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Libraries
mruby
Commits
421819dc
Commit
421819dc
authored
Dec 25, 2017
by
Yukihiro "Matz" Matsumoto
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Add `Hash#slice` [Ruby 2.5]
parent
df68a334
Changes
2
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2 changed files
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46 additions
and
0 deletions
+46
-0
mrbgems/mruby-hash-ext/src/hash-ext.c
mrbgems/mruby-hash-ext/src/hash-ext.c
+40
-0
mrbgems/mruby-hash-ext/test/hash.rb
mrbgems/mruby-hash-ext/test/hash.rb
+6
-0
No files found.
mrbgems/mruby-hash-ext/src/hash-ext.c
View file @
421819dc
...
...
@@ -72,6 +72,45 @@ hash_compact_bang(mrb_state *mrb, mrb_value hash)
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
)
{
...
...
@@ -80,6 +119,7 @@ mrb_mruby_hash_ext_gem_init(mrb_state *mrb)
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
...
...
mrbgems/mruby-hash-ext/test/hash.rb
View file @
421819dc
...
...
@@ -292,3 +292,9 @@ assert("Hash#transform_values") do
assert_equal
(
h
,
h
.
transform_values!
{
|
v
|
v
.
to_s
})
assert_equal
({
a:
"1"
,
b:
"2"
,
c:
"3"
},
h
)
end
assert
(
"Hash#slice"
)
do
h
=
{
a:
100
,
b:
200
,
c:
300
}
assert_equal
({
:a
=>
100
},
h
.
slice
(
:a
))
assert_equal
({
:b
=>
200
,
:c
=>
300
},
h
.
slice
(
:b
,
:c
,
:d
))
end
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