private MappingElement FindSubPropertySource(string targetName, ITypeSymbol containingType, IEnumerable <IObjectField> properties, SyntaxNode currentAccessor, MappingContext mappingContext, bool isCurrentAccessorNullable, string prefix = null)
{
if (ObjectHelper.IsSimpleType(containingType))
{
return(null);
}
var subProperty = properties.Where(x => targetName.StartsWith($"{prefix}{x.Name}", StringComparison.OrdinalIgnoreCase))
.FirstOrDefault(p => p.CanBeGet(containingType, mappingContext));
if (subProperty != null)
{
var currentNamePart = $"{prefix}{subProperty.Name}";
var subPropertyAccessor = SyntaxFactoryExtensions.CreateMemberAccessExpression((ExpressionSyntax)currentAccessor, isCurrentAccessorNullable, subProperty.Name);
var expressionCanBeNull = isCurrentAccessorNullable || subProperty.Type.CanBeNull;
if (targetName.Equals(currentNamePart, StringComparison.OrdinalIgnoreCase))
{
return(new MappingElement
{
Expression = subPropertyAccessor,
ExpressionType = new AnnotatedType(subProperty.Type.Type, expressionCanBeNull)
});
}
return(FindSubPropertySource(targetName, subProperty.Type.Type, subProperty.Type.Type.GetObjectFields(), subPropertyAccessor, mappingContext, expressionCanBeNull, currentNamePart));
}
return(null);
}
private MappingElement TryFindSource(string targetName, MappingContext mappingContext, AnnotatedType accessedVia)
{
//Direct 1-1 mapping
var matchedSourceProperty = sourceProperties.Value
.Where(x => x.Name.Equals(targetName, StringComparison.OrdinalIgnoreCase) || $"{potentialPrefix}{x.Name}".Equals(targetName, StringComparison.OrdinalIgnoreCase))
.FirstOrDefault(p => p.CanBeGet(accessedVia.Type, mappingContext));
if (matchedSourceProperty != null)
{
return(new MappingElement()
{
Expression = SyntaxFactoryExtensions.CreateMemberAccessExpression((ExpressionSyntax)sourceGlobalAccessor, accessedVia.CanBeNull, matchedSourceProperty.Name),
ExpressionType = new AnnotatedType(matchedSourceProperty.Type.Type, accessedVia.CanBeNull || matchedSourceProperty.Type.CanBeNull)
});
}
//Non-direct (mapping like y.UserName = x.User.Name)
var source = FindSubPropertySource(targetName, sourceType.Type, sourceProperties.Value, sourceGlobalAccessor, mappingContext, accessedVia.CanBeNull);
if (source != null)
{
return(source);
}
//Flattening with function eg. t.Total = s.GetTotal()
var matchedSourceMethod = sourceMethods.Value.Where((x => x.Name.EndsWith(targetName, StringComparison.OrdinalIgnoreCase))).FirstOrDefault(m => mappingContext.AccessibilityHelper.IsSymbolAccessible(m, accessedVia.Type));
if (matchedSourceMethod != null)
{
var sourceMethodAccessor = SyntaxFactoryExtensions.CreateMethodAccessExpression((ExpressionSyntax)sourceGlobalAccessor, sourceType.CanBeNull, matchedSourceMethod.Name);
return(new MappingElement()
{
Expression = sourceMethodAccessor,
ExpressionType = new AnnotatedType(matchedSourceMethod.ReturnType, sourceType.CanBeNull || matchedSourceMethod.CanBeNull())
});
}
// HIGHLY SPECULATIVE: Expanding acronyms: UserName = u.Name
if (string.IsNullOrWhiteSpace(potentialPrefix) == false && potentialPrefix == potentialPrefix.ToLowerInvariant() && targetName != potentialPrefix)
{
var acronym = GetAcronym(targetName).ToLowerInvariant();
if (acronym.StartsWith(potentialPrefix))
{
var rest = acronymPattern.Split(targetName).Skip(potentialPrefix.Length);
var newTarget = $"{potentialPrefix}{string.Join("", rest)}";
return(TryFindSource(newTarget, mappingContext, accessedVia));
}
}
return(null);
}
private SyntaxNode GetDefaultExpression(ITypeSymbol type, MappingContext mappingContext, MappingPath mappingPath)
{
if (mappingPath.AddToMapped(type) == false)
{
return(syntaxGenerator.DefaultExpression(type)
.WithTrailingTrivia(SyntaxFactory.Comment(" /* Stop recursive mapping */")));
}
return(cache.GetOrAdd(type.ToDisplayString().TrimEnd('?'), _ =>
{
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));
}
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));
}
}