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indexer.cs
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indexer.cs
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using System;
using System.Collections;
using System.Reflection;
using System.Security.Permissions;
namespace Python.Runtime
{
//========================================================================
// Bundles the information required to support an indexer property.
//========================================================================
internal class Indexer
{
public MethodBinder GetterBinder;
public MethodBinder SetterBinder;
public Indexer()
{
GetterBinder = new MethodBinder();
SetterBinder = new MethodBinder();
}
public bool CanGet
{
get { return GetterBinder.Count > 0; }
}
public bool CanSet
{
get { return SetterBinder.Count > 0; }
}
public void AddProperty(PropertyInfo pi)
{
MethodInfo getter = pi.GetGetMethod(true);
MethodInfo setter = pi.GetSetMethod(true);
if (getter != null)
{
GetterBinder.AddMethod(getter);
}
if (setter != null)
{
SetterBinder.AddMethod(setter);
}
}
internal IntPtr GetItem(IntPtr inst, IntPtr args)
{
return GetterBinder.Invoke(inst, args, IntPtr.Zero);
}
internal void SetItem(IntPtr inst, IntPtr args)
{
SetterBinder.Invoke(inst, args, IntPtr.Zero);
}
internal bool NeedsDefaultArgs(IntPtr args)
{
int pynargs = Runtime.PyTuple_Size(args);
var methods = SetterBinder.GetMethods();
if (methods.Length == 0)
return false;
MethodBase mi = methods[0];
ParameterInfo[] pi = mi.GetParameters();
// need to subtract one for the value
int clrnargs = pi.Length - 1;
if (pynargs == clrnargs || pynargs > clrnargs)
return false;
for (int v = pynargs; v < clrnargs; v++)
{
if (pi[v].DefaultValue == DBNull.Value)
return false;
}
return true;
}
/// <summary>
/// This will return default arguments a new instance of a tuple. The size
/// of the tuple will indicate the number of default arguments.
/// </summary>
/// <param name="args">This is pointing to the tuple args passed in</param>
/// <returns>a new instance of the tuple containing the default args</returns>
internal IntPtr GetDefaultArgs(IntPtr args)
{
// if we don't need default args return empty tuple
if (!NeedsDefaultArgs(args))
return Runtime.PyTuple_New(0);
int pynargs = Runtime.PyTuple_Size(args);
// Get the default arg tuple
var methods = SetterBinder.GetMethods();
MethodBase mi = methods[0];
ParameterInfo[] pi = mi.GetParameters();
int clrnargs = pi.Length - 1;
IntPtr defaultArgs = Runtime.PyTuple_New(clrnargs - pynargs);
for (int i = 0; i < (clrnargs - pynargs); i++)
{
if (pi[i + pynargs].DefaultValue == DBNull.Value)
continue;
else
{
IntPtr arg = Converter.ToPython(pi[i + pynargs].DefaultValue, pi[i + pynargs].ParameterType);
Runtime.PyTuple_SetItem(defaultArgs, i, arg);
}
}
return defaultArgs;
}
}
}