121 lines
2.7 KiB
JavaScript
121 lines
2.7 KiB
JavaScript
import assert from 'assert'
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import {markdownLineEnding} 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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// This is a fork of:
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// <https://github.com/micromark/micromark/blob/bf53bf9/lib/tokenize/factory-label.js>
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// to allow empty labels, balanced brackets (such as for nested directives),
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// text instead of strings, and optionally disallows EOLs.
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// eslint-disable-next-line max-params
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export function factoryLabel(
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effects,
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ok,
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nok,
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type,
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markerType,
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stringType,
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disallowEol
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) {
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let size = 0
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let balance = 0
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return start
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function start(code) {
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assert(code === codes.leftSquareBracket, 'expected `[`')
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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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return afterStart
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}
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function afterStart(code) {
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if (code === codes.rightSquareBracket) {
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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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effects.enter(stringType)
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return atBreak(code)
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}
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function atBreak(code) {
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if (code === codes.eof || size > constants.linkReferenceSizeMax) {
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return nok(code)
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}
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if (code === codes.rightSquareBracket && !balance--) {
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return atClosingBrace(code)
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}
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if (markdownLineEnding(code)) {
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if (disallowEol) {
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return nok(code)
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}
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effects.enter(types.lineEnding)
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effects.consume(code)
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effects.exit(types.lineEnding)
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return atBreak
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}
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effects.enter(types.chunkText, {contentType: constants.contentTypeText})
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return label(code)
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}
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function label(code) {
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if (
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code === codes.eof ||
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markdownLineEnding(code) ||
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size > constants.linkReferenceSizeMax
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) {
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effects.exit(types.chunkText)
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return atBreak(code)
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}
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if (
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code === codes.leftSquareBracket &&
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++balance > constants.linkResourceDestinationBalanceMax
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) {
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return nok(code)
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}
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if (code === codes.rightSquareBracket && !balance--) {
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effects.exit(types.chunkText)
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return atClosingBrace(code)
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}
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effects.consume(code)
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return code === codes.backslash ? labelEscape : label
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}
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function atClosingBrace(code) {
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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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function labelEscape(code) {
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if (
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code === codes.leftSquareBracket ||
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code === codes.backslash ||
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code === codes.rightSquareBracket
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) {
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effects.consume(code)
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size++
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return label
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}
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return label(code)
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}
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}
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