17737836230

Committed 15 Sep 2025 03:12PM UTC coverage: 2.092% (-76.2%) from 78.245%

Build # 17737836230

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github

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web-flow

Commit Message

Merge pull request #790 from DomCR/addflag-refactor

addflag refactor

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/src/ACadSharp/IO/DXF/DxfStreamReader/DxfTablesSectionReader.cs

﻿using ACadSharp.Exceptions;
using ACadSharp.IO.Templates;
using ACadSharp.Tables;
using ACadSharp.Tables.Collections;
using ACadSharp.Types.Units;
using ACadSharp.XData;
using CSMath;
using CSUtilities.Extensions;
using System;
using System.Collections.Generic;
using System.Diagnostics;
using static ACadSharp.IO.Templates.CadLineTypeTemplate;

namespace ACadSharp.IO.DXF
{
        internal class DxfTablesSectionReader : DxfSectionReaderBase
        {
                public delegate bool ReadEntryDelegate<T>(CadTableEntryTemplate<T> template, DxfClassMap map) where T : TableEntry;

                public DxfTablesSectionReader(IDxfStreamReader reader, DxfDocumentBuilder builder)
                        : base(reader, builder)
                {
                }

                public override void Read()
                {
                        //Advance to the first value in the section
                        this._reader.ReadNext();

                        //Loop until the section ends
                        while (this._reader.ValueAsString != DxfFileToken.EndSection)
                        {

                                if (this._reader.ValueAsString == DxfFileToken.TableEntry)
                                        this.readTable();
                                else
                                        throw new DxfException($"Unexpected token at the beginning of a table: {this._reader.ValueAsString}", this._reader.Position);


                                if (this._reader.ValueAsString == DxfFileToken.EndTable)
                                        this._reader.ReadNext();
                                else
                                        throw new DxfException($"Unexpected token at the end of a table: {this._reader.ValueAsString}", this._reader.Position);
                        }
                }

                private void readTable()
                {
                        Debug.Assert(this._reader.ValueAsString == DxfFileToken.TableEntry);

                        //Read the table name
                        this._reader.ReadNext();

                        int nentries = 0;
                        CadTemplate template = null;
                        Dictionary<string, List<ExtendedDataRecord>> edata = new();

                        this.readCommonObjectData(out string name, out ulong handle, out ulong? ownerHandle, out ulong? xdictHandle, out HashSet<ulong> reactors);

                        if (this._reader.DxfCode == DxfCode.Subclass)
                        {
                                while (this._reader.DxfCode != DxfCode.Start)
                                {
                                        switch (this._reader.Code)
                                        {
                                                //Maximum number of entries in table
                                                case 70:
                                                        nentries = this._reader.ValueAsInt;
                                                        break;
                                                case 100 when this._reader.ValueAsString == DxfSubclassMarker.DimensionStyleTable:
                                                        while (this._reader.DxfCode != DxfCode.Start)
                                                        {
                                                                //template.CadObject has the code 71 for the count of entries
                                                                //Also has 340 codes for each entry with the handles
                                                                this._reader.ReadNext();
                                                        }
                                                        break;
                                                case 100:
                                                        Debug.Assert(this._reader.ValueAsString == DxfSubclassMarker.Table);
                                                        break;
                                                case 1001:
                                                        this.readExtendedData(edata);
                                                        break;
                                                default:
                                                        this._builder.Notify($"[AcDbSymbolTable] Unhandeled dxf code {this._reader.Code} at line {this._reader.Position}.");
                                                        break;
                                        }

                                        if (this._reader.DxfCode == DxfCode.Start)
                                                break;

                                        this._reader.ReadNext();
                                }
                        }
                        else if (this._reader.ValueAsString == DxfFileToken.EndTable)
                        {
                                return;
                        }
                        else
                        {
                                this._reader.ReadNext();
                        }

                        switch (name)
                        {
                                case DxfFileToken.TableAppId:
                                        template = new CadTableTemplate<AppId>(new AppIdsTable());
                                        this.readEntries((CadTableTemplate<AppId>)template);
                                        template.CadObject.Handle = handle;
                                        this._builder.AppIds = (AppIdsTable)template.CadObject;
                                        break;
                                case DxfFileToken.TableBlockRecord:
                                        template = new CadBlockCtrlObjectTemplate(new BlockRecordsTable());
                                        this.readEntries((CadBlockCtrlObjectTemplate)template);
                                        template.CadObject.Handle = handle;
                                        this._builder.BlockRecords = (BlockRecordsTable)template.CadObject;
                                        break;
                                case DxfFileToken.TableVport:
                                        template = new CadTableTemplate<VPort>(new VPortsTable());
                                        this.readEntries((CadTableTemplate<VPort>)template);
                                        template.CadObject.Handle = handle;
                                        this._builder.VPorts = (VPortsTable)template.CadObject;
                                        break;
                                case DxfFileToken.TableLinetype:
                                        template = new CadTableTemplate<LineType>(new LineTypesTable());
                                        this.readEntries((CadTableTemplate<LineType>)template);
                                        template.CadObject.Handle = handle;
                                        this._builder.LineTypesTable = (LineTypesTable)template.CadObject;
                                        break;
                                case DxfFileToken.TableLayer:
                                        template = new CadTableTemplate<Layer>(new LayersTable());
                                        this.readEntries((CadTableTemplate<Layer>)template);
                                        template.CadObject.Handle = handle;
                                        this._builder.Layers = (LayersTable)template.CadObject;
                                        break;
                                case DxfFileToken.TableStyle:
                                        template = new CadTableTemplate<TextStyle>(new TextStylesTable());
                                        this.readEntries((CadTableTemplate<TextStyle>)template);
                                        template.CadObject.Handle = handle;
                                        this._builder.TextStyles = (TextStylesTable)template.CadObject;
                                        break;
                                case DxfFileToken.TableView:
                                        template = new CadTableTemplate<View>(new ViewsTable());
                                        this.readEntries((CadTableTemplate<View>)template);
                                        template.CadObject.Handle = handle;
                                        this._builder.Views = (ViewsTable)template.CadObject;
                                        break;
                                case DxfFileToken.TableUcs:
                                        template = new CadTableTemplate<UCS>(new UCSTable());
                                        this.readEntries((CadTableTemplate<UCS>)template);
                                        template.CadObject.Handle = handle;
                                        this._builder.UCSs = (UCSTable)template.CadObject;
                                        break;
                                case DxfFileToken.TableDimstyle:
                                        template = new CadTableTemplate<DimensionStyle>(new DimensionStylesTable());
                                        this.readEntries((CadTableTemplate<DimensionStyle>)template);
                                        template.CadObject.Handle = handle;
                                        this._builder.DimensionStyles = (DimensionStylesTable)template.CadObject;
                                        break;
                                default:
                                        throw new DxfException($"Unknown table name {name}");
                        }

                        Debug.Assert(ownerHandle == null || ownerHandle.Value == 0);

                        template.OwnerHandle = ownerHandle;
                        template.XDictHandle = xdictHandle;
                        template.ReactorsHandles = reactors;
                        template.EDataTemplateByAppName = edata;

                        //Add the object and the template to the builder
                        this._builder.AddTemplate(template);
                }

                private void readEntries<T>(CadTableTemplate<T> tableTemplate)
                        where T : TableEntry
                {
                        //Read all the entries until the end of the table
                        while (this._reader.ValueAsString != DxfFileToken.EndTable)
                        {
                                this._reader.ReadNext();

                                ICadTableEntryTemplate template = null;

                                //Get the entry
                                switch (tableTemplate.CadObject.ObjectName)
                                {
                                        case DxfFileToken.TableAppId:
                                                template = this.readTableEntry(new CadTableEntryTemplate<AppId>(new AppId()), this.readAppId);
                                                break;
                                        case DxfFileToken.TableBlockRecord:
                                                CadBlockRecordTemplate block = new CadBlockRecordTemplate();
                                                template = this.readTableEntry(block, this.readBlockRecord);

                                                if (block.CadObject.Name.Equals(BlockRecord.ModelSpaceName, StringComparison.OrdinalIgnoreCase))
                                                {
                                                        this._builder.ModelSpaceTemplate = block;
                                                }

                                                break;
                                        case DxfFileToken.TableDimstyle:
                                                template = this.readTableEntry(new CadDimensionStyleTemplate(), this.readDimensionStyle);
                                                break;
                                        case DxfFileToken.TableLayer:
                                                template = this.readTableEntry(new CadLayerTemplate(), this.readLayer);
                                                break;
                                        case DxfFileToken.TableLinetype:
                                                template = this.readTableEntry(new CadLineTypeTemplate(), this.readLineType);
                                                break;
                                        case DxfFileToken.TableStyle:
                                                template = this.readTableEntry(new CadTableEntryTemplate<TextStyle>(new TextStyle()), this.readTextStyle);
                                                break;
                                        case DxfFileToken.TableUcs:
                                                template = this.readTableEntry(new CadUcsTemplate(), this.readUcs);
                                                break;
                                        case DxfFileToken.TableView:
                                                template = this.readTableEntry(new CadViewTemplate(), this.readView);
                                                break;
                                        case DxfFileToken.TableVport:
                                                template = this.readTableEntry(new CadVPortTemplate(), this.readVPort);
                                                break;
                                        default:
                                                Debug.Fail($"Unhandeled table {tableTemplate.CadObject.ObjectName}.");
                                                break;
                                }


                                if (tableTemplate.CadObject.Contains(template.Name) && this._builder.Configuration.Failsafe)
                                {
                                        this._builder.Notify($"Duplicated entry with name {template.Name} found in {template.CadObject.ObjectName}", NotificationType.Warning);

                                        tableTemplate.CadObject.Remove(template.Name);
                                        tableTemplate.CadObject.Add((T)template.CadObject);
                                }
                                else
                                {
                                        tableTemplate.CadObject.Add((T)template.CadObject);
                                }

                                //Add the object and the template to the builder
                                this._builder.AddTemplate(template);
                        }
                }

                private ICadTableEntryTemplate readTableEntry<T>(CadTableEntryTemplate<T> template, ReadEntryDelegate<T> readEntry)
                        where T : TableEntry
                {
                        DxfMap map = DxfMap.Create<T>();

                        while (this._reader.DxfCode != DxfCode.Start)
                        {
                                if (!readEntry(template, map.SubClasses[template.CadObject.SubclassMarker]))
                                {
                                        this.readCommonTableEntryCodes(template, out bool isExtendedData, map);
                                        if (isExtendedData)
                                                continue;
                                }

                                if (this._reader.DxfCode != DxfCode.Start)
                                        this._reader.ReadNext();
                        }

                        return template;
                }

                private void readCommonTableEntryCodes<T>(CadTableEntryTemplate<T> template, out bool isExtendedData, DxfMap map = null)
                        where T : TableEntry
                {
                        isExtendedData = false;
                        switch (this._reader.Code)
                        {
                                case 2:
                                        template.CadObject.Name = this._reader.ValueAsString;
                                        break;
                                case 70:
                                        template.CadObject.Flags = (StandardFlags)this._reader.ValueAsUShort;
                                        break;
                                case 100:
                                        Debug.Assert(map.SubClasses.ContainsKey(this._reader.ValueAsString));
                                        break;
                                default:
                                        this.readCommonCodes(template, out isExtendedData, map);
                                        break;
                        }
                }

                private bool readAppId(CadTableEntryTemplate<AppId> template, DxfClassMap map)
                {
                        Debug.Assert(map.Name == DxfSubclassMarker.ApplicationId);

                        switch (this._reader.Code)
                        {
                                default:
                                        return this.tryAssignCurrentValue(template.CadObject, map);
                        }
                }

                private bool readBlockRecord(CadTableEntryTemplate<BlockRecord> template, DxfClassMap map)
                {
                        CadBlockRecordTemplate tmp = (CadBlockRecordTemplate)template;

                        switch (this._reader.Code)
                        {
                                case 340:
                                        tmp.LayoutHandle = this._reader.ValueAsHandle;
                                        return true;
                                default:
                                        return this.tryAssignCurrentValue(template.CadObject, map);
                        }
                }

                private bool readDimensionStyle(CadTableEntryTemplate<DimensionStyle> template, DxfClassMap map)
                {
                        Debug.Assert(map.Name == DxfSubclassMarker.DimensionStyle);

                        CadDimensionStyleTemplate tmp = (CadDimensionStyleTemplate)template;

                        switch (this._reader.Code)
                        {
                                case 3:
                                        template.CadObject.PostFix = this._reader.ValueAsString;
                                        return true;
                                case 4:
                                        template.CadObject.AlternateDimensioningSuffix = this._reader.ValueAsString;
                                        return true;
                                case 5:
                                        //5        DIMBLK(obsolete, now object ID)
                                        tmp.DIMBL_Name = this._reader.ValueAsString;
                                        return true;
                                case 6:
                                        //6        DIMBLK1(obsolete, now object ID)
                                        tmp.DIMBLK1_Name = this._reader.ValueAsString;
                                        return true;
                                case 7:
                                        //7        DIMBLK2(obsolete, now object ID)
                                        tmp.DIMBLK2_Name = this._reader.ValueAsString;
                                        return true;
                                case 40:
                                        //Somethimes is 0 but it shouldn't be allowed
                                        template.CadObject.ScaleFactor = this._reader.ValueAsDouble <= 0 ? 1.0d : this._reader.ValueAsDouble;
                                        return true;
                                case 41:
                                        template.CadObject.ArrowSize = this._reader.ValueAsDouble;
                                        return true;
                                case 42:
                                        template.CadObject.ExtensionLineOffset = this._reader.ValueAsDouble;
                                        return true;
                                case 43:
                                        template.CadObject.DimensionLineIncrement = this._reader.ValueAsDouble;
                                        return true;
                                case 44:
                                        template.CadObject.ExtensionLineExtension = this._reader.ValueAsDouble;
                                        return true;
                                case 45:
                                        template.CadObject.Rounding = this._reader.ValueAsDouble;
                                        return true;
                                case 46:
                                        template.CadObject.DimensionLineExtension = this._reader.ValueAsDouble;
                                        return true;
                                case 47:
                                        template.CadObject.PlusTolerance = this._reader.ValueAsDouble;
                                        return true;
                                case 48:
                                        template.CadObject.MinusTolerance = this._reader.ValueAsDouble;
                                        return true;
                                case 49:
                                        template.CadObject.FixedExtensionLineLength = this._reader.ValueAsDouble;
                                        return true;
                                case 50:
                                        template.CadObject.JoggedRadiusDimensionTransverseSegmentAngle = CSMath.MathHelper.DegToRad(this._reader.ValueAsDouble);
                                        return true;
                                case 69:
                                        template.CadObject.TextBackgroundFillMode = (DimensionTextBackgroundFillMode)this._reader.ValueAsShort;
                                        return true;
                                case 70:
                                        if (!tmp.DxfFlagsAssigned)
                                        {
                                                tmp.DxfFlagsAssigned = true;
                                                return true;
                                        }
                                        else if (this._reader.ValueAsShort >= 0)
                                        {
                                                template.CadObject.TextBackgroundColor = new Color(this._reader.ValueAsShort);
                                        }
                                        return true;
                                case 71:
                                        template.CadObject.GenerateTolerances = this._reader.ValueAsBool;
                                        return true;
                                case 72:
                                        template.CadObject.LimitsGeneration = this._reader.ValueAsBool;
                                        return true;
                                case 73:
                                        template.CadObject.TextInsideHorizontal = this._reader.ValueAsBool;
                                        return true;
                                case 74:
                                        template.CadObject.TextOutsideHorizontal = this._reader.ValueAsBool;
                                        return true;
                                case 75:
                                        template.CadObject.SuppressFirstExtensionLine = this._reader.ValueAsBool;
                                        return true;
                                case 76:
                                        template.CadObject.SuppressSecondExtensionLine = this._reader.ValueAsBool;
                                        return true;
                                case 77:
                                        template.CadObject.TextVerticalAlignment = (DimensionTextVerticalAlignment)this._reader.ValueAsShort;
                                        return true;
                                case 78:
                                        template.CadObject.ZeroHandling = (ZeroHandling)this._reader.ValueAsShort;
                                        return true;
                                case 79:
                                        template.CadObject.AngularZeroHandling = (ZeroHandling)this._reader.ValueAsShort;
                                        return true;
                                case 90:
                                        template.CadObject.ArcLengthSymbolPosition = (ArcLengthSymbolPosition)(int)this._reader.ValueAsShort;
                                        return true;
                                case 105:
                                        template.CadObject.Handle = this._reader.ValueAsHandle;
                                        return true;
                                case 140:
                                        template.CadObject.TextHeight = this._reader.ValueAsDouble;
                                        return true;
                                case 141:
                                        template.CadObject.CenterMarkSize = this._reader.ValueAsDouble;
                                        return true;
                                case 142:
                                        template.CadObject.TickSize = this._reader.ValueAsDouble;
                                        return true;
                                case 143:
                                        template.CadObject.AlternateUnitScaleFactor = this._reader.ValueAsDouble;
                                        return true;
                                case 144:
                                        template.CadObject.LinearScaleFactor = this._reader.ValueAsDouble;
                                        return true;
                                case 145:
                                        template.CadObject.TextVerticalPosition = this._reader.ValueAsDouble;
                                        return true;
                                case 146:
                                        template.CadObject.ToleranceScaleFactor = this._reader.ValueAsDouble;
                                        return true;
                                case 147:
                                        template.CadObject.DimensionLineGap = this._reader.ValueAsDouble;
                                        return true;
                                case 148:
                                        template.CadObject.AlternateUnitRounding = this._reader.ValueAsDouble;
                                        return true;
                                case 170:
                                        template.CadObject.AlternateUnitDimensioning = this._reader.ValueAsBool;
                                        return true;
                                case 171:
                                        template.CadObject.AlternateUnitDecimalPlaces = this._reader.ValueAsShort;
                                        return true;
                                case 172:
                                        template.CadObject.TextOutsideExtensions = this._reader.ValueAsBool;
                                        return true;
                                case 173:
                                        template.CadObject.SeparateArrowBlocks = this._reader.ValueAsBool;
                                        return true;
                                case 174:
                                        template.CadObject.TextInsideExtensions = this._reader.ValueAsBool;
                                        return true;
                                case 175:
                                        template.CadObject.SuppressOutsideExtensions = this._reader.ValueAsBool;
                                        return true;
                                case 176:
                                        template.CadObject.DimensionLineColor = new Color(this._reader.ValueAsShort);
                                        return true;
                                case 177:
                                        template.CadObject.ExtensionLineColor = new Color(this._reader.ValueAsShort);
                                        return true;
                                case 178:
                                        template.CadObject.TextColor = new Color(this._reader.ValueAsShort);
                                        return true;
                                case 179:
                                        template.CadObject.AngularDecimalPlaces = this._reader.ValueAsShort;
                                        return true;
                                case 270:
                                        template.CadObject.LinearUnitFormat = (LinearUnitFormat)this._reader.ValueAsShort;
                                        return true;
                                case 271:
                                        template.CadObject.DecimalPlaces = this._reader.ValueAsShort;
                                        return true;
                                case 272:
                                        template.CadObject.ToleranceDecimalPlaces = this._reader.ValueAsShort;
                                        return true;
                                case 273:
                                        template.CadObject.AlternateUnitFormat = (LinearUnitFormat)this._reader.ValueAsShort;
                                        return true;
                                case 274:
                                        template.CadObject.AlternateUnitToleranceDecimalPlaces = this._reader.ValueAsShort;
                                        return true;
                                case 275:
                                        template.CadObject.AngularUnit = (AngularUnitFormat)this._reader.ValueAsShort;
                                        return true;
                                case 276:
                                        template.CadObject.FractionFormat = (FractionFormat)this._reader.ValueAsShort;
                                        return true;
                                case 277:
                                        template.CadObject.LinearUnitFormat = (LinearUnitFormat)this._reader.ValueAsShort;
                                        return true;
                                case 278:
                                        template.CadObject.DecimalSeparator = (char)this._reader.ValueAsShort;
                                        return true;
                                case 279:
                                        template.CadObject.TextMovement = (TextMovement)this._reader.ValueAsShort;
                                        return true;
                                case 280:
                                        template.CadObject.TextHorizontalAlignment = (DimensionTextHorizontalAlignment)this._reader.ValueAsShort;
                                        return true;
                                case 281:
                                        template.CadObject.SuppressFirstDimensionLine = this._reader.ValueAsBool;
                                        return true;
                                case 282:
                                        template.CadObject.SuppressSecondDimensionLine = this._reader.ValueAsBool;
                                        return true;
                                case 283:
                                        template.CadObject.ToleranceAlignment = (ToleranceAlignment)this._reader.ValueAsShort;
                                        return true;
                                case 284:
                                        template.CadObject.ToleranceZeroHandling = (ZeroHandling)this._reader.ValueAsShort;
                                        return true;
                                case 285:
                                        template.CadObject.AlternateUnitZeroHandling = (ZeroHandling)this._reader.ValueAsShort;
                                        return true;
                                case 286:
                                        template.CadObject.AlternateUnitToleranceZeroHandling = (ZeroHandling)(byte)this._reader.ValueAsShort;
                                        return true;
                                case 287:
                                        template.CadObject.DimensionFit = this._reader.ValueAsShort;
                                        return true;
                                case 288:
                                        template.CadObject.CursorUpdate = this._reader.ValueAsBool;
                                        return true;
                                case 289:
                                        template.CadObject.DimensionTextArrowFit = (TextArrowFitType)this._reader.ValueAsShort;
                                        return true;
                                case 290:
                                        template.CadObject.IsExtensionLineLengthFixed = this._reader.ValueAsBool;
                                        return true;
                                case 340:
                                        tmp.TextStyleHandle = this._reader.ValueAsHandle;
                                        return true;
                                case 341:
                                        tmp.DIMLDRBLK = this._reader.ValueAsHandle;
                                        return true;
                                case 342:
                                        tmp.DIMBLK = this._reader.ValueAsHandle;
                                        return true;
                                case 343:
                                        tmp.DIMBLK1 = this._reader.ValueAsHandle;
                                        return true;
                                case 344:
                                        tmp.DIMBLK2 = this._reader.ValueAsHandle;
                                        return true;
                                case 345:
                                        tmp.Dimltype = this._reader.ValueAsHandle;
                                        return true;
                                case 346:
                                        tmp.Dimltex1 = this._reader.ValueAsHandle;
                                        return true;
                                case 347:
                                        tmp.Dimltex2 = this._reader.ValueAsHandle;
                                        return true;
                                case 371:
                                        template.CadObject.DimensionLineWeight = (LineWeightType)this._reader.ValueAsShort;
                                        return true;
                                case 372:
                                        template.CadObject.ExtensionLineWeight = (LineWeightType)this._reader.ValueAsShort;
                                        return true;
                                default:
                                        return false;
                        }
                }

                private bool readLayer(CadTableEntryTemplate<Layer> template, DxfClassMap map)
                {
                        Debug.Assert(map.Name == DxfSubclassMarker.Layer);

                        CadLayerTemplate tmp = (CadLayerTemplate)template;

                        switch (this._reader.Code)
                        {
                                case 6:
                                        tmp.LineTypeName = this._reader.ValueAsString;
                                        return true;
                                case 62:
                                        short index = this._reader.ValueAsShort;
                                        if (index < 0)
                                        {
                                                template.CadObject.IsOn = false;
                                                index = Math.Abs(index);
                                        }

                                        var color = new Color(index);
                                        if (color.IsByBlock || color.IsByLayer)
                                        {
                                                this._builder.Notify($"Wrong index {index} for layer {template.CadObject.Name}", NotificationType.Warning);
                                        }
                                        else
                                        {
                                                template.CadObject.Color = new Color(index);
                                        }
                                        return true;
                                case 347:
                                        tmp.MaterialHandle = this._reader.ValueAsHandle;
                                        return true;
                                case 348:
                                        //Unknown code value, always 0
                                        return true;
                                case 390:
                                        template.CadObject.PlotStyleName = this._reader.ValueAsHandle;
                                        return true;
                                case 430:
                                        tmp.TrueColorName = this._reader.ValueAsString;
                                        return true;
                                default:
                                        return this.tryAssignCurrentValue(template.CadObject, map);
                        }
                }

                private bool readLineType(CadTableEntryTemplate<LineType> template, DxfClassMap map)
                {
                        Debug.Assert(map.Name == DxfSubclassMarker.Linetype);

                        CadLineTypeTemplate tmp = (CadLineTypeTemplate)template;

                        switch (this._reader.Code)
                        {
                                case 40:
                                        tmp.TotalLen = this._reader.ValueAsDouble;
                                        return true;
                                case 49:
                                        do
                                        {
                                                tmp.SegmentTemplates.Add(this.readLineTypeSegment());
                                        }
                                        while (this._reader.Code == 49);
                                        return true;
                                case 73:
                                        //number of segments
                                        return true;
                                default:
                                        return this.tryAssignCurrentValue(template.CadObject, map);
                        }
                }

                private SegmentTemplate readLineTypeSegment()
                {
                        SegmentTemplate template = new SegmentTemplate();
                        template.Segment.Length = this._reader.ValueAsDouble;

                        //Jump the 49 code
                        this._reader.ReadNext();

                        while (this._reader.Code != 49 && this._reader.Code != 0)
                        {
                                switch (this._reader.Code)
                                {
                                        case 9:
                                                template.Segment.Text = this._reader.ValueAsString;
                                                break;
                                        case 44:
                                                template.Segment.Offset = new CSMath.XY(this._reader.ValueAsDouble, template.Segment.Offset.Y);
                                                break;
                                        case 45:
                                                template.Segment.Offset = new CSMath.XY(template.Segment.Offset.X, this._reader.ValueAsDouble);
                                                break;
                                        case 46:
                                                template.Segment.Scale = this._reader.ValueAsDouble;
                                                break;
                                        case 50:
                                                template.Segment.Rotation = this._reader.ValueAsAngle;
                                                break;
                                        case 74:
                                                template.Segment.Flags = (LineTypeShapeFlags)this._reader.ValueAsUShort;
                                                break;
                                        case 75:
                                                template.Segment.ShapeNumber = (short)this._reader.ValueAsInt;
                                                break;
                                        case 340:
                                                break;
                                        default:
                                                this._builder.Notify($"[LineTypeSegment] Unhandeled dxf code {this._reader.Code} with value {this._reader.ValueAsString}, positon {this._reader.Position}", NotificationType.None);
                                                break;
                                }

                                this._reader.ReadNext();
                        }

                        return template;
                }

                private bool readTextStyle(CadTableEntryTemplate<TextStyle> template, DxfClassMap map)
                {
                        Debug.Assert(map.Name == DxfSubclassMarker.TextStyle);

                        switch (this._reader.Code)
                        {
                                case 2:
                                        if (!this._reader.ValueAsString.IsNullOrEmpty())
                                        {
                                                //In some files the TextStyle is an empty string
                                                template.CadObject.Name = this._reader.ValueAsString;
                                        }
                                        return true;
                                default:
                                        return this.tryAssignCurrentValue(template.CadObject, map);
                        }
                }

                private bool readUcs(CadTableEntryTemplate<UCS> template, DxfClassMap map)
                {
                        Debug.Assert(map.Name == DxfSubclassMarker.Ucs);

                        switch (this._reader.Code)
                        {
                                default:
                                        return this.tryAssignCurrentValue(template.CadObject, map);
                        }
                }

                private bool readView(CadTableEntryTemplate<View> template, DxfClassMap map)
                {
                        Debug.Assert(map.Name == DxfSubclassMarker.View);

                        CadViewTemplate tmp = template as CadViewTemplate;

                        switch (this._reader.Code)
                        {
                                case 348:
                                        tmp.VisualStyleHandle = this._reader.ValueAsHandle;
                                        return true;
                                default:
                                        return this.tryAssignCurrentValue(template.CadObject, map);
                        }
                }

                private bool readVPort(CadTableEntryTemplate<VPort> template, DxfClassMap map)
                {
                        Debug.Assert(map.Name == DxfSubclassMarker.VPort);

                        CadVPortTemplate tmp = template as CadVPortTemplate;

                        switch (this._reader.Code)
                        {
                                //NOTE: Undocumented codes
                                case 65:
                                case 73:
                                        return true;
                                case 348:
                                        tmp.StyleHandle = this._reader.ValueAsHandle;
                                        return true;
                                default:
                                        return this.tryAssignCurrentValue(template.CadObject, map);
                        }
                }
        }
}

DomCR / ACadSharp / 17737836230

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