pythonnet/src/runtime/Types/ClassBase.cs at master · devtrack/pythonnet · GitHub

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using System;

using System.Collections;

using System.Collections.Generic;

using System.Diagnostics;

using System.Linq;

using System.Reflection;

using System.Runtime.InteropServices;

using System.Runtime.Serialization;

using Python.Runtime.Slots;

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, IDeserializationCallback

{

[NonSerialized]

internal List<string> dotNetMembers = new();

internal Indexer? indexer;

internal MethodBinder? del;

internal readonly Dictionary<int, MethodObject> richcompare = new();

internal MaybeType type;

internal ClassBase(Type tp)

{

if (tp is null) throw new ArgumentNullException(nameof(type));

indexer = null;

type = tp;

}

internal virtual bool CanSubclass()

{

return !type.Value.IsEnum;

}

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

{

["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 NewReference type_subscript(BorrowedReference 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;

try

{

// MakeGenericType can throw ArgumentException

t = target.MakeGenericType(types);

}

catch (ArgumentException e)

{

return Exceptions.RaiseTypeError(e.Message);

}

var c = ClassManager.GetClass(t);

return new NewReference(c);

}

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 NewReference tp_richcompare(BorrowedReference ob, BorrowedReference other, int op)

{

CLRObject co1;

CLRObject? co2;

BorrowedReference 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.

using var args = Runtime.PyTuple_New(1);

Runtime.PyTuple_SetItem(args.Borrow(), 0, other);

return methodObject.Invoke(ob, args.Borrow(), null);

}

switch (op)

{

case Runtime.Py_EQ:

case Runtime.Py_NE:

BorrowedReference pytrue = Runtime.PyTrue;

BorrowedReference pyfalse = Runtime.PyFalse;

// swap true and false for NE

if (op != Runtime.Py_EQ)

{

pytrue = Runtime.PyFalse;

pyfalse = Runtime.PyTrue;

}

if (ob == other)

{

return new NewReference(pytrue);

}

co1 = (CLRObject)GetManagedObject(ob)!;

co2 = GetManagedObject(other) as CLRObject;

if (null == co2)

{

return new NewReference(pyfalse);

}

object o1 = co1.inst;

object o2 = co2.inst;

if (Equals(o1, o2))

{

return new NewReference(pytrue);

}

return new NewReference(pyfalse);

case Runtime.Py_LT:

case Runtime.Py_LE:

case Runtime.Py_GT:

case Runtime.Py_GE:

co1 = (CLRObject)GetManagedObject(ob)!;

co2 = GetManagedObject(other) as CLRObject;

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

{

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

}

if (co1.inst is not IComparable co1Comp)

{

Type co1Type = co1.GetType();

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

}

try

{

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

BorrowedReference 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;

}

return new NewReference(pyCmp);

}

catch (ArgumentException e)

{

return Exceptions.RaiseTypeError(e.Message);

}

default:

return new NewReference(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>

static NewReference tp_iter_impl(BorrowedReference ob)

{

if (GetManagedObject(ob) is not CLRObject co)

{

return Exceptions.RaiseTypeError("invalid object");

}

IEnumerator? o;

if (co.inst is IEnumerable e)

{

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).Alloc();

}

/// <summary>

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

/// </summary>

public static nint tp_hash(BorrowedReference ob)

{

if (GetManagedObject(ob) is CLRObject co)

{

return co.inst.GetHashCode();

}

else

{

Exceptions.RaiseTypeError("unhashable type");

return 0;

}

/// <summary>

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

/// </summary>

public static NewReference tp_str(BorrowedReference 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 default;

}

public static NewReference tp_repr(BorrowedReference ob)

{

if (GetManagedObject(ob) is not CLRObject co)

{

return Exceptions.RaiseTypeError("invalid object");

}

try

{

//if __repr__ is defined, use it

var instType = co.inst.GetType();

var methodInfo = instType.GetMethod("__repr__");

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

{

if (methodInfo.Invoke(co.inst, null) is string reprString)

{

return Runtime.PyString_FromString(reprString);

}

else

{

return new NewReference(Runtime.PyNone);

}

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

using var args = Runtime.PyTuple_New(1);

Runtime.PyTuple_SetItem(args.Borrow(), 0, ob);

using var reprFunc = Runtime.PyObject_GetAttr(Runtime.PyBaseObjectType, PyIdentifier.__repr__);

return Runtime.PyObject_Call(reprFunc.Borrow(), args.Borrow(), null);

}

catch (Exception e)

{

if (e.InnerException != null)

{

e = e.InnerException;

}

Exceptions.SetError(e);

return default;

}

/// <summary>

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

/// </summary>

public static void tp_dealloc(NewReference lastRef)

{

Runtime.PyObject_GC_UnTrack(lastRef.Borrow());

CallClear(lastRef.Borrow());

DecrefTypeAndFree(lastRef.Steal());

}

public static int tp_clear(BorrowedReference ob)

{

var weakrefs = Runtime.PyObject_GetWeakRefList(ob);

if (weakrefs != null)

{

Runtime.PyObject_ClearWeakRefs(ob);

}

if (TryFreeGCHandle(ob))

{

IntPtr addr = ob.DangerousGetAddress();

bool deleted = CLRObject.reflectedObjects.Remove(addr);

Debug.Assert(deleted);

}

int baseClearResult = BaseUnmanagedClear(ob);

if (baseClearResult != 0)

{

return baseClearResult;

}

ClearObjectDict(ob);

return 0;

}

internal static unsafe int BaseUnmanagedClear(BorrowedReference ob)

{

var type = Runtime.PyObject_TYPE(ob);

var unmanagedBase = GetUnmanagedBaseType(type);

var clearPtr = Util.ReadIntPtr(unmanagedBase, TypeOffset.tp_clear);

if (clearPtr == IntPtr.Zero)

{

return 0;

}

var clear = (delegate* unmanaged[Cdecl]<BorrowedReference, int>)clearPtr;

bool usesSubtypeClear = clearPtr == TypeManager.subtype_clear;

if (usesSubtypeClear)

{

// workaround for https://bugs.python.org/issue45266 (subtype_clear)

using var dict = Runtime.PyObject_GenericGetDict(ob);

if (Runtime.PyMapping_HasKey(dict.Borrow(), PyIdentifier.__clear_reentry_guard__) != 0)

return 0;

int res = Runtime.PyDict_SetItem(dict.Borrow(), PyIdentifier.__clear_reentry_guard__, Runtime.None);

if (res != 0) return res;

res = clear(ob);

Runtime.PyDict_DelItem(dict.Borrow(), PyIdentifier.__clear_reentry_guard__);

return res;

}

return clear(ob);

}

protected override Dictionary<string, object?> OnSave(BorrowedReference ob)

{

var context = base.OnSave(ob) ?? new();

context["impl"] = this;

return context;

}

protected override void OnLoad(BorrowedReference ob, Dictionary<string, object?>? context)

{

base.OnLoad(ob, context);

var gcHandle = GCHandle.Alloc(this);

SetGCHandle(ob, gcHandle);

}

/// <summary>

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

/// </summary>

static NewReference mp_subscript_impl(BorrowedReference ob, BorrowedReference idx)

{

BorrowedReference tp = Runtime.PyObject_TYPE(ob);

var cls = (ClassBase)GetManagedObject(tp)!;

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

{

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

return default;

}

// 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).

if (!Runtime.PyTuple_Check(idx))

{

using var argTuple = Runtime.PyTuple_New(1);

Runtime.PyTuple_SetItem(argTuple.Borrow(), 0, idx);

return cls.indexer.GetItem(ob, argTuple.Borrow());

}

else

{

return cls.indexer.GetItem(ob, idx);

}

/// <summary>

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

/// </summary>

static int mp_ass_subscript_impl(BorrowedReference ob, BorrowedReference idx, BorrowedReference v)

{

BorrowedReference 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).

NewReference argsTuple = default;

if (v.IsNull)

{

return DelImpl(ob, idx, cls);

}

if (!Runtime.PyTuple_Check(idx))

{

argsTuple = Runtime.PyTuple_New(1);

Runtime.PyTuple_SetItem(argsTuple.Borrow(), 0, idx);

idx = argsTuple.Borrow();

}

// Get the args passed in.

var i = Runtime.PyTuple_Size(idx);

using var defaultArgs = cls.indexer.GetDefaultArgs(idx);

var numOfDefaultArgs = Runtime.PyTuple_Size(defaultArgs.Borrow());

var temp = i + numOfDefaultArgs;

using var real = Runtime.PyTuple_New(temp + 1);

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

{

BorrowedReference item = Runtime.PyTuple_GetItem(idx, n);

Runtime.PyTuple_SetItem(real.Borrow(), n, item);

}

argsTuple.Dispose();

// Add Default Args if needed

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

{

BorrowedReference item = Runtime.PyTuple_GetItem(defaultArgs.Borrow(), n);

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

}

i = temp;

// Add value to argument list

Runtime.PyTuple_SetItem(real.Borrow(), i, v);

using var result = cls.indexer.SetItem(ob, real.Borrow());

return result.IsNull() ? -1 : 0;

}

/// Implements __delitem__ (del x[...]) for IList<T> and IDictionary<TKey, TValue>.

private static int DelImpl(BorrowedReference ob, BorrowedReference idx, ClassBase cls)

{

if (cls.del is null)

{

Exceptions.SetError(Exceptions.TypeError, "object does not support item deletion");

return -1;

}

if (Runtime.PyTuple_Check(idx))

{

Exceptions.SetError(Exceptions.TypeError, "multi-index deletion not supported");

return -1;

}

using var argsTuple = Runtime.PyTuple_New(1);

Runtime.PyTuple_SetItem(argsTuple.Borrow(), 0, idx);

using var result = cls.del.Invoke(ob, argsTuple.Borrow(), kw: null);

if (result.IsNull())

return -1;

if (Runtime.PyBool_CheckExact(result.Borrow()))

{

if (Runtime.PyObject_IsTrue(result.Borrow()) != 0)

return 0;

Exceptions.SetError(Exceptions.KeyError, "key not found");

return -1;

}

if (!result.IsNone())

{

Exceptions.warn("unsupported return type for __delitem__", Exceptions.TypeError);

}

return 0;

}

static NewReference tp_call_impl(BorrowedReference ob, BorrowedReference args, BorrowedReference kw)

{

BorrowedReference tp = Runtime.PyObject_TYPE(ob);

var self = (ClassBase)GetManagedObject(tp)!;

if (!self.type.Valid)

{

return Exceptions.RaiseTypeError(self.type.DeletedMessage);

}

Type type = self.type.Value;

var calls = GetCallImplementations(type).ToList();

Debug.Assert(calls.Count > 0);

var callBinder = new MethodBinder();

foreach (MethodInfo call in calls)

{

callBinder.AddMethod(call);

}

return callBinder.Invoke(ob, args, kw);

}

static NewReference DoConvert(BorrowedReference ob)

{