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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.
#
# $Id$
#++
require 'diff/lcs/change'
class Diff::LCS::SequenceCallbacks #:nodoc:
class << self
def match(event)
event
end
def discard_a(event)
event
end
def discard_b(event)
event
end
end
end
class Diff::LCS::BalancedCallbacks #:nodoc:
class << self
def match(event)
event
end
def discard_a(event)
event
end
def discard_b(event)
event
end
end
end
class Diff::LCS::DiffCallbacks #:nodoc:
attr_accessor :hunk
attr_accessor :diffs
def initialize
@hunk = []
@diffs = []
end
def match(event)
@diffs << @hunk unless @hunk.empty?
@hunk = []
end
def discard_a(event)
@hunk << Diff::LCS::Change.new('-', event.old_ix, event.old_el)
end
def discard_b(event)
@hunk << Diff::LCS::Change.new('+', event.new_ix, event.new_el)
end
end
class Diff::LCS::SDiffCallbacks #:nodoc:
attr_accessor :diffs
def initialize
@diffs = []
end
def match(event)
@diffs << Diff::LCS::Change.new('u', event.old_el, event.new_el)
end
def discard_a(event)
@diffs << Diff::LCS::Change.new('-', event.old_el, nil)
end
def discard_b(event)
@diffs << Diff::LCS::Change.new('+', nil, event.new_el)
end
def change(event)
@diffs << Diff::LCS::Change.new('!', event.old_el, event.new_el)
end
end
class Diff::LCS::YieldingCallbacks #:nodoc:
class << self
def method_missing(symbol, *args)
yield args if block_given?
end
end
end
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