/*
File: woof6.l
This version handles special characters @#%$^& differently.
These characters are returned by yylex() as their ASCII codes.
Other return values are modified to be larger than 255.
*/

%option noyywrap

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

typedef char* YYSTYPE ;

YYSTYPE yylval ;

#define END 0
#define HEARD 258
#define NEWLINE 259
#define IGNORED 260

%}

%%

<<EOF>> { 
   sprintf(yylval, "\nWoof! are we done talking?\n"); 
   return END; 
}

treat { 
   sprintf(yylval, "\n!!!%s!!! Woof! yummy!\n", yytext); 
   return HEARD;
}

walk { 
   sprintf(yylval, "\n!!!%s!!! Woof! where's the leash?\n", yytext); 
   return HEARD; 
}

dinner { 
   sprintf(yylval, "\n!!!%s!!! Woof! I'm hungry!\n", yytext); 
   return HEARD; 
}

good\ dog { 
   sprintf(yylval, "\n!!!%s!!! Woof! talking about me!\n", yytext); 
   return HEARD;
}

[@#%$^&] {
   return yytext[0] ;

}

\n { 
   yylval[0] = '\0' ;
   return NEWLINE; 
}

. { 
   yylval[0] = '\0' ;
   return IGNORED; 
}

%%

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

   yylval = (char *) malloc(10000) ;
  
   while ( r = yylex() ) {

      // print special characters as themselves
      if (r < 256) {   
         printf("%c", r) ;
         continue ;
      }

      switch (r) {

      case HEARD :
         printf("%s", yylval) ;
         printf("== pat, pat, nice doggy == \n") ;
         break ;

      case NEWLINE :
         printf("\n") ;
         break ;

      case IGNORED :
         printf(".") ;
         break ;

      default :
         fprintf(stderr, "Oops! that wasn't supposed to happen!\n") ;

      }  // end of switch

   }  // end of while
  

   printf("%s", yylval) ;
   free(yylval) ;
   return 0 ;
}