public Expression ConvertMethodParameters(OverloadResolutionData <MethodInfo> resolvedMethod, Expression target, DynamicMetaObject[] args)//, Type[] argTypeArray)
{
if (resolvedMethod == null)
{
throw new ArgumentNullException(nameof(resolvedMethod));
}
if (args == null)
{
throw new ArgumentNullException(nameof(args));
}
var argExpressions = _overloadResolver.CreateParameterExpressions(resolvedMethod, args);
var method = resolvedMethod.FunctionMember;
Expression result = Expression.Call(
VelocityExpressions.ConvertIfNeeded(target, method.DeclaringType),
method,
argExpressions
);
if (method.ReturnType == typeof(void))
{
result = Expression.Block(
result,
Constants.VoidReturnValue
);
}
return(result);
}
public IImmutableList<Expression> CreateParameterExpressions<T>(OverloadResolutionData<T> overload, DynamicMetaObject[] args)
where T : MemberInfo
{
if (overload == null)
throw new ArgumentNullException(nameof(overload));
if (args == null)
throw new ArgumentNullException(nameof(args));
var parameters = overload.Parameters;
bool isInExpandedForm = overload.ApplicableForm == ApplicableForm.Expanded;
int fixedParams = isInExpandedForm
? parameters.Length - 1
: parameters.Length;
var argExpressionBuilder = ImmutableArray.CreateBuilder<Expression>(parameters.Length);
for (int i = 0; i < fixedParams; i++)
{
var parameter = parameters[i];
argExpressionBuilder.Add(VelocityExpressions.ConvertIfNeeded(args[i], parameter));
}
if (isInExpandedForm)
{
var lastParameter = overload.Parameters.Last();
var elementType = lastParameter.GetElementType();
argExpressionBuilder.Add(Expression.NewArrayInit(
elementType,
args.Skip(fixedParams)
.Select(x => VelocityExpressions.ConvertIfNeeded(x, elementType))
));
}
return argExpressionBuilder.ToImmutable();
}
public BetterResult IsBetterFunctionMember<T>(IImmutableList<Type> arguments, OverloadResolutionData<T> left, OverloadResolutionData<T> right)
where T : MemberInfo
{
if (left == null)
throw new ArgumentNullException(nameof(left));
if (right == null)
throw new ArgumentNullException(nameof(right));
// - for each argument, the implicit conversion from EX to QX is not better than the implicit conversion from EX to PX, and
// - for at least one argument, the conversion from EX to PX is better than the conversion from EX to QX.
bool leftIsBetter = false;
bool rightIsBetter = false;
for (int i = 0; i < arguments.Count; i++)
{
var expressionType = arguments[i];
var leftParamType = left.GetExpandedParameterType(i);
var rightParamType = right.GetExpandedParameterType(i);
leftIsBetter |= IsBetterConversionFromExpression(expressionType, leftParamType, rightParamType);
rightIsBetter |= IsBetterConversionFromExpression(expressionType, rightParamType, leftParamType);
}
if (leftIsBetter != rightIsBetter)
{
return leftIsBetter
? BetterResult.Better
: BetterResult.Worse;
}
// Otherwise, if MP is applicable in its normal form and MQ has a params array and is applicable
// only in its expanded form, then MP is better than MQ.
if (left.ApplicableForm != right.ApplicableForm)
{
return left.ApplicableForm == ApplicableForm.Normal
? BetterResult.Better
: BetterResult.Worse;
}
// Otherwise, if MP has more declared parameters than MQ, then MP is better than MQ. This can
// occur if both methods have params arrays and are applicable only in their expanded forms.
var leftParamCount = left.Parameters.Length;
var rightParamCount = right.Parameters.Length;
if (leftParamCount != rightParamCount)
{
return leftParamCount > rightParamCount
? BetterResult.Better
: BetterResult.Worse;
}
return BetterResult.Incomparable;
}
