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pythonnet/src/runtime/methodbinding.cs at master · HenrywooChem/pythonnet · GitHub
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methodbinding.cs
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using
System
;
using
System
.
Collections
.
Generic
;
using
System
.
Reflection
;
namespace
Python
.
Runtime
{
/// <summary>
/// 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.
/// </summary>
internal
class
MethodBinding
:
ExtensionType
{
internal
MethodInfo
info
;
internal
MethodObject
m
;
internal
IntPtr
target
;
internal
IntPtr
targetType
;
public
MethodBinding
(
MethodObject
m
,
IntPtr
target
,
IntPtr
targetType
)
{
Runtime
.
XIncref
(
target
)
;
this
.
target
=
target
;
Runtime
.
XIncref
(
targetType
)
;
if
(
targetType
==
IntPtr
.
Zero
)
{
targetType
=
Runtime
.
PyObject_Type
(
target
)
;
}
this
.
targetType
=
targetType
;
this
.
info
=
null
;
this
.
m
=
m
;
}
public
MethodBinding
(
MethodObject
m
,
IntPtr
target
)
:
this
(
m
,
target
,
IntPtr
.
Zero
)
{
}
/// <summary>
/// Implement binding of generic methods using the subscript syntax [].
/// </summary>
public
static
IntPtr
mp_subscript
(
IntPtr
tp
,
IntPtr
idx
)
{
var
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
)
{
return
Exceptions
.
RaiseTypeError
(
"No match found for given type params"
)
;
}
var
mb
=
new
MethodBinding
(
self
.
m
,
self
.
target
)
{
info
=
mi
}
;
return
mb
.
pyHandle
;
}
/// <summary>
/// MethodBinding __getattribute__ implementation.
/// </summary>
public
static
IntPtr
tp_getattro
(
IntPtr
ob
,
IntPtr
key
)
{
var
self
=
(
MethodBinding
)
GetManagedObject
(
ob
)
;
if
(
!
Runtime
.
PyString_Check
(
key
)
)
{
Exceptions
.
SetError
(
Exceptions
.
TypeError
,
"string expected"
)
;
return
IntPtr
.
Zero
;
}
string
name
=
Runtime
.
GetManagedString
(
key
)
;
switch
(
name
)
{
case
"__doc__"
:
IntPtr
doc
=
self
.
m
.
GetDocString
(
)
;
Runtime
.
XIncref
(
doc
)
;
return
doc
;
// FIXME: deprecate __overloads__ soon...
case
"__overloads__"
:
case
"Overloads"
:
var
om
=
new
OverloadMapper
(
self
.
m
,
self
.
target
)
;
return
om
.
pyHandle
;
default
:
return
Runtime
.
PyObject_GenericGetAttr
(
ob
,
key
)
;
}
}
/// <summary>
/// MethodBinding __call__ implementation.
/// </summary>
public
static
IntPtr
tp_call
(
IntPtr
ob
,
IntPtr
args
,
IntPtr
kw
)
{
var
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
)
{
var
len
=
Runtime
.
PyTuple_Size
(
args
)
;
//FIXME: Never used
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.
var
disposeList
=
new
List
<
IntPtr
>
(
)
;
try
{
IntPtr
target
=
self
.
target
;
if
(
target
==
IntPtr
.
Zero
&&
!
self
.
m
.
IsStatic
(
)
)
{
var
len
=
Runtime
.
PyTuple_Size
(
args
)
;
if
(
len
<
1
)
{
Exceptions
.
SetError
(
Exceptions
.
TypeError
,
"not enough arguments"
)
;
return
IntPtr
.
Zero
;
}
target
=
Runtime
.
PyTuple_GetItem
(
args
,
0
)
;
Runtime
.
XIncref
(
target
)
;
disposeList
.
Add
(
target
)
;
args
=
Runtime
.
PyTuple_GetSlice
(
args
,
1
,
len
)
;
disposeList
.
Add
(
args
)
;
}
// if the class is a IPythonDerivedClass and target is not the same as self.targetType
// (eg if calling the base class method) then call the original base class method instead
// of the target method.
IntPtr
superType
=
IntPtr
.
Zero
;
if
(
Runtime
.
PyObject_TYPE
(
target
)
!=
self
.
targetType
)
{
var
inst
=
GetManagedObject
(
target
)
as
CLRObject
;
if
(
inst
?
.
inst
is
IPythonDerivedType
)
{
var
baseType
=
GetManagedObject
(
self
.
targetType
)
as
ClassBase
;
if
(
baseType
!=
null
)
{
string
baseMethodName
=
"_"
+
baseType
.
type
.
Name
+
"__"
+
self
.
m
.
name
;
IntPtr
baseMethod
=
Runtime
.
PyObject_GetAttrString
(
target
,
baseMethodName
)
;
if
(
baseMethod
!=
IntPtr
.
Zero
)
{
var
baseSelf
=
GetManagedObject
(
baseMethod
)
as
MethodBinding
;
if
(
baseSelf
!=
null
)
{
self
=
baseSelf
;
}
Runtime
.
XDecref
(
baseMethod
)
;
}
else
{
Runtime
.
PyErr_Clear
(
)
;
}
}
}
}
return
self
.
m
.
Invoke
(
target
,
args
,
kw
,
self
.
info
)
;
}
finally
{
foreach
(
IntPtr
ptr
in
disposeList
)
{
Runtime
.
XDecref
(
ptr
)
;
}
}
}
/// <summary>
/// MethodBinding __hash__ implementation.
/// </summary>
public
static
IntPtr
tp_hash
(
IntPtr
ob
)
{
var
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
)
;
}
/// <summary>
/// MethodBinding __repr__ implementation.
/// </summary>
public
static
IntPtr
tp_repr
(
IntPtr
ob
)
{
var
self
=
(
MethodBinding
)
GetManagedObject
(
ob
)
;
string
type
=
self
.
target
==
IntPtr
.
Zero
?
"unbound"
:
"bound"
;
string
name
=
self
.
m
.
name
;
return
Runtime
.
PyString_FromString
(
$
"<
{
type
}
method '
{
name
}
'>"
)
;
}
/// <summary>
/// MethodBinding dealloc implementation.
/// </summary>
public
new
static
void
tp_dealloc
(
IntPtr
ob
)
{
var
self
=
(
MethodBinding
)
GetManagedObject
(
ob
)
;
Runtime
.
XDecref
(
self
.
target
)
;
Runtime
.
XDecref
(
self
.
targetType
)
;
FinalizeObject
(
self
)
;
}
}
}
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