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369 lines
13 KiB
C#
369 lines
13 KiB
C#
// ==========================================================================
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// This software is subject to the provisions of the Zope Public License,
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// Version 2.0 (ZPL). A copy of the ZPL should accompany this distribution.
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// THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED
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// WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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// WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS
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// FOR A PARTICULAR PURPOSE.
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// ==========================================================================
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using System;
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using System.Runtime.InteropServices;
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using System.Collections.Generic;
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using System.Collections;
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using System.Reflection;
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using System.Security;
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namespace Python.Runtime {
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/// <summary>
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/// The ClassManager is responsible for creating and managing instances
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/// that implement the Python type objects that reflect managed classes.
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///
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/// Each managed type reflected to Python is represented by an instance
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/// of a concrete subclass of ClassBase. Each instance is associated with
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/// a generated Python type object, whose slots point to static methods
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/// of the managed instance's class.
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/// </summary>
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internal class ClassManager {
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static Dictionary<Type, ClassBase> cache;
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static Type dtype;
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private ClassManager() {}
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static ClassManager() {
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cache = new Dictionary<Type, ClassBase>(128);
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// SEE: http://msdn.microsoft.com/en-us/library/96b1ayy4%28VS.90%29.aspx
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// ""All delegates inherit from MulticastDelegate, which inherits from Delegate.""
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// Was Delegate, which caused a null MethodInfo returned from GetMethode("Invoke")
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// and crashed on Linux under Mono.
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dtype = typeof(System.MulticastDelegate);
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}
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//====================================================================
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// Return the ClassBase-derived instance that implements a particular
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// reflected managed type, creating it if it doesn't yet exist.
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//====================================================================
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internal static ClassBase GetClass(Type type) {
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ClassBase cb = null;
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cache.TryGetValue(type, out cb);
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if (cb != null) {
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return cb;
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}
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cb = CreateClass(type);
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cache.Add(type, cb);
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return cb;
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}
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//====================================================================
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// Create a new ClassBase-derived instance that implements a reflected
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// managed type. The new object will be associated with a generated
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// Python type object.
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//====================================================================
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private static ClassBase CreateClass(Type type) {
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// First, we introspect the managed type and build some class
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// information, including generating the member descriptors
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// that we'll be putting in the Python class __dict__.
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ClassInfo info = GetClassInfo(type);
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// Next, select the appropriate managed implementation class.
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// Different kinds of types, such as array types or interface
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// types, want to vary certain implementation details to make
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// sure that the type semantics are consistent in Python.
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ClassBase impl;
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// Check to see if the given type extends System.Exception. This
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// lets us check once (vs. on every lookup) in case we need to
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// wrap Exception-derived types in old-style classes
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if (type.ContainsGenericParameters) {
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impl = new GenericType(type);
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}
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else if (type.IsSubclassOf(dtype)) {
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impl = new DelegateObject(type);
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}
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else if (type.IsArray) {
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impl = new ArrayObject(type);
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}
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else if (type.IsInterface) {
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impl = new InterfaceObject(type);
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}
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else if (type == typeof(Exception) ||
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type.IsSubclassOf(typeof(Exception))) {
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impl = new ExceptionClassObject(type);
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}
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else {
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impl = new ClassObject(type);
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}
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impl.indexer = info.indexer;
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// Now we allocate the Python type object to reflect the given
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// managed type, filling the Python type slots with thunks that
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// point to the managed methods providing the implementation.
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IntPtr tp = TypeManager.GetTypeHandle(impl, type);
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impl.tpHandle = tp;
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// Finally, initialize the class __dict__ and return the object.
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IntPtr dict = Marshal.ReadIntPtr(tp, TypeOffset.tp_dict);
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IDictionaryEnumerator iter = info.members.GetEnumerator();
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while(iter.MoveNext()) {
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ManagedType item = (ManagedType)iter.Value;
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string name = (string)iter.Key;
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Runtime.PyDict_SetItemString(dict, name, item.pyHandle);
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}
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// If class has constructors, generate an __doc__ attribute.
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IntPtr doc;
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Type marker = typeof(DocStringAttribute);
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Attribute[] attrs = (Attribute[])type.GetCustomAttributes(marker, false);
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if (attrs.Length == 0) {
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doc = IntPtr.Zero;
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}
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else {
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DocStringAttribute attr = (DocStringAttribute)attrs[0];
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string docStr = attr.DocString;
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doc = Runtime.PyString_FromString(docStr);
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Runtime.PyDict_SetItemString(dict, "__doc__", doc);
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Runtime.Decref(doc);
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}
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ClassObject co = impl as ClassObject;
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// If this is a ClassObject AND it has constructors, generate a __doc__ attribute.
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// required that the ClassObject.ctors be changed to internal
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if (co != null) {
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if (co.ctors.Length > 0) {
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// Implement Overloads on the class object
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ConstructorBinding ctors = new ConstructorBinding(type, tp, co.binder);
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// ExtensionType types are untracked, so don't Incref() them.
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// XXX deprecate __overloads__ soon...
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Runtime.PyDict_SetItemString(dict, "__overloads__", ctors.pyHandle);
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Runtime.PyDict_SetItemString(dict, "Overloads", ctors.pyHandle);
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if (doc == IntPtr.Zero) {
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doc = co.GetDocString();
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Runtime.PyDict_SetItemString(dict, "__doc__", doc);
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Runtime.Decref(doc);
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}
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}
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}
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return impl;
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}
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private static ClassInfo GetClassInfo(Type type) {
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ClassInfo ci = new ClassInfo(type);
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Hashtable methods = new Hashtable();
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ArrayList list;
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MethodInfo meth;
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ManagedType ob;
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String name;
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Object item;
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Type tp;
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int i, n;
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// This is complicated because inheritance in Python is name
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// based. We can't just find DeclaredOnly members, because we
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// could have a base class A that defines two overloads of a
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// method and a class B that defines two more. The name-based
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// descriptor Python will find needs to know about inherited
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// overloads as well as those declared on the sub class.
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BindingFlags flags = BindingFlags.Static |
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BindingFlags.Instance |
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BindingFlags.Public |
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BindingFlags.NonPublic;
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MemberInfo[] info = type.GetMembers(flags);
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Hashtable local = new Hashtable();
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ArrayList items = new ArrayList();
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MemberInfo m;
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// Loop through once to find out which names are declared
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for (i = 0; i < info.Length; i++) {
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m = info[i];
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if (m.DeclaringType == type) {
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local[m.Name] = 1;
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}
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}
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// Now again to filter w/o losing overloaded member info
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for (i = 0; i < info.Length; i++) {
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m = info[i];
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if (local[m.Name] != null) {
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items.Add(m);
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}
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}
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if (type.IsInterface) {
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// Interface inheritance seems to be a different animal:
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// more contractual, less structural. Thus, a Type that
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// represents an interface that inherits from another
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// interface does not return the inherited interface's
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// methods in GetMembers. For example ICollection inherits
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// from IEnumerable, but ICollection's GetMemebers does not
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// return GetEnumerator.
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//
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// Not sure if this is the correct way to fix this, but it
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// seems to work. Thanks to Bruce Dodson for the fix.
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Type[] inheritedInterfaces = type.GetInterfaces();
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for (i = 0; i < inheritedInterfaces.Length; ++i) {
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Type inheritedType = inheritedInterfaces[i];
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MemberInfo[] imembers = inheritedType.GetMembers(flags);
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for (n = 0; n < imembers.Length; n++) {
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m = imembers[n];
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if (local[m.Name] == null) {
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items.Add(m);
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}
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}
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}
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}
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for (i = 0; i < items.Count; i++) {
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MemberInfo mi = (MemberInfo)items[i];
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switch(mi.MemberType) {
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case MemberTypes.Method:
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meth = (MethodInfo) mi;
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if (!(meth.IsPublic || meth.IsFamily ||
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meth.IsFamilyOrAssembly))
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continue;
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name = meth.Name;
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item = methods[name];
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if (item == null) {
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item = methods[name] = new ArrayList();
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}
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list = (ArrayList) item;
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list.Add(meth);
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continue;
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case MemberTypes.Property:
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PropertyInfo pi = (PropertyInfo) mi;
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MethodInfo mm = null;
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try {
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mm = pi.GetGetMethod(true);
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if (mm == null) {
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mm = pi.GetSetMethod(true);
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}
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}
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catch (SecurityException) {
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// GetGetMethod may try to get a method protected by
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// StrongNameIdentityPermission - effectively private.
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continue;
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}
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if (mm == null) {
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continue;
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}
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if (!(mm.IsPublic || mm.IsFamily || mm.IsFamilyOrAssembly))
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continue;
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// Check for indexer
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ParameterInfo[] args = pi.GetIndexParameters();
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if (args.GetLength(0) > 0) {
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Indexer idx = ci.indexer;
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if (idx == null) {
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ci.indexer = new Indexer();
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idx = ci.indexer;
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}
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idx.AddProperty(pi);
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continue;
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}
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ob = new PropertyObject(pi);
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ci.members[pi.Name] = ob;
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continue;
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case MemberTypes.Field:
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FieldInfo fi = (FieldInfo) mi;
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if (!(fi.IsPublic || fi.IsFamily || fi.IsFamilyOrAssembly))
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continue;
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ob = new FieldObject(fi);
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ci.members[mi.Name] = ob;
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continue;
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case MemberTypes.Event:
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EventInfo ei = (EventInfo)mi;
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MethodInfo me = ei.GetAddMethod(true);
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if (!(me.IsPublic || me.IsFamily || me.IsFamilyOrAssembly))
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continue;
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ob = new EventObject(ei);
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ci.members[ei.Name] = ob;
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continue;
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case MemberTypes.NestedType:
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tp = (Type) mi;
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if (!(tp.IsNestedPublic || tp.IsNestedFamily ||
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tp.IsNestedFamORAssem))
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continue;
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ob = ClassManager.GetClass(tp);
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ci.members[mi.Name] = ob;
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continue;
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}
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}
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IDictionaryEnumerator iter = methods.GetEnumerator();
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while(iter.MoveNext()) {
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name = (string) iter.Key;
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list = (ArrayList) iter.Value;
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MethodInfo[] mlist = (MethodInfo[])list.ToArray(
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typeof(MethodInfo)
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);
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ob = new MethodObject(name, mlist);
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ci.members[name] = ob;
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}
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return ci;
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}
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}
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internal class ClassInfo {
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internal ClassInfo(Type t) {
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members = new Hashtable();
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indexer = null;
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}
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public Hashtable members;
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public Indexer indexer;
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}
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}
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