public void appendChildV(GrammarNodeV child)
{
if (child is NonterminalHeadV)
throw new Exception("An operations children must not be of type NonterminalHeadV.");
children.Add(child);
}
public void visit(UndefinedD undefinedD)
{
UndefinedV undefinedV = new UndefinedV(undefinedD, level + 1);
undefinedD.References.Add(undefinedV);
current = undefinedV;
}
public void visit(TerminalD terminalD)
{
// set current, ready for parent
TerminalV terminalV = new TerminalV(terminalD, level + 1);
terminalD.References.Add(terminalV);
current = terminalV;
}
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;
}
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 void insertChildV(int position, GrammarNodeV child)
{
if (child is NonterminalHeadV)
throw new Exception("An operations children must not be of type NonterminalHeadV.");
if (position < 0)
throw new Exception("The position was less than zero, cmon, sharpen up!");
if (position > children.Count)
throw new Exception("The position was greater than the children array");
// do it!
if (position == children.Count)
appendChildV(child);
else
children.Insert(position, child);
}
public void visit(NonterminalHeadD nonterminalHeadD)
{
//this is the start of the visit, we create a nonterminalheadV - note one in grammar
// if this is called again then something has gone wrong
if (current != null)
throw new Exception("You should only be calling visit on a NonterminalHeadD node once when creating a visualised grammar. Also use the visitor pattern once, then re-initialize");
// visit rule
nonterminalHeadD.Rule.accept(this);
// current should now be a ChoiceLineV with the rest of the visualised grammar
NonterminalHeadV startSymbolV = nonterminalHeadD.CreateNonterminalHeadV();
if (!(current is ChoiceLineV))
throw new Exception("the current node is not of type ChoiceLineV, is the definitive grammar constructed properly?");
startSymbolV.Rule = (ChoiceLineV)current;
current = startSymbolV;
}
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 visit(ConcatenationD concatenationD)
{
List<GrammarNodeV> children = new List<GrammarNodeV>();
foreach (GrammarNodeD child in concatenationD.Children)
{
// make children
child.accept(this);
children.Add(current);
}
ConcatenationV concatenationV = new ConcatenationV(children, concatenationD);
concatenationD.AddReference(concatenationV);
current = concatenationV;
}
public void visit(NonterminalTailD nonterminalTailD)
{
NonterminalTailV nonterminalTailV = new NonterminalTailV(nonterminalTailD, level + 1);
nonterminalTailD.AddReference(nonterminalTailV);
current = nonterminalTailV;
}
public void visit(ChoiceD choiceD)
{
List<GrammarNodeV> children = new List<GrammarNodeV>();
foreach (GrammarNodeD child in choiceD.Children)
{
// make children
child.accept(this);
children.Add(current);
}
ChoiceV choiceV = new ChoiceV(children, choiceD);
choiceD.AddReference(choiceV);
current = choiceV;
}
public GrammarNodeVAddBeforeVisitor(GrammarNodeV targetIn, GrammarNodeD itemIn)
{
target = targetIn;
item = itemIn;
}
public GrammarNodeVAddAfterVisitor(GrammarNodeV targetIn, GrammarNodeD itemIn)
{
target = targetIn;
item = itemIn;
}
public void Delete(GrammarNodeV itemToDelete)
{
GrammarNodeVDeleteVisitor visitor = new GrammarNodeVDeleteVisitor(itemToDelete.getReference());
startSymbol.accept(visitor);
}
