laeuchli
asked on
HI more lex and yacc
Hi, sometimes my lex compiler refuses to let me make a new rule for example something like this abc "abc"
{abc}{return(V1);}
It will say rule abc not know. It's driving me nut, please help.
{abc}{return(V1);}
It will say rule abc not know. It's driving me nut, please help.
ahoffmann
if you have not missed the %% separator, please post the file.
ASKER
The file is a little long to post, and besides that it is on a linux filesystem. I would just like to know what can make lex do that.
jesse
jesse
will be hard to analyze without having the code :(
Anyway, check with lex -v what are the tables sizes used(needeed in you program, probably you need to adjust them (see %p %n %a %e %k %o)
Anyway, check with lex -v what are the tables sizes used(needeed in you program, probably you need to adjust them (see %p %n %a %e %k %o)
ASKER
explain the table sizes please. If that does not help I will try to get to code.
Thanks
Thanks
If you use -v option to lex, it print a statistic about lex's internal table usage and sizes. These table sizes can be preset with the spezial %p etc. keywords. Please read lex's man-page for details, it's to much to explain here.
I'm not shure if this is your problem, just an assumtion, 'cause you do give any errors or code :-(
I'm not shure if this is your problem, just an assumtion, 'cause you do give any errors or code :-(
ASKER
%{
#include <stdio.h>
#include <stdlib.h>
#include "os.h"
int k=0;
%}
bootc "void main()"
equal "="
par ["]
ifj "ifj"
word [A-Za-z0-9]*
num [0-9]*
exit "QUIT"
partb "char"
lb "["
rb "]"
semi [;]
%%
{exit} {exit(0);}
{partb} {return(V1);}
{lb} {return(V2);}
{rb} {return(V3);}
{par} {return(V4);}
{bootc} {return(BOOTC);}
{ifj}{return(V9);}
{equal} {return(V5);}
{semi} {return(V6);}
{num} {return(V7);}
{word} {
strcpy(yylval.hold,yytext)
return(V8);
}
%%
Here is the code. I still can'r get it to compile.
#include <stdio.h>
#include <stdlib.h>
#include "os.h"
int k=0;
%}
bootc "void main()"
equal "="
par ["]
ifj "ifj"
word [A-Za-z0-9]*
num [0-9]*
exit "QUIT"
partb "char"
lb "["
rb "]"
semi [;]
%%
{exit} {exit(0);}
{partb} {return(V1);}
{lb} {return(V2);}
{rb} {return(V3);}
{par} {return(V4);}
{bootc} {return(BOOTC);}
{ifj}{return(V9);}
{equal} {return(V5);}
{semi} {return(V6);}
{num} {return(V7);}
{word} {
strcpy(yylval.hold,yytext)
return(V8);
}
%%
Here is the code. I still can'r get it to compile.
ASKER CERTIFIED SOLUTION
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Guess!! this is something new for me.
Is there any place where I can know more about this??
Is there any place where I can know more about this??
ASKER
ahoffmann what do you want me to do about the think that I am already returning with V4. Why would I do this? Please tell me more. lafanga look at my bio and look at the ? looking in a file.
laeuchli, did you replace you rule with the one i posted?
It's slightly different (blanks ;-)
lafanga, how about: man lex; man yacc
It's slightly different (blanks ;-)
lafanga, how about: man lex; man yacc
ASKER
Yes I did and it worked. I would now like to know why?
read man lex ;-)
(at least one white space must seperate a rule from it's actions)
(at least one white space must seperate a rule from it's actions)
ASKER
OHH, I feel dumb. Thanks a lot for your help.