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#ifndef ATOM_H
#define ATOM_H
#define LIST_GET_ATOM(LIST) ((struct atom *) (LIST)->data)
#define ATOM_TYPE(LIST) ((LIST_GET_ATOM(LIST))->type)
#define IS_INT(LIST) ((ATOM_TYPE(LIST)) == ATOM_INT)
#define IS_STR(LIST) ((ATOM_TYPE(LIST)) == ATOM_STR)
#define IS_SYM(LIST) ((ATOM_TYPE(LIST)) == ATOM_SYMBOL)
#define IS_LIST(LIST) ((ATOM_TYPE(LIST)) == ATOM_LIST)
#define IS_TRUE(LIST) (LIST_GET_ATOM(LIST) == &true_atom)
#define IS_FALSE(LIST) (LIST_GET_ATOM(LIST) == &false_atom)
#define IS_NIL(LIST) (LIST_GET_ATOM(LIST) == &nil_atom)
#define CAR(LIST) LIST
#define CDR(LIST) ((LIST) != NULL ? (LIST)->next : NULL)
#define CDDR(LIST) CDR(CDR(LIST))
enum
{
ATOM_NIL,
ATOM_INT,
ATOM_STR,
ATOM_SYMBOL,
ATOM_LIST
};
struct atom
{
union
{
long l;
struct
{
char *str;
int len;
} str;
struct list *list;
};
char type;
};
struct list;
struct atom *atom_new(char type);
struct atom *atom_new_int(long l);
struct atom *atom_new_str(const char *str, int len);
struct atom *atom_new_sym(const char *sym, int len);
struct atom *atom_new_list(struct list *list);
extern struct atom true_atom;
extern struct atom false_atom;
extern struct atom nil_atom;
#endif
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