# File lib/rspec/expectations/differ.rb, line 48 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
This is snagged from diff/lcs/ldiff.rb (which is a commandline tool)
# 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) 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 << 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
# File lib/rspec/expectations/differ.rb, line 78 def blue(text) color(text, 34) end
# File lib/rspec/expectations/differ.rb, line 66 def color(text, color_code) "\e[#{color_code}m#{text}\e[0m" end
# File lib/rspec/expectations/differ.rb, line 82 def color_diff(diff) return diff unless RSpec::Matchers.configuration.color? diff.lines.map { |line| case line[0].chr when "+" green line when "-" red line when "@" line[1].chr == "@" ? blue(line) : line else line end }.join end
# File lib/rspec/expectations/differ.rb, line 62 def context_lines 3 end
# File lib/rspec/expectations/differ.rb, line 58 def format :unified end
# File lib/rspec/expectations/differ.rb, line 74 def green(text) color(text, 32) end
# File lib/rspec/expectations/differ.rb, line 99 def object_to_string(object) case object when Hash object.keys.sort_by { |k| k.to_s }.map do |k| %Q(#{PP.singleline_pp(k, "")} => #{PP.singleline_pp(object[k], "")}) end.join(",\n") when String object =~ /\n/ ? object : object.inspect else PP.pp(object,"") end end
# File lib/rspec/expectations/differ.rb, line 70 def red(text) color(text, 31) end