Module: Nuggets::String::XorMixin

Included in:
String
Defined in:
lib/nuggets/string/xor_mixin.rb

Instance Method Summary collapse

Instance Method Details

#xor(other, require_same_length = false) ⇒ Object Also known as: ^

call-seq:

str ^ other => new_string
str.xor(other) => new_string

Bitwise EXCLUSIVE OR.



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# File 'lib/nuggets/string/xor_mixin.rb', line 38

def xor(other, require_same_length = false)
  format = 'B*'
  binary = [self, other.to_s].map { |s| s.unpack(format).first }

  length = binary.map { |s| s.length }.inject { |a, b|
    if require_same_length
      a == b ? a : raise(::ArgumentError, 'must be of same length')
    else
      [a, b].max
    end
  }

  [binary.map { |s| s.to_i(2) }.
          inject { |a, b| a ^ b }.
          to_binary_s(length)].pack(format)
end