Function createPartsFromList

packages/intl-listformat/index.ts:127–162

(
  internalSlotMap: WeakMap<ListFormat, ListFormatInternal>,
  lf: ListFormat,
  list: string[]
)

}

function createPartsFromList(
  internalSlotMap: WeakMap<ListFormat, ListFormatInternal>,
  lf: ListFormat,
  list: string[]
) {
  const size = list.length
  if (size === 0) {
    return []
  }
  if (size === 2) {
    const pattern = getInternalSlot(internalSlotMap, lf, 'templatePair')
    const first = {type: 'element', value: list[0]}
    const second = {type: 'element', value: list[1]}
    return deconstructPattern(pattern, {'0': first, '1': second})
  }
  const last = {
    type: 'element',
    value: list[size - 1],
  }
  let parts: Placeable[] | Placeable = last
  let i = size - 2
  while (i >= 0) {
    let pattern
    if (i === 0) {
      pattern = getInternalSlot(internalSlotMap, lf, 'templateStart')
    } else if (i < size - 2) {
      pattern = getInternalSlot(internalSlotMap, lf, 'templateMiddle')
    } else {
      pattern = getInternalSlot(internalSlotMap, lf, 'templateEnd')
    }
    const head = {type: 'element', value: list[i]}
    parts = deconstructPattern(pattern, {'0': head, '1': parts})
    i--
  }
  return parts
}

function deconstructPattern(
  pattern: string,