The ruby on rails i18n core api-Neeraj Kumar

before_filter :set_locale def set_locale # if params[:locale] is nil then I18n.default_locale will be used I18n.locale = params[:locale] end

# app/controllers/application_controller.rb def default_url_options(options = {}) logger.debug “default_url_options is passed options: #{options.inspect}n” {:locale => I18n.locale} end

# config/routes.rb map.resources :books, :path_prefix => '/:locale' # => www.example.com/nl/books map.root '/:locale', :controller => “dashboard”

before_filter :set_locale def set_locale I18n.locale = extract_locale_from_uri end

def extract_locale_from_tld parsed_locale = request.host.split('.').last I18n.available_locales.include? (parsed_locale.to_sym) ? parsed_locale : nil end

def set_locale logger.debug = “* Accept-Language: #{request.env['HTTP_ACCEPT_LANGUAGE']}” I18n.locale = extract_locale_from_accept_language_header end

def extract_locale_from_accept_language_header request.env['HTTP_ACCEPT_LANGUAGE'].scan(/^[a-z] {2}/).first end

en: activerecord: models: user: foo admin: bar attributes: user: login: “Handle” # => will translate User attribute “login” as “Handle”

en: activerecord: errors: messages: blank: “can not has nottin” # => u = User.new # => #<User id:nil, etc> # => u.valid? # => false # => u.errors.on(:name) # => “can not has nottin”

en: activerecord: errors: messages: already_registered: “u already is {{model}}” # => u.errors.on(:email) # => “u already is foo”

en: activerecord: errors: template: header: one: “1 error prohibted this {{model}} from being saved” other: “{{count}} errors prohibted this {{model}} from being saved” body: “There were problems with the following fields:”

i18n i18n i18n backend backend core_ext helpers locales exceptions gettext gettext helpers tag fallbacks locale version

backend Interpolation fast simple active_record active_record compiler Interpolation gettext base compiler missing Interpolation helpers cache compiler store_procs Interpolation Interpolation cascader compiler compiler Interpolation links translation chain compiler Interpolation metadata cldr compiler Interpolation pluralization fallbacks compiler

def default_locale(locale) @@default_locale = locale.to_sym rescue nil end

def backend @@backend ||= Backend::Simple.new end

module I18n module Backend class Simple include Base end end end

def available_locales @@available_locales ||= backend.available_locales end

def default_exception_handler(exception, locale, key, options) return exception.message if MissingTranslationData === exception raise exception end

def config Thread.current[:i18n_config] ||= I18n::Config.new end

I18n.t :invalid, :scope => [:active_record, :error_messages] # => I18n.translation :invalid :active_record.error_messa ges.invalid

I18n.t :foo, :bar => 'baz' #=> 'foo baz' I18n.t :foo, :count => 1 #=> 'foo' I18n.t :foo, :count => 0 #=> 'foos' I18n.t :foo, :count => 2 #=> 'foos' I18n.t :foo, :default => 'bar'

def translate(&args) options = args.pop if args.last.is_a?(Hash) key = args.shift locale = options && options.delete(:locale) || config.locale raises = options && options.delete(:raise) config.backend.translate(locale, key, options || {}) rescue I18n::ArgumentError => exception raise exception if raises handle_exception(exception, locale, key, options) end alias :t :translate

def localize(object, options = {}) locale = options.delete(:locale) || config.locale format = options.delete(:format) || :default config.backend.localize(locale, object, format, options) end alias :l :localize

def load_translations(*filenames) filenames.each { |filename| load_file(filename) } end

def load_file(filename) type = File.extname(filename).tr('.', '').downcase raise UnknownFileType.new(type, filename) unless respond_to?(:”load_#(type)”) data = send(:”load_#(type)”, filename) data.each { |locale, d| merge_translation(locale, d) } end

def store_translations(locale, data, options = {}) merge_translations(locale, data, options) end

def merge_translations(locale, data, options = {}) locale = locale.to_sym translations[locale] ||= {} separator = options[:separator] || I18n.default_separator data = unwind_keys(data, separator) data = deep_symbolized_keys(data) merger = proc do |key, v1, v2| Hash === v1 && Hash === v2 ? v1.merge(v2, &merger) : (v2 || v1) end translations[locale].merge!(data, &merger) end

def translate(locale, key, options = {}) raise InvalidLocale.new(locale) unless locale return key.map { |k| translate(locale, k, options) } if key.is_a?(Array) if options.empty? entry = resolve(locale, key, lookup(locale, key), options) raise(I18n::MissingTranslationData.new(locale, key, options)) if entry.nil?

else count, scope, default = options.values_at(:count, :scope, :default) values = options.reject { |name, value| RESERVED_KEYS.include?(name) } entry = lookup(locale, key, scope, options) entry = entry.nil? && default ? default(locale, key, default, options) : resolve(locale, key, entry, options)

raise(I18n::MissingTranslationData.new(locale, key, options)) if entry.nil? entry = pluralize(locale, entry, count) if count entry = interpolate(locale, entry, values) if values end entry end

case match when '%a' then I18n.t(:"date.abbr_day_names”, :locale => locale, :format => format)[object.wday] when '%A' then I18n.t(:"date.day_names”, :locale => locale, :format => format)[object.wday] when '%b' then I18n.t(:"date.abbr_month_names", :locale => locale, :format => format)[object.mon]

when '%B' then I18n.t(:"date.month_names", :locale => locale, :format => format)[object.mon] when '%p' then I18n.t(:"time.#{object.hour < 12 ? :am : :pm}", :locale => locale, :format => format) if object.respond_to? :hour end

MissingTranslationData # no translation was found for the requested key InvalidLocale # the locale set to I18n.locale is invalid (e.g. nil)

I18n.backend = Globalize::Backend::Static.new

module I18n def just_raise_that_exception(*args) raise args.first end end I18n.exception_handler = :just_raise_that_exception

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The ruby on rails i18n core api-Neeraj Kumar

by ThoughtWorks on Mar 24, 2010

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The ruby on rails i18n core api-Neeraj Kumar — Presentation Transcript