예제 #1
0
    protected TokenImpl ApplyPrecedence(ExpressionCompiler compiler, BinaryToken lhs, LeftHandUnaryToken newToken)
    {
        // If the left-hand side is a binary token, and the new token has a higher precedence,
        // then take the right-hand side from the old left-hand side and use that as the left
        // hand side on the new token. The new token then becomes the right-hand side of the left
        // hand side.
        int lhsPrecedence = compiler.GetPrecedence(lhs.GetType());
        int newPrecedence = compiler.GetPrecedence(newToken.GetType());

        if (newPrecedence < lhsPrecedence)
        {
            newToken.Lhs = lhs.Rhs;
            lhs.Rhs      = newToken;

            return(lhs);
        }
        else
        {
            return(newToken);
        }
    }