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#include "environment.h"
#include "gc.h"
#include "errors.h"
Environment *
env_create(Environment *parent) {
Environment *env = alloc_env();
env->parent = parent;
env->marked = false;
env->table = ht_init();
return env;
}
void
env_add_symbol(Environment *env, Object *symbol, Object *value) {
if (symbol->type != OBJ_TYPE_SYMBOL) {
error_push((Error){
.type = ERR_TYPE_RUNTIME,
.value = ERR_NOT_A_SYMBOL,
.line = 0,
.col = 0,
});
return;
}
ht_insert(env->table, symbol, value);
}
Object *
env_lookup(Environment *env, Object *symbol) {
while (env != NULL) {
Object *obj = ht_lookup(env->table, symbol);
if (obj != NULL) {
return obj;
}
env = env->parent;
}
return obj_err;
}
Object *
env_update(Environment *env, Object *symbol, Object *value) {
while (env != NULL) {
Object *obj = ht_lookup(env->table, symbol);
if (obj != NULL) {
ht_insert(env->table, symbol, value);
return obj_nil;
}
env = env->parent;
}
error_push((Error){
.type = ERR_TYPE_RUNTIME,
.value = ERR_SYMBOL_NOT_FOUND,
});
return obj_err;
}
void
env_add_or_update_current(Environment *env, Object *symbol, Object *value) {
ht_insert(env->table, symbol, value);
}
Environment *
env_extend(Environment *parent, Environment *extra) {
Environment *env = parent;
HashTablePair *pairs = extra->table->pairs;
for (size_t i = 0; i < array_cap(pairs); i++) {
if (pairs[i].key != NULL) {
ht_insert(env->table, pairs[i].key, pairs[i].value);
}
}
return env;
}
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