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// Copyright (c) Microsoft Corporation. All rights reserved.
//
using System;
using System.Collections.Generic;
using System.Xml;
using System.Xml.XPath;
using System.Compiler;
using Microsoft.Ddue.Tools.Reflection;
namespace Microsoft.Ddue.Tools {
// Extension method add in
public class ExtensionMethodAddIn : MRefBuilderAddIn {
private Dictionary < TypeNode, List < Method > > index = new Dictionary < TypeNode, List < Method > >();
private bool isExtensionMethod = false;
private ManagedReflectionWriter reflector;
public ExtensionMethodAddIn(ManagedReflectionWriter reflector, XPathNavigator configuration) : base(reflector, configuration) {
this.reflector = reflector;
reflector.RegisterStartTagCallback("apis", new MRefBuilderCallback(RecordExtensionMethods));
reflector.RegisterEndTagCallback("elements", new MRefBuilderCallback(AddExtensionMethods));
reflector.RegisterStartTagCallback("apidata", new MRefBuilderCallback(AddExtensionSubsubgroup));
}
private void AddExtensionMethod(XmlWriter writer, TypeNode type, Method extensionMethodTemplate, TypeNode specialization) {
// Construct the extension method for naming
Method extensionMethodTemplate2 = extensionMethodTemplate;
if (extensionMethodTemplate2.IsGeneric && (specialization != null)) extensionMethodTemplate2 = extensionMethodTemplate.GetTemplateInstance(type, specialization);
TypeNode extensionMethodTemplateReturnType = extensionMethodTemplate2.ReturnType;
ParameterList extensionMethodTemplateParameters = extensionMethodTemplate2.Parameters;
ParameterList extensionMethodParameters = new ParameterList();
for (int i = 1; i < extensionMethodTemplateParameters.Length; i++) {
Parameter extensionMethodParameter = extensionMethodTemplateParameters[i];
extensionMethodParameters.Add(extensionMethodParameter);
}
Method extensionMethod = new Method(extensionMethodTemplate.DeclaringType, new AttributeList(), extensionMethodTemplate.Name, extensionMethodParameters, extensionMethodTemplate.ReturnType, null);
extensionMethod.Flags = extensionMethodTemplate.Flags & ~MethodFlags.Static;
//Method specializedMethod == extensionMethod.Get
// Get the names
string extensionMethodId = reflector.ApiNamer.GetMemberName(extensionMethod);
string extensionMethodTemplateId = reflector.ApiNamer.GetMemberName(extensionMethodTemplate);
writer.WriteStartElement("element");
writer.WriteAttributeString("api", extensionMethodTemplateId);
writer.WriteAttributeString("display-api", extensionMethodId);
writer.WriteAttributeString("source", "extension");
isExtensionMethod = true;
reflector.WriteMember(extensionMethod);
isExtensionMethod = false;
writer.WriteEndElement();
}
private void AddExtensionMethods(XmlWriter writer, Object info) {
MemberDictionary members = info as MemberDictionary;
if (members == null) return;
TypeNode type = members.Type;
InterfaceList contracts = type.Interfaces;
foreach (Interface contract in contracts) {
List < Method > extensionMethods = null;
if (index.TryGetValue(contract, out extensionMethods)) {
foreach (Method extensionMethod in extensionMethods) AddExtensionMethod(writer, type, extensionMethod, null);
}
if (contract.IsGeneric && (contract.TemplateArguments != null) && (contract.TemplateArguments.Length > 0)) {
Interface templateContract = (Interface)ReflectionUtilities.GetTemplateType(contract);
TypeNode specialization = contract.TemplateArguments[0];
if (index.TryGetValue(templateContract, out extensionMethods)) {
foreach (Method extensionMethod in extensionMethods) {
if (IsValidTemplateArgument(specialization, extensionMethod.TemplateParameters[0])) {
AddExtensionMethod(writer, type, extensionMethod, specialization);
}
}
}
}
}
TypeNode comparisonType = type;
while (comparisonType != null) {
List < Method > extensionMethods = null;
if (index.TryGetValue(comparisonType, out extensionMethods)) {
foreach (Method extensionMethod in extensionMethods) AddExtensionMethod(writer, type, extensionMethod, null);
}
if (comparisonType.IsGeneric && (comparisonType.TemplateArguments != null) && (comparisonType.TemplateArguments.Length > 0)) {
TypeNode templateType = ReflectionUtilities.GetTemplateType(comparisonType);
TypeNode specialization = comparisonType.TemplateArguments[0];
if (index.TryGetValue(templateType, out extensionMethods)) {
foreach (Method extensionMethod in extensionMethods) {
if (IsValidTemplateArgument(specialization, extensionMethod.TemplateParameters[0])) {
AddExtensionMethod(writer, type, extensionMethod, specialization);
}
}
}
}
comparisonType = comparisonType.BaseType;
}
}
private void AddExtensionSubsubgroup(XmlWriter writer, Object data) {
if (isExtensionMethod) writer.WriteAttributeString("subsubgroup", "extension");
}
private bool HasExtensionAttribute(Method method) {
AttributeList attributes = method.Attributes;
foreach (AttributeNode attribute in attributes) {
if (attribute.Type.FullName == "System.Runtime.CompilerServices.ExtensionAttribute") return (true);
}
return (false);
}
private bool IsValidTemplateArgument(TypeNode type, TypeNode parameter) {
if (type == null) throw new ArgumentNullException("type");
if (parameter == null) throw new ArgumentNullException("parameter");
// check that the parameter really is a type parameter
ITypeParameter itp = parameter as ITypeParameter;
if (itp == null) throw new ArgumentException("parameter");
// test constraints
bool reference = ((itp.TypeParameterFlags & TypeParameterFlags.ReferenceTypeConstraint) > 0);
if (reference && type.IsValueType) return (false);
bool value = ((itp.TypeParameterFlags & TypeParameterFlags.ValueTypeConstraint) > 0);
if (value && !type.IsValueType) return (false);
bool constructor = ((itp.TypeParameterFlags & TypeParameterFlags.DefaultConstructorConstraint) > 0);
InterfaceList contracts = parameter.Interfaces;
if (contracts != null) {
foreach (Interface contract in contracts) {
if (!type.IsAssignableTo(contract)) return (false);
}
}
TypeNode parent = parameter.BaseType;
if ((parent != null) && !type.IsAssignableTo(parent)) return (false);
// okay, passed all tests
return (true);
}
private void RecordExtensionMethods(XmlWriter writer, Object info) {
NamespaceList spaces = (NamespaceList)info;
foreach (Namespace space in spaces) {
TypeNodeList types = space.Types;
foreach (TypeNode type in types) {
MemberList members = type.Members;
// go through the members, looking for fields signaling attached properties
foreach (Member member in members) {
Method method = member as Method;
if (method == null) continue;
if (!reflector.ApiFilter.IsExposedMember(method)) continue;
if (!HasExtensionAttribute(method)) continue;
ParameterList parameters = method.Parameters;
TypeNode extendedType = parameters[0].Type;
// recognize Method<T>(Type<T>, ...) extension methods
if (method.IsGeneric && (method.TemplateParameters.Length == 1)) {
if (extendedType.IsGeneric && (extendedType.TemplateArguments != null) && (extendedType.TemplateArguments.Length == 1)) {
TypeNode arg = extendedType.TemplateArguments[0];
if (arg.IsTemplateParameter) {
ITypeParameter gtp = (ITypeParameter)arg;
if ((gtp.DeclaringMember == method) && (gtp.ParameterListIndex == 0)) {
extendedType = ReflectionUtilities.GetTemplateType(extendedType);
}
}
}
}
List < Method > methods = null;
if (!index.TryGetValue(extendedType, out methods)) {
methods = new List < Method >();
index.Add(extendedType, methods);
}
methods.Add(method);
}
}
}
/*
Console.WriteLine("Recorded {0} extension methods", index.Count);
foreach (TypeNode type in index.Keys) {
Console.WriteLine(type.FullName);
}
*/
}
}
}
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