Update Unicode Version to 9.0.0#27822
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jeremy
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Do we have test coverage demonstrating these grapheme cluster boundary rules?
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It seems that http://www.unicode.org/Public/9.0.0/ucd/auxiliary/GraphemeBreakTest.txt covers all lines of unpack_graphemes:
Following diff is how I got the coverage:
diff --git a/Gemfile b/Gemfile
index 2a42a4aea0..2aaf64360a 100644
--- a/Gemfile
+++ b/Gemfile
@@ -151,3 +151,5 @@ end
gem "ibm_db" if ENV["IBM_DB"]
gem "tzinfo-data", platforms: [:mingw, :mswin, :x64_mingw, :jruby]
gem "wdm", ">= 0.1.0", platforms: [:mingw, :mswin, :x64_mingw, :mswin64]
+
+gem "simplecov"
diff --git a/activesupport/cov.rb b/activesupport/cov.rb
new file mode 100644
index 0000000000..f5911a16c3
--- /dev/null
+++ b/activesupport/cov.rb
@@ -0,0 +1,7 @@
+$LOAD_PATH << "test"
+
+require "simplecov"
+
+SimpleCov.start
+
+load "test/multibyte_grapheme_break_conformance_test.rb"$ cd activesupport
$ bundle exec ruby cov.rb
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Worth noting how this affects grapheme cluster boundaries.
Notably, this will change string.mb_chars.grapheme_length and string.mb_chars.reverse—perhaps fixing them to work with clusters like 👩👩👧👦!
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I added some notes 😄
9.0.0 was released on June 21, 2016 http://blog.unicode.org/2016/06/announcing-unicode-standard-version-90.html http://www.unicode.org/versions/Unicode9.0.0/ There are some changes about grapheme cluster in Unicode 9.0.0: http://unicode.org/reports/tr29/#Grapheme_Cluster_Boundary_Rules ------------ I noticed that `unpack_graphemes` returns [Other] when the argument is Other ÷ Prepend (it must be [Other, Prepend]). But in [Unicode 8.0.0's Prepend has no characters](http://www.unicode.org/reports/tr29/tr29-27.html#Prepend) so we don't have to backport following patch: ```diff should_break = + if pos == eoc + true ```
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Jan 30, 2017
| "👩👩👧👦".mb_chars.reverse # => "👩👩👧👦" | ||
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| *Fumiaki MATSUSHIMA* | ||
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Summary
9.0.0 was released on June 21, 2016
http://blog.unicode.org/2016/06/announcing-unicode-standard-version-90.html
http://www.unicode.org/versions/Unicode9.0.0/
There are some changes about grapheme cluster in Unicode 9.0.0:
http://unicode.org/reports/tr29/#Grapheme_Cluster_Boundary_Rules
Other Information
I noticed that
unpack_graphemeswill return [Other] when the argument is Other ÷ Prepend(it must be [Other, Prepend]).
But in Unicode 8.0.0's Prepend has no characters
so we don't have to backport following patch:
If we support Ruby 2.4 only, we can simply replace
unpack_graphemeswith Ruby'sscan(/\X/)😉(@nurse implemented grapheme extended cluster on 2.4! )
https://bugs.ruby-lang.org/issues/12831
See #26743 for more information about replacing
AS::Multibytewith Ruby's feature.I'm not unicode expert so I'm very happy if you review this PR carefully 🙏