AST Transformations: Groovy’s best kept secret by Andres Almiray

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The document discusses AST (Abstract Syntax Tree) transformations in Groovy, which allow modifying code structure at compile time. It covers the standard AST transformations included in Groovy, how to build local and global AST transformations, and additional tools for working with ASTs. The speaker is an experienced Java and Groovy developer who is a Groovy committer and project lead for the Griffon framework.

Technologie Bildung

AST
TRANSFORMATIONS:
GROOVY’S BEST
KEPT SECRET
ANDRES ALMIRAY
@AALMIRAY

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

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

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

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

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

GLOBALAST
TRANSFORMATIONS
Groovy – Grab
Grails – GORM API
Griffon – Threading injection
Spock – the whole shebang

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

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

ADDITIONAL TOOLS
AST browser
AST Builder

DOCS? DON’T MIND IF I DO
https://github.com/melix/ast-workshop
Setup gradle 1.6 (or use gradlew)
Browse docs/gen/workshop.html

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

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AST Transformations: Groovy’s best kept secret by Andres Almiray

1. AST TRANSFORMATIONS: GROOVY’S BEST KEPT SECRET ANDRES ALMIRAY @AALMIRAY

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?

10.

11. AST TRANSFOR MATIONS

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

13.

14.

15.

16.

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

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

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

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

21. BUILDING YOUR OWN AST

22.

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

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

25.

26.

27.

28.

29.

30.

31.

32.

33.

34.

35.

36. ADDITIONAL TOOLS AST browser AST Builder

37.

38.

39.

40. DOCS? DON’T MIND IF I DO https://github.com/melix/ast-workshop Setup gradle 1.6 (or use gradlew) Browse docs/gen/workshop.html

41.

42.

43.

44.

45.

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

AST Transformations: Groovy’s best kept secret by Andres Almiray

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