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#! /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.
#
# $Id$
#++
class Diff::LCS::Change
attr_reader :action, :position, :text
include Comparable
def ==(other)
(self.action == other.action) and
(self.position == other.position) and
(self.text == other.text)
end
def <=>(other)
r = self.action <=> other.action
r = self.position <=> other.position if r.zero?
r = self.text <=> other.text if r.zero?
r
end
def initialize(action, position, text)
@action = action
@position = position
@text = text
end
def to_a
[@action, @position, @text]
end
def self.from_a(*arr)
Diff::LCS::Change.new(arr[0], arr[1], arr[2])
end
def deleting?
@action == :-
end
def adding?
@action == :+
end
def unchanged?
@action == :u
end
def changed?
@changed == :c
end
end
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