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

        internal SyntaxToken ScanXmlString(char terminatingChar, char altTerminatingChar, bool isSingle)
        {
            var precedingTrivia = triviaListPool.Allocate<SyntaxNode>();
            SyntaxToken result;
            var Here = 0;
            var scratch = GetScratch();
            while (CanGetCharAtOffset(Here))
            {
                char c = PeekAheadChar(Here);
                if (c == terminatingChar || c == altTerminatingChar)
                {
                    if (Here > 0)
                    {
                        result = XmlMakeAttributeDataToken(precedingTrivia, Here, scratch);
                        goto CleanUp;
                    }
                    else
                    {
                        if (isSingle)
                        {
                            result = XmlMakeSingleQuoteToken(precedingTrivia, c, isOpening: false);
                        }
                        else
                        {
                            result = XmlMakeDoubleQuoteToken(precedingTrivia, c, isOpening: false);
                        }

                        goto CleanUp;
                    }
                }

                switch (c)
                {
                    case UCH_CR:
                    case UCH_LF:
                        Here = SkipLineBreak(c, Here);
                        scratch.Append(UCH_SPACE);
                        result = XmlMakeAttributeDataToken(precedingTrivia, Here, scratch);
                        goto CleanUp;
                    case UCH_TAB:
                        scratch.Append(UCH_SPACE);
                        Here += 1;
                        break;
                    case '<':
                        // This cannot be in a string. terminate the string.
                        if (Here > 0)
                        {
                            result = XmlMakeAttributeDataToken(precedingTrivia, Here, scratch);
                            goto CleanUp;
                        }
                        else
                        {
                            var data = SyntaxFactory.MissingToken(SyntaxKind.SingleQuoteToken);
                            if (precedingTrivia.Count > 0)
                            {
                                data = ((SyntaxToken)data.WithLeadingTrivia(precedingTrivia.ToList().Node));
                            }

                            var errInfo = ErrorFactory.ErrorInfo(isSingle ? ERRID.ERR_ExpectedSQuote : ERRID.ERR_ExpectedQuote);
                            result = data;
                            ////result = ((SyntaxToken)data.SetDiagnostics(new[]
                            ////{
                            ////    errInfo
                            ////}));
                            goto CleanUp;
                        }
                    case '&':
                        if (Here > 0)
                        {
                            result = XmlMakeAttributeDataToken(precedingTrivia, Here, scratch);
                            goto CleanUp;
                        }
                        else
                        {
                            result = ScanXmlReference(precedingTrivia);
                            goto CleanUp;
                        }

                    default:
                        var xmlCh = ScanXmlChar(Here);
                        if (xmlCh.Length == 0)
                        {
                            // bad char
                            if (Here > 0)
                            {
                                result = XmlMakeAttributeDataToken(precedingTrivia, Here, scratch);
                                goto CleanUp;
                            }
                            else
                            {
                                result = XmlMakeBadToken(precedingTrivia, 1, ERRID.ERR_IllegalChar);
                                goto CleanUp;
                            }
                        }

                        xmlCh.AppendTo(scratch);
                        Here += xmlCh.Length;
                        break;
                }
            }

            // no more chars
            if (Here > 0)
            {
                result = XmlMakeAttributeDataToken(precedingTrivia, Here, scratch);
                goto CleanUp;
            }
            else
            {
                result = MakeEofToken(precedingTrivia);
                goto CleanUp;
            }

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