Token _scanTag()

in lib/src/scanner.dart [995:1036]

• 26 lines of code
• 6 McCabe index (conditional complexity)

  Token _scanTag() {
    String? handle;
    String suffix;
    var start = _scanner.state;

    // Check if the tag is in the canonical form.
    if (_scanner.peekChar(1) == LEFT_ANGLE) {
      // Eat '!<'.
      _scanner.readChar();
      _scanner.readChar();

      handle = '';
      suffix = _scanTagUri();

      _scanner.expect('>');
    } else {
      // The tag has either the '!suffix' or the '!handle!suffix' form.

      // First, try to scan a handle.
      handle = _scanTagHandle();

      if (handle.length > 1 && handle.startsWith('!') && handle.endsWith('!')) {
        suffix = _scanTagUri(flowSeparators: false);
      } else {
        suffix = _scanTagUri(head: handle, flowSeparators: false);

        // There was no explicit handle.
        if (suffix.isEmpty) {
          // This is the special '!' tag.
          handle = null;
          suffix = '!';
        } else {
          handle = '!';
        }
      }
    }

    // libyaml insists on whitespace after a tag, but example 7.2 indicates
    // that it's not required: http://yaml.org/spec/1.2/spec.html#id2786720.

    return TagToken(_scanner.spanFrom(start), handle, suffix);
  }