Scripting from Scala

Question

I have a little project with an editor, some special need I had and which I hacked together in an afternoon. A co-worker looked over my shoulder (don't you hate that?) and said "Oh neat, but can it do X?"

So, to combine my ever-lasting need to learn new things and to enable some extensions on that little editor, I want to put some simple manipulation functions into there. And thus, I want to enable some scripting.

I found some tutorials about the ScriptEngine, that is not the problem. The problem is that it seems only to support JavaScript via Rhino. I have them all installed via apt-get: JRuby, Jython, Groovy, but the ScriptEngine doesn't know them.

What I would prefer is dropping a dependency in my build.sbt. Maybe someone knows a way to do that properly?

And if I resume to JavaScript, can I safely assume Rhino is installed on every machine with a JDK?

You can safely assume Rhino is installed on every machine with a JDK version 6 or later (version 5 may also work) — Dónal
– Dónal, Commented Oct 7, 2011 at 8:25

schmmd · Accepted Answer · 2011-10-08 15:45:35Z

1

Here is an article about embedding a Scala interpreter. This might be overkill for what you are doing, however.

http://suereth.blogspot.com/2009/04/embedding-scala-interpreter.html

You could also look at the scaladocs for an interpreter directly.

http://www.scala-lang.org/archives/downloads/distrib/files/nightly/docs/compiler/scala/tools/nsc/interpreter/package.html

If they are really simple manipulation functions, you could write your own language using parser combinators.

http://www.codecommit.com/blog/scala/the-magic-behind-parser-combinators

answered Oct 8, 2011 at 15:45

schmmd

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Alex Dean · Accepted Answer · 2011-10-06 17:46:12Z

0

Stir some Groovy into your Java apps is a developerWorks tutorial which doesn't depend on ScriptEngine but instead uses groovy.lang.GroovyClassLoader - I had been meaning to try adapting this to Scala but hadn't got round to it yet (let me know how it goes).

When adapting it to Scala, remember that:

ClassLoader parent = CLEmbedGroovy.class.getClassLoader();

is written:

val parent: ClassLoader = classOf[CLEmbedGroovy].getClassLoader()

Further down that article there are other interesting options such as GroovyScriptEngine. SBT-wise I think (source) you just need to drop in:

val groovyAll1.0Jsr = "groovy" % "groovy-all-1.0-jsr" % "05"

Good luck!

edited Oct 6, 2011 at 17:46

answered Oct 6, 2011 at 17:40

Alex Dean

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