Function tailoringEntries

packages/intl-collator/compare.ts:324–370

(
  locale: string,
  collation: string,
  visited = new Set<string>()
)

}

function tailoringEntries(
  locale: string,
  collation: string,
  visited = new Set<string>()
): readonly TailoringEntry[] {
  const key = `${locale}|${collation}`
  if (tailoringCache.has(key)) {
    return tailoringCache.get(key)!
  }
  if (visited.has(key)) {
    return []
  }
  visited.add(key)

  const collationData = packedCollation(locale, collation)
  const entries: TailoringEntry[] = []
  const rules = collationData?.rules || []
  let reset: PackedLDMLReset | undefined
  let relations: PackedLDMLRelation[] = []

  function flushRelations() {
    if (reset && relations.length > 0) {
      addTailoredRelationGroup(entries, reset[1], reset[2], relations)
    }
    relations = []
  }

  for (const rule of rules) {
    if (rule[0] === 'setting') {
      // Settings break the current LDML rule chain. Imports contribute their
      // compiled tailoring entries at this point in rule order.
      // https://www.unicode.org/reports/tr35/tr35-collation.html#Collation_Settings
      flushRelations()
      entries.push(...importedTailorings(rule, visited))
    } else if (rule[0] === 'reset') {
      flushRelations()
      reset = rule
    } else if (rule[0] === 'relation') {
      relations.push(rule)
    }
  }
  flushRelations()

  entries.sort((left, right) => right.codePoints.length - left.codePoints.length)
  tailoringCache.set(key, entries)
  return entries
}

function lookupTailoredElements(
  entries: readonly TailoringEntry[],