Add Kernel.Array

mrbgems/mruby-kernel-ext/src/kernel.c

 #include "mruby.h"
 #include "mruby/error.h"
+#include "mruby/object.h"
+#include "mruby/array.h"
 
 /*
  *  call-seq:
@@ -21,6 +23,40 @@ mrb_f_method(mrb_state *mrb, mrb_value self)
     return mrb_nil_value();
 }
 
+/*
+ *  call-seq:
+ *     Array(arg)    -> array
+ *
+ *  Returns +arg+ as an Array.
+ *
+ *  First tries to call Array#to_ary on +arg+, then Array#to_a.
+ *
+ *     Array(1..5)   #=> [1, 2, 3, 4, 5]
+ *
+ */
+static mrb_value
+mrb_f_array(mrb_state *mrb, mrb_value self)
+{
+  mrb_value argv, tmp;
+
+  mrb_get_args(mrb, "o", &argv);
+  tmp = mrb_check_array_type(mrb, argv);
+
+  if (mrb_nil_p(tmp)) {
+    tmp = mrb_check_convert_type(mrb, argv, MRB_TT_ARRAY, "Array", "to_a");
+  }
+  if (mrb_nil_p(tmp)) {
+    struct RArray *a;
+
+    tmp = mrb_ary_new_capa(mrb, 1);
+    a = mrb_ary_ptr(tmp);
+    a->ptr[0] = argv;
+    a->len = 1;
+  }
+
+  return tmp;
+}
+
 void
 mrb_mruby_kernel_ext_gem_init(mrb_state *mrb)
 {
@@ -28,6 +64,7 @@ mrb_mruby_kernel_ext_gem_init(mrb_state *mrb)
 
   mrb_define_module_function(mrb, krn, "fail", mrb_f_raise, MRB_ARGS_OPT(2));
   mrb_define_method(mrb, krn, "__method__", mrb_f_method, MRB_ARGS_NONE());
+  mrb_define_module_function(mrb, krn, "Array", mrb_f_array, MRB_ARGS_REQ(1));
 }
 
 void

mrbgems/mruby-kernel-ext/test/kernel.rb

@@ -16,3 +16,10 @@ assert('Kernel#__method__') do
   assert_equal(:m1, c.new.m1)
   assert_equal(:m2, c.new.m2)
 end
+
+assert('Kernel#Array') do
+  assert_equal([1], Kernel.Array(1))
+  assert_equal([1, 2, 3, 4, 5], Kernel.Array([1, 2, 3, 4, 5]))
+  assert_equal([1, 2, 3, 4, 5], Kernel.Array(1..5))
+  assert_equal([[:a, 1], [:b, 2], [:c, 3]], Kernel.Array({a:1, b:2, c:3}))
+end