private FunctionCallInfo CheckConstraintsAndReturn(OverloadCompatibility compatibility, CallLocation location)
{
if (RespectsAllConstraints(compatibility.Substitutions))
{
return(new FunctionCallInfo(AfterSubstitution(compatibility), compatibility.Substitutions));
}
errors.Add(new CallArgumentsViolateParametersConstraints(location.File, location.Line, location.CallString));
return(new FunctionCallInfo(new ErrorSignature(new UndefinedType()), ImmutableHashSet <Substitution> .Empty));
}
private FunctionCallInfo CouldNotFindMatchingOverload(CallLocation location)
{
errors.Add(new NoMatchingOverloadForCall(location.File, location.Line, location.CallString));
return(new FunctionCallInfo(new ErrorSignature(new UndefinedType()), ImmutableHashSet <Substitution> .Empty));
}
private FunctionCallInfo AmbiguousFunctionCall(CallLocation location)
{
errors.Add(new CouldNotResolveAmbiguousFunctionCall(location.File, location.Line, location.CallString));
return(new FunctionCallInfo(new ErrorSignature(new UndefinedType()), ImmutableHashSet <Substitution> .Empty));
}
private FunctionCallInfo BindFunctionCallCore(IReadOnlyList <Callable> overloads,
IReadOnlyList <IType> argumentsTypes,
IReadOnlyList <IType> explicitTypeArguments,
bool isPoly,
CallLocation location)
{
//check for use of undefined function/overload
if (overloads.None())
{
errors.Add(new UseOfUndeclaredFunction(location.File, location.Line, location.CallString));
return(new FunctionCallInfo(new ErrorSignature(new UndefinedType()), ImmutableHashSet <Substitution> .Empty));
}
//check for calls that use undefined arguments
if (argumentsTypes.Any(x => x is UndefinedType) || explicitTypeArguments.Any(x => x is UndefinedType))
{
return(new FunctionCallInfo(new ErrorSignature(new UndefinedType()), ImmutableHashSet <Substitution> .Empty));
}
if (isPoly)
{
var overloadsInfo = getCompatibility(true);
var possibleAtRuntime = overloadsInfo.Where(x => x.IsCompatible()).Select(x => new FunctionCallInfo(AfterSubstitution(x), x.Substitutions)).ToList();
if (possibleAtRuntime.One())
{
return(possibleAtRuntime.First());
}
if (possibleAtRuntime.None())
{
return(CouldNotFindMatchingOverload(location));
}
return(getDispatcherOrErrorSignature());
FunctionCallInfo getDispatcherOrErrorSignature()
{
return(possibleAtRuntime.AllHaveSame(x => x.Callable.ReturnType)
? new FunctionCallInfo(new Dispatcher(possibleAtRuntime.ToImmutableArray()), ImmutableHashSet <Substitution> .Empty)
: new FunctionCallInfo(new ErrorSignature(new UndefinedType()), ImmutableHashSet <Substitution> .Empty));
}
}
else
{
var overloadsInfo = getCompatibility(false);
var compatibleOverloads = overloadsInfo.Where(x => x.IsCompatible()).ToList();
if (compatibleOverloads.One())
{
return(checkConstraintsAndReturn(compatibleOverloads.First()));
}
if (compatibleOverloads.None())
{
return(CouldNotFindMatchingOverload(location));
}
return(resolve());
FunctionCallInfo resolve()
{
var perfectMatches = compatibleOverloads.Where(IsPerfectCompatibility).ToImmutableArray();
return(perfectMatches.One()
? checkConstraintsAndReturn(perfectMatches.First())
: AmbiguousFunctionCall(location));
}
}
FunctionCallInfo checkConstraintsAndReturn(OverloadCompatibility x) => CheckConstraintsAndReturn(x, location);
IEnumerable <OverloadCompatibility> getCompatibility(bool poly) => GetOverloadsCompatibilityInfo(explicitTypeArguments: explicitTypeArguments,
argumentsTypes: argumentsTypes,
overloads: overloads,
isPoly: poly);
}