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package scala.reflect.makro
// todo. introduce context hierarchy
// the most lightweight context should just expose the stuff from the SIP
// the full context should include all traits from scala.reflect.makro (and probably reside in scala-compiler.jar)
trait Context extends Aliases
with CapturedVariables
with Enclosures
with Infrastructure
with Names
with Reifiers
with Reporters
with Settings
with Symbols
with Typers
with Util {
/** The mirror that corresponds to the compile-time universe */
val mirror: scala.reflect.api.Universe
/** The type of the prefix tree from which the macro is selected */
type PrefixType
/** The prefix tree from which the macro is selected */
val prefix: Expr[PrefixType]
/** Alias to the underlying mirror's reify */
def reify[T](expr: T): Expr[T] = macro Context.reify[T]
}
object Context {
def reify[T](cc: Context{ type PrefixType = Context })(expr: cc.Expr[T]): cc.Expr[cc.prefix.value.Expr[T]] = {
import cc.mirror._
// [Eugene] how do I typecheck this without undergoing this tiresome (and, in general, incorrect) procedure?
val prefix: Tree = Select(cc.prefix, newTermName("mirror"))
val prefixTpe = cc.typeCheck(TypeApply(Select(prefix, newTermName("asInstanceOf")), List(SingletonTypeTree(prefix)))).tpe
prefix setType prefixTpe
try cc.reifyTree(prefix, expr)
catch {
case ex: Throwable =>
// [Eugene] cannot pattern match on an abstract type, so had to do this
if (ex.getClass.toString.endsWith("$ReificationError")) {
ex match {
case cc.ReificationError(pos, msg) =>
cc.error(pos, msg)
EmptyTree
}
} else if (ex.getClass.toString.endsWith("$UnexpectedReificationError")) {
ex match {
case cc.UnexpectedReificationError(pos, err, cause) =>
if (cause != null) throw cause else throw ex
}
} else {
throw ex
}
}
}
}
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