CS456 - Systems Programming Spring 2025

Displaying ./code/lexyacc/example7.l

/*

Compile with :
> lex example7.l
> yacc -d example7.y
> gcc lex.yy.c y.tab.c -o example7

*/

%{
#include <stdio.h>
#include <string.h>
#include "y.tab.h"
%}
%%
[0-9]+                  yylval.number=atoi(yytext); return NUMBER;
heater			return TOKHEATER;
heat                    return TOKHEAT;
on|off                  yylval.number=!strcmp(yytext,"on"); return STATE;
target                  return TOKTARGET;
temperature             return TOKTEMPERATURE;
[a-z0-9]+		yylval.string=strdup(yytext);return WORD;
\n                      /* ignore end of line */;
[ \t]+                  /* ignore whitespace */;
%%