private bool ReadDoc()

in src/dotnet-svcutil/lib/src/FrameworkFork/Microsoft.Xml/Xml/BinaryXml/XmlBinaryReader.cs [2822:2967]
127 lines of code
67 McCabe index (conditional complexity)

        private bool ReadDoc()
        {
            switch (_nodetype)
            {
                case XmlNodeType.CDATA:
                    FinishCDATA();
                    break;
                case XmlNodeType.EndElement:
                    FinishEndElement();
                    break;
                case XmlNodeType.Element:
                    if (_isEmpty)
                    {
                        FinishEndElement();
                        _isEmpty = false;
                    }
                    break;
            }

        Read:
            // clear existing state
            _nodetype = XmlNodeType.None;
            _mark = -1;
            if (_qnameOther.localname.Length != 0)
                _qnameOther.Clear();

            ClearAttributes();
            _attrCount = 0;
            _valueType = TypeOfString;
            _stringValue = null;
            _hasTypedValue = false;

            _token = NextToken();
            switch (_token)
            {
                case BinXmlToken.EOF:
                    if (_elemDepth > 0)
                        throw new XmlException(ResXml.Xml_UnexpectedEOF1, (string[])null);
                    _state = ScanState.EOF;
                    return false;

                case BinXmlToken.Element:
                    ImplReadElement();
                    break;

                case BinXmlToken.EndElem:
                    ImplReadEndElement();
                    break;

                case BinXmlToken.DocType:
                    ImplReadDoctype();
                    if (_dtdProcessing == DtdProcessing.Ignore)
                        goto Read;
                    // nested, don't report doctype
                    if (_prevNameInfo != null)
                        goto Read;
                    break;

                case BinXmlToken.PI:
                    ImplReadPI();
                    if (_ignorePIs)
                        goto Read;
                    break;

                case BinXmlToken.Comment:
                    ImplReadComment();
                    if (_ignoreComments)
                        goto Read;
                    break;

                case BinXmlToken.CData:
                    ImplReadCDATA();
                    break;

                case BinXmlToken.Nest:
                    ImplReadNest();
                    // parse first token in nested document
                    _sniffed = false;
                    return ReadInit(true);

                case BinXmlToken.EndNest:
                    if (null == _prevNameInfo)
                        goto default;
                    ImplReadEndNest();
                    return ReadDoc();

                case BinXmlToken.XmlText:
                    ImplReadXmlText();
                    break;

                // text values
                case BinXmlToken.SQL_BIT:
                case BinXmlToken.SQL_TINYINT:
                case BinXmlToken.SQL_SMALLINT:
                case BinXmlToken.SQL_INT:
                case BinXmlToken.SQL_BIGINT:
                case BinXmlToken.SQL_REAL:
                case BinXmlToken.SQL_FLOAT:
                case BinXmlToken.SQL_MONEY:
                case BinXmlToken.SQL_SMALLMONEY:
                case BinXmlToken.SQL_DATETIME:
                case BinXmlToken.SQL_SMALLDATETIME:
                case BinXmlToken.SQL_DECIMAL:
                case BinXmlToken.SQL_NUMERIC:
                case BinXmlToken.XSD_DECIMAL:
                case BinXmlToken.SQL_UUID:
                case BinXmlToken.SQL_VARBINARY:
                case BinXmlToken.SQL_BINARY:
                case BinXmlToken.SQL_IMAGE:
                case BinXmlToken.SQL_UDT:
                case BinXmlToken.XSD_KATMAI_DATE:
                case BinXmlToken.XSD_KATMAI_DATETIME:
                case BinXmlToken.XSD_KATMAI_TIME:
                case BinXmlToken.XSD_KATMAI_DATEOFFSET:
                case BinXmlToken.XSD_KATMAI_DATETIMEOFFSET:
                case BinXmlToken.XSD_KATMAI_TIMEOFFSET:
                case BinXmlToken.XSD_BINHEX:
                case BinXmlToken.XSD_BASE64:
                case BinXmlToken.SQL_CHAR:
                case BinXmlToken.SQL_VARCHAR:
                case BinXmlToken.SQL_TEXT:
                case BinXmlToken.SQL_NCHAR:
                case BinXmlToken.SQL_NVARCHAR:
                case BinXmlToken.SQL_NTEXT:
                case BinXmlToken.XSD_BOOLEAN:
                case BinXmlToken.XSD_TIME:
                case BinXmlToken.XSD_DATETIME:
                case BinXmlToken.XSD_DATE:
                case BinXmlToken.XSD_BYTE:
                case BinXmlToken.XSD_UNSIGNEDSHORT:
                case BinXmlToken.XSD_UNSIGNEDINT:
                case BinXmlToken.XSD_UNSIGNEDLONG:
                case BinXmlToken.XSD_QNAME:
                    ImplReadData(_token);
                    if (XmlNodeType.Text == _nodetype)
                        CheckAllowContent();
                    else if (_ignoreWhitespace && !_xmlspacePreserve)
                        goto Read; // skip to next token
                    return true;

                default:
                    throw ThrowUnexpectedToken(_token);
            }

            return true;
        }