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DSL‘s

DSL‘s. Daniel Frey. Roadmap. Introduction Definitions Pros/Cons Samples. Introduction. Sample My way of experiencing DSL‘s Focus on language oriented DSL’s. Introduction / 2 . Why do we need DSL‘s?. Definitions. DSL

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DSL‘s

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  1. DSL‘s Daniel Frey

  2. Roadmap • Introduction • Definitions • Pros/Cons • Samples

  3. Introduction • Sample • My way of experiencing DSL‘s • Focus on language oriented DSL’s

  4. Introduction / 2 • Why do we need DSL‘s?

  5. Definitions • DSL • A computer programming language of limited expressiveness focused on a particular domain

  6. Definition / 2 • computer programming language • language nature • limited expressiveness • domain focus

  7. Styles of DSL‘s • Internal • External • Language Workbenches

  8. Language Workbench

  9. Sample Input File: #123456789012345678901234567890123456789012345678901234567890 SVCLFOWLER 10101MS0120050313......................... SVCLHOHPE 10201DX0320050315........................ SVCLTWO x10301MRP220050329........................... USGE10301TWO x50214..7050329.......................

  10. DSL 1 <?xml version="1.0" encoding="utf-8" ?> <ReaderConfiguration> <Mapping Code = "SVCL" TargetClass = "dsl.ServiceCall"> <Field name = "CustomerName" start = "4" end = "18"/> <Field name = "CustomerID" start = "19" end = "23"/> <Field name = "CallTypeCode" start = "24" end = "27"/> <Field name = "DateOfCallString" start = "28" end = "35"/> </Mapping> <Mapping Code = "USGE" TargetClass = "dsl.Usage"> <Field name = "CustomerID" start = "4" end = "8"/> <Field name = "CustomerName" start = "9" end = "22"/> <Field name = "Cycle" start = "30" end = "30"/> <Field name = "ReadDate" start = "31" end = "36"/> </Mapping> </ReaderConfiguration>

  11. Syntax • Abstract Syntax - concrete syntax

  12. DSL 2 mapping SVCL dsl.ServiceCall 4-18: CustomerName 19-23: CustomerID 24-27 : CallTypeCode 28-35 : DateOfCallString mapping USGE dsl.Usage 4-8 : CustomerID 9-22: CustomerName 30-30: Cycle 31-36: ReadDate

  13. DSL 3 mapping('SVCL', ServiceCall) do extract 4..18, 'customer_name' extract 19..23, 'customer_ID' extract 24..27, 'call_type_code' extract 28..35, 'date_of_call_string' end mapping('USGE', Usage) do extract 9..22, 'customer_name' extract 4..8, 'customer_ID' extract 30..30, 'cycle' extract 31..36, 'read_date' end

  14. Brownie Example take(MicrowaveableDish) do melt((1/4).cup.butter) mix :with => 6.tablespoon.cocoa add 1.cup.sugar, 2.egg, (1/2).teaspoon.vanilla, (1/3).cup.flour, (1/4).teaspoon.salt mix bake :in => BakingPan, :for => 40.minutes, :at => 325.degrees end

  15. RSpec • Demo

  16. Pro/Cons Evolving into Generality!

  17. Different DSL‘s • Why do we need DSL‘s? • Represent easily businessrules in code

  18. Different kinds of DSL‘ • Video

  19. Domain Experts • Read and understand • Not necessarly write!

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