1 files changed, 68 insertions, 0 deletions
diff --git a/Library/Homebrew/locale.rb b/Library/Homebrew/locale.rb
new file mode 100644
index 000000000..1aff33dae
--- /dev/null
+++ b/Library/Homebrew/locale.rb
@@ -0,0 +1,68 @@
+class Locale
+  class ParserError < ::RuntimeError
+  end
+
+  LANGUAGE_REGEX = /(?:[a-z]{2})/
+  REGION_REGEX = /(?:[A-Z]{2})/
+  SCRIPT_REGEX = /(?:[A-Z][a-z]{3})/
+
+  LOCALE_REGEX = /^(#{LANGUAGE_REGEX})?(?:(?:^|-)(#{REGION_REGEX}))?(?:(?:^|-)(#{SCRIPT_REGEX}))?$/
+
+  def self.parse(string)
+    language, region, script = string.to_s.scan(LOCALE_REGEX)[0]
+
+    if language.nil? && region.nil? && script.nil?
+      raise ParserError, "'#{string}' cannot be parsed to a #{self.class}"
+    end
+
+    new(language, region, script)
+  end
+
+  attr_reader :language, :region, :script
+
+  def initialize(language, region, script)
+    if language.nil? && region.nil? && script.nil?
+      raise ArgumentError, "#{self.class} cannot be empty"
+    end
+
+    {
+      language: language,
+      region:   region,
+      script:   script,
+    }.each do |key, value|
+      next if value.nil?
+
+      regex = self.class.const_get("#{key.upcase}_REGEX")
+      raise ParserError, "'#{value}' does not match #{regex}" unless value =~ regex
+      instance_variable_set(:"@#{key}", value)
+    end
+
+    self
+  end
+
+  def include?(other)
+    other = self.class.parse(other) unless other.is_a?(self.class)
+
+    [:language, :region, :script].all? { |var|
+      if other.public_send(var).nil?
+        true
+      else
+        public_send(var) == other.public_send(var)
+      end
+    }
+  end
+
+  def eql?(other)
+    other = self.class.parse(other) unless other.is_a?(self.class)
+    [:language, :region, :script].all? { |var|
+      public_send(var) == other.public_send(var)
+    }
+  rescue ParserError
+    false
+  end
+  alias == eql?
+
+  def to_s
+    [@language, @region, @script].compact.join("-")
+  end
+end