From 85f192b075943b974ce87fcc63d612c0bd9bb337 Mon Sep 17 00:00:00 2001
From: mrkn <mrkn@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Fri, 28 Sep 2018 02:18:58 +0000
Subject: [PATCH] range.c: Add Range#%

[Feature #14697] [ruby-core:86588]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@64869 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 NEWS                    | 4 ++++
 range.c                 | 7 +++++++
 test/ruby/test_range.rb | 9 +++++++++
 3 files changed, 20 insertions(+)

diff --git a/NEWS b/NEWS
index b5fc76c7d7..7824dfc5d7 100644
--- a/NEWS
+++ b/NEWS
@@ -217,6 +217,10 @@ sufficient information, see the ChangeLog file or Redmine
 
 * `Range`
 
+    * New methods:
+
+        * Added `Range#%` instance method.  [Feature #14697]
+
     * Incompatible changes:
 
         * `Range#===` now uses `#cover?` instead of `#include?` method.
diff --git a/range.c b/range.c
index d781af3f2e..297303ba9a 100644
--- a/range.c
+++ b/range.c
@@ -497,6 +497,12 @@ range_step(int argc, VALUE *argv, VALUE range)
     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)
     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);
diff --git a/test/ruby/test_range.rb b/test/ruby/test_range.rb
index c1d9dc1848..f58d1f817c 100644
--- a/test/ruby/test_range.rb
+++ b/test/ruby/test_range.rb
@@ -322,6 +322,15 @@ class TestRange < Test::Unit::TestCase
     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)