149 lines
3.0 KiB
C
149 lines
3.0 KiB
C
/**
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* See Copyright Notice in picrin.h
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*/
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#include "picrin.h"
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KHASH_DEFINE(weak, void *, pic_value, kh_ptr_hash_func, kh_ptr_hash_equal)
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struct pic_weak *
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pic_make_weak(pic_state *pic)
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{
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struct pic_weak *weak;
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weak = (struct pic_weak *)pic_obj_alloc(pic, sizeof(struct pic_weak), PIC_TT_WEAK);
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weak->prev = NULL;
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kh_init(weak, &weak->hash);
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return weak;
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}
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pic_value
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pic_weak_ref(pic_state *pic, struct pic_weak *weak, void *key)
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{
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khash_t(weak) *h = &weak->hash;
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khiter_t it;
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it = kh_get(weak, h, key);
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if (it == kh_end(h)) {
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pic_errorf(pic, "element not found for a key: ~s", pic_obj_value(key));
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}
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return kh_val(h, it);
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}
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void *
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pic_weak_rev_ref(pic_state *pic, struct pic_weak *weak, pic_value val)
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{
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khash_t(weak) *h = &weak->hash;
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if (h->n_buckets) {
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khint_t i = 0;
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while ((i < h->n_buckets) && (ac_iseither(h->flags, i) || !pic_eq_p(h->vals[i], val))) {
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i += 1;
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}
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if (i < h->n_buckets) return kh_key(h, i);
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}
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pic_errorf(pic, "key not found for an element: ~s", val);
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return NULL;
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}
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void
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pic_weak_set(pic_state PIC_UNUSED(*pic), struct pic_weak *weak, void *key, pic_value val)
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{
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khash_t(weak) *h = &weak->hash;
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int ret;
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khiter_t it;
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it = kh_put(weak, h, key, &ret);
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kh_val(h, it) = val;
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}
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bool
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pic_weak_has(pic_state PIC_UNUSED(*pic), struct pic_weak *weak, void *key)
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{
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return kh_get(weak, &weak->hash, key) != kh_end(&weak->hash);
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}
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void
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pic_weak_del(pic_state *pic, struct pic_weak *weak, void *key)
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{
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khash_t(weak) *h = &weak->hash;
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khiter_t it;
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it = kh_get(weak, h, key);
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if (it == kh_end(h)) {
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pic_errorf(pic, "no slot named ~s found in ephemeron", pic_obj_value(key));
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}
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kh_del(weak, h, it);
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}
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static pic_value
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weak_get(pic_state *pic, struct pic_weak *weak, void *key)
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{
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if (! pic_weak_has(pic, weak, key)) {
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return pic_false_value();
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}
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return pic_cons(pic, pic_obj_value(key), pic_weak_ref(pic, weak, key));
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}
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static pic_value
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weak_set(pic_state *pic, struct pic_weak *weak, void *key, pic_value val)
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{
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if (pic_undef_p(val)) {
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if (pic_weak_has(pic, weak, key)) {
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pic_weak_del(pic, weak, key);
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}
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} else {
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pic_weak_set(pic, weak, key, val);
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}
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return pic_undef_value();
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}
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static pic_value
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weak_call(pic_state *pic)
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{
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struct pic_proc *self;
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struct pic_weak *weak;
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pic_value key, val;
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int n;
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n = pic_get_args(pic, "&o|o", &self, &key, &val);
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if (! pic_obj_p(key)) {
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pic_errorf(pic, "attempted to set a non-object key '~s' in an ephemeron", key);
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}
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weak = pic_weak_ptr(pic_proc_env_ref(pic, self, "weak"));
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if (n == 1) {
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return weak_get(pic, weak, pic_obj_ptr(key));
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} else {
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return weak_set(pic, weak, pic_obj_ptr(key), val);
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}
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}
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static pic_value
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pic_weak_make_ephemeron(pic_state *pic)
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{
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struct pic_weak *weak;
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struct pic_proc *proc;
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pic_get_args(pic, "");
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weak = pic_make_weak(pic);
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proc = pic_make_proc(pic, weak_call);
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pic_proc_env_set(pic, proc, "weak", pic_obj_value(weak));
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return pic_obj_value(proc);
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}
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void
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pic_init_weak(pic_state *pic)
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{
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pic_defun(pic, "make-ephemeron", pic_weak_make_ephemeron);
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}
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