validate method
Validates whether the provided value meets the minimum length
specified in options.
The value parameter is expected to be a String. The options
parameter should contain at least one element, which is the minimum
length as a String that can be parsed into an int.
Returns true if the value meets or exceeds the minimum length,
otherwise returns false.
Implementation
@override
bool validate(dynamic value, [List<String>? options]) {
// Check if options are provided and not empty.
if (options == null || options.isEmpty) return false;
// Parse the first option as the minimum length.
final minLength = int.tryParse(options[0]);
if (minLength == null) return false;
// Check if the value is a string and meets the minimum length.
if (value is String) {
return value.length >= minLength;
}
// Return false if the value is not a string.
return false;
}