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REPL javax.script eval is cached result #7933

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scabug opened this issue Oct 25, 2013 · 3 comments
Closed

REPL javax.script eval is cached result #7933

scabug opened this issue Oct 25, 2013 · 3 comments
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@rjolly
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repl
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2.11.0-RC1

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@scabug
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scabug commented Oct 25, 2013

Reminder to fix.

scala> new IMain.Factory
res2: scala.tools.nsc.interpreter.IMain.Factory = scala.tools.nsc.interpreter.IMain$Factory@352b9aeb

scala> .getScriptEngine
res3: javax.script.ScriptEngine = scala.tools.nsc.interpreter.IMain@7505d7e7

scala> .asInstanceOf[Compilable]
res4: javax.script.Compilable = scala.tools.nsc.interpreter.IMain@7505d7e7

scala> .compile("val foo = 8")
res5: javax.script.CompiledScript = scala.tools.nsc.interpreter.IMain$WrappedRequest@749ccfd1

scala> .eval
res6: Object = 8

scala> res4 compile """println("hello") ; val bar = 8"""
res7: javax.script.CompiledScript = scala.tools.nsc.interpreter.IMain$WrappedRequest@7772d5dd

scala> res7.eval
hello
res8: Object = 8

scala> res7.eval
res9: Object = 8
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scabug commented Oct 25, 2013

Imported From: https://issues.scala-lang.org/browse/SI-7933?orig=1
Reporter: @som-snytt

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scabug commented Jan 30, 2014

@rjolly said:
Attempted solution in scala/scala#3433

@scabug scabug closed this as completed Feb 10, 2014
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scabug commented Sep 18, 2015

@som-snytt said:
This means compile and eval have different semantics with respect to REPL history:

scala> val e = engine.asInstanceOf[ScriptEngine with Compilable]
e: javax.script.ScriptEngine with javax.script.Compilable = scala.tools.nsc.interpreter.IMain@1f28c152

scala> val s = e.compile("val x = 42")
s: javax.script.CompiledScript = $anon$1@4e423aa2

scala> s.eval()
res0: Object = ()

scala> e.eval("x")
<console>:11: error: not found: value x
       x
       ^
javax.script.ScriptException: compile-time error
  at scala.tools.nsc.interpreter.IMain.compiled(IMain.scala:600)
  at scala.tools.nsc.interpreter.IMain.eval(IMain.scala:1066)
  at javax.script.AbstractScriptEngine.eval(AbstractScriptEngine.java:264)
  ... 33 elided

scala> e.eval("val x = 42")
res2: Object = 42

scala> e.eval("x")
res3: Object = 42

@scabug scabug added this to the 2.11.0-RC1 milestone Apr 7, 2017
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