private void VisitNode(LocalVariableDeclarationStatement node)
{
AbstractNode typeSpecifier = node.Child;
AbstractNode localVariableDeclarators = typeSpecifier.Sib;
typeSpecifier.Accept(this);
TypeDescriptor declType = typeSpecifier.TypeDescriptor;
AbstractNode identifier = localVariableDeclarators.Child;
while (identifier != null)
{
Identifier id = (Identifier)identifier;
if (Table.isDeclaredLocally(id.ID))
{
id.TypeDescriptor = new ErrorDescriptor("Symbol table " +
"already contains id: " + id.ID);
id.AttributesRef = null;
}
else
{
VariableDeclarationAttributes attr =
new VariableDeclarationAttributes();
attr.Kind = Kind.VariableAttributes;
attr.TypeDescriptor = declType;
attr.IsAssignable = true;
attr.Modifiers = null;
Table.enter(id.ID, attr);
id.TypeDescriptor = declType;
id.AttributesRef = attr;
}
identifier = identifier.Sib;
}
}
private void VisitNode(FieldVariableDeclaration node)
{
AbstractNode modifiers = node.Child;
AbstractNode typeSpecifier = modifiers.Sib;
AbstractNode fieldVarDecls = typeSpecifier.Sib;
typeSpecifier.Accept(TypeVisitor);
TypeDescriptor declType = typeSpecifier.TypeDescriptor;
List <ModifiersEnums> modifiersList =
((Modifiers)modifiers).ModifierTokens;
// note: grammar doesn't allow initialization at declaration
// add each identifier in the list to the symbol table
AbstractNode fieldVarDeclName = fieldVarDecls.Child;
while (fieldVarDeclName != null)
{
Identifier identifier = fieldVarDeclName.Child as Identifier;
if (identifier == null)
{
string msg = "Expected Identifier type, found " +
nameof(identifier);
fieldVarDeclName.Child.TypeDescriptor =
new ErrorDescriptor(msg);
}
else
{
string id = identifier.ID;
// if variable already declared locally, assign an error
if (Table.isDeclaredLocally(id))
{
identifier.TypeDescriptor = new ErrorDescriptor(
"Variable name cannot be redeclared: " + id);
identifier.AttributesRef = null;
}
else
{
VariableDeclarationAttributes attr =
new VariableDeclarationAttributes();
attr.Kind = Kind.VariableAttributes;
attr.TypeDescriptor = identifier.TypeDescriptor;
attr.Modifiers = modifiersList;
attr.IsAssignable = true;
Table.enter(id, attr);
identifier.TypeDescriptor = declType;
identifier.AttributesRef = attr;
}
}
fieldVarDeclName = fieldVarDeclName.Sib;
}
VisitChildren(node);
}
