README.md

• inspired by macrocosm and inkytonik's blog post

Macros.scala

import scala.reflect.macros.Context
import scala.util.matching.Regex
import java.util.regex.PatternSyntaxException
 
object Macros {
  implicit class RegexContext(val c: String) {
    def regex(): Regex = macro regexImpl
  }
 
  def regexImpl(c: Context)(): c.Expr[Regex] = {
    import c.universe._
    c.prefix.tree match {
      case Apply(Select(_, _), List(Literal(Constant(str: String)))) =>
        try{
          str.r
        }catch{
          case e: PatternSyntaxException => c.abort(c.enclosingPosition, e.toString)
        }
        val Apply(fun, _) = reify(new Regex("")).tree
        c.Expr[Regex](Apply.apply(fun, c.literal(str).tree :: Nil))
    }
  }
}

Main.scala

import Macros._

object Main extends App{
  println("foo|bar".regex) // compile success !
  println("[foo".regex) // compile error !
  println("foo$".regex)
}