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#ifndef ENV_H
#define ENV_H
#include "list.h"
// #include "value.h"
typedef struct value * _value_t;
typedef struct env * env_t;
#define ENV_EMPTY NULL
enum env_kv_flag {
ENV_KV_FREE_KEY = 1,
ENV_KV_CIRCULAR_REF = 2
};
env_t env_create(env_t parent);
void env_destroy(env_t env);
int env_insert(env_t env, char *key, _value_t value,
_value_t *prevval, int flags);
int env_query(env_t env, char *key, _value_t *data);
env_t env_copy(env_t env);
int env_depend(env_t parent, env_t dep);
#ifdef DEBUG
void env_print(env_t env);
#endif
#endif
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