Contents

module Squarecoder

  # A Transcoder is a Singleton used to encode and decode strings.
  #
  # Examples
  #
  #   Squarecoder::Transcoder.encode("haveaniceday") # => "hae and via ecy"
  #   Squarecoder::Transcoder.decode("hae and via ecy") # => "haveaniceday"
  #   "haveaniceday".square_encode # => "hae and via ecy"
  #   "hae and via ecy".square_decode # => "haveaniceday"
  class Transcoder

    # Encode a String in square code
    def self.encode a_string, ignore_whitespace = false, ignore_max_length = false
      if !ignore_max_length && a_string.length > MAX_LEN
        raise Squarecoder::InputTooLong
      end
      if !ignore_whitespace && a_string.include?(' ')
        raise Squarecoder::NoWhitespace
      end
      len = (a_string.length ** (0.5)).ceil
      arry = a_string.in_character_arrays_of_length(len)
      if arry.last.length != len
        (len - arry.last.length).times { arry.last << ' ' } # a tiny bit faster than arry.fill
      end
      arry.transpose.collect { |line| line.join }.join(' ').rstrip
    end

    # Decode a String from square code
    def self.decode a_string
      encode(a_string, true, true).gsub(/ +/, '')
    end

  end

end

Version data entries

1 entries across 1 versions & 1 rubygems

Version	Path
squarecoder-0.0.2	lib/squarecoder/transcoder.rb