* test/ruby/enc/test_regex_casefold.rb: Added data-based testing for

String#downcase :fold.
* enc/unicode.c: Fixed a range error (lowest non-ASCII character affected
  by case operations is U+00B5, MICRO SIGN)
* test/ruby/enc/test_case_mapping.rb: Explicit test for case folding of
  MICRO SIGN to Greek mu.
(with Kimihito Matsui)


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@53749 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,15 @@
+Sat Feb  6 15:18:28 2016  Martin Duerst  <duerst@it.aoyama.ac.jp>
+
+	* test/ruby/enc/test_regex_casefold.rb: Added data-based testing for
+	  String#downcase :fold.
+
+	* enc/unicode.c: Fixed a range error (lowest non-ASCII character affected
+	  by case operations is U+00B5, MICRO SIGN)
+
+	* test/ruby/enc/test_case_mapping.rb: Explicit test for case folding of
+	  MICRO SIGN to Greek mu.
+	(with Kimihito Matsui)
+
 Sat Feb  6 14:51:23 2016  Martin Duerst  <duerst@it.aoyama.ac.jp>
 
 	* test/ruby/enc/test_regex_casefold.rb: Tests for three case folding

enc/unicode.c

@@ -645,7 +645,7 @@ onigenc_unicode_case_map(OnigCaseFoldType* flagP,
 		}
 	    }
 	}
-	else if (!(flags&ONIGENC_CASE_ASCII_ONLY) && code>=0x00C0) { /* deal with non-ASCII; nothing relevant below U+00C0 */
+	else if (!(flags&ONIGENC_CASE_ASCII_ONLY) && code>=0x00B5) { /* deal with non-ASCII; micron sign (U+00B5) is lowest affected */
 	    const CodePointList3 *folded;
 
 	    if (code==0x0130) {

test/ruby/enc/test_case_mapping.rb

@@ -63,6 +63,7 @@ class TestCaseMappingPreliminary < Test::Unit::TestCase
     check_downcase_properties   'ss', 'ß', :fold
     check_downcase_properties   'fifl', 'fifl', :fold
     check_downcase_properties   'σ', 'ς', :fold
+    check_downcase_properties   'μ', 'µ', :fold # MICRO SIGN -> Greek mu
   end
 
   def test_turcic

test/ruby/enc/test_regex_casefold.rb

@@ -8,6 +8,15 @@ class TestCaseFold < Test::Unit::TestCase
   UNICODE_VERSION = UnicodeNormalize::UNICODE_VERSION
   CaseTest = Struct.new :source, :target, :kind, :line
 
+  def check_downcase_properties(expected, start, *flags)
+    assert_equal expected, start.downcase(*flags)
+    temp = start
+    assert_equal expected, temp.downcase!(*flags)
+    assert_equal expected, expected.downcase(*flags)
+    temp = expected
+    assert_nil   temp.downcase!(*flags)
+  end
+
   def read_tests
     IO.readlines(File.expand_path("../../../enc/unicode/data/#{UNICODE_VERSION}/CaseFolding.txt", __dir__))
     .collect.with_index { |linedata, linenumber| [linenumber.to_i+1, linedata.chomp] }
@@ -75,7 +84,12 @@ class TestCaseFold < Test::Unit::TestCase
         end
       end
     end
+  end
 
+  def test_downcase_fold
+    @@tests.each do |test|
+      check_downcase_properties test.target, test.source, :fold
+    end
   end
 
   # start with good encodings only