301 lines
8.0 KiB
Plaintext
301 lines
8.0 KiB
Plaintext
/**
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* @typedef {import('mdast').InlineCode} InlineCode
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* @typedef {import('mdast').Table} Table
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* @typedef {import('mdast').TableCell} TableCell
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* @typedef {import('mdast').TableRow} TableRow
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*
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* @typedef {import('markdown-table').Options} MarkdownTableOptions
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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').Options} ToMarkdownExtension
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* @typedef {import('mdast-util-to-markdown').Handle} ToMarkdownHandle
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* @typedef {import('mdast-util-to-markdown').State} State
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* @typedef {import('mdast-util-to-markdown').Info} Info
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*/
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/**
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* @typedef Options
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* Configuration.
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* @property {boolean | null | undefined} [tableCellPadding=true]
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* Whether to add a space of padding between delimiters and cells (default:
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* `true`).
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* @property {boolean | null | undefined} [tablePipeAlign=true]
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* Whether to align the delimiters (default: `true`).
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* @property {MarkdownTableOptions['stringLength'] | null | undefined} [stringLength]
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* Function to detect the length of table cell content, used when aligning
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* the delimiters between cells (optional).
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*/
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import {ok as assert} from 'devlop'
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import {markdownTable} from 'markdown-table'
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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 tables in
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* markdown.
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*
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* @returns {FromMarkdownExtension}
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* Extension for `mdast-util-from-markdown` to enable GFM tables.
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*/
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export function gfmTableFromMarkdown() {
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return {
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enter: {
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table: enterTable,
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tableData: enterCell,
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tableHeader: enterCell,
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tableRow: enterRow
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},
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exit: {
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codeText: exitCodeText,
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table: exitTable,
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tableData: exit,
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tableHeader: exit,
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tableRow: exit
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}
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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 enterTable(token) {
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const align = token._align
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assert(align, 'expected `_align` on table')
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this.enter(
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{
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type: 'table',
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align: align.map(function (d) {
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return d === 'none' ? null : d
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}),
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children: []
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},
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token
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)
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this.data.inTable = true
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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 exitTable(token) {
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this.exit(token)
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this.data.inTable = undefined
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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 enterRow(token) {
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this.enter({type: 'tableRow', 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 exit(token) {
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this.exit(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 enterCell(token) {
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this.enter({type: 'tableCell', children: []}, token)
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}
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// Overwrite the default code text data handler to unescape escaped pipes when
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// they are in tables.
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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 exitCodeText(token) {
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let value = this.resume()
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if (this.data.inTable) {
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value = value.replace(/\\([\\|])/g, replace)
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}
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const node = this.stack[this.stack.length - 1]
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assert(node.type === 'inlineCode')
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node.value = value
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this.exit(token)
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}
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/**
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* @param {string} $0
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* @param {string} $1
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* @returns {string}
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*/
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function replace($0, $1) {
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// Pipes work, backslashes don’t (but can’t escape pipes).
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return $1 === '|' ? $1 : $0
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}
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/**
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* Create an extension for `mdast-util-to-markdown` to enable GFM tables in
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* markdown.
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*
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* @param {Options | null | undefined} [options]
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* Configuration.
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* @returns {ToMarkdownExtension}
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* Extension for `mdast-util-to-markdown` to enable GFM tables.
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*/
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export function gfmTableToMarkdown(options) {
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const settings = options || {}
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const padding = settings.tableCellPadding
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const alignDelimiters = settings.tablePipeAlign
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const stringLength = settings.stringLength
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const around = padding ? ' ' : '|'
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return {
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unsafe: [
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{character: '\r', inConstruct: 'tableCell'},
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{character: '\n', inConstruct: 'tableCell'},
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// A pipe, when followed by a tab or space (padding), or a dash or colon
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// (unpadded delimiter row), could result in a table.
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{atBreak: true, character: '|', after: '[\t :-]'},
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// A pipe in a cell must be encoded.
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{character: '|', inConstruct: 'tableCell'},
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// A colon must be followed by a dash, in which case it could start a
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// delimiter row.
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{atBreak: true, character: ':', after: '-'},
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// A delimiter row can also start with a dash, when followed by more
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// dashes, a colon, or a pipe.
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// This is a stricter version than the built in check for lists, thematic
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// breaks, and setex heading underlines though:
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// <https://github.com/syntax-tree/mdast-util-to-markdown/blob/51a2038/lib/unsafe.js#L57>
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{atBreak: true, character: '-', after: '[:|-]'}
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],
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handlers: {
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inlineCode: inlineCodeWithTable,
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table: handleTable,
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tableCell: handleTableCell,
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tableRow: handleTableRow
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}
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}
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/**
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* @type {ToMarkdownHandle}
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* @param {Table} node
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*/
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function handleTable(node, _, state, info) {
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return serializeData(handleTableAsData(node, state, info), node.align)
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}
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/**
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* This function isn’t really used normally, because we handle rows at the
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* table level.
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* But, if someone passes in a table row, this ensures we make somewhat sense.
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*
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* @type {ToMarkdownHandle}
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* @param {TableRow} node
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*/
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function handleTableRow(node, _, state, info) {
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const row = handleTableRowAsData(node, state, info)
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const value = serializeData([row])
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// `markdown-table` will always add an align row
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return value.slice(0, value.indexOf('\n'))
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}
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/**
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* @type {ToMarkdownHandle}
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* @param {TableCell} node
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*/
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function handleTableCell(node, _, state, info) {
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const exit = state.enter('tableCell')
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const subexit = state.enter('phrasing')
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const value = state.containerPhrasing(node, {
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...info,
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before: around,
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after: around
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})
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subexit()
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exit()
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return value
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}
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/**
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* @param {Array<Array<string>>} matrix
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* @param {Array<string | null | undefined> | null | undefined} [align]
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*/
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function serializeData(matrix, align) {
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return markdownTable(matrix, {
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align,
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// @ts-expect-error: `markdown-table` types should support `null`.
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alignDelimiters,
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// @ts-expect-error: `markdown-table` types should support `null`.
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padding,
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// @ts-expect-error: `markdown-table` types should support `null`.
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stringLength
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})
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}
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/**
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* @param {Table} node
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* @param {State} state
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* @param {Info} info
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*/
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function handleTableAsData(node, state, info) {
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const children = node.children
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let index = -1
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/** @type {Array<Array<string>>} */
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const result = []
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const subexit = state.enter('table')
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while (++index < children.length) {
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result[index] = handleTableRowAsData(children[index], state, info)
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}
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subexit()
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return result
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}
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/**
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* @param {TableRow} node
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* @param {State} state
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* @param {Info} info
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*/
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function handleTableRowAsData(node, state, info) {
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const children = node.children
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let index = -1
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/** @type {Array<string>} */
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const result = []
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const subexit = state.enter('tableRow')
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while (++index < children.length) {
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// Note: the positional info as used here is incorrect.
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// Making it correct would be impossible due to aligning cells?
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// And it would need copy/pasting `markdown-table` into this project.
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result[index] = handleTableCell(children[index], node, state, info)
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}
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subexit()
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return result
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}
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/**
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* @type {ToMarkdownHandle}
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* @param {InlineCode} node
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*/
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function inlineCodeWithTable(node, parent, state) {
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let value = defaultHandlers.inlineCode(node, parent, state)
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if (state.stack.includes('tableCell')) {
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value = value.replace(/\|/g, '\\$&')
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}
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return value
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}
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}
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