public override void Visit(AST_kary node)
{
int children = node.NumChildren;
switch (node.Tag)
{
case NodeType.UsingList:
for (int i = 0; i < children; i++)
{
if (((AST_leaf)node[i]).Sval != "CbRuntime")
{
ReportError(node[0].LineNumber, "Invalid using identifier: '{0}' (only allowed identifier is CbRuntime)", ((AST_leaf)node[i]).Sval);
}
}
break;
case NodeType.DeclList:
for (int i = 0; i < children; i++)
{
node[i].Accept(this);
}
break;
case NodeType.FieldList:
// already handled by prePass
break;
case NodeType.IdList:
// already handled in NodeType.LocalDecl
break;
case NodeType.Formals:
// visit all statements
for (int i = 0; i < children; i++)
{
node[i].Accept(this);
}
break;
case NodeType.Block:
// change scope
localSymbols.Enter();
// accept all statements
for (int i = 0; i < children; i++)
{
node[i].Accept(this);
}
// change scope
localSymbols.Exit();
break;
case NodeType.Actuals:
node.Type = CbType.Void;
// visit all parameters
for (int i = 0; i < children; i++)
{
node[i].Accept(this);
if (node[i].Type == CbType.Error)
{
node.Type = CbType.Error;
}
}
break;
case NodeType.Return:
node.Type = CbType.Void;
if (node.NumChildren > 0)
{
node[0].Accept(this);
node.Type = node[0].Type;
}
break;
default:
throw new Exception("{0} is not a tag compatible with an AST_kary node");
}
}
