Codegeneration With Xtend
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Code generation with Xtend provides faster and better supported code generation compared to Xpand. It uses templates with expressions for concatenating strings. Types are statically checked like Java but higher-order functions are supported through libraries. Modules can be created and dependencies injected to customize code generation. The IDE supports features like content assist and debugging.
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Codegeneration With Xtend
- 1. Code Generation with Sven Efftinge - itemis
- 2. What is it?
- 3. Successor to Xpand Built with
- 4. Why ? much faster (as fast as Java) much better IDE support generalized set of features simpler
- 6. Template Expression (aka string concatenation) same syntax as in Xpand just an expression greyspace support!
- 8. static typing simply Java no pluggable type system can be emulated with active annotations
- 15. higher-order functions map, filter, flatten, etc. it’s just library!
- 16. class TypeProviderExample { def getHourlyData() { data.weather.hourlys } def getTimeWithHighestSwell() { hourlyData.sortBy[swellheightM].head.time } def getAverageWindSpeed() { hourlyData.map[windspeedkmph].reduce[a,b|a+b] / hourlyData.size } }
- 17. dynamic dispatch
- 18. dynamic dispatch
- 19. dynamic dispatch easily debuggable & extendable
- 20. dynamic dispatch def generate(ETypedElement e) { switch e { EAttribute : ''' attribute ''' EReference case e.isContainment: ''' containment reference ''' EReference : ''' reference ''' EOperation : ''' operation ''' default : throw new IllegalArgumentException("not handled : "+e) } } dispatch over type and state first come first serve
- 21. modularization
- 22. AOP?
- 24. class MainGenerator { @Inject extension EcoreGen ecoreGenerator def doGenerate(EClass it) ''' class «name» { «FOR f : EStructuralFeatures» «f.generate» «ENDFOR» } ''' } class EcoreGen { def dispatch generate(EAttribute attribute) ''' generate attribute ''' def dispatch generate(EReference reference) ''' generate reference ''' def dispatch generate(EOperation operation) ''' generate operation ''' } declare the dependency
- 25. class MySpecialEcoreGen extends EcoreGen { override dispatch generate(EAttribute attribute) ''' special EAttribute ''' def dispatch generate(EParameter param) ''' parameter ''' } class CustomizedGenerator { def static void main(String[] args) { val injector = Guice::createInjector [ bind(typeof(EcoreGen)).to(typeof(MySpecialEcoreGen)) ] val mainGenerator = injector.getInstance(typeof(MainGenerator)) mainGenerator.doGenerate(EcorePackage::eINSTANCE.EClass) } } Extend the class you want to modify Use Guice to wire up the generator
- 26. content assist syntax coloring quick assist outline rename refactoring formating call hierarchy type hierarchy extract method debugging etc... IDE Support
- 27. But why always a DSL?
- 38. future work tooling via library more macro support embedded languages snappiness!
- 39. Thank you! @svenefftinge / @xtext / @xtendlang (c) 2013 by