Class: RSpec::Expectations::Differ

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

Instance Method Summary (collapse)

Instance Method Details

- (Object) diff_as_object(actual, expected)



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# File 'lib/rspec/expectations/differ.rb', line 58

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

- (Object) diff_as_string(input_data_new, input_data_old)

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



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# File 'lib/rspec/expectations/differ.rb', line 10

def diff_as_string(input_data_new, input_data_old)
  encoding = pick_encoding input_data_new, input_data_old
  output = matching_encoding("", encoding)
  data_old = input_data_old.split(matching_encoding("\n", encoding)).map! { |e| e.chomp }
  data_new = input_data_new.split(matching_encoding("\n", encoding)).map! { |e| e.chomp }
  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)
        if hunk.respond_to?(:merge)
          # diff-lcs 1.2.x
          hunk.merge(oldhunk)
        else
          # diff-lcs 1.1.3
          hunk.unshift(oldhunk)
        end
      else
        output << matching_encoding(oldhunk.diff(format).to_s, encoding)
      end
    ensure
      oldhunk = hunk
      output << matching_encoding("\n", encoding)
    end
  end
  #Handle the last remaining hunk
  output << matching_encoding(oldhunk.diff(format).to_s, encoding)
  output << matching_encoding("\n", encoding)
  color_diff output
rescue Encoding::CompatibilityError
  if input_data_new.encoding != input_data_old.encoding
    "Could not produce a diff because the encoding of the actual string (#{input_data_old.encoding}) "+
    "differs from the encoding of the expected string (#{input_data_new.encoding})"
  else
    "Could not produce a diff because of the encoding of the string (#{input_data_old.encoding})"
  end
end

- (Object) matching_encoding(string, encoding)



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# File 'lib/rspec/expectations/differ.rb', line 137

def matching_encoding(string, encoding)
  string.encode encoding
rescue Encoding::UndefinedConversionError
  string.encode(encoding, :undef => :replace)
end

- (Object) pick_encoding(source_a, source_b)



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# File 'lib/rspec/expectations/differ.rb', line 133

def pick_encoding(source_a, source_b)
  Encoding.compatible?(source_a, source_b) || Encoding.default_external
end