using System;
using System.Collections;
using System.Collections.Generic;
namespace Python.Runtime
{
///
/// 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.
///
[Serializable]
internal class ClassBase : ManagedType
{
[NonSerialized]
internal List dotNetMembers;
internal Indexer indexer;
internal Dictionary richcompare;
internal MaybeType type;
internal ClassBase(Type tp)
{
dotNetMembers = new List();
indexer = null;
type = tp;
}
internal virtual bool CanSubclass()
{
return !type.Value.IsEnum;
}
public readonly static Dictionary CilToPyOpMap = new Dictionary
{
["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,
};
///
/// Default implementation of [] semantics for reflected types.
///
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;
try
{
// MakeGenericType can throw ArgumentException
t = target.MakeGenericType(types);
}
catch (ArgumentException e)
{
return Exceptions.RaiseTypeError(e.Message);
}
ManagedType c = ClassManager.GetClass(t);
Runtime.XIncref(c.pyHandle);
return c.pyHandle;
}
return Exceptions.RaiseTypeError($"{type.Value.Namespace}.{type.Name} does not accept {types.Length} generic parameters");
}
///
/// Standard comparison implementation for instances of reflected types.
///
public static IntPtr tp_richcompare(IntPtr ob, IntPtr other, int op)
{
CLRObject co1;
CLRObject co2;
IntPtr tp = Runtime.PyObject_TYPE(ob);
var cls = (ClassBase)GetManagedObject(tp);
// C# operator methods take precedence over IComparable.
// We first check if there's a comparison operator by looking up the richcompare table,
// otherwise fallback to checking if an IComparable interface is handled.
if (cls.richcompare.TryGetValue(op, out var methodObject))
{
// Wrap the `other` argument of a binary comparison operator in a PyTuple.
IntPtr args = Runtime.PyTuple_New(1);
Runtime.XIncref(other);
Runtime.PyTuple_SetItem(args, 0, other);
IntPtr value;
try
{
value = methodObject.Invoke(ob, args, IntPtr.Zero);
}
finally
{
Runtime.XDecref(args); // Free args pytuple
}
return value;
}
switch (op)
{
case Runtime.Py_EQ:
case Runtime.Py_NE:
IntPtr pytrue = Runtime.PyTrue;
IntPtr pyfalse = Runtime.PyFalse;
// swap true and false for NE
if (op != Runtime.Py_EQ)
{
pytrue = Runtime.PyFalse;
pyfalse = Runtime.PyTrue;
}
if (ob == other)
{
Runtime.XIncref(pytrue);
return pytrue;
}
co1 = GetManagedObject(ob) as CLRObject;
co2 = GetManagedObject(other) as CLRObject;
if (null == co2)
{
Runtime.XIncref(pyfalse);
return pyfalse;
}
object o1 = co1.inst;
object o2 = co2.inst;
if (Equals(o1, o2))
{
Runtime.XIncref(pytrue);
return pytrue;
}
Runtime.XIncref(pyfalse);
return pyfalse;
case Runtime.Py_LT:
case Runtime.Py_LE:
case Runtime.Py_GT:
case Runtime.Py_GE:
co1 = GetManagedObject(ob) as CLRObject;
co2 = GetManagedObject(other) as CLRObject;
if (co1 == null || co2 == null)
{
return Exceptions.RaiseTypeError("Cannot get managed object");
}
var co1Comp = co1.inst as IComparable;
if (co1Comp == null)
{
Type co1Type = co1.GetType();
return Exceptions.RaiseTypeError($"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;
}
}
///
/// Standard iteration support for instances of reflected types. This
/// allows natural iteration over objects that either are IEnumerable
/// or themselves support IEnumerator directly.
///
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;
}
///
/// Standard __hash__ implementation for instances of reflected types.
///
public static nint tp_hash(IntPtr ob)
{
var co = GetManagedObject(ob) as CLRObject;
if (co == null)
{
return Exceptions.RaiseTypeError("unhashable type");
}
return co.inst.GetHashCode();
}
///
/// Standard __str__ implementation for instances of reflected types.
///
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;
}
}
///
/// Standard dealloc implementation for instances of reflected types.
///
public static void tp_dealloc(IntPtr ob)
{
ManagedType self = GetManagedObject(ob);
tp_clear(ob);
Runtime.PyObject_GC_UnTrack(ob);
Runtime.PyObject_GC_Del(ob);
self?.FreeGCHandle();
}
public static int tp_clear(IntPtr ob)
{
ManagedType self = GetManagedObject(ob);
bool isTypeObject = Runtime.PyObject_TYPE(ob) == Runtime.PyCLRMetaType;
if (!isTypeObject)
{
ClearObjectDict(ob);
}
if (self is not null) self.tpHandle = IntPtr.Zero;
return 0;
}
protected override void OnSave(InterDomainContext context)
{
base.OnSave(context);
if (!this.IsClrMetaTypeInstance())
{
IntPtr dict = GetObjectDict(pyHandle);
Runtime.XIncref(dict);
context.Storage.AddValue("dict", dict);
}
}
protected override void OnLoad(InterDomainContext context)
{
base.OnLoad(context);
if (!this.IsClrMetaTypeInstance())
{
IntPtr dict = context.Storage.GetValue("dict");
SetObjectDict(pyHandle, dict);
}
gcHandle = AllocGCHandle();
SetGCHandle(ObjectReference, gcHandle);
}
///
/// Implements __getitem__ for reflected classes and value types.
///
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;
}
///
/// Implements __setitem__ for reflected classes and value types.
///
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;
}
}
}