Domain Specific Languages - A superficial approach

DSL - Domain Specific Languages

quinta-feira, 12 de dezembro de 13

@toni_esteves

* Software Craftsman

* Web Developer TRE-AL

* Graduando Sistemas de Informação


Domain...


* Identify concepts related to system requirements...

* It is an artifact that represents the domain of problem...

* Should be independent of the physical solution...

* Communication...

* Visual representation of conceptual classes or objects real world...

* UML...


DSL...


“DSLs are small languages, focused on a particular aspect of a software

system. You can't build a full program with a DSL, but you often use multiple DSLs in a system mainly written in a general purpose language....” - Matin Fowler


WTF ?!

“DSLs are small languages, focused on a particular aspect of a software

system. You can't build a full program with a DSL, but you often use multiple DSLs in a system mainly written in a general purpose language....” - Matin Fowler


A real aplication....


If you’ll design a device driver, which

programming language do you choose ?!


Try this then, if you will build a compiler which programming language

you choose ?!


X


X

General Purpose Languages

Domain Specific Languages


Communication Protocol Device Drives Games Databases

Image Manipulations MusicMobile Agents Medical





subroutine libraries/ API`s Component Framework / Object-Orientation


For example...

=SOMA(D1:D5)

Do you know this ?!


“ DSLs are very common in computing: e x a m p l e s i n c l u d e C S S , r e g u l a r expressions, make, rake, ant, SQL, HQL, many bits of Rails, expectations in JMock, graphviz's dot language, FIT, strut's configuration file....” - Matin Fowler


GUI builders can also be seen as DSLs?


Characteristics....* Are usually small...

* Are usually declarative...

* Many DSLs are translated compiled) into calls to APIs...

* Are divided into External DSL and Internal DSL...

* Unambiguous...


Pattern Application....Model: It`s the problem. May be a te xtual e xpre ss ion or a diagram...

Plataform: Used for the execution of the problem...

Integration: method to express the integration of language on the platform...


Pattern Application....


Method of Integration...Reading: part of the platform i tse l f i s de dicate d to the mastery of expressions of dsl and execution of your goals...

G e n e r a t i o n : a s e p a r a t e procedure is used to convert the DSL expression into something t h at re c o gn ize s p l at f or m natively...


Method of Integration...

Craft Techniques: used when a particular model is not enough to solve the entire problem...


DSL types...


External...* Independent of a particular programming language...

* Depends on the programming language...

* It`s benefited by existing resources in the host language...

* It`s limited by the rules of the host language restrictions...

* May be readable to people who do not know anything about the language, but have experience in the field...


Internal...* Usually are easy to implement...

* Creator of the language has the freedom to create the language the way you want...

* Is necessary to create a compiler for parsing, processing syntax and mapping semantics...

* Very flexible but takes time to create and maintain the compiler...


Advantages...* Solutions in their own language and domain...

* Increase abstraction level...

* What programming instead how programming...

* Efforts on productivity...

* Encapsulates the problem...

* Prepare code to reuse...

* Make concise code...

* Generate sufficient documentation...quinta-feira, 12 de dezembro de 13

Drawback...* Requires attention to high costs...

* Needs technical expertise on domain...

* Needs to bring all the relevant domain knowledge...

* Difficulty in seeking the general scope and the construction of domain-specific languages...

* Experts must possess the relevant knowledge domain...


Other topics...

* Embedded DSL...

* Language Workbench...

* Visual DSL`s...

* Language-Oriented Programming...


Ending....


References....http://www.martinfowler.com/articles/languageWorkbench.html

http://www.infoq.com/presentations/domain-specific-languages

http://blog.caelum.com.br/domain-specific-languages-em-acao/

http://martinfowler.com/books/dsl.html

http://martinfowler.com/bliki/DomainSpecificLanguage.html

http://blogs.msdn.com/b/wcamb/archive/2009/08/17/algumas-palavrinhas-sobre-domain-specific-language-dsl.aspx

http://www.infoq.com/presentations/Truth-about-DSL

http://www.cesar.edu.br/docs/DSL%20CESAR.pdf


http://www.martinfowler.com/articles/languageWorkbench.html

http://www.martinfowler.com/articles/languageWorkbench.html

















Domain Specific Languages - A superficial approach

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