Re: defined YYERROR_VERBOSE, but still got only "parse error"

s_gherman@yahoo.com (Sorin Gherman) wrote:


>Hi,
>This is my first time using Bison and I run into the following
>problem: I defined YYERROR_VERBOSE (and confirmed it is defined into
>the generated .c file by inserting a printf there) but I still got
>only the usual "parse error" message when an error occurs.
>
>I've looked into the code that actully generates the error message:
>if (count < 5)
>{
> count = 0;
> for (x = (yyn < 0 ? -yyn : 0);
> x < (sizeof(yytname) / sizeof(char *)); x++)
> if (yycheck[x + yyn] == x)
> {
> strcat(msg, count == 0 ? ", expecting `" : " or `");
> strcat(msg, yytname[x]);
> strcat(msg, "'");
> count++;
> }
>}
>
>
>and found out that count == 5 from the beginning; replacing
>if (count < 5)
>with
>if (1)
>resulted in an informative error message ("expected" ... "or" ...).
>
>What's the problem? Do I need to set up other variables as well, or
>what?


          5 isn't less than 5.


          If count==5, then count<5 is FALSE. You changed the semantics.


Sincerely,


Gene Wirchenko


Computerese Irregular Verb Conjugation:
          I have preferences.
          You have biases.
          He/She has prejudices.

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