parse method

@override int parse(String input)

Parses input and returns the numeric value.

Throws FormatException when input cannot be parsed by this codec.

Implementation

@override
int parse(String input) {
  var text = _normalize(input);
  if (text.isEmpty) {
    throw FormatException('Expected a Spanish cardinal number.', input);
  }

  var negative = false;
  if (text.startsWith('menos ')) {
    negative = true;
    text = text.substring('menos '.length);
    if (text.isEmpty) {
      throw FormatException('Expected a Spanish cardinal number.', input);
    }
  }

  final tokens = text.split(' ');
  if (tokens.length == 1 && tokens.single == 'cero') return 0;
  if (tokens.contains('cero')) {
    throw FormatException('Unexpected Spanish cardinal token.', input);
  }

  final value = _parseLarge(tokens, input, _billion * 1000000);
  if (value == 0 || value > _maxValue) {
    throw FormatException('Unexpected Spanish cardinal token.', input);
  }
  return negative ? -value : value;
}