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import scala.reflect.macros.BlackboxContext
object Macros {
def impl(c: BlackboxContext) = {
import c.universe._
val inscope = c.inferImplicitValue(c.mirror.staticClass("SourceLocation").toType)
val outer = c.Expr[SourceLocation](if (!inscope.isEmpty) inscope else Literal(Constant(null)))
val Apply(fun, args) = c.enclosingImplicits(0).tree
val fileName = fun.pos.source.file.file.getName
val line = fun.pos.line
val charOffset = fun.pos.point
def literal[T](x: T) = c.Expr[T](Literal(Constant(x)))
c.universe.reify { SourceLocation1(outer.splice, literal(fileName).splice, literal(line).splice, literal(charOffset).splice) }
}
implicit def sourceLocation: SourceLocation1 = macro impl
}
trait SourceLocation {
/** Source location of the outermost call */
val outer: SourceLocation
/** The name of the source file */
val fileName: String
/** The line number */
val line: Int
/** The character offset */
val charOffset: Int
}
case class SourceLocation1(val outer: SourceLocation, val fileName: String, val line: Int, val charOffset: Int) extends SourceLocation
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