Method: External::Io#sort_compare

Defined in:
lib/external/io.rb

#sort_compare(another, blksize = default_blksize) ⇒ Object

Sort compare (ie <=>) with another IO, behaving like a comparison between the full string contents of self and another. This obviously can be a long operation if it requires the full read of two large IO objects.



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# File 'lib/external/io.rb', line 129

def sort_compare(another, blksize=default_blksize)
  # equal in comparison if the ios are equal
  return 0 if quick_compare(another)
  
  self.flush
  self.reset_length
  
  another.flush
  another.reset_length
  
  if another.length > self.length
    return -1
  elsif self.length < another.length
    return 1
  else
    self.pos = 0
    another.pos = 0

    sa = sb = nil
    while sa == sb
      sa = self.read(blksize)
      sb = another.read(blksize)
      break if sa.nil? || sb.nil?
    end

    sa.to_s <=> sb.to_s
  end
end