errors method

List<GrammarParserError> errors()

Implementation

List<GrammarParserError> errors() {
  if (success) {
    return <GrammarParserError>[];
  }

  String escape(int c) {
    switch (c) {
      case 10:
        return r"\n";
      case 13:
        return r"\r";
      case 09:
        return r"\t";
      case -1:
        return "";
    }
    return new String.fromCharCode(c);
  }

  String getc(int position) {
    if (position < _inputLen) {
      return "'${escape(_input[position])}'";
    }
    return "end of file";
  }

  var errors = <GrammarParserError>[];
  if (_failurePos >= _cursor) {
    var set = new Set<GrammarParserError>();
    set.addAll(_errors);
    for (var error in set) {
      if (error.position >= _failurePos) {
        errors.add(error);
      }
    }
    var names = Set<String?>();
    names.addAll(_expected);
    if (names.contains(null)) {
      var string = getc(_failurePos);
      var message = "Unexpected $string";
      var error = new GrammarParserError(
          GrammarParserError.UNEXPECTED, _failurePos, _failurePos, message);
      errors.add(error);
    } else {
      var found = getc(_failurePos);
      var list = names.toList();
      list.sort();
      var message = "Expected ${list.join(", ")} but found $found";
      var error = new GrammarParserError(
          GrammarParserError.EXPECTED, _failurePos, _failurePos, message);
      errors.add(error);
    }
  }
  errors.sort((a, b) => a.position.compareTo(b.position));
  return errors;
}