private IEntity[] FindExtension(IType fromType, string name)
{
IEntity extension = _context.NameResolutionService.ResolveExtension(fromType, name);
if (null == extension)
{
return(Ambiguous.NoEntities);
}
Ambiguous a = extension as Ambiguous;
if (null != a)
{
return(a.Entities);
}
return(new IEntity[] { extension });
}
/// <summary>
/// Constructs generic entities out of an ambiguous definition.
/// </summary>
private IEntity ConstructAmbiguousEntity(Ambiguous ambiguousDefinition, Node constructionNode, TypeReferenceCollection argumentNodes)
{
GenericConstructionChecker checker = new GenericConstructionChecker(
TypeSystemServices,
constructionNode,
argumentNodes,
new CompilerErrorCollection());
List <IEntity> matches = new List <IEntity>(ambiguousDefinition.Entities);
// Filter matches by genericness, generity and constraints
Predicate <IEntity>[] filters = new Predicate <IEntity>[] {
checker.NotGenericDefinition,
checker.IncorrectGenerity,
checker.ViolatesParameterConstraints
};
foreach (Predicate <IEntity> filter in filters)
{
checker.Errors.Clear();
matches.RemoveAll(filter);
// If no matches pass the filter, record the first error only
// (providing all the distinct errors that occured would be superfluous)
if (matches.Count == 0)
{
Errors.Add(checker.Errors[0]);
return(TypeSystemServices.ErrorEntity);
}
// If only one match passes the filter, continue construction normally
if (matches.Count == 1)
{
return(ConstructEntity(matches[0], constructionNode, argumentNodes));
}
}
// Several matches have passed the filter -
// construct all of them and return another Ambiguous entity
IEntity[] constructed = Array.ConvertAll <IEntity, IEntity>(
matches.ToArray(),
delegate(IEntity def) { return(ConstructEntity(def, constructionNode, argumentNodes)); });
return(new Ambiguous(constructed));
}
public static IEntity GetEntityFromList(IList list)
{
IEntity element = null;
if (list.Count > 0)
{
if (list.Count > 1)
{
element = new Ambiguous(list);
}
else
{
element = (IEntity)list[0];
}
list.Clear();
}
return(element);
}
private IEntity ResolveAmbiguousLValue(Expression sourceNode, Ambiguous candidates, Expression rvalue)
{
if (!candidates.AllEntitiesAre(EntityType.Property)) return null;
IEntity[] entities = candidates.Entities;
IEntity[] getters = GetSetMethods(entities);
ExpressionCollection args = new ExpressionCollection();
args.Add(rvalue);
IEntity found = GetCorrectCallableReference(sourceNode, args, getters);
if (null != found && EntityType.Method == found.EntityType)
{
IProperty property = (IProperty)entities[GetIndex(getters, found)];
BindProperty(sourceNode, property);
return property;
}
return null;
}
private IEntity ResolveCallableReference(MethodInvocationExpression node, Ambiguous entity)
{
IEntity resolved = CallableResolutionService.ResolveCallableReference(node.Arguments, entity.Entities);
if (null == resolved)
return null;
IMember member = (IMember)resolved;
if (NodeType.ReferenceExpression == node.Target.NodeType)
{
ResolveMemberInfo((ReferenceExpression)node.Target, member);
}
else
{
Bind(node.Target, member);
BindExpressionType(node.Target, member.Type);
}
return resolved;
}
private List<IEntity> GetMatchesByGenericity(ReferenceExpression node, Ambiguous candidates)
{
bool isGenericReference = (node.ParentNode is GenericReferenceExpression);
List<IEntity> matches = new List<IEntity>();
foreach (IEntity candidate in candidates.Entities)
{
IType type = candidate as IType;
bool isGenericType = (type != null && type.GenericInfo != null);
if (isGenericType == isGenericReference)
{
matches.Add(candidate);
}
}
return matches;
}
IEntity ResolveMacroExtensionType(MacroStatement node, Ambiguous extensions)
{
if (null == extensions)
return null;
foreach (var entity in extensions.Entities)
{
var extensionType = ResolveMacroExtensionType(node, entity as IMethod);
if (null != extensionType)
return extensionType;
}
return null;
}
/// <summary>
/// Constructs generic entities out of an ambiguous definition.
/// </summary>
private IEntity ConstructAmbiguousEntity(Node constructionNode, Ambiguous ambiguousDefinition, IType[] typeArguments)
{
GenericConstructionChecker checker = new GenericConstructionChecker(
TypeSystemServices,
constructionNode,
typeArguments,
new CompilerErrorCollection());
List<IEntity> matches = new List<IEntity>(ambiguousDefinition.Entities);
// Filter matches by genericness, generity and constraints
Predicate<IEntity>[] filters = new Predicate<IEntity>[] {
checker.NotGenericDefinition,
checker.IncorrectGenerity,
checker.ViolatesParameterConstraints };
foreach (Predicate<IEntity> filter in filters)
{
checker.Errors.Clear();
matches.RemoveAll(filter);
// If no matches pass the filter, record the first error only
// (providing all the distinct errors that occured would be superfluous)
if (matches.Count == 0)
{
Errors.Add(checker.Errors[0]);
return TypeSystemServices.ErrorEntity;
}
// If only one match passes the filter, continue construction normally
if (matches.Count == 1)
{
return ConstructEntity(constructionNode, matches[0], typeArguments);
}
}
// Several matches have passed the filter -
// construct all of them and return another Ambiguous entity
IEntity[] constructed = Array.ConvertAll<IEntity, IEntity>(
matches.ToArray(),
delegate(IEntity def) { return ConstructEntity(constructionNode, def, typeArguments); });
return new Ambiguous(constructed);
}
private IEntity ResolveAmbiguousTypeReference(ReferenceExpression node, Ambiguous candidates)
{
List<IEntity> matches = GetMatchesByGenericity(node, candidates);
if (matches.Count > 1)
{
PreferInternalEntitiesOverNonInternal(matches);
}
if (matches.Count == 1)
{
Bind(node, matches[0]);
}
else
{
Bind(node, new Ambiguous(matches));
}
return node.Entity;
}
public static IEntity GetEntityFromList(IList list)
{
IEntity element = null;
if (list.Count > 0)
{
if (list.Count > 1)
{
element = new Ambiguous(list);
}
else
{
element = (IEntity)list[0];
}
list.Clear();
}
return element;
}
private IEntity ResolveAmbiguousMethodReference(ReferenceExpression node, Ambiguous candidates, ExpressionCollection args)
{
//BOO-656
if (!AstUtil.IsTargetOfMethodInvocation(node)
&& !AstUtil.IsTargetOfSlicing(node)
&& !node.IsTargetOfAssignment())
{
return candidates.Entities[0];
}
return candidates;
}
private IEntity ResolveAmbiguousReference(ReferenceExpression node, Ambiguous candidates)
{
var resolved = ResolveAmbiguousReferenceByAccessibility(candidates);
var accessibleCandidates = resolved as Ambiguous;
if (accessibleCandidates == null || AstUtil.IsTargetOfSlicing(node) || node.IsTargetOfAssignment())
return resolved;
if (accessibleCandidates.AllEntitiesAre(EntityType.Property))
return ResolveAmbiguousPropertyReference(node, accessibleCandidates, EmptyExpressionCollection);
if (accessibleCandidates.AllEntitiesAre(EntityType.Method))
return ResolveAmbiguousMethodReference(node, accessibleCandidates, EmptyExpressionCollection);
if (accessibleCandidates.AllEntitiesAre(EntityType.Type))
return ResolveAmbiguousTypeReference(node, accessibleCandidates);
return resolved;
}
private IEntity ResolveAmbiguousTypeReference(ReferenceExpression node, Ambiguous candidates)
{
bool isGenericReference = (node.ParentNode is GenericReferenceExpression);
List matches = new List();
foreach (IEntity candidate in candidates.Entities)
{
IType type = candidate as IType;
bool isGenericType = (type != null && type.GenericInfo != null);
if (isGenericType == isGenericReference)
{
matches.Add(candidate);
}
}
if (matches.Count == 1)
{
Bind(node, (IEntity)matches[0]);
}
else
{
Bind(node, new Ambiguous(matches));
}
return node.Entity;
}
private IEntity ResolveAmbiguousReferenceByAccessibility(Ambiguous candidates)
{
List newEntities = new List();
foreach (IEntity entity in candidates.Entities)
{
if (!IsInaccessible(entity))
{ newEntities.Add(entity); }
}
if (newEntities.Count == 1)
{ return (IEntity)newEntities[0]; }
return new Ambiguous(newEntities);
}
private IEntity ResolveAmbiguousReference(ReferenceExpression node, Ambiguous candidates)
{
if (!AstUtil.IsTargetOfSlicing(node)
&& !AstUtil.IsLhsOfAssignment(node))
{
if (candidates.AllEntitiesAre(EntityType.Property))
{
return ResolveAmbiguousPropertyReference(node, candidates, EmptyExpressionCollection);
}
else if (candidates.AllEntitiesAre(EntityType.Method))
{
return ResolveAmbiguousMethodReference(node, candidates, EmptyExpressionCollection);
}
else if (candidates.AllEntitiesAre(EntityType.Type))
{
return ResolveAmbiguousTypeReference(node, candidates);
}
}
return ResolveAmbiguousReferenceByAccessibility(candidates);
}
private IEntity ResolveAmbiguousExtension(MethodInvocationExpression node, Ambiguous ambiguous)
{
IEntity resolved = ResolveCallableReference(node, ambiguous);
if (null != resolved) return resolved;
return CantResolveAmbiguousMethodInvocation(node, ambiguous.Entities);
}
protected virtual IEntity ResolveAmbiguousMethodInvocation(MethodInvocationExpression node, Ambiguous entity)
{
_context.TraceVerbose("{0}: resolving ambigous method invocation: {1}", node.LexicalInfo, entity);
IEntity resolved = ResolveCallableReference(node, entity);
if (null != resolved) return resolved;
if (TryToProcessAsExtensionInvocation(node)) return null;
return CantResolveAmbiguousMethodInvocation(node, entity.Entities);
}
private IEntity ResolveAmbiguousPropertyReference(ReferenceExpression node, Ambiguous candidates, ExpressionCollection args)
{
IEntity[] entities = candidates.Entities;
IEntity[] getters = GetGetMethods(entities);
IEntity found = GetCorrectCallableReference(node, args, getters);
if (null != found && EntityType.Method == found.EntityType)
{
IProperty property = (IProperty)entities[GetIndex(getters, found)];
BindProperty(node, property);
return property;
}
return candidates;
}
private IEntity AmbiguousReference(SimpleTypeReference node, Ambiguous entity)
{
_context.Errors.Add(CompilerErrorFactory.AmbiguousReference(node, node.Name, entity.Entities));
return(TypeSystemServices.ErrorEntity);
}
private IEntity ResolveAmbiguousReferenceByAccessibility(Ambiguous candidates)
{
var newEntities = new List<IEntity>();
foreach (IEntity entity in candidates.Entities)
if (!IsInaccessible(entity))
newEntities.Add(entity);
return Entities.EntityFromList(newEntities);
}
private IEntity MapAmbiguousEntity(Ambiguous source)
{
// Map each individual entity in the ambiguous list
return new Ambiguous(Array.ConvertAll<IEntity, IEntity>(source.Entities, Map));
}
private IEntity ResolveCallableReference(MethodInvocationExpression node, Ambiguous entity)
{
var genericService = My<GenericsServices>.Instance;
var methods = entity.Entities
.OfType<IMethod>()
.Select(m => {
if (m.GenericInfo == null)
return m;
var inferrer = new GenericParameterInferrer(Context, m, node.Arguments);
inferrer.ResolveClosure += ProcessClosureInMethodInvocation;
if (!inferrer.Run())
return null;
var arguments = inferrer.GetInferredTypes();
if (arguments == null || !genericService.CheckGenericConstruction(m, arguments))
return null;
return m.GenericInfo.ConstructMethod(arguments);
}).Where(m => m != null).ToArray();
var resolved = CallableResolutionService.ResolveCallableReference(node.Arguments, methods);
if (null == resolved)
return null;
IMember member = (IMember)resolved;
if (NodeType.ReferenceExpression == node.Target.NodeType)
{
ResolveMemberInfo((ReferenceExpression)node.Target, member);
}
else
{
Bind(node.Target, member);
BindExpressionType(node.Target, member.Type);
}
return resolved;
}
private IEntity AmbiguousReference(SimpleTypeReference node, Ambiguous entity)
{
_context.Errors.Add(CompilerErrorFactory.AmbiguousReference(node, node.Name, entity.Entities));
return TypeSystemServices.ErrorEntity;
}