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package scala.tools.partest
import scala.language.experimental.macros
object Util {
/**
* `trace("".isEmpty)` will return `true` and as a side effect print the following to standard out.
* {{{
* trace> "".isEmpty
* res: Boolean = true
*
* }}}
*
* An alternative to [[scala.tools.partest.ReplTest]] that avoids the inconvenience of embedding
* test code in a string.
*/
def trace[A](a: A): A = macro traceImpl[A]
import scala.reflect.macros.blackbox.Context
def traceImpl[A: c.WeakTypeTag](c: Context)(a: c.Expr[A]): c.Expr[A] = {
import c.universe._
import definitions._
// xeno.by: reify shouldn't be used explicitly before the final release of 2.10.0,
// because this impairs reflection refactorings
//
// val exprCode = c.literal(show(a.tree))
// val exprType = c.literal(show(a.actualType))
// reify {
// println(s"trace> ${exprCode.splice}\nres: ${exprType.splice} = ${a.splice}\n")
// a.splice
// }
c.Expr(Block(
List(Apply(
Select(Ident(PredefModule), TermName("println")),
List(Apply(
Select(Apply(
Select(Ident(ScalaPackage), TermName("StringContext")),
List(
Literal(Constant("trace> ")),
Literal(Constant("\\nres: ")),
Literal(Constant(" = ")),
Literal(Constant("\\n")))),
TermName("s")),
List(
Literal(Constant(show(a.tree))),
Literal(Constant(show(a.actualType))),
a.tree))))),
a.tree))
}
}
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