pythonnet/src/runtime/classbase.cs at v2.5.1 · pythonnet/pythonnet · GitHub

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using System;

using System.Collections;

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)

{

indexer = null;

type = tp;

}

internal virtual bool CanSubclass()

{

return !type.IsEnum;

}

/// <summary>

/// Implements __init__ for reflected classes and value types.

/// </summary>

public static int tp_init(IntPtr ob, IntPtr args, IntPtr kw)

{

return 0;

}

/// <summary>

/// Default implementation of [] semantics for reflected types.

/// </summary>

public virtual IntPtr type_subscript(IntPtr idx)

{

Type[] types = Runtime.PythonArgsToTypeArray(idx);

if (types == null)

{

return Exceptions.RaiseTypeError("type(s) expected");

}

Type target = GenericUtil.GenericForType(type, types.Length);

if (target != null)

{

Type t = target.MakeGenericType(types);

ManagedType c = ClassManager.GetClass(t);

Runtime.XIncref(c.pyHandle);

return c.pyHandle;

}

return Exceptions.RaiseTypeError("no type matches params");

}

/// <summary>

/// Standard comparison implementation for instances of reflected types.

/// </summary>

public static IntPtr tp_richcompare(IntPtr ob, IntPtr other, int op)

{

CLRObject co1;

CLRObject co2;

switch (op)

{

case Runtime.Py_EQ:

case Runtime.Py_NE:

IntPtr pytrue = Runtime.PyTrue;

IntPtr pyfalse = Runtime.PyFalse;

// swap true and false for NE

if (op != Runtime.Py_EQ)

{

pytrue = Runtime.PyFalse;

pyfalse = Runtime.PyTrue;

}

if (ob == other)

{

Runtime.XIncref(pytrue);

return pytrue;

}

co1 = GetManagedObject(ob) as CLRObject;

co2 = GetManagedObject(other) as CLRObject;

if (null == co2)

{

Runtime.XIncref(pyfalse);

return pyfalse;

}

object o1 = co1.inst;

object o2 = co2.inst;

if (Equals(o1, o2))

{

Runtime.XIncref(pytrue);

return pytrue;

}

Runtime.XIncref(pyfalse);

return pyfalse;

case Runtime.Py_LT:

case Runtime.Py_LE:

case Runtime.Py_GT:

case Runtime.Py_GE:

co1 = GetManagedObject(ob) as CLRObject;

co2 = GetManagedObject(other) as CLRObject;

if (co1 == null || co2 == null)

{

return Exceptions.RaiseTypeError("Cannot get managed object");

}

var co1Comp = co1.inst as IComparable;

if (co1Comp == null)

{

Type co1Type = co1.GetType();

return Exceptions.RaiseTypeError($"Cannot convert object of type {co1Type} to IComparable");

}

try

{

int cmp = co1Comp.CompareTo(co2.inst);

IntPtr pyCmp;

if (cmp < 0)

{

if (op == Runtime.Py_LT || op == Runtime.Py_LE)

{

pyCmp = Runtime.PyTrue;

}

else

{

pyCmp = Runtime.PyFalse;

}

else if (cmp == 0)

{

if (op == Runtime.Py_LE || op == Runtime.Py_GE)

{

pyCmp = Runtime.PyTrue;

}

else

{

pyCmp = Runtime.PyFalse;

}

else

{

if (op == Runtime.Py_GE || op == Runtime.Py_GT)

{

pyCmp = Runtime.PyTrue;

}

else

{

pyCmp = Runtime.PyFalse;

}

Runtime.XIncref(pyCmp);

return pyCmp;

}

catch (ArgumentException e)

{

return Exceptions.RaiseTypeError(e.Message);

}

default:

Runtime.XIncref(Runtime.PyNotImplemented);

return Runtime.PyNotImplemented;

}

/// <summary>

/// Standard iteration support for instances of reflected types. This

/// allows natural iteration over objects that either are IEnumerable

/// or themselves support IEnumerator directly.

/// </summary>

public static IntPtr tp_iter(IntPtr ob)

{

var co = GetManagedObject(ob) as CLRObject;

if (co == null)

{

return Exceptions.RaiseTypeError("invalid object");

}

var e = co.inst as IEnumerable;

IEnumerator o;

if (e != null)

{

o = e.GetEnumerator();

}

else

{

o = co.inst as IEnumerator;

if (o == null)

{

return Exceptions.RaiseTypeError("iteration over non-sequence");

}

return new Iterator(o).pyHandle;

}

/// <summary>

/// Standard __hash__ implementation for instances of reflected types.

/// </summary>

public static IntPtr tp_hash(IntPtr ob)

{

var co = GetManagedObject(ob) as CLRObject;

if (co == null)

{

return Exceptions.RaiseTypeError("unhashable type");

}

return new IntPtr(co.inst.GetHashCode());

}

/// <summary>

/// Standard __str__ implementation for instances of reflected types.

/// </summary>

public static IntPtr tp_str(IntPtr ob)

{

var co = GetManagedObject(ob) as CLRObject;

if (co == null)

{

return Exceptions.RaiseTypeError("invalid object");

}

try

{

return Runtime.PyString_FromString(co.inst.ToString());

}

catch (Exception e)

{

if (e.InnerException != null)

{

e = e.InnerException;

}

Exceptions.SetError(e);

return IntPtr.Zero;

}

public static IntPtr tp_repr(IntPtr ob)

{

var co = GetManagedObject(ob) as CLRObject;

if (co == null)

{

return Exceptions.RaiseTypeError("invalid object");

}

try

{

//if __repr__ is defined, use it

var instType = co.inst.GetType();

System.Reflection.MethodInfo methodInfo = instType.GetMethod("__repr__");

if (methodInfo != null && methodInfo.IsPublic)

{

var reprString = methodInfo.Invoke(co.inst, null) as string;

return Runtime.PyString_FromString(reprString);

}

//otherwise use the standard object.__repr__(inst)

IntPtr args = Runtime.PyTuple_New(1);

Runtime.XIncref(ob);

Runtime.PyTuple_SetItem(args, 0, ob);

IntPtr reprFunc = Runtime.PyObject_GetAttrString(Runtime.PyBaseObjectType, "__repr__");

var output = Runtime.PyObject_Call(reprFunc, args, IntPtr.Zero);

Runtime.XDecref(args);

Runtime.XDecref(reprFunc);

return output;

}

catch (Exception e)

{

if (e.InnerException != null)

{

e = e.InnerException;

}

Exceptions.SetError(e);

return IntPtr.Zero;

}

/// <summary>

/// Standard dealloc implementation for instances of reflected types.

/// </summary>

public static void tp_dealloc(IntPtr ob)

{

ManagedType self = GetManagedObject(ob);

IntPtr dict = Marshal.ReadIntPtr(ob, ObjectOffset.TypeDictOffset(self.tpHandle));

if (dict != IntPtr.Zero)

{

Runtime.XDecref(dict);

}

Runtime.PyObject_GC_UnTrack(self.pyHandle);

Runtime.PyObject_GC_Del(self.pyHandle);

Runtime.XDecref(self.tpHandle);

self.gcHandle.Free();

}

pythonnet/src/runtime/classbase.cs at v2.5.1 · pythonnet/pythonnet · GitHub

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