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167 lines (146 loc) · 5.78 KB
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using System.Linq;
using System;
using System.Reflection;
namespace Python.Runtime
{
/// <summary>
/// Managed class that provides the implementation for reflected types.
/// Managed classes and value types are represented in Python by actual
/// Python type objects. Each of those type objects is associated with
/// an instance of ClassObject, which provides its implementation.
/// </summary>
[Serializable]
internal class ClassObject : ClassBase
{
internal ConstructorBinder binder;
internal int NumCtors = 0;
internal ClassObject(Type tp) : base(tp)
{
var _ctors = type.Value.GetConstructors();
NumCtors = _ctors.Length;
binder = new ConstructorBinder(type.Value);
foreach (ConstructorInfo t in _ctors)
{
binder.AddMethod(t);
}
}
/// <summary>
/// Helper to get docstring from reflected constructor info.
/// </summary>
internal NewReference GetDocString()
{
MethodBase[] methods = binder.GetMethods();
var str = "";
foreach (MethodBase t in methods)
{
if (str.Length > 0)
{
str += Environment.NewLine;
}
str += t.ToString();
}
return NewReference.DangerousFromPointer(Runtime.PyString_FromString(str));
}
/// <summary>
/// Implements __new__ for reflected classes and value types.
/// </summary>
public static IntPtr tp_new(IntPtr tp, IntPtr args, IntPtr kw)
{
var self = GetManagedObject(tp) as ClassObject;
// Sanity check: this ensures a graceful error if someone does
// something intentially wrong like use the managed metatype for
// a class that is not really derived from a managed class.
if (self == null)
{
return Exceptions.RaiseTypeError("invalid object");
}
if (!self.type.Valid)
{
return Exceptions.RaiseTypeError(self.type.DeletedMessage);
}
Type type = self.type.Value;
// Primitive types do not have constructors, but they look like
// they do from Python. If the ClassObject represents one of the
// convertible primitive types, just convert the arg directly.
if (type.IsPrimitive || type == typeof(string))
{
if (Runtime.PyTuple_Size(args) != 1)
{
Exceptions.SetError(Exceptions.TypeError, "no constructors match given arguments");
return IntPtr.Zero;
}
IntPtr op = Runtime.PyTuple_GetItem(args, 0);
object result;
if (!Converter.ToManaged(op, type, out result, true))
{
return IntPtr.Zero;
}
return CLRObject.GetInstHandle(result, tp);
}
if (type.IsAbstract)
{
Exceptions.SetError(Exceptions.TypeError, "cannot instantiate abstract class");
return IntPtr.Zero;
}
if (type.IsEnum)
{
Exceptions.SetError(Exceptions.TypeError, "cannot instantiate enumeration");
return IntPtr.Zero;
}
object obj = self.binder.InvokeRaw(IntPtr.Zero, args, kw);
if (obj == null)
{
return IntPtr.Zero;
}
return CLRObject.GetInstHandle(obj, tp);
}
/// <summary>
/// Implementation of [] semantics for reflected types. This exists
/// both to implement the Array[int] syntax for creating arrays and
/// to support generic name overload resolution using [].
/// </summary>
public override IntPtr type_subscript(IntPtr idx)
{
if (!type.Valid)
{
return Exceptions.RaiseTypeError(type.DeletedMessage);
}
// If this type is the Array type, the [<type>] means we need to
// construct and return an array type of the given element type.
if (type.Value == typeof(Array))
{
if (Runtime.PyTuple_Check(idx))
{
return Exceptions.RaiseTypeError("type expected");
}
var c = GetManagedObject(idx) as ClassBase;
Type t = c != null ? c.type.Value : Converter.GetTypeByAlias(idx);
if (t == null)
{
return Exceptions.RaiseTypeError("type expected");
}
Type a = t.MakeArrayType();
ClassBase o = ClassManager.GetClass(a);
Runtime.XIncref(o.pyHandle);
return o.pyHandle;
}
// If there are generics in our namespace with the same base name
// as the current type, then [<type>] means the caller wants to
// bind the generic type matching the given type parameters.
Type[] types = Runtime.PythonArgsToTypeArray(idx);
if (types == null)
{
return Exceptions.RaiseTypeError("type(s) expected");
}
Type gtype = AssemblyManager.LookupTypes($"{type.Value.FullName}`{types.Length}").FirstOrDefault();
if (gtype != null)
{
var g = ClassManager.GetClass(gtype) as GenericType;
return g.type_subscript(idx);
//Runtime.XIncref(g.pyHandle);
//return g.pyHandle;
}
return Exceptions.RaiseTypeError("unsubscriptable object");
}
}
}