Function parseNumberSkeleton

packages/icu-skeleton-parser/number.ts:172–378

(
  tokens: NumberSkeletonToken[]
)

 * https://github.com/unicode-org/icu/blob/master/docs/userguide/format_parse/numbers/skeletons.md#skeleton-stems-and-options
 */
export function parseNumberSkeleton(
  tokens: NumberSkeletonToken[]
): ExtendedNumberFormatOptions {
  let result: ExtendedNumberFormatOptions = {}
  for (const token of tokens) {
    switch (token.stem) {
      case 'percent':
      case '%':
        result.style = 'percent'
        continue
      case '%x100':
        result.style = 'percent'
        result.scale = 100
        continue
      case 'currency':
        result.style = 'currency'
        result.currency = token.options[0]
        continue
      case 'group-off':
      case ',_':
        result.useGrouping = false
        continue
      case 'precision-integer':
      case '.':
        result.maximumFractionDigits = 0
        continue
      case 'measure-unit':
      case 'unit':
        result.style = 'unit'
        result.unit = icuUnitToEcma(token.options[0])
        continue
      case 'compact-short':
      case 'K':
        result.notation = 'compact'
        result.compactDisplay = 'short'
        continue
      case 'compact-long':
      case 'KK':
        result.notation = 'compact'
        result.compactDisplay = 'long'
        continue
      case 'scientific':
        result = {
          ...result,
          notation: 'scientific',
          ...token.options.reduce(
            (all, opt) => ({...all, ...parseNotationOptions(opt)}),
            {}
          ),
        }
        continue
      case 'engineering':
        result = {
          ...result,
          notation: 'engineering',
          ...token.options.reduce(
            (all, opt) => ({...all, ...parseNotationOptions(opt)}),
            {}