Rework locale selection

[rails.git] / lib / locale.rb

diff --git a/lib/locale.rb b/lib/locale.rb
new file mode 100644 (file)
index 0000000..bb09ae3
--- /dev/null
+++ b/lib/locale.rb
@@ -0,0 +1,44 @@
+class Locale < I18n::Locale::Tag::Rfc4646
+  class List < Array
+    attr_reader :locales
+
+    def initialize(tags)
+      super(tags.map { |tag| Locale.tag(tag) })
+    end
+
+    def candidates(preferred)
+      preferred.expand & self
+    end
+
+    def preferred(preferred)
+      candidates(preferred).first
+    end
+
+    def expand
+      map(&:candidates).flatten.uniq << Locale.default
+    end
+  end
+
+  def self.list(*tags)
+    List.new(tags.flatten)
+  end
+
+  def self.default
+    tag(I18n.default_locale)
+  end
+
+  def self.available
+    @available ||= List.new(I18n.available_locales)
+  end
+
+  def candidates
+    [self.class.new(language, script, region, variant),
+     self.class.new(language, script, region),
+     self.class.new(language, script, nil, variant),
+     self.class.new(language, script),
+     self.class.new(language, nil, region, variant),
+     self.class.new(language, nil, region),
+     self.class.new(language, nil, nil, variant),
+     self.class.new(language)]
+  end
+end