public GrammarNodeD AddAfter(NonterminalHeadD nonterminalHeadD, GrammarNodeV target, VADG.Global.SymbolType symbolType)
{
GrammarNodeDAddAfterVisitor visitor = new GrammarNodeDAddAfterVisitor();
visitor.Target = target.getReference();
visitor.SymbolType = symbolType;
visitor.visit(nonterminalHeadD);
return visitor.Item;
}
public GrammarNodeD AddBefore(NonterminalHeadD nonterminalHeadD, GrammarNodeV grammarNodeV, VADG.Global.SymbolType symbolType)
{
GrammarNodeDAddBeforeVisitor visitor = new GrammarNodeDAddBeforeVisitor();
visitor.Target = grammarNodeV.getReference();
visitor.SymbolType = symbolType;
visitor.visit(nonterminalHeadD);
return visitor.Item;
}
private void Delete(GrammarNodeV itemToDelete)
{
model.Functions.Delete(itemToDelete.getReference());
// if deleting a rule, check it's not the last time it's ever used (poor rule :( )
GrammarNodeD grammarNodeD = itemToDelete.getReference();
if (grammarNodeD is NonterminalTailD)
{
NonterminalTailD nontTail = grammarNodeD as NonterminalTailD;
String ruleName = nontTail.Reference.Name;
// traverse from the startsymbol through the grammar
// if we never find this rule used, offer to remove the rule from the definitive grammar
GrammarNodeDExistsVisitor visitor = new GrammarNodeDExistsVisitor(ruleName, VADG.Global.SymbolType.Nonterminal);
model.DefinitiveGrammar.StartSymbol.accept(visitor);
if (!visitor.Found)
{
if (OfferDeleteRule != null)
OfferDeleteRule(nontTail.Reference);
}
}
view.Functions.Delete(itemToDelete);
ReDraw();
}
public void Delete(GrammarNodeV itemToDelete)
{
GrammarNodeVDeleteVisitor visitor = new GrammarNodeVDeleteVisitor(itemToDelete.getReference());
startSymbol.accept(visitor);
}