コード例 #1
0
        public IParseTreeValue Evaluate(IParseTreeValue LHS, IParseTreeValue RHS, string opSymbol)
        {
            if (!(IsSupportedSymbol(opSymbol)))
            {
                throw new ArgumentException($"Unsupported operation ({opSymbol}) passed to Evaluate function");
            }

            if (opSymbol.Equals(LogicalOperators.NOT))
            {
                throw new ArgumentException($"Unary operator ({opSymbol}) passed to binary Evaluate function");
            }

            var opProvider = new OperatorTypesProvider((LHS.ValueType, RHS.ValueType), opSymbol);

            if (opProvider.IsMismatch)
            {
                return(_valueFactory.CreateMismatchExpression($"{LHS.Token} {opSymbol} {RHS.Token}", Tokens.Variant));
            }

            if (ArithmeticOperators.Includes(opSymbol))
            {
                return(EvaluateArithmeticOp(opSymbol, LHS, RHS));
            }

            if (RelationalOperators.Includes(opSymbol))
            {
                return(EvaluateRelationalOp(opSymbol, LHS, RHS));
            }

            return(EvaluateLogicalOperator(opSymbol, LHS, RHS));
        }
コード例 #2
0
 private bool IsSupportedSymbol(string opSymbol)
 {
     return(ArithmeticOperators.Includes(opSymbol) ||
            RelationalOperators.Includes(opSymbol) ||
            LogicalOperators.Incudes(opSymbol));
 }