/// <summary>
/// Implement binding of generic methods using the subscript syntax [].
/// </summary>
public static IntPtr mp_subscript(IntPtr tp, IntPtr idx)
{
var self = (MethodBinding)GetManagedObject(tp);
Type[] types = Runtime.PythonArgsToTypeArray(idx);
if (types == null)
{
return(Exceptions.RaiseTypeError("type(s) expected"));
}
MethodInfo mi = MethodBinder.MatchParameters(self.m.info, types);
if (mi == null)
{
return(Exceptions.RaiseTypeError("No match found for given type params"));
}
var mb = new MethodBinding(self.m, self.target)
{
info = mi
};
Runtime.XIncref(mb.pyHandle);
return(mb.pyHandle);
}
/// <summary>
/// Implement binding of generic methods using the subscript syntax [].
/// </summary>
public static NewReference mp_subscript(BorrowedReference tp, BorrowedReference idx)
{
var self = (MethodBinding)GetManagedObject(tp) !;
Type[]? types = Runtime.PythonArgsToTypeArray(idx);
if (types == null)
{
return(Exceptions.RaiseTypeError("type(s) expected"));
}
MethodBase[] overloads = self.m.IsInstanceConstructor
? self.m.type.Value.GetConstructor(types) is { } ctor
? new[] { ctor }
: Array.Empty <MethodBase>()
: MethodBinder.MatchParameters(self.m.info, types);
if (overloads.Length == 0)
{
return(Exceptions.RaiseTypeError("No match found for given type params"));
}
MethodObject overloaded = self.m.WithOverloads(overloads);
var mb = new MethodBinding(overloaded, self.target, self.targetType);
return(mb.Alloc());
}
internal Binding Bind(IntPtr inst, IntPtr args, IntPtr kw,
MethodBase info, MethodInfo[] methodinfo)
{
// loop to find match, return invoker w/ or /wo error
MethodBase[] _methods = null;
int pynargs = Runtime.PyTuple_Size(args);
object arg;
bool isGeneric = false;
if (info != null)
{
_methods = (MethodBase[])Array.CreateInstance(
typeof(MethodBase), 1
);
_methods.SetValue(info, 0);
}
else
{
_methods = GetMethods();
}
for (int i = 0; i < _methods.Length; i++)
{
MethodBase mi = _methods[i];
if (mi.IsGenericMethod)
{
isGeneric = true;
}
ParameterInfo[] pi = mi.GetParameters();
int clrnargs = pi.Length;
bool match = false;
int arrayStart = -1;
int outs = 0;
if (pynargs == clrnargs)
{
match = true;
}
else if ((pynargs > clrnargs) && (clrnargs > 0) &&
(pi[clrnargs - 1].ParameterType.IsArray))
{
// The last argument of the mananged functions seems to
// accept multiple arguments as a array. Hopefully it's a
// spam(params object[] egg) style method
match = true;
arrayStart = clrnargs - 1;
}
if (match)
{
Object[] margs = new Object[clrnargs];
for (int n = 0; n < clrnargs; n++)
{
IntPtr op;
if (arrayStart == n)
{
// map remaining Python arguments to a tuple since
// the managed function accepts it - hopefully :]
op = Runtime.PyTuple_GetSlice(args, arrayStart, pynargs);
}
else
{
op = Runtime.PyTuple_GetItem(args, n);
}
Type type = pi[n].ParameterType;
if (pi[n].IsOut || type.IsByRef)
{
outs++;
}
if (!Converter.ToManaged(op, type, out arg, false))
{
Exceptions.Clear();
margs = null;
break;
}
if (arrayStart == n)
{
// GetSlice() creates a new reference but GetItem()
// returns only a borrow reference.
Runtime.Decref(op);
}
margs[n] = arg;
}
if (margs == null)
{
continue;
}
Object target = null;
if ((!mi.IsStatic) && (inst != IntPtr.Zero))
{
//CLRObject co = (CLRObject)ManagedType.GetManagedObject(inst);
// InvalidCastException: Unable to cast object of type
// 'Python.Runtime.ClassObject' to type 'Python.Runtime.CLRObject'
CLRObject co = ManagedType.GetManagedObject(inst) as CLRObject;
// Sanity check: this ensures a graceful exit if someone does
// something intentionally wrong like call a non-static method
// on the class rather than on an instance of the class.
// XXX maybe better to do this before all the other rigmarole.
if (co == null)
{
return(null);
}
target = co.inst;
}
return(new Binding(mi, target, margs, outs));
}
}
// We weren't able to find a matching method but at least one
// is a generic method and info is null. That happens when a generic
// method was not called using the [] syntax. Let's introspect the
// type of the arguments and use it to construct the correct method.
if (isGeneric && (info == null) && (methodinfo != null))
{
Type[] types = Runtime.PythonArgsToTypeArray(args, true);
MethodInfo mi = MethodBinder.MatchParameters(methodinfo, types);
return(Bind(inst, args, kw, mi, null));
}
return(null);
}
internal Binding Bind(IntPtr inst, IntPtr args, IntPtr kw,
MethodBase info, MethodInfo[] methodinfo)
{
// loop to find match, return invoker w/ or /wo error
MethodBase[] _methods = null;
int pynargs = Runtime.PyTuple_Size(args);
object arg;
bool isGeneric = false;
ArrayList defaultArgList = null;
if (info != null)
{
_methods = (MethodBase[])Array.CreateInstance(
typeof(MethodBase), 1
);
_methods.SetValue(info, 0);
}
else
{
_methods = GetMethods();
}
Type clrtype;
for (int i = 0; i < _methods.Length; i++)
{
MethodBase mi = _methods[i];
if (mi.IsGenericMethod)
{
isGeneric = true;
}
ParameterInfo[] pi = mi.GetParameters();
int clrnargs = pi.Length;
bool match = false;
int arrayStart = -1;
int outs = 0;
if (pynargs == clrnargs)
{
match = true;
}
else if (pynargs < clrnargs)
{
match = true;
defaultArgList = new ArrayList();
for (int v = pynargs; v < clrnargs; v++)
{
if (pi[v].DefaultValue == DBNull.Value)
{
match = false;
}
else
{
defaultArgList.Add((object)pi[v].DefaultValue);
}
}
}
else if ((pynargs > clrnargs) && (clrnargs > 0) &&
Attribute.IsDefined(pi[clrnargs - 1], typeof(ParamArrayAttribute)))
{
// This is a spam(params object[] egg) style method
match = true;
arrayStart = clrnargs - 1;
}
if (match)
{
Object[] margs = new Object[clrnargs];
for (int n = 0; n < clrnargs; n++)
{
IntPtr op;
if (n < pynargs)
{
if (arrayStart == n)
{
// map remaining Python arguments to a tuple since
// the managed function accepts it - hopefully :]
op = Runtime.PyTuple_GetSlice(args, arrayStart, pynargs);
}
else
{
op = Runtime.PyTuple_GetItem(args, n);
}
// this logic below handles cases when multiple overloading methods
// are ambiguous, hence comparison between Python and CLR types
// is necessary
clrtype = null;
IntPtr pyoptype;
if (_methods.Length > 1)
{
pyoptype = IntPtr.Zero;
pyoptype = Runtime.PyObject_Type(op);
Exceptions.Clear();
if (pyoptype != IntPtr.Zero)
{
clrtype = Converter.GetTypeByAlias(pyoptype);
}
Runtime.XDecref(pyoptype);
}
if (clrtype != null)
{
bool typematch = false;
if (pi[n].ParameterType != clrtype)
{
IntPtr pytype = Converter.GetPythonTypeByAlias(pi[n].ParameterType);
pyoptype = Runtime.PyObject_Type(op);
Exceptions.Clear();
if (pyoptype != IntPtr.Zero)
{
if (pytype != pyoptype)
{
typematch = false;
}
else
{
typematch = true;
clrtype = pi[n].ParameterType;
}
}
if (!typematch)
{
// this takes care of enum values
TypeCode argtypecode = Type.GetTypeCode(pi[n].ParameterType);
TypeCode paramtypecode = Type.GetTypeCode(clrtype);
if (argtypecode == paramtypecode)
{
typematch = true;
clrtype = pi[n].ParameterType;
}
}
Runtime.XDecref(pyoptype);
if (!typematch)
{
margs = null;
break;
}
}
else
{
typematch = true;
clrtype = pi[n].ParameterType;
}
}
else
{
clrtype = pi[n].ParameterType;
}
if (pi[n].IsOut || clrtype.IsByRef)
{
outs++;
}
if (!Converter.ToManaged(op, clrtype, out arg, false))
{
Exceptions.Clear();
margs = null;
break;
}
if (arrayStart == n)
{
// GetSlice() creates a new reference but GetItem()
// returns only a borrow reference.
Runtime.XDecref(op);
}
margs[n] = arg;
}
else
{
if (defaultArgList != null)
{
margs[n] = defaultArgList[n - pynargs];
}
}
}
if (margs == null)
{
continue;
}
Object target = null;
if ((!mi.IsStatic) && (inst != IntPtr.Zero))
{
//CLRObject co = (CLRObject)ManagedType.GetManagedObject(inst);
// InvalidCastException: Unable to cast object of type
// 'Python.Runtime.ClassObject' to type 'Python.Runtime.CLRObject'
CLRObject co = ManagedType.GetManagedObject(inst) as CLRObject;
// Sanity check: this ensures a graceful exit if someone does
// something intentionally wrong like call a non-static method
// on the class rather than on an instance of the class.
// XXX maybe better to do this before all the other rigmarole.
if (co == null)
{
return(null);
}
target = co.inst;
}
return(new Binding(mi, target, margs, outs));
}
}
// We weren't able to find a matching method but at least one
// is a generic method and info is null. That happens when a generic
// method was not called using the [] syntax. Let's introspect the
// type of the arguments and use it to construct the correct method.
if (isGeneric && (info == null) && (methodinfo != null))
{
Type[] types = Runtime.PythonArgsToTypeArray(args, true);
MethodInfo mi = MethodBinder.MatchParameters(methodinfo, types);
return(Bind(inst, args, kw, mi, null));
}
return(null);
}
