metaconfig.pprint.TPrintImpl.scala Maven / Gradle / Ivy
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/* MIT License
Copyright (c) 2019 Li Haoyi
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE. */
package metaconfig.pprint
trait TPrintLowPri {
inline given default[T]: TPrint[T] = ${ TPrintLowPri.typePrintImpl[T] }
}
object TPrintLowPri {
import scala.quoted._
sealed trait WrapType
object WrapType {
case object NoWrap extends WrapType
case object Infix extends WrapType
case object Tuple extends WrapType
}
val functionTypes = Range.inclusive(0, 22).map(i => s"scala.Function$i").toSet
val tupleTypes = Range.inclusive(0, 22).map(i => s"scala.Tuple$i").toSet
def typePrintImpl[T](using Quotes, Type[T]): Expr[TPrint[T]] = {
import quotes.reflect._
def literalColor(s: fansi.Str): fansi.Str = {
fansi.Color.Green(s)
}
def printSymString(s: String) =
if (s.toString.startsWith("_$")) "_"
else s.toString.stripSuffix(".type")
def printBounds(lo: TypeRepr, hi: TypeRepr): fansi.Str = {
val loTree =
if (lo =:= TypeRepr.of[Nothing]) None
else Some(fansi.Str(" >: ") ++ rec(lo))
val hiTree =
if (hi =:= TypeRepr.of[Any]) None
else Some(fansi.Str(" <: ") ++ rec(hi))
val underscore = fansi.Str("_")
loTree.orElse(hiTree).map(underscore ++ _).getOrElse(underscore)
}
def printSym(s: String): fansi.Str = literalColor(fansi.Str(s))
// TODO: We don't currently use this method
def prefixFor(pre: TypeTree, sym: String): fansi.Str = {
// Depending on what the prefix is, you may use `#`, `.`
// or even need to wrap the prefix in parentheses
val sep = pre match {
case x if x.toString.endsWith(".type") =>
rec(pre.tpe) ++ "."
}
sep ++ printSym(sym)
}
def printArgs(args: List[TypeRepr]): fansi.Str = {
fansi.Str("[") ++ printArgs0(args) ++ "]"
}
def printArgs0(args: List[TypeRepr]): fansi.Str = {
val added = fansi.Str.join(
args.map {
case TypeBounds(lo, hi) =>
printBounds(lo, hi)
case tpe: TypeRepr =>
rec(tpe, false)
},
sep = ", "
)
added
}
object RefinedType {
def unapply(tpe: TypeRepr): Option[(TypeRepr, List[(String, TypeRepr)])] =
tpe match {
case Refinement(p, i, b) =>
unapply(p)
.map { case (pp, bs) =>
(pp, (i -> b) :: bs)
}
.orElse(Some((p, (i -> b) :: Nil)))
case _ => None
}
}
def rec(tpe: TypeRepr, end: Boolean = false): fansi.Str = rec0(tpe)._1
def rec0(tpe: TypeRepr, end: Boolean = false): (fansi.Str, WrapType) =
tpe match {
case TypeRef(NoPrefix(), sym) =>
(printSym(sym), WrapType.NoWrap)
// TODO: Add prefix handling back in once it works!
case TypeRef(_, sym) =>
(printSym(sym), WrapType.NoWrap)
case AppliedType(tpe, args) =>
if (functionTypes.contains(tpe.typeSymbol.fullName)) {
(
if (args.size == 1) fansi.Str("() => ") ++ rec(args.last)
else {
val (left, wrap) = rec0(args(0))
if (args.size == 2 && wrap == WrapType.NoWrap) {
left ++ fansi.Str(" => ") ++ rec(args.last)
} else
fansi.Str("(") ++ printArgs0(args.dropRight(1)) ++ fansi.Str(
") => "
) ++ rec(args.last)
},
WrapType.Infix
)
} else if (tupleTypes.contains(tpe.typeSymbol.fullName))
(
fansi.Str("(") ++ printArgs0(args) ++ fansi.Str(")"),
WrapType.Tuple
)
else
(printSym(tpe.typeSymbol.name) ++ printArgs(args), WrapType.NoWrap)
case RefinedType(tpe, refinements) =>
val pre = rec(tpe)
lazy val defs = fansi.Str.join(
refinements.collect {
case (name, tpe: TypeRepr) =>
fansi.Str("type " + name + " = ") ++ rec(tpe)
case (name, TypeBounds(lo, hi)) =>
fansi.Str("type " + name) ++ printBounds(lo, hi) ++ rec(tpe)
},
sep = "; "
)
(
pre ++ (if (refinements.isEmpty) fansi.Str("")
else fansi.Str("{") ++ defs ++ "}"),
WrapType.NoWrap
)
case AnnotatedType(parent, annot) =>
(rec(parent, end), WrapType.NoWrap)
case _ =>
(fansi.Str(Type.show[T]), WrapType.NoWrap)
}
val value: fansi.Str = rec(TypeRepr.of[T])
'{ TPrint.recolor(fansi.Str(${ Expr(value.render) })) }
}
}