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Dr. Vadim Zaytsev, SWAT, CWI 2013

Pending Evolutionof Grammars

XM2013: Second Extreme Modelling Workshop

http://grammarware.net/
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http://www.cwi.nl/research-groups/Software-Analysis-and-Transformation
http://www.cwi.nl/research-groups/Software-Analysis-and-Transformation
http://www.cwi.nl/
http://www.cwi.nl/

Why the problem is a problem

! Grammar evolution

is (meta)model transformation

! MDE doesn’t work

! All MDE tools are crap

! Model transformation bores people

! We need more agility! [citation needed] ! also XM keynote by Jon Whittle

Consider it done!

http://cheezburger.com/6125443584

http://cheezburger.com/6125443584
http://cheezburger.com/6125443584

Grammar evolution

G G G G G

Grammar evolution

G G G G G

unfold

Composable default fragments

Composable default fragments

G G G G G

defineN

defineNdefineN

Composable default fragments

G G G G G

defineN

defineNdefineN

= =

Composable default fragments

G G G G G

defineN

= =

two defineN failed

Asserting preconditions

Asserting preconditions

G G G G G

vertical

deyaccify

verticaldeyaccify

Asserting preconditions

G G G G G

vertical

deyaccify

verticaldeyaccify

=

Asserting preconditions

G G G G G

deyaccify

verticaldeyaccify

=

all Ok

Bulk processing

Bulk processing

G G G G G

inject

defineNreplace

deyaccify

Bulk processing

G G G G G

fix

fixfix

fix

Bulk processing

G G G G G

fix

fixfix

fix

report

=

=

Bulk processing

G G G G G

fix

fixfix

fix

report

=

Bulk processing

G G G G G

fix

fixfix

fix

report

Pending failure

Pending failure

G G G G G

introduce

narrowunite

renameN

Pending failure

G G G G G

introduce

narrowunite

renameN

Pending failure

G G G G G

introduce

narrowunite

renameN

report

Pending failure

G G G G G

introduce

narrowunite

renameN

report

negotiations help!cf. XM2012/JOT

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Persistent normalisation

Persistent normalisation

G G G G G

introduce

factordefine

addV

Persistent normalisation

G G G G G

introduce

factordefine

addV

:-(

Persistent normalisation

G G G G G

introduce

factordefine

addV

horizontal :-)horizontalhorizontal

Pre-export normalisation

Pre-export normalisation

G G G G G

change

changechange

change

G G

Pre-export normalisation

G G G G G

change

changechange

change

G Gnormalisenormalise

Also diff:

G G G G G

change

changechange

change

G Gnormalisenormalise

differ

To summarise

http://commons.wikimedia.org/wiki/File:Torii_kiyoshige_bando_hikosaburo_ii.jpg

! Don’t do

! Consider it done

! Accumulate failures

! Plan beforehand

! Execute optionally

! ???

! PROFIT!

http://commons.wikimedia.org/wiki/File:Torii_kiyoshige_bando_hikosaburo_ii.jpg
http://commons.wikimedia.org/wiki/File:Torii_kiyoshige_bando_hikosaburo_ii.jpg

Tutorial on Tuesday(1 October 2013, 8:30)

vadim@grammarware.net

mailto:vadim@grammarware.net?subject=IPA
mailto:vadim@grammarware.net?subject=IPA
http://grammarware.net
http://grammarware.net

Pending Evolution of Grammars

Vadim Zaytsev

Software Analysis & Transformation Team,Centrum Wiskunde & Informatica,

Amsterdam, The Netherlands

Abstract. The classic approach to grammar manipulation is based oninstant processing of grammar edits, which limits the kinds of grammarevolution scenarios that can be expressed with it. Treating transforma-tion preconditions as guards poses limitations on concurrent changes ofthe same grammar, on reuse of evolution scripts, on expressing option-ally executed steps, on batch processing and optimization of them, etc.We propose an alternative paradigm of evolution, where a transforma-tion can be scheduled for later execution based on its precondition. Thiskind of extreme evolution can be useful for expressing scenarios that areimpossible to fully automate within the classic or the negotiated trans-formation paradigms.

1 Introduction

A colloquial expression ‘consider it done’ means that the subject of the conver-sation is either indeed already done, or will be done in the very near future —in either case, the receiver of such a message can rest assured that the subjectwill take place if it has not already, and is expected to act as if it has indeedhappened. The technique of pending evolution that we introduce in this paper,is similar to that expression, and the benefits of it are not unlike the subtledifferences between considering something done and it having been done.

As it turns out, the pending evolution scheme allows us to efficiently modelscenarios of grammar evolution, deployment and maintenance that are impossi-ble to model within the traditional grammar transformation paradigm, which isbriefly explained in §2. The method is introduced in §3. Since the most profitshide deep in the details, we spend the rest of the paper (§4) by motivating theuse of pending evolution for grammars instead of classical evolution scripts, byconcrete examples. §5 concludes the paper by summarizing its contributions anddiscussing related work.

2 GrammarLab

GrammarLab is a codename for a grammar manipulation project that is cur-rently being migrated from the Software Language Processing Suite1 initiative

1 V. Zaytsev, R. Lammel, T. van der Storm, L. Renggli, G. Wachsmuth. SoftwareLanguage Processing Suite, 2008–2013. http://slps.github.io.

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