%{
#include "parse.h"
int number(void);		/* see below - converts string to integer */
extern int fileno(FILE *);	/* to avoid gcc warning */
%}

%option always-interactive

D			[0-9]

%%
[ \t\r\n\v\f]		/* skip whitespace */
[*+()]			return yytext[0]; /* operators */
{D}+			return( number());
.			return yytext[0]; /* bad token */

%%

void (*jj_junk)(int,char *) = yyunput; /* avoids gcc warnings */
int (*jj2_junk)(void) = input;

void yyerror( const char *msg) /* called for parser syntax error */
{
  printf( "error: %s\n", msg);
}

int yywrap( void) /* called at EOF */
{
  return 1;
}

int number( void)
{
  /* Assume decimal (base 10)
     In general could also handle octal (0DDD...) and hex (0xDDD...)
     Consider using strtol(), can check for overflow.
  */
  if( sscanf( yytext, "%d", &yylval ) != 1 )
    return 0;
  else
    return INTEGER;
}