.10.dp.source-code.eval.scala Maven / Gradle / Ivy
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//-- license info
/*
Copyright 2010 Aaron J. Radke
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package cc.drx
/* Eval object to behave like Twitter's eval but more drx like available api's */
object Eval{
import scala.reflect.runtime._
import scala.reflect.runtime.universe._
import scala.tools.reflect.ToolBox
// import scala.reflect.runtime.universe //val cm = universe.runtimeMirror(getClass.getClassLoader)
private val cm = universe.runtimeMirror(getClass.getClassLoader)
private val toolbox = cm.mkToolBox()
// private lazy val toolbox = scala.reflect.runtime.currentMirror.mkToolBox()
type EvalExpr = () => Any
// def compile(code: String): () => Any = toolbox compile treeOf(code)
def compile(code: String):EvalExpr = {
val tree = toolbox parse code
toolbox compile tree
}
def evalAny(code: String): Any = compile(code)()
def eval[T](code: String): T = evalAny(code).asInstanceOf[T]
def main(args:Array[String]) = {
val argsCode = args.mkString(" ").trim
val code = if(argsCode != "") argsCode else "2+2"
val res = eval[Int]( code )
println(res)
}
}