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Home > Forums > Programmers > Languages > C Forum

grammar bison(yacc) question

thread205-1276251
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homeless (Programmer)
8 Sep 06 9:12
i try to catch the error position, and give out in an error File:


stmnts:   primary_terminal exp '\n'      {/* read something...*/ }
             | primary_terminal error '\n' {/* give out the eror line for exp */; yyerrok;}
             |  primary_terminal exp error {/* give out the eror line for newline */; yyerrok;}

if i try to give out the errorline for  primary_terminal by adding a new opition: error exp '\n' {/* give out the eror line for primary_terminal */; yyerrok;},
so caused the rule stmnts  conflicts.

how will that be agreed?
xwb (Programmer)
9 Sep 06 9:52
You need to break it down further

CODE

stmnts:   primary_terminal experr '\n'      {/* read something...*/ }

experr: exp |
        error |
        exp error
I'm not sure if that will work - you may need to break that down even further.
homeless (Programmer)
11 Sep 06 9:38
thx xwb,

but this was not the answer of my question. think about an input statement like this one:

CODE

   if(x>y){...}
with the primary_terminal "if" and

CODE

   while(x>y){...}
with the primary_terminal "else"
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