public override AstNode Visit(MemberAccess node)
{
// Evaluate the base reference.
Expression baseReference = node.GetReference();
baseReference.SetHints(node.Hints);
baseReference.Accept(this);
// Get the base reference type.
IChelaType baseRefType = baseReference.GetNodeType();
if(baseRefType.IsConstant())
baseRefType = DeConstType(baseRefType);
// Set a default coercion type.
node.SetCoercionType(baseRefType);
// Get the scope.
Scope scope = null;
bool canStatic = true;
bool canNoStatic = node.HasHints(Expression.MemberHint);
bool suppressVirtual = false;
bool implicitThis = false;
if(baseRefType.IsMetaType())
{
// Read the base reference type.
baseRefType = ExtractActualType(node, baseRefType);
// Handle incomplete types.
if(baseRefType.IsIncompleteType())
{
node.SetNodeType(baseRefType);
return node;
}
// Handle built-in types
if(!baseRefType.IsStructure() && !baseRefType.IsClass() && !baseRefType.IsInterface())
{
baseRefType = currentModule.GetAssociatedClass(baseRefType);
if(baseRefType == null)
Error(node, "expected a known type.");
}
scope = (Scope) baseRefType;
suppressVirtual = true;
// Get the current container scope.
Scope contScope = currentScope;
while(contScope != null && (contScope.IsPseudoScope() || contScope.IsFunction() || contScope.IsLexicalScope()))
contScope = contScope.GetParentScope();
// Check if the base type is a base of me.
Structure building = contScope as Structure;
if(building != null)
{
Structure scopeBuilding = (Structure) baseRefType;
if(building.IsDerivedFrom(scopeBuilding))
{
canNoStatic = true;
implicitThis = true;
}
}
}
else if(baseRefType.IsNamespace())
{
scope = (Namespace) baseReference.GetNodeValue();
}
else if(baseRefType.IsReference())
{
canStatic = false;
canNoStatic = true;
// Get the variable referenced type.
ReferenceType refType = (ReferenceType)baseRefType;
IChelaType objectType = refType.GetReferencedType();
if(objectType.IsReference())
{
// Set the variable type as the coercion type.
node.SetCoercionType(objectType);
// Dereference.
refType = (ReferenceType)objectType;
objectType = refType.GetReferencedType();
}
else if(objectType.IsStructure())
{
// Use the structure type as the coercion type.
node.SetCoercionType(objectType);
}
else if(objectType.IsPrimitive() || objectType.IsVector() ||
objectType.IsPlaceHolderType())
{
node.SetCoercionType(objectType);
}
if(objectType.IsStructure() || objectType.IsClass() || objectType.IsInterface() ||
objectType.IsTypeInstance())
scope = (Scope)objectType;
else if(objectType.IsPlaceHolderType())
scope = new PseudoScope((PlaceHolderType)objectType);
else
{
scope = currentModule.GetAssociatedClass(objectType);
if(scope == null)
Error(node, "unimplemented primitive type classes.");
}
}
else if(baseRefType.IsStructure())
{
canStatic = false;
canNoStatic = true;
scope = (Scope)baseRefType;
}
else if(baseRefType.IsPrimitive())
{
canStatic = false;
canNoStatic = true;
scope = currentModule.GetAssociatedClass(baseRefType);
if(scope == null)
Error(node, "unimplemented primitive type classes.");
}
else if(baseRefType.IsVector())
{
canStatic = false;
canNoStatic = true;
scope = currentModule.GetAssociatedClass(baseRefType);
if(scope == null)
Error(node, "unimplemented vector type classes.");
}
else if(baseRefType.IsPlaceHolderType())
{
canStatic = false;
canNoStatic = true;
scope = new PseudoScope((PlaceHolderType)baseRefType);
}
else
{
Error(node, "expected reference, namespace, struct, class, primitive, vector.");
}
// Check vectorial swizzle.
IChelaType coercionType = node.GetCoercionType();
if(coercionType.IsVector())
{
VectorType vectorType = (VectorType)coercionType;
int minSize = 0;
int mask = 0;
string fieldName = node.GetName();
if(fieldName.Length <= 4)
{
// It can be a vectorial swizzle
bool isSwizzle = true;
for(int i = 0; i < fieldName.Length; ++i)
{
switch(fieldName[i])
{
case 'x':
case 'r':
case 's':
mask |= 0<<(2*i);
if(minSize < 1)
minSize = 1;
break;
case 'y':
case 'g':
case 't':
mask |= 1<<(2*i);
if(minSize < 2)
minSize = 2;
break;
case 'z':
case 'b':
case 'p':
mask |= 2<<(2*i);
if(minSize < 3)
minSize = 3;
break;
case 'w':
case 'a':
case 'q':
mask |= 3<<(2*i);
if(minSize < 4)
minSize = 4;
break;
default:
i = fieldName.Length + 1;
isSwizzle = false;
break;
}
}
// Swizzle found.
if(isSwizzle)
{
// Check the validity.
if(minSize > vectorType.GetNumComponents())
Error(node, "accessing inexistent elements in the vector.");
// Store the base variable.
Variable baseVar = baseReference.GetNodeValue() as Variable;
// Return the swizzle.
IChelaType swizzleType = VectorType.Create(vectorType.GetPrimitiveType(), fieldName.Length);
SwizzleVariable swizzleVar =
new SwizzleVariable(swizzleType, baseVar, (byte)mask, fieldName.Length);
node.SetNodeValue(swizzleVar);
node.SetNodeType(ReferenceType.Create(swizzleType));
return node;
}
}
}
// Find the scope member.
ScopeMember member = scope.FindMemberRecursive(node.GetName());
if(member == null)
{
// Check attribute name.
if(node.IsAttributeName())
member = scope.FindMemberRecursive(node.GetName() + "Attribute");
if(member == null)
Error(node, "couldn't find member '" + node.GetName()
+ "' in '" + scope.GetFullName() + "'.");
}
// Check the accesiblity.
CheckMemberVisibility(node, member);
// Return it.
IChelaType type = null;
if(member.IsNamespace())
{
type = ChelaType.GetNamespaceType();
}
else if(member.IsType())
{
type = MetaType.Create((IChelaType)member);
}
else if(member.IsTypeName())
{
// Read the type name.
TypeNameMember typeName = (TypeNameMember)member;
type = typeName.GetActualType();
// Create an incomplete type if necessary.
if(type == null)
type = new IncompleteType(typeName);
type = MetaType.Create(type);
}
else if(member.IsFunctionGroup())
{
FunctionGroup fgroup = (FunctionGroup)member;
FunctionGroupSelector selector = new FunctionGroupSelector(fgroup);
selector.SuppressVirtual = suppressVirtual;
selector.ImplicitThis = implicitThis;
member = selector;
if(canNoStatic && canStatic)
type = ChelaType.GetAnyFunctionGroupType();
else if(canStatic)
type = ChelaType.GetStaticFunctionGroupType();
else
type = ChelaType.GetFunctionGroupType();
}
else if(member.IsFunction())
{
Function function = (Function)member;
type = function.GetFunctionType();
// Check the static flag.
if(!canNoStatic &&
(function.GetFlags() & MemberFlags.InstanceMask) != MemberFlags.Static)
{
Error(node, "expected a static function.");
}
else if(function.IsMethod())
{
Method method = (Method)function;
node.SetSlot(method.GetVSlot());
}
}
else
{
Variable variable = (Variable)member;
IChelaType variableType = variable.GetVariableType();
if(variableType.IsPassedByReference())
variableType = ReferenceType.Create(variableType); // Required for nested access.
type = ReferenceType.Create(variableType);
// Check the static flag.
if(!canNoStatic && !variable.IsStatic())
{
Error(node, "expected a static variable.");
}
else if(variable.IsField())
{
// Use the slot.
FieldVariable field = (FieldVariable) variable;
node.SetSlot(field.GetSlot());
}
else if(variable.IsProperty() && !variable.IsStatic() && suppressVirtual)
{
// Wrap the property in a direct property slot.
member = new DirectPropertySlot((PropertyVariable)variable);
}
// Store the implicit this property.
if(!variable.IsStatic())
node.ImplicitSelf = implicitThis;
}
// Set the value.
node.SetNodeValue(member);
// Set the type.
node.SetNodeType(type);
return node;
}
