Implementing Domain-Specific Languages with Xtext and Xtend - Second Edition

Learn how to implement a DSL with Xtext and Xtend using easy-to-understand examples and best practices
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Implementing Domain-Specific Languages with Xtext and Xtend - Second Edition

Lorenzo Bettini

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Learn how to implement a DSL with Xtext and Xtend using easy-to-understand examples and best practices
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Book Details

ISBN 139781786464965
Paperback426 pages

Book Description

Xtext is an open source Eclipse framework for implementing domain-specific languages together with IDE functionalities. It lets you implement languages really quickly; most of all, it covers all aspects of a complete language infrastructure, including the parser, code generator, interpreter, and more.

This book will enable you to implement Domain Specific Languages (DSL) efficiently, together with their IDE tooling, with Xtext and Xtend. Opening with brief coverage of Xtext features involved in DSL implementation, including integration in an IDE, the book will then introduce you to Xtend as this language will be used in all the examples throughout the book. You will then explore the typical programming development workflow with Xtext when we modify the grammar of the DSL.

Further, the Xtend programming language (a fully-featured Java-like language tightly integrated with Java) will be introduced. We then explain the main concepts of Xtext, such as validation, code generation, and customizations of runtime and UI aspects. You will have learned how to test a DSL implemented in Xtext with JUnit and will progress to advanced concepts such as type checking and scoping. You will then integrate the typical Continuous Integration systems built in to Xtext DSLs and familiarize yourself with Xbase. By the end of the book, you will manually maintain the EMF model for an Xtext DSL and will see how an Xtext DSL can also be used in IntelliJ.

Table of Contents

Chapter 1: Implementing a DSL
Domain-Specific Languages
Implementing a DSL
IDE integration
Enter Xtext
The aim of this book
Summary
Chapter 2: Creating Your First Xtext Language
A DSL for entities
The Xtext generator
The Eclipse Modeling Framework (EMF)
Improvements to the DSL
Summary
Chapter 3: Working with the Xtend Programming Language
An introduction to Xtend
Xtend – a better Java with less "noise"
Additional operators
Summary
Chapter 4: Validation
Validation in Xtext
Quickfixes
Summary
Chapter 5: Code Generation
Introduction to code generation
Writing a code generator in Xtend
Integration with the Eclipse build mechanism
Standalone command-line compiler
Summary
Chapter 6: Customizing Xtext Components
Dependency injection
Google Guice in Xtext
Customizations of IDE concepts
Custom formatting
Other customizations
Summary
Chapter 7: Testing
Introduction to testing
JUnit 4
The ISetup interface
Implementing tests for your DSL
Test suite
Testing the UI
Testing and modularity
Clean code
Summary
Chapter 8: An Expression Language
The Expressions DSL
The grammar for the Expressions DSL
Left recursive grammars
Forward references
Typing expressions
Writing an interpreter
Optimizations and fine tuning
Summary
Chapter 9: Type Checking
SmallJava
First validation rules
Type checking
Improving the UI
Summary
Chapter 10: Scoping
Cross-reference resolution in Xtext
Custom scoping
Global scoping
Providing a library
Classes of the same package
Dealing with super
What to put in the index?
Additional automatic features
Providing a project wizard
Summary
Chapter 11: Continuous Integration
Eclipse features and p2 repositories
Release engineering
Introduction to Maven/Tycho
Using the Xtext project wizard
Continuous Integration systems
Your DSL editor on the Web
IntelliJ and Gradle
Pitfalls with Maven/Tycho
Concluding remarks
Summary
Chapter 12: Xbase
Introduction to Xbase
The Expressions DSL with Xbase
The Entities DSL with Xbase
Additional Xbase features
Summary
Chapter 13: Advanced Topics
Creating an Xtext project from an Ecore model
Switching to an imported Ecore model
Xcore
Extending Xbase
Summary
Chapter 14: Conclusions

What You Will Learn

  • Write Xtext grammar for a DSL;
  • Use Xtend as an alternative to Java to write cleaner, easier-to-read, and more maintainable code;
  • Build your Xtext DSLs easily with Maven/Tycho and Gradle;
  • Write a code generator and an interpreter for a DSL;
  • Explore the Xtext scoping mechanism for symbol resolution;
  • Test most aspects of the DSL implementation with JUnit;
  • Understand best practices in DSL implementations with Xtext and Xtend;
  • Develop your Xtext DSLs using Continuous Integration mechanisms;
  • Use an Xtext editor in a web application

Authors

Table of Contents

Chapter 1: Implementing a DSL
Domain-Specific Languages
Implementing a DSL
IDE integration
Enter Xtext
The aim of this book
Summary
Chapter 2: Creating Your First Xtext Language
A DSL for entities
The Xtext generator
The Eclipse Modeling Framework (EMF)
Improvements to the DSL
Summary
Chapter 3: Working with the Xtend Programming Language
An introduction to Xtend
Xtend – a better Java with less "noise"
Additional operators
Summary
Chapter 4: Validation
Validation in Xtext
Quickfixes
Summary
Chapter 5: Code Generation
Introduction to code generation
Writing a code generator in Xtend
Integration with the Eclipse build mechanism
Standalone command-line compiler
Summary
Chapter 6: Customizing Xtext Components
Dependency injection
Google Guice in Xtext
Customizations of IDE concepts
Custom formatting
Other customizations
Summary
Chapter 7: Testing
Introduction to testing
JUnit 4
The ISetup interface
Implementing tests for your DSL
Test suite
Testing the UI
Testing and modularity
Clean code
Summary
Chapter 8: An Expression Language
The Expressions DSL
The grammar for the Expressions DSL
Left recursive grammars
Forward references
Typing expressions
Writing an interpreter
Optimizations and fine tuning
Summary
Chapter 9: Type Checking
SmallJava
First validation rules
Type checking
Improving the UI
Summary
Chapter 10: Scoping
Cross-reference resolution in Xtext
Custom scoping
Global scoping
Providing a library
Classes of the same package
Dealing with super
What to put in the index?
Additional automatic features
Providing a project wizard
Summary
Chapter 11: Continuous Integration
Eclipse features and p2 repositories
Release engineering
Introduction to Maven/Tycho
Using the Xtext project wizard
Continuous Integration systems
Your DSL editor on the Web
IntelliJ and Gradle
Pitfalls with Maven/Tycho
Concluding remarks
Summary
Chapter 12: Xbase
Introduction to Xbase
The Expressions DSL with Xbase
The Entities DSL with Xbase
Additional Xbase features
Summary
Chapter 13: Advanced Topics
Creating an Xtext project from an Ecore model
Switching to an imported Ecore model
Xcore
Extending Xbase
Summary
Chapter 14: Conclusions

Book Details

ISBN 139781786464965
Paperback426 pages
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