdown` to enable GFM task
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* list items 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 task list items.
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*/
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export function gfmTaskListItemFromMarkdown() {
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return {
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exit: {
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taskListCheckValueChecked: exitCheck,
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taskListCheckValueUnchecked: exitCheck,
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paragraph: exitParagraphWithTaskListItem
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}
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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 task list
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* items 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 task list items.
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*/
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export function gfmTaskListItemToMarkdown() {
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return {
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unsafe: [{atBreak: true, character: '-', after: '[:|-]'}],
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handlers: {listItem: listItemWithTaskListItem}
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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 exitCheck(token) {
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// We’re always in a paragraph, in a list item.
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const node = this.stack[this.stack.length - 2]
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assert(node.type === 'listItem')
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node.checked = token.type === 'taskListCheckValueChecked'
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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 exitParagraphWithTaskListItem(token) {
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const parent = this.stack[this.stack.length - 2]
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if (
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parent &&
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parent.type === 'listItem' &&
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typeof parent.checked === 'boolean'
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) {
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const node = this.stack[this.stack.length - 1]
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assert(node.type === 'paragraph')
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const head = node.children[0]
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if (head && head.type === 'text') {
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const siblings = parent.children
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let index = -1
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/** @type {Paragraph | undefined} */
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let firstParaghraph
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while (++index < siblings.length) {
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const sibling = siblings[index]
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if (sibling.type === 'paragraph') {
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firstParaghraph = sibling
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break
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}
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}
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if (firstParaghraph === node) {
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// Must start with a space or a tab.
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head.value = head.value.slice(1)
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if (head.value.length === 0) {
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node.children.shift()
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} else if (
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node.position &&
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head.position &&
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typeof head.position.start.offset === 'number'
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) {
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head.position.start.column++
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head.position.start.offset++
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node.position.start = Object.assign({}, head.position.start)
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}
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}
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}
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}
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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 {ListItem} node
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*/
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function listItemWithTaskListItem(node, parent, state, info) {
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const head = node.children[0]
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const checkable =
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typeof node.checked === 'boolean' && head && head.type === 'paragraph'
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const checkbox = '[' + (node.checked ? 'x' : ' ') + '] '
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const tracker = state.createTracker(info)
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if (checkable) {
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tracker.move(checkbox)
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}
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let value = defaultHandlers.listItem(node, parent, state, {
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...info,
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...tracker.current()
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})
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if (checkable) {
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value = value.replace(/^(?:[*+-]|\d+\.)([\r\n]| {1,3})/, check)
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}
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return value
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/**
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* @param {string} $0
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* @returns {string}
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*/
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function check($0) {
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return $0 + checkbox
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}
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}
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