validate method

@override bool validate(dynamic value, [ List<String>? options ])

Validates whether the provided value meets the maximum length requirement.

The value is expected to be a String. The options parameter should contain a single element which is the maximum length as a String that can be parsed into an int.

Returns true if the value is a String and its length is less than or equal to the specified maximum length. Returns false if the options parameter is null or empty, if the maximum length cannot be parsed, or if the value is not a String.

Implementation

@override
bool validate(dynamic value, [List<String>? options]) {
  // Check if options are provided and not empty
  if (options == null || options.isEmpty) return false;

  // Try to parse the first option as an integer to get the maximum length
  final maxLength = int.tryParse(options[0]);
  if (maxLength == null) return false;

  // Check if the value is a string and its length does not exceed the maximum length
  if (value is String) {
    return value.length <= maxLength;
  }

  // Return false if the value is not a string
  return false;
}