static bool ParamArrayMatchs(Type[] types, int index, Type dest, ArgumentConversions conversions)
{
var binder = new ArgumentConversions(types.Length - index);
// check first parameter type matches
for (int i = 0, current = index; current < types.Length; i++, current++)
{
var src = types[current];
if (src is null)
{
if (dest.IsValueType && !dest.IsNullableType())
{
return(false);
}
}
else if (!TypeUtils.AreReferenceAssignable(dest, src))
{
if (src.TryImplicitConvert(dest, out MethodInfo opImplict) == false)
{
return(false);
}
if (src.IsValueType && opImplict.GetParameters()[0].ParameterType.IsValueType == false)
{
binder.Add(new BoxConversion(i, src));
}
binder.Add(new ParamConversion(i, opImplict));
}
else if (src.IsValueType && dest.IsValueType == false)
{
conversions.Add(new BoxConversion(i, src));
}
}
conversions.Add(new ParamArrayConversion(index, dest, binder));
return(true);
}
static System.Reflection.MethodInfo VisitAddition(Expression left, Expression right, ArgumentConversions conversions)
{
if (left.Type.Name.Equals(TypeProvider.String))
{
if (right.Type.Name.Equals(TypeProvider.String))
{
return(VisitBinary(left, right, Operators.Addition, conversions));
}
if (right.Type.IsValueType)
{
conversions.Add(new BoxConversion(1, right.Type));
}
conversions.Add(new ParamConversion(1, ReflectionHelpers.AnyToString));
right.Type = TypeProvider.StringType;
return(VisitBinary(left, right, Operators.Addition, conversions));
}
if (right.Type.Name.Equals(TypeProvider.String))
{
if (left.Type.Name.Equals(TypeProvider.String))
{
return(VisitBinary(left, right, Operators.Addition, conversions));
}
if (right.Type.IsValueType)
{
conversions.Add(new BoxConversion(1, left.Type));
}
conversions.Add(new ParamConversion(0, ReflectionHelpers.AnyToString));
left.Type = TypeProvider.StringType;
return(VisitBinary(left, right, Operators.Addition, conversions));
}
return(VisitBinary(left, right, Operators.Addition, conversions));
}
public static bool MatchesArgumentTypes(this MethodBase method, Type[] types, ArgumentConversions conversions)
{
var parameters = method.GetParameters();
var length = types.Length;
if (parameters.Length < length)
{
return(false);
}
int i;
for (i = 0; i < parameters.Length; i++)
{
var param = parameters[i];
var dest = param.ParameterType;
if (param.IsDefined(typeof(ParamArrayAttribute), false))
{
// parameters is extra example print(string, params string[] args) and print('hello')
// in this case 2 and 1
if (parameters.Length > length)
{
conversions.Add(new ParamArrayConversion(i, dest.GetElementType()));
return(true);
}
//No further check required if matchs
return(ParamArrayMatchs(types, i, dest.GetElementType(), conversions));
}
// matches current index
if (i >= length)
{
return(conversions.Recycle());
}
var src = types[i];
if (src is null)
{
if (dest.IsValueType && !dest.IsNullableType())
{
return(conversions.Recycle());
}
}
else if (!TypeUtils.AreReferenceAssignable(dest, src))
{
if (src.TryImplicitConvert(dest, out MethodInfo m) == false)
{
return(conversions.Recycle());
}
if (src.IsValueType && m.GetParameters()[0].ParameterType.IsValueType == false)
{
conversions.Add(new BoxConversion(i, src));
}
conversions.Add(new ParamConversion(i, m));
}
if (src.IsValueType && dest.IsValueType == false)
{
conversions.Add(new BoxConversion(i, src));
}
}
if (i == length)
{
return(true);
}
return(conversions.Recycle());
}