Token? _scanDirective()

in lib/src/scanner.dart [839:874]

• 25 lines of code
• 5 McCabe index (conditional complexity)

  Token? _scanDirective() {
    var start = _scanner.state;

    // Eat '%'.
    _scanner.readChar();

    Token token;
    var name = _scanDirectiveName();
    if (name == 'YAML') {
      token = _scanVersionDirectiveValue(start);
    } else if (name == 'TAG') {
      token = _scanTagDirectiveValue(start);
    } else {
      warn('Warning: unknown directive.', _scanner.spanFrom(start));

      // libyaml doesn't support unknown directives, but the spec says to ignore
      // them and warn: http://yaml.org/spec/1.2/spec.html#id2781147.
      while (!_isBreakOrEnd) {
        _scanner.readChar();
      }

      return null;
    }

    // Eat the rest of the line, including any comments.
    _skipBlanks();
    _skipComment();

    if (!_isBreakOrEnd) {
      throw YamlException('Expected comment or line break after directive.',
          _scanner.spanFrom(start));
    }

    _skipLine();
    return token;
  }