Microsoft.Language.Xml.Scanner.ScanXmlPIData C# (CSharp) Method

        internal SyntaxToken ScanXmlPIData(ScannerState state)
        {
            // // Scan the PI data after the white space
            // // [16]    PI    ::=    '<?' PITarget (S (Char* - (Char* '?>' Char*)))? '?>'
            // // [17]    PITarget    ::=    Name - (('X' | 'x') ('M' | 'm') ('L' | 'l'))
            Debug.Assert(state == ScannerState.StartProcessingInstruction || state == ScannerState.ProcessingInstruction);

            var precedingTrivia = triviaListPool.Allocate<SyntaxNode>();
            SyntaxToken result;

            if (state == ScannerState.StartProcessingInstruction && CanGetChar())
            {
                var c = PeekChar();
                switch (c)
                {
                    case UCH_CR:
                    case UCH_LF:
                    case ' ':
                    case UCH_TAB:
                        var wsTrivia = ScanXmlTrivia(c);
                        precedingTrivia.AddRange(wsTrivia);
                        break;
                }
            }

            var Here = 0;
            while (CanGetCharAtOffset(Here))
            {
                char c = PeekAheadChar(Here);
                switch (c)
                {
                    case UCH_CR:
                    case UCH_LF:
                        result = XmlMakeProcessingInstructionToken(precedingTrivia.ToList(), Here + LengthOfLineBreak(c, Here));
                        goto CleanUp;
                    case '?':
                        if (CanGetCharAtOffset(Here + 1) && PeekAheadChar(Here + 1) == '>')
                        {
                            //// If valid characters found then return them.
                            if (Here != 0)
                            {
                                result = XmlMakeProcessingInstructionToken(precedingTrivia.ToList(), Here);
                                goto CleanUp;
                            }

                            // // Create token for the '?>' termination sequence
                            result = XmlMakeEndProcessingInstructionToken(precedingTrivia.ToList());
                            goto CleanUp;
                        }

                        goto default;
                    default:
                        var xmlCh = ScanXmlChar(Here);
                        if (xmlCh.Length > 0)
                        {
                            Here += xmlCh.Length;
                            continue;
                        }

                        // bad char
                        if (Here != 0)
                        {
                            result = XmlMakeProcessingInstructionToken(precedingTrivia.ToList(), Here);
                            goto CleanUp;
                        }
                        else
                        {
                            result = XmlMakeBadToken(precedingTrivia.ToList(), 1, ERRID.ERR_IllegalChar);
                            goto CleanUp;
                        }
                }
            }

            // no more chars
            if (Here > 0)
            {
                result = XmlMakeProcessingInstructionToken(precedingTrivia.ToList(), Here);
            }
            else
            {
                result = MakeEofToken(precedingTrivia.ToList());
            }

            CleanUp:
            triviaListPool.Free(precedingTrivia);
            return result;
        }