#
# hash_to_qs.rb - by clinton forbes and ryan allen!
#
require 'cgi'

class Hash

  def self.from_qs(str)
    hash = {}
    str.split('&').collect { |k_v| k_v.split('=') }.each do |pair|
      hash[CGI.unescape(pair[0])] = CGI.unescape(pair[1])
    end
    hash
  end

  def to_qs
    collect do |key, value|
      "#{CGI.escape(key.to_s)}=#{CGI.escape(value.to_s)}"
    end.join('&')
  end

end

if __FILE__ == $0

  require 'test/unit'

  class HashToAndFromQSTest < Test::Unit::TestCase

    def setup
      @hash = {'a' => '1', 'b' => '2', 'c' => '3'}
      @qs = 'a=1&b=2&c=3'
    end

    def test_can_convert_hash_to_qs
      assert_equal @qs, @hash.to_qs
    end

    def test_can_convert_qs_to_hash
      assert_equal Hash.from_qs(@qs), @hash
    end

  end

end