mrkn	2018-09-28 11:18:58 +0900 (Fri, 28 Sep 2018)

  New Revision: 64869

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=64869

  Log:
    range.c: Add Range#%
    
    [Feature #14697] [ruby-core:86588]

  Modified files:
    trunk/NEWS
    trunk/range.c
    trunk/test/ruby/test_range.rb
Index: range.c
===================================================================
--- range.c	(revision 64868)
+++ range.c	(revision 64869)
@@ -497,6 +497,12 @@ range_step(int argc, VALUE *argv, VALUE https://github.com/ruby/ruby/blob/trunk/range.c#L497
     return range;
 }
 
+static VALUE
+range_percent_step(VALUE range, VALUE step)
+{
+  return range_step(1, &step, range);
+}
+
 #if SIZEOF_DOUBLE == 8 && defined(HAVE_INT64_T)
 union int64_double {
     int64_t i;
@@ -1549,6 +1555,7 @@ Init_Range(void) https://github.com/ruby/ruby/blob/trunk/range.c#L1555
     rb_define_method(rb_cRange, "hash", range_hash, 0);
     rb_define_method(rb_cRange, "each", range_each, 0);
     rb_define_method(rb_cRange, "step", range_step, -1);
+    rb_define_method(rb_cRange, "%", range_percent_step, 1);
     rb_define_method(rb_cRange, "bsearch", range_bsearch, 0);
     rb_define_method(rb_cRange, "begin", range_begin, 0);
     rb_define_method(rb_cRange, "end", range_end, 0);
Index: NEWS
===================================================================
--- NEWS	(revision 64868)
+++ NEWS	(revision 64869)
@@ -217,6 +217,10 @@ sufficient information, see the ChangeLo https://github.com/ruby/ruby/blob/trunk/NEWS#L217
 
 * `Range`
 
+    * New methods:
+
+        * Added `Range#%` instance method.  [Feature #14697]
+
     * Incompatible changes:
 
         * `Range#===` now uses `#cover?` instead of `#include?` method.
Index: test/ruby/test_range.rb
===================================================================
--- test/ruby/test_range.rb	(revision 64868)
+++ test/ruby/test_range.rb	(revision 64869)
@@ -322,6 +322,15 @@ class TestRange < Test::Unit::TestCase https://github.com/ruby/ruby/blob/trunk/test/ruby/test_range.rb#L322
     assert_equal(["a", "b", "c"], a)
   end
 
+  def test_percent_step
+    aseq = (1..10) % 2
+    assert_equal(Enumerator::ArithmeticSequence, aseq.class)
+    assert_equal(1, aseq.begin)
+    assert_equal(10, aseq.end)
+    assert_equal(2, aseq.step)
+    assert_equal([1, 3, 5, 7, 9], aseq.to_a)
+  end
+
   def test_step_ruby_core_35753
     assert_equal(6, (1...6.3).step.to_a.size)
     assert_equal(5, (1.1...6).step.to_a.size)

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