private void BubblingProcessNode(SyntaxTreeNode node)
{
if (node.Value is Nonterminal)
{
Nonterminal nonterminal = node.Value as Nonterminal;
if (nonterminal.Equals(MyNonterminals.ASSIGN_STATEMENT) && node.ChildrenCount == 4)
{
var idToken = (node[1].Value as ConcreteTerminal).Token;
string defVariableName = idToken.Value;
if (!_defindedVariables.Contains(defVariableName))
{
_defindedVariables.Add(defVariableName);
}
else
{
_errors.Add(new Error(idToken, ErrorKind.Semantic, "Variable redefinition"));
}
}
}
else
{
ConcreteTerminal terminal = node.Value as ConcreteTerminal;
if (terminal.Token.HasType(TokenType.Identifier) && !_defindedVariables.Contains(terminal.Token.Value))
{
if (((Nonterminal)node.Parent.Value).Equals(MyNonterminals.FACTOR))
{
_errors.Add(new Error(terminal.Token, ErrorKind.Semantic, "Undefined variable"));
}
}
}
}
