1. Andres
Almiray
@aalmiray
Groovy AST
Demystified

2. ABOUT THE SPEAKER
Java developer since the beginning
True believer in Open Source
Groovy committer since 2007
Project lead of the Griffon framework
Currently working for

3. AGENDA
AST, How did we get here?
AST Transformations
Building your own AST

4. AST,
HOW DID
WE GET
HERE?

11. AST
TRANSFOR
MATIONS

12. G
E
E
V
N
I
I
L
U
S

17. STANDARD GROOVY
DISTRO INCLUDES:
* @EqualsAndHashCode * @AutoClone
* @ToString * @AutoExternalize
* @TupleConstructor * @Synchronized
* @Canonical * @Field
* @InheritConstructors * @Grab
* @IndexedProperty * @GrabResolver
* @Lazy * @CompileStatic
* @PackageScope * @TypeChecked
* @NotYetImplemented

18. STANDARD GROOVY
DISTRO INCLUDES:
* @Bindable * @Log
* @Vetoable * @Slf4j
* @ListenerList * @Log4j
* @ConditionalInterrupt * @Commons
* @ThreadInterrupt * @Singleton
* @TimedInterrupt * @Immutable
* @WithReadLock * @Delegate
* @WithWriteLock * @Category
* @Newify * @Mixin

19. GROOVY ECOSYSTEM
BRINGS:
* @ByteCode * Griffon
* @Scalify * @EventPublisher
* @Threading
* GContracts * @PropertyListener
* @Invariant * @MVCAware
* @Requires * @MessageSourceAware
* @Ensures * @ResourceResolverAware
* Grails * @ResourcesAware
* @Entity * @ThreadingAware
* @TestFor

20. GLOBAL AST
TRANSFORMATIONS
Groovy – Grab
Grails – GORM API
Griffon – Threading injection
Spock – the whole shebang

21. BUILDING
YOUR OWN
AST

23. LOCAL AST
TRANSFORMATION
1. Define an @interface
• Easy peasy … right?
2. Define AST implementation
• huh ……
3. Profit!

24. GLOBAL AST
TRANSFORMATION
1. Add AST implementation entry to
• META-INF/services/
org.codehaus.groovy.transform.ASTTransformation
2. Define AST implementation
• ??? !!! ??? !!!
3. Profit!

36. ADDITIONAL TOOLS
AST browser
AST Builder

45. Thank You!
@aalmiray
andres.almiray@canoo.com