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Viewing changes to vendor/gems/rspec/lib/spec/expectations/differs/default.rb

  • Committer: Bazaar Package Importer
  • Author(s): Micah Anderson
  • Date: 2008-07-26 15:43:45 UTC
  • mfrom: (1.1.8 upstream) (3.1.1 lenny)
  • Revision ID: james.westby@ubuntu.com-20080726154345-c03m49twzxewdwjn
Tags: 0.24.5-2
* Fix puppetlast to work with 0.24.5
* Adjust logcheck to match against new log messages in 0.24.5
* Update standards version to 3.8.0 (no changes)
* Update changelog to reduce length of line to make lintian happy

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vendor/gems/rspec/lib/spec/expectations/differs/default.rb
 
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begin
 
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  require 'rubygems'
 
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  require 'diff/lcs' #necessary due to loading bug on some machines - not sure why - DaC
 
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  require 'diff/lcs/hunk'
 
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rescue LoadError ; raise "You must gem install diff-lcs to use diffing" ; end
 
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require 'pp'
 
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module Spec
 
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  module Expectations
 
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    module Differs
 
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      # TODO add some rdoc
 
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      class Default
 
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        def initialize(options)
 
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          @options = options
 
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        end
 
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        # This is snagged from diff/lcs/ldiff.rb (which is a commandline tool)
 
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        def diff_as_string(data_old, data_new)
 
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          data_old = data_old.split(/\n/).map! { |e| e.chomp }
 
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          data_new = data_new.split(/\n/).map! { |e| e.chomp }
 
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          output = ""
 
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          diffs = Diff::LCS.diff(data_old, data_new)
 
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          return output if diffs.empty?
 
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          oldhunk = hunk = nil  
 
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          file_length_difference = 0
 
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          diffs.each do |piece|
 
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            begin
 
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              hunk = Diff::LCS::Hunk.new(data_old, data_new, piece, context_lines,
 
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                                         file_length_difference)
 
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              file_length_difference = hunk.file_length_difference      
 
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              next unless oldhunk      
 
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              # Hunks may overlap, which is why we need to be careful when our
 
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              # diff includes lines of context. Otherwise, we might print
 
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              # redundant lines.
 
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              if (context_lines > 0) and hunk.overlaps?(oldhunk)
 
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                hunk.unshift(oldhunk)
 
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              else
 
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                output << oldhunk.diff(format)
 
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              end
 
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            ensure
 
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              oldhunk = hunk
 
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              output << "\n"
 
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            end
 
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          end  
 
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          #Handle the last remaining hunk
 
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          output << oldhunk.diff(format) << "\n"
 
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        end  
 
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        def diff_as_object(target,expected)
 
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          diff_as_string(PP.pp(target,""), PP.pp(expected,""))
 
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        end
 
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        protected
 
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        def format
 
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          @options.diff_format
 
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        end
 
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        def context_lines
 
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          @options.context_lines
 
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        end
 
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      end
 
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    end
 
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  end
 
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end