51 lines
2.0 KiB
TypeScript
51 lines
2.0 KiB
TypeScript
import type { AdfAttributes, AttributeKind, AttributeVocabulary } from './adf-document.ts'
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import type { JsonValue } from './json-value.ts'
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import { serializeCanonicalJson } from './canonical-json.ts'
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const bareToken = /^[A-Za-z0-9_-]+$/
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// spec/flavour.md, Attributes.
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const quotedEscapes = /[&<`|]/g
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export function isBareToken(text: string): boolean {
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return bareToken.test(text)
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}
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export function vocabularyPairs(attrs: AdfAttributes, vocabulary: AttributeVocabulary, spelledElsewhere: readonly string[]): [string, string][] | undefined {
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const pairs: [string, string][] = []
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for (const [key, value] of Object.entries(attrs)) {
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if (spelledElsewhere.includes(key)) continue
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const kind = Object.hasOwn(vocabulary, key) ? vocabulary[key] : undefined
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if (kind === undefined) return undefined
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const spelled = spellAttributeValue(value, kind)
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if (spelled === undefined) return undefined
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pairs.push([key, spelled])
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}
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return pairs
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}
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export function spellAttributes(pairs: readonly (readonly [string, string])[]): string {
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if (pairs.length === 0) return ''
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const spelled = [...pairs].sort(([left], [right]) => (left < right ? -1 : 1)).map(([key, value]) => `${key}=${value}`)
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return `{${spelled.join(' ')}}`
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}
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export function spellAttributeValue(value: JsonValue, kind: AttributeKind): string | undefined {
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if (kind === 'json') return spellJsonAttribute(value)
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if (kind === 'boolean') return typeof value === 'boolean' ? `${value}` : undefined
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if (kind === 'number') return typeof value === 'number' ? spellStringAttribute(JSON.stringify(value)) : undefined
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return typeof value === 'string' ? spellStringAttribute(value) : undefined
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}
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export function spellJsonAttribute(value: JsonValue): string {
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return quote(serializeCanonicalJson(value, 'compact'))
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}
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export function spellStringAttribute(text: string): string {
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return isBareToken(text) ? text : quote(text)
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}
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function quote(text: string): string {
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return JSON.stringify(text).replace(quotedEscapes, (character) => `\\u${character.charCodeAt(0).toString(16).padStart(4, '0')}`)
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}
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