Class Spec::Expectations::Differs::Default

  1. lib/spec/expectations/differs/default.rb
Parent: Object

TODO add some rdoc

Methods

public class

  1. new

public instance

  1. diff_as_object
  2. diff_as_string

protected instance

  1. context_lines
  2. format

Public class methods

new (options)
[show source] 
# File lib/spec/expectations/differs/default.rb, line 14
        def initialize(options)
          @options = options
        end

Public instance methods

diff_as_object (target,expected)
[show source] 
# File lib/spec/expectations/differs/default.rb, line 50
        def diff_as_object(target,expected)
          diff_as_string(PP.pp(target,""), PP.pp(expected,""))
        end
diff_as_string (data_new, data_old)

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

[show source] 
# File lib/spec/expectations/differs/default.rb, line 19
        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

Protected instance methods

context_lines ()
[show source] 
# File lib/spec/expectations/differs/default.rb, line 59
        def context_lines
          @options.context_lines
        end
format ()
[show source] 
# File lib/spec/expectations/differs/default.rb, line 55
        def format
          @options.diff_format
        end