%{
#include <stdio.h>
#include <string.h>
#include "ort0.h"

int debug=0;

/* with yacc */
extern YYSTYPE yylval; 
/* with just lex */
/* YYSTYPE yylval; */ 

/* if using canned fixed test string */
char INPUT_LINE[] = "usc.playground <- usc.employee.friend";
char *yyfptr = INPUT_LINE; /* default */

#undef YY_INPUT
#define YY_INPUT(buf,result,max_size) \
    { \
    if(yyfptr != NULL) { \
      char* c = strncpy(buf,yyfptr,max_size); \
      if (max_size > 0) buf[max_size-1] = '\0'; \
      if(strlen(yyfptr) > max_size) yyfptr = yyfptr + max_size-1;  \
        else yyfptr=NULL; \
      result = (c == NULL ) ? YY_NULL : strlen(buf); \
      } else { \
         buf[0] = '\0'; \
         result = YY_NULL; \
    } \
    }

void abac_reset_yyfptr(char *str) {
    yyfptr=str;
}

char* abac_get_yyfptr() {
    return yyfptr;
}

/* if using external file input, output */
void abac_reset_yyin(FILE *new_yyin) {
    yyin=new_yyin;
}
void abac_reset_yyout(FILE *new_yyout) {
    yyout=new_yyout;
}
FILE *abac_get_yyin() {
    if(yyin) return yyin;
    else return stdin;
}
FILE *abac_get_yyout() {
    if(yyout) return yyout;
    else return stdout;
}

%}
%%
[a-zA-Z0-9][_a-zA-Z0-9]*    { yylval.string=strdup(yytext); 
                          if(debug) fprintf(yyout,"IDEN ");
                          return IDEN; }
\<-                     { if(debug) fprintf(yyout,"DERIVE ");
                          return DERIVE; }
\.                      { if(debug) fprintf(yyout, "DOT " );
                          return DOT; }
&                       { if(debug) fprintf(yyout, "AND " );
                          return AND; }
\n                      { /* ignore end-of-line */; }
[ \t]+                  { /* ignore whitespace */; }
%%