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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
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