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# frozen_string_literal: true
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require 'i18n/backend/base'
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module I18n
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begin
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require 'oj'
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class JSON
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class << self
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def encode(value)
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Oj::Rails.encode(value)
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end
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def decode(value)
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Oj.load(value)
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end
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end
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end
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rescue LoadError
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require 'active_support/json'
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JSON = ActiveSupport::JSON
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end
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module Backend
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# This is a basic backend for key value stores. It receives on
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# initialization the store, which should respond to three methods:
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#
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# * store#[](key) - Used to get a value
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# * store#[]=(key, value) - Used to set a value
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# * store#keys - Used to get all keys
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#
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# Since these stores only supports string, all values are converted
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# to JSON before being stored, allowing it to also store booleans,
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# hashes and arrays. However, this store does not support Procs.
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#
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# As the ActiveRecord backend, Symbols are just supported when loading
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# translations from the filesystem or through explicit store translations.
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#
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# Also, avoid calling I18n.available_locales since it's a somehow
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# expensive operation in most stores.
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#
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# == Example
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#
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# To setup I18n to use TokyoCabinet in memory is quite straightforward:
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#
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# require 'rufus/tokyo/cabinet' # gem install rufus-tokyo
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# I18n.backend = I18n::Backend::KeyValue.new(Rufus::Tokyo::Cabinet.new('*'))
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#
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# == Performance
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#
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# You may make this backend even faster by including the Memoize module.
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# However, notice that you should properly clear the cache if you change
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# values directly in the key-store.
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#
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# == Subtrees
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#
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# In most backends, you are allowed to retrieve part of a translation tree:
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#
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# I18n.backend.store_translations :en, :foo => { :bar => :baz }
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# I18n.t "foo" #=> { :bar => :baz }
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#
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# This backend supports this feature by default, but it slows down the storage
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# of new data considerably and makes hard to delete entries. That said, you are
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# allowed to disable the storage of subtrees on initialization:
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#
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# I18n::Backend::KeyValue.new(@store, false)
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#
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# This is useful if you are using a KeyValue backend chained to a Simple backend.
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class KeyValue
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module Implementation
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attr_accessor :store
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include Base, Flatten
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def initialize(store, subtrees=true)
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@store, @subtrees = store, subtrees
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end
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def initialized?
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!@store.nil?
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end
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def store_translations(locale, data, options = EMPTY_HASH)
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escape = options.fetch(:escape, true)
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flatten_translations(locale, data, escape, @subtrees).each do |key, value|
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key = "#{locale}.#{key}"
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case value
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when Hash
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if @subtrees && (old_value = @store[key])
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old_value = JSON.decode(old_value)
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value = Utils.deep_merge!(Utils.deep_symbolize_keys(old_value), value) if old_value.is_a?(Hash)
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end
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when Proc
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raise "Key-value stores cannot handle procs"
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end
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@store[key] = JSON.encode(value) unless value.is_a?(Symbol)
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end
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end
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def available_locales
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locales = @store.keys.map { |k| k =~ /\./; $` }
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locales.uniq!
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locales.compact!
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locales.map! { |k| k.to_sym }
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locales
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end
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protected
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# Queries the translations from the key-value store and converts
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# them into a hash such as the one returned from loading the
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# haml files
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def translations
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@translations = Utils.deep_symbolize_keys(@store.keys.clone.map do |main_key|
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main_value = JSON.decode(@store[main_key])
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main_key.to_s.split(".").reverse.inject(main_value) do |value, key|
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{key.to_sym => value}
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end
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end.inject{|hash, elem| Utils.deep_merge!(hash, elem)})
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end
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def init_translations
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# NO OP
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# This call made also inside Simple Backend and accessed by
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# other plugins like I18n-js and babilu and
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# to use it along with the Chain backend we need to
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# provide a uniform API even for protected methods :S
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end
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def subtrees?
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@subtrees
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end
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def lookup(locale, key, scope = [], options = EMPTY_HASH)
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key = normalize_flat_keys(locale, key, scope, options[:separator])
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value = @store["#{locale}.#{key}"]
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value = JSON.decode(value) if value
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if value.is_a?(Hash)
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Utils.deep_symbolize_keys(value)
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elsif !value.nil?
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value
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elsif !@subtrees
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SubtreeProxy.new("#{locale}.#{key}", @store)
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end
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end
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def pluralize(locale, entry, count)
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if subtrees?
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super
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else
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return entry unless entry.is_a?(Hash)
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key = pluralization_key(entry, count)
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entry[key]
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end
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end
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end
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class SubtreeProxy
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def initialize(master_key, store)
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@master_key = master_key
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@store = store
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@subtree = nil
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end
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def has_key?(key)
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@subtree && @subtree.has_key?(key) || self[key]
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end
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def [](key)
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unless @subtree && value = @subtree[key]
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value = @store["#{@master_key}.#{key}"]
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if value
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value = JSON.decode(value)
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(@subtree ||= {})[key] = value
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end
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end
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value
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end
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def is_a?(klass)
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Hash == klass || super
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end
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alias :kind_of? :is_a?
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def instance_of?(klass)
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Hash == klass || super
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end
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def nil?
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@subtree.nil?
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end
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def inspect
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@subtree.inspect
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end
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end
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include Implementation
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end
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end
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end
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