Convert to RSpec

1 files changed, 471 insertions, 471 deletions

diff --git a/lib/diff/lcs.rb b/lib/diff/lcs.rb
index b74b2d3..1013121 100644
--- a/lib/diff/lcs.rb
+++ b/lib/diff/lcs.rb
@@ -1,211 +1,196 @@
-#! /usr/env/bin ruby
-#--
-# Copyright 2004 Austin Ziegler <diff-lcs@halostatue.ca>
-#   adapted from:
-#     Algorithm::Diff (Perl) by Ned Konz <perl@bike-nomad.com>
-#     Smalltalk by Mario I. Wolczko <mario@wolczko.com>
-#   implements McIlroy-Hunt diff algorithm
-#
-# This program is free software. It may be redistributed and/or modified
-# under the terms of the GPL version 2 (or later), the Perl Artistic
-# licence, or the Ruby licence.
-# 
-# $Id$
-#++
+# -*- ruby encoding: utf-8 -*-
 
 module Diff
-    # = Diff::LCS 1.1.2
-    # Computes "intelligent" differences between two sequenced Enumerables.
-    # This is an implementation of the McIlroy-Hunt "diff" algorithm for
-    # Enumerable objects that include Diffable.
-    #
-    # Based on Mario I. Wolczko's <mario@wolczko.com> Smalltalk version
-    # (1.2, 1993) and Ned Konz's <perl@bike-nomad.com> Perl version
-    # (Algorithm::Diff).
-    #
-    # == Synopsis
-    #   require 'diff/lcs'
-    #
-    #   seq1 = %w(a b c e h j l m n p)
-    #   seq2 = %w(b c d e f j k l m r s t)
-    #
-    #   lcs = Diff::LCS.LCS(seq1, seq2)
-    #   diffs = Diff::LCS.diff(seq1, seq2)
-    #   sdiff = Diff::LCS.sdiff(seq1, seq2)
-    #   seq = Diff::LCS.traverse_sequences(seq1, seq2, callback_obj)
-    #   bal = Diff::LCS.traverse_balanced(seq1, seq2, callback_obj)
-    #   seq2 == Diff::LCS.patch(seq1, diffs)
-    #   seq2 == Diff::LCS.patch!(seq1, diffs)
-    #   seq1 == Diff::LCS.unpatch(seq2, diffs)
-    #   seq1 == Diff::LCS.unpatch!(seq2, diffs)
-    #   seq2 == Diff::LCS.patch(seq1, sdiff)
-    #   seq2 == Diff::LCS.patch!(seq1, sdiff)
-    #   seq1 == Diff::LCS.unpatch(seq2, sdiff)
-    #   seq1 == Diff::LCS.unpatch!(seq2, sdiff)
-    #
-    # Alternatively, objects can be extended with Diff::LCS:
-    #
-    #   seq1.extend(Diff::LCS)
-    #   lcs = seq1.lcs(seq2)
-    #   diffs = seq1.diff(seq2)
-    #   sdiff = seq1.sdiff(seq2)
-    #   seq = seq1.traverse_sequences(seq2, callback_obj)
-    #   bal = seq1.traverse_balanced(seq2, callback_obj)
-    #   seq2 == seq1.patch(diffs)
-    #   seq2 == seq1.patch!(diffs)
-    #   seq1 == seq2.unpatch(diffs)
-    #   seq1 == seq2.unpatch!(diffs)
-    #   seq2 == seq1.patch(sdiff)
-    #   seq2 == seq1.patch!(sdiff)
-    #   seq1 == seq2.unpatch(sdiff)
-    #   seq1 == seq2.unpatch!(sdiff)
-    # 
-    # Default extensions are provided for Array and String objects through
-    # the use of 'diff/lcs/array' and 'diff/lcs/string'.
-    #
-    # == Introduction (by Mark-Jason Dominus)
-    # 
-    # <em>The following text is from the Perl documentation. The only
-    # changes have been to make the text appear better in Rdoc</em>.
-    #
-    # I once read an article written by the authors of +diff+; they said
-    # that they hard worked very hard on the algorithm until they found the
-    # right one.
-    #
-    # I think what they ended up using (and I hope someone will correct me,
-    # because I am not very confident about this) was the `longest common
-    # subsequence' method. In the LCS problem, you have two sequences of
-    # items:
-    #
-    #    a b c d f g h j q z
-    #    a b c d e f g i j k r x y z
-    #
-    # and you want to find the longest sequence of items that is present in
-    # both original sequences in the same order. That is, you want to find a
-    # new sequence *S* which can be obtained from the first sequence by
-    # deleting some items, and from the second sequence by deleting other
-    # items. You also want *S* to be as long as possible. In this case *S*
-    # is:
-    # 
-    #    a b c d f g j z
-    #
-    # From there it's only a small step to get diff-like output:
-    #
-    #    e   h i   k   q r x y
-    #    +   - +   +   - + + +
-    #
-    # This module solves the LCS problem. It also includes a canned function
-    # to generate +diff+-like output.
-    #
-    # It might seem from the example above that the LCS of two sequences is
-    # always pretty obvious, but that's not always the case, especially when
-    # the two sequences have many repeated elements. For example, consider
-    #
-    #    a x b y c z p d q
-    #    a b c a x b y c z
-    #
-    # A naive approach might start by matching up the +a+ and +b+ that
-    # appear at the beginning of each sequence, like this:
-    # 
-    #    a x b y c         z p d q
-    #    a   b   c a b y c z
-    #
-    # This finds the common subsequence +a b c z+. But actually, the LCS is
-    # +a x b y c z+:
-    #
-    #          a x b y c z p d q
-    #    a b c a x b y c z
-    #
-    # == Author
-    # This version is by Austin Ziegler <diff-lcs@halostatue.ca>.
-    #
-    # It is based on the Perl Algorithm::Diff by Ned Konz
-    # <perl@bike-nomad.com>, copyright &copy; 2000 - 2002 and the Smalltalk
-    # diff version by Mario I. Wolczko <mario@wolczko.com>, copyright &copy;
-    # 1993. Documentation includes work by Mark-Jason Dominus.
-    #
-    # == Licence
-    # Copyright &copy; 2004 Austin Ziegler
-    # This program is free software; you can redistribute it and/or modify it
-    # under the same terms as Ruby, or alternatively under the Perl Artistic
-    # licence.
-    #
-    # == Credits
-    # Much of the documentation is taken directly from the Perl
-    # Algorithm::Diff implementation and was written originally by Mark-Jason
-    # Dominus <mjd-perl-diff@plover.com> and later by Ned Konz. The basic Ruby
-    # implementation was re-ported from the Smalltalk implementation, available
-    # at ftp://st.cs.uiuc.edu/pub/Smalltalk/MANCHESTER/manchester/4.0/diff.st
-    #
-    # #sdiff and #traverse_balanced were written for the Perl version by Mike
-    # Schilli <m@perlmeister.com>.
-    #
-    # "The algorithm is described in <em>A Fast Algorithm for Computing Longest
-    # Common Subsequences</em>, CACM, vol.20, no.5, pp.350-353, May 1977, with
-    # a few minor improvements to improve the speed."
+  # = Diff::LCS 1.1.3
+  # Computes "intelligent" differences between two sequenced Enumerables.
+  # This is an implementation of the McIlroy-Hunt "diff" algorithm for
+  # Enumerable objects that include Diffable.
+  #
+  # Based on Mario I. Wolczko's Smalltalk version (1.2, 1993) and Ned Konz's
+  # Perl version (Algorithm::Diff 1.15).
+  #
+  # == Synopsis
+  #   require 'diff/lcs'
+  #
+  #   seq1 = %w(a b c e h j l m n p)
+  #   seq2 = %w(b c d e f j k l m r s t)
+  #
+  #   lcs = Diff::LCS.LCS(seq1, seq2)
+  #   diffs = Diff::LCS.diff(seq1, seq2)
+  #   sdiff = Diff::LCS.sdiff(seq1, seq2)
+  #   seq = Diff::LCS.traverse_sequences(seq1, seq2, callback_obj)
+  #   bal = Diff::LCS.traverse_balanced(seq1, seq2, callback_obj)
+  #   seq2 == Diff::LCS.patch(seq1, diffs)
+  #   seq2 == Diff::LCS.patch!(seq1, diffs)
+  #   seq1 == Diff::LCS.unpatch(seq2, diffs)
+  #   seq1 == Diff::LCS.unpatch!(seq2, diffs)
+  #   seq2 == Diff::LCS.patch(seq1, sdiff)
+  #   seq2 == Diff::LCS.patch!(seq1, sdiff)
+  #   seq1 == Diff::LCS.unpatch(seq2, sdiff)
+  #   seq1 == Diff::LCS.unpatch!(seq2, sdiff)
+  #
+  # Alternatively, objects can be extended with Diff::LCS:
+  #
+  #   seq1.extend(Diff::LCS)
+  #   lcs = seq1.lcs(seq2)
+  #   diffs = seq1.diff(seq2)
+  #   sdiff = seq1.sdiff(seq2)
+  #   seq = seq1.traverse_sequences(seq2, callback_obj)
+  #   bal = seq1.traverse_balanced(seq2, callback_obj)
+  #   seq2 == seq1.patch(diffs)
+  #   seq2 == seq1.patch!(diffs)
+  #   seq1 == seq2.unpatch(diffs)
+  #   seq1 == seq2.unpatch!(diffs)
+  #   seq2 == seq1.patch(sdiff)
+  #   seq2 == seq1.patch!(sdiff)
+  #   seq1 == seq2.unpatch(sdiff)
+  #   seq1 == seq2.unpatch!(sdiff)
+  # 
+  # Default extensions are provided for Array and String objects through the
+  # use of 'diff/lcs/array' and 'diff/lcs/string'.
+  #
+  # == Introduction (by Mark-Jason Dominus)
+  # 
+  # <em>The following text is from the Perl documentation. The only changes
+  # have been to make the text appear better in Rdoc</em>.
+  #
+  # I once read an article written by the authors of +diff+; they said that
+  # they hard worked very hard on the algorithm until they found the right
+  # one.
+  #
+  # I think what they ended up using (and I hope someone will correct me,
+  # because I am not very confident about this) was the `longest common
+  # subsequence' method. In the LCS problem, you have two sequences of
+  # items:
+  #
+  #    a b c d f g h j q z
+  #    a b c d e f g i j k r x y z
+  #
+  # and you want to find the longest sequence of items that is present in
+  # both original sequences in the same order. That is, you want to find a
+  # new sequence *S* which can be obtained from the first sequence by
+  # deleting some items, and from the second sequence by deleting other
+  # items. You also want *S* to be as long as possible. In this case *S* is:
+  # 
+  #    a b c d f g j z
+  #
+  # From there it's only a small step to get diff-like output:
+  #
+  #    e   h i   k   q r x y
+  #    +   - +   +   - + + +
+  #
+  # This module solves the LCS problem. It also includes a canned function
+  # to generate +diff+-like output.
+  #
+  # It might seem from the example above that the LCS of two sequences is
+  # always pretty obvious, but that's not always the case, especially when
+  # the two sequences have many repeated elements. For example, consider
+  #
+  #    a x b y c z p d q
+  #    a b c a x b y c z
+  #
+  # A naive approach might start by matching up the +a+ and +b+ that appear
+  # at the beginning of each sequence, like this:
+  # 
+  #    a x b y c         z p d q
+  #    a   b   c a b y c z
+  #
+  # This finds the common subsequence +a b c z+. But actually, the LCS is
+  # +a x b y c z+:
+  #
+  #          a x b y c z p d q
+  #    a b c a x b y c z
+  #
+  # == Author
+  # This version is by Austin Ziegler <austin@rubyforge.org>.
+  #
+  # It is based on the Perl Algorithm::Diff (1.15) by Ned Konz , copyright
+  # &copy; 2000&ndash;2002 and the Smalltalk diff version by Mario I.
+  # Wolczko, copyright &copy; 1993. Documentation includes work by
+  # Mark-Jason Dominus.
+  #
+  # == Licence
+  # Copyright &copy; 2004 Austin Ziegler
+  # This program is free software; you can redistribute it and/or modify it
+  # under the same terms as Ruby, or alternatively under the Perl Artistic
+  # licence.
+  #
+  # == Credits
+  # Much of the documentation is taken directly from the Perl
+  # Algorithm::Diff implementation and was written originally by Mark-Jason
+  # Dominus and later by Ned Konz. The basic Ruby implementation was
+  # re-ported from the Smalltalk implementation, available at
+  # ftp://st.cs.uiuc.edu/pub/Smalltalk/MANCHESTER/manchester/4.0/diff.st
+  #
+  # #sdiff and #traverse_balanced were written for the Perl version by Mike
+  # Schilli <m@perlmeister.com>.
+  #
+  # "The algorithm is described in <em>A Fast Algorithm for Computing
+  # Longest Common Subsequences</em>, CACM, vol.20, no.5, pp.350-353, May
+  # 1977, with a few minor improvements to improve the speed."
   module LCS
-    VERSION = '1.1.2'
+    VERSION = '1.1.3'
   end
 end
 
 require 'diff/lcs/callbacks'
 
 module Diff::LCS
-    # Returns an Array containing the longest common subsequence(s) between
-    # +self+ and +other+. See Diff::LCS#LCS.
-    #
-    #   lcs = seq1.lcs(seq2)
+  # Returns an Array containing the longest common subsequence(s) between
+  # +self+ and +other+. See Diff::LCS#LCS.
+  #
+  #   lcs = seq1.lcs(seq2)
   def lcs(other, &block) #:yields self[ii] if there are matched subsequences:
     Diff::LCS.LCS(self, other, &block)
   end
 
-    # Returns the difference set between +self+ and +other+. See
-    # Diff::LCS#diff.
+  # Returns the difference set between +self+ and +other+. See
+  # Diff::LCS#diff.
   def diff(other, callbacks = nil, &block)
     Diff::LCS::diff(self, other, callbacks, &block)
   end
 
-    # Returns the balanced ("side-by-side") difference set between +self+ and
-    # +other+. See Diff::LCS#sdiff.
+  # Returns the balanced ("side-by-side") difference set between +self+ and
+  # +other+. See Diff::LCS#sdiff.
   def sdiff(other, callbacks = nil, &block)
     Diff::LCS::sdiff(self, other, callbacks, &block)
   end
 
-    # Traverses the discovered longest common subsequences between +self+ and
-    # +other+. See Diff::LCS#traverse_sequences.
+  # Traverses the discovered longest common subsequences between +self+ and
+  # +other+. See Diff::LCS#traverse_sequences.
   def traverse_sequences(other, callbacks = nil, &block)
-    traverse_sequences(self, other, callbacks || Diff::LCS::YieldingCallbacks,
-                       &block)
+    traverse_sequences(self, other, callbacks ||
+                       Diff::LCS::YieldingCallbacks, &block)
   end
 
-    # Traverses the discovered longest common subsequences between +self+ and
-    # +other+ using the alternate, balanced algorithm. See
-    # Diff::LCS#traverse_balanced.
+  # Traverses the discovered longest common subsequences between +self+ and
+  # +other+ using the alternate, balanced algorithm. See
+  # Diff::LCS#traverse_balanced.
   def traverse_balanced(other, callbacks = nil, &block)
-    traverse_balanced(self, other, callbacks || Diff::LCS::YieldingCallbacks,
-                      &block)
+    traverse_balanced(self, other, callbacks ||
+                      Diff::LCS::YieldingCallbacks, &block)
   end
 
-    # Attempts to patch a copy of +self+ with the provided +patchset+. See
-    # Diff::LCS#patch.
+  # Attempts to patch a copy of +self+ with the provided +patchset+. See
+  # Diff::LCS#patch.
   def patch(patchset)
     Diff::LCS::patch(self.dup, patchset)
   end
 
-    # Attempts to unpatch a copy of +self+ with the provided +patchset+.
-    # See Diff::LCS#patch.
+  # Attempts to unpatch a copy of +self+ with the provided +patchset+. See
+  # Diff::LCS#patch.
   def unpatch(patchset)
     Diff::LCS::unpatch(self.dup, patchset)
   end
 
-    # Attempts to patch +self+ with the provided +patchset+. See
-    # Diff::LCS#patch!. Does no autodiscovery.
+  # Attempts to patch +self+ with the provided +patchset+. See
+  # Diff::LCS#patch!. Does no autodiscovery.
   def patch!(patchset)
     Diff::LCS::patch!(self, patchset)
   end
 
-    # Attempts to unpatch +self+ with the provided +patchset+. See
-    # Diff::LCS#unpatch. Does no autodiscovery.
+  # Attempts to unpatch +self+ with the provided +patchset+. See
+  # Diff::LCS#unpatch. Does no autodiscovery.
   def unpatch!(patchset)
     Diff::LCS::unpatch!(self, patchset)
   end
@@ -213,20 +198,20 @@ end
 
 module Diff::LCS
   class << self
-      # Given two sequenced Enumerables, LCS returns an Array containing their
-      # longest common subsequences.
-      #
-      #   lcs = Diff::LCS.LCS(seq1, seq2)
-      #
-      # This array whose contents is such that:
-      #
-      #   lcs.each_with_index do |ee, ii|
-      #     assert(ee.nil? || (seq1[ii] == seq2[ee]))
-      #   end
-      #
-      # If a block is provided, the matching subsequences will be yielded from
-      # +seq1+ in turn and may be modified before they are placed into the
-      # returned Array of subsequences.
+    # Given two sequenced Enumerables, LCS returns an Array containing their
+    # longest common subsequences.
+    #
+    #   lcs = Diff::LCS.LCS(seq1, seq2)
+    #
+    # This array whose contents is such that:
+    #
+    #   lcs.each_with_index do |ee, ii|
+    #     assert(ee.nil? || (seq1[ii] == seq2[ee]))
+    #   end
+    #
+    # If a block is provided, the matching subsequences will be yielded from
+    # +seq1+ in turn and may be modified before they are placed into the
+    # returned Array of subsequences.
     def LCS(seq1, seq2, &block) #:yields seq1[ii] for each matched:
       matches = Diff::LCS.__lcs(seq1, seq2)
       ret = []
@@ -242,15 +227,15 @@ module Diff::LCS
       ret
     end
 
-      # Diff::LCS.diff computes the smallest set of additions and deletions
-      # necessary to turn the first sequence into the second, and returns a
-      # description of these changes.
-      # 
-      # See Diff::LCS::DiffCallbacks for the default behaviour. An alternate
-      # behaviour may be implemented with Diff::LCS::ContextDiffCallbacks.
-      # If a Class argument is provided for +callbacks+, #diff will attempt
-      # to initialise it. If the +callbacks+ object (possibly initialised)
-      # responds to #finish, it will be called.
+    # Diff::LCS.diff computes the smallest set of additions and deletions
+    # necessary to turn the first sequence into the second, and returns a
+    # description of these changes.
+    # 
+    # See Diff::LCS::DiffCallbacks for the default behaviour. An alternate
+    # behaviour may be implemented with Diff::LCS::ContextDiffCallbacks. If
+    # a Class argument is provided for +callbacks+, #diff will attempt to
+    # initialise it. If the +callbacks+ object (possibly initialised)
+    # responds to #finish, it will be called.
     def diff(seq1, seq2, callbacks = nil, &block) # :yields diff changes:
       callbacks ||= Diff::LCS::DiffCallbacks
       if callbacks.kind_of?(Class)
@@ -263,7 +248,7 @@ module Diff::LCS
       if block_given?
         res = callbacks.diffs.map do |hunk|
           if hunk.kind_of?(Array)
-            hunk = hunk.map { |block| yield block }
+            hunk = hunk.map { |hunk_block| yield hunk_block }
           else
             yield hunk
           end
@@ -274,20 +259,20 @@ module Diff::LCS
       end
     end
 
-      # Diff::LCS.sdiff computes all necessary components to show two sequences
-      # and their minimized differences side by side, just like the Unix
-      # utility <em>sdiff</em> does:
-      #
-      #     old        <     -
-      #     same             same
-      #     before     |     after
-      #     -          >     new
-      #
-      # See Diff::LCS::SDiffCallbacks for the default behaviour. An alternate
-      # behaviour may be implemented with Diff::LCS::ContextDiffCallbacks. If
-      # a Class argument is provided for +callbacks+, #diff will attempt to
-      # initialise it. If the +callbacks+ object (possibly initialised)
-      # responds to #finish, it will be called.
+    # Diff::LCS.sdiff computes all necessary components to show two sequences
+    # and their minimized differences side by side, just like the Unix
+    # utility <em>sdiff</em> does:
+    #
+    #     old        <     -
+    #     same             same
+    #     before     |     after
+    #     -          >     new
+    #
+    # See Diff::LCS::SDiffCallbacks for the default behaviour. An alternate
+    # behaviour may be implemented with Diff::LCS::ContextDiffCallbacks. If
+    # a Class argument is provided for +callbacks+, #diff will attempt to
+    # initialise it. If the +callbacks+ object (possibly initialised)
+    # responds to #finish, it will be called.
     def sdiff(seq1, seq2, callbacks = nil, &block) #:yields diff changes:
       callbacks ||= Diff::LCS::SDiffCallbacks
       if callbacks.kind_of?(Class)
@@ -300,7 +285,7 @@ module Diff::LCS
       if block_given?
         res = callbacks.diffs.map do |hunk|
           if hunk.kind_of?(Array)
-            hunk = hunk.map { |block| yield block }
+            hunk = hunk.map { |hunk_block| yield hunk_block }
           else
             yield hunk
           end
@@ -311,87 +296,88 @@ module Diff::LCS
       end
     end
 
-      # Diff::LCS.traverse_sequences is the most general facility provided by this
-      # module; +diff+ and +LCS+ are implemented as calls to it.
-      #
-      # The arguments to #traverse_sequences are the two sequences to
-      # traverse, and a callback object, like this:
-      #
-      #   traverse_sequences(seq1, seq2, Diff::LCS::ContextDiffCallbacks.new)
-      #
-      # #diff is implemented with #traverse_sequences.
-      #
-      # == Callback Methods
-      # Optional callback methods are <em>emphasized</em>.
-      #
-      # callbacks#match::               Called when +a+ and +b+ are pointing
-      #                                 to common elements in +A+ and +B+.
-      # callbacks#discard_a::           Called when +a+ is pointing to an
-      #                                 element not in +B+.
-      # callbacks#discard_b::           Called when +b+ is pointing to an
-      #                                 element not in +A+.
-      # <em>callbacks#finished_a</em>:: Called when +a+ has reached the end of
-      #                                 sequence +A+.
-      # <em>callbacks#finished_b</em>:: Called when +b+ has reached the end of
-      #                                 sequence +B+.
-      #
-      # == Algorithm
-      #       a---+
-      #           v
-      #       A = a b c e h j l m n p
-      #       B = b c d e f j k l m r s t
-      #           ^
-      #       b---+
-      #
-      # If there are two arrows (+a+ and +b+) pointing to elements of
-      # sequences +A+ and +B+, the arrows will initially point to the first
-      # elements of their respective sequences. #traverse_sequences will
-      # advance the arrows through the sequences one element at a time,
-      # calling a method on the user-specified callback object before each
-      # advance. It will advance the arrows in such a way that if there are
-      # elements <tt>A[ii]</tt> and <tt>B[jj]</tt> which are both equal and
-      # part of the longest common subsequence, there will be some moment
-      # during the execution of #traverse_sequences when arrow +a+ is pointing
-      # to <tt>A[ii]</tt> and arrow +b+ is pointing to <tt>B[jj]</tt>. When
-      # this happens, #traverse_sequences will call <tt>callbacks#match</tt>
-      # and then it will advance both arrows.
-      #
-      # Otherwise, one of the arrows is pointing to an element of its sequence
-      # that is not part of the longest common subsequence.
-      # #traverse_sequences will advance that arrow and will call
-      # <tt>callbacks#discard_a</tt> or <tt>callbacks#discard_b</tt>, depending
-      # on which arrow it advanced. If both arrows point to elements that are
-      # not part of the longest common subsequence, then #traverse_sequences
-      # will advance one of them and call the appropriate callback, but it is
-      # not specified which it will call.
-      #
-      # The methods for <tt>callbacks#match</tt>, <tt>callbacks#discard_a</tt>,
-      # and <tt>callbacks#discard_b</tt> are invoked with an event comprising
-      # the action ("=", "+", or "-", respectively), the indicies +ii+ and
-      # +jj+, and the elements <tt>A[ii]</tt> and <tt>B[jj]</tt>. Return
-      # values are discarded by #traverse_sequences.
-      #
-      # === End of Sequences
-      # If arrow +a+ reaches the end of its sequence before arrow +b+ does,
-      # #traverse_sequence try to call <tt>callbacks#finished_a</tt> with the
-      # last index and element of +A+ (<tt>A[-1]</tt>) and the current index
-      # and element of +B+ (<tt>B[jj]</tt>). If <tt>callbacks#finished_a</tt>
-      # does not exist, then <tt>callbacks#discard_b</tt> will be called on
-      # each element of +B+ until the end of the sequence is reached (the call
-      # will be done with <tt>A[-1]</tt> and <tt>B[jj]</tt> for each element).
-      #
-      # If +b+ reaches the end of +B+ before +a+ reaches the end of +A+,
-      # <tt>callbacks#finished_b</tt> will be called with the current index
-      # and element of +A+ (<tt>A[ii]</tt>) and the last index and element of
-      # +B+ (<tt>A[-1]</tt>). Again, if <tt>callbacks#finished_b</tt> does not
-      # exist on the callback object, then <tt>callbacks#discard_a</tt> will
-      # be called on each element of +A+ until the end of the sequence is
-      # reached (<tt>A[ii]</tt> and <tt>B[-1]</tt>).
-      #
-      # There is a chance that one additional <tt>callbacks#discard_a</tt> or
-      # <tt>callbacks#discard_b</tt> will be called after the end of the
-      # sequence is reached, if +a+ has not yet reached the end of +A+ or +b+
-      # has not yet reached the end of +B+.
+    # Diff::LCS.traverse_sequences is the most general facility provided by this
+    # module; +diff+ and +LCS+ are implemented as calls to it.
+    #
+    # The arguments to #traverse_sequences are the two sequences to
+    # traverse, and a callback object, like this:
+    #
+    #   traverse_sequences(seq1, seq2, Diff::LCS::ContextDiffCallbacks.new)
+    #
+    # #diff is implemented with #traverse_sequences.
+    #
+    # == Callback Methods
+    # Optional callback methods are <em>emphasized</em>.
+    #
+    # callbacks#match::               Called when +a+ and +b+ are pointing
+    #                                 to common elements in +A+ and +B+.
+    # callbacks#discard_a::           Called when +a+ is pointing to an
+    #                                 element not in +B+.
+    # callbacks#discard_b::           Called when +b+ is pointing to an
+    #                                 element not in +A+.
+    # <em>callbacks#finished_a</em>:: Called when +a+ has reached the end of
+    #                                 sequence +A+.
+    # <em>callbacks#finished_b</em>:: Called when +b+ has reached the end of
+    #                                 sequence +B+.
+    #
+    # == Algorithm
+    #       a---+
+    #           v
+    #       A = a b c e h j l m n p
+    #       B = b c d e f j k l m r s t
+    #           ^
+    #       b---+
+    #
+    # If there are two arrows (+a+ and +b+) pointing to elements of
+    # sequences +A+ and +B+, the arrows will initially point to the first
+    # elements of their respective sequences. #traverse_sequences will
+    # advance the arrows through the sequences one element at a time,
+    # calling a method on the user-specified callback object before each
+    # advance. It will advance the arrows in such a way that if there are
+    # elements <tt>A[ii]</tt> and <tt>B[jj]</tt> which are both equal and
+    # part of the longest common subsequence, there will be some moment
+    # during the execution of #traverse_sequences when arrow +a+ is pointing
+    # to <tt>A[ii]</tt> and arrow +b+ is pointing to <tt>B[jj]</tt>. When
+    # this happens, #traverse_sequences will call <tt>callbacks#match</tt>
+    # and then it will advance both arrows.
+    #
+    # Otherwise, one of the arrows is pointing to an element of its sequence
+    # that is not part of the longest common subsequence.
+    # #traverse_sequences will advance that arrow and will call
+    # <tt>callbacks#discard_a</tt> or <tt>callbacks#discard_b</tt>, depending
+    # on which arrow it advanced. If both arrows point to elements that are
+    # not part of the longest common subsequence, then #traverse_sequences
+    # will advance one of them and call the appropriate callback, but it is
+    # not specified which it will call.
+    #
+    # The methods for <tt>callbacks#match</tt>, <tt>callbacks#discard_a</tt>,
+    # and <tt>callbacks#discard_b</tt> are invoked with an event comprising
+    # the action ("=", "+", or "-", respectively), the indicies +ii+ and
+    # +jj+, and the elements <tt>A[ii]</tt> and <tt>B[jj]</tt>. Return
+    # values are discarded by #traverse_sequences.
+    #
+    # === End of Sequences
+    # If arrow +a+ reaches the end of its sequence before arrow +b+ does,
+    # #traverse_sequence will try to call <tt>callbacks#finished_a</tt> with
+    # the last index and element of +A+ (<tt>A[-1]</tt>) and the current
+    # index and element of +B+ (<tt>B[jj]</tt>). If
+    # <tt>callbacks#finished_a</tt> does not exist, then
+    # <tt>callbacks#discard_b</tt> will be called on each element of +B+
+    # until the end of the sequence is reached (the call
+    # will be done with <tt>A[-1]</tt> and <tt>B[jj]</tt> for each element).
+    #
+    # If +b+ reaches the end of +B+ before +a+ reaches the end of +A+,
+    # <tt>callbacks#finished_b</tt> will be called with the current index
+    # and element of +A+ (<tt>A[ii]</tt>) and the last index and element of
+    # +B+ (<tt>A[-1]</tt>). Again, if <tt>callbacks#finished_b</tt> does not
+    # exist on the callback object, then <tt>callbacks#discard_a</tt> will
+    # be called on each element of +A+ until the end of the sequence is
+    # reached (<tt>A[ii]</tt> and <tt>B[-1]</tt>).
+    #
+    # There is a chance that one additional <tt>callbacks#discard_a</tt> or
+    # <tt>callbacks#discard_b</tt> will be called after the end of the
+    # sequence is reached, if +a+ has not yet reached the end of +A+ or +b+
+    # has not yet reached the end of +B+.
     def traverse_sequences(seq1, seq2, callbacks = Diff::LCS::SequenceCallbacks, &block) #:yields change events:
       matches = Diff::LCS.__lcs(seq1, seq2)
 
@@ -433,10 +419,10 @@ module Diff::LCS
       end
       ai += 1
 
-        # The last entry (if any) processed was a match. +ai+ and +bj+ point
-        # just past the last matching lines in their sequences.
+      # The last entry (if any) processed was a match. +ai+ and +bj+ point
+      # just past the last matching lines in their sequences.
       while (ai < a_size) or (bj < b_size)
-          # last A?
+        # last A?
         if ai == a_size and bj < b_size
           if callbacks.respond_to?(:finished_a) and not run_finished_a
             ax = string ? seq1[-1, 1] : seq1[-1]
@@ -458,7 +444,7 @@ module Diff::LCS
           end
         end
 
-          # last B?
+        # last B?
         if bj == b_size and ai < a_size
           if callbacks.respond_to?(:finished_b) and not run_finished_b
             ax = string ? seq1[ai, 1] : seq1[ai]
@@ -500,88 +486,88 @@ module Diff::LCS
       end
     end
 
-      # #traverse_balanced is an alternative to #traverse_sequences. It
-      # uses a different algorithm to iterate through the entries in the
-      # computed longest common subsequence. Instead of viewing the changes as
-      # insertions or deletions from one of the sequences, #traverse_balanced
-      # will report <em>changes</em> between the sequences. To represent a
-      #
-      # The arguments to #traverse_balanced are the two sequences to traverse
-      # and a callback object, like this:
-      #
-      #   traverse_balanced(seq1, seq2, Diff::LCS::ContextDiffCallbacks.new)
-      #
-      # #sdiff is implemented with #traverse_balanced.
-      #
-      # == Callback Methods
-      # Optional callback methods are <em>emphasized</em>.
-      #
-      # callbacks#match::               Called when +a+ and +b+ are pointing
-      #                                 to common elements in +A+ and +B+.
-      # callbacks#discard_a::           Called when +a+ is pointing to an
-      #                                 element not in +B+.
-      # callbacks#discard_b::           Called when +b+ is pointing to an
-      #                                 element not in +A+.
-      # <em>callbacks#change</em>::     Called when +a+ and +b+ are pointing
-      #                                 to the same relative position, but
-      #                                 <tt>A[a]</tt> and <tt>B[b]</tt> are
-      #                                 not the same; a <em>change</em> has
-      #                                 occurred.
-      #
-      # #traverse_balanced might be a bit slower than #traverse_sequences,
-      # noticable only while processing huge amounts of data.
-      #
-      # The +sdiff+ function of this module is implemented as call to
-      # #traverse_balanced.
-      #
-      # == Algorithm
-      #       a---+
-      #           v
-      #       A = a b c e h j l m n p
-      #       B = b c d e f j k l m r s t
-      #           ^
-      #       b---+
-      #
-      # === Matches
-      # If there are two arrows (+a+ and +b+) pointing to elements of
-      # sequences +A+ and +B+, the arrows will initially point to the first
-      # elements of their respective sequences. #traverse_sequences will
-      # advance the arrows through the sequences one element at a time,
-      # calling a method on the user-specified callback object before each
-      # advance. It will advance the arrows in such a way that if there are
-      # elements <tt>A[ii]</tt> and <tt>B[jj]</tt> which are both equal and
-      # part of the longest common subsequence, there will be some moment
-      # during the execution of #traverse_sequences when arrow +a+ is pointing
-      # to <tt>A[ii]</tt> and arrow +b+ is pointing to <tt>B[jj]</tt>. When
-      # this happens, #traverse_sequences will call <tt>callbacks#match</tt>
-      # and then it will advance both arrows.
-      #
-      # === Discards
-      # Otherwise, one of the arrows is pointing to an element of its sequence
-      # that is not part of the longest common subsequence.
-      # #traverse_sequences will advance that arrow and will call
-      # <tt>callbacks#discard_a</tt> or <tt>callbacks#discard_b</tt>,
-      # depending on which arrow it advanced.
-      #
-      # === Changes
-      # If both +a+ and +b+ point to elements that are not part of the longest
-      # common subsequence, then #traverse_sequences will try to call
-      # <tt>callbacks#change</tt> and advance both arrows. If
-      # <tt>callbacks#change</tt> is not implemented, then
-      # <tt>callbacks#discard_a</tt> and <tt>callbacks#discard_b</tt> will be
-      # called in turn.
-      #
-      # The methods for <tt>callbacks#match</tt>, <tt>callbacks#discard_a</tt>,
-      # <tt>callbacks#discard_b</tt>, and <tt>callbacks#change</tt> are
-      # invoked with an event comprising the action ("=", "+", "-", or "!",
-      # respectively), the indicies +ii+ and +jj+, and the elements
-      # <tt>A[ii]</tt> and <tt>B[jj]</tt>. Return values are discarded by
-      # #traverse_balanced.
-      #
-      # === Context
-      # Note that +ii+ and +jj+ may not be the same index position, even if
-      # +a+ and +b+ are considered to be pointing to matching or changed
-      # elements.
+    # #traverse_balanced is an alternative to #traverse_sequences. It
+    # uses a different algorithm to iterate through the entries in the
+    # computed longest common subsequence. Instead of viewing the changes as
+    # insertions or deletions from one of the sequences, #traverse_balanced
+    # will report <em>changes</em> between the sequences. To represent a
+    #
+    # The arguments to #traverse_balanced are the two sequences to traverse
+    # and a callback object, like this:
+    #
+    #   traverse_balanced(seq1, seq2, Diff::LCS::ContextDiffCallbacks.new)
+    #
+    # #sdiff is implemented with #traverse_balanced.
+    #
+    # == Callback Methods
+    # Optional callback methods are <em>emphasized</em>.
+    #
+    # callbacks#match::               Called when +a+ and +b+ are pointing
+    #                                 to common elements in +A+ and +B+.
+    # callbacks#discard_a::           Called when +a+ is pointing to an
+    #                                 element not in +B+.
+    # callbacks#discard_b::           Called when +b+ is pointing to an
+    #                                 element not in +A+.
+    # <em>callbacks#change</em>::     Called when +a+ and +b+ are pointing
+    #                                 to the same relative position, but
+    #                                 <tt>A[a]</tt> and <tt>B[b]</tt> are
+    #                                 not the same; a <em>change</em> has
+    #                                 occurred.
+    #
+    # #traverse_balanced might be a bit slower than #traverse_sequences,
+    # noticable only while processing huge amounts of data.
+    #
+    # The +sdiff+ function of this module is implemented as call to
+    # #traverse_balanced.
+    #
+    # == Algorithm
+    #       a---+
+    #           v
+    #       A = a b c e h j l m n p
+    #       B = b c d e f j k l m r s t
+    #           ^
+    #       b---+
+    #
+    # === Matches
+    # If there are two arrows (+a+ and +b+) pointing to elements of
+    # sequences +A+ and +B+, the arrows will initially point to the first
+    # elements of their respective sequences. #traverse_sequences will
+    # advance the arrows through the sequences one element at a time,
+    # calling a method on the user-specified callback object before each
+    # advance. It will advance the arrows in such a way that if there are
+    # elements <tt>A[ii]</tt> and <tt>B[jj]</tt> which are both equal and
+    # part of the longest common subsequence, there will be some moment
+    # during the execution of #traverse_sequences when arrow +a+ is pointing
+    # to <tt>A[ii]</tt> and arrow +b+ is pointing to <tt>B[jj]</tt>. When
+    # this happens, #traverse_sequences will call <tt>callbacks#match</tt>
+    # and then it will advance both arrows.
+    #
+    # === Discards
+    # Otherwise, one of the arrows is pointing to an element of its sequence
+    # that is not part of the longest common subsequence.
+    # #traverse_sequences will advance that arrow and will call
+    # <tt>callbacks#discard_a</tt> or <tt>callbacks#discard_b</tt>,
+    # depending on which arrow it advanced.
+    #
+    # === Changes
+    # If both +a+ and +b+ point to elements that are not part of the longest
+    # common subsequence, then #traverse_sequences will try to call
+    # <tt>callbacks#change</tt> and advance both arrows. If
+    # <tt>callbacks#change</tt> is not implemented, then
+    # <tt>callbacks#discard_a</tt> and <tt>callbacks#discard_b</tt> will be
+    # called in turn.
+    #
+    # The methods for <tt>callbacks#match</tt>, <tt>callbacks#discard_a</tt>,
+    # <tt>callbacks#discard_b</tt>, and <tt>callbacks#change</tt> are
+    # invoked with an event comprising the action ("=", "+", "-", or "!",
+    # respectively), the indicies +ii+ and +jj+, and the elements
+    # <tt>A[ii]</tt> and <tt>B[jj]</tt>. Return values are discarded by
+    # #traverse_balanced.
+    #
+    # === Context
+    # Note that +ii+ and +jj+ may not be the same index position, even if
+    # +a+ and +b+ are considered to be pointing to matching or changed
+    # elements.
     def traverse_balanced(seq1, seq2, callbacks = Diff::LCS::BalancedCallbacks)
       matches = Diff::LCS.__lcs(seq1, seq2)
       a_size = seq1.size
@@ -690,10 +676,10 @@ module Diff::LCS
       :unpatch => { '+' => '-', '-' => '+', '!' => '!', '=' => '=' }
     }
 
-      # Given a patchset, convert the current version to the new
-      # version. If +direction+ is not specified (must be
-      # <tt>:patch</tt> or <tt>:unpatch</tt>), then discovery of the
-      # direction of the patch will be attempted.
+    # Given a patchset, convert the current version to the new
+    # version. If +direction+ is not specified (must be
+    # <tt>:patch</tt> or <tt>:unpatch</tt>), then discovery of the
+    # direction of the patch will be attempted.
     def patch(src, patchset, direction = nil)
       string = src.kind_of?(String)
         # Start with a new empty type of the source's class
@@ -793,51 +779,54 @@ module Diff::LCS
       res
     end
 
-      # Given a set of patchset, convert the current version to the prior
-      # version. Does no auto-discovery.
+    # Given a set of patchset, convert the current version to the prior
+    # version. Does no auto-discovery.
     def unpatch!(src, patchset)
       Diff::LCS.patch(src, patchset, :unpatch)
     end
 
-      # Given a set of patchset, convert the current version to the next
-      # version. Does no auto-discovery.
+    # Given a set of patchset, convert the current version to the next
+    # version. Does no auto-discovery.
     def patch!(src, patchset)
       Diff::LCS.patch(src, patchset, :patch)
     end
 
 # private
-      # Compute the longest common subsequence between the sequenced Enumerables
-      # +a+ and +b+. The result is an array whose contents is such that
-      #
-      #     result = Diff::LCS.__lcs(a, b)
-      #     result.each_with_index do |e, ii|
-      #       assert_equal(a[ii], b[e]) unless e.nil?
-      #     end
+    # Compute the longest common subsequence between the sequenced
+    # Enumerables +a+ and +b+. The result is an array whose contents is such
+    # that
+    #
+    #     result = Diff::LCS.__lcs(a, b)
+    #     result.each_with_index do |e, ii|
+    #       assert_equal(a[ii], b[e]) unless e.nil?
+    #     end
+    #
+    # Note: This will be deprecated as a public function in a future release.
     def __lcs(a, b)
       a_start = b_start = 0
       a_finish = a.size - 1
       b_finish = b.size - 1
       vector = []
 
-        # Prune off any common elements at the beginning...
+      # Prune off any common elements at the beginning...
       while (a_start <= a_finish) and
-            (b_start <= b_finish) and
-            (a[a_start] == b[b_start])
+        (b_start <= b_finish) and
+        (a[a_start] == b[b_start])
         vector[a_start] = b_start
         a_start += 1
         b_start += 1
       end
 
-        # Now the end...
+      # Now the end...
       while (a_start <= a_finish) and
-            (b_start <= b_finish) and
-            (a[a_finish] == b[b_finish])
+        (b_start <= b_finish) and
+        (a[a_finish] == b[b_finish])
         vector[a_finish] = b_finish
         a_finish -= 1
         b_finish -= 1
       end
 
-        # Now, compute the equivalence classes of positions of elements.
+      # Now, compute the equivalence classes of positions of elements.
       b_matches = Diff::LCS.__position_hash(b, b_start .. b_finish)
 
       thresh = []
@@ -868,14 +857,16 @@ module Diff::LCS
       vector
     end
 
-      # Find the place at which +value+ would normally be inserted into the
-      # Enumerable. If that place is already occupied by +value+, do nothing
-      # and return +nil+. If the place does not exist (i.e., it is off the end
-      # of the Enumerable), add it to the end. Otherwise, replace the element
-      # at that point with +value+. It is assumed that the Enumerable's values
-      # are numeric.
-      #
-      # This operation preserves the sort order.
+    # Find the place at which +value+ would normally be inserted into the
+    # Enumerable. If that place is already occupied by +value+, do nothing
+    # and return +nil+. If the place does not exist (i.e., it is off the end
+    # of the Enumerable), add it to the end. Otherwise, replace the element
+    # at that point with +value+. It is assumed that the Enumerable's values
+    # are numeric.
+    #
+    # This operation preserves the sort order.
+    #
+    # Note: This will be deprecated as a public function in a future release.
     def __replace_next_larger(enum, value, last_index = nil)
         # Off the end?
       if enum.empty? or (value > enum[-1])
@@ -906,9 +897,11 @@ module Diff::LCS
       return first_index
     end
 
-      # If +vector+ maps the matching elements of another collection onto this
-      # Enumerable, compute the inverse +vector+ that maps this Enumerable
-      # onto the collection. (Currently unused.)
+    # If +vector+ maps the matching elements of another collection onto this
+    # Enumerable, compute the inverse +vector+ that maps this Enumerable
+    # onto the collection. (Currently unused.)
+    #
+    # Note: This will be deprecated as a public function in a future release.
     def __inverse_vector(a, vector)
       inverse = a.dup
       (0 ... vector.size).each do |ii|
@@ -917,9 +910,11 @@ module Diff::LCS
       inverse
     end
 
-      # Returns a hash mapping each element of an Enumerable to the set of
-      # positions it occupies in the Enumerable, optionally restricted to the
-      # elements specified in the range of indexes specified by +interval+.
+    # Returns a hash mapping each element of an Enumerable to the set of
+    # positions it occupies in the Enumerable, optionally restricted to the
+    # elements specified in the range of indexes specified by +interval+.
+    #
+    # Note: This will be deprecated as a public function in a future release.
     def __position_hash(enum, interval = 0 .. -1)
       hash = Hash.new { |hh, kk| hh[kk] = [] }
       interval.each do |ii|
@@ -929,13 +924,15 @@ module Diff::LCS
       hash
     end
 
-      # Examine the patchset and the source to see in which direction the
-      # patch should be applied.
-      #
-      # WARNING: By default, this examines the whole patch, so this could take
-      # some time. This also works better with Diff::LCS::ContextChange or
-      # Diff::LCS::Change as its source, as an array will cause the creation
-      # of one of the above.
+    # Examine the patchset and the source to see in which direction the
+    # patch should be applied.
+    #
+    # WARNING: By default, this examines the whole patch, so this could take
+    # some time. This also works better with Diff::LCS::ContextChange or
+    # Diff::LCS::Change as its source, as an array will cause the creation
+    # of one of the above.
+    #
+    # Note: This will be deprecated as a public function in a future release.
     def __diff_direction(src, patchset, limit = nil)
       count = left = left_miss = right = right_miss = 0
       string = src.kind_of?(String)
@@ -945,9 +942,9 @@ module Diff::LCS
 
         case change
         when Diff::LCS::Change
-            # With a simplistic change, we can't tell the difference between
-            # the left and right on '!' actions, so we ignore those. On '='
-            # actions, if there's a miss, we miss both left and right.
+          # With a simplistic change, we can't tell the difference between
+          # the left and right on '!' actions, so we ignore those. On '='
+          # actions, if there's a miss, we miss both left and right.
           element = string ? src[change.position, 1] : src[change.position]
 
           case change.action
@@ -1007,7 +1004,7 @@ module Diff::LCS
           end
         end
 
-        break if not limit.nil? and count > limit
+        break if (not limit.nil?) && (count > limit)
       end
 
       no_left = (left == 0) and (left_miss >= 0)
@@ -1023,55 +1020,56 @@ module Diff::LCS
       end
     end
 
-      # Normalize the patchset. A patchset is always a sequence of changes, but
-      # how those changes are represented may vary, depending on how they were
-      # generated. In all cases we support, we also support the array
-      # representation of the changes. The formats are:
-      #
-      #   [ # patchset <- Diff::LCS.diff(a, b)
-      #     [ # one or more hunks
-      #       Diff::LCS::Change # one or more changes
-      #     ] ]
-      #
-      #   [ # patchset, equivalent to the above
-      #     [ # one or more hunks
-      #       [ action, line, value ] # one or more changes
-      #     ] ]
-      #
-      #   [ # patchset <- Diff::LCS.diff(a, b, Diff::LCS::ContextDiffCallbacks)
-      #     #       OR <- Diff::LCS.sdiff(a, b, Diff::LCS::ContextDiffCallbacks)
-      #     [ # one or more hunks
-      #       Diff::LCS::ContextChange # one or more changes
-      #     ] ]
-      #
-      #   [ # patchset, equivalent to the above
-      #     [ # one or more hunks
-      #       [ action, [ old line, old value ], [ new line, new value ] ]
-      #         # one or more changes
-      #     ] ]
-      #
-      #   [ # patchset <- Diff::LCS.sdiff(a, b)
-      #     #       OR <- Diff::LCS.diff(a, b, Diff::LCS::SDiffCallbacks)
-      #     Diff::LCS::ContextChange # one or more changes
-      #   ]
-      #
-      #   [ # patchset, equivalent to the above
-      #     [ action, [ old line, old value ], [ new line, new value ] ]
-      #       # one or more changes
-      #   ]
-      #
-      # The result of this will be either of the following.
-      #
-      #   [ # patchset
-      #     Diff::LCS::ContextChange # one or more changes
-      #   ]
-      #
-      #   [ # patchset
-      #     Diff::LCS::Change # one or more changes
-      #   ]
-      #
-      # If either of the above is provided, it will be returned as such.
-      #
+    # Normalize the patchset. A patchset is always a sequence of changes, but
+    # how those changes are represented may vary, depending on how they were
+    # generated. In all cases we support, we also support the array
+    # representation of the changes. The formats are:
+    #
+    #   [ # patchset <- Diff::LCS.diff(a, b)
+    #     [ # one or more hunks
+    #       Diff::LCS::Change # one or more changes
+    #     ] ]
+    #
+    #   [ # patchset, equivalent to the above
+    #     [ # one or more hunks
+    #       [ action, line, value ] # one or more changes
+    #     ] ]
+    #
+    #   [ # patchset <- Diff::LCS.diff(a, b, Diff::LCS::ContextDiffCallbacks)
+    #     #       OR <- Diff::LCS.sdiff(a, b, Diff::LCS::ContextDiffCallbacks)
+    #     [ # one or more hunks
+    #       Diff::LCS::ContextChange # one or more changes
+    #     ] ]
+    #
+    #   [ # patchset, equivalent to the above
+    #     [ # one or more hunks
+    #       [ action, [ old line, old value ], [ new line, new value ] ]
+    #         # one or more changes
+    #     ] ]
+    #
+    #   [ # patchset <- Diff::LCS.sdiff(a, b)
+    #     #       OR <- Diff::LCS.diff(a, b, Diff::LCS::SDiffCallbacks)
+    #     Diff::LCS::ContextChange # one or more changes
+    #   ]
+    #
+    #   [ # patchset, equivalent to the above
+    #     [ action, [ old line, old value ], [ new line, new value ] ]
+    #       # one or more changes
+    #   ]
+    #
+    # The result of this will be either of the following.
+    #
+    #   [ # patchset
+    #     Diff::LCS::ContextChange # one or more changes
+    #   ]
+    #
+    #   [ # patchset
+    #     Diff::LCS::Change # one or more changes
+    #   ]
+    #
+    # If either of the above is provided, it will be returned as such.
+    #
+    # Note: This will be deprecated as a public function in a future release.
     def __normalize_patchset(patchset)
       patchset.map do |hunk|
         case hunk
@@ -1103,3 +1101,5 @@ module Diff::LCS
     end
   end
 end
+
+# vim: ft=ruby