private void AppendToConstructorFromEvent(EventInfo info, MemberMetadata metadata, CSharpSourceWriter deferWriter)
{
var addMethod = info.AddMethod;
if (addMethod.IsAbstract && !addMethod.IsAssembly && !addMethod.IsFamilyAndAssembly)
{
stubWriter.Write($"if ({metadata.Name} == null) {metadata.Name} = new EventImplementation<{metadata.HandlerArgsType}>();");
deferWriter.Write($"stub.{metadata.Name} = new EventImplementation<{metadata.HandlerArgsType}>();");
}
if (addMethod.IsStatic || addMethod.IsPrivate || !addMethod.IsVirtual || addMethod.IsAbstract || addMethod.IsAssembly || addMethod.IsFamilyAndAssembly)
{
return;
}
stubWriter.Write($"if ({metadata.Name} == null)");
using (stubWriter.Scope) {
stubWriter.Write($"{metadata.Name} = new EventImplementation<{metadata.HandlerArgsType}>();");
stubWriter.Write($"{metadata.Name}.add = value => Base{metadata.Name}Add(new {metadata.HandlerType}(value));");
stubWriter.Write($"{metadata.Name}.remove = value => Base{metadata.Name}Remove(new {metadata.HandlerType}(value));");
}
deferWriter.Write($"stub.{metadata.Name} = new EventImplementation<{metadata.HandlerArgsType}>();");
deferWriter.Write($"stub.{metadata.Name}.add = value => stub.Base{metadata.Name}Add(new {metadata.HandlerType}(value));");
deferWriter.Write($"stub.{metadata.Name}.remove = value => stub.Base{metadata.Name}Remove(new {metadata.HandlerType}(value));");
}
private void AppendConstructor(Type type, ConstructorInfo info, MemberMetadata constructorMetadata)
{
if (info.IsPrivate || info.IsStatic || info.IsFamilyAndAssembly || info.IsAssembly)
{
return;
}
var typeName = type.CreateCsName(type.Namespace);
var(basename, genericInfo) = typeName.ExtractImplementationNameParts("<");
var intermediateName = $"IntermediateStub{basename}_DoNotUse";
var stubName = $"Stub{basename}";
// for every constructor, make both a constructor and a static "DeferConstruction" method
var deferWriter = new CSharpSourceWriter(stubWriter.Indentation);
stubWriter.Write($"public {stubName}({constructorMetadata.ParameterTypesAndNames}) : base({constructorMetadata.ParameterNames})");
var outParam = $"out {stubTypeName} uninitializedStub";
var separator = constructorMetadata.ParameterTypesAndNames.Length > 0 ? ", " : string.Empty;
deferWriter.Write($"public static IDisposable DeferConstruction({constructorMetadata.ParameterTypesAndNames}{separator}{outParam})");
using (stubWriter.Scope) {
using (deferWriter.Scope) {
deferWriter.Write($"{stubTypeName} stub;");
deferWriter.Write($"var disposable = ConstructionCompletion.CreateObjectWithDeferredConstruction<{stubTypeName}>(out stub{separator}{constructorMetadata.ParameterNames});");
foreach (var member in Program.FindAllMembers(type))
{
var metadata = new MemberMetadata(member, type.Namespace);
switch (member.MemberType)
{
case MemberTypes.Method: AppendToConstructorFromMethod((MethodInfo)member, metadata, deferWriter); break;
case MemberTypes.Event: AppendToConstructorFromEvent((EventInfo)member, metadata, deferWriter); break;
case MemberTypes.Property: AppendToConstructorFromProperty((PropertyInfo)member, metadata, deferWriter); break;
default:
// the only other options are Field, Type, NestedType, and Constructor
// none of those can be virtual/abstract, so we don't need to put anything in the constructor for them.
break;
}
}
deferWriter.Write($"uninitializedStub = stub;");
deferWriter.Write($"return disposable;");
}
}
stubWriter.Write(deferWriter.ToString());
intermediateWriter.Write($"protected {intermediateName}({constructorMetadata.ParameterTypesAndNames}) : base({constructorMetadata.ParameterNames}) {{ }}");
}
/// <summary>
/// Creates a Builder of the given generic type to implement the given interface.
/// Output is placed in the given fileName.
/// </summary>
private static void GenerateImplementation <TPatternBuilder>(Type type)
where TPatternBuilder : IPatternBuilder
{
var writer = new CSharpSourceWriter(numberOfSpacesToIndent: 4);
var builder = (TPatternBuilder)Activator.CreateInstance(typeof(TPatternBuilder), writer);
var fileName = builder.GetDesiredOutputFileName(type);
Console.WriteLine($"Generating {fileName} ...");
writer.Write($"// this file was created by AutoImplement");
writer.Write($"namespace {type.Namespace}");
using (writer.Scope) {
writer.Write($"public class {builder.ClassDeclaration(type)}");
using (writer.Scope) {
builder.AppendExtraMembers(type);
var allMembers = FindAllMembers(type);
foreach (var member in allMembers)
{
var metadata = new MemberMetadata(member, type.Namespace);
switch (member.MemberType)
{
case MemberTypes.Method: ImplementMethod(member, metadata, builder); break;
case MemberTypes.Event: ImplementEvent(member, metadata, builder); break;
case MemberTypes.Property: ImplementProperty(member, metadata, builder); break;
default:
// the only other options are Field, Type, NestedType, and Constructor
// for classes, any of these are possible, and all can be ignored.
break;
}
}
}
builder.BuildCompleted();
}
File.WriteAllText(fileName, writer.ToString());
}
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})");
}
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 AppendToConstructorFromProperty(PropertyInfo info, MemberMetadata metadata, CSharpSourceWriter deferWriter)
{
var method = info.GetMethod ?? info.SetMethod;
if (method.IsAbstract && !method.IsAssembly && !method.IsFamilyAndAssembly)
{
if (info.Name == "Item" && info.GetIndexParameters().Length > 0)
{
// item property maps to two methods, get_Item and set_Item
// but since the property is abstract, we have no base implementation
// so just like methods, give no default values in the constructor (or defer construction call)
}
else
{
stubWriter.Write($"if ({metadata.Name} == null) {metadata.Name} = new PropertyImplementation<{metadata.ReturnType}>();");
deferWriter.Write($"stub.{metadata.Name} = new PropertyImplementation<{metadata.ReturnType}>();");
}
}
if (method.IsStatic || method.IsPrivate || !method.IsVirtual || method.IsAbstract || method.IsAssembly || method.IsFamilyAndAssembly)
{
return;
}
if (info.Name == "Item" && info.GetIndexParameters().Length > 0)
{
if (info.CanRead)
{
stubWriter.Write($"if (get_Item == null) get_Item = Base_get_Item;");
}
if (CanWrite(info))
{
stubWriter.Write($"if (set_Item == null) set_Item = Base_set_Item;");
}
if (info.CanRead)
{
deferWriter.Write($"stub.get_Item = stub.Base_get_Item;");
}
if (CanWrite(info))
{
deferWriter.Write($"stub.set_Item = stub.Base_set_Item;");
}
}
else
{
stubWriter.Write($"if ({metadata.Name} == null)");
using (stubWriter.Scope) {
stubWriter.Write($"{metadata.Name} = new PropertyImplementation<{metadata.ReturnType}>();");
if (info.CanRead)
{
stubWriter.Write($"{metadata.Name}.get = () => Base{metadata.Name};");
}
if (CanWrite(info))
{
stubWriter.Write($"{metadata.Name}.set = value => Base{metadata.Name} = value;");
}
}
deferWriter.Write($"stub.{metadata.Name} = new PropertyImplementation<{metadata.ReturnType}>();");
if (info.CanRead)
{
deferWriter.Write($"stub.{metadata.Name}.get = () => stub.Base{metadata.Name};");
}
if (CanWrite(info))
{
deferWriter.Write($"stub.{metadata.Name}.set = value => stub.Base{metadata.Name} = value;");
}
}
}
// <example>
// public Func<int, int, int> Max { get; set; }
// int ICalculator.Max(int a, int b)
// {
// if (Max != null)
// {
// return this.Max(a, b);
// }
// else
// {
// return default(int);
// }
// }
//
// public Func<double, double, double> Max_double_double { get; set; }
// double ICalculator.Max(double a, double b)
// {
// if (Max_double_double != null)
// {
// return this.Max_double_double(a, b);
// }
// else
// {
// return default(double);
// }
// }
// </example>
/// <remarks>
/// Methods in interfaces are replaced with delegate properties.
/// Assigning one of those delegates a value will change the behavior of that method.
/// You can call the delegate just like the method.
/// When the interface method is called, it will call the delegate method if possible.
/// If there is no delegate, it returns default.
/// </remarks>
public void AppendMethod(MethodInfo info, MemberMetadata method)
{
if (info.IsGenericMethodDefinition)
{
AppendGenericMethod(info, method);
return;
}
var delegateName = GetStubName(method.ReturnType, method.ParameterTypes);
var typesExtension = SanitizeMethodName(method.ParameterTypes);
var methodsWithMatchingNameButNotSignature = implementedMethods.Where(name => name.Split('(')[0] == method.Name && name != $"{method.Name}({method.ParameterTypes})");
string localImplementationName = methodsWithMatchingNameButNotSignature.Any() ? $"{method.Name}_{typesExtension}" : method.Name;
if (info.GetParameters().Any(p => p.ParameterType.IsByRef))
{
localImplementationName = $"{method.Name}_{typesExtension}";
delegateName = $"{method.Name}Delegate_{typesExtension}";
writer.Write($"public delegate {method.ReturnType} {delegateName}({method.ParameterTypesAndNames});" + Environment.NewLine);
}
// only add a delegation property for the first method with a given signature
// this is important for IEnumerable<T>.GetEnumerator() and IEnumerable.GetEnumerator() -> same name, same signature
if (!implementedMethods.Any(name => name == $"{method.Name}({method.ParameterTypes})"))
{
writer.Write($"public {delegateName} {localImplementationName} {{ get; set; }}" + Environment.NewLine);
}
ImplementInterfaceMethod(info, localImplementationName, method);
writer.Write(string.Empty);
implementedMethods.Add($"{method.Name}({method.ParameterTypes})");
}
// <example>
// public void DoThing(int arg)
// {
// for (int i = 0; i < base.Count; i++)
// {
// base[i].DoThing(arg);
// }
// }
// </example>
/// <remarks>
/// Composite methods with return types are a bit strange.
/// If all the methods agree on what to return, then return that.
/// If any are different, then just return default.
/// In the case of nullables and bools, this default seems appropriate.
/// But it can be strange for numeric types.
///
/// For methods that return void, a composite simply forwards the method call down to each thing that it contains.
/// </remarks>
public void AppendMethod(MethodInfo info, MemberMetadata method)
{
// Use an explicit implementation only if the signature has already been used
// example: IEnumerable<T>, which extends IEnumerable
if (!implementedMethods.Any(name => name == $"{method.Name}({method.ParameterTypes})"))
{
writer.Write($"public virtual {method.ReturnType} {method.Name}{method.GenericParameters}({method.ParameterTypesAndNames}){method.GenericParameterConstraints}");
}
else
{
writer.Write($"{method.ReturnType} {method.DeclaringType}.{method.Name}{method.GenericParameters}({method.ParameterTypesAndNames}){method.GenericParameterConstraints}");
}
using (writer.Scope) {
writer.AssignDefaultValuesToOutParameters(info.DeclaringType.Namespace, info.GetParameters());
if (method.ReturnType == "void")
{
writer.Write("for (int i = 0; i < base.Count; i++)");
using (writer.Scope) {
writer.Write($"base[i].{method.Name}{method.GenericParameters}({method.ParameterNames});");
}
}
else
{
writer.Write($"var results = new System.Collections.Generic.List<{method.ReturnType}>();");
writer.Write("for (int i = 0; i < base.Count; i++)");
using (writer.Scope) {
writer.Write($"results.Add(base[i].{method.Name}{method.GenericParameters}({method.ParameterNames}));");
}
writer.Write("if (results.Count > 0 && results.All(result => result.Equals(results[0])))");
using (writer.Scope) {
writer.Write("return results[0];");
}
writer.Write($"return default({method.ReturnType});");
}
}
writer.Write(string.Empty);
implementedMethods.Add($"{method.Name}({method.ParameterTypes})");
}
