IEnumerable <Production> EliminateNullables(Nonterminal v, HashSet <Nonterminal> nullables)
{
/*foreach (var p in this.productionMap[v])
* {
* if (p.Rhs.Length == 0)
* yield break;
*
* foreach (var symbols in EnumerateNullableFreeVariations(ConsList<GrammarSymbol>.Create(p.Rhs), nullables))
* if (symbols != null) //ignore the case when all nullables were replaced
* yield return new Production(v, symbols.ToArray());
* }*/
var res = new Dictionary <string, Production>();
foreach (var p in this.productionMap[v])
{
if (p.Rhs.Length == 0)
{
continue;
}
foreach (var symbols in EnumerateNullableFreeVariations(ConsList <GrammarSymbol> .Create(p.Rhs), nullables))
{
if (symbols != null)
{//ignore the case when all nullables were replaced
var newProd = new Production(v, symbols.ToArray());
res[newProd.Description] = newProd;
}
}
}
return(res.Values);
}
public override STModel Convert(iterexpr ie, Symtab stab)
{
VarInfo I = new VarInfo(stb, stab, ie, charsort);
var iterCases = ConsList <itercase> .Create(ie.GetNormalCases());
var endCases = ConsList <itercase> .Create(ie.GetEndCases());
BranchingRule <Expr> rule = CreateBranchingRule(iterCases, stb.Solver.True, I);
BranchingRule <Expr> frule = CreateBranchingRule(endCases, stb.Solver.True, I);
STModel st = new STModel(stb.Solver, "iterSTb", charsort, charsort, I.regSort, I.initReg, 0);
st.AssignRule(0, rule);
st.AssignFinalRule(0, frule);
return(st);
}
IEnumerable <Production> EliminateNullables(Nonterminal v, HashSet <Nonterminal> nullables)
{
foreach (var p in this.productionMap[v])
{
if (p.Rhs.Length == 0)
{
yield break;
}
foreach (var symbols in EnumerateNullableFreeVariations(ConsList <GrammarSymbol> .Create(p.Rhs), nullables))
{
if (symbols != null) //ignore the case when all nullables were replaced
{
yield return(new Production(v, symbols.ToArray()));
}
}
}
}
