From b4b556e34812a9653ba4b0a55e65aafa00524f52 Mon Sep 17 00:00:00 2001
From: Kouhei Sutou <kou@clear-code.com>
Date: Fri, 20 Sep 2013 22:04:19 +0900
Subject: [PATCH] Add private module to provide helper methods

---
 lib/locale/driver/env.rb | 15 ++++++++++++---
 1 file changed, 12 insertions(+), 3 deletions(-)

diff --git a/lib/locale/driver/env.rb b/lib/locale/driver/env.rb
index df54503..69232f5 100644
--- a/lib/locale/driver/env.rb
+++ b/lib/locale/driver/env.rb
@@ -66,12 +66,21 @@ def locales
       # * Returns: the system charset.
       def charset  # :nodoc:
         [ENV["LC_ALL"], ENV["LC_CTYPE"], ENV["LANG"]].each do |env|
-          next if env.nil?
-          next if env.empty?
-          return Locale::Tag::Posix.parse(env).charset
+          tag = Private.parse(env)
+          next if tag.nil?
+          return tag.charset
         end
         nil
       end
+
+      module Private
+        module_function
+        def parse(env_value)
+          return nil if env_value.nil?
+          return nil if env_value.empty?
+          Locale::Tag::Posix.parse(env_value)
+        end
+      end
     end
 
     MODULES[:env] = Env