mirror of
https://github.com/microsoft/PowerToys.git
synced 2024-12-05 04:39:08 +08:00
97 lines
4.6 KiB
C#
97 lines
4.6 KiB
C#
// ==========================================================================
|
|
// This software is subject to the provisions of the Zope Public License,
|
|
// Version 2.0 (ZPL). A copy of the ZPL should accompany this distribution.
|
|
// THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED
|
|
// WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
|
|
// WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS
|
|
// FOR A PARTICULAR PURPOSE.
|
|
// ==========================================================================
|
|
|
|
using System;
|
|
using System.Reflection;
|
|
|
|
namespace Python.Runtime {
|
|
|
|
//========================================================================
|
|
// A ConstructorBinder encapsulates information about one or more managed
|
|
// constructors, and is responsible for selecting the right constructor
|
|
// given a set of Python arguments. This is slightly different than the
|
|
// standard MethodBinder because of a difference in invoking constructors
|
|
// using reflection (which is seems to be a CLR bug).
|
|
//========================================================================
|
|
|
|
internal class ConstructorBinder : MethodBinder {
|
|
|
|
internal ConstructorBinder () : base() {}
|
|
|
|
//====================================================================
|
|
// Constructors get invoked when an instance of a wrapped managed
|
|
// class or a subclass of a managed class is created. This differs
|
|
// from the MethodBinder implementation in that we return the raw
|
|
// result of the constructor rather than wrapping it as a Python
|
|
// object - the reason is that only the caller knows the correct
|
|
// Python type to use when wrapping the result (may be a subclass).
|
|
//====================================================================
|
|
|
|
internal object InvokeRaw(IntPtr inst, IntPtr args, IntPtr kw) {
|
|
return this.InvokeRaw(inst, args, kw, null);
|
|
}
|
|
/// <summary>
|
|
/// Allows ctor selection to be limited to a single attempt at a
|
|
/// match by providing the MethodBase to use instead of searching
|
|
/// the entire MethodBinder.list (generic ArrayList)
|
|
/// </summary>
|
|
/// <param name="inst"> (possibly null) instance </param>
|
|
/// <param name="args"> PyObject* to the arg tuple </param>
|
|
/// <param name="kw"> PyObject* to the keyword args dict </param>
|
|
/// <param name="info"> The sole ContructorInfo to use or null </param>
|
|
/// <returns> The result of the constructor call with converted params </returns>
|
|
/// <remarks>
|
|
/// 2010-07-24 BC: I added the info parameter to the call to Bind()
|
|
/// Binding binding = this.Bind(inst, args, kw, info);
|
|
/// to take advantage of Bind()'s ability to use a single MethodBase (CI or MI).
|
|
/// </remarks>
|
|
internal object InvokeRaw(IntPtr inst, IntPtr args, IntPtr kw,
|
|
MethodBase info) {
|
|
Binding binding = this.Bind(inst, args, kw, info);
|
|
Object result;
|
|
|
|
if (binding == null) {
|
|
// It is possible for __new__ to be invoked on construction
|
|
// of a Python subclass of a managed class, so args may
|
|
// reflect more args than are required to instantiate the
|
|
// class. So if we cant find a ctor that matches, we'll see
|
|
// if there is a default constructor and, if so, assume that
|
|
// any extra args are intended for the subclass' __init__.
|
|
|
|
IntPtr eargs = Runtime.PyTuple_New(0);
|
|
binding = this.Bind(inst, eargs, kw);
|
|
Runtime.Decref(eargs);
|
|
|
|
if (binding == null) {
|
|
Exceptions.SetError(Exceptions.TypeError,
|
|
"no constructor matches given arguments"
|
|
);
|
|
return null;
|
|
}
|
|
}
|
|
|
|
// Fire the selected ctor and catch errors...
|
|
ConstructorInfo ci = (ConstructorInfo)binding.info;
|
|
// Object construction is presumed to be non-blocking and fast
|
|
// enough that we shouldn't really need to release the GIL.
|
|
try {
|
|
result = ci.Invoke(binding.args);
|
|
}
|
|
catch (Exception e) {
|
|
if (e.InnerException != null) {
|
|
e = e.InnerException;
|
|
}
|
|
Exceptions.SetError(e);
|
|
return null;
|
|
}
|
|
return result;
|
|
}
|
|
}
|
|
}
|