DSLs Internas e Ruby

DSLs Internas e Ruby @fabiokung

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

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

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

DSLs externas

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

o problema...

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

hora de codar

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

hora de codar

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

DSLs Internas e Ruby

by Fabio Kung on Oct 13, 2009

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