private void ParseNonterminals(List <string> nonterminalLines)
{
foreach (string line in nonterminalLines)
{
Nonterminal newNonterminal = new Nonterminal(line);
if (startSymbol == null)
{
startSymbol = newNonterminal.identifier;
}
bool alreadyExists = false;
foreach (Nonterminal n in this.nonterminals)
{
if (n.Equals(newNonterminal))
{
n.Combine(newNonterminal);
alreadyExists = true;
break;
}
}
if (!alreadyExists)
{
this.nonterminals.Add(newNonterminal);
}
}
}
public override bool Equals(Object Other)
{
if (Other is Nonterminal)
{
Nonterminal OtherNonterminal = (Nonterminal)Other;
return(this.identifier.Equals(OtherNonterminal.identifier));
}
return(false);
}
private HashSet <LR0Item> ComputeClosure(HashSet <LR0Item> S)
{
HashSet <LR0Item> S2 = new HashSet <LR0Item>(S);
List <LR0Item> toConsider = new List <LR0Item>(S);
int i = 0;
while (i < toConsider.Count)
{
LR0Item item = toConsider[i];
i += 1;
if (!item.DposAtEnd())
{
string sym = item.Rhs[item.Dpos];
Nonterminal n = null;
foreach (Nonterminal nt in this.nonterminals)
{
if (nt.identifier == sym)
{
n = nt;
break;
}
}
if (n != null)
{
foreach (List <string> prod in n.productions)
{
LR0Item item2 = new LR0Item(sym, prod, 0);
if (!S2.Contains(item2))
{
S2.Add(item2);
toConsider.Add(item2);
}
}
}
}
}
return(S2);
}
public void Combine(Nonterminal OtherNonterminal)
{
this.productions.AddRange(OtherNonterminal.productions);
}