Function getCaseIndex

packages/core/src/render3/i18n/i18n_apply.ts:582–601

* Returns the index of the current case of an ICU expression depending on the main binding value * * @param icuExpression * @param bindingValue The value of the main binding used by this ICU expression

(icuExpression: TIcu, bindingValue: string)

 * @param bindingValue The value of the main binding used by this ICU expression
 */
function getCaseIndex(icuExpression: TIcu, bindingValue: string): number | null {
  let index = icuExpression.cases.indexOf(bindingValue);
  if (index === -1) {
    switch (icuExpression.type) {
      case IcuType.plural: {
        const resolvedCase = getPluralCase(bindingValue, getLocaleId());
        index = icuExpression.cases.indexOf(resolvedCase);
        if (index === -1 && resolvedCase !== 'other') {
          index = icuExpression.cases.indexOf('other');
        }
        break;
      }
      case IcuType.select: {
        index = icuExpression.cases.indexOf('other');
        break;
      }
    }
  }
  return index === -1 ? null : index;
}