expand method

Implementation

@override
List<Rule> expand() {
  final separator = this.separator;
  String run(String digits) {
    if (separator == null) return '[$digits]+';
    final withSeparator = '$digits${_escapeClass(separator)}';
    return '[$digits](?:[$withSeparator]*[$digits])?';
  }

  final decimal =
      '(?:${run('0-9')}(?:\\.${run('0-9')})?|\\.${run('0-9')})'
      '(?:[eE][+-]?${run('0-9')})?';
  final forms = [
    if (hex) '0[xX]${run('0-9a-fA-F')}',
    if (binary) '0[bB]${run('01')}',
    if (octal) '0[oO]${run('0-7')}',
    decimal,
  ];
  final suffix = this.suffix.isEmpty ? '' : '(?:${this.suffix})';
  return [
    TokenRule(
      '(?<![\\w\$.])(?:${forms.join('|')})$suffix(?![\\w\$])',
      scope: scope,
    ),
  ];
}