validate method

GrxPostalCodeValidationResult validate({ required String input, required GrxPostalCodeRule rule, bool isRequired = false, })

Implementation

GrxPostalCodeValidationResult validate({
  required String input,
  required GrxPostalCodeRule rule,
  bool isRequired = false,
}) {
  final trimmed = input.trim();

  if (trimmed.isEmpty) {
    if (isRequired) {
      return GrxPostalCodeValidationResult.invalid(rule.hint ?? '');
    }
    return GrxPostalCodeValidationResult.valid;
  }

  final patterns = rule.effectivePatterns;
  if (patterns.isEmpty) {
    return GrxPostalCodeValidationResult.valid;
  }

  final normalized = rule.stripNonDigits
      ? trimmed.replaceAll(RegExp('[^0-9]'), '')
      : trimmed;

  for (final pattern in patterns) {
    if (pattern.isEmpty) continue;
    final regex = RegExp(pattern);
    final match = regex.firstMatch(normalized);
    if (match != null &&
        match.start == 0 &&
        match.end == normalized.length) {
      return GrxPostalCodeValidationResult.valid;
    }
  }

  if (!rule.stripNonDigits && RegExp('[^0-9]').hasMatch(trimmed)) {
    final digitsOnly = trimmed.replaceAll(RegExp('[^0-9]'), '');
    if (digitsOnly.isNotEmpty) {
      for (final pattern in patterns) {
        if (pattern.isEmpty) continue;
        final regex = RegExp(pattern);
        final match = regex.firstMatch(digitsOnly);
        if (match != null &&
            match.start == 0 &&
            match.end == digitsOnly.length) {
          return GrxPostalCodeValidationResult.valid;
        }
      }
    }
  }

  return GrxPostalCodeValidationResult.invalid(rule.hint ?? '');
}