public override AstNode Visit(AsExpression node)
{
// Begin the node.
builder.BeginNode(node);
// Get the target type and value.
//Expression target = node.GetTarget();
Expression value = node.GetValue();
// Visit them.
//target.Accept(this);
value.Accept(this);
// Get their types.
IChelaType targetType = node.GetNodeType();
IChelaType valueType = value.GetNodeType();
if(targetType != valueType)
Cast(node, value.GetNodeValue(), valueType, targetType, false);
return builder.EndNode();
}
public override AstNode Visit(AsExpression node)
{
// Get the target type and value.
Expression target = node.GetTarget();
Expression value = node.GetValue();
// Visit them.
target.Accept(this);
value.Accept(this);
// The value must be a reference.
IChelaType valueType = value.GetNodeType();
node.SetCoercionType(valueType);
if(!valueType.IsReference())
Error(node, "expected reference value.");
// De-ref the value.
valueType = DeReferenceType(valueType);
if(valueType.IsReference())
node.SetCoercionType(valueType);
// De-ref again.
valueType = DeReferenceType(valueType);
if(!valueType.IsPassedByReference())
Error(node, "expeceted a reference value.");
// Get the target type.
IChelaType targetType = target.GetNodeType();
targetType = ExtractActualType(target, targetType);
if(!targetType.IsPassedByReference())
Error(node, "as operator only can be used with reference types.");
targetType = ReferenceType.Create(targetType);
// TODO: Check if it is possible to perform the cast.
// Set the node type.
node.SetNodeType(targetType);
return node;
}