1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
|
# frozen_string_literal: true
require 'i18n/backend/base'
module I18n
begin
require 'oj'
class JSON
class << self
def encode(value)
Oj::Rails.encode(value)
end
def decode(value)
Oj.load(value)
end
end
end
rescue LoadError
require 'active_support/json'
JSON = ActiveSupport::JSON
end
module Backend
# This is a basic backend for key value stores. It receives on
# initialization the store, which should respond to three methods:
#
# * store#[](key) - Used to get a value
# * store#[]=(key, value) - Used to set a value
# * store#keys - Used to get all keys
#
# Since these stores only supports string, all values are converted
# to JSON before being stored, allowing it to also store booleans,
# hashes and arrays. However, this store does not support Procs.
#
# As the ActiveRecord backend, Symbols are just supported when loading
# translations from the filesystem or through explicit store translations.
#
# Also, avoid calling I18n.available_locales since it's a somehow
# expensive operation in most stores.
#
# == Example
#
# To setup I18n to use TokyoCabinet in memory is quite straightforward:
#
# require 'rufus/tokyo/cabinet' # gem install rufus-tokyo
# I18n.backend = I18n::Backend::KeyValue.new(Rufus::Tokyo::Cabinet.new('*'))
#
# == Performance
#
# You may make this backend even faster by including the Memoize module.
# However, notice that you should properly clear the cache if you change
# values directly in the key-store.
#
# == Subtrees
#
# In most backends, you are allowed to retrieve part of a translation tree:
#
# I18n.backend.store_translations :en, :foo => { :bar => :baz }
# I18n.t "foo" #=> { :bar => :baz }
#
# This backend supports this feature by default, but it slows down the storage
# of new data considerably and makes hard to delete entries. That said, you are
# allowed to disable the storage of subtrees on initialization:
#
# I18n::Backend::KeyValue.new(@store, false)
#
# This is useful if you are using a KeyValue backend chained to a Simple backend.
class KeyValue
module Implementation
attr_accessor :store
include Base, Flatten
def initialize(store, subtrees=true)
@store, @subtrees = store, subtrees
end
def initialized?
!@store.nil?
end
def store_translations(locale, data, options = EMPTY_HASH)
escape = options.fetch(:escape, true)
flatten_translations(locale, data, escape, @subtrees).each do |key, value|
key = "#{locale}.#{key}"
case value
when Hash
if @subtrees && (old_value = @store[key])
old_value = JSON.decode(old_value)
value = Utils.deep_merge!(Utils.deep_symbolize_keys(old_value), value) if old_value.is_a?(Hash)
end
when Proc
raise "Key-value stores cannot handle procs"
end
@store[key] = JSON.encode(value) unless value.is_a?(Symbol)
end
end
def available_locales
locales = @store.keys.map { |k| k =~ /\./; $` }
locales.uniq!
locales.compact!
locales.map! { |k| k.to_sym }
locales
end
protected
# Queries the translations from the key-value store and converts
# them into a hash such as the one returned from loading the
# haml files
def translations
@translations = Utils.deep_symbolize_keys(@store.keys.clone.map do |main_key|
main_value = JSON.decode(@store[main_key])
main_key.to_s.split(".").reverse.inject(main_value) do |value, key|
{key.to_sym => value}
end
end.inject{|hash, elem| Utils.deep_merge!(hash, elem)})
end
def init_translations
# NO OP
# This call made also inside Simple Backend and accessed by
# other plugins like I18n-js and babilu and
# to use it along with the Chain backend we need to
# provide a uniform API even for protected methods :S
end
def subtrees?
@subtrees
end
def lookup(locale, key, scope = [], options = EMPTY_HASH)
key = normalize_flat_keys(locale, key, scope, options[:separator])
value = @store["#{locale}.#{key}"]
value = JSON.decode(value) if value
if value.is_a?(Hash)
Utils.deep_symbolize_keys(value)
elsif !value.nil?
value
elsif !@subtrees
SubtreeProxy.new("#{locale}.#{key}", @store)
end
end
def pluralize(locale, entry, count)
if subtrees?
super
else
return entry unless entry.is_a?(Hash)
key = pluralization_key(entry, count)
entry[key]
end
end
end
class SubtreeProxy
def initialize(master_key, store)
@master_key = master_key
@store = store
@subtree = nil
end
def has_key?(key)
@subtree && @subtree.has_key?(key) || self[key]
end
def [](key)
unless @subtree && value = @subtree[key]
value = @store["#{@master_key}.#{key}"]
if value
value = JSON.decode(value)
(@subtree ||= {})[key] = value
end
end
value
end
def is_a?(klass)
Hash == klass || super
end
alias :kind_of? :is_a?
def instance_of?(klass)
Hash == klass || super
end
def nil?
@subtree.nil?
end
def inspect
@subtree.inspect
end
end
include Implementation
end
end
end
|
