scala - How to get range position from macro annotation? -


i'm using macro annotation instrument code. how can range position of expressions ?

@scalakata object sha {     val foo = "foo"      val bar = "bar"     foo; bar     // ... } // result: map((75, 78) -> "foo", (80, 83) -> "bar")

the instrumenting macro:

package com.scalakata.eval  import scala.reflect.macros.blackbox.context  import scala.language.experimental.macros import scala.annotation.staticannotation  object scalakatamacro {    def impl(c: context)(annottees: c.expr[any]*): c.expr[any] = {     import c.universe._       val result: tree = {       val eval = newtermname("eval$")       annottees.map(_.tree).tolist match {         case q"object $name { ..$body }" :: nil => {            val instr = newtermname("instr$")           implicit def lift = liftable[c.universe.position] { p =>             q"(${p.start}, ${p.end})"           }           def instrument(rhs: tree): tree = {             q"""             {               val t = $rhs               ${instr}(${rhs.pos}) = t               t             }             """           }            val bodyi = body.map {             case ident: ident => instrument(ident)             case otherwise => otherwise           }           q"""           object $name {              val $instr = scala.collection.mutable.map.empty[(int, int), any]              def $eval() = {               ..$bodyi               $instr             }           }           """         }       }     }     c.expr[any](result)   } }  class scalakata extends staticannotation {   def macrotransform(annottees: any*) = macro scalakatamacro.impl }

i have range option enabled scalacoptions += "-yrangepos"

i'm getting starting position: result: map((75, 75) -> "foo", (80, 80) -> "bar")

there bug in paradise corrupts range positions of macro arguments. it's fixed in freshly published 2.1.0-snapshot.

however, there's regression in scala 2.11.0 , 2.11.1 corrupts range positions. therefore able access range positions in macro annotations in 2.10.x or in upcoming 2.11.2 (scheduled end of july).


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