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Inline pprint to avoid binary incompatibilities
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276
metaconfig-pprint/shared/src/main/scala-2/metaconfig/pprint/TPrintImpl.scala
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,276 @@ | ||
| package metaconfig.pprint | ||
| import language.experimental.macros | ||
| import reflect.macros.blackbox.Context | ||
|
|
||
| trait TPrintLowPri { | ||
| implicit def default[T]: TPrint[T] = macro TPrintLowPri.typePrintImpl[T] | ||
| } | ||
| object TPrintLowPri { | ||
| sealed trait WrapType | ||
| object WrapType { | ||
| case object NoWrap extends WrapType | ||
| case object Infix extends WrapType | ||
| case object Tuple extends WrapType | ||
| } | ||
| def typePrintImpl[T: c.WeakTypeTag](c: Context): c.Expr[TPrint[T]] = { | ||
| // Used to provide "empty string" values in quasiquotes | ||
|
|
||
| import c.universe._ | ||
| val tpe = weakTypeOf[T] | ||
| val rendered = typePrintImplRec(c)(tpe, rightMost = true).render | ||
| val res = c.Expr[TPrint[T]]( | ||
| q"_root_.metaconfig.pprint.TPrint.recolor(_root_.fansi.Str($rendered))" | ||
| ) | ||
| res | ||
| } | ||
|
|
||
| val functionTypes: Set[String] = | ||
| Range.inclusive(0, 22).map(i => s"scala.Function$i").toSet | ||
| val tupleTypes: Set[String] = | ||
| Range.inclusive(0, 22).map(i => s"scala.Tuple$i").toSet | ||
|
|
||
| def typePrintImplRec[T]( | ||
| c: Context | ||
| )(tpe: c.Type, rightMost: Boolean): fansi.Str = { | ||
| typePrintImplRec0(c)(tpe, rightMost)._1 | ||
| } | ||
| def typePrintImplRec0[T]( | ||
| c: Context | ||
| )(tpe: c.Type, rightMost: Boolean): (fansi.Str, WrapType) = { | ||
| import c.universe._ | ||
| def printSymString(s: Symbol) = | ||
| if (s.name.decodedName.toString.startsWith("_$")) "_" | ||
| else s.name.decodedName.toString.stripSuffix(".type") | ||
|
|
||
| def literalColor(s: fansi.Str): fansi.Str = fansi.Color.Green(s) | ||
| def printSym(s: Symbol): fansi.Str = literalColor(printSymString(s)) | ||
|
|
||
| def printSymFull(s: Symbol): fansi.Str = { | ||
| if (lookup(s)) printSym(s) | ||
| else printSymFull(s.owner) ++ "." ++ printSym(s) | ||
| } | ||
|
|
||
| /** | ||
| * Looks up a symbol in the enclosing scope and returns | ||
| * whether it exists in scope by the same name | ||
| */ | ||
| def lookup(s: Symbol) = { | ||
| val cas = c.asInstanceOf[reflect.macros.runtime.Context] | ||
| val g = cas.global | ||
| val gName = s.name.asInstanceOf[g.Name] | ||
| val lookedUps = | ||
| for (n <- Stream(gName.toTermName, gName.toTypeName)) yield { | ||
| cas.callsiteTyper.context | ||
| .lookupSymbol(n, _ => true) | ||
| .symbol | ||
| } | ||
|
|
||
| if (!s.isType) { | ||
| // Try to de-reference `val` references | ||
| lookedUps.exists(x => x == s || x.tpe.termSymbol == s.asTerm) | ||
| } else { | ||
| // Try to resolve aliases for types | ||
| lookedUps.exists(x => | ||
| x == s || x.tpe.typeSymbol == s.asInstanceOf[g.Symbol].tpe.typeSymbol | ||
| ) | ||
| } | ||
| } | ||
|
|
||
| def prefixFor(pre: Type, sym: Symbol): 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") => | ||
| typePrintImplRec(c)(pre, false) ++ "." | ||
| case x: TypeRef => literalColor(typePrintImplRec(c)(pre, true)) ++ "#" | ||
| case x: SingleType => | ||
| literalColor(typePrintImplRec(c)(pre, false)) ++ "." | ||
| case x: ThisType => literalColor(typePrintImplRec(c)(pre, false)) ++ "." | ||
| case x => fansi.Str("(") ++ typePrintImplRec(c)(pre, true) ++ ")#" | ||
| } | ||
|
|
||
| val prefix = if (!lookup(sym)) sep else fansi.Str("") | ||
| prefix ++ printSym(sym) | ||
| } | ||
|
|
||
| def printArgSyms(args: List[Symbol]): fansi.Str = { | ||
| def added = | ||
| args | ||
| .map { x => | ||
| val TypeBounds(lo, hi) = x.info | ||
| printSym(x) ++ printBounds(lo, hi) | ||
| } | ||
| .reduceLeft[fansi.Str]((l, r) => l ++ ", " ++ r) | ||
|
|
||
| if (args == Nil) fansi.Str("") else fansi.Str("[") ++ added ++ "]" | ||
| } | ||
| def printArgs(args: List[Type]): fansi.Str = { | ||
| def added = | ||
| args | ||
| .map(typePrintImplRec(c)(_, true)) | ||
| .reduceLeft[fansi.Str]((l, r) => l ++ ", " ++ r) | ||
|
|
||
| if (args == Nil) fansi.Str("") else fansi.Str("[") ++ added ++ "]" | ||
| } | ||
|
|
||
| def printBounds(lo: Type, hi: Type) = { | ||
| val loTree = | ||
| if (lo =:= typeOf[Nothing]) fansi.Str("") | ||
| else fansi.Str(" >: ") ++ typePrintImplRec(c)(lo, true) | ||
| val hiTree = | ||
| if (hi =:= typeOf[Any]) fansi.Str("") | ||
| else fansi.Str(" <: ") ++ typePrintImplRec(c)(hi, true) | ||
| loTree ++ hiTree | ||
| } | ||
|
|
||
| def showRefinement(quantified: List[Symbol]) = { | ||
| def stmts = | ||
| for { | ||
| t <- quantified | ||
| suffix <- t.info match { | ||
| case PolyType(typeParams, resultType) => | ||
| val paramTree = printArgSyms( | ||
| t.asInstanceOf[TypeSymbol].typeParams | ||
| ) | ||
| val resultBounds = | ||
| if (resultType =:= typeOf[Any]) fansi.Str("") | ||
| else fansi.Str(" <: ") ++ typePrintImplRec(c)(resultType, true) | ||
|
|
||
| Some(paramTree ++ resultBounds) | ||
| case TypeBounds(lo, hi) | ||
| if t.toString.contains("$") && lo =:= typeOf[Nothing] && hi =:= typeOf[ | ||
| Any | ||
| ] => | ||
| None | ||
| case TypeBounds(lo, hi) => | ||
| Some(printBounds(lo, hi)) | ||
| } | ||
| } yield { | ||
| if (t.toString.endsWith(".type")) { | ||
| val TypeBounds(lo, hi) = t.info | ||
| val RefinedType(parents, defs) = hi | ||
| val filtered = internal.refinedType( | ||
| parents.filter(x => !(x =:= typeOf[scala.Singleton])), | ||
| defs | ||
| ) | ||
|
|
||
| fansi.Str("val ") ++ literalColor( | ||
| t.name.toString.stripSuffix(".type") | ||
| ) ++ | ||
| ": " ++ typePrintImplRec(c)(filtered, true) | ||
| } else { | ||
| fansi.Str("type ") ++ printSym(t) ++ suffix | ||
| } | ||
| } | ||
| if (stmts.length == 0) None | ||
| else Some(stmts.reduceLeft((l, r) => l + "; " + r)) | ||
| } | ||
|
|
||
| tpe match { | ||
| case TypeBounds(lo, hi) => | ||
| val res = printBounds(lo, hi) | ||
| (fansi.Str("_") ++ res, WrapType.NoWrap) | ||
| case ThisType(sym) => | ||
| ( | ||
| printSymFull(sym) + (if (sym.isPackage || sym.isModuleClass) "" | ||
| else ".this.type"), | ||
| WrapType.NoWrap | ||
| ) | ||
|
|
||
| case SingleType(NoPrefix, sym) => | ||
| (printSym(sym) ++ (if (rightMost) ".type" else ""), WrapType.NoWrap) | ||
| case SingleType(pre, sym) => | ||
| ( | ||
| prefixFor(pre, sym) ++ (if (rightMost) ".type" else ""), | ||
| WrapType.NoWrap | ||
| ) | ||
| // Special-case operator two-parameter types as infix | ||
| case TypeRef(pre, sym, List(left, right)) | ||
| if lookup(sym) && sym.name.encodedName.toString != sym.name.decodedName.toString => | ||
| ( | ||
| typePrintImplRec(c)(left, true) ++ " " ++ printSym(sym) ++ " " ++ typePrintImplRec( | ||
| c | ||
| )(right, true), | ||
| WrapType.Infix | ||
| ) | ||
|
|
||
| case TypeRef(pre, sym, args) if functionTypes.contains(sym.fullName) => | ||
| args match { | ||
| case Seq(r) => | ||
| ( | ||
| fansi.Str("() => ") ++ typePrintImplRec(c)(r, true), | ||
| WrapType.Infix | ||
| ) | ||
|
|
||
| case many => | ||
| val (left, leftWrap) = typePrintImplRec0(c)(many.head, true) | ||
|
|
||
| if (many.size == 2 && leftWrap == WrapType.NoWrap) { | ||
| ( | ||
| left ++ " => " ++ typePrintImplRec(c)(many(1), true), | ||
| WrapType.Infix | ||
| ) | ||
| } else | ||
| ( | ||
| fansi.Str("(") ++ | ||
| fansi.Str.join( | ||
| (left +: many.init.tail.map(typePrintImplRec(c)(_, true))), | ||
| sep = ", " | ||
| ) ++ | ||
| ") => " ++ typePrintImplRec(c)(many.last, true), | ||
| WrapType.Infix | ||
| ) | ||
| } | ||
| case TypeRef(pre, sym, args) if tupleTypes.contains(sym.fullName) => | ||
| ( | ||
| fansi.Str("(") ++ | ||
| fansi.Str | ||
| .join(args.map(typePrintImplRec(c)(_, true)), sep = ", ") ++ | ||
| ")", | ||
| WrapType.Tuple | ||
| ) | ||
|
|
||
| case TypeRef(NoPrefix, sym, args) => | ||
| (printSym(sym) ++ printArgs(args), WrapType.NoWrap) | ||
| case TypeRef(pre, sym, args) => | ||
| if (sym.fullName == "scala.<byname>") | ||
| ( | ||
| fansi.Str("=> ") ++ typePrintImplRec(c)(args(0), true), | ||
| WrapType.Infix | ||
| ) | ||
| else (prefixFor(pre, sym) ++ printArgs(args), WrapType.NoWrap) | ||
| case et @ ExistentialType(quantified, underlying) => | ||
| ( | ||
| showRefinement(quantified) match { | ||
| case None => typePrintImplRec(c)(underlying, true) | ||
| case Some(block) => | ||
| typePrintImplRec(c)(underlying, true) ++ " forSome { " ++ block ++ " }" | ||
| }, | ||
| WrapType.NoWrap | ||
| ) | ||
| case AnnotatedType(annots, tp) => | ||
| val mapped = annots | ||
| .map(x => " @" + typePrintImplRec(c)(x.tpe, true)) | ||
| .reduceLeft((x, y) => x + y) | ||
|
|
||
| ( | ||
| typePrintImplRec(c)(tp, true) + mapped, | ||
| WrapType.NoWrap | ||
| ) | ||
| case RefinedType(parents, defs) => | ||
| val pre = | ||
| if (parents.forall(_ =:= typeOf[AnyRef])) "" | ||
| else | ||
| parents | ||
| .map(typePrintImplRec(c)(_, true)) | ||
| .reduceLeft[fansi.Str]((l, r) => l ++ " with " ++ r) | ||
| ( | ||
| pre + (if (defs.isEmpty) "" else "{" ++ defs.mkString(";") ++ "}"), | ||
| WrapType.NoWrap | ||
| ) | ||
| case ConstantType(value) => | ||
| (fansi.Str(value.value.toString()), WrapType.NoWrap) | ||
| } | ||
| } | ||
|
|
||
| } |
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