118 lines
2.9 KiB
Ruby
118 lines
2.9 KiB
Ruby
# typed: true
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# frozen_string_literal: true
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# Representation of a system locale.
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#
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# Used to compare the system language and languages defined using the cask `language` stanza.
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#
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# @api private
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class Locale
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extend T::Sig
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# Error when a string cannot be parsed to a `Locale`.
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class ParserError < StandardError
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end
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# ISO 639-1 or ISO 639-2
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LANGUAGE_REGEX = /(?:[a-z]{2,3})/.freeze
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private_constant :LANGUAGE_REGEX
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# ISO 3166-1 or UN M.49
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REGION_REGEX = /(?:[A-Z]{2}|\d{3})/.freeze
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private_constant :REGION_REGEX
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# ISO 15924
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SCRIPT_REGEX = /(?:[A-Z][a-z]{3})/.freeze
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private_constant :SCRIPT_REGEX
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LOCALE_REGEX = /\A((?:#{LANGUAGE_REGEX}|#{REGION_REGEX}|#{SCRIPT_REGEX})(?:-|$)){1,3}\Z/.freeze
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private_constant :LOCALE_REGEX
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def self.parse(string)
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if (locale = try_parse(string))
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return locale
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end
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raise ParserError, "'#{string}' cannot be parsed to a #{self}"
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end
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sig { params(string: String).returns(T.nilable(T.attached_class)) }
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def self.try_parse(string)
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return if string.blank?
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scanner = StringScanner.new(string)
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if (language = scanner.scan(LANGUAGE_REGEX))
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sep = scanner.scan(/-/)
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return if (sep && scanner.eos?) || (sep.nil? && !scanner.eos?)
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end
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if (script = scanner.scan(SCRIPT_REGEX))
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sep = scanner.scan(/-/)
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return if (sep && scanner.eos?) || (sep.nil? && !scanner.eos?)
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end
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region = scanner.scan(REGION_REGEX)
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return unless scanner.eos?
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new(language, region, script)
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end
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attr_reader :language, :region, :script
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def initialize(language, region, script)
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raise ArgumentError, "#{self.class} cannot be empty" if language.nil? && region.nil? && script.nil?
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{
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language: language,
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region: region,
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script: script,
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}.each do |key, value|
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next if value.nil?
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regex = self.class.const_get("#{key.upcase}_REGEX")
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raise ParserError, "'#{value}' does not match #{regex}" unless value&.match?(regex)
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instance_variable_set(:"@#{key}", value)
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end
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end
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def include?(other)
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unless other.is_a?(self.class)
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other = self.class.try_parse(other)
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return false if other.nil?
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end
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[:language, :region, :script].all? do |var|
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if other.public_send(var).nil?
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true
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else
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public_send(var) == other.public_send(var)
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end
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end
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end
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def eql?(other)
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unless other.is_a?(self.class)
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other = self.class.try_parse(other)
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return false if other.nil?
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end
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[:language, :region, :script].all? do |var|
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public_send(var) == other.public_send(var)
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end
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end
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alias == eql?
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def detect(locale_groups)
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locale_groups.find { |locales| locales.any? { |locale| eql?(locale) } } ||
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locale_groups.find { |locales| locales.any? { |locale| include?(locale) } }
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end
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sig { returns(String) }
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def to_s
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[@language, @region, @script].compact.join("-")
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end
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end
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