Class: RSpec::Expectations::Differ

Inherits:
Object
  • Object
show all
Defined in:
lib/rspec/expectations/differ.rb

Instance Method Summary collapse

Instance Method Details

#diff_as_object(actual, expected) ⇒ Object 



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# File 'lib/rspec/expectations/differ.rb', line 42

def diff_as_object(actual, expected)
  actual_as_string = object_to_string(actual)
  expected_as_string = object_to_string(expected)
  diff = diff_as_string(actual_as_string, expected_as_string)

  if diff.empty?
    "#{actual}.==(#{expected}) returned false even though the diff " \
    "between #{actual} and #{expected} is empty. Check the " \
    "implementation of #{actual}.==."
  else
    color_diff diff
  end
end

#diff_as_string(data_new, data_old) ⇒ Object

This is snagged from diff/lcs/ldiff.rb (which is a commandline tool)



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# File 'lib/rspec/expectations/differ.rb', line 9

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 }
  diffs = Diff::LCS.diff(data_old, data_new)
  output = ""
  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"
  color_diff output
end