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170 lines (132 loc) · 6.11 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.Collections;
using System.Reflection;
using System.Security;
using System.Runtime.InteropServices;
namespace Python.Runtime {
/// <summary>
/// Base class for Python types that reflect managed types / classes.
/// Concrete subclasses include ClassObject and DelegateObject. This
/// class provides common attributes and common machinery for doing
/// class initialization (initialization of the class __dict__). The
/// concrete subclasses provide slot implementations appropriate for
/// each variety of reflected type.
/// </summary>
internal class ClassBase : ManagedType {
internal Indexer indexer;
internal Type type;
internal ClassBase(Type tp) : base() {
indexer = null;
type = tp;
}
internal virtual bool CanSubclass() {
return (!this.type.IsEnum);
}
//====================================================================
// Implements __init__ for reflected classes and value types.
//====================================================================
public static int tp_init(IntPtr ob, IntPtr args, IntPtr kw) {
return 0;
}
//====================================================================
// Default implementation of [] semantics for reflected types.
//====================================================================
public virtual IntPtr type_subscript(IntPtr idx) {
return Exceptions.RaiseTypeError("unsubscriptable object");
}
//====================================================================
// Standard comparison implementation for instances of reflected types.
//====================================================================
public static int tp_compare(IntPtr ob, IntPtr other) {
if (ob == other) {
return 0;
}
CLRObject co1 = GetManagedObject(ob) as CLRObject;
CLRObject co2 = GetManagedObject(other) as CLRObject;
Object o1 = co1.inst;
Object o2 = co2.inst;
if (Object.Equals(o1, o2)) {
return 0;
}
return -1;
}
//====================================================================
// Standard iteration support for instances of reflected types. This
// allows natural iteration over objects that either are IEnumerable
// or themselves support IEnumerator directly.
//====================================================================
public static IntPtr tp_iter(IntPtr ob) {
CLRObject co = GetManagedObject(ob) as CLRObject;
if (co == null) {
return Exceptions.RaiseTypeError("invalid object");
}
IEnumerable e = co.inst as IEnumerable;
IEnumerator o;
if (e != null) {
o = e.GetEnumerator();
}
else {
o = co.inst as IEnumerator;
if (o == null) {
string message = "iteration over non-sequence";
return Exceptions.RaiseTypeError(message);
}
}
return new Iterator(o).pyHandle;
}
//====================================================================
// Standard __hash__ implementation for instances of reflected types.
//====================================================================
public static IntPtr tp_hash(IntPtr ob) {
CLRObject co = GetManagedObject(ob) as CLRObject;
if (co == null) {
return Exceptions.RaiseTypeError("unhashable type");
}
return new IntPtr(co.inst.GetHashCode());
}
//====================================================================
// Standard __str__ implementation for instances of reflected types.
//====================================================================
public static IntPtr tp_str(IntPtr ob) {
CLRObject co = GetManagedObject(ob) as CLRObject;
if (co == null) {
return Exceptions.RaiseTypeError("invalid object");
}
return Runtime.PyString_FromString(co.inst.ToString());
}
//====================================================================
// Default implementations for required Python GC support.
//====================================================================
public static int tp_traverse(IntPtr ob, IntPtr func, IntPtr args) {
return 0;
}
public static int tp_clear(IntPtr ob) {
return 0;
}
public static int tp_is_gc(IntPtr type) {
return 1;
}
//====================================================================
// Standard dealloc implementation for instances of reflected types.
//====================================================================
public static void tp_dealloc(IntPtr ob) {
ManagedType self = GetManagedObject(ob);
IntPtr dict = Marshal.ReadIntPtr(ob, ObjectOffset.ob_dict);
if (dict != IntPtr.Zero) {
Runtime.Decref(dict);
}
Runtime.PyObject_GC_UnTrack(self.pyHandle);
Runtime.PyObject_GC_Del(self.pyHandle);
Runtime.Decref(self.tpHandle);
self.gcHandle.Free();
}
}
}