108 lines
2.2 KiB
JavaScript
108 lines
2.2 KiB
JavaScript
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/**
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* @typedef {import('micromark-util-types').Construct} Construct
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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 {codes, types} from 'micromark-util-symbol'
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import {ok as assert} from 'devlop'
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import {labelEnd} from './label-end.js'
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/** @type {Construct} */
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export const labelStartImage = {
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name: 'labelStartImage',
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tokenize: tokenizeLabelStartImage,
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resolveAll: labelEnd.resolveAll
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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 tokenizeLabelStartImage(effects, ok, nok) {
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const self = this
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return start
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/**
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* Start of label (image) start.
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*
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* ```markdown
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* > | a ![b] c
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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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assert(code === codes.exclamationMark, 'expected `!`')
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effects.enter(types.labelImage)
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effects.enter(types.labelImageMarker)
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effects.consume(code)
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effects.exit(types.labelImageMarker)
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return open
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}
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/**
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* After `!`, at `[`.
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*
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* ```markdown
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* > | a ![b] c
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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 open(code) {
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if (code === codes.leftSquareBracket) {
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effects.enter(types.labelMarker)
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effects.consume(code)
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effects.exit(types.labelMarker)
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effects.exit(types.labelImage)
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return after
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}
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return nok(code)
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}
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/**
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* After `![`.
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*
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* ```markdown
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* > | a ![b] c
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* ^
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* ```
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*
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* This is needed in because, when GFM footnotes are enabled, images never
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* form when started with a `^`.
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* Instead, links form:
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*
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* ```markdown
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* 
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*
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* ![^a][b]
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*
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* [b]: c
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* ```
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*
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* ```html
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* <p>!<a href=\"b\">^a</a></p>
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* <p>!<a href=\"c\">^a</a></p>
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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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// To do: use a new field to do this, this is still needed for
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// `micromark-extension-gfm-footnote`, but the `label-start-link`
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// behavior isn’t.
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// Hidden footnotes hook.
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/* c8 ignore next 3 */
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return code === codes.caret &&
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'_hiddenFootnoteSupport' in self.parser.constructs
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? nok(code)
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: ok(code)
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}
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}
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