pythonnet/src/runtime/classbase.cs at master · sdpython/pythonnet · GitHub

This repository was archived by the owner on Jul 22, 2023. It is now read-only.

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using System;

using System.Collections;

using System.Collections.Generic;

using System.Diagnostics;

using System.Runtime.InteropServices;

using System.Runtime.Serialization;

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>

[Serializable]

internal class ClassBase : ManagedType

{

[NonSerialized]

internal List<string> dotNetMembers;

internal Indexer indexer;

internal Dictionary<int, MethodObject> richcompare;

internal MaybeType type;

internal ClassBase(Type tp)

{

dotNetMembers = new List<string>();

indexer = null;

type = tp;

}

internal virtual bool CanSubclass()

{

return !type.Value.IsEnum;

}

public readonly static Dictionary<string, int> CilToPyOpMap = new Dictionary<string, int>

{

["op_Equality"] = Runtime.Py_EQ,

["op_Inequality"] = Runtime.Py_NE,

["op_LessThanOrEqual"] = Runtime.Py_LE,

["op_GreaterThanOrEqual"] = Runtime.Py_GE,

["op_LessThan"] = Runtime.Py_LT,

["op_GreaterThan"] = Runtime.Py_GT,

};

/// <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");

}

if (!type.Valid)

{

return Exceptions.RaiseTypeError(type.DeletedMessage);

}

Type target = GenericUtil.GenericForType(type.Value, 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($"{type.Value.Namespace}.{type.Name} does not accept {types.Length} generic parameters");

}

/// <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;

IntPtr tp = Runtime.PyObject_TYPE(ob);

var cls = (ClassBase)GetManagedObject(tp);

// C# operator methods take precedence over IComparable.

// We first check if there's a comparison operator by looking up the richcompare table,

// otherwise fallback to checking if an IComparable interface is handled.

if (cls.richcompare.TryGetValue(op, out var methodObject))

{

// Wrap the `other` argument of a binary comparison operator in a PyTuple.

IntPtr args = Runtime.PyTuple_New(1);

Runtime.XIncref(other);

Runtime.PyTuple_SetItem(args, 0, other);

IntPtr value;

try

{

value = methodObject.Invoke(ob, args, IntPtr.Zero);

}

finally

{

Runtime.XDecref(args); // Free args pytuple

}

return value;

}

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");

}

var elemType = typeof(object);

var iterType = co.inst.GetType();

foreach(var ifc in iterType.GetInterfaces())

{

if (ifc.IsGenericType)

{

var genTypeDef = ifc.GetGenericTypeDefinition();

if (genTypeDef == typeof(IEnumerable<>) || genTypeDef == typeof(IEnumerator<>))

{

elemType = ifc.GetGenericArguments()[0];

break;

}

return new Iterator(o, elemType).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_GetAttr(Runtime.PyBaseObjectType, PyIdentifier.__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);

tp_clear(ob);

Runtime.PyObject_GC_UnTrack(self.pyHandle);

Runtime.PyObject_GC_Del(self.pyHandle);

self.FreeGCHandle();

}

public static int tp_clear(IntPtr ob)

{

ManagedType self = GetManagedObject(ob);

if (!self.IsTypeObject())

{

ClearObjectDict(ob);

}

self.tpHandle = IntPtr.Zero;

return 0;

}

protected override void OnSave(InterDomainContext context)

{

base.OnSave(context);

if (pyHandle != tpHandle)

{

IntPtr dict = GetObjectDict(pyHandle);

Runtime.XIncref(dict);

context.Storage.AddValue("dict", dict);

}

protected override void OnLoad(InterDomainContext context)

{

base.OnLoad(context);

if (pyHandle != tpHandle)

{

IntPtr dict = context.Storage.GetValue<IntPtr>("dict");

SetObjectDict(pyHandle, dict);

}

gcHandle = AllocGCHandle();

Marshal.WriteIntPtr(pyHandle, TypeOffset.magic(), (IntPtr)gcHandle);

}

/// <summary>

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

/// </summary>

public static IntPtr mp_subscript(IntPtr ob, IntPtr idx)

{

IntPtr tp = Runtime.PyObject_TYPE(ob);

var cls = (ClassBase)GetManagedObject(tp);

if (cls.indexer == null || !cls.indexer.CanGet)

{

Exceptions.SetError(Exceptions.TypeError, "unindexable object");

return IntPtr.Zero;

}

// Arg may be a tuple in the case of an indexer with multiple

// parameters. If so, use it directly, else make a new tuple

// with the index arg (method binders expect arg tuples).

IntPtr args = idx;

var free = false;

if (!Runtime.PyTuple_Check(idx))

{

args = Runtime.PyTuple_New(1);

Runtime.XIncref(idx);

Runtime.PyTuple_SetItem(args, 0, idx);

free = true;

}

IntPtr value;

try

{

value = cls.indexer.GetItem(ob, args);

}

finally

{

if (free)

{

Runtime.XDecref(args);

}

return value;

}

/// <summary>

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

/// </summary>

public static int mp_ass_subscript(IntPtr ob, IntPtr idx, IntPtr v)

{

IntPtr tp = Runtime.PyObject_TYPE(ob);

var cls = (ClassBase)GetManagedObject(tp);

if (cls.indexer == null || !cls.indexer.CanSet)

{

Exceptions.SetError(Exceptions.TypeError, "object doesn't support item assignment");

return -1;

}

// Arg may be a tuple in the case of an indexer with multiple

// parameters. If so, use it directly, else make a new tuple

// with the index arg (method binders expect arg tuples).

IntPtr args = idx;

var free = false;

if (!Runtime.PyTuple_Check(idx))

{

args = Runtime.PyTuple_New(1);

Runtime.XIncref(idx);

Runtime.PyTuple_SetItem(args, 0, idx);

free = true;

}

// Get the args passed in.

var i = Runtime.PyTuple_Size(args);

IntPtr defaultArgs = cls.indexer.GetDefaultArgs(args);

var numOfDefaultArgs = Runtime.PyTuple_Size(defaultArgs);

var temp = i + numOfDefaultArgs;

IntPtr real = Runtime.PyTuple_New(temp + 1);

for (var n = 0; n < i; n++)

{

IntPtr item = Runtime.PyTuple_GetItem(args, n);

Runtime.XIncref(item);

Runtime.PyTuple_SetItem(real, n, item);

}

// Add Default Args if needed

for (var n = 0; n < numOfDefaultArgs; n++)

{

IntPtr item = Runtime.PyTuple_GetItem(defaultArgs, n);

Runtime.XIncref(item);

Runtime.PyTuple_SetItem(real, n + i, item);

}

// no longer need defaultArgs

Runtime.XDecref(defaultArgs);

i = temp;

// Add value to argument list

Runtime.XIncref(v);

Runtime.PyTuple_SetItem(real, i, v);

try

{

cls.indexer.SetItem(ob, real);

}

finally

{

Runtime.XDecref(real);

if (free)

{

Runtime.XDecref(args);

}

if (Exceptions.ErrorOccurred())

{

return -1;

}

return 0;

}

pythonnet/src/runtime/classbase.cs at master · sdpython/pythonnet · GitHub

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