Re: Hi everyone,

Now a very simple question: i have this lexer.l file:

%{
#include <stdio.h>
#include <stdlib.h>

enum yytokentype {
     NUMBER = 285,
     VAL = 292,
     ADD = 286,
     SUB = 287,
     MUL = 288,
     DIV = 289,
     ABS = 290,
     EOL    = 291,
     STRING = 292
};
int yylval;
char yyltext[256];
%}

%%

"+"            { return ADD; }
"-"            { return SUB; }
"*"            { return MUL; }
"/"            { return DIV; }
"|"            { return ABS; }
[a-zA-Z]    { strcpy(yytext, yyltext); return STRING; }
[0-9]+        { yylval = atoi(yytext); return NUMBER; }
\n            { return EOL; }
[ \t]        { /* ignore whitespaces */ }
.            { printf("Unknow char :%c", *yytext); }

%%

int main(int argc, char **argv){
     int tok;

     while(tok = yylex())
     {
         printf("%d", tok);
         if(tok == STRING) {
             printf(" = %s\n", &yyltext);
         }else if(tok == NUMBER) {
             printf(" = %d\n", yylval);
         }else printf("\n");
     }

     return(0);
}

what am i doing wrong so that i'm not able to parse strings with [a-zA-Z] ?




On 17.02.19 15:53, Akim Demaille wrote:
>
>>> Le 17 févr. 2019 à 14:17, [email protected] <[email protected]> a écrit :
>>>
>>> Is there a way i can put my c source code not inside one the the lexer.l or parser.y files ? so i can keep tem separate from the rules ?
> Two opposite answers:
>
> I said:
>
>> Le 17 févr. 2019 à 15:49, Akim Demaille <[email protected]> a écrit :
>>
>> No, sorry.  There are several approaches to parsing, one which is fully declarative and your rules are "pure".  That's not the case of Flex/Bison: you must define rules with actions.  Yet you should keep your action simple and move complex processing into functions.
> Uxio said:
>
>> Le 17 févr. 2019 à 15:46, Uxio Prego <[email protected]> a écrit :
>>
>> Yes of course, by inclusion of headers, in a very much
>> common way. You can then manipulate shorter *.y and
>> *.l docs, but this is not going to fix any Bison usage issue
>> you are having.
> And of course Uxio is right.  You can put the function you depend upon in other compilation units (i.e., other *.c files).  What I meant is: Flex and Bison are useless if you don't *call* code from your actions.

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