160 lines
3.4 KiB
JavaScript
160 lines
3.4 KiB
JavaScript
/**
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* @typedef {import('micromark-util-types').Effects} Effects
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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').TokenType} TokenType
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*/
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import {markdownLineEnding, markdownSpace} from 'micromark-util-character'
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/**
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* Parse labels.
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*
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* > 👉 **Note**: labels in markdown are capped at 999 characters in the string.
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*
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* ###### Examples
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*
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* ```markdown
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* [a]
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* [a
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* b]
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* [a\]b]
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* ```
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*
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* @this {TokenizeContext}
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* Tokenize context.
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* @param {Effects} effects
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* Context.
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* @param {State} ok
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* State switched to when successful.
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* @param {State} nok
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* State switched to when unsuccessful.
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* @param {TokenType} type
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* Type of the whole label (`[a]`).
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* @param {TokenType} markerType
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* Type for the markers (`[` and `]`).
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* @param {TokenType} stringType
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* Type for the identifier (`a`).
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* @returns {State}
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* Start state.
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*/ // eslint-disable-next-line max-params
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export function factoryLabel(effects, ok, nok, type, markerType, stringType) {
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const self = this
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let size = 0
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/** @type {boolean} */
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let seen
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return start
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/**
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* Start of label.
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*
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* ```markdown
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* > | [a]
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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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effects.enter(type)
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effects.enter(markerType)
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effects.consume(code)
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effects.exit(markerType)
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effects.enter(stringType)
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return atBreak
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}
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/**
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* In label, at something, before something else.
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*
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* ```markdown
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* > | [a]
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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 atBreak(code) {
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if (
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size > 999 ||
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code === null ||
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code === 91 ||
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(code === 93 && !seen) ||
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// To do: remove in the future once we’ve switched from
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// `micromark-extension-footnote` to `micromark-extension-gfm-footnote`,
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// which doesn’t need this.
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// Hidden footnotes hook.
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/* c8 ignore next 3 */
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(code === 94 &&
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!size &&
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'_hiddenFootnoteSupport' in self.parser.constructs)
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) {
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return nok(code)
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}
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if (code === 93) {
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effects.exit(stringType)
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effects.enter(markerType)
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effects.consume(code)
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effects.exit(markerType)
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effects.exit(type)
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return ok
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}
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// To do: indent? Link chunks and EOLs together?
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if (markdownLineEnding(code)) {
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effects.enter('lineEnding')
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effects.consume(code)
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effects.exit('lineEnding')
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return atBreak
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}
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effects.enter('chunkString', {
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contentType: 'string'
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})
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return labelInside(code)
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}
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/**
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* In label, in text.
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*
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* ```markdown
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* > | [a]
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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 labelInside(code) {
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if (
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code === null ||
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code === 91 ||
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code === 93 ||
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markdownLineEnding(code) ||
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size++ > 999
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) {
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effects.exit('chunkString')
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return atBreak(code)
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}
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effects.consume(code)
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if (!seen) seen = !markdownSpace(code)
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return code === 92 ? labelEscape : labelInside
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}
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/**
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* After `\`, at a special character.
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*
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* ```markdown
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* > | [a\*a]
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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 labelEscape(code) {
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if (code === 91 || code === 92 || code === 93) {
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effects.consume(code)
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size++
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return labelInside
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}
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return labelInside(code)
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}
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}
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