Module: I18n::Backend::Base

### Home Classes Methods

### In Files

- lib/i18n/backend/base.rb

### Methods

- #available_locales
- #default
- #exists?
- #interpolate
- #load_file
- #load_rb
- #load_translations
- #load_yml
- #localize
- #lookup
- #pluralize
- #reload!
- #resolve
- #store_translations
- #translate

### Included Modules

- I18n::Backend::Transliterator

### Class/Module Index

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# I18n::Backend::Base

### Public Instance Methods

available_locales() click to toggle source

Returns an array of locales for which translations are available ignoring the reserved translation meta data key :i18n.

    # File lib/i18n/backend/base.rb, line 79
    def available_locales
      raise NotImplementedError
    end

exists?(locale, key) click to toggle source

    # File lib/i18n/backend/base.rb, line 45
    def exists?(locale, key)
      lookup(locale, key) != nil
    end

load_translations(*filenames) click to toggle source

Accepts a list of paths to translation files. Loads translations from plain Ruby (*.rb) or YAML files (*.yml). See load_rb and load_yml for details.

    # File lib/i18n/backend/base.rb, line 13
    def load_translations(*filenames)
      filenames = I18n.load_path if filenames.empty?
      filenames.flatten.each { |filename| load_file(filename) }
    end

localize(locale, object, format = :default, options = {}) click to toggle source

Acts the same as `strftime`, but uses a localized version of the format string. Takes a key from the date/time formats translations as a format argument (e.g., `:short` in `:'date.formats'`).

    # File lib/i18n/backend/base.rb, line 52
    def localize(locale, object, format = :default, options = {})
      raise ArgumentError, "Object must be a Date, DateTime or Time object. #{object.inspect} given." unless object.respond_to?(:strftime)

      if Symbol === format
        key  = format
        type = object.respond_to?(:sec) ? 'time' : 'date'
        options = options.merge(:raise => true, :object => object, :locale => locale)
        format  = I18n.t(:"#{type}.formats.#{key}", options)
      end

      # format = resolve(locale, object, format, options)
      format = format.to_s.gsub(/%[aAbBpP]/) do |match|
        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).upcase if object.respond_to? :hour
        when '%P' then I18n.t(:"time.#{object.hour < 12 ? :am : :pm}", :locale => locale, :format => format).downcase if object.respond_to? :hour
        end
      end

      object.strftime(format)
    end

reload!() click to toggle source

    # File lib/i18n/backend/base.rb, line 83
    def reload!
      @skip_syntax_deprecation = false
    end

store_translations(locale, data, options = {}) click to toggle source

This method receives a locale, a data hash and options for storing translations. Should be implemented

    # File lib/i18n/backend/base.rb, line 20
    def store_translations(locale, data, options = {})
      raise NotImplementedError
    end

translate(locale, key, options = {}) click to toggle source

    # File lib/i18n/backend/base.rb, line 24
    def translate(locale, key, options = {})
      raise InvalidLocale.new(locale) unless locale
      entry = key && lookup(locale, key, options[:scope], options)

      if options.empty?
        entry = resolve(locale, key, entry, options)
      else
        count, default = options.values_at(:count, :default)
        values = options.except(*RESERVED_KEYS)
        entry = entry.nil? && default ?
          default(locale, key, default, options) : resolve(locale, key, entry, options)
      end

      throw(:exception, I18n::MissingTranslation.new(locale, key, options)) if entry.nil?
      entry = entry.dup if entry.is_a?(String)

      entry = pluralize(locale, entry, count) if count
      entry = interpolate(locale, entry, values) if values
      entry
    end

### Protected Instance Methods

default(locale, object, subject, options = {}) click to toggle source

Evaluates defaults. If given subject is an Array, it walks the array and returns the first translation that can be resolved. Otherwise it tries to resolve the translation directly.

    # File lib/i18n/backend/base.rb, line 98
    def default(locale, object, subject, options = {})
      options = options.dup.reject { |key, value| key == :default }
      case subject
      when Array
        subject.each do |item|
          result = resolve(locale, object, item, options) and return result
        end and nil
      else
        resolve(locale, object, subject, options)
      end
    end

interpolate(locale, string, values = {}) click to toggle source

Interpolates values into a given string.

    interpolate "file %{file} opened by %%{user}", :file => 'test.txt', :user => 'Mr. X'
    # => "file test.txt opened by %{user}"

    # File lib/i18n/backend/base.rb, line 151
    def interpolate(locale, string, values = {})
      if string.is_a?(::String) && !values.empty?
        I18n.interpolate(string, values)
      else
        string
      end
    end

load_file(filename) click to toggle source

Loads a single translations file by delegating to load_rb or load_yml depending on the file extension and directly merges the data to the existing translations. Raises I18n::UnknownFileType for all other file extensions.

    # File lib/i18n/backend/base.rb, line 163
    def load_file(filename)
      type = File.extname(filename).tr('.', '').downcase
      raise UnknownFileType.new(type, filename) unless respond_to?(:"load_#{type}", true)
      data = send(:"load_#{type}", filename)
      unless data.is_a?(Hash)
        raise InvalidLocaleData.new(filename, 'expects it to return a hash, but does not')
      end
      data.each { |locale, d| store_translations(locale, d || {}) }
    end

load_rb(filename) click to toggle source

Loads a plain Ruby translations file. eval'ing the file must yield a Hash containing translation data with locales as toplevel keys.

    # File lib/i18n/backend/base.rb, line 175
    def load_rb(filename)
      eval(IO.read(filename), binding, filename)
    end

load_yml(filename) click to toggle source

Loads a YAML translations file. The data must have locales as toplevel keys.

    # File lib/i18n/backend/base.rb, line 181
    def load_yml(filename)
      begin
        YAML.load_file(filename)
      rescue TypeError, ScriptError, StandardError => e
        raise InvalidLocaleData.new(filename, e.inspect)
      end
    end

lookup(locale, key, scope = [], options = {}) click to toggle source

The method which actually looks up for the translation in the store.

    # File lib/i18n/backend/base.rb, line 90
    def lookup(locale, key, scope = [], options = {})
      raise NotImplementedError
    end

pluralize(locale, entry, count) click to toggle source

Picks a translation from a pluralized mnemonic subkey according to English pluralization rules :

- It will pick the :one subkey if count is equal to 1.

- It will pick the :other subkey otherwise.

- It will pick the :zero subkey in the special case where count is equal to 0 and there is a :zero subkey present. This behaviour is not stand with regards to the CLDR pluralization rules.

Other backends can implement more flexible or complex pluralization rules.

    # File lib/i18n/backend/base.rb, line 138
    def pluralize(locale, entry, count)
      return entry unless entry.is_a?(Hash) && count

      key = :zero if count == 0 && entry.has_key?(:zero)
      key ||= count == 1 ? :one : :other
      raise InvalidPluralizationData.new(entry, count) unless entry.has_key?(key)
      entry[key]
    end

resolve(locale, object, subject, options = {}) click to toggle source

Resolves a translation. If the given subject is a Symbol, it will be translated with the given options. If it is a Proc then it will be evaluated. All other subjects will be returned directly.

    # File lib/i18n/backend/base.rb, line 114
    def resolve(locale, object, subject, options = {})
      return subject if options[:resolve] == false
      result = catch(:exception) do
        case subject
        when Symbol
          I18n.translate(subject, options.merge(:locale => locale, :throw => true))
        when Proc
          date_or_time = options.delete(:object) || object
          resolve(locale, object, subject.call(date_or_time, options))
        else
          subject
        end
      end
      result unless result.is_a?(MissingTranslation)
    end

[Validate]

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