nnnock
A naive, unoptimized, very literal implementation of the Urbit project's Nock VM in Scala.
Because, why not?
For the core implementation, see here.
For a quick program testing the examples given with the spec, see here.
To run the test program, just download sbt and execute sbt run from the base directory of this repository.
Lamely, there is no parser, but you can evaluate expressions as a kind of scala-internal DSL. Expressions like [a b c d] should be written as Cell(a,b,c,d). Evaluate using the function *( noun ). For example:
swaldman@whisper:~/development/gitproj/nnnock$ sbt console
Welcome to Scala version 2.10.2 (Java HotSpot(TM) 64-Bit Server VM, Java 1.7.0_17).
Type in expressions to have them evaluated.
Type :help for more information.
scala> import com.mchange.sc.v1.nnnock._;
import com.mchange.sc.v1.nnnock._
scala> *( Cell(42,Cell(8,Cell(1,0),8,Cell(1,6,Cell(5,Cell(0,7),4,0,6),Cell(0,6),9,2,Cell(0,2),Cell(4,0,6),0,7),9,2,0,1)) )
res0: com.mchange.sc.v1.nnnock.Noun = Atom(41)