private bool InferConstructedType(IType formalType, IType actualType, TypeInference inference)
{
// look for a single occurance of the formal
// constructed type in the actual type's hierarchy
IType constructedActualType = GenericsServices.FindConstructedType(
actualType,
formalType.ConstructedInfo.GenericDefinition);
if (constructedActualType == null)
{
return(false);
}
// Exact inference requires the constructed occurance to be
// the actual type itself
if (inference == TypeInference.Exact && actualType != constructedActualType)
{
return(false);
}
for (int i = 0; i < formalType.ConstructedInfo.GenericArguments.Length; ++i)
{
bool inferenceSuccessful = Infer(
formalType.ConstructedInfo.GenericArguments[i],
constructedActualType.ConstructedInfo.GenericArguments[i],
TypeInference.Exact); // Generic arguments must match exactly, no variance allowed
if (!inferenceSuccessful)
{
return(false);
}
}
return(true);
}
/// <summary>
/// Maps a type involving generic parameters to the corresponding type after substituting concrete
/// arguments for generic parameters.
/// </summary>
/// <remarks>
/// If the source type is a generic parameter, it is mapped to the corresponding argument.
/// If the source type is an open generic type using any of the specified generic parameters, it
/// is mapped to a closed constructed type based on the specified arguments.
/// </remarks>
override public IType MapType(IType sourceType)
{
if (sourceType == _genericSource)
{
return(_constructedOwner as IType);
}
IGenericParameter gp = sourceType as IGenericParameter;
if (gp != null)
{
// Map type parameters declared on our source
if (_map.ContainsKey(gp))
{
return(_map[gp]);
}
// Map type parameters declared on members of our source (methods / nested types)
return(GenericsServices.GetGenericParameters(Map(gp.DeclaringEntity))[gp.GenericParameterPosition]);
}
// TODO: Map nested types
// GenericType[of T].NestedType => GenericType[of int].NestedType
return(base.MapType(sourceType));
}
private bool IsGenericDefinition(IEntity definition)
{
if (GenericsServices.IsGenericMethod(definition) || GenericsServices.IsGenericType(definition))
{
return(true);
}
Errors.Add(CompilerErrorFactory.NotAGenericDefinition(ConstructionNode, definition.FullName));
return(false);
}
private bool IsFullyConstructed()
{
foreach (IType arg in GenericArguments)
{
if (GenericsServices.IsOpenGenericType(arg))
{
return(false);
}
}
return(true);
}
private IEnumerable <IGenericParameter> FindGenericParameters(IType type)
{
foreach (IGenericParameter gp in GenericsServices.FindGenericParameters(type))
{
if (!InferredTypes.ContainsKey(gp))
{
continue;
}
yield return(gp);
}
}
private bool HasCorrectGenerity(IEntity definition)
{
IGenericParameter[] typeParameters = GenericsServices.GetGenericParameters(definition);
if (typeParameters.Length != TypeArguments.Length)
{
Errors.Add(CompilerErrorFactory.GenericDefinitionArgumentCount(ConstructionNode, definition, typeParameters.Length));
return(false);
}
return(true);
}
private bool MaintainsParameterConstraints(IEntity definition)
{
IGenericParameter[] parameters = GenericsServices.GetGenericParameters(definition);
_definition = definition as IType;
bool valid = true;
for (int i = 0; i < parameters.Length; i++)
{
valid &= MaintainsParameterConstraints(parameters[i], TypeArguments[i]);
}
return(valid);
}
private bool HasCorrectGenerity(IEntity definition)
{
IGenericParameter[] typeParameters = GenericsServices.GetGenericParameters(definition);
if (typeParameters.Length != TypeArguments.Length)
{
var error = CompilerErrorFactory.GenericDefinitionArgumentCount(ConstructionNode, definition, typeParameters.Length);
var internalType = definition as IInternalEntity;
if (internalType != null)
{
var node = internalType.Node;
var replacementNode = node["TypeRefReplacement"] as GenericReferenceExpression;
if (replacementNode != null && replacementNode.GenericArguments.Count == typeParameters.Length)
{
error.Data["TypeRefReplacement"] = replacementNode.CloneNode();
throw error;
}
}
Errors.Add(error);
return(false);
}
return(true);
}
protected bool IsFullyConstructed()
{
return(GenericsServices.GetTypeGenerity(this) == 0);
}
