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bin/gems/i18n-1.15.2/lib/i18n/locale/fallbacks.rb

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+# Locale Fallbacks
+#
+# Extends the I18n module to hold a fallbacks instance which is set to an
+# instance of I18n::Locale::Fallbacks by default but can be swapped with a
+# different implementation.
+#
+# Locale fallbacks will compute a number of fallback locales for a given locale.
+# For example:
+#
+# <pre><code>
+# I18n.fallbacks[:"es-MX"] # => [:"es-MX", :es, :en] </code></pre>
+#
+# Locale fallbacks always fall back to
+#
+#   * all parent locales of a given locale (e.g. :es for :"es-MX") first,
+#   * the current default locales and all of their parents second
+#
+# The default locales are set to [] by default but can be set to something else.
+#
+# One can additionally add any number of additional fallback locales manually.
+# These will be added before the default locales to the fallback chain. For
+# example:
+#
+#   # using a custom locale as default fallback locale
+#
+#   I18n.fallbacks = I18n::Locale::Fallbacks.new(:"en-GB", :"de-AT" => :de, :"de-CH" => :de)
+#   I18n.fallbacks[:"de-AT"] # => [:"de-AT", :de, :"en-GB", :en]
+#   I18n.fallbacks[:"de-CH"] # => [:"de-CH", :de, :"en-GB", :en]
+#
+#   # mapping fallbacks to an existing instance
+#
+#   # people speaking Catalan also speak Spanish as spoken in Spain
+#   fallbacks = I18n.fallbacks
+#   fallbacks.map(:ca => :"es-ES")
+#   fallbacks[:ca] # => [:ca, :"es-ES", :es, :"en-US", :en]
+#
+#   # people speaking Arabian as spoken in Palestine also speak Hebrew as spoken in Israel
+#   fallbacks.map(:"ar-PS" => :"he-IL")
+#   fallbacks[:"ar-PS"] # => [:"ar-PS", :ar, :"he-IL", :he, :"en-US", :en]
+#   fallbacks[:"ar-EG"] # => [:"ar-EG", :ar, :"en-US", :en]
+#
+#   # people speaking Sami as spoken in Finland also speak Swedish and Finnish as spoken in Finland
+#   fallbacks.map(:sms => [:"se-FI", :"fi-FI"])
+#   fallbacks[:sms] # => [:sms, :"se-FI", :se, :"fi-FI", :fi, :"en-US", :en]
+
+module I18n
+  module Locale
+    class Fallbacks < Hash
+      def initialize(*mappings)
+        @map = {}
+        map(mappings.pop) if mappings.last.is_a?(Hash)
+        self.defaults = mappings.empty? ? [] : mappings
+      end
+
+      def defaults=(defaults)
+        @defaults = defaults.flat_map { |default| compute(default, false) }
+      end
+      attr_reader :defaults
+
+      def [](locale)
+        raise InvalidLocale.new(locale) if locale.nil?
+        raise Disabled.new('fallback#[]') if locale == false
+        locale = locale.to_sym
+        super || store(locale, compute(locale))
+      end
+
+      def map(*args, &block)
+        if args.count == 1 && !block_given?
+          mappings = args.first
+          mappings.each do |from, to|
+            from, to = from.to_sym, Array(to)
+            to.each do |_to|
+              @map[from] ||= []
+              @map[from] << _to.to_sym
+            end
+          end
+        else
+          @map.map(*args, &block)
+        end
+      end
+
+      def empty?
+        @map.empty? && @defaults.empty?
+      end
+
+      def inspect
+       "#<#{self.class.name} @map=#{@map.inspect} @defaults=#{@defaults.inspect}>"
+      end
+
+      protected
+
+      def compute(tags, include_defaults = true, exclude = [])
+        result = []
+        Array(tags).each do |tag|
+          tags = I18n::Locale::Tag.tag(tag).self_and_parents.map! { |t| t.to_sym } - exclude
+          result += tags
+          tags.each { |_tag| result += compute(@map[_tag], false, exclude + result) if @map[_tag] }
+        end
+
+        result.push(*defaults) if include_defaults
+        result.uniq!
+        result.compact!
+        result
+      end
+    end
+  end
+end

bin/gems/i18n-1.15.2/lib/i18n/locale/tag.rb

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+# encoding: utf-8
+
+module I18n
+  module Locale
+    module Tag
+      autoload :Parents, 'i18n/locale/tag/parents'
+      autoload :Rfc4646, 'i18n/locale/tag/rfc4646'
+      autoload :Simple,  'i18n/locale/tag/simple'
+
+      class << self
+        # Returns the current locale tag implementation. Defaults to +I18n::Locale::Tag::Simple+.
+        def implementation
+          @@implementation ||= Simple
+        end
+
+        # Sets the current locale tag implementation. Use this to set a different locale tag implementation.
+        def implementation=(implementation)
+          @@implementation = implementation
+        end
+
+        # Factory method for locale tags. Delegates to the current locale tag implementation.
+        def tag(tag)
+          implementation.tag(tag)
+        end
+      end
+    end
+  end
+end

bin/gems/i18n-1.15.2/lib/i18n/locale/tag/parents.rb

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+module I18n
+  module Locale
+    module Tag
+      module Parents
+        def parent
+          @parent ||=
+            begin
+              segs = to_a
+              segs.compact!
+              segs.length > 1 ? self.class.tag(*segs[0..(segs.length - 2)].join('-')) : nil
+            end
+        end
+
+        def self_and_parents
+          @self_and_parents ||= [self].concat parents
+        end
+
+        def parents
+          @parents ||= parent ? [parent].concat(parent.parents) : []
+        end
+      end
+    end
+  end
+end

bin/gems/i18n-1.15.2/lib/i18n/locale/tag/rfc4646.rb

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+# RFC 4646/47 compliant Locale tag implementation that parses locale tags to
+# subtags such as language, script, region, variant etc.
+#
+# For more information see by http://en.wikipedia.org/wiki/IETF_language_tag
+#
+# Rfc4646::Parser does not implement grandfathered tags.
+
+module I18n
+  module Locale
+    module Tag
+      RFC4646_SUBTAGS = [ :language, :script, :region, :variant, :extension, :privateuse, :grandfathered ]
+      RFC4646_FORMATS = { :language => :downcase, :script => :capitalize, :region => :upcase, :variant => :downcase }
+
+      class Rfc4646 < Struct.new(*RFC4646_SUBTAGS)
+        class << self
+          # Parses the given tag and returns a Tag instance if it is valid.
+          # Returns false if the given tag is not valid according to RFC 4646.
+          def tag(tag)
+            matches = parser.match(tag)
+            new(*matches) if matches
+          end
+
+          def parser
+            @@parser ||= Rfc4646::Parser
+          end
+
+          def parser=(parser)
+            @@parser = parser
+          end
+        end
+
+        include Parents
+
+        RFC4646_FORMATS.each do |name, format|
+          define_method(name) { self[name].send(format) unless self[name].nil? }
+        end
+
+        def to_sym
+          to_s.to_sym
+        end
+
+        def to_s
+          @tag ||= to_a.compact.join("-")
+        end
+
+        def to_a
+          members.collect { |attr| self.send(attr) }
+        end
+
+        module Parser
+          PATTERN = %r{\A(?:
+            ([a-z]{2,3}(?:(?:-[a-z]{3}){0,3})?|[a-z]{4}|[a-z]{5,8}) # language
+            (?:-([a-z]{4}))?                                        # script
+            (?:-([a-z]{2}|\d{3}))?                                  # region
+            (?:-([0-9a-z]{5,8}|\d[0-9a-z]{3}))*                     # variant
+            (?:-([0-9a-wyz](?:-[0-9a-z]{2,8})+))*                   # extension
+            (?:-(x(?:-[0-9a-z]{1,8})+))?|                           # privateuse subtag
+            (x(?:-[0-9a-z]{1,8})+)|                                 # privateuse tag
+            /* ([a-z]{1,3}(?:-[0-9a-z]{2,8}){1,2}) */               # grandfathered
+            )\z}xi
+
+          class << self
+            def match(tag)
+              c = PATTERN.match(tag.to_s).captures
+              c[0..4] << (c[5].nil? ? c[6] : c[5])  << c[7] # TODO c[7] is grandfathered, throw a NotImplemented exception here?
+            rescue
+              false
+            end
+          end
+        end
+      end
+    end
+  end
+end

bin/gems/i18n-1.15.2/lib/i18n/locale/tag/simple.rb

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+# Simple Locale tag implementation that computes subtags by simply splitting
+# the locale tag at '-' occurrences.
+module I18n
+  module Locale
+    module Tag
+      class Simple
+        class << self
+          def tag(tag)
+            new(tag)
+          end
+        end
+
+        include Parents
+
+        attr_reader :tag
+
+        def initialize(*tag)
+          @tag = tag.join('-').to_sym
+        end
+
+        def subtags
+          @subtags = tag.to_s.split('-').map!(&:to_s)
+        end
+
+        def to_sym
+          tag
+        end
+
+        def to_s
+          tag.to_s
+        end
+
+        def to_a
+          subtags
+        end
+      end
+    end
+  end
+end