YamlDotNet.Core.Scanner.ScanTagUri C# (CSharp) Method

        private string ScanTagUri(string head, Mark start)
        {
            var tag = new StringBuilder();
            if (head != null && head.Length > 1)
            {
                tag.Append(head.Substring(1));
            }

            // Scan the tag.

            // The set of characters that may appear in URI is as follows:

            //      '0'-'9', 'A'-'Z', 'a'-'z', '_', '-', ';', '/', '?', ':', '@', '&',
            //      '=', '+', '$', ',', '.', '!', '~', '*', '\'', '(', ')', '[', ']',
            //      '%'.

            while (analyzer.IsAlphaNumericDashOrUnderscore() || analyzer.Check(";/?:@&=+$,.!~*'()[]%"))
            {
                // Check if it is a URI-escape sequence.

                if (analyzer.Check('%'))
                {
                    tag.Append(ScanUriEscapes(start));
                }
                else if (analyzer.Check('+'))
                {
                    tag.Append(' ');
                    Skip();
                }
                else
                {
                    tag.Append(ReadCurrentCharacter());
                }
            }

            // Check if the tag is non-empty.

            if (tag.Length == 0)
            {
                throw new SyntaxErrorException(start, cursor.Mark(), "While parsing a tag, did not find expected tag URI.");
            }

            return tag.ToString();
        }