Algorithm::Diff3::Diff3 - diff3 plugin

NAME

Algorithm::Diff3::Diff3 - diff3 plugin

SYNOPSYS

  use Algorithm::Diff3;
  my $f = Algorithm::Diff3::Factory->new;
  my $mytext   = $f->create_text([ map{chomp;$_} <F0> ]);
  my $original = $f->create_text([ map{chomp;$_} <F1> ]);
  my $yourtext = $f->create_text([ map{chomp;$_} <F2> ]);
  my $p = $f->create_diff3;
  my $diff3 = $p->diff3( $mytext, $origial, $yourtext );

ABSTRACT

This is a plugin to compute differnce sets between three text buffers ported from GNU diff3.c written by Randy Smith.

DESCRIPTION

Please see how to use this plugin through a factory in a Algorithm::Diff3 document.

WORK WITH diff

diff3 processor needs to support of a two way diff plugin module. There are two requirements for a diff plugin module.

First, it must independ upon the policy of line numbers in text buffers. Not only line numbers may start zero normally Perl's array, but also it start one diff(1) command output. In this module, any line number scheme is hidden in the capsul of text buffer class.

Second, it must adapt line number parameters in a delete range and an append one due to the numbers of lines treatments in diff3 processor. For instanse, diff plugin modifies the ranges in a same scheme of line number started from 1 such as diff(1) command as follows.

  diff(1) to modified; # original   changed text
  1c1 to 1,1c1,1; # [ qw( a b ) ]   [ qw( A b ) ]
  0a1 to 1,0a1,1; # [ qw( a b ) ]   [ qw( A a b ) ]
  1a2 to 2,1a2,2; # [ qw( a b ) ]   [ qw( a B b ) ]
  2a3 to 3,2a3,3; # [ qw( a b ) ]   [ qw( a b C ) ]
  1d0 to 1,1d1,0; # [ qw( A b c ) ] [ qw( b c ) ]
  2d1 to 2,2d2,1; # [ qw( a B c ) ] [ qw( a c ) ]
  3d2 to 3,3d3,2; # [ qw( a b C ) ] [ qw( a b ) ]

In change case at first one, do not happen modification. In append cases from second to 4th one, increment low line number for the original text side. In delete cases from 5th to 7th one, increment low line number for the modified text side.

Their line numbers are normally droped in the diff(1) command. So that you do their modifications simply adding success value from the output one if you make a plugin diff(1) command invoker.

SEE ALSO

GNU/diffutils/2.7/diff3.c

   Three way file comparison program (diff3) for Project GNU.
   Copyright (C) 1988, 1989, 1992, 1993, 1994 Free Software Foundation, Inc.
   Written by Randy Smith

Algorithm::Diff3

AUTHOR

MIZUTANI Tociyuki <tociyuki@gmail.com>

COPYRIGHT AND LICENSE

Copyright (C) 2005 MIZUTANI Tociyuki

This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2, or (at your option) any later version.

 Algorithm::Diff3::Diff3 - diff3 plugin