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#include <stdlib.h>
#include <string.h>
#include "common.h"
#include "env.h"
#include "list.h"
#include "value.h"
#define HAS(v, flag) (((v) & (flag)) == (flag))
struct env {
struct env *parent;
struct list_head *head;
size_t refs;
size_t circular_refs;
};
struct env_kv {
char *key;
_value_t value;
struct list_head list;
int flags;
};
#include "mempool.h"
MEMPOOL_GENERATE(env, struct env, 256)
MEMPOOL_GENERATE(env_kv, struct env_kv, 1024)
static int equal(char *key1, char *key2)
{
return (strcmp(key1, key2) == 0);
}
static struct env_kv *env_kv_create(char *key, value_t value, int flags)
{
struct env_kv *pair = env_kv_mempool_allocate();
pair->key = key;
pair->value = value;
LIST_EMPTY(&pair->list);
pair->flags = flags;
return pair;
}
static void env_kv_destroy(struct env_kv *pair)
{
if(HAS(pair->flags, ENV_KV_FREE_KEY))
free(pair->key);
value_destroy(pair->value);
env_kv_mempool_free(pair);
}
env_t env_create(env_t parent)
{
env_t env = env_mempool_allocate();
env->parent = env_copy(parent);
env->head = NULL;
env->refs = 0;
env->circular_refs = 0;
return env;
}
void env_destroy(env_t env)
{
if(env == ENV_EMPTY) return;
if(env->refs > env->circular_refs) {
env->refs--;
return;
}
list_for_each_safe(head, env->head) {
struct env_kv *p = list_entry(head, struct env_kv, list);
if(HAS(p->flags, ENV_KV_CIRCULAR_REF)) env->circular_refs--;
env_kv_destroy(p);
}
env_destroy(env->parent);
env_mempool_free(env);
}
int env_insert(env_t env, char *key, _value_t value,
_value_t *prevval, int flags)
{
if(env->head)
list_for_each_entry(struct env_kv, p, list, env->head) {
if(!equal(p->key, key)) continue;
env->circular_refs +=
(HAS(flags, ENV_KV_CIRCULAR_REF) -
HAS(p->flags, ENV_KV_CIRCULAR_REF));
p->flags = flags;
if(prevval) *prevval = p->value;
p->value = value;
return 0;
}
if(HAS(flags, ENV_KV_CIRCULAR_REF)) env->circular_refs++;
struct env_kv *pair = env_kv_create(key, value, flags);
if(env->head) list_append(&pair->list, env->head);
env->head = &pair->list;
return 0;
}
int env_query(env_t env, char *key, _value_t *data)
{
struct env_kv *pair = NULL;
for(env_t e = env; e; e = e->parent) {
if(e->head == NULL) continue;
list_for_each_entry(struct env_kv, p, list, e->head) {
if(equal(p->key, key)) pair = p;
}
if(pair) break;
}
if(!pair) return 1;
*data = pair->value;
return 0;
}
env_t env_copy(env_t env)
{
if(!env) return env;
env->refs++;
return env;
}
// void env_print(env_t env)
// {
// printf("REFS: %d\n", env->refs);
// printf("CREFS: %d\n", env->circular_refs);
// if(!env || !env->head) return;
// list_for_each_entry(struct env_kv, pair, list, env->head) {
// printf("ENTRY: %s %s\n", pair->key, pair->value);
// }
// if(env->parent) {
// printf("---- PARENT ----\n");
// env_print(env->parent);
// printf("-- END PARENT --\n");
// }
// }
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