mbed-mruby

Diff: src/hash.c

Revision:

0:158c61bb030f

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/hash.c	Wed Mar 25 17:36:16 2015 +0000
@@ -0,0 +1,858 @@
+/*
+** hash.c - Hash class
+**
+** See Copyright Notice in mruby.h
+*/
+
+#include "mruby.h"
+#include "mruby/array.h"
+#include "mruby/class.h"
+#include "mruby/hash.h"
+#include "mruby/khash.h"
+#include "mruby/string.h"
+#include "mruby/variable.h"
+
+/* a function to get hash value of a float number */
+mrb_int mrb_float_id(mrb_float f);
+
+static inline khint_t
+mrb_hash_ht_hash_func(mrb_state *mrb, mrb_value key)
+{
+  enum mrb_vtype t = mrb_type(key);
+  mrb_value hv;
+  const char *p;
+  mrb_int i, len;
+  khint_t h;
+
+  switch (t) {
+  case MRB_TT_STRING:
+    p = RSTRING_PTR(key);
+    len = RSTRING_LEN(key);
+    h = 0;
+    for (i=0; i<len; i++) {
+      h = (h << 5) - h + *p++;
+    }
+    return h;
+
+  case MRB_TT_SYMBOL:
+    h = (khint_t)mrb_symbol(key);
+    return kh_int_hash_func(mrb, h);
+
+  case MRB_TT_FIXNUM:
+    h = (khint_t)mrb_float_id((mrb_float)mrb_fixnum(key));
+    return kh_int_hash_func(mrb, h);
+
+  case MRB_TT_FLOAT:
+    h = (khint_t)mrb_float_id(mrb_float(key));
+    return kh_int_hash_func(mrb, h);
+
+  default:
+    hv = mrb_funcall(mrb, key, "hash", 0);
+    h = (khint_t)t ^ mrb_fixnum(hv);
+    return kh_int_hash_func(mrb, h);
+  }
+}
+
+static inline khint_t
+mrb_hash_ht_hash_equal(mrb_state *mrb, mrb_value a, mrb_value b)
+{
+  enum mrb_vtype t = mrb_type(a);
+
+  switch (t) {
+  case MRB_TT_STRING:
+    return mrb_str_equal(mrb, a, b);
+
+  case MRB_TT_SYMBOL:
+    if (mrb_type(b) != MRB_TT_SYMBOL) return FALSE;
+    return mrb_symbol(a) == mrb_symbol(b);
+
+  case MRB_TT_FIXNUM:
+    switch (mrb_type(b)) {
+    case MRB_TT_FIXNUM:
+      return mrb_fixnum(a) == mrb_fixnum(b);
+    case MRB_TT_FLOAT:
+      return (mrb_float)mrb_fixnum(a) == mrb_float(b);
+    default:
+      return FALSE;
+    }
+
+  case MRB_TT_FLOAT:
+    switch (mrb_type(b)) {
+    case MRB_TT_FIXNUM:
+      return mrb_float(a) == (mrb_float)mrb_fixnum(b);
+    case MRB_TT_FLOAT:
+      return mrb_float(a) == mrb_float(b);
+    default:
+      return FALSE;
+    }
+
+  default:
+    return mrb_eql(mrb, a, b);
+  }
+}
+
+typedef struct {
+  mrb_value v;
+  mrb_int n;
+} mrb_hash_value;
+
+KHASH_DECLARE(ht, mrb_value, mrb_hash_value, TRUE)
+KHASH_DEFINE (ht, mrb_value, mrb_hash_value, TRUE, mrb_hash_ht_hash_func, mrb_hash_ht_hash_equal)
+
+static void mrb_hash_modify(mrb_state *mrb, mrb_value hash);
+
+static inline mrb_value
+mrb_hash_ht_key(mrb_state *mrb, mrb_value key)
+{
+  if (mrb_string_p(key))
+    return mrb_str_dup(mrb, key);
+  else
+    return key;
+}
+
+#define KEY(key) mrb_hash_ht_key(mrb, key)
+
+void
+mrb_gc_mark_hash(mrb_state *mrb, struct RHash *hash)
+{
+  khiter_t k;
+  khash_t(ht) *h = hash->ht;
+
+  if (!h) return;
+  for (k = kh_begin(h); k != kh_end(h); k++) {
+    if (kh_exist(h, k)) {
+      mrb_value key = kh_key(h, k);
+      mrb_value val = kh_value(h, k).v;
+
+      mrb_gc_mark_value(mrb, key);
+      mrb_gc_mark_value(mrb, val);
+    }
+  }
+}
+
+size_t
+mrb_gc_mark_hash_size(mrb_state *mrb, struct RHash *hash)
+{
+  if (!hash->ht) return 0;
+  return kh_size(hash->ht)*2;
+}
+
+void
+mrb_gc_free_hash(mrb_state *mrb, struct RHash *hash)
+{
+  if (hash->ht) kh_destroy(ht, mrb, hash->ht);
+}
+
+
+MRB_API mrb_value
+mrb_hash_new_capa(mrb_state *mrb, int capa)
+{
+  struct RHash *h;
+
+  h = (struct RHash*)mrb_obj_alloc(mrb, MRB_TT_HASH, mrb->hash_class);
+  h->ht = kh_init(ht, mrb);
+  if (capa > 0) {
+    kh_resize(ht, mrb, h->ht, capa);
+  }
+  h->iv = 0;
+  return mrb_obj_value(h);
+}
+
+MRB_API mrb_value
+mrb_hash_new(mrb_state *mrb)
+{
+  return mrb_hash_new_capa(mrb, 0);
+}
+
+MRB_API mrb_value
+mrb_hash_get(mrb_state *mrb, mrb_value hash, mrb_value key)
+{
+  khash_t(ht) *h = RHASH_TBL(hash);
+  khiter_t k;
+
+  if (h) {
+    k = kh_get(ht, mrb, h, key);
+    if (k != kh_end(h))
+      return kh_value(h, k).v;
+  }
+
+  /* not found */
+  if (MRB_RHASH_PROCDEFAULT_P(hash)) {
+    return mrb_funcall(mrb, RHASH_PROCDEFAULT(hash), "call", 2, hash, key);
+  }
+  return RHASH_IFNONE(hash);
+}
+
+MRB_API mrb_value
+mrb_hash_fetch(mrb_state *mrb, mrb_value hash, mrb_value key, mrb_value def)
+{
+  khash_t(ht) *h = RHASH_TBL(hash);
+  khiter_t k;
+
+  if (h) {
+    k = kh_get(ht, mrb, h, key);
+    if (k != kh_end(h))
+      return kh_value(h, k).v;
+  }
+
+  /* not found */
+  return def;
+}
+
+MRB_API void
+mrb_hash_set(mrb_state *mrb, mrb_value hash, mrb_value key, mrb_value val)
+{
+  khash_t(ht) *h;
+  khiter_t k;
+  int r;
+
+  mrb_hash_modify(mrb, hash);
+  h = RHASH_TBL(hash);
+
+  if (!h) h = RHASH_TBL(hash) = kh_init(ht, mrb);
+  k = kh_put2(ht, mrb, h, key, &r);
+  kh_value(h, k).v = val;
+
+  if (r != 0) {
+    /* expand */
+    int ai = mrb_gc_arena_save(mrb);
+    key = kh_key(h, k) = KEY(key);
+    mrb_gc_arena_restore(mrb, ai);
+    kh_value(h, k).n = kh_size(h)-1;
+  }
+
+  mrb_field_write_barrier_value(mrb, (struct RBasic*)RHASH(hash), key);
+  mrb_field_write_barrier_value(mrb, (struct RBasic*)RHASH(hash), val);
+  return;
+}
+
+static mrb_value
+mrb_hash_dup(mrb_state *mrb, mrb_value hash)
+{
+  struct RHash* ret;
+  khash_t(ht) *h, *ret_h;
+  khiter_t k, ret_k;
+
+  h = RHASH_TBL(hash);
+  ret = (struct RHash*)mrb_obj_alloc(mrb, MRB_TT_HASH, mrb->hash_class);
+  ret->ht = kh_init(ht, mrb);
+
+  if (kh_size(h) > 0) {
+    ret_h = ret->ht;
+
+    for (k = kh_begin(h); k != kh_end(h); k++) {
+      if (kh_exist(h, k)) {
+        int ai = mrb_gc_arena_save(mrb);
+        ret_k = kh_put(ht, mrb, ret_h, KEY(kh_key(h, k)));
+        mrb_gc_arena_restore(mrb, ai);
+        kh_val(ret_h, ret_k) = kh_val(h, k);
+      }
+    }
+  }
+
+  return mrb_obj_value(ret);
+}
+
+MRB_API mrb_value
+mrb_check_hash_type(mrb_state *mrb, mrb_value hash)
+{
+  return mrb_check_convert_type(mrb, hash, MRB_TT_HASH, "Hash", "to_hash");
+}
+
+MRB_API khash_t(ht)*
+mrb_hash_tbl(mrb_state *mrb, mrb_value hash)
+{
+  khash_t(ht) *h = RHASH_TBL(hash);
+
+  if (!h) {
+    return RHASH_TBL(hash) = kh_init(ht, mrb);
+  }
+  return h;
+}
+
+static void
+mrb_hash_modify(mrb_state *mrb, mrb_value hash)
+{
+  mrb_hash_tbl(mrb, hash);
+}
+
+/* 15.2.13.4.16 */
+/*
+ *  call-seq:
+ *     Hash.new                          -> new_hash
+ *     Hash.new(obj)                     -> new_hash
+ *     Hash.new {|hash, key| block }     -> new_hash
+ *
+ *  Returns a new, empty hash. If this hash is subsequently accessed by
+ *  a key that doesn't correspond to a hash entry, the value returned
+ *  depends on the style of <code>new</code> used to create the hash. In
+ *  the first form, the access returns <code>nil</code>. If
+ *  <i>obj</i> is specified, this single object will be used for
+ *  all <em>default values</em>. If a block is specified, it will be
+ *  called with the hash object and the key, and should return the
+ *  default value. It is the block's responsibility to store the value
+ *  in the hash if required.
+ *
+ *     h = Hash.new("Go Fish")
+ *     h["a"] = 100
+ *     h["b"] = 200
+ *     h["a"]           #=> 100
+ *     h["c"]           #=> "Go Fish"
+ *     # The following alters the single default object
+ *     h["c"].upcase!   #=> "GO FISH"
+ *     h["d"]           #=> "GO FISH"
+ *     h.keys           #=> ["a", "b"]
+ *
+ *     # While this creates a new default object each time
+ *     h = Hash.new { |hash, key| hash[key] = "Go Fish: #{key}" }
+ *     h["c"]           #=> "Go Fish: c"
+ *     h["c"].upcase!   #=> "GO FISH: C"
+ *     h["d"]           #=> "Go Fish: d"
+ *     h.keys           #=> ["c", "d"]
+ *
+ */
+
+static mrb_value
+mrb_hash_init(mrb_state *mrb, mrb_value hash)
+{
+  mrb_value block, ifnone;
+  mrb_bool ifnone_p;
+
+  ifnone = mrb_nil_value();
+  mrb_get_args(mrb, "&|o?", &block, &ifnone, &ifnone_p);
+  mrb_hash_modify(mrb, hash);
+  if (!mrb_nil_p(block)) {
+    if (ifnone_p) {
+      mrb_raise(mrb, E_ARGUMENT_ERROR, "wrong number of arguments");
+    }
+    RHASH(hash)->flags |= MRB_HASH_PROC_DEFAULT;
+    ifnone = block;
+  }
+  mrb_iv_set(mrb, hash, mrb_intern_lit(mrb, "ifnone"), ifnone);
+  return hash;
+}
+
+/* 15.2.13.4.2  */
+/*
+ *  call-seq:
+ *     hsh[key]    ->  value
+ *
+ *  Element Reference---Retrieves the <i>value</i> object corresponding
+ *  to the <i>key</i> object. If not found, returns the default value (see
+ *  <code>Hash::new</code> for details).
+ *
+ *     h = { "a" => 100, "b" => 200 }
+ *     h["a"]   #=> 100
+ *     h["c"]   #=> nil
+ *
+ */
+static mrb_value
+mrb_hash_aget(mrb_state *mrb, mrb_value self)
+{
+  mrb_value key;
+
+  mrb_get_args(mrb, "o", &key);
+  return mrb_hash_get(mrb, self, key);
+}
+
+/* 15.2.13.4.5  */
+/*
+ *  call-seq:
+ *     hsh.default(key=nil)   -> obj
+ *
+ *  Returns the default value, the value that would be returned by
+ *  <i>hsh</i>[<i>key</i>] if <i>key</i> did not exist in <i>hsh</i>.
+ *  See also <code>Hash::new</code> and <code>Hash#default=</code>.
+ *
+ *     h = Hash.new                            #=> {}
+ *     h.default                               #=> nil
+ *     h.default(2)                            #=> nil
+ *
+ *     h = Hash.new("cat")                     #=> {}
+ *     h.default                               #=> "cat"
+ *     h.default(2)                            #=> "cat"
+ *
+ *     h = Hash.new {|h,k| h[k] = k.to_i*10}   #=> {}
+ *     h.default                               #=> nil
+ *     h.default(2)                            #=> 20
+ */
+
+static mrb_value
+mrb_hash_default(mrb_state *mrb, mrb_value hash)
+{
+  mrb_value key;
+  mrb_bool given;
+
+  mrb_get_args(mrb, "|o?", &key, &given);
+  if (MRB_RHASH_PROCDEFAULT_P(hash)) {
+    if (!given) return mrb_nil_value();
+    return mrb_funcall(mrb, RHASH_PROCDEFAULT(hash), "call", 2, hash, key);
+  }
+  else {
+    return RHASH_IFNONE(hash);
+  }
+}
+
+/* 15.2.13.4.6  */
+/*
+ *  call-seq:
+ *     hsh.default = obj     -> obj
+ *
+ *  Sets the default value, the value returned for a key that does not
+ *  exist in the hash. It is not possible to set the default to a
+ *  <code>Proc</code> that will be executed on each key lookup.
+ *
+ *     h = { "a" => 100, "b" => 200 }
+ *     h.default = "Go fish"
+ *     h["a"]     #=> 100
+ *     h["z"]     #=> "Go fish"
+ *     # This doesn't do what you might hope...
+ *     h.default = proc do |hash, key|
+ *       hash[key] = key + key
+ *     end
+ *     h[2]       #=> #<Proc:0x401b3948@-:6>
+ *     h["cat"]   #=> #<Proc:0x401b3948@-:6>
+ */
+
+static mrb_value
+mrb_hash_set_default(mrb_state *mrb, mrb_value hash)
+{
+  mrb_value ifnone;
+
+  mrb_get_args(mrb, "o", &ifnone);
+  mrb_hash_modify(mrb, hash);
+  mrb_iv_set(mrb, hash, mrb_intern_lit(mrb, "ifnone"), ifnone);
+  RHASH(hash)->flags &= ~(MRB_HASH_PROC_DEFAULT);
+
+  return ifnone;
+}
+
+/* 15.2.13.4.7  */
+/*
+ *  call-seq:
+ *     hsh.default_proc -> anObject
+ *
+ *  If <code>Hash::new</code> was invoked with a block, return that
+ *  block, otherwise return <code>nil</code>.
+ *
+ *     h = Hash.new {|h,k| h[k] = k*k }   #=> {}
+ *     p = h.default_proc                 #=> #<Proc:0x401b3d08@-:1>
+ *     a = []                             #=> []
+ *     p.call(a, 2)
+ *     a                                  #=> [nil, nil, 4]
+ */
+
+
+static mrb_value
+mrb_hash_default_proc(mrb_state *mrb, mrb_value hash)
+{
+  if (MRB_RHASH_PROCDEFAULT_P(hash)) {
+    return RHASH_PROCDEFAULT(hash);
+  }
+  return mrb_nil_value();
+}
+
+/*
+ *  call-seq:
+ *     hsh.default_proc = proc_obj     -> proc_obj
+ *
+ *  Sets the default proc to be executed on each key lookup.
+ *
+ *     h.default_proc = proc do |hash, key|
+ *       hash[key] = key + key
+ *     end
+ *     h[2]       #=> 4
+ *     h["cat"]   #=> "catcat"
+ */
+
+static mrb_value
+mrb_hash_set_default_proc(mrb_state *mrb, mrb_value hash)
+{
+  mrb_value ifnone;
+
+  mrb_get_args(mrb, "o", &ifnone);
+  mrb_hash_modify(mrb, hash);
+  mrb_iv_set(mrb, hash, mrb_intern_lit(mrb, "ifnone"), ifnone);
+  RHASH(hash)->flags |= MRB_HASH_PROC_DEFAULT;
+
+  return ifnone;
+}
+
+MRB_API mrb_value
+mrb_hash_delete_key(mrb_state *mrb, mrb_value hash, mrb_value key)
+{
+  khash_t(ht) *h = RHASH_TBL(hash);
+  khiter_t k;
+  mrb_value delVal;
+  mrb_int n;
+
+  if (h) {
+    k = kh_get(ht, mrb, h, key);
+    if (k != kh_end(h)) {
+      delVal = kh_value(h, k).v;
+      n = kh_value(h, k).n;
+      kh_del(ht, mrb, h, k);
+      for (k = kh_begin(h); k != kh_end(h); k++) {
+        if (!kh_exist(h, k)) continue;
+        if (kh_value(h, k).n > n) kh_value(h, k).n--;
+      }
+      return delVal;
+    }
+  }
+
+  /* not found */
+  return mrb_nil_value();
+}
+
+/* 15.2.13.4.8  */
+/*
+ *  call-seq:
+ *     hsh.delete(key)                   -> value
+ *     hsh.delete(key) {| key | block }  -> value
+ *
+ *  Deletes and returns a key-value pair from <i>hsh</i> whose key is
+ *  equal to <i>key</i>. If the key is not found, returns the
+ *  <em>default value</em>. If the optional code block is given and the
+ *  key is not found, pass in the key and return the result of
+ *  <i>block</i>.
+ *
+ *     h = { "a" => 100, "b" => 200 }
+ *     h.delete("a")                              #=> 100
+ *     h.delete("z")                              #=> nil
+ *     h.delete("z") { |el| "#{el} not found" }   #=> "z not found"
+ *
+ */
+static mrb_value
+mrb_hash_delete(mrb_state *mrb, mrb_value self)
+{
+  mrb_value key;
+
+  mrb_get_args(mrb, "o", &key);
+  return mrb_hash_delete_key(mrb, self, key);
+}
+
+/* 15.2.13.4.24 */
+/*
+ *  call-seq:
+ *     hsh.shift -> anArray or obj
+ *
+ *  Removes a key-value pair from <i>hsh</i> and returns it as the
+ *  two-item array <code>[</code> <i>key, value</i> <code>]</code>, or
+ *  the hash's default value if the hash is empty.
+ *
+ *     h = { 1 => "a", 2 => "b", 3 => "c" }
+ *     h.shift   #=> [1, "a"]
+ *     h         #=> {2=>"b", 3=>"c"}
+ */
+
+static mrb_value
+mrb_hash_shift(mrb_state *mrb, mrb_value hash)
+{
+  khash_t(ht) *h = RHASH_TBL(hash);
+  khiter_t k;
+  mrb_value delKey, delVal;
+
+  mrb_hash_modify(mrb, hash);
+  if (h && kh_size(h) > 0) {
+    for (k = kh_begin(h); k != kh_end(h); k++) {
+      if (!kh_exist(h, k)) continue;
+
+      delKey = kh_key(h, k);
+      mrb_gc_protect(mrb, delKey);
+      delVal = mrb_hash_delete_key(mrb, hash, delKey);
+      mrb_gc_protect(mrb, delVal);
+
+      return mrb_assoc_new(mrb, delKey, delVal);
+    }
+  }
+
+  if (MRB_RHASH_PROCDEFAULT_P(hash)) {
+    return mrb_funcall(mrb, RHASH_PROCDEFAULT(hash), "call", 2, hash, mrb_nil_value());
+  }
+  else {
+    return RHASH_IFNONE(hash);
+  }
+}
+
+/* 15.2.13.4.4  */
+/*
+ *  call-seq:
+ *     hsh.clear -> hsh
+ *
+ *  Removes all key-value pairs from <i>hsh</i>.
+ *
+ *     h = { "a" => 100, "b" => 200 }   #=> {"a"=>100, "b"=>200}
+ *     h.clear                          #=> {}
+ *
+ */
+
+MRB_API mrb_value
+mrb_hash_clear(mrb_state *mrb, mrb_value hash)
+{
+  khash_t(ht) *h = RHASH_TBL(hash);
+
+  if (h) kh_clear(ht, mrb, h);
+  return hash;
+}
+
+/* 15.2.13.4.3  */
+/* 15.2.13.4.26 */
+/*
+ *  call-seq:
+ *     hsh[key] = value        -> value
+ *     hsh.store(key, value)   -> value
+ *
+ *  Element Assignment---Associates the value given by
+ *  <i>value</i> with the key given by <i>key</i>.
+ *  <i>key</i> should not have its value changed while it is in
+ *  use as a key (a <code>String</code> passed as a key will be
+ *  duplicated and frozen).
+ *
+ *     h = { "a" => 100, "b" => 200 }
+ *     h["a"] = 9
+ *     h["c"] = 4
+ *     h   #=> {"a"=>9, "b"=>200, "c"=>4}
+ *
+ */
+static mrb_value
+mrb_hash_aset(mrb_state *mrb, mrb_value self)
+{
+  mrb_value key, val;
+
+  mrb_get_args(mrb, "oo", &key, &val);
+  mrb_hash_set(mrb, self, key, val);
+  return val;
+}
+
+/* 15.2.13.4.20 */
+/* 15.2.13.4.25 */
+/*
+ *  call-seq:
+ *     hsh.length    ->  fixnum
+ *     hsh.size      ->  fixnum
+ *
+ *  Returns the number of key-value pairs in the hash.
+ *
+ *     h = { "d" => 100, "a" => 200, "v" => 300, "e" => 400 }
+ *     h.length        #=> 4
+ *     h.delete("a")   #=> 200
+ *     h.length        #=> 3
+ */
+static mrb_value
+mrb_hash_size_m(mrb_state *mrb, mrb_value self)
+{
+  khash_t(ht) *h = RHASH_TBL(self);
+
+  if (!h) return mrb_fixnum_value(0);
+  return mrb_fixnum_value(kh_size(h));
+}
+
+/* 15.2.13.4.12 */
+/*
+ *  call-seq:
+ *     hsh.empty?    -> true or false
+ *
+ *  Returns <code>true</code> if <i>hsh</i> contains no key-value pairs.
+ *
+ *     {}.empty?   #=> true
+ *
+ */
+MRB_API mrb_value
+mrb_hash_empty_p(mrb_state *mrb, mrb_value self)
+{
+  khash_t(ht) *h = RHASH_TBL(self);
+
+  if (h) return mrb_bool_value(kh_size(h) == 0);
+  return mrb_true_value();
+}
+
+/* 15.2.13.4.29 (x)*/
+/*
+ * call-seq:
+ *    hsh.to_hash   => hsh
+ *
+ * Returns +self+.
+ */
+
+static mrb_value
+mrb_hash_to_hash(mrb_state *mrb, mrb_value hash)
+{
+  return hash;
+}
+
+/* 15.2.13.4.19 */
+/*
+ *  call-seq:
+ *     hsh.keys    -> array
+ *
+ *  Returns a new array populated with the keys from this hash. See also
+ *  <code>Hash#values</code>.
+ *
+ *     h = { "a" => 100, "b" => 200, "c" => 300, "d" => 400 }
+ *     h.keys   #=> ["a", "b", "c", "d"]
+ *
+ */
+
+MRB_API mrb_value
+mrb_hash_keys(mrb_state *mrb, mrb_value hash)
+{
+  khash_t(ht) *h = RHASH_TBL(hash);
+  khiter_t k;
+  mrb_value ary;
+  mrb_value *p;
+
+  if (!h || kh_size(h) == 0) return mrb_ary_new(mrb);
+  ary = mrb_ary_new_capa(mrb, kh_size(h));
+  mrb_ary_set(mrb, ary, kh_size(h)-1, mrb_nil_value());
+  p = mrb_ary_ptr(ary)->ptr;
+  for (k = kh_begin(h); k != kh_end(h); k++) {
+    if (kh_exist(h, k)) {
+      mrb_value kv = kh_key(h, k);
+      mrb_hash_value hv = kh_value(h, k);
+
+      p[hv.n] = kv;
+    }
+  }
+  return ary;
+}
+
+/* 15.2.13.4.28 */
+/*
+ *  call-seq:
+ *     hsh.values    -> array
+ *
+ *  Returns a new array populated with the values from <i>hsh</i>. See
+ *  also <code>Hash#keys</code>.
+ *
+ *     h = { "a" => 100, "b" => 200, "c" => 300 }
+ *     h.values   #=> [100, 200, 300]
+ *
+ */
+
+static mrb_value
+mrb_hash_values(mrb_state *mrb, mrb_value hash)
+{
+  khash_t(ht) *h = RHASH_TBL(hash);
+  khiter_t k;
+  mrb_value ary;
+
+  if (!h) return mrb_ary_new(mrb);
+  ary = mrb_ary_new_capa(mrb, kh_size(h));
+  for (k = kh_begin(h); k != kh_end(h); k++) {
+    if (kh_exist(h, k)) {
+      mrb_hash_value hv = kh_value(h, k);
+
+      mrb_ary_set(mrb, ary, hv.n, hv.v);
+    }
+  }
+  return ary;
+}
+
+/* 15.2.13.4.13 */
+/* 15.2.13.4.15 */
+/* 15.2.13.4.18 */
+/* 15.2.13.4.21 */
+/*
+ *  call-seq:
+ *     hsh.has_key?(key)    -> true or false
+ *     hsh.include?(key)    -> true or false
+ *     hsh.key?(key)        -> true or false
+ *     hsh.member?(key)     -> true or false
+ *
+ *  Returns <code>true</code> if the given key is present in <i>hsh</i>.
+ *
+ *     h = { "a" => 100, "b" => 200 }
+ *     h.has_key?("a")   #=> true
+ *     h.has_key?("z")   #=> false
+ *
+ */
+
+static mrb_value
+mrb_hash_has_key(mrb_state *mrb, mrb_value hash)
+{
+  mrb_value key;
+  khash_t(ht) *h;
+  khiter_t k;
+
+  mrb_get_args(mrb, "o", &key);
+
+  h = RHASH_TBL(hash);
+  if (h) {
+    k = kh_get(ht, mrb, h, key);
+    return mrb_bool_value(k != kh_end(h));
+  }
+  return mrb_false_value();
+}
+
+/* 15.2.13.4.14 */
+/* 15.2.13.4.27 */
+/*
+ *  call-seq:
+ *     hsh.has_value?(value)    -> true or false
+ *     hsh.value?(value)        -> true or false
+ *
+ *  Returns <code>true</code> if the given value is present for some key
+ *  in <i>hsh</i>.
+ *
+ *     h = { "a" => 100, "b" => 200 }
+ *     h.has_value?(100)   #=> true
+ *     h.has_value?(999)   #=> false
+ */
+
+static mrb_value
+mrb_hash_has_value(mrb_state *mrb, mrb_value hash)
+{
+  mrb_value val;
+  khash_t(ht) *h;
+  khiter_t k;
+
+  mrb_get_args(mrb, "o", &val);
+  h = RHASH_TBL(hash);
+
+  if (h) {
+    for (k = kh_begin(h); k != kh_end(h); k++) {
+      if (!kh_exist(h, k)) continue;
+
+      if (mrb_equal(mrb, kh_value(h, k).v, val)) {
+        return mrb_true_value();
+      }
+    }
+  }
+  return mrb_false_value();
+}
+
+void
+mrb_init_hash(mrb_state *mrb)
+{
+  struct RClass *h;
+
+  h = mrb->hash_class = mrb_define_class(mrb, "Hash", mrb->object_class);              /* 15.2.13 */
+  MRB_SET_INSTANCE_TT(h, MRB_TT_HASH);
+
+  mrb_define_method(mrb, h, "[]",              mrb_hash_aget,        MRB_ARGS_REQ(1)); /* 15.2.13.4.2  */
+  mrb_define_method(mrb, h, "[]=",             mrb_hash_aset,        MRB_ARGS_REQ(2)); /* 15.2.13.4.3  */
+  mrb_define_method(mrb, h, "clear",           mrb_hash_clear,       MRB_ARGS_NONE()); /* 15.2.13.4.4  */
+  mrb_define_method(mrb, h, "default",         mrb_hash_default,     MRB_ARGS_ANY());  /* 15.2.13.4.5  */
+  mrb_define_method(mrb, h, "default=",        mrb_hash_set_default, MRB_ARGS_REQ(1)); /* 15.2.13.4.6  */
+  mrb_define_method(mrb, h, "default_proc",    mrb_hash_default_proc,MRB_ARGS_NONE()); /* 15.2.13.4.7  */
+  mrb_define_method(mrb, h, "default_proc=",   mrb_hash_set_default_proc,MRB_ARGS_REQ(1)); /* 15.2.13.4.7  */
+  mrb_define_method(mrb, h, "__delete",        mrb_hash_delete,      MRB_ARGS_REQ(1)); /* core of 15.2.13.4.8  */
+  mrb_define_method(mrb, h, "empty?",          mrb_hash_empty_p,     MRB_ARGS_NONE()); /* 15.2.13.4.12 */
+  mrb_define_method(mrb, h, "has_key?",        mrb_hash_has_key,     MRB_ARGS_REQ(1)); /* 15.2.13.4.13 */
+  mrb_define_method(mrb, h, "has_value?",      mrb_hash_has_value,   MRB_ARGS_REQ(1)); /* 15.2.13.4.14 */
+  mrb_define_method(mrb, h, "include?",        mrb_hash_has_key,     MRB_ARGS_REQ(1)); /* 15.2.13.4.15 */
+  mrb_define_method(mrb, h, "initialize",      mrb_hash_init,        MRB_ARGS_OPT(1)); /* 15.2.13.4.16 */
+  mrb_define_method(mrb, h, "key?",            mrb_hash_has_key,     MRB_ARGS_REQ(1)); /* 15.2.13.4.18 */
+  mrb_define_method(mrb, h, "keys",            mrb_hash_keys,        MRB_ARGS_NONE()); /* 15.2.13.4.19 */
+  mrb_define_method(mrb, h, "length",          mrb_hash_size_m,      MRB_ARGS_NONE()); /* 15.2.13.4.20 */
+  mrb_define_method(mrb, h, "member?",         mrb_hash_has_key,     MRB_ARGS_REQ(1)); /* 15.2.13.4.21 */
+  mrb_define_method(mrb, h, "shift",           mrb_hash_shift,       MRB_ARGS_NONE()); /* 15.2.13.4.24 */
+  mrb_define_method(mrb, h, "dup",             mrb_hash_dup,         MRB_ARGS_NONE());
+  mrb_define_method(mrb, h, "size",            mrb_hash_size_m,      MRB_ARGS_NONE()); /* 15.2.13.4.25 */
+  mrb_define_method(mrb, h, "store",           mrb_hash_aset,        MRB_ARGS_REQ(2)); /* 15.2.13.4.26 */
+  mrb_define_method(mrb, h, "value?",          mrb_hash_has_value,   MRB_ARGS_REQ(1)); /* 15.2.13.4.27 */
+  mrb_define_method(mrb, h, "values",          mrb_hash_values,      MRB_ARGS_NONE()); /* 15.2.13.4.28 */
+
+  mrb_define_method(mrb, h, "to_hash",         mrb_hash_to_hash,     MRB_ARGS_NONE()); /* 15.2.13.4.29 (x)*/
+}
+