Exemple #1
0
        /// <summary>
        /// Reduz a regra.
        /// </summary>
        /// <param name="rule"></param>
        /// <returns></returns>
        private ParseResult Reduce(Rule rule)
        {
            ParseResult reduceEliminated;
            Token       token;

            if (this._trimReductions && rule.ContainsOneNonTerminal)
            {
                token = _tempStack.PopToken();
                token.SetParent(rule.RuleNonTerminal);
                reduceEliminated = ParseResult.ReduceEliminated;
            }
            else
            {
                Reduction reduction = new Reduction();
                reduction.ParentRule = rule;
                _tempStack.PopTokensInto(reduction, rule.SymbolCount);
                token      = new Token();
                token.Data = reduction;
                token.SetParent(rule.RuleNonTerminal);
                this._haveReduction = true;
                reduceEliminated    = ParseResult.ReduceNormal;
            }
            int      state           = _tempStack.PeekToken().State;
            LRAction actionForSymbol = _LalrTables[state].GetActionForSymbol(rule.RuleNonTerminal.TableIndex);

            if (actionForSymbol == null)
            {
                throw new ParserException("Action for LALR state is null");
            }
            token.State = _LalrState = actionForSymbol.Value;
            this._tempStack.PushToken(token);
            return(reduceEliminated);
        }
Exemple #2
0
        /// <summary>
        /// Remove os tokens que estão no topo da pilha e adiciona
        /// a quantidade informada para a redução.
        /// </summary>
        /// <param name="reduction"></param>
        /// <param name="count">Quantidade de itens que serão recuperados,</param>
        public void PopTokensInto(Reduction reduction, int count)
        {
            int index  = _items.Count - count;
            int count2 = _items.Count;

            for (int i = index; i < count2; i++)
            {
                reduction.AddToken(_items[i]);
            }
            _items.RemoveRange(index, count);
        }