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pythonnet/src/runtime/classbase.cs at develop · achernet/pythonnet · GitHub
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runtime
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classbase.cs
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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
(
)
;
}
}
}
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