Implement Struct#values_at and Array#values_at .

Add API `mrb_get_values_at()` to mruby/range.h .

2 files changed, 23 insertions, 0 deletions

diff --git a/mrbgems/mruby-array-ext/src/array.c b/mrbgems/mruby-array-ext/src/array.c
index ad6cead2c..12d0ec743 100644
--- a/mrbgems/mruby-array-ext/src/array.c
+++ b/mrbgems/mruby-array-ext/src/array.c
@@ -1,6 +1,7 @@
 #include "mruby.h"
 #include "mruby/value.h"
 #include "mruby/array.h"
+#include "mruby/range.h"
 
 /*
  *  call-seq:
@@ -122,6 +123,17 @@ mrb_ary_at(mrb_state *mrb, mrb_value ary)
   return mrb_ary_entry(ary, pos);
 }
 
+static mrb_value
+mrb_ary_values_at(mrb_state *mrb, mrb_value self)
+{
+  mrb_int argc;
+  mrb_value *argv;
+
+  mrb_get_args(mrb, "*", &argv, &argc);
+
+  return mrb_get_values_at(mrb, self, MRB_INT_MAX, argc, argv, mrb_ary_ref);
+}
+
 void
 mrb_mruby_array_ext_gem_init(mrb_state* mrb)
 {
@@ -132,6 +144,7 @@ mrb_mruby_array_ext_gem_init(mrb_state* mrb)
   mrb_define_method(mrb, a, "assoc",  mrb_ary_assoc,  MRB_ARGS_REQ(1));
   mrb_define_method(mrb, a, "at",     mrb_ary_at,     MRB_ARGS_REQ(1));
   mrb_define_method(mrb, a, "rassoc", mrb_ary_rassoc, MRB_ARGS_REQ(1));
+  mrb_define_method(mrb, a, "values_at", mrb_ary_values_at, MRB_ARGS_ANY());
 }
 
 void
diff --git a/mrbgems/mruby-array-ext/test/array.rb b/mrbgems/mruby-array-ext/test/array.rb
index b0ad94b38..1fa7cfc04 100644
--- a/mrbgems/mruby-array-ext/test/array.rb
+++ b/mrbgems/mruby-array-ext/test/array.rb
@@ -280,3 +280,13 @@ assert("Array#select!") do
   assert_equal [4, 5], a.select! { |val| val > 3 }
   assert_equal [4, 5], a
 end
+
+assert('Array#values_at') do
+  a = %w{red green purple white none}
+
+  assert_equal %w{red purple none}, a.values_at(0, 2, 4)
+  assert_equal ['green', 'white', nil, nil], a.values_at(1, 3, 5, 7)
+  assert_equal ['none', 'white', 'white', nil], a.values_at(-1, -2, -2, -7)
+  assert_equal ['none', nil, nil, 'red', 'green', 'purple'], a.values_at(4..6, 0...3)
+  assert_raise(TypeError) { a.values_at 'tt' }
+end