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module GettextI18nRails
#translates i18n calls to gettext calls
class Backend
@@translate_defaults = true
cattr_accessor :translate_defaults
attr_accessor :backend
def initialize(*args)
self.backend = I18n::Backend::Simple.new(*args)
end
def available_locales
FastGettext.available_locales || []
end
def translate(locale, key, options)
I18n.with_locale(locale) do
if gettext_key = gettext_key(key, options)
translation =
plural_translate(gettext_key, options) || FastGettext._(gettext_key)
interpolate(translation, options)
else
result = backend.translate(locale, key, options)
if result.is_a?(String)
result = result.dup if result.frozen?
result.force_encoding("UTF-8")
else
result
end
end
end
end
def method_missing(method, *args)
backend.send(method, *args)
end
protected
def gettext_key(key, options)
flat_key = flatten_key key, options
if FastGettext.key_exist?(flat_key)
flat_key
elsif self.class.translate_defaults
[*options[:default]].each do |default|
#try the scoped(more specific) key first e.g. 'activerecord.errors.my custom message'
flat_key = flatten_key default, options
return flat_key if FastGettext.key_exist?(flat_key)
#try the short key thereafter e.g. 'my custom message'
return default if FastGettext.key_exist?(default)
end
return nil
end
end
def plural_translate(gettext_key, options)
if options[:count]
translation = FastGettext.n_(gettext_key, options[:count])
discard_pass_through_key gettext_key, translation
end
end
def discard_pass_through_key(key, translation)
if translation == key
nil
else
translation
end
end
def interpolate(string, values)
if string.respond_to?(:%)
reserved_keys = if defined?(I18n::RESERVED_KEYS) # rails 3+
I18n::RESERVED_KEYS
else
I18n::Backend::Base::RESERVED_KEYS
end
options = values.except(*reserved_keys)
options.any? ? (string % options) : string
else
string
end
end
def flatten_key key, options
scope = [*(options[:scope] || [])]
scope.empty? ? key.to_s : "#{scope*'.'}.#{key}"
end
end
end
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