118 lines
2.3 KiB
JavaScript
118 lines
2.3 KiB
JavaScript
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/**
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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').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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import {codes, constants, types} from 'micromark-util-symbol'
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import {ok as assert} from 'devlop'
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/** @type {Construct} */
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export const thematicBreak = {
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name: 'thematicBreak',
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tokenize: tokenizeThematicBreak
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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 tokenizeThematicBreak(effects, ok, nok) {
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let size = 0
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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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* Start of thematic break.
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*
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* ```markdown
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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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effects.enter(types.thematicBreak)
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// To do: parse indent like `markdown-rs`.
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return before(code)
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}
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/**
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* After optional whitespace, at marker.
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*
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* ```markdown
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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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assert(
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code === codes.asterisk ||
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code === codes.dash ||
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code === codes.underscore,
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'expected `*`, `-`, or `_`'
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)
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marker = code
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return atBreak(code)
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}
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/**
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* After something, before something else.
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*
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* ```markdown
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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 atBreak(code) {
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if (code === marker) {
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effects.enter(types.thematicBreakSequence)
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return sequence(code)
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}
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if (
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size >= constants.thematicBreakMarkerCountMin &&
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(code === codes.eof || markdownLineEnding(code))
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) {
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effects.exit(types.thematicBreak)
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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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* In sequence.
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*
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* ```markdown
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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 sequence(code) {
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if (code === marker) {
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effects.consume(code)
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size++
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return sequence
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}
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effects.exit(types.thematicBreakSequence)
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return markdownSpace(code)
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? factorySpace(effects, atBreak, types.whitespace)(code)
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: atBreak(code)
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}
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}
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