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ValDefTransform.scala
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ValDefTransform.scala
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package cps.macros.forest
import scala.quoted._
import cps._
import cps.macros._
import cps.macros.common._
import cps.macros.misc._
object ValDefTransform:
def fromBlock[F[_]:Type,C<:CpsMonadContext[F]:Type](using Quotes)(
cpsCtx: TransformationContext[F,Unit,C],
valDef: quotes.reflect.ValDef): CpsExpr[F,Unit] = {
import quotes.reflect._
import cpsCtx._
if cpsCtx.flags.debugLevel >= 15 then
cpsCtx.log(s"ValDefExpr:fromBlock, valDef=$valDef")
val rhs = valDef.rhs.getOrElse(
throw MacroError(s"val $valDef without right part in block ", cpsCtx.patternCode)
)
val rhsType = TransformUtil.veryWiden(rhs.tpe).asType
rhsType match
case '[et] =>
if cpsCtx.flags.debugLevel > 15 then
cpsCtx.log(s"ValDef::rightPart is ${TransformUtil.safeShow(rhs)}")
val cpsRight = Async.nestTransform(rhs.asExprOf[et],cpsCtx)
if (cpsRight.isAsync) then
if (cpsCtx.flags.debugLevel > 15)
cpsCtx.log(s"rightPart is async")
RhsFlatMappedCpsExpr(using quotes)(monad, Seq(), valDef, cpsRight, CpsExpr.unit(monad))
else
if (cpsCtx.flags.debugLevel > 15)
cpsCtx.log(s"ValDef: rightPart no async, rhs.isChanged = ${cpsRight.isChanged} cpsRight.transformed=${TransformUtil.safeShow(cpsRight.transformed.asTerm)}")
val rhsTerm = cpsRight.syncOrigin.get.asTerm
val nextValDef = if (cpsRight.isChanged) {
ValDef(valDef.symbol, Some(rhsTerm.changeOwner(valDef.symbol)))
} else
valDef
ValWrappedCpsExpr(using quotes)(monad, Seq(), nextValDef, CpsExpr.unit(monad) )
case _ =>
throw MacroError(s"Can't concretize type of right-part $rhs ", rhs.asExpr)
}
class RhsFlatMappedCpsExpr[F[_]:Type, T:Type, V:Type](using thisQuotes: Quotes)
(monad: Expr[CpsMonad[F]],
prev: Seq[ExprTreeGen],
oldValDef: quotes.reflect.ValDef,
cpsRhs: CpsExpr[F,V],
next: CpsExpr[F,T]
)
extends AsyncCpsExpr[F,T](monad, prev) {
override def fLast(using Quotes) =
import quotes.reflect._
next.syncOrigin match
case Some(nextOrigin) =>
'{
${monad}.map(${cpsRhs.transformed})((v:V) =>
${buildAppendBlockExpr('v, nextOrigin)})
}
case None =>
'{
${monad}.flatMap(${cpsRhs.transformed})((v:V)=>
${buildAppendBlockExpr('v, next.transformed)})
}
override def prependExprs(exprs: Seq[ExprTreeGen]): CpsExpr[F,T] =
if (exprs.isEmpty)
this
else
RhsFlatMappedCpsExpr(using thisQuotes)(monad, exprs ++: prev,oldValDef,cpsRhs,next)
override def append[A:quoted.Type](e: CpsExpr[F,A])(using Quotes) =
RhsFlatMappedCpsExpr(using thisQuotes)(monad,prev,oldValDef,cpsRhs,next.append(e))
private def buildAppendBlock(using Quotes)(rhs:quotes.reflect.Term,
exprTerm:quotes.reflect.Term): quotes.reflect.Term =
{
import quotes.reflect._
import scala.quoted.Expr
val castedOldValDef = oldValDef.asInstanceOf[quotes.reflect.ValDef]
val valDef = ValDef(castedOldValDef.symbol, Some(rhs.changeOwner(castedOldValDef.symbol)))
exprTerm.changeOwner(castedOldValDef.symbol.owner) match
case Block(stats,last) =>
last match
case Closure(mech,optType) =>
Block(valDef::Nil,Block(stats,last))
case _ =>
Block(valDef::stats, last)
case other =>
Block(valDef::Nil,other)
}
private def buildAppendBlockExpr[A:Type](using Quotes)(rhs: Expr[V], expr:Expr[A]):Expr[A] =
import quotes.reflect._
buildAppendBlock(rhs.asTerm,expr.asTerm).asExprOf[A]
}
class ValWrappedCpsExpr[F[_]:Type, T:Type, V:Type](using Quotes)(
monad: Expr[CpsMonad[F]],
prev: Seq[ExprTreeGen],
oldValDef: quotes.reflect.ValDef,
next: CpsExpr[F,T] ) extends AsyncCpsExpr[F,T](monad,prev):
override def isAsync = next.isAsync
override def syncOrigin(using Quotes): Option[Expr[T]] = next.syncOrigin.map{ n =>
import quotes.reflect._
val valDef: Statement = oldValDef.asInstanceOf[quotes.reflect.ValDef]
val prevStats: List[Statement] = prev.map(_.extract.changeOwner(valDef.symbol.owner)).toList
val outputTerm = n.asTerm.changeOwner(valDef.symbol.owner) match
case lambda@Lambda(params,body) =>
Block( prevStats ++: List(valDef), lambda)
case block@Block(statements, last) =>
TransformUtil.prependStatementsToBlock(prevStats ++: List(valDef), block )
case other =>
Block( prevStats ++: List(valDef), other)
outputTerm.asExprOf[T]
}
override def fLast(using Quotes) = next.fLast
override def transformed(using Quotes) = {
import quotes.reflect._
val valDef = oldValDef.asInstanceOf[quotes.reflect.ValDef]
val prevWithNewOwner = prev.map(_.extract.changeOwner(valDef.symbol.owner))
val block = next.transformed.asTerm.changeOwner(valDef.symbol.owner) match
case block@Block(stats, e) =>
TransformUtil.prependStatementsToBlock(prevWithNewOwner ++: List(valDef), block)
case other =>
Block( prevWithNewOwner ++: List(valDef) , other)
block.asExprOf[F[T]]
}
override def prependExprs(exprs: Seq[ExprTreeGen]): CpsExpr[F,T] =
if (exprs.isEmpty)
this
else
ValWrappedCpsExpr[F,T,V](using quotes)(monad, exprs ++: prev, oldValDef, next)
override def append[A:quoted.Type](e:CpsExpr[F,A])(using Quotes) =
ValWrappedCpsExpr(using quotes)(monad, prev,
oldValDef.asInstanceOf[quotes.reflect.ValDef],
next.append(e))
def prependPrev(using qctx:Quotes)(term: quotes.reflect.Term): quotes.reflect.Term =
import quotes.reflect._
if (prev.isEmpty) {
term
} else {
val prevExtracted = prev.toList.map(_.extract)
val retval = TransformUtil.prependStatementsToTerm(prevExtracted, term)
retval.changeOwner(Symbol.spliceOwner)
}