#include "structures.h"

struct av_term_list;


struct av_term{
   int type;
   int index;
   char *const_string;
   struct av_term_list *arguments; 
};

struct av_term_list{
   struct av_term *ptr;
   struct av_term_list *next;
};

struct av_clause{
   struct av_term *head;
   struct av_term_list *body;
   int var_counter;
   int clause_type;
};

struct av_clause_list{
   struct av_clause *ptr;
   struct av_clause_list *next;
};

typedef struct av_clause parser_clause;
typedef struct av_clause_list parser_clause_list;
typedef struct av_term parser_term;
typedef struct av_term_list parser_term_list;



char *var_table[100];
char agent[50];
module_ptr convert_structure();


#define DIRECT_CLAUSE    1
#define FORWARD_CLAUSE   2
#define BACKWARD_CLAUSE  3
#define DIRECT_FORWARD_CLAUSE 4