81 lines
2.0 KiB
Ruby
81 lines
2.0 KiB
Ruby
class Locale
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class ParserError < StandardError
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end
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LANGUAGE_REGEX = /(?:[a-z]{2,3})/ # ISO 639-1 or ISO 639-2
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REGION_REGEX = /(?:[A-Z]{2}|\d{3})/ # ISO 3166-1 or UN M.49
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SCRIPT_REGEX = /(?:[A-Z][a-z]{3})/ # ISO 15924
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LOCALE_REGEX = /\A((?:#{LANGUAGE_REGEX}|#{REGION_REGEX}|#{SCRIPT_REGEX})(?:\-|$)){1,3}\Z/
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def self.parse(string)
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string = string.to_s
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if string !~ LOCALE_REGEX
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raise ParserError, "'#{string}' cannot be parsed to a #{self}"
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end
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scan = proc do |regex|
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string.scan(/(?:\-|^)(#{regex})(?:\-|$)/).flatten.first
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end
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language = scan.call(LANGUAGE_REGEX)
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region = scan.call(REGION_REGEX)
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script = scan.call(SCRIPT_REGEX)
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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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if language.nil? && region.nil? && script.nil?
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raise ArgumentError, "#{self.class} cannot be empty"
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end
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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 =~ 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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other = self.class.parse(other) unless other.is_a?(self.class)
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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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other = self.class.parse(other) unless other.is_a?(self.class)
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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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rescue ParserError
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false
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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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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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