package scalaonscala

import scala.tools.nsc._
import scala.util.DynamicVariable

import org.jruby.Ruby


class Evaluator {
  val settings = new GenericRunnerSettings(println _)
  val i = new Interpreter(settings)

  {
    val origBootclasspath = settings.bootclasspath.value
    val compilerPath = jarPathOfClass("scala.tools.nsc.Interpreter")
    val libPath = jarPathOfClass("scala.ScalaObject")
    val pathList = List(compilerPath,libPath)
    settings.bootclasspath.value = (origBootclasspath :: pathList).mkString(java.io.File.separator)
  }

  def eval(line: String): Any = {
    i.interpret(line)
    Evaluator.result.value
  }

  def jarPathOfClass(className: String) = {
    val resource = className.split('.').mkString("/", "/", ".class")
    val path = getClass.getResource(resource).getPath
    val indexOfFile = path.indexOf("file:")
    val indexOfSeparator = path.lastIndexOf('!')
    path.substring(indexOfFile, indexOfSeparator)
  }
}

object Evaluator {
  val result = new DynamicVariable[Any](())
}

object EvalTest {
  def main(args: Array[String]): Unit = {
    val e = new Evaluator
    
    println("Hello, Scala!")
    var r = e.eval("println(\"Hello, Scala on Scala!\")")
    println(r)

    r = e.eval("println(\"Hello, Scala on Scala!!!!\")")
    println(r)

    val runtime = Ruby.getDefaultInstance();
    runtime.evalScriptlet("puts \"Hello, Ruby on Scala!\"");
    runtime.evalScriptlet("puts \"Hello, Ruby on Scala!!!!!\"");
  }
}

object Hoge {
  def somefunc = "mogemoge"
}