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
|
#--
# Authors:: Matt Aimonetti (http://railsontherun.com/),
# Sven Fuchs (http://www.artweb-design.de),
# Joshua Harvey (http://www.workingwithrails.com/person/759-joshua-harvey),
# Saimon Moore (http://saimonmoore.net),
# Stephan Soller (http://www.arkanis-development.de/)
# Copyright:: Copyright (c) 2008 The Ruby i18n Team
# License:: MIT
#++
module I18n
autoload :ArgumentError, 'i18n/exceptions'
module Backend
autoload :Simple, 'i18n/backend/simple'
end
@@backend = nil
@@load_path = nil
@@default_locale = :'en'
@@exception_handler = :default_exception_handler
class << self
# Returns the current backend. Defaults to +Backend::Simple+.
def backend
@@backend ||= Backend::Simple.new
end
# Sets the current backend. Used to set a custom backend.
def backend=(backend)
@@backend = backend
end
# Returns the current default locale. Defaults to :'en'
def default_locale
@@default_locale
end
# Sets the current default locale. Used to set a custom default locale.
def default_locale=(locale)
@@default_locale = locale
end
# Returns the current locale. Defaults to I18n.default_locale.
def locale
Thread.current[:locale] ||= default_locale
end
# Sets the current locale pseudo-globally, i.e. in the Thread.current hash.
def locale=(locale)
Thread.current[:locale] = locale
end
# Returns an array of locales for which translations are available
def available_locales
backend.available_locales
end
# Sets the exception handler.
def exception_handler=(exception_handler)
@@exception_handler = exception_handler
end
# Allow clients to register paths providing translation data sources. The
# backend defines acceptable sources.
#
# E.g. the provided SimpleBackend accepts a list of paths to translation
# files which are either named *.rb and contain plain Ruby Hashes or are
# named *.yml and contain YAML data. So for the SimpleBackend clients may
# register translation files like this:
# I18n.load_path << 'path/to/locale/en.yml'
def load_path
@@load_path ||= []
end
# Sets the load path instance. Custom implementations are expected to
# behave like a Ruby Array.
def load_path=(load_path)
@@load_path = load_path
end
# Tells the backend to reload translations. Used in situations like the
# Rails development environment. Backends can implement whatever strategy
# is useful.
def reload!
backend.reload!
end
# Translates, pluralizes and interpolates a given key using a given locale,
# scope, and default, as well as interpolation values.
#
# *LOOKUP*
#
# Translation data is organized as a nested hash using the upper-level keys
# as namespaces. <em>E.g.</em>, ActionView ships with the translation:
# <tt>:date => {:formats => {:short => "%b %d"}}</tt>.
#
# Translations can be looked up at any level of this hash using the key argument
# and the scope option. <em>E.g.</em>, in this example <tt>I18n.t :date</tt>
# returns the whole translations hash <tt>{:formats => {:short => "%b %d"}}</tt>.
#
# Key can be either a single key or a dot-separated key (both Strings and Symbols
# work). <em>E.g.</em>, the short format can be looked up using both:
# I18n.t 'date.formats.short'
# I18n.t :'date.formats.short'
#
# Scope can be either a single key, a dot-separated key or an array of keys
# or dot-separated keys. Keys and scopes can be combined freely. So these
# examples will all look up the same short date format:
# I18n.t 'date.formats.short'
# I18n.t 'formats.short', :scope => 'date'
# I18n.t 'short', :scope => 'date.formats'
# I18n.t 'short', :scope => %w(date formats)
#
# *INTERPOLATION*
#
# Translations can contain interpolation variables which will be replaced by
# values passed to #translate as part of the options hash, with the keys matching
# the interpolation variable names.
#
# <em>E.g.</em>, with a translation <tt>:foo => "foo {{bar}}"</tt> the option
# value for the key +bar+ will be interpolated into the translation:
# I18n.t :foo, :bar => 'baz' # => 'foo baz'
#
# *PLURALIZATION*
#
# Translation data can contain pluralized translations. Pluralized translations
# are arrays of singluar/plural versions of translations like <tt>['Foo', 'Foos']</tt>.
#
# Note that <tt>I18n::Backend::Simple</tt> only supports an algorithm for English
# pluralization rules. Other algorithms can be supported by custom backends.
#
# This returns the singular version of a pluralized translation:
# I18n.t :foo, :count => 1 # => 'Foo'
#
# These both return the plural version of a pluralized translation:
# I18n.t :foo, :count => 0 # => 'Foos'
# I18n.t :foo, :count => 2 # => 'Foos'
#
# The <tt>:count</tt> option can be used both for pluralization and interpolation.
# <em>E.g.</em>, with the translation
# <tt>:foo => ['{{count}} foo', '{{count}} foos']</tt>, count will
# be interpolated to the pluralized translation:
# I18n.t :foo, :count => 1 # => '1 foo'
#
# *DEFAULTS*
#
# This returns the translation for <tt>:foo</tt> or <tt>default</tt> if no translation was found:
# I18n.t :foo, :default => 'default'
#
# This returns the translation for <tt>:foo</tt> or the translation for <tt>:bar</tt> if no
# translation for <tt>:foo</tt> was found:
# I18n.t :foo, :default => :bar
#
# Returns the translation for <tt>:foo</tt> or the translation for <tt>:bar</tt>
# or <tt>default</tt> if no translations for <tt>:foo</tt> and <tt>:bar</tt> were found.
# I18n.t :foo, :default => [:bar, 'default']
#
# <b>BULK LOOKUP</b>
#
# This returns an array with the translations for <tt>:foo</tt> and <tt>:bar</tt>.
# I18n.t [:foo, :bar]
#
# Can be used with dot-separated nested keys:
# I18n.t [:'baz.foo', :'baz.bar']
#
# Which is the same as using a scope option:
# I18n.t [:foo, :bar], :scope => :baz
def translate(key, options = {})
locale = options.delete(:locale) || I18n.locale
backend.translate(locale, key, options)
rescue I18n::ArgumentError => e
raise e if options[:raise]
send(@@exception_handler, e, locale, key, options)
end
alias :t :translate
# Localizes certain objects, such as dates and numbers to local formatting.
def localize(object, options = {})
locale = options[:locale] || I18n.locale
format = options[:format] || :default
backend.localize(locale, object, format)
end
alias :l :localize
protected
# Handles exceptions raised in the backend. All exceptions except for
# MissingTranslationData exceptions are re-raised. When a MissingTranslationData
# was caught and the option :raise is not set the handler returns an error
# message string containing the key/scope.
def default_exception_handler(exception, locale, key, options)
return exception.message if MissingTranslationData === exception
raise exception
end
# Merges the given locale, key and scope into a single array of keys.
# Splits keys that contain dots into multiple keys. Makes sure all
# keys are Symbols.
def normalize_translation_keys(locale, key, scope)
keys = [locale] + Array(scope) + [key]
keys = keys.map { |k| k.to_s.split(/\./) }
keys.flatten.map { |k| k.to_sym }
end
end
end
|