lib/twitter_cldr/shared/language_codes.rb
# encoding: UTF-8
# Copyright 2012 Twitter, Inc
# http://www.apache.org/licenses/LICENSE-2.0
module TwitterCldr
module Shared
module LanguageCodes
LANGUAGE_CODES_DUMP_PATH = File.join(TwitterCldr::RESOURCES_DIR, 'shared', 'language_codes_table.dump')
NAME_STANDARD = :name # fake standard, mostly for internal use
VALID_STANDARDS = {
bcp_47: [:bcp_47, :bcp_47_alt],
iso_639_1: [:iso_639_1],
iso_639_2: [:iso_639_2, :iso_639_2_term],
iso_639_3: [:iso_639_3]
}
VALID_STANDARDS[NAME_STANDARD] = [NAME_STANDARD]
VALID_STANDARDS.freeze
class << self
def languages
resource[NAME_STANDARD].keys
end
def valid_standard?(standard)
VALID_STANDARDS.include?(standard.to_sym)
end
def valid_code?(code, standard)
standards = validate_standard(standard)
standards.any? { |std| (resource[std] || {}).has_key?(code.to_sym) }
end
def convert(code, from_and_to = {})
from, to = extract_from_and_to_options(from_and_to)
from.each do |from_std|
to.each do |to_std|
if result = (resource[from_std] || {}).fetch(code.to_sym, {})[to_std]
return result
end
end
end
nil
end
def from_language(language, standard)
convert(language, from: NAME_STANDARD, to: standard)
end
def to_language(code, standard)
convert(code, from: standard, to: NAME_STANDARD).to_s
end
def standards_for(code, standard)
standards = validate_standard(standard)
standards.each do |std|
if found = resource[std][code.to_sym]
# exclude fake NAME_STANDARD standard
return (found.keys & VALID_STANDARDS.keys) - [NAME_STANDARD]
end
end
[]
end
def standards_for_language(language)
standards_for(language, NAME_STANDARD)
end
private
def resource
@resource ||= File.open(LANGUAGE_CODES_DUMP_PATH) { |file| Marshal.load(file.read) }
end
def extract_from_and_to_options(from_and_to)
TwitterCldr::Utils.deep_symbolize_keys(from_and_to).values_at(:from, :to).map do |standard|
raise ArgumentError, 'options :from and :to are required' if standard.nil?
validate_standard(standard)
end
end
def validate_standard(standard)
raise ArgumentError, "standard can't be nil" if standard.nil?
raise ArgumentError, "#{standard.inspect} is not a valid standard name" unless valid_standard?(standard)
VALID_STANDARDS[standard.to_sym]
end
end
end
end
end