Re: How to add "error"

[Hans Aberg]

On 11 Apr 2007, at 00:17, Tamas Nagy wrote:

> I cannot understand something:
> how to add error when "empty" is allowed
>
> Nodes:  Apple
>       | Pear
>       |  /* empty */
>
> Then how to add 'error' to the above rule?
>
>  Nodes:  Apple
>       | Pear
>       |  /* empty */
>       |  error     { printf("Error") }   ?????

I think you will have to experiment, to see what seems to give good  
results. Error reporting and recovery is somewhat unpredictable due  
to the nature of the LALR(1) parsing generation algorithm that Bison  
uses.

  Hans Aberg