"

 Copyright (c) 2007-2012 Tony Garnock-Jones

 This code is based on Squeak's DiffMerge package

 written by Tony Garnock-Jones. Original project's web site:

 http://www.squeaksource.com/DiffMerge

 Permission is hereby granted, free of charge, to any person

 obtaining a copy of this software and associated documentation

 files (the 'Software'), to deal in the Software without

 restriction, including without limitation the rights to use,

 copy, modify, merge, publish, distribute, sublicense, and/or sell

 copies of the Software, and to permit persons to whom the

 Software is furnished to do so, subject to the following

 conditions:

 The above copyright notice and this permission notice shall be

 included in all copies or substantial portions of the Software.

 THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND,

 EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES

 OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND

 NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT

 HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,

 WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING

 FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR

 OTHER DEALINGS IN THE SOFTWARE.

"

"{ Package: 'stx:libtool' }"

Diff3InclusiveVisitor subclass:#Diff3ExclusiveVisitor

	instanceVariableNames:''

	classVariableNames:''

	poolDictionaries:''

	category:'Collections-Sequenceable-Diff'

!

Diff3ExclusiveVisitor comment:'A Diff3ExclusiveVisitor is used by Diff3 to construct a three-way SequenceableCollection merge that resolves "false conflicts" (a.k.a "accidental clean merges") by accepting the changed text as a non-conflict in the merge result.

-- 

Copyright (c) 2008 Tony Garnock-Jones <tonyg@lshift.net>

Copyright (c) 2008 LShift Ltd. <query@lshift.net>

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction,including without limitation the rights to use, copy, modify, merge,publish, distribute, sublicense, and/or sell copies of the Software,and to permit persons to whom the Software is furnished to do so,subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

'

!

!Diff3ExclusiveVisitor class methodsFor:'documentation'!

copyright

"

 Copyright (c) 2007-2012 Tony Garnock-Jones

 This code is based on Squeak's DiffMerge package

 written by Tony Garnock-Jones. Original project's web site:

 http://www.squeaksource.com/DiffMerge

 Permission is hereby granted, free of charge, to any person

 obtaining a copy of this software and associated documentation

 files (the 'Software'), to deal in the Software without

 restriction, including without limitation the rights to use,

 copy, modify, merge, publish, distribute, sublicense, and/or sell

 copies of the Software, and to permit persons to whom the

 Software is furnished to do so, subject to the following

 conditions:

 The above copyright notice and this permission notice shall be

 included in all copies or substantial portions of the Software.

 THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND,

 EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES

 OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND

 NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT

 HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,

 WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING

 FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR

 OTHER DEALINGS IN THE SOFTWARE.

"

!

documentation

"

    A Diff3ExclusiveVisitor is used by Diff3 to construct a three-way SequenceableCollection 

    merge that resolves 'false conflicts' (a.k.a 'accidental clean merges') by accepting the 

    changed text as a non-conflict in the merge result.

    [author:]

        Tony Garnock-Jones <tonyg@lshift.com>

    [instance variables:]

    [class variables:]

    [see also:]

"

! !

!Diff3ExclusiveVisitor methodsFor:'as yet unclassified'!

isTrueConflictBetween: left and: right

	"A conflict is 'false' when, from a particular ancestral snippet, both the left and right branches have changed to have the same contents. In some circumstances this can be treated as a clean merge; in others, it's actually an exception that needs to be dealt with. See http://revctrl.org/AccidentalCleanMerge."

	left length = right length ifFalse: [^true].

	(left extractFrom: (files at: #left)) = (right extractFrom: (files at: #right)) ifFalse: [^true].

	^false

!

left: left original: original right: right

	(self isTrueConflictBetween: left and: right)

		ifTrue: [super left: left original: original right: right]

		ifFalse: [self side: #left chunk: left]

! !

!Diff3ExclusiveVisitor class methodsFor:'documentation'!

version

    ^ '$Header: /cvs/stx/stx/libtool/Diff3ExclusiveVisitor.st,v 1.2 2014-02-25 07:00:15 cg Exp $'

!

version_CVS

    ^ '$Header: /cvs/stx/stx/libtool/Diff3ExclusiveVisitor.st,v 1.2 2014-02-25 07:00:15 cg Exp $'

! !