grooscript
@grooscript
http://grooscript.org
grooscript@gmail.com
Jorge Franco

About me
Developer, I love it
Lazy in english at school
Living in Madrid
Working at Osoco
Grooscript developer
@jfrancoleza
jorge.franco.leza@gmail.com

The players

Web developer
Leave your
comfort zone
Move to
the client side

Doesn’t run!
on browsers

Do something!
No excuses
You can do a library,
resolve issues,
create a plugin,
give feedback,
help other projects,
…
!
You will learn a lot

The wire

Groovy to Javascript converter
Groovy 2 to Javascript ECMAScript 5
Open source project, Apache 2 license
Library with Groovy and GPars dependencies
No special Javascript objects or functions
Converted code requires grooscript.js to run
Different conversion options
Grails plugin, npm package, gradle plugin
What is grooscript?

File.groovy File.js
Conversion!
Options
grooscript.js
Convert Groovy files

Groovy code

Javascript result

Javascript
Groovy
Java
MoreJavascriptfriendly
Types, inheritance, java 8, …
metaClass
ListsClosures
Operators
Dsl’s
ExpandoMaps
beans
methodMissing
Mixins
Categories

Limitations
Groovy / Java not fully supported
Working in groovy-core
No good support for inheritance
No methods with same name
Basic support in metaClass
No packages, no classes with same name
No metainfo, expandoMetaClass, class info
Only AST transformations applied in semantic phase
No complex Java / Groovy types
… see documentation for more info on grooscript.org

Directly convert code

Conversion options
convertDependencies - boolean - default false
classPath - List<String> or String - default null - Ex: ‘src/groovy’
customization - Closure - default null
mainContextScope - List<String> - default null
initialText / finalText - String - default null
recursive - boolean - default false

Convert dependencies option
Car.groovy
Wheel.groovy
Car.js
convert
== option
wheel
code
included

Main context scope
Customization
• Requires Groovy 2.1, the closure is passed to withConfig(conf)
• More info in http://docs.codehaus.org/display/GROOVY/Advanced+compiler+configuration
• Sometimes you don’t know where to find a variable
• When conversion is done, some variables come from other contexts
• grooscript.js sometimes tries to find missed variables with eval
• Node.js eval not working same way that browsers do
• You can define variables or function names with this option
• Ex. [‘$’, ‘myAwesomeFunction’, ‘myMissedVariable’]

Feature: Annotations
@GsNotConvert @GsNative

Feature: Daemon

>phantomjs myTest.js
Inject
grooscript.js
and jquery
Use Groovy
script abilities
I want to
be Groovier
@AST
http://phantomjs.org/
Please
code in
Groovy!

Mandatory Screen capture Before start test
More console info
Accept basic parameters
Works fine in GroovyTestCase
Not so well in Spock
Have to
define
Phantom.js
path
Feature: PhantomJsTest

Example

Feature: builder
grooscript-builder.js

Demo websockets with Vert.x
https://github.com/chiquitinxx/demoGroovyMeteor
http://www.meteor.com
https://vimeo.com/59395085

https://github.com/chiquitinxx/grooscript-vertx-plugin
http://www.grails.org/plugin/grooscript-vertx
v 0.4

Grooscript Vert.x Plugin
Convert Groovy code to Javascript
Run conversion daemon
Websockets
Eventbus bridge
New port open
Events in the client
Auto reload pages
Both are optional
http://grooscript.org/pluginManual/
v 1.3.1
Requires Java 1.7

Differences?Renders
on server
Renders
on the client
Conversions are cached with cache plugin
Grooscript tags auto - import js files needed

Grails
port 8080
Vert.x
port 8085
Browser
gsp
eventBus
http
websockets
Config.groovy
BootStrap.groovy Chat sample
main.gsp

More eventsBuilder
Where
Listen events Render on load
Send event message
= println
Execute on event message
Don’t use ${} in grooscript tags
Strong dependency Resources plugin
Can put code in a .groovy file

Domain classes in the client*
*Experimental, it requires Groovy 2.1 (grails 2.3)
• validate, clientValidations **
• hasErrors
• count
• list * without params
• get
• save * without params
• delete

Domain classes connected with the server*
*Experimental, it requires Groovy 2.1 (grails 2.3)
• list
• get
• save
• delete

PhantomJs Tests*
*Not working in Grails 2.3, need improvements
New test phase phantomjs
Tests in test/phantomjs
More features

features, features…
next release 0.5
Change resources plugin dependencies to Require.js
Improve domain options
PhantomJs tests improvements
Move to websockets with Spring 4 in 2.4
and many more…
Remote domain class to grails REST support

https://github.com/chiquitinxx/grooscript-gradle-plugin
v 0.2

Gradle plugin
Add in your build.gradle
http://grooscript.wordpress.com/2014/02/22/starting-with-grooscript/

Create more conversion tasks: http://grooscript.wordpress.com/2014/01/31/61/
Converted files destination
Require.js setup file
Files to be converted
Bind id’s to presenter properties

Demo springboot
http://projects.spring.io/spring-boot/
REST - Require.js - Grooscript Gradle Plugin - H2
https://github.com/chiquitinxx/springboot-rest-demo

https://github.com/chiquitinxx/grooscript/tree/master/npm

Last demo :)
Node.js is very fast!
http://grooscript.wordpress.com/2014/01/10/impressive-node-js-v8-speed/
https://github.com/chiquitinxx/colors

Final topics

Coming next months…
grooscript 0.5
gradle plugin 0.3
Improve Groovy support (Java 8 too) and Javascript friendly
Add jQuery and binder utilities
Do tests also with Node.js
Wait function in PhantomJs tests
Remove binder and integrates with web frameworks
website
Back to dynamic, online conversions and robots!
Improve documentation

Why would I use grooscript?
• Create small modules to use in your views
• You can continue developing in Groovy
• Can use dsl’s, typeCheck, AST’s,… in the browser
• You have all the java tools and IDE’s
• You can work with new Javascript tools from Groovy
• Don’t repeat code in two languages
• Single development environment
• Create your own architecture in Groovy
• Don’t learn another “to Javascript” tool

Thank you!
All people reading this
680 motivation clicks
Jetbrains for IntelliJ IDEA v13 open source license
Special thanks to René, @glaforge and @marioggar
Community, I love your feedback
Please…
Version 0.4.4, time to improve
Questions?

Beer time!