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pythonnet/pythonnet/src/runtime/methodbinding.cs at develop · davidanthoff/pythonnet · GitHub
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methodbinding.cs
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runtime
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methodbinding.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
.
Reflection
;
namespace
Python
.
Runtime
{
//========================================================================
// Implements a Python binding type for CLR methods. These work much like
// standard Python method bindings, but the same type is used to bind
// both static and instance methods.
//========================================================================
internal
class
MethodBinding
:
ExtensionType
{
internal
MethodInfo
info
;
internal
MethodObject
m
;
internal
IntPtr
target
;
public
MethodBinding
(
MethodObject
m
,
IntPtr
target
)
:
base
(
)
{
Runtime
.
Incref
(
target
)
;
this
.
target
=
target
;
this
.
info
=
null
;
this
.
m
=
m
;
}
//====================================================================
// Implement binding of generic methods using the subscript syntax [].
//====================================================================
public
static
IntPtr
mp_subscript
(
IntPtr
tp
,
IntPtr
idx
)
{
MethodBinding
self
=
(
MethodBinding
)
GetManagedObject
(
tp
)
;
Type
[
]
types
=
Runtime
.
PythonArgsToTypeArray
(
idx
)
;
if
(
types
==
null
)
{
return
Exceptions
.
RaiseTypeError
(
"type(s) expected"
)
;
}
MethodInfo
mi
=
MethodBinder
.
MatchParameters
(
self
.
m
.
info
,
types
)
;
if
(
mi
==
null
)
{
string
e
=
"No match found for given type params"
;
return
Exceptions
.
RaiseTypeError
(
e
)
;
}
MethodBinding
mb
=
new
MethodBinding
(
self
.
m
,
self
.
target
)
;
mb
.
info
=
mi
;
Runtime
.
Incref
(
mb
.
pyHandle
)
;
return
mb
.
pyHandle
;
}
//====================================================================
// MethodBinding __getattribute__ implementation.
//====================================================================
public
static
IntPtr
tp_getattro
(
IntPtr
ob
,
IntPtr
key
)
{
MethodBinding
self
=
(
MethodBinding
)
GetManagedObject
(
ob
)
;
if
(
!
Runtime
.
PyString_Check
(
key
)
)
{
Exceptions
.
SetError
(
Exceptions
.
TypeError
,
"string expected"
)
;
return
IntPtr
.
Zero
;
}
string
name
=
Runtime
.
GetManagedString
(
key
)
;
if
(
name
==
"__doc__"
)
{
IntPtr
doc
=
self
.
m
.
GetDocString
(
)
;
Runtime
.
Incref
(
doc
)
;
return
doc
;
}
// XXX deprecate __overloads__ soon...
if
(
name
==
"__overloads__"
||
name
==
"Overloads"
)
{
OverloadMapper
om
=
new
OverloadMapper
(
self
.
m
,
self
.
target
)
;
Runtime
.
Incref
(
om
.
pyHandle
)
;
return
om
.
pyHandle
;
}
return
Runtime
.
PyObject_GenericGetAttr
(
ob
,
key
)
;
}
//====================================================================
// MethodBinding __call__ implementation.
//====================================================================
public
static
IntPtr
tp_call
(
IntPtr
ob
,
IntPtr
args
,
IntPtr
kw
)
{
MethodBinding
self
=
(
MethodBinding
)
GetManagedObject
(
ob
)
;
// This works around a situation where the wrong generic method is picked,
// for example this method in the tests: string Overloaded<T>(int arg1, int arg2, string arg3)
if
(
self
.
info
!=
null
)
{
if
(
self
.
info
.
IsGenericMethod
)
{
int
len
=
Runtime
.
PyTuple_Size
(
args
)
;
Type
[
]
sigTp
=
Runtime
.
PythonArgsToTypeArray
(
args
,
true
)
;
if
(
sigTp
!=
null
)
{
Type
[
]
genericTp
=
self
.
info
.
GetGenericArguments
(
)
;
MethodInfo
betterMatch
=
MethodBinder
.
MatchSignatureAndParameters
(
self
.
m
.
info
,
genericTp
,
sigTp
)
;
if
(
betterMatch
!=
null
)
self
.
info
=
betterMatch
;
}
}
}
// This supports calling a method 'unbound', passing the instance
// as the first argument. Note that this is not supported if any
// of the overloads are static since we can't know if the intent
// was to call the static method or the unbound instance method.
if
(
(
self
.
target
==
IntPtr
.
Zero
)
&&
(
!
self
.
m
.
IsStatic
(
)
)
)
{
int
len
=
Runtime
.
PyTuple_Size
(
args
)
;
if
(
len
<
1
)
{
Exceptions
.
SetError
(
Exceptions
.
TypeError
,
"not enough arguments"
)
;
return
IntPtr
.
Zero
;
}
IntPtr
uargs
=
Runtime
.
PyTuple_GetSlice
(
args
,
1
,
len
)
;
IntPtr
inst
=
Runtime
.
PyTuple_GetItem
(
args
,
0
)
;
Runtime
.
Incref
(
inst
)
;
IntPtr
r
=
self
.
m
.
Invoke
(
inst
,
uargs
,
kw
,
self
.
info
)
;
Runtime
.
Decref
(
inst
)
;
Runtime
.
Decref
(
uargs
)
;
return
r
;
}
return
self
.
m
.
Invoke
(
self
.
target
,
args
,
kw
,
self
.
info
)
;
}
//====================================================================
// MethodBinding __hash__ implementation.
//====================================================================
public
static
IntPtr
tp_hash
(
IntPtr
ob
)
{
MethodBinding
self
=
(
MethodBinding
)
GetManagedObject
(
ob
)
;
long
x
=
0
;
long
y
=
0
;
if
(
self
.
target
!=
IntPtr
.
Zero
)
{
x
=
Runtime
.
PyObject_Hash
(
self
.
target
)
.
ToInt64
(
)
;
if
(
x
==
-
1
)
{
return
new
IntPtr
(
-
1
)
;
}
}
y
=
Runtime
.
PyObject_Hash
(
self
.
m
.
pyHandle
)
.
ToInt64
(
)
;
if
(
y
==
-
1
)
{
return
new
IntPtr
(
-
1
)
;
}
x
^=
y
;
if
(
x
==
-
1
)
{
x
=
-
1
;
}
return
new
IntPtr
(
x
)
;
}
//====================================================================
// MethodBinding __repr__ implementation.
//====================================================================
public
static
IntPtr
tp_repr
(
IntPtr
ob
)
{
MethodBinding
self
=
(
MethodBinding
)
GetManagedObject
(
ob
)
;
string
type
=
(
self
.
target
==
IntPtr
.
Zero
)
?
"unbound"
:
"bound"
;
string
s
=
String
.
Format
(
"<{0} method '{1}'>"
,
type
,
self
.
m
.
name
)
;
return
Runtime
.
PyString_FromStringAndSize
(
s
,
s
.
Length
)
;
}
//====================================================================
// MethodBinding dealloc implementation.
//====================================================================
public
static
new
void
tp_dealloc
(
IntPtr
ob
)
{
MethodBinding
self
=
(
MethodBinding
)
GetManagedObject
(
ob
)
;
Runtime
.
Decref
(
self
.
target
)
;
ExtensionType
.
FinalizeObject
(
self
)
;
}
}
}
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