class Spec::Expectations::Differs::Default

def context_lines
  @options.context_lines
end

def diff_as_object(target,expected)
  diff_as_string(PP.pp(target,""), PP.pp(expected,""))
end

def diff_as_string(data_new, data_old)
  data_old = data_old.split(/\n/).map! { |e| e.chomp }
  data_new = data_new.split(/\n/).map! { |e| e.chomp }
  output = ""
  diffs = Diff::LCS.diff(data_old, data_new)
  return output if diffs.empty?
  oldhunk = hunk = nil  
  file_length_difference = 0
  diffs.each do |piece|
    begin
      hunk = Diff::LCS::Hunk.new(data_old, data_new, piece, context_lines,
                                 file_length_difference)
      file_length_difference = hunk.file_length_difference      
      next unless oldhunk      
      # Hunks may overlap, which is why we need to be careful when our
      # diff includes lines of context. Otherwise, we might print
      # redundant lines.
      if (context_lines > 0) and hunk.overlaps?(oldhunk)
        hunk.unshift(oldhunk)
      else
        output << oldhunk.diff(format)
      end
    ensure
      oldhunk = hunk
      output << "\n"
    end
  end  
  #Handle the last remaining hunk
  output << oldhunk.diff(format) << "\n"
end  

def format
  @options.diff_format
end

def initialize(options)
  @options = options
end