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HI more lex and yacc

Posted on 1998-12-15
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Last Modified: 2010-04-15
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.
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Question by:laeuchli
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13 Comments
 
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Expert Comment

by:ahoffmann
ID: 1255169
if you have not missed the  %%  separator, please post the file.
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Author Comment

by:laeuchli
ID: 1255170
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

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Expert Comment

by:ahoffmann
ID: 1255171
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)

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by:laeuchli
ID: 1255172
explain the table sizes please. If that does not help I will try to get to code.
Thanks

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Expert Comment

by:ahoffmann
ID: 1255173
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 :-(
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Author Comment

by:laeuchli
ID: 1255174
%{
#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.



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Accepted Solution

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ahoffmann earned 400 total points
ID: 1255175
{ifj}      {return(V4);}
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Expert Comment

by:lafanga
ID: 1255176
Guess!! this is something new for me.  
Is there any place where I can know more about this??

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Author Comment

by:laeuchli
ID: 1255177
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.



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Expert Comment

by:ahoffmann
ID: 1255178
laeuchli, did you replace you rule with the one i posted?
It's slightly different (blanks ;-)

lafanga, how about:  man lex; man yacc
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Author Comment

by:laeuchli
ID: 1255179
Yes I did and it worked. I would now like to know why?

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Expert Comment

by:ahoffmann
ID: 1255180
read  man lex  ;-)
(at least one white space must seperate a rule from it's actions)
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Author Comment

by:laeuchli
ID: 1255181
OHH, I feel dumb. Thanks a lot for your help.

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