lib/unicode_normalize/normalize.rb: added US_ASCII

as trivially supported encoding (is always normalized,
and may appear mixed in with UTF-8 or other Unicode
encodings).

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@48134 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 4 insertions, 0 deletions

diff --git a/lib/unicode_normalize/normalize.rb b/lib/unicode_normalize/normalize.rb
index 97aaeddbee..0c99024c86 100644
--- a/lib/unicode_normalize/normalize.rb
+++ b/lib/unicode_normalize/normalize.rb
@@ -138,6 +138,8 @@ module UnicodeNormalize
       else
         raise ArgumentError, "Invalid normalization form #{form}."
       end
+    elsif encoding == Encoding::US_ASCII
+      string
     elsif  UNICODE_ENCODINGS.include? encoding
       normalize(string.encode(Encoding::UTF_8), form).encode(encoding)
     else
@@ -166,6 +168,8 @@ module UnicodeNormalize
       else
         raise ArgumentError, "Invalid normalization form #{form}."
       end
+    elsif encoding == Encoding::US_ASCII
+      true
     elsif  UNICODE_ENCODINGS.include? encoding
       normalized? string.encode(Encoding::UTF_8), form
     else