* enc/unicode/case-folding.rb, casefold.h: Data generation to implement

  swapcase functionality for titlecase characters. Swapcase isn't defined
  by Unicode, because the purpose/usage of swapcase is unclear anyway.
  The implementation follows a proposal from Nobu, swaping the case of
  each component of a titlecase character individually.
  This means that the titlecase characters have to be decomposed.
* enc/unicode.c: Code using the above data.
* test/ruby/enc/test_case_mapping.rb: Tests for the above.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@54469 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 9 insertions, 0 deletions

diff --git a/enc/unicode/case-folding.rb b/enc/unicode/case-folding.rb
index 2df430185f..433ce74dfe 100755
--- a/enc/unicode/case-folding.rb
+++ b/enc/unicode/case-folding.rb
@@ -244,6 +244,15 @@ class CaseMapping
         unless item.upper == item.title
           if item.code == item.title
             flags += '|IT'
+            swap = case item.code
+            when '01C5' then '0064 017D'
+            when '01C8' then '006C 004A'
+            when '01CB' then '006E 004A'
+            when '01F2' then '0064 005A'
+            else # Greek
+              to.split(' ').first + ' 0399'
+            end
+            specials << swap
           else
             flags += '|ST'
             specials << item.title