extractPluralCategories static method

List<String>? extractPluralCategories(
  1. String message
)

Categories used in the first (outermost) {var, plural, …} expression in message, in source order. Returns null if no plural expression is found.

Examples: '{n, plural, =0{x} =1{y} other{z}}' → ['=0', '=1', 'other']. 'Hello {name}' → null. '{n, plural, zero{…} one{…} two{…} few{…} many{…} other{…}}' → ['zero', 'one', 'two', 'few', 'many', 'other'].

Implementation

static List<String>? extractPluralCategories(String message) {
  List<String>? found;
  _walk(message, (expr) {
    if (found != null) return;
    if (expr.type == 'plural' || expr.type == 'selectordinal') {
      found = expr.branches!.map((b) => b.name).toList();
    }
  });
  return found;
}