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/*
** hash.c - Hash class
**
** See Copyright Notice in mruby.h
*/
#include <mruby.h>
#include <mruby/array.h>
#include <mruby/hash.h>
/*
* call-seq:
* hsh.values_at(key, ...) -> array
*
* Return an array containing the values associated with the given keys.
* Also see <code>Hash.select</code>.
*
* h = { "cat" => "feline", "dog" => "canine", "cow" => "bovine" }
* h.values_at("cow", "cat") #=> ["bovine", "feline"]
*/
static mrb_value
hash_values_at(mrb_state *mrb, mrb_value hash)
{
mrb_value *argv, result;
mrb_int argc, i;
int ai;
mrb_get_args(mrb, "*", &argv, &argc);
result = mrb_ary_new_capa(mrb, argc);
ai = mrb_gc_arena_save(mrb);
for (i = 0; i < argc; i++) {
mrb_ary_push(mrb, result, mrb_hash_get(mrb, hash, argv[i]));
mrb_gc_arena_restore(mrb, ai);
}
return result;
}
/*
* call-seq:
* hsh.compact! -> hsh
*
* Removes all nil values from the hash. Returns the hash.
*
* h = { a: 1, b: false, c: nil }
* h.compact! #=> { a: 1, b: false }
*/
static mrb_value
hash_compact_bang(mrb_state *mrb, mrb_value hash)
{
khiter_t k;
khash_t(ht) *h = RHASH_TBL(hash);
mrb_int n = -1;
if (!h) return mrb_nil_value();
for (k = kh_begin(h); k != kh_end(h); k++) {
if (kh_exist(h, k)) {
mrb_value val = kh_value(h, k).v;
khiter_t k2;
if (mrb_nil_p(val)) {
kh_del(ht, mrb, h, k);
n = kh_value(h, k).n;
for (k2 = kh_begin(h); k2 != kh_end(h); k2++) {
if (!kh_exist(h, k2)) continue;
if (kh_value(h, k2).n > n) kh_value(h, k2).n--;
}
}
}
}
if (n < 0) return mrb_nil_value();
return hash;
}
/*
* call-seq:
* hsh.slice(*keys) -> a_hash
*
* Returns a hash containing only the given keys and their values.
*
* h = { a: 100, b: 200, c: 300 }
* h.slice(:a) #=> {:a=>100}
* h.slice(:b, :c, :d) #=> {:b=>200, :c=>300}
*/
static mrb_value
hash_slice(mrb_state *mrb, mrb_value hash)
{
khash_t(ht) *h = RHASH_TBL(hash);
mrb_value *argv, result;
mrb_int argc, i;
khiter_t k;
int ai;
mrb_get_args(mrb, "*", &argv, &argc);
if (argc == 0 || h == NULL) {
return mrb_hash_new_capa(mrb, argc);
}
result = mrb_hash_new_capa(mrb, argc);
ai = mrb_gc_arena_save(mrb);
for (i = 0; i < argc; i++) {
mrb_value key = argv[i];
k = kh_get(ht, mrb, h, key);
if (k != kh_end(h)) {
mrb_value val = kh_value(h, k).v;
mrb_hash_set(mrb, result, key, val);
}
mrb_gc_arena_restore(mrb, ai);
}
return result;
}
void
mrb_mruby_hash_ext_gem_init(mrb_state *mrb)
{
struct RClass *h;
h = mrb->hash_class;
mrb_define_method(mrb, h, "values_at", hash_values_at, MRB_ARGS_ANY());
mrb_define_method(mrb, h, "compact!", hash_compact_bang, MRB_ARGS_NONE());
mrb_define_method(mrb, h, "slice", hash_slice, MRB_ARGS_ANY());
}
void
mrb_mruby_hash_ext_gem_final(mrb_state *mrb)
{
}
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