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76 lines
1.8 KiB
Text
76 lines
1.8 KiB
Text
/**
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* @typedef {import('micromark-util-types').Construct} Construct
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* @typedef {import('micromark-util-types').Tokenizer} Tokenizer
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* @typedef {import('micromark-util-types').State} State
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* @typedef {import('micromark-util-types').Code} Code
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*/
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import {ok as assert} from 'uvu/assert'
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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} from 'micromark-util-symbol/codes.js'
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import {constants} from 'micromark-util-symbol/constants.js'
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import {types} from 'micromark-util-symbol/types.js'
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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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/** @type {Tokenizer} */
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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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/** @type {State} */
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function start(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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effects.enter(types.thematicBreak)
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marker = code
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return atBreak(code)
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}
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/** @type {State} */
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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 (markdownSpace(code)) {
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return factorySpace(effects, atBreak, types.whitespace)(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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return nok(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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/** @type {State} */
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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 atBreak(code)
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}
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}
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