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require 'globalize/locale/language_tag'
module I18n
@@fallbacks = nil
class << self
# Returns the current fallbacks. Defaults to +Globalize::Locale::Fallbacks+.
def fallbacks
@@fallbacks ||= Globalize::Locale::Fallbacks.new
end
# Sets the current fallbacks. Used to set a custom fallbacks instance.
def fallbacks=(fallbacks)
@@fallbacks = fallbacks
end
end
end
module Globalize
module Locale
class Fallbacks < Hash
def initialize(*defaults)
@map = {}
map defaults.pop if defaults.last.is_a?(Hash)
defaults = [I18n.default_locale.to_sym] if defaults.empty?
self.defaults = defaults
end
def defaults=(defaults)
@defaults = defaults.map{|default| compute(default, false) }.flatten << :root
end
attr_reader :defaults
def [](tag)
tag = tag.to_sym
has_key?(tag) ? fetch(tag) : store(tag, compute(tag))
end
def map(mappings)
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
end
protected
def compute(tags, include_defaults = true)
result = Array(tags).collect do |tag|
tags = LanguageTag::tag(tag.to_sym).parents(true).map! {|t| t.to_sym }
tags.each{|tag| tags += compute(@map[tag]) if @map[tag] }
tags
end.flatten
result.push *defaults if include_defaults
result.uniq
end
end
end
end
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