CFGLib.GrammarHelpers.CloneGrammar C# (CSharp) Method

		public static ISet<Production> CloneGrammar(Grammar grammar) {
			return CloneProductions(grammar.Productions);
		}

        /// <summary>
        /// Actually performs the conversion and returns a new CNF grammar based on the old grammar
        /// </summary>
        internal CNFGrammar Convert()
        {
            if (_used)
            {
                throw new Exception("You can only use this object once");
            }
            _used = true;

            var productions = GrammarHelpers.CloneGrammar(_grammar);

            StepStart(productions);
            StepTerm(productions);
            StepBin(productions);
            StepDel(productions);
            StepUnit(productions);

            var resultProductions = new List <Production>();
            //var nonterminalProductions = new List<Production>();
            //var terminalProductions = new List<Production>();
            var producesEmptyWeight = 0.0;

            foreach (var production in productions)
            {
                if (production.Rhs.Count > 2)
                {
                    throw new Exception("Didn't expect more than 2");
                }
                else if (production.Rhs.Count == 2)
                {
                    resultProductions.Add(production);
                }
                else if (production.Rhs.Count == 1)
                {
                    var rhs = production.Rhs[0];
                    if (rhs.IsNonterminal)
                    {
                        throw new Exception("Didn't expect unit production");
                    }
                    resultProductions.Add(production);
                }
                else if (production.Rhs.Count == 0)
                {
                    producesEmptyWeight += production.Weight;
                    // GetGrammarFromProductionList(production, productions);
                }
            }

            resultProductions.Add(new Production(_startSymbol, new Sentence(), producesEmptyWeight));

            return(new CNFGrammar(resultProductions, _startSymbol));
        }