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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>

internal class ClassObject : ClassBase

{

internal ConstructorBinder binder;

internal ConstructorInfo[] ctors;

internal ClassObject(Type tp) : base(tp)

{

ctors = type.GetConstructors();

binder = new ConstructorBinder(type);

foreach (ConstructorInfo t in ctors)

{

binder.AddMethod(t);

}

/// <summary>

/// Helper to get docstring from reflected constructor info.

/// </summary>

internal IntPtr GetDocString()

{

MethodBase[] methods = binder.GetMethods();

var str = "";

foreach (MethodBase t in methods)

{

if (str.Length > 0)

{

str += Environment.NewLine;

}

str += t.ToString();

}

return 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");

}

Type type = self.type;

// 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 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 == typeof(Array))

{

if (Runtime.PyTuple_Check(idx))

{

return Exceptions.RaiseTypeError("type expected");

}

var c = GetManagedObject(idx) as ClassBase;

Type t = c != null ? c.type : 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.LookupType($"{type.FullName}`{types.Length}");

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");

}

/// <summary>

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

/// </summary>

public static IntPtr mp_subscript(IntPtr ob, IntPtr idx)

{

//ManagedType self = GetManagedObject(ob);

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)

{

//ManagedType self = GetManagedObject(ob);

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;

}

/// <summary>

/// This is a hack. Generally, no managed class is considered callable

/// from Python - with the exception of System.Delegate. It is useful

/// to be able to call a System.Delegate instance directly, especially

/// when working with multicast delegates.

/// </summary>

public static IntPtr tp_call(IntPtr ob, IntPtr args, IntPtr kw)

{

//ManagedType self = GetManagedObject(ob);

IntPtr tp = Runtime.PyObject_TYPE(ob);

var cb = (ClassBase)GetManagedObject(tp);

if (cb.type != typeof(Delegate))

{

Exceptions.SetError(Exceptions.TypeError, "object is not callable");

return IntPtr.Zero;

}

var co = (CLRObject)GetManagedObject(ob);

var d = co.inst as Delegate;

BindingFlags flags = BindingFlags.Public |

BindingFlags.NonPublic |

BindingFlags.Instance |

BindingFlags.Static;

MethodInfo method = d.GetType().GetMethod("Invoke", flags);

var binder = new MethodBinder(method);

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

}

pythonnet/Python.Runtime/classobject.cs at modernisation · amszwolf/pythonnet · GitHub

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