private async Task <SyntaxNode> GetDefaultExpression(ITypeSymbol type, MappingContext mappingContext, MappingPath mappingPath)
{
if (mappingPath.AddToMapped(type) == false)
{
return(syntaxGenerator.DefaultExpression(type)
.WithTrailingTrivia(SyntaxFactory.Comment(" /* Stop recursive mapping */")));
}
if (SymbolHelper.IsNullable(type, out var underlyingType))
{
type = underlyingType;
}
if (type.TypeKind == TypeKind.Enum && type is INamedTypeSymbol namedTypeSymbol)
{
var enumOption = namedTypeSymbol.MemberNames.Where(x => x != "value__" && x != ".ctor").OrderBy(x => x).FirstOrDefault();
if (enumOption != null)
{
return(SyntaxFactoryExtensions.CreateMemberAccessExpression(SyntaxFactory.IdentifierName(namedTypeSymbol.Name), false, enumOption));
}
return(syntaxGenerator.DefaultExpression(type));
}
if (type.SpecialType == SpecialType.None)
{
ObjectCreationExpressionSyntax objectCreationExpression = null;
if (MappingHelper.IsCollection(type))
{
var isReadonlyCollection = ObjectHelper.IsReadonlyCollection(type);
if (type is IArrayTypeSymbol)
{
objectCreationExpression = CreateObject(type);
}
else if (type.TypeKind == TypeKind.Interface || isReadonlyCollection)
{
if (type is INamedTypeSymbol namedType && namedType.IsGenericType)
{
var typeArgumentListSyntax = SyntaxFactory.TypeArgumentList(SyntaxFactory.SeparatedList(namedType.TypeArguments.Select(x => syntaxGenerator.TypeExpression(x))));
var newType = SyntaxFactory.GenericName(SyntaxFactory.Identifier("List"), typeArgumentListSyntax);
objectCreationExpression = SyntaxFactory.ObjectCreationExpression(newType, SyntaxFactory.ArgumentList(), default(InitializerExpressionSyntax));
}
else
{
var newType = SyntaxFactory.ParseTypeName("ArrayList");
objectCreationExpression = SyntaxFactory.ObjectCreationExpression(newType, SyntaxFactory.ArgumentList(), default(InitializerExpressionSyntax));
}
}
objectCreationExpression ??= CreateObject(type, Array.Empty <ArgumentSyntax>());
var subType = MappingHelper.GetElementType(type);
var initializationBlockExpressions = new SeparatedSyntaxList <ExpressionSyntax>();
var subTypeDefault = (ExpressionSyntax)(await GetDefaultExpression(subType.Type, mappingContext, mappingPath.Clone()).ConfigureAwait(false));
if (subTypeDefault != null)
{
initializationBlockExpressions = initializationBlockExpressions.Add(subTypeDefault);
}
var initializerExpressionSyntax = SyntaxFactory.InitializerExpression(SyntaxKind.ObjectInitializerExpression, initializationBlockExpressions).FixInitializerExpressionFormatting(objectCreationExpression);
return(objectCreationExpression
.WithInitializer(initializerExpressionSyntax)
.WrapInReadonlyCollectionIfNecessary(isReadonlyCollection, syntaxGenerator));
}
{
var nt = type as INamedTypeSymbol;
if (nt == null)
{
var genericTypeConstraints = type.UnwrapGeneric().ToList();
if (genericTypeConstraints.Any() == false)
{
return(GetDefaultForUnknown(type, ObjectType));
}
nt = genericTypeConstraints.FirstOrDefault(x => x.TypeKind == TypeKind.Class) as INamedTypeSymbol ??
genericTypeConstraints.FirstOrDefault(x => x.TypeKind == TypeKind.Interface) as INamedTypeSymbol;
}
if (nt == null)
{
return(GetDefaultForUnknownType(type));
}
if (nt.TypeKind == TypeKind.Interface)
{
var implementations = await SymbolFinder.FindImplementationsAsync(type, _document.Project.Solution).ConfigureAwait(false);
var firstImplementation = implementations.FirstOrDefault();
if (firstImplementation is INamedTypeSymbol == false)
{
return(GetDefaultForUnknownType(type));
}
nt = firstImplementation as INamedTypeSymbol;
objectCreationExpression = CreateObject(nt);
}
else if (nt.TypeKind == TypeKind.Class && nt.IsAbstract)
{
var allDerived = await SymbolFinder.FindDerivedClassesAsync(nt, _document.Project.Solution).ConfigureAwait(false);
var randomDerived = allDerived.FirstOrDefault(x => x.IsAbstract == false);
if (randomDerived != null)
{
nt = randomDerived;
objectCreationExpression = CreateObject(nt);
}
}
else
{
var publicConstructors = nt.Constructors.Where(x => mappingContext.AccessibilityHelper.IsSymbolAccessible(x, nt)).ToList();
var hasDefaultConstructor = publicConstructors.Any(x => x.Parameters.Length == 0);
if (hasDefaultConstructor == false && publicConstructors.Count > 0)
{
var randomConstructor = publicConstructors.First();
var constructorArguments = await GetConstructorArguments(mappingContext, mappingPath, randomConstructor).ConfigureAwait(false);
objectCreationExpression = CreateObject(nt, constructorArguments);
}
}
var fields = mappingTargetHelper.GetFieldsThaCanBeSetPublicly(nt, mappingContext);
var assignments = new List <AssignmentExpressionSyntax>(fields.Count);
foreach (var x in fields)
{
var identifier = (ExpressionSyntax)(SyntaxFactory.IdentifierName(x.Name));
var mappingSource = await this.FindMappingSource(x.Type, mappingContext, mappingPath.Clone()).ConfigureAwait(false);
assignments.Add(SyntaxFactory.AssignmentExpression(SyntaxKind.SimpleAssignmentExpression, identifier, mappingSource.Expression));
}
if (objectCreationExpression == null)
{
objectCreationExpression = CreateObject(type);
}
return(SyntaxFactoryExtensions.WithMembersInitialization(objectCreationExpression, assignments));
}
}
internal SyntaxNode GetDefaultExpression(ITypeSymbol type, MappingPath mappingPath)
{
if (mappingPath.AddToMapped(type) == false)
{
return(syntaxGenerator.DefaultExpression(type)
.WithTrailingTrivia(SyntaxFactory.Comment(" /* Stop recursive mapping */")));
}
if (SymbolHelper.IsNullable(type, out var underlyingType))
{
type = underlyingType;
}
if (type.TypeKind == TypeKind.Enum && type is INamedTypeSymbol namedTypeSymbol)
{
var enumOptions = namedTypeSymbol.MemberNames.Where(x => x != "value__" && x != ".ctor").ToList();
if (enumOptions.Count > 0)
{
return(syntaxGenerator.MemberAccessExpression(syntaxGenerator.IdentifierName(namedTypeSymbol.Name), syntaxGenerator.IdentifierName(enumOptions[0])));
}
return(syntaxGenerator.DefaultExpression(type));
}
if (type.SpecialType == SpecialType.None)
{
var objectCreationExpression = (ObjectCreationExpressionSyntax)syntaxGenerator.ObjectCreationExpression(type);
if (MappingHelper.IsCollection(type))
{
var isReadonlyCollection = ObjectHelper.IsReadonlyCollection(type);
if (type is IArrayTypeSymbol)
{
objectCreationExpression = SyntaxFactory.ObjectCreationExpression((TypeSyntax)syntaxGenerator.TypeExpression(type));
}
else if (type.TypeKind == TypeKind.Interface || isReadonlyCollection)
{
var namedType = type as INamedTypeSymbol;
if (namedType.IsGenericType)
{
var typeArgumentListSyntax = SyntaxFactory.TypeArgumentList(SyntaxFactory.SeparatedList(namedType.TypeArguments.Select(x => syntaxGenerator.TypeExpression(x))));
var newType = SyntaxFactory.GenericName(SyntaxFactory.Identifier("List"), typeArgumentListSyntax);
objectCreationExpression = SyntaxFactory.ObjectCreationExpression(newType, SyntaxFactory.ArgumentList(), default(InitializerExpressionSyntax));
}
else
{
var newType = SyntaxFactory.ParseTypeName("ArrayList");
objectCreationExpression = SyntaxFactory.ObjectCreationExpression(newType, SyntaxFactory.ArgumentList(), default(InitializerExpressionSyntax));
}
}
var subType = MappingHelper.GetElementType(type);
var initializationBlockExpressions = new SeparatedSyntaxList <ExpressionSyntax>();
var subTypeDefault = (ExpressionSyntax)GetDefaultExpression(subType, mappingPath.Clone());
if (subTypeDefault != null)
{
initializationBlockExpressions = initializationBlockExpressions.Add(subTypeDefault);
}
var initializerExpressionSyntax = SyntaxFactory.InitializerExpression(SyntaxKind.ObjectInitializerExpression, initializationBlockExpressions).FixInitializerExpressionFormatting(objectCreationExpression);
return(objectCreationExpression
.WithInitializer(initializerExpressionSyntax)
.WrapInReadonlyCollectionIfNecessary(isReadonlyCollection, syntaxGenerator));
}
{
var nt = type as INamedTypeSymbol;
if (nt == null)
{
var genericTypeConstraints = type.UnwrapGeneric().ToList();
if (genericTypeConstraints.Any() == false)
{
return(GetDefaultForUnknown(type, SyntaxFactory.ParseTypeName("object")));
}
nt = genericTypeConstraints.FirstOrDefault(x => x.TypeKind == TypeKind.Class) as INamedTypeSymbol ??
genericTypeConstraints.FirstOrDefault(x => x.TypeKind == TypeKind.Interface) as INamedTypeSymbol;
}
if (nt == null)
{
return(GetDefaultForUnknownType(type));
}
if (nt.TypeKind == TypeKind.Interface)
{
var implementations = SymbolFinder.FindImplementationsAsync(type, this._document.Project.Solution).Result;
var firstImplementation = implementations.FirstOrDefault();
if (firstImplementation is INamedTypeSymbol == false)
{
return(GetDefaultForUnknownType(type));
}
nt = firstImplementation as INamedTypeSymbol;
objectCreationExpression = (ObjectCreationExpressionSyntax)syntaxGenerator.ObjectCreationExpression(nt);
}
else if (nt.TypeKind == TypeKind.Class && nt.IsAbstract)
{
var randomDerived = SymbolFinder.FindDerivedClassesAsync(nt, this._document.Project.Solution).Result
.FirstOrDefault(x => x.IsAbstract == false);
if (randomDerived != null)
{
nt = randomDerived;
objectCreationExpression = (ObjectCreationExpressionSyntax)syntaxGenerator.ObjectCreationExpression(nt);
}
}
var publicConstructors = nt.Constructors.Where(x =>
x.DeclaredAccessibility == Accessibility.Public ||
(x.DeclaredAccessibility == Accessibility.Internal &&
x.ContainingAssembly.IsSameAssemblyOrHasFriendAccessTo(_contextAssembly))).ToList();
var hasDefaultConstructor = publicConstructors.Any(x => x.Parameters.Length == 0);
if (hasDefaultConstructor == false && publicConstructors.Count > 0)
{
var randomConstructor = publicConstructors.First();
var constructorArguments = randomConstructor.Parameters.Select(p => GetDefaultExpression(p.Type, mappingPath.Clone())).ToList();
objectCreationExpression = (ObjectCreationExpressionSyntax)syntaxGenerator.ObjectCreationExpression(nt, constructorArguments);
}
var fields = ObjectHelper.GetFieldsThaCanBeSetPublicly(nt, _contextAssembly);
var assignments = fields.Select(x =>
{
var identifier = (ExpressionSyntax)(SyntaxFactory.IdentifierName(x.Name));
return((ExpressionSyntax)syntaxGenerator.AssignmentStatement(identifier, this.FindMappingSource(x.Type, mappingPath.Clone()).Expression));
}).ToList();
if (assignments.Count == 0)
{
return(objectCreationExpression);
}
var initializerExpressionSyntax = SyntaxFactory.InitializerExpression(SyntaxKind.ObjectInitializerExpression, new SeparatedSyntaxList <ExpressionSyntax>().AddRange(assignments)).FixInitializerExpressionFormatting(objectCreationExpression);
return(objectCreationExpression.WithInitializer(initializerExpressionSyntax));
}
}
return(GetDefaultForSpecialType(type));
}