/// <summary>
/// Builds a new MethodCandidate which takes count arguments and the provided list of keyword arguments.
///
/// The basic idea here is to figure out which parameters map to params or a dictionary params and
/// fill in those spots w/ extra ParameterWrapper's.
/// </summary>
internal MethodCandidate MakeParamsExtended(ActionBinder binder, int count, SymbolId[] names)
{
Debug.Assert(BinderHelpers.IsParamsMethod(_target.Method));
List <ParameterWrapper> newParameters = new List <ParameterWrapper>(count);
// if we don't have a param array we'll have a param dict which is type object
Type elementType = null;
int index = -1, kwIndex = -1;
// keep track of which kw args map to a real argument, and which ones
// map to the params dictionary.
List <SymbolId> unusedNames = new List <SymbolId>(names);
List <int> unusedNameIndexes = new List <int>();
for (int i = 0; i < unusedNames.Count; i++)
{
unusedNameIndexes.Add(i);
}
for (int i = 0; i < _parameters.Count; i++)
{
ParameterWrapper pw = _parameters[i];
if (_parameters[i].IsParamsDict)
{
kwIndex = i;
}
else if (_parameters[i].IsParamsArray)
{
elementType = pw.Type.GetElementType();
index = i;
}
else
{
for (int j = 0; j < unusedNames.Count; j++)
{
if (unusedNames[j] == _parameters[i].Name)
{
unusedNames.RemoveAt(j);
unusedNameIndexes.RemoveAt(j);
break;
}
}
newParameters.Add(pw);
}
}
if (index != -1)
{
while (newParameters.Count < (count - unusedNames.Count))
{
ParameterWrapper param = new ParameterWrapper(binder, elementType, SymbolId.Empty, false);
newParameters.Insert(System.Math.Min(index, newParameters.Count), param);
}
}
if (kwIndex != -1)
{
foreach (SymbolId si in unusedNames)
{
newParameters.Add(new ParameterWrapper(binder, typeof(object), si, false));
}
}
else if (unusedNames.Count != 0)
{
// unbound kw args and no where to put them, can't call...
// TODO: We could do better here because this results in an incorrect arg # error message.
return(null);
}
// if we have too many or too few args we also can't call
if (count != newParameters.Count)
{
return(null);
}
return(new MethodCandidate(_target.MakeParamsExtended(count, unusedNames.ToArray(), unusedNameIndexes.ToArray()), newParameters));
}