-module HttpAcceptLanguage
-
- # Returns a sorted array based on user preference in HTTP_ACCEPT_LANGUAGE.
- # Browsers send this HTTP header, so don't think this is holy.
- #
- # Example:
- #
- # request.user_preferred_languages
- # # => [ 'nl-NL', 'nl-BE', 'nl', 'en-US', 'en' ]
- #
- def user_preferred_languages
- @user_preferred_languages ||= env['HTTP_ACCEPT_LANGUAGE'].split(',').collect do |l|
- l += ';q=1.0' unless l =~ /;q=\d+\.\d+$/
- l.split(';q=')
- end.sort do |x,y|
- raise "Not correctly formatted" unless x.first =~ /^[a-z\-]+$/i
- y.last.to_f <=> x.last.to_f
- end.collect do |l|
- l.first.downcase.gsub(/-[a-z]+$/i) { |x| x.upcase }
- end
- rescue # Just rescue anything if the browser messed up badly.
- []
- end
-
- # Sets the user languages preference, overiding the browser
- #
- def user_preferred_languages=(languages)
- @user_preferred_languages = languages
- end
-
- # Finds the locale specifically requested by the browser.
- #
- # Example:
- #
- # request.preferred_language_from I18n.available_locales
- # # => 'nl'
- #
- def preferred_language_from(array)
- (user_preferred_languages & array.collect { |i| i.to_s }).first
- end
-
- # Returns the first of the user_preferred_languages that is compatible
- # with the available locales. Ignores region.
- #
- # Example:
- #
- # request.compatible_language_from I18n.available_locales
- #
- def compatible_language_from(array)
- user_preferred_languages.find do |x|
- array.find { |y| y.to_s == x.to_s } ||
- array.find { |y| y.to_s =~ /^#{Regexp.escape(x.to_s)}-/ }
- end
- end
-
-end