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Merge pull request #6038 from dotty-staging/autolift
Fix #5986: Add autolift implicit conversion
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‎docs/docs/reference/other-new-features/principled-meta-programming.md

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@@ -600,6 +600,12 @@ Using lifting, we can now give the missing definition of `showExpr` in the intro
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That is, the `showExpr` method converts its `Expr` argument to a string (`code`), and lifts
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the result back to an `Expr[String]` using the `toExpr` wrapper.
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**Note**: the `toExpr` extension method can be ommited by importing an implicit
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conversion with `import scala.quoted.autolift._`. The programmer is able to
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declutter slightly the code at the cost of readable _phase distinction_ between
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stages.
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## Implementation
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### Syntax

‎library/src-bootstrapped/scala/quoted/package.scala

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@@ -2,6 +2,10 @@ package scala
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package object quoted {
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object autolift {
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implicit def autoToExpr[T: Liftable](x: T): Expr[T] = x.toExpr
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}
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implicit class LiftExprOps[T](val x: T) extends AnyVal {
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def toExpr(implicit ev: Liftable[T]): Expr[T] = ev.toExpr(x)
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}

‎tests/disabled/run/xml-interpolation-3/XmlQuote_1.scala

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import scala.quoted._
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import scala.tasty.Tasty
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import scala.quoted.autolift._
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import scala.language.implicitConversions
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@@ -14,6 +15,6 @@ object XmlQuote {
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def impl(receiver: StringContext, args: Expr[Seq[Any]]): Expr[Xml] = {
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val string = receiver.parts.mkString("??")
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'{new Xml(${string.toExpr}, ($args).toList)}
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'{new Xml(${string}, ($args).toList)}
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}
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}

‎tests/neg-with-compiler/quote-run-in-macro-1/quoted_1.scala

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import scala.quoted._
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import scala.quoted.autolift._
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import scala.quoted.Toolbox.Default._
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object Macros {
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inline def foo(i: => Int): Int = ${ fooImpl('i) }
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def fooImpl(i: Expr[Int]): Expr[Int] = {
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val y: Int = i.run
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y.toExpr
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y
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}
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}

‎tests/neg-with-compiler/quote-run-in-macro-2/quoted_1.scala

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import scala.quoted._
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import scala.quoted.autolift._
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import scala.quoted.Toolbox.Default._
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object Macros {
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inline def foo(i: => Int): Int = ${ fooImpl('i) }
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def fooImpl(i: Expr[Int]): Expr[Int] = {
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val y: Int = i.run
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y.toExpr
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y
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}
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}

‎tests/neg/inline-case-objects/Macro_1.scala

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import scala.quoted._
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import scala.quoted.autolift._
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object Macros {
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def impl(foo: Any): Expr[String] = foo.getClass.getCanonicalName.toExpr
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def impl(foo: Any): Expr[String] = foo.getClass.getCanonicalName
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}
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class Bar {

‎tests/neg/inline-macro-staged-interpreter/Macro_1.scala

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import scala.quoted._
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import scala.quoted.autolift._
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object E {
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}
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case class I(n: Int) extends E[Int] {
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def lift: Expr[Int] = n.toExpr
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def lift: Expr[Int] = n
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}
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case class Plus[T](x: E[T], y: E[T])(implicit op: Plus2[T]) extends E[T] {

‎tests/neg/inline-option/Macro_1.scala

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import scala.quoted._
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import scala.quoted.autolift._
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object Macro {
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def impl(opt: Option[Int]): Expr[Int] = opt match {
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case Some(i) => i.toExpr
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case Some(i) => i
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case None => '{-1}
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}
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}

‎tests/neg/inline-tuples-1/Macro_1.scala

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import scala.quoted._
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import scala.quoted.autolift._
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object Macros {
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def tup1(tup: Tuple1[Int]): Expr[Int] = tup.productIterator.map(_.asInstanceOf[Int]).sum.toExpr
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def tup2(tup: Tuple2[Int, Int]): Expr[Int] = tup.productIterator.map(_.asInstanceOf[Int]).sum.toExpr
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def tup3(tup: Tuple3[Int, Int, Int]): Expr[Int] = tup.productIterator.map(_.asInstanceOf[Int]).sum.toExpr
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def tup4(tup: Tuple4[Int, Int, Int, Int]): Expr[Int] = tup.productIterator.map(_.asInstanceOf[Int]).sum.toExpr
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def tup5(tup: Tuple5[Int, Int, Int, Int, Int]): Expr[Int] = tup.productIterator.map(_.asInstanceOf[Int]).sum.toExpr
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def tup6(tup: Tuple6[Int, Int, Int, Int, Int, Int]): Expr[Int] = tup.productIterator.map(_.asInstanceOf[Int]).sum.toExpr
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def tup7(tup: Tuple7[Int, Int, Int, Int, Int, Int, Int]): Expr[Int] = tup.productIterator.map(_.asInstanceOf[Int]).sum.toExpr
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def tup8(tup: Tuple8[Int, Int, Int, Int, Int, Int, Int, Int]): Expr[Int] = tup.productIterator.map(_.asInstanceOf[Int]).sum.toExpr
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def tup9(tup: Tuple9[Int, Int, Int, Int, Int, Int, Int, Int, Int]): Expr[Int] = tup.productIterator.map(_.asInstanceOf[Int]).sum.toExpr
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def tup10(tup: Tuple10[Int, Int, Int, Int, Int, Int, Int, Int, Int, Int]): Expr[Int] = tup.productIterator.map(_.asInstanceOf[Int]).sum.toExpr
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def tup11(tup: Tuple11[Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int]): Expr[Int] = tup.productIterator.map(_.asInstanceOf[Int]).sum.toExpr
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def tup12(tup: Tuple12[Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int]): Expr[Int] = tup.productIterator.map(_.asInstanceOf[Int]).sum.toExpr
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def tup13(tup: Tuple13[Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int]): Expr[Int] = tup.productIterator.map(_.asInstanceOf[Int]).sum.toExpr
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def tup14(tup: Tuple14[Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int]): Expr[Int] = tup.productIterator.map(_.asInstanceOf[Int]).sum.toExpr
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def tup15(tup: Tuple15[Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int]): Expr[Int] = tup.productIterator.map(_.asInstanceOf[Int]).sum.toExpr
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def tup16(tup: Tuple16[Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int]): Expr[Int] = tup.productIterator.map(_.asInstanceOf[Int]).sum.toExpr
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def tup17(tup: Tuple17[Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int]): Expr[Int] = tup.productIterator.map(_.asInstanceOf[Int]).sum.toExpr
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def tup18(tup: Tuple18[Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int]): Expr[Int] = tup.productIterator.map(_.asInstanceOf[Int]).sum.toExpr
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def tup19(tup: Tuple19[Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int]): Expr[Int] = tup.productIterator.map(_.asInstanceOf[Int]).sum.toExpr
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def tup20(tup: Tuple20[Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int]): Expr[Int] = tup.productIterator.map(_.asInstanceOf[Int]).sum.toExpr
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def tup21(tup: Tuple21[Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int]): Expr[Int] = tup.productIterator.map(_.asInstanceOf[Int]).sum.toExpr
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def tup22(tup: Tuple22[Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int]): Expr[Int] = tup.productIterator.map(_.asInstanceOf[Int]).sum.toExpr
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def tup1(tup: Tuple1[Int]): Expr[Int] = tup.productIterator.map(_.asInstanceOf[Int]).sum
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def tup2(tup: Tuple2[Int, Int]): Expr[Int] = tup.productIterator.map(_.asInstanceOf[Int]).sum
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def tup3(tup: Tuple3[Int, Int, Int]): Expr[Int] = tup.productIterator.map(_.asInstanceOf[Int]).sum
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def tup4(tup: Tuple4[Int, Int, Int, Int]): Expr[Int] = tup.productIterator.map(_.asInstanceOf[Int]).sum
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def tup5(tup: Tuple5[Int, Int, Int, Int, Int]): Expr[Int] = tup.productIterator.map(_.asInstanceOf[Int]).sum
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def tup6(tup: Tuple6[Int, Int, Int, Int, Int, Int]): Expr[Int] = tup.productIterator.map(_.asInstanceOf[Int]).sum
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def tup7(tup: Tuple7[Int, Int, Int, Int, Int, Int, Int]): Expr[Int] = tup.productIterator.map(_.asInstanceOf[Int]).sum
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def tup8(tup: Tuple8[Int, Int, Int, Int, Int, Int, Int, Int]): Expr[Int] = tup.productIterator.map(_.asInstanceOf[Int]).sum
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def tup9(tup: Tuple9[Int, Int, Int, Int, Int, Int, Int, Int, Int]): Expr[Int] = tup.productIterator.map(_.asInstanceOf[Int]).sum
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def tup10(tup: Tuple10[Int, Int, Int, Int, Int, Int, Int, Int, Int, Int]): Expr[Int] = tup.productIterator.map(_.asInstanceOf[Int]).sum
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def tup11(tup: Tuple11[Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int]): Expr[Int] = tup.productIterator.map(_.asInstanceOf[Int]).sum
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def tup12(tup: Tuple12[Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int]): Expr[Int] = tup.productIterator.map(_.asInstanceOf[Int]).sum
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def tup13(tup: Tuple13[Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int]): Expr[Int] = tup.productIterator.map(_.asInstanceOf[Int]).sum
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def tup14(tup: Tuple14[Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int]): Expr[Int] = tup.productIterator.map(_.asInstanceOf[Int]).sum
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def tup15(tup: Tuple15[Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int]): Expr[Int] = tup.productIterator.map(_.asInstanceOf[Int]).sum
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def tup16(tup: Tuple16[Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int]): Expr[Int] = tup.productIterator.map(_.asInstanceOf[Int]).sum
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def tup17(tup: Tuple17[Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int]): Expr[Int] = tup.productIterator.map(_.asInstanceOf[Int]).sum
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def tup18(tup: Tuple18[Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int]): Expr[Int] = tup.productIterator.map(_.asInstanceOf[Int]).sum
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def tup19(tup: Tuple19[Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int]): Expr[Int] = tup.productIterator.map(_.asInstanceOf[Int]).sum
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def tup20(tup: Tuple20[Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int]): Expr[Int] = tup.productIterator.map(_.asInstanceOf[Int]).sum
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def tup21(tup: Tuple21[Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int]): Expr[Int] = tup.productIterator.map(_.asInstanceOf[Int]).sum
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def tup22(tup: Tuple22[Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int]): Expr[Int] = tup.productIterator.map(_.asInstanceOf[Int]).sum
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}

‎tests/neg/quote-interpolator-core-old.scala

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import scala.quoted._
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import scala.quoted.autolift._
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// This test checks the correct interpretation of the inlined value class
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}
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def fInterpolation(sc: StringContext, args: Seq[Expr[Any]]): Expr[String] = {
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val str: Expr[String] = sc.parts.mkString("").toExpr
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val str: Expr[String] = sc.parts.mkString("")
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val args1: Expr[Seq[Any]] = liftSeq(args)
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'{ $str.format($args1: _*) }
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}

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