Regexp supports Unicoe 9.0.0's \X

* meta character \X matches Unicode 9.0.0 characters with some workarounds
  for UTR #51 Unicode Emoji, Version 4.0 emoji zwj sequences.
  [Feature #12831] [ruby-core:77586]

The term "character" can have many meanings bytes, codepoints, combined
characters, and so on. "grapheme cluster" is highest one of such words,
which means user-perceived characters.
Unicode Standard Annex #29 UNICODE TEXT SEGMENTATION specifies how to
handle grapheme clusters (extended grapheme cluster).
But some specs aren't updated to current situation because Unicode Emoji
is rapidly extended without well definition.
It breaks the precondition of UTR#29 "Grapheme cluster boundaries can be
easily tested by looking at immediately adjacent characters". (the
sentence will be removed in the next version)
Though some of its detail are described in Unicode Technical Report #51
UNICODE EMOJI but it is not merged into UTR#29 yet.

http://unicode.org/reports/tr29/
http://unicode.org/reports/tr51/
http://unicode.org/Public/emoji/4.0/

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@56949 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 21 insertions, 0 deletions

diff --git a/test/ruby/test_regexp.rb b/test/ruby/test_regexp.rb
index 4853c41b86..d95f9d7dd4 100644
--- a/test/ruby/test_regexp.rb
+++ b/test/ruby/test_regexp.rb
@@ -900,6 +900,27 @@ class TestRegexp < Test::Unit::TestCase
     assert_no_match(/[[:ascii:]]/, "\x80\xFF")
   end
 
+  def test_cclass_R
+    assert_match /\A\R\z/, "\r"
+    assert_match /\A\R\z/, "\n"
+    assert_match /\A\R\z/, "\r\n"
+  end
+
+  def test_cclass_X
+    assert_match /\A\X\z/, "\u{20 200d}"
+    assert_match /\A\X\z/, "\u{600 600}"
+    assert_match /\A\X\z/, "\u{600 20}"
+    assert_match /\A\X\z/, "\u{261d 1F3FB}"
+    assert_match /\A\X\z/, "\u{1f600}"
+    assert_match /\A\X\z/, "\u{20 308}"
+    assert_match /\A\X\X\z/, "\u{a 308}"
+    assert_match /\A\X\X\z/, "\u{d 308}"
+    assert_match /\A\X\z/, "\u{1F477 1F3FF 200D 2640 FE0F}"
+    assert_match /\A\X\z/, "\u{1F468 200D 1F393}"
+    assert_match /\A\X\z/, "\u{1F46F 200D 2642 FE0F}"
+    assert_match /\A\X\z/, "\u{1f469 200d 2764 fe0f 200d 1f469}"
+  end
+
   def test_backward
     assert_equal(3, "foobar".rindex(/b.r/i))
     assert_equal(nil, "foovar".rindex(/b.r/i))