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pythonnet/src/runtime/PythonTypes/PyIter.cs at master · generalloki/pythonnet · GitHub
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runtime
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PythonTypes
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PyIter.cs
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pythonnet
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src
/
runtime
/
PythonTypes
/
PyIter.cs
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using
System
;
using
System
.
Collections
.
Generic
;
using
System
.
Runtime
.
Serialization
;
namespace
Python
.
Runtime
{
/// <summary>
/// Represents a standard Python iterator object. See the documentation at
/// PY2: https://docs.python.org/2/c-api/iterator.html
/// PY3: https://docs.python.org/3/c-api/iterator.html
/// for details.
/// </summary>
public
class
PyIter
:
PyObject
,
IEnumerator
<
PyObject
>
{
private
PyObject
?
_current
;
/// <summary>
/// PyIter Constructor
/// </summary>
/// <remarks>
/// Creates a new PyIter from an existing iterator reference. Note
/// that the instance assumes ownership of the object reference.
/// The object reference is not checked for type-correctness.
/// </remarks>
internal
PyIter
(
in
StolenReference
reference
)
:
base
(
reference
)
{
}
/// <summary>
/// Creates new <see cref="PyIter"/> from an untyped reference to Python object.
/// The object must support iterator protocol.
/// </summary>
public
PyIter
(
PyObject
pyObject
)
:
base
(
FromPyObject
(
pyObject
)
)
{
}
static
BorrowedReference
FromPyObject
(
PyObject
pyObject
)
{
if
(
pyObject
is
null
)
throw
new
ArgumentNullException
(
nameof
(
pyObject
)
)
;
if
(
!
Runtime
.
PyIter_Check
(
pyObject
.
Reference
)
)
throw
new
ArgumentException
(
"Object does not support iterator protocol"
)
;
return
pyObject
.
Reference
;
}
internal
PyIter
(
BorrowedReference
reference
)
:
base
(
reference
)
{
}
/// <summary>
/// Create a new <see cref="PyIter"/> from a given iterable.
///
/// Like doing "iter(<paramref name="iterable"/>)" in Python.
/// </summary>
public
static
PyIter
GetIter
(
PyObject
iterable
)
{
if
(
iterable
==
null
)
{
throw
new
ArgumentNullException
(
)
;
}
var
val
=
Runtime
.
PyObject_GetIter
(
iterable
.
Reference
)
;
PythonException
.
ThrowIfIsNull
(
val
)
;
return
new
PyIter
(
val
.
Steal
(
)
)
;
}
protected
override
void
Dispose
(
bool
disposing
)
{
_current
=
null
;
base
.
Dispose
(
disposing
)
;
}
public
bool
MoveNext
(
)
{
NewReference
next
=
Runtime
.
PyIter_Next
(
Reference
)
;
if
(
next
.
IsNull
(
)
)
{
if
(
Exceptions
.
ErrorOccurred
(
)
)
{
throw
PythonException
.
ThrowLastAsClrException
(
)
;
}
// stop holding the previous object, if there was one
_current
=
null
;
return
false
;
}
_current
=
next
.
MoveToPyObject
(
)
;
return
true
;
}
public
void
Reset
(
)
{
throw
new
NotSupportedException
(
)
;
}
public
PyObject
Current
=>
_current
??
throw
new
InvalidOperationException
(
)
;
object
System
.
Collections
.
IEnumerator
.
Current
=>
Current
;
protected
PyIter
(
SerializationInfo
info
,
StreamingContext
context
)
:
base
(
info
,
context
)
{
_current
=
(
PyObject
?
)
info
.
GetValue
(
"c"
,
typeof
(
PyObject
)
)
;
}
protected
override
void
GetObjectData
(
SerializationInfo
info
,
StreamingContext
context
)
{
base
.
GetObjectData
(
info
,
context
)
;
info
.
AddValue
(
"c"
,
_current
)
;
}
}
}
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