Function parseUnicodeLanguageId

packages/intl-getcanonicallocales/parser.ts:53–94

(
  chunks: string[] | string
)

}

export function parseUnicodeLanguageId(
  chunks: string[] | string
): UnicodeLanguageId {
  if (typeof chunks === 'string') {
    chunks = chunks.split(SEPARATOR)
  }
  const lang = chunks.shift()
  if (!lang) {
    throw new RangeError('Missing unicode_language_subtag')
  }
  if (lang === 'root') {
    return {lang: 'root', variants: []}
  }
  // unicode_language_subtag
  if (!isUnicodeLanguageSubtag(lang)) {
    throw new RangeError('Malformed unicode_language_subtag')
  }
  let script
  // unicode_script_subtag
  if (chunks.length && isUnicodeScriptSubtag(chunks[0])) {
    script = chunks.shift()
  }
  let region
  // unicode_region_subtag
  if (chunks.length && isUnicodeRegionSubtag(chunks[0])) {
    region = chunks.shift()
  }
  const variants: Record<string, any> = {}
  while (chunks.length && isUnicodeVariantSubtag(chunks[0])) {
    const variant: string = chunks.shift()!
    if (variant in variants) {
      throw new RangeError(`Duplicate variant "${variant}"`)
    }
    variants[variant] = 1
  }
  return {
    lang,
    script,
    region,
    variants: Object.keys(variants),
  }
}

function parseUnicodeExtension(chunks: string[]): UnicodeExtension {
  const keywords = []