activesupport/lib/active_support/core_ext/uri.rb


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# frozen_string_literal: true

require "uri"
str = "\xE6\x97\xA5"
parser = URI::Parser.new

needs_monkeypatch =
  begin
    str + str != parser.unescape(str + parser.escape(str).force_encoding(Encoding::UTF_8))
  rescue Encoding::CompatibilityError
    true
  end

if needs_monkeypatch
  require "active_support/core_ext/module/redefine_method"
  URI::Parser.class_eval do
    silence_redefinition_of_method :unescape
    def unescape(str, escaped = /%[a-fA-F\d]{2}/)
      # TODO: Are we actually sure that ASCII == UTF-8?
      # YK: My initial experiments say yes, but let's be sure please
      enc = str.encoding
      enc = Encoding::UTF_8 if enc == Encoding::US_ASCII
      str.dup.force_encoding(Encoding::ASCII_8BIT).gsub(escaped) { |match| [match[1, 2].hex].pack("C") }.force_encoding(enc)
    end
  end
end

module URI
  class << self
    def parser
      @parser ||= URI::Parser.new
    end
  end
end