Automatic Expression Evaluation (no EOF input from user)

[Timothy Washington]

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Hello all, I've written a shell that implements a grammar (using SableCC3). Now, in the shell, a user who has written an expression has to enter an EOF character for the Parser to begin evaluating that expression. That's annoying as I just want a user to input an expression, press enter and have that expression evaluated.

Now w.r.t. SableCC4, am I understanding correctly that I need to use an explicit lookahead requirement of 'None'? Using the grammar below, how would read expressions from standard input and have the user entering return trigger the parsing of his/her expression. Thanks for any help.


Tokens
    tone = 'q';
    ttwo = 'w';
    tthree = 'e';
    tfour = 'r';

Productions
   
    expr =   {f}    first |
                {s}    second;
   
    first =    {one}    tone |
                {two}    ttwo;
    
    second =     {three} tthree |
                      {four} tfour;

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