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miniboxing.plugin.transform.interop.coerce.InteropAnnotationChecker.scala Maven / Gradle / Ivy
//
// _____ .__ .__ ___. .__ scala-miniboxing.org
// / \ |__| ____ |__|\_ |__ ____ ___ ___|__| ____ ____
// / \ / \ | | / \ | | | __ \ / _ \ \ \/ /| | / \ / ___\
// / Y \| || | \| | | \_\ \( <_> ) > < | || | \ / /_/ >
// \____|__ /|__||___| /|__| |___ / \____/ /__/\_ \|__||___| / \___ /
// \/ \/ \/ \/ \/ /_____/
// Copyright (c) 2011-2015 Scala Team, École polytechnique fédérale de Lausanne
//
// Authors:
// * Vlad Ureche
//
package miniboxing
package plugin
package transform
package interop
package coerce
/*
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Frog clipart credits: www.frog-life-cycle.com
ASCII transformation: www.glassgiant.com/ascii/
*/
trait InteropAnnotationCheckers {
this: InteropCoerceComponent =>
import global._
import interop._
object mbFunctionAnnotationChecker extends AnnotationChecker{
/**
* Check the annotations on two types conform.
* Q: Does T <: @storage T?
* A: It depends. It conforms before the adaptation phase. If doesn't after :)
*
* LDL FTW -- Boil frog, boil!
*/
override def annotationsConform(tpe1: Type, tpe2: Type): Boolean = {
if (interopCoercePhase != null && global.phase.id > interopCoercePhase.id) {
val res1 = tpe1.isMbFunction ^ tpe2.isMbFunction
val res2 = tpe2.isWildcard
// if (tpe1.isMbFunction || tpe2.isMbFunction)
// println(tpe1 + " <: " + tpe2 + " ==> " + res1 + " " + res2 + " ==> " + (!res1 || res2))
!res1 || res2
} else {
true
}
}
/** Refine the computed least upper bound of a list of types.
* All this should do is add annotations. */
override def annotationsLub(tp: Type, ts: List[Type]): Type = {
val res =
if (ts.forall(_.isMbFunction)) // note: forall!
if (tp.isMbFunction)
tp
else {
tp.withMbFunction
}
else
if (tp.isMbFunction)
tp.withoutMbFunction
else
tp
res
}
/** Refine the computed greatest lower bound of a list of types.
* All this should do is add annotations. */
override def annotationsGlb(tp: Type, ts: List[Type]): Type =
annotationsLub(tp, ts)
}
}
