scala - What are the ways to convert a String into runnable code? -

i not find how convert string runnable code, instance:

val = "new string('yo')" // conversion println(i) 

should print

yo 

after conversion.

i found following example in post:

import scala.tools.nsc.interpreter.iloop import java.io.stringreader import java.io.stringwriter import java.io.printwriter import java.io.bufferedreader import scala.tools.nsc.settings  object funcrunner extends app {    val line = "sin(2 * pi * 400 * t)"    val lines = """import scala.math._     |var t = 1""".stripmargin    val in = new stringreader(lines + "\n" + line + "\nval f = (t: int) => " + line)   val out = new stringwriter    val settings = new settings    val looper = new iloop(new bufferedreader(in), new printwriter(out))   val res = looper process settings   console println s"[$res] $out" } 

link: how convert string text input function in scala

but seems scala.tools not available anymore, , i'm newbie in scala not figure out how replace it. , may there other ways now.

thanks !

you can simple execute code contained inside string using quasiquotes(experimental module).

import scala.reflect.runtime.universe._ import scala.reflect.runtime.currentmirror import scala.tools.reflect.toolbox  // compile , run code use toolbox api. val toolbox = currentmirror.mktoolbox()  // write code starting q  , put inside double quotes. // note : have use triple quotes if have double quotes usage in code. val code1 = q"""new string("hello")""" //compile , run code. val result1 = toolbox.compile(code1)()  // example  val code2 = q"""  case class a(name:string,age:int){     def f = (name,age)  }  val = new a("your name",22)  a.f  """   val result2 = toolbox.compile(code2)() 

output in repl :

// exiting paste mode, interpreting.  import scala.reflect.runtime.universe._ import scala.reflect.runtime.currentmirror import scala.tools.reflect.toolbox toolbox: scala.tools.reflect.toolbox[reflect.runtime.universe.type] = scala.tools.reflect.toolboxfactory$toolboximpl@69b34f89 code1: reflect.runtime.universe.tree = new string("hello") result1: = hello code2: reflect.runtime.universe.tree = {   case class extends scala.product scala.serializable {     <caseaccessor> <paramaccessor> val name: string = _;     <caseaccessor> <paramaccessor> val age: int = _;     def <init>(name: string, age: int) = {       super.<init>();       ()     };     def f = scala.tuple2(name, age)   };   val = new a("your name", 22);   a.f } result2: = (your name,22)  scala>  

to learn more quasiquotes : http://docs.scala-lang.org/overviews/quasiquotes/setup.html