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pythonnet/src/runtime/Codecs/TupleCodecs.cs at master · saroad2/pythonnet · GitHub
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Codecs
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TupleCodecs.cs
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pythonnet
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runtime
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Codecs
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TupleCodecs.cs
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namespace
Python
.
Runtime
.
Codecs
{
using
System
;
using
System
.
Collections
.
Generic
;
using
System
.
Linq
;
using
System
.
Reflection
;
public
sealed
class
TupleCodec
<
TTuple
>
:
IPyObjectEncoder
,
IPyObjectDecoder
{
TupleCodec
(
)
{
}
public
static
TupleCodec
<
TTuple
>
Instance
{
get
;
}
=
new
TupleCodec
<
TTuple
>
(
)
;
public
bool
CanEncode
(
Type
type
)
{
if
(
type
==
typeof
(
object
)
||
type
==
typeof
(
TTuple
)
)
return
true
;
return
type
.
Namespace
==
typeof
(
TTuple
)
.
Namespace
// generic versions of tuples are named Tuple`TYPE_ARG_COUNT
&&
type
.
Name
.
StartsWith
(
typeof
(
TTuple
)
.
Name
+
'`'
)
;
}
public
PyObject
TryEncode
(
object
value
)
{
if
(
value
==
null
)
return
null
;
var
tupleType
=
value
.
GetType
(
)
;
if
(
tupleType
==
typeof
(
object
)
)
return
null
;
if
(
!
this
.
CanEncode
(
tupleType
)
)
return
null
;
if
(
tupleType
==
typeof
(
TTuple
)
)
return
new
PyTuple
(
)
;
long
fieldCount
=
tupleType
.
GetGenericArguments
(
)
.
Length
;
var
tuple
=
Runtime
.
PyTuple_New
(
fieldCount
)
;
Exceptions
.
ErrorCheck
(
tuple
)
;
int
fieldIndex
=
0
;
foreach
(
FieldInfo
field
in
tupleType
.
GetFields
(
)
)
{
var
item
=
field
.
GetValue
(
value
)
;
IntPtr
pyItem
=
Converter
.
ToPython
(
item
)
;
Runtime
.
PyTuple_SetItem
(
tuple
,
fieldIndex
,
pyItem
)
;
fieldIndex
++
;
}
return
new
PyTuple
(
tuple
)
;
}
public
bool
CanDecode
(
PyObject
objectType
,
Type
targetType
)
=>
objectType
.
Handle
==
Runtime
.
PyTupleType
&&
this
.
CanEncode
(
targetType
)
;
public
bool
TryDecode
<
T
>
(
PyObject
pyObj
,
out
T
value
)
{
if
(
pyObj
==
null
)
throw
new
ArgumentNullException
(
nameof
(
pyObj
)
)
;
value
=
default
;
if
(
!
Runtime
.
PyTuple_Check
(
pyObj
.
Handle
)
)
return
false
;
if
(
typeof
(
T
)
==
typeof
(
object
)
)
{
bool
converted
=
Decode
(
pyObj
,
out
object
result
)
;
if
(
converted
)
{
value
=
(
T
)
result
;
return
true
;
}
return
false
;
}
var
itemTypes
=
typeof
(
T
)
.
GetGenericArguments
(
)
;
long
itemCount
=
Runtime
.
PyTuple_Size
(
pyObj
.
Handle
)
;
if
(
itemTypes
.
Length
!=
itemCount
)
return
false
;
if
(
itemCount
==
0
)
{
value
=
(
T
)
EmptyTuple
;
return
true
;
}
var
elements
=
new
object
[
itemCount
]
;
for
(
int
itemIndex
=
0
;
itemIndex
<
itemTypes
.
Length
;
itemIndex
++
)
{
IntPtr
pyItem
=
Runtime
.
PyTuple_GetItem
(
pyObj
.
Handle
,
itemIndex
)
;
if
(
!
Converter
.
ToManaged
(
pyItem
,
itemTypes
[
itemIndex
]
,
out
elements
[
itemIndex
]
,
setError
:
false
)
)
{
Exceptions
.
Clear
(
)
;
return
false
;
}
}
var
factory
=
tupleCreate
[
itemCount
]
.
MakeGenericMethod
(
itemTypes
)
;
value
=
(
T
)
factory
.
Invoke
(
null
,
elements
)
;
return
true
;
}
static
bool
Decode
(
PyObject
tuple
,
out
object
value
)
{
long
itemCount
=
Runtime
.
PyTuple_Size
(
tuple
.
Handle
)
;
if
(
itemCount
==
0
)
{
value
=
EmptyTuple
;
return
true
;
}
var
elements
=
new
object
[
itemCount
]
;
var
itemTypes
=
new
Type
[
itemCount
]
;
value
=
null
;
for
(
int
itemIndex
=
0
;
itemIndex
<
elements
.
Length
;
itemIndex
++
)
{
var
pyItem
=
Runtime
.
PyTuple_GetItem
(
tuple
.
Handle
,
itemIndex
)
;
if
(
!
Converter
.
ToManaged
(
pyItem
,
typeof
(
object
)
,
out
elements
[
itemIndex
]
,
setError
:
false
)
)
{
Exceptions
.
Clear
(
)
;
return
false
;
}
itemTypes
[
itemIndex
]
=
elements
[
itemIndex
]
?
.
GetType
(
)
??
typeof
(
object
)
;
}
var
factory
=
tupleCreate
[
itemCount
]
.
MakeGenericMethod
(
itemTypes
)
;
value
=
factory
.
Invoke
(
null
,
elements
)
;
return
true
;
}
static
readonly
MethodInfo
[
]
tupleCreate
=
typeof
(
TTuple
)
.
GetMethods
(
BindingFlags
.
Public
|
BindingFlags
.
Static
)
.
Where
(
m
=>
m
.
Name
==
nameof
(
Tuple
.
Create
)
)
.
OrderBy
(
m
=>
m
.
GetParameters
(
)
.
Length
)
.
ToArray
(
)
;
static
readonly
object
EmptyTuple
=
tupleCreate
[
0
]
.
Invoke
(
null
,
parameters
:
new
object
[
0
]
)
;
public
static
void
Register
(
)
{
PyObjectConversions
.
RegisterEncoder
(
Instance
)
;
PyObjectConversions
.
RegisterDecoder
(
Instance
)
;
}
}
}
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