Xtext Webinar

http://live.eclipse.org/node/705 Eclipse Live Webinar on Sven Efftinge, Heiko Behrens itemis

Agenda What is Xtext? DSLs - An Example Underlying Technology Advanced Topics Questions & Answers

? What is

A Language Framework

Yet another Parser Generator? JavaCC

Yet another Parser Generator? t ha t! e th an smor No, it’ JavaCC

How does Xtext relate to ... IDE Meta-tooling Platform (IMP) Dynamic Language Toolkit (DLTK)

How does Xtext relate to ... IDE Meta-tooling Platform (IMP) ! at an th ore th is m X xt te Language Toolkit (DLTK) Dynamic

Is it a language workbench? JetBrains Meta Programming System Intentional Domain Workbench Microsoft Oslo

Is it a language workbench? le te ly m p rc e! it’s co s ou ut en JetBrains Meta Programming System ,b op Y es a nd as ed t ext-b Intentional Domain Workbench Microsoft Oslo

Xtext is a complete environment for development of textual - programming languages and - domain-speciﬁc languages. It is implemented in Java and is based on Eclipse, EMF, and Antlr.

Domain-Specific Language (DSL) A DSL is a formal, processable language targeting at a specific viewpoint or aspect of a software system. Its semantics, flexibility and notation is designed in order to support working with that viewpoint as good as possible.

Rd2-c2

“ Queen to c7. Check.” “ Rd2-c2 , rook at d2 moves to c2.”

Moves in Chess: !ook at a1 moves to a5. P iece S q uare A ction De stin ation "ishop at c8 captures knight at h3.n P iece S q uare io Action D es tinat # b1 x c3 Piece S qua re ction stination AD e $2 - g4 ation S A D quar e ction e stin

Rook a1 move a5 Bishop c8 capture h3 Knight Knight b1 capture c3 Queen Pawn g2 move g4 Game Move Source «enum» WhitePlayer * Destination Piece BlackPlayer Piece

"ishop at c8 captures knight at h3 " c8 x h3

Model (textﬁle) White: "Mayfield" Black: "Trinks" pawn at e2 moves to e4 pawn at f7 moves to g5 K b1 - c3 f7 - f5 queen at d1 moves to h5 // 1-0

Underlying Technology

ar Model m m ra G Generator Runtime Superclass Subclass Class LL(*) Parser ecore meta model editor

Java Persistence API (JPA) package templates; import java.io.Serializable; import java.util.*; import javax.persistence.*; @SuppressWarnings("serial") @Entity public class Customer implements Serializable { ! private Long id; ! private String name; ! private Address address; ! private Set<Order> orders = new HashSet<Order>(); ! // No-arg constructor ! public Customer() { ! } ! @Id ! public Long getId() { entity Customer { ! ! return id; ! } ! property name : String ! public void setId(Long id) { ! property address : Address ! ! this.id = id; ! } ! property orders : Order[] ! public String getName() { ! ! return name; } ! } ! public void setName(String name) { ! ! this.name = name; ! } ! public Address getAddress() { ! ! return address; ! } ! public void setAddress(Address address) { ! ! this.address = address; ! } ! @OneToMany ! public Collection<Order> getOrders() { ! ! return orders; ! } ! public void setOrders(Set<Order> orders) { ! ! this.orders = orders; ! } }

ar Model m m ra G Generator Fragments Generator Runtime Superclass Subclass Class LL(*) Parser ecore meta model editor

Composable Code Generator ! generator is composed of “fragments” ! fragments can contribute to: ! Manifest.MF ! plugin.xml ! Guice modules ! Add your own fragments

ar Model m m ra G Generator Runtime Google Guice Superclass Subclass Class LL(*) Parser ecore meta model editor

licensed by http://www.wordle.net/

MyCustomLabelProvider licensed by http://www.wordle.net/

Dependency Injection with Googlee !No dependency to concrete implementation !No explicit construction !Easy testing !Easy composition

Conﬁguration of Components in Xtext /** * used to register components to be used within the IDE. */ public class DomainmodelUiModule ! ! extends GeneratedDomainmodelUiModule { ! ! @Override ! public Class<? extends ILabelProvider> bindILabelProvider() { ! ! return MySpecialLabelProvider.class; ! } }

Advanced Topics

Integration with EMF eclipse Any EMF-based modeling Code Generator GMF Editor P R O J E C T Component <<abstract>> XMI XMIResource Resource XtextResource Text Parser Linker Serializer ValueConverter ScopeProvider Formatter

Working with Xtext // initialization and setup (only needed in standalone mode) new EntityStandaloneSetup().createInjectorAndDoEMFRegistration(); // standard EMF API usage ResourceSet resourceSet = new ResourceSet(); Resource resource = resourceSet.getResource(uriToModelFile, true); Model model = (Model) resource.getContents().get(0); // print the name of all types to the console for (Type type : model.getElements()) { System.out.println(type.getName()); }

Eclipse Helios •Model Index • Grammar Mixins • Base Language • UI Features

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Xtext Webinar

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