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#ifndef LISP_H
#define LISP_H
typedef enum {
VALTYPE_INT,
VALTYPE_DOUBLE,
VALTYPE_SYMBOL,
VALTYPE_STRING,
VALTYPE_NIL,
VALTYPE_PAIR
} val_type;
typedef struct value value;
struct value {
val_type type;
union {
int i;
double d;
const char *sym;
const char *str;
struct {
value *car;
value *cdr;
} pair;
} as;
};
value *make_int(int i);
value *make_double(double d);
value *make_symbol(const char *sym);
value *make_string(const char *str);
value *make_nil();
value *cons(value *car, value *cdr);
void *print_value(value *val);
// environments, TODO: make this use hashtable
// symbol->val
typedef struct env env;
typedef struct env {
const char *symbol;
value *value;
env *next;
env *parent;
} env;
env *env_create(env *parent);
env *env_define(env *e, const char *sym, value *val);
value *env_lookup(env *e, const char *sym);
#endif
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