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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();
}
}
}