Is there a way to evaluate a arbitrary string from Scala as if the same text was entered into the Scala REPL directly? I mean, I would like to do something like this:
scala> eval("val x = 42") scala> x res2: Int = 42 Since the Scala REPL is accepting commands in an eval loop using jline (I believe) and then compiling/interpreting it, there has to be a way to submit an arbitrary line of text. I am willing to hack the Scala REPL if necessary.
No REPL hacking necessary—just switch to power user mode, which gives you access to the current scala.tools.nsc.interpreter.IMain as intp:
scala> :power ** Power User mode enabled - BEEP BOOP SPIZ ** ** :phase has been set to 'typer'. ** ** scala.tools.nsc._ has been imported ** ** global._ and definitions._ also imported ** ** Try :help, vals.<tab>, power.<tab> ** scala> intp.interpret("val x = 42") x: Int = 42 res0: scala.tools.nsc.interpreter.package.IR.Result = Success scala> x res1: Int = 42 This works since at least 2.9.1.
Another opportunity is to use Eval from Twitter Utility:
val x: Int = new Eval()("1 + 1") 
val and have that variable be visible to the REPL (if I'm wrong please correct me).