require 'mpressen_palindrome/version'

module MpressenPalindrome
  class Error < StandardError; end

  # Returns true for a palindrome, false otherwise.
  def palindrome?
    return false if processed_content.nil? || processed_content.empty?

    processed_content == processed_content.reverse
  end

  private

  # Returns content for palindrome testing.
  def processed_content
    to_s.scan(/[a-z\d]/i).join.downcase.strip
  end
end

class String
  include MpressenPalindrome
end

class Integer
  include MpressenPalindrome
end