DSLs Internas e Ruby

Oct 13, 20091 like718 views

The document discusses domain-specific languages (DSLs) and provides examples of internal and external DSLs. It mentions using DSLs to define date operations and search queries. Code snippets demonstrate building DSLs in Ruby and Scala, including using automata and semantic models. The document advises always using a semantic model and provides tips on metaprogramming techniques in Ruby like method_missing and class_eval. It concludes by thanking the reader and providing contact information.

DSL?
http://www.ﬂickr.com/photos/pragdave/173640462/

DSLs internas

hoje().mais(uns(2).meses());

Date.today + 2.months
4.weeks.ago

DSLs internas

var d1 = Hoje mais 2 meses
var d2 = Amanhã menos 1 mês e mais 10 anos e mais 1 dia
Scala: http://gist.github.com/207718 (by Sergio Lopes)

Date.today + 2.months
4.weeks.ago

DSLs internas

Feature: Search courses
In order to ensure better utilization of courses
Potential students should be able to search for courses

Scenario: Search by topic
Given there are 240 courses without topic "biology"
And there are 2 courses A001, B205 with topic "biology"
When I search for "biology"
Then I should see the following courses:
| Course code |
| A001 |
| B205 |

DSLs externas

http://www.ﬂickr.com/photos/stephenvandyke/96983232/

http://www.ﬂickr.com/photos/hand-nor-glove/438290969/

2.maneiras

http://www.ﬂickr.com/photos/aussiegall/759309122/

Top-Down

http://www.ﬂickr.com/photos/akiraikari/2657579326/

Bottom-Up

(define cdar-sequence?
(automaton init
[init : (c -> more)]

[more : (a -> more)
(d -> more)
(r -> end)]

[end : accept]))

http://martinfowler.com/dslwip/SemanticModel.html

Semantic Model

http://martinfowler.com/dslwip/SemanticModel.html

My advice is
to always use a
Semantic

Semantic Model

$Resumo • Module.included(klass) • obj.extend(Module) • Class.class_eval { ... } • obj.send(method) • obj.instance_eval { ... }$

E mais...

• method_missing(name, *args)
• Class.inherited(subclass)
• lambdas, Proc
• ...

Dúvidas?

Obrigado!

fabio.kung @ [gmail locaweb]
http://twitter.com/fabiokung

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DSLs Internas e Ruby

1. DSLs Internas e Ruby @fabiokung

3. DSL? http://www.ﬂickr.com/photos/pragdave/173640462/

5. DSLs internas hoje().mais(meses(2));

6. DSLs internas hoje().mais(uns(2).meses());

7. Date.today + 2.months 4.weeks.ago DSLs internas

8. var d1 = Hoje mais 2 meses var d2 = Amanhã menos 1 mês e mais 10 anos e mais 1 dia Scala: http://gist.github.com/207718 (by Sergio Lopes) Date.today + 2.months 4.weeks.ago DSLs internas

9. DSLs externas

10. Feature: Search courses In order to ensure better utilization of courses Potential students should be able to search for courses Scenario: Search by topic Given there are 240 courses without topic "biology" And there are 2 courses A001, B205 with topic "biology" When I search for "biology" Then I should see the following courses: | Course code | | A001 | | B205 | DSLs externas

13. o problema...

14. http://www.ﬂickr.com/photos/stephenvandyke/96983232/

15. http://www.ﬂickr.com/photos/hand-nor-glove/438290969/ 2.maneiras

16. http://www.ﬂickr.com/photos/aussiegall/759309122/ Top-Down

17. http://www.ﬂickr.com/photos/akiraikari/2657579326/ Bottom-Up

18. hora de codar

19. (define cdar-sequence? (automaton init [init : (c -> more)] [more : (a -> more) (d -> more) (r -> end)] [end : accept]))

20. hora de codar

21. http://martinfowler.com/dslwip/SemanticModel.html Semantic Model

22. http://martinfowler.com/dslwip/SemanticModel.html My advice is to always use a Semantic Semantic Model

23. Resumo • Module.included(klass) • obj.extend(Module) • Class.class_eval { ... } • obj.send(method) • obj.instance_eval { ... }

24. E mais... • method_missing(name, *args) • Class.inherited(subclass) • lambdas, Proc • ...

25. Dúvidas? Obrigado! fabio.kung @ [gmail locaweb] http://twitter.com/fabiokung

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