static void PopulateGenericParameters(IGenericParameterProvider publicType, CodeTypeParameterCollection parameters, AttributeFilter attributeFilter, Func <GenericParameter, bool> shouldUseParameter)
{
foreach (var parameter in publicType.GenericParameters.Where(shouldUseParameter))
{
// A little hacky. Means we get "in" and "out" prefixed on any constraints, but it's either that
// or add it as a custom attribute
var name = parameter.Name;
if (parameter.IsCovariant)
{
name = "out " + name;
}
if (parameter.IsContravariant)
{
name = "in " + name;
}
var attributeCollection = new CodeAttributeDeclarationCollection();
if (parameter.HasCustomAttributes)
{
PopulateCustomAttributes(parameter, attributeCollection, attributeFilter);
}
var typeParameter = new CodeTypeParameter(name)
{
HasConstructorConstraint =
parameter.HasDefaultConstructorConstraint && !parameter.HasNotNullableValueTypeConstraint
};
typeParameter.CustomAttributes.AddRange(attributeCollection.OfType <CodeAttributeDeclaration>().ToArray());
var nullableConstraint = parameter.GetNullabilityMap().First();
var unmanagedConstraint = parameter.CustomAttributes.Any(attr => attr.AttributeType.FullName == "System.Runtime.CompilerServices.IsUnmanagedAttribute");
if (parameter.HasNotNullableValueTypeConstraint)
{
typeParameter.Constraints.Add(unmanagedConstraint ? " unmanaged" : " struct");
}
if (parameter.HasReferenceTypeConstraint)
{
typeParameter.Constraints.Add(nullableConstraint == true ? " class?" : " class");
}
else if (nullableConstraint == false)
{
typeParameter.Constraints.Add(" notnull");
}
using (NullableContext.Push(parameter))
{
foreach (var constraint in parameter.Constraints.Where(constraint => !IsSpecialConstraint(constraint)))
{
// for generic constraints like IEnumerable<T> call to GetElementType() returns TypeReference with Name = !0
var typeReference = constraint.ConstraintType /*.GetElementType()*/.CreateCodeTypeReference(constraint);
typeParameter.Constraints.Add(typeReference);
}
}
parameters.Add(typeParameter);
}
bool IsSpecialConstraint(GenericParameterConstraint constraint)
{
// struct
if (constraint.ConstraintType is TypeReference reference && reference.FullName == "System.ValueType")
{
return(true);
}
// unmanaged
if (constraint.ConstraintType.IsUnmanaged())
{
return(true);
}
return(false);
}
}
static CodeTypeDeclaration CreateTypeDeclaration(TypeDefinition publicType, string[] whitelistedNamespacePrefixes, AttributeFilter attributeFilter)
{
if (publicType.IsDelegate())
{
return(CreateDelegateDeclaration(publicType, attributeFilter));
}
var @static = false;
TypeAttributes attributes = 0;
if (publicType.IsPublic || publicType.IsNestedPublic)
{
attributes |= TypeAttributes.Public;
}
if (publicType.IsNestedFamily || publicType.IsNestedFamilyOrAssembly)
{
attributes |= TypeAttributes.NestedFamily;
}
if (publicType.IsSealed && !publicType.IsAbstract)
{
attributes |= TypeAttributes.Sealed;
}
else if (!publicType.IsSealed && publicType.IsAbstract && !publicType.IsInterface)
{
attributes |= TypeAttributes.Abstract;
}
else if (publicType.IsSealed && publicType.IsAbstract)
{
@static = true;
}
// Static support is a hack. CodeDOM does support it, and this isn't
// correct C#, but it's good enough for our API outline
var name = publicType.Name;
var isStruct = publicType.IsValueType && !publicType.IsPrimitive && !publicType.IsEnum;
var @readonly = isStruct && publicType.CustomAttributes.Any(a =>
a.AttributeType.FullName == "System.Runtime.CompilerServices.IsReadOnlyAttribute");
var index = name.IndexOf('`');
if (index != -1)
{
name = name.Substring(0, index);
}
var declarationName = string.Empty;
if (@readonly)
{
declarationName += CodeNormalizer.ReadonlyMarker;
}
if (@static)
{
declarationName += CodeNormalizer.StaticMarker;
}
declarationName += name;
var declaration = new CodeTypeDeclaration(declarationName)
{
CustomAttributes = CreateCustomAttributes(publicType, attributeFilter),
// TypeAttributes must be specified before the IsXXX as they manipulate TypeAttributes!
TypeAttributes = attributes,
IsClass = publicType.IsClass,
IsEnum = publicType.IsEnum,
IsInterface = publicType.IsInterface,
IsStruct = isStruct,
};
if (declaration.IsInterface && publicType.BaseType != null)
{
throw new NotImplementedException("Base types for interfaces needs testing");
}
PopulateGenericParameters(publicType, declaration.TypeParameters, attributeFilter, parameter =>
{
var declaringType = publicType.DeclaringType;
while (declaringType != null)
{
if (declaringType.GenericParameters.Any(p => p.Name == parameter.Name))
{
return(false); // https://github.com/ApiApprover/ApiApprover/issues/108
}
declaringType = declaringType.DeclaringType;
}
return(true);
});
if (publicType.BaseType != null && ShouldOutputBaseType(publicType))
{
if (publicType.BaseType.FullName == "System.Enum")
{
var underlyingType = publicType.GetEnumUnderlyingType();
if (underlyingType.FullName != "System.Int32")
{
declaration.BaseTypes.Add(underlyingType.CreateCodeTypeReference());
}
}
else
{
declaration.BaseTypes.Add(publicType.BaseType.CreateCodeTypeReference(publicType));
}
}
foreach (var @interface in publicType.Interfaces.OrderBy(i => i.InterfaceType.FullName, StringComparer.Ordinal)
.Select(t => new { Reference = t, Definition = t.InterfaceType.Resolve() })
.Where(t => ShouldIncludeType(t.Definition))
.Select(t => t.Reference))
{
declaration.BaseTypes.Add(@interface.InterfaceType.CreateCodeTypeReference(@interface));
}
foreach (var memberInfo in publicType.GetMembers().Where(memberDefinition => ShouldIncludeMember(memberDefinition, whitelistedNamespacePrefixes)).OrderBy(m => m.Name, StringComparer.Ordinal))
{
AddMemberToTypeDeclaration(declaration, memberInfo, attributeFilter);
}
// Fields should be in defined order for an enum
var fields = !publicType.IsEnum
? publicType.Fields.OrderBy(f => f.Name, StringComparer.Ordinal)
: (IEnumerable <FieldDefinition>)publicType.Fields;
foreach (var field in fields)
{
AddMemberToTypeDeclaration(declaration, field, attributeFilter);
}
foreach (var nestedType in publicType.NestedTypes.Where(ShouldIncludeType).OrderBy(t => t.FullName, StringComparer.Ordinal))
{
using (NullableContext.Push(nestedType))
{
var nestedTypeDeclaration = CreateTypeDeclaration(nestedType, whitelistedNamespacePrefixes, attributeFilter);
declaration.Members.Add(nestedTypeDeclaration);
}
}
return(declaration);
}