String _toRegExp()

in lib/src/ast.dart [313:340]

• 21 lines of code
• 7 McCabe index (conditional complexity)

  String _toRegExp() {
    var buffer = StringBuffer();

    var containsSeparator = ranges.any((range) => range.contains(_separator));
    if (!negated && containsSeparator) {
      // Add `(?!/)` because ranges are never allowed to match separators.
      buffer.write('(?!/)');
    }

    buffer.write('[');
    if (negated) {
      buffer.write('^');
      // If the range doesn't itself exclude separators, exclude them ourselves,
      // since ranges are never allowed to match them.
      if (!containsSeparator) buffer.write('/');
    }

    for (var range in ranges) {
      var start = String.fromCharCodes([range.min]);
      buffer.write(regExpQuote(start));
      if (range.isSingleton) continue;
      buffer.write('-');
      buffer.write(regExpQuote(String.fromCharCodes([range.max])));
    }

    buffer.write(']');
    return buffer.toString();
  }