15 lines
859 B
TypeScript
15 lines
859 B
TypeScript
import type { JsonValue } from '../json-value.ts'
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import { carryName } from './opaque-carry.ts'
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import { holdsControlCharacter } from './commonmark-grammar.ts'
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import { holdsEntityReference } from './entity-references.ts'
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export type LanguageSlot = { info: string; kind: 'fence' } | { kind: 'attribute' } | { kind: 'none' }
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// spec/flavour.md, The CommonMark blocks: the one slot a codeBlock's language rides.
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export function languageSlot(language: JsonValue | undefined): LanguageSlot {
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if (language === undefined) return { kind: 'none' }
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if (typeof language !== 'string' || language === '' || language === carryName) return { kind: 'attribute' }
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if (/[`\\]/.test(language) || holdsControlCharacter(language) || language !== language.trim() || holdsEntityReference(language)) return { kind: 'attribute' }
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return { info: language, kind: 'fence' }
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}
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