building DSLs with language workbenches

Transcription

1 ThoughtWorks building DSLs with language workbenches NEAL FORD software architect / meme wrangler ThoughtWorks nford@thoughtworks.com 3003 Summit Boulevard, Atlanta, GA memeagora.blogspot.com

2 ThoughtWorks

3 overview language workbenches building grammars or pseudo-grammars generation templates generation using workbench DSLs

4 language workbenches a tool that supports language oriented programming Intentional Software (Charles Simonyi) Xtext (openarchitectureware) MPS (JetBrains)

5 compilation since cs-101 Parse Compile class Foo { private int id; } Editable Representation Storage Representation Executable Representation

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7 post- ide s first java ide to edit the abstract syntax directly enables refactoring

8 workbenches Versioning Storage class Foo { private int id; } Workbench Projections Document Window Tab Tab Tab Label Menu Editable Label Text Representation Field Storage Representation Label Text Field Text Field Text Field Label Text Field Text Field Text Field Executable Representation

9 grammars

10 Ms. Grant s secret panel

11 the DSL events doorclosed D1CL drawopened D2OP end commands unlockpanel PNUL lockpanel PNLK end

12 the grammar list : eventlist commandlist; eventlist : 'events' eventdec* 'end'; eventdec : identifier identifier; commandlist : 'commands' commanddec* 'end'; commanddec : identifier identifier; events doorclosed D1CL drawopened D2OP end commands unlockpanel PNUL lockpanel PNLK end

13 framework/tool for development of external textual DSLs based on openarchitectureware you provide a grammar in their format Xtext produces: ANTLR grammar, parser, abstract syntax tree meta-model, and Eclipse editor

14 Xtext project

15 Xtext artifacts DSL source generated source meta-data for editor plug-in editor plug-in generators

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17 ANTLR grammar

18 ANTLR grammar...

19 code generation

20 templates

21 template file

22 template

23 main()

24 templates

25 eclipse editor

26 Xtext most mature of the text-based DSL tools still extricating itself from openarchitectureware & MDA background heavily Eclipse based (editors, project structure, etc.) efficient generation of DSL, grammar, code generation, & templates nice editor projection (acts like source file)

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28 bakery life competition is brutal! incentives to encourage repeat customers......but the other guys do the same thing flexible business rules easy to define & change

29 establishing profiles

30 discounts

31 discount

32 discount implementation

33 getdiscount()

34 internal project by JetBrains based on lessons learned with IntelliJ used internally to build new products created by Sergey Dmitriev & Konstantin Solomatov actively used now for 3+ years

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36 new MPS project

37 concepts fundamental building block like a class: data, behavior, encapsulation also editors, code generators implemented in base language properties, events, methods, and links

38 concept declaration

39 concept editor

40 concept editor

41 smart help

42 discount

43 reduction rule mapping

44 reduction template

45 discount template

46 using the editor

47 code generation

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49 grammar? encapsulated within

50 refactoring

51 find usages

52 found usages

53 MPS is written in MPS

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55 composition

56 composing DSLs

57 comparisons Xtext MPS Intentional grammar EBNF/antlr encapsulated? environment Eclipse MPS? code generation projections project ecosystem availability via Eclipse EMF & text via MPS or IntelliJ text-like (for now) internal rich Eclipse MPS? now! open source soon open source? commercial

58 ThoughtWorks questions? please fill out the session evaluations slides & samples available at nealford.com NEAL FORD software architect / meme wrangler ThoughtWorks This work is licensed under the Creative Commons Attribution-Noncommercial-Share Alike 2.5 License. nford@thoughtworks.com 3003 Summit Boulevard, Atlanta, GA memeagora.blogspot.com

59 ThoughtWorks resources Xtext MPS Intentional Softare Martin Fowler s DSL Work in Progress