public static LockFile Read()

in src/NuGet.Core/NuGet.ProjectModel/LockFile/Utf8JsonStreamLockFileConverter.cs [47:212]
153 lines of code
29 McCabe index (conditional complexity)

        public static LockFile Read(ref Utf8JsonStreamReader reader, LockFileReadFlags flags)
        {
            if (reader.TokenType != JsonTokenType.StartObject)
            {
                throw new JsonException("Expected StartObject, found " + reader.TokenType);
            }

            var lockFile = new LockFile();

            while (reader.Read() && reader.TokenType == JsonTokenType.PropertyName)
            {
                if (reader.ValueTextEquals(VersionPropertyName))
                {
                    reader.Read();
                    if (reader.TryGetInt32(out int version))
                    {
                        lockFile.Version = version;
                    }
                    else
                    {
                        lockFile.Version = int.MinValue;
                    }
                }
                else if (reader.ValueTextEquals(LibrariesPropertyName))
                {
                    reader.Read();

                    if ((flags & LockFileReadFlags.Libraries) == LockFileReadFlags.Libraries)
                    {
                        lockFile.Libraries = reader.ReadObjectAsList<LockFileLibrary>(Utf8JsonStreamLockFileConverters.LockFileLibraryConverter);
                    }
                    else
                    {
                        reader.Skip();
                        lockFile.Libraries = Array.Empty<LockFileLibrary>();
                    }
                }
                else if (reader.ValueTextEquals(TargetsPropertyName))
                {
                    reader.Read();

                    if ((flags & LockFileReadFlags.Targets) == LockFileReadFlags.Targets)
                    {
                        lockFile.Targets = reader.ReadObjectAsList<LockFileTarget>(Utf8JsonStreamLockFileConverters.LockFileTargetConverter);
                    }
                    else
                    {
                        reader.Skip();
                        lockFile.Targets = Array.Empty<LockFileTarget>();
                    }
                }
                else if (reader.ValueTextEquals(ProjectFileDependencyGroupsPropertyName))
                {
                    reader.Read();

                    if ((flags & LockFileReadFlags.ProjectFileDependencyGroups) == LockFileReadFlags.ProjectFileDependencyGroups)
                    {
                        lockFile.ProjectFileDependencyGroups = reader.ReadObjectAsList<ProjectFileDependencyGroup>(Utf8JsonStreamLockFileConverters.ProjectFileDepencencyGroupConverter);
                    }
                    else
                    {
                        reader.Skip();
                        lockFile.ProjectFileDependencyGroups = Array.Empty<ProjectFileDependencyGroup>();
                    }
                }
                else if (reader.ValueTextEquals(PackageFoldersPropertyName))
                {
                    reader.Read();

                    if ((flags & LockFileReadFlags.PackageFolders) == LockFileReadFlags.PackageFolders)
                    {
                        lockFile.PackageFolders = reader.ReadObjectAsList<LockFileItem>(Utf8JsonStreamLockFileConverters.LockFileItemConverter);
                    }
                    else
                    {
                        reader.Skip();
                        lockFile.PackageFolders = Array.Empty<LockFileItem>();
                    }
                }
                else if (reader.ValueTextEquals(ProjectPropertyName))
                {
                    reader.Read();

                    if ((flags & LockFileReadFlags.PackageSpec) == LockFileReadFlags.PackageSpec)
                    {
                        lockFile.PackageSpec = JsonPackageSpecReader.GetPackageSpec(
                            ref reader,
                            name: null,
                            packageSpecPath: null,
                            EnvironmentVariableWrapper.Instance,
                            snapshotValue: null);
                    }
                    else
                    {
                        reader.Skip();
                        lockFile.PackageSpec = new PackageSpec(Array.Empty<TargetFrameworkInformation>());
                    }
                }
                else if (reader.ValueTextEquals(CentralTransitiveDependencyGroupsPropertyName))
                {
                    IList<CentralTransitiveDependencyGroup> results = null;
                    if ((flags & LockFileReadFlags.CentralTransitiveDependencyGroups) == LockFileReadFlags.CentralTransitiveDependencyGroups)
                    {
                        if (reader.Read() && reader.TokenType == JsonTokenType.StartObject)
                        {
                            while (reader.Read() && reader.TokenType == JsonTokenType.PropertyName)
                            {
                                results ??= new List<CentralTransitiveDependencyGroup>();
                                var frameworkPropertyName = reader.GetString();
                                NuGetFramework framework = NuGetFramework.Parse(frameworkPropertyName);

                                JsonPackageSpecReader.ReadCentralTransitiveDependencyGroup(
                                    jsonReader: ref reader,
                                    results: out var dependencies,
                                    packageSpecPath: string.Empty);
                                results.Add(new CentralTransitiveDependencyGroup(framework, dependencies));
                            }
                        }
                    }
                    else
                    {
                        reader.Skip();
                    }

                    lockFile.CentralTransitiveDependencyGroups = results ?? Array.Empty<CentralTransitiveDependencyGroup>();
                }
                else if (reader.ValueTextEquals(LogsPropertyName))
                {
                    reader.Read();
                    if ((flags & LockFileReadFlags.LogMessages) == LockFileReadFlags.LogMessages)
                    {
                        lockFile.LogMessages = reader.ReadListOfObjects<IAssetsLogMessage>(Utf8JsonStreamLockFileConverters.IAssetsLogMessageConverter);
                    }
                    else
                    {
                        reader.Skip();
                        lockFile.LogMessages = Array.Empty<IAssetsLogMessage>();
                    }
                }
                else
                {
                    reader.Skip();
                }
            }

            if (lockFile.Version == 3)
            {
                // Populate the alias at read time. This allows readers to use the alias to find targets regardless of what the underlying assets file format is.
                foreach (var target in lockFile.Targets)
                {
                    target.TargetAlias = lockFile.PackageSpec?.GetRestoreMetadataFramework(target.TargetFramework)?.TargetAlias;
                }
            }

            var projectPath = lockFile.PackageSpec?.RestoreMetadata?.ProjectPath;
            if (!string.IsNullOrEmpty(projectPath) && lockFile.LogMessages.Count > 0)
            {
                foreach (AssetsLogMessage message in lockFile.LogMessages.Where(x => string.IsNullOrEmpty(x.ProjectPath)))
                {
                    message.ProjectPath = projectPath;
                    message.FilePath = projectPath;
                }
            }

            return lockFile;
        }