public Production(Nonterminal nonterminal, SymbolList symbols, Bools drops, Bools promotes)
{
Id = -1;
Nonterminal = nonterminal;
Symbols = symbols;
Drops = drops;
Promotes = promotes;
//Debug.Assert(!IsPromote);
}
public void AddProductions(params IEnumerable <ProdSymbol>[] symss)
{
foreach (var syms in symss)
{
var symbols = syms.ToList();
var thisSymbols = SymbolList.From(symbols.Select(p => p.Symbol));
var thisDrops = new Bools(symbols.Select(p => p.IsDrop));
var thisPromotes = new Bools(symbols.Select(p => p.IsPromote));
var promotesCount = thisPromotes.Count(p => p);
var dropsCount = thisDrops.Count(d => d);
if (promotesCount > 1)
{
throw new GrammarException($"nonterminal: rule `{Name}´ defines more than on promote");
}
if (promotesCount == 1)
{
if (dropsCount != symbols.Count - 1)
{
throw new GrammarException($"nonterminal: rule `{Name}´ can only promote a single symbol");
}
}
if (symbols.Count > 0 && dropsCount == symbols.Count)
{
throw new GrammarException($"nonterminal: rule `{Name}´ didn't want to drop anything in a row'");
}
foreach (var production in productions)
{
if (production.Symbols.Equals(symbols))
{
var ss = string.Join(" ", symbols.Select(sym => sym.ToString()));
throw new GrammarException($"nonterminal: `{Name}´ rule `{ss}´ already defined before");
}
}
productions.Add(new Production(this, thisSymbols, thisDrops, thisPromotes));
}
}