I am trying to make a simple parser that recognizes three keywords and a
newline.
The lexer is as follows
%{
#include <stdio.h>
#include "asm.tab.h"
%}
%%
NOP|SLEEP|RETURN {return TWO;}
%%
The parser
%{
#include <stdio.h>
#include <stdlib.h>
unsigned int PCL=0;
%}
%token TWO NEWLINE
%%
statement: TWO '\n' {PCL++;printf("Identified a line");};
%%
extern FILE *yyin;
int main(int argc, char** argv){
int ret;
if(argc>1){
FILE *file;
file=fopen(argv[1], "r");
yyin = file;
}
do {
ret = yyparse();
printf("Number of Lines %d\t%d\n", PCL, ret);
} while(!feof(yyin));
return 0;
}
int yyerror(char *s) {
fprintf(stderr, "%s\n", s);
return 0;
}
This doesn't work with a simple file like this -
NOP
SLEEP
RETURN
The error it gives is Parse Error. The value for ret is 1 (err).
Help!
Regards
Sukrit
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