/// <summary>
/// Normally, making a stub method on a baseclass requires two overrides with the same name.
/// An override method, and a new delegate field with the same name.
/// But for generic methods, a delegate field with the same name won't work.
/// Instead, we have a generic delegate, a dictionary for overrides, a caller for the base method, an "ImplementMember" method, and an override for the method.
/// Since all of these have different names, we can put all the overrides in a single class.
/// So don't put anything in the helper intermediate class.
/// </summary>
private void AppendGenericMethod(MethodInfo info, MemberMetadata metadata)
{
var typesExtension = StubBuilder.SanitizeMethodName(metadata.ParameterTypes);
var typeofList = info.GetGenericArguments().Select(type => $"typeof({type.Name})").Aggregate((a, b) => $"{a}, {b}");
var createKey = $"var key = new Type[] {{ {typeofList} }};";
var delegateName = $"{metadata.Name}Delegate_{typesExtension}{metadata.GenericParameters}";
var dictionary = $"{metadata.Name}Delegates_{typesExtension}";
var methodName = $"{metadata.Name}{metadata.GenericParameters}";
stubWriter.Write($"public delegate {metadata.ReturnType} {delegateName}({metadata.ParameterTypesAndNames}){metadata.GenericParameterConstraints};");
stubWriter.Write($"private readonly Dictionary<Type[], object> {dictionary} = new Dictionary<Type[], object>(new EnumerableEqualityComparer<Type>());");
stubWriter.Write($"public void Implement{methodName}({delegateName} implementation){metadata.GenericParameterConstraints}");
using (stubWriter.Scope) {
stubWriter.Write(createKey);
stubWriter.Write($"{dictionary}[key] = implementation;");
}
if (!info.IsAbstract)
{
stubWriter.Write($"public {metadata.ReturnType} Base{methodName}({metadata.ParameterTypesAndNames}){metadata.GenericParameterConstraints}");
using (stubWriter.Scope) {
stubWriter.Write($"{metadata.ReturnClause}base.{methodName}({metadata.ParameterNames});");
}
}
stubWriter.Write($"{metadata.Access} override {metadata.ReturnType} {methodName}({metadata.ParameterTypesAndNames})");
using (stubWriter.Scope) {
stubWriter.AssignDefaultValuesToOutParameters(info.DeclaringType.Namespace, info.GetParameters());
stubWriter.Write(createKey);
stubWriter.Write("object implementation;");
stubWriter.Write($"if ({dictionary}.TryGetValue(key, out implementation))");
using (stubWriter.Scope) {
stubWriter.Write($"{metadata.ReturnClause}(({delegateName})implementation).Invoke({metadata.ParameterNames});");
}
stubWriter.Write("else");
using (stubWriter.Scope) {
if (!info.IsAbstract)
{
stubWriter.Write($"{metadata.ReturnClause}Base{methodName}({metadata.ParameterNames});");
}
else if (metadata.ReturnType != "void")
{
stubWriter.Write($"return default({metadata.ReturnType});");
}
}
}
}
public void AppendMethod(MethodInfo info, MemberMetadata metadata)
{
if (info.IsStatic || info.IsPrivate || info.IsAssembly || info.IsFamilyAndAssembly)
{
return;
}
if (!info.IsVirtual && !info.IsAbstract)
{
if (metadata.Access == "protected")
{
// the member is protected. Make a public version.
stubWriter.Write($"public new {metadata.ReturnType} {metadata.Name}{metadata.GenericParameters}({metadata.ParameterTypesAndNames}){metadata.GenericParameterConstraints}");
using (stubWriter.Scope) {
stubWriter.Write($"{metadata.ReturnClause}base.{metadata.Name}({metadata.ParameterNames});");
}
}
return;
}
if (info.IsGenericMethodDefinition)
{
AppendGenericMethod(info, metadata);
return;
}
var delegateName = GetDelegateName(metadata.ReturnType, metadata.ParameterTypes);
var typesExtension = StubBuilder.SanitizeMethodName(metadata.ParameterTypes);
var methodsWithMatchingNameButNotSignature = implementedMethods.Where(name => name.Split('(')[0] == metadata.Name && name != $"{metadata.Name}({metadata.ParameterTypes})");
string localImplementationName = methodsWithMatchingNameButNotSignature.Any() ? $"{metadata.Name}_{typesExtension}" : metadata.Name;
if (info.GetParameters().Any(p => p.ParameterType.IsByRef))
{
delegateName = $"{metadata.Name}Delegate_{typesExtension}";
stubWriter.Write($"public delegate {metadata.ReturnType} {delegateName}({metadata.ParameterTypesAndNames});" + Environment.NewLine);
}
stubWriter.Write($"public new {delegateName} {localImplementationName};");
WriteHelperBaseMethod(info, metadata);
WriteHelperMethod(info, metadata, stubTypeName, localImplementationName);
implementedMethods.Add($"{metadata.Name}({metadata.ParameterTypes})");
}
private void AppendToConstructorFromMethod(MethodInfo info, MemberMetadata metadata, CSharpSourceWriter deferWriter)
{
if (info.IsSpecialName || info.IsStatic || info.IsPrivate || !info.IsVirtual || info.IsAbstract || info.IsAssembly || info.IsFamilyAndAssembly || info.IsGenericMethod)
{
return;
}
if (info.IsVirtual && info.Name == "Finalize")
{
return; // Finalize is special in C#. Use a destructor instead.
}
var typesExtension = StubBuilder.SanitizeMethodName(metadata.ParameterTypes);
var methodsWithMatchingNameButNotSignature = implementedMethods.Where(name => name.Split('(')[0] == metadata.Name && name != $"{metadata.Name}({metadata.ParameterTypes})");
string localImplementationName = methodsWithMatchingNameButNotSignature.Any() ? $"{metadata.Name}_{typesExtension}" : metadata.Name;
stubWriter.Write($"if ({localImplementationName} == null) {localImplementationName} = Base{metadata.Name};");
deferWriter.Write($"stub.{localImplementationName} = stub.Base{metadata.Name};");
implementedMethods.Add($"{metadata.Name}({metadata.ParameterTypes})");
}