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Copy pathclassobject.cs
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executable file
·294 lines (232 loc) · 8.88 KB
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// ==========================================================================
// This software is subject to the provisions of the Zope Public License,
// Version 2.0 (ZPL). A copy of the ZPL should accompany this distribution.
// THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED
// WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
// WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS
// FOR A PARTICULAR PURPOSE.
// ==========================================================================
using System;
using System.Reflection;
using System.Runtime.InteropServices;
namespace Python.Runtime {
/// <summary>
/// Managed class that provides the implementation for reflected types.
/// Managed classes and value types are represented in Python by actual
/// Python type objects. Each of those type objects is associated with
/// an instance of ClassObject, which provides its implementation.
/// </summary>
internal class ClassObject : ClassBase {
ConstructorBinder binder;
internal ClassObject(Type tp) : base(tp) {
ConstructorInfo[] ctors = type.GetConstructors();
binder = new ConstructorBinder();
for (int i = 0; i < ctors.Length; i++) {
binder.AddMethod(ctors[i]);
}
}
//====================================================================
// Helper to get docstring from reflected constructor info.
//====================================================================
internal IntPtr GetDocString() {
MethodBase[] methods = binder.GetMethods();
string str = "";
for (int i = 0; i < methods.Length; i++) {
if (str.Length > 0)
str += Environment.NewLine;
str += methods[i].ToString();
}
return Runtime.PyString_FromString(str);
}
//====================================================================
// Implements __new__ for reflected classes and value types.
//====================================================================
[CallConvCdecl()]
public static IntPtr tp_new(IntPtr tp, IntPtr args, IntPtr kw) {
ClassObject self = GetManagedObject(tp) as ClassObject;
// Sanity check: this ensures a graceful error if someone does
// something intentially wrong like use the managed metatype for
// a class that is not really derived from a managed class.
if (self == null) {
return Exceptions.RaiseTypeError("invalid object");
}
Type type = self.type;
// Primitive types do not have constructors, but they look like
// they do from Python. If the ClassObject represents one of the
// convertible primitive types, just convert the arg directly.
if (type.IsPrimitive || type == typeof(String)) {
if (Runtime.PyTuple_Size(args) != 1) {
Exceptions.SetError(Exceptions.TypeError,
"no constructors match given arguments"
);
return IntPtr.Zero;
}
IntPtr op = Runtime.PyTuple_GetItem(args, 0);
Object result;
if (!Converter.ToManaged(op, type, out result, true)) {
return IntPtr.Zero;
}
return CLRObject.GetInstHandle(result, tp);
}
if (type.IsAbstract) {
Exceptions.SetError(Exceptions.TypeError,
"cannot instantiate abstract class"
);
return IntPtr.Zero;
}
if (type.IsEnum) {
Exceptions.SetError(Exceptions.TypeError,
"cannot instantiate enumeration"
);
return IntPtr.Zero;
}
Object obj = self.binder.InvokeRaw(IntPtr.Zero, args, kw);
if (obj == null) {
// It is possible for __new__ to be invoked on construction
// of a Python subclass of a managed class, so args may
// reflect more args than are required to instantiate the
// class. So if we cant find a ctor that matches, we'll see
// if there is a default constructor and, if so, assume that
// any extra args are intended for the subclass' __init__.
IntPtr eargs = Runtime.PyTuple_New(0);
obj = self.binder.InvokeRaw(IntPtr.Zero, eargs, kw);
Runtime.Decref(eargs);
if (obj == null) {
return IntPtr.Zero;
}
}
return CLRObject.GetInstHandle(obj, tp);
}
//====================================================================
// Implementation of [] semantics for reflected types. This mainly
// exists to implement the Array[int] syntax for creating arrays.
//====================================================================
public override IntPtr type_subscript(IntPtr ob, IntPtr idx) {
if ((this.type) != typeof(Array)) {
return Exceptions.RaiseTypeError("unsubscriptable object");
}
if (Runtime.PyTuple_Check(idx)) {
return Exceptions.RaiseTypeError("expected single type");
}
ClassBase c = GetManagedObject(idx) as ClassBase;
Type t = (c != null) ? c.type : Converter.GetTypeByAlias(idx);
if (t == null) {
return Exceptions.RaiseTypeError("type expected");
}
Array a = Array.CreateInstance(t, 0);
c = ClassManager.GetClass(a.GetType());
Runtime.Incref(c.pyHandle);
return c.pyHandle;
}
//====================================================================
// Implements __getitem__ for reflected classes and value types.
//====================================================================
[CallConvCdecl()]
public static IntPtr mp_subscript(IntPtr ob, IntPtr idx) {
ManagedType self = GetManagedObject(ob);
IntPtr tp = Runtime.PyObject_TYPE(ob);
ClassBase cls = (ClassBase)GetManagedObject(tp);
if (cls.indexer == null || !cls.indexer.CanGet) {
Exceptions.SetError(Exceptions.TypeError,
"unindexable object"
);
return IntPtr.Zero;
}
// Arg may be a tuple in the case of an indexer with multiple
// parameters. If so, use it directly, else make a new tuple
// with the index arg (method binders expect arg tuples).
IntPtr args = idx;
bool free = false;
if (!Runtime.PyTuple_Check(idx)) {
args = Runtime.PyTuple_New(1);
Runtime.Incref(idx);
Runtime.PyTuple_SetItem(args, 0, idx);
free = true;
}
IntPtr value = IntPtr.Zero;
try {
value = cls.indexer.GetItem(ob, args);
}
finally {
if (free) {
Runtime.Decref(args);
}
}
return value;
}
//====================================================================
// Implements __setitem__ for reflected classes and value types.
//====================================================================
[CallConvCdecl()]
public static int mp_ass_subscript(IntPtr ob, IntPtr idx, IntPtr v) {
ManagedType self = GetManagedObject(ob);
IntPtr tp = Runtime.PyObject_TYPE(ob);
ClassBase cls = (ClassBase)GetManagedObject(tp);
if (cls.indexer == null || !cls.indexer.CanSet) {
Exceptions.SetError(Exceptions.TypeError,
"object doesn't support item assignment x"
);
return -1;
}
// Arg may be a tuple in the case of an indexer with multiple
// parameters. If so, use it directly, else make a new tuple
// with the index arg (method binders expect arg tuples).
IntPtr args = idx;
bool free = false;
if (!Runtime.PyTuple_Check(idx)) {
args = Runtime.PyTuple_New(1);
Runtime.Incref(idx);
Runtime.PyTuple_SetItem(args, 0, idx);
free = true;
}
int i = Runtime.PyTuple_Size(args);
IntPtr real = Runtime.PyTuple_New(i + 1);
for (int n = 0; n < i; n++) {
IntPtr item = Runtime.PyTuple_GetItem(args, n);
Runtime.Incref(item);
Runtime.PyTuple_SetItem(real, n, item);
}
Runtime.Incref(v);
Runtime.PyTuple_SetItem(real, i, v);
try {
cls.indexer.SetItem(ob, real);
}
finally {
Runtime.Decref(real);
if (free) {
Runtime.Decref(args);
}
}
if (Exceptions.ErrorOccurred()) {
return -1;
}
return 0;
}
//====================================================================
// This is a hack. Generally, no managed class is considered callable
// from Python - with the exception of System.Delegate. It is useful
// to be able to call a System.Delegate instance directly, especially
// when working with multicast delegates.
//====================================================================
[CallConvCdecl()]
public static IntPtr tp_call(IntPtr ob, IntPtr args, IntPtr kw) {
ManagedType self = GetManagedObject(ob);
IntPtr tp = Runtime.PyObject_TYPE(ob);
ClassBase cb = (ClassBase)GetManagedObject(tp);
if (cb.type != typeof(System.Delegate)) {
Exceptions.SetError(Exceptions.TypeError,
"object is not callable");
return IntPtr.Zero;
}
CLRObject co = (CLRObject)ManagedType.GetManagedObject(ob);
Delegate d = co.inst as Delegate;
BindingFlags flags = BindingFlags.Public |
BindingFlags.NonPublic |
BindingFlags.Instance |
BindingFlags.Static;
MethodInfo method = d.GetType().GetMethod("Invoke", flags);
MethodBinder binder = new MethodBinder(method);
return binder.Invoke(ob, args, kw);
}
}
}