183 lines
4.4 KiB
Plaintext
183 lines
4.4 KiB
Plaintext
/**
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* @typedef {import('micromark-util-types').Code} Code
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* @typedef {import('micromark-util-types').Construct} Construct
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* @typedef {import('micromark-util-types').Resolver} Resolver
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* @typedef {import('micromark-util-types').State} State
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* @typedef {import('micromark-util-types').TokenizeContext} TokenizeContext
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* @typedef {import('micromark-util-types').Tokenizer} Tokenizer
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*/
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import {factorySpace} from 'micromark-factory-space'
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import {markdownLineEnding, markdownSpace} from 'micromark-util-character'
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/** @type {Construct} */
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export const setextUnderline = {
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name: 'setextUnderline',
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tokenize: tokenizeSetextUnderline,
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resolveTo: resolveToSetextUnderline
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}
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/** @type {Resolver} */
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function resolveToSetextUnderline(events, context) {
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// To do: resolve like `markdown-rs`.
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let index = events.length
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/** @type {number | undefined} */
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let content
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/** @type {number | undefined} */
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let text
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/** @type {number | undefined} */
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let definition
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// Find the opening of the content.
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// It’ll always exist: we don’t tokenize if it isn’t there.
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while (index--) {
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if (events[index][0] === 'enter') {
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if (events[index][1].type === 'content') {
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content = index
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break
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}
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if (events[index][1].type === 'paragraph') {
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text = index
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}
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}
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// Exit
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else {
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if (events[index][1].type === 'content') {
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// Remove the content end (if needed we’ll add it later)
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events.splice(index, 1)
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}
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if (!definition && events[index][1].type === 'definition') {
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definition = index
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}
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}
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}
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const heading = {
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type: 'setextHeading',
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start: Object.assign({}, events[text][1].start),
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end: Object.assign({}, events[events.length - 1][1].end)
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}
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// Change the paragraph to setext heading text.
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events[text][1].type = 'setextHeadingText'
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// If we have definitions in the content, we’ll keep on having content,
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// but we need move it.
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if (definition) {
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events.splice(text, 0, ['enter', heading, context])
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events.splice(definition + 1, 0, ['exit', events[content][1], context])
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events[content][1].end = Object.assign({}, events[definition][1].end)
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} else {
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events[content][1] = heading
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}
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// Add the heading exit at the end.
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events.push(['exit', heading, context])
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return events
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}
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/**
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* @this {TokenizeContext}
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* @type {Tokenizer}
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*/
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function tokenizeSetextUnderline(effects, ok, nok) {
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const self = this
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/** @type {NonNullable<Code>} */
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let marker
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return start
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/**
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* At start of heading (setext) underline.
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*
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* ```markdown
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* | aa
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* > | ==
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* ^
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* ```
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*
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* @type {State}
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*/
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function start(code) {
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let index = self.events.length
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/** @type {boolean | undefined} */
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let paragraph
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// Find an opening.
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while (index--) {
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// Skip enter/exit of line ending, line prefix, and content.
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// We can now either have a definition or a paragraph.
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if (
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self.events[index][1].type !== 'lineEnding' &&
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self.events[index][1].type !== 'linePrefix' &&
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self.events[index][1].type !== 'content'
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) {
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paragraph = self.events[index][1].type === 'paragraph'
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break
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}
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}
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// To do: handle lazy/pierce like `markdown-rs`.
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// To do: parse indent like `markdown-rs`.
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if (!self.parser.lazy[self.now().line] && (self.interrupt || paragraph)) {
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effects.enter('setextHeadingLine')
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marker = code
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return before(code)
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}
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return nok(code)
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}
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/**
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* After optional whitespace, at `-` or `=`.
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*
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* ```markdown
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* | aa
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* > | ==
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* ^
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* ```
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*
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* @type {State}
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*/
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function before(code) {
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effects.enter('setextHeadingLineSequence')
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return inside(code)
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}
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/**
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* In sequence.
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*
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* ```markdown
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* | aa
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* > | ==
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* ^
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* ```
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*
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* @type {State}
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*/
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function inside(code) {
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if (code === marker) {
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effects.consume(code)
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return inside
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}
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effects.exit('setextHeadingLineSequence')
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return markdownSpace(code)
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? factorySpace(effects, after, 'lineSuffix')(code)
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: after(code)
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}
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/**
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* After sequence, after optional whitespace.
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*
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* ```markdown
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* | aa
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* > | ==
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* ^
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* ```
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*
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* @type {State}
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*/
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function after(code) {
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if (code === null || markdownLineEnding(code)) {
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effects.exit('setextHeadingLine')
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return ok(code)
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}
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return nok(code)
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}
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}
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