ShaderTools.Hlsl.Parser.HlslLexer.ReadToken C# (CSharp) Method

        private void ReadToken()
        {
            switch (_charReader.Current)
            {
                case '\0':
                    if (_includeStack.Count == 1 && _directives.HasUnfinishedIf())
                        _diagnostics.Add(Diagnostic.Format(CurrentSpanStart, DiagnosticId.EndIfDirectiveExpected));
                    _kind = SyntaxKind.EndOfFileToken;
                    break;

                case '~':
                    _kind = SyntaxKind.TildeToken;
                    NextChar();
                    break;

                case '&':
                    NextChar();
                    if (_charReader.Current == '&')
                    {
                        _kind = SyntaxKind.AmpersandAmpersandToken;
                        NextChar();
                    }
                    else if (_charReader.Current == '=')
                    {
                        _kind = SyntaxKind.AmpersandEqualsToken;
                        NextChar();
                    }
                    else
                    {
                        _kind = SyntaxKind.AmpersandToken;
                    }
                    break;

                case '|':
                    NextChar();
                    if (_charReader.Current == '|')
                    {
                        _kind = SyntaxKind.BarBarToken;
                        NextChar();
                    }
                    else if (_charReader.Current == '=')
                    {
                        _kind = SyntaxKind.BarEqualsToken;
                        NextChar();
                    }
                    else
                    {
                        _kind = SyntaxKind.BarToken;
                    }
                    break;

                case '^':
                    NextChar();
                    if (_charReader.Current == '=')
                    {
                        _kind = SyntaxKind.CaretEqualsToken;
                        NextChar();
                    }
                    else
                    {
                        _kind = SyntaxKind.CaretToken;
                    }
                    break;

                case '?':
                    _kind = SyntaxKind.QuestionToken;
                    NextChar();
                    break;

                case '(':
                    _kind = SyntaxKind.OpenParenToken;
                    NextChar();
                    break;

                case ')':
                    _kind = SyntaxKind.CloseParenToken;
                    NextChar();
                    break;

                case '[':
                    _kind = SyntaxKind.OpenBracketToken;
                    NextChar();
                    break;

                case ']':
                    _kind = SyntaxKind.CloseBracketToken;
                    NextChar();
                    break;

                case '{':
                    _kind = SyntaxKind.OpenBraceToken;
                    NextChar();
                    break;

                case '}':
                    _kind = SyntaxKind.CloseBraceToken;
                    NextChar();
                    break;

                case '.':
                    if (Char.IsDigit(_charReader.Peek()))
                        ReadNumber();
                    else
                    {
                        _kind = SyntaxKind.DotToken;
                        NextChar();
                    }
                    break;

                case '+':
                    NextChar();
                    if (_charReader.Current == '=')
                    {
                        _kind = SyntaxKind.PlusEqualsToken;
                        NextChar();
                    }
                    else if (_charReader.Current == '+')
                    {
                        _kind = SyntaxKind.PlusPlusToken;
                        NextChar();
                    }
                    else
                    {
                        _kind = SyntaxKind.PlusToken;
                    }
                    break;

                case '-':
                    NextChar();
                    if (_charReader.Current == '=')
                    {
                        _kind = SyntaxKind.MinusEqualsToken;
                        NextChar();
                    }
                    else if (_charReader.Current == '-')
                    {
                        _kind = SyntaxKind.MinusMinusToken;
                        NextChar();
                    }
                    else
                    {
                        _kind = SyntaxKind.MinusToken;
                    }
                    break;

                case '*':
                    NextChar();
                    if (_charReader.Current == '=')
                    {
                        _kind = SyntaxKind.AsteriskEqualsToken;
                        NextChar();
                    }
                    else
                    {
                        _kind = SyntaxKind.AsteriskToken;
                    }
                    break;

                case '/':
                    NextChar();
                    if (_charReader.Current == '=')
                    {
                        _kind = SyntaxKind.SlashEqualsToken;
                        NextChar();
                    }
                    else
                    {
                        _kind = SyntaxKind.SlashToken;
                    }
                    break;

                case '%':
                    NextChar();
                    if (_charReader.Current == '=')
                    {
                        _kind = SyntaxKind.PercentEqualsToken;
                        NextChar();
                    }
                    else
                    {
                        _kind = SyntaxKind.PercentToken;
                    }
                    break;

                case ',':
                    _kind = SyntaxKind.CommaToken;
                    NextChar();
                    break;

                case ';':
                    _kind = SyntaxKind.SemiToken;
                    NextChar();
                    break;

                case ':':
                    NextChar();
                    if (_charReader.Current == ':')
                    {
                        _kind = SyntaxKind.ColonColonToken;
                        NextChar();
                    }
                    else
                    {
                        _kind = SyntaxKind.ColonToken;
                    }
                    break;

                case '=':
                    NextChar();
                    if (_charReader.Current == '=')
                    {
                        _kind = SyntaxKind.EqualsEqualsToken;
                        NextChar();
                    }
                    else
                    {
                        _kind = SyntaxKind.EqualsToken;
                    }
                    break;

                case '!':
                    NextChar();
                    if (_charReader.Current == '=')
                    {
                        _kind = SyntaxKind.ExclamationEqualsToken;
                        NextChar();
                    }
                    else
                    {
                        _kind = SyntaxKind.NotToken;
                    }
                    break;

                case '<':
                    NextChar();
                    if (_charReader.Current == '=')
                    {
                        _kind = SyntaxKind.LessThanEqualsToken;
                        NextChar();
                    }
                    else if (_charReader.Current == '<')
                    {
                        NextChar();
                        if (_charReader.Current == '=')
                        {
                            _kind = SyntaxKind.LessThanLessThanEqualsToken;
                            NextChar();
                        }
                        else
                        {
                            _kind = SyntaxKind.LessThanLessThanToken;
                        }
                    }
                    else
                    {
                        _kind = SyntaxKind.LessThanToken;
                    }
                    break;

                case '>':
                    NextChar();
                    if (_charReader.Current == '=')
                    {
                        _kind = SyntaxKind.GreaterThanEqualsToken;
                        NextChar();
                    }
                    else if (_charReader.Current == '>')
                    {
                        NextChar();
                        if (_charReader.Current == '=')
                        {
                            _kind = SyntaxKind.GreaterThanGreaterThanEqualsToken;
                            NextChar();
                        }
                        else
                        {
                            _kind = SyntaxKind.GreaterThanGreaterThanToken;
                        }
                    }
                    else
                    {
                        _kind = SyntaxKind.GreaterThanToken;
                    }
                    break;

                case '"':
                    ReadString();
                    break;

                default:
                    if (Char.IsLetter(_charReader.Current) || _charReader.Current == '_')
                        ReadIdentifierOrKeyword();
                    else if (Char.IsDigit(_charReader.Current))
                        ReadNumber();
                    else
                        ReadInvalidCharacter();

                    break;
            }
        }