diff options
Diffstat (limited to 'core/shared/src/main/scala/magnolia.scala')
| -rw-r--r-- | core/shared/src/main/scala/magnolia.scala | 199 |
1 files changed, 132 insertions, 67 deletions
diff --git a/core/shared/src/main/scala/magnolia.scala b/core/shared/src/main/scala/magnolia.scala index 0e5728c..bcb695f 100644 --- a/core/shared/src/main/scala/magnolia.scala +++ b/core/shared/src/main/scala/magnolia.scala @@ -98,15 +98,11 @@ object Magnolia { } val typeConstructor = getTypeMember("Typeclass") - val pTypeConstructor = getTypeMember("ParamType") def getMethod[T](termName: String): Option[MethodSymbol] = { val term = TermName(termName) - val combineClass = c.prefix.tree.tpe.baseClasses - .find { cls => - cls.asType.toType.decl(term) != NoSymbol - } - combineClass.map { c => + val cls = c.prefix.tree.tpe.baseClasses.find(_.asType.toType.decl(term) != NoSymbol) + cls.map { c => c.asType.toType.decl(term).asTerm.asMethod } } @@ -204,14 +200,14 @@ object Magnolia { def directInferImplicit(genericType: c.Type, typeConstructor: Type): Option[Typeclass] = { val genericTypeName: String = genericType.typeSymbol.name.decodedName.toString.toLowerCase - val assignedName: TermName = TermName(c.freshName(s"${genericTypeName}Typeclass")) - val typeSymbol = genericType.typeSymbol - val classType = if (typeSymbol.isClass) Some(typeSymbol.asClass) else None - val isCaseClass = classType.map(_.isCaseClass).getOrElse(false) - val isCaseObject = classType.map(_.isModuleClass).getOrElse(false) - val isSealedTrait = classType.map(_.isSealed).getOrElse(false) - - val primitives = Set(typeOf[Double], + lazy val assignedName: TermName = TermName(c.freshName(s"${genericTypeName}Typeclass")) + lazy val typeSymbol = genericType.typeSymbol + lazy val classType = if (typeSymbol.isClass) Some(typeSymbol.asClass) else None + lazy val isCaseClass = classType.map(_.isCaseClass).getOrElse(false) + lazy val isCaseObject = classType.map(_.isModuleClass).getOrElse(false) + lazy val isSealedTrait = classType.map(_.isSealed).getOrElse(false) + + lazy val primitives = Set(typeOf[Double], typeOf[Float], typeOf[Short], typeOf[Byte], @@ -220,24 +216,47 @@ object Magnolia { typeOf[Char], typeOf[Boolean]) - val isValueClass = genericType <:< typeOf[AnyVal] && !primitives.exists(_ =:= genericType) + lazy val isValueClass = genericType <:< typeOf[AnyVal] && !primitives.exists(_ =:= genericType) - val resultType = appliedType(typeConstructor, genericType) + lazy val resultType = appliedType(typeConstructor, genericType) + lazy val liftedParamType: Tree = getMethod("param").map { sym => + tq"${c.prefix}.ParamType[$genericType, _]" + }.getOrElse(tq"$magnoliaPkg.Param[$typeConstructor, $genericType]") + + lazy val liftedSubtypeType: Tree = getMethod("subtype").map { sym => + tq"${c.prefix}.SubtypeType[$genericType, _]" + }.getOrElse(tq"$magnoliaPkg.Subtype[$typeConstructor, $genericType]") + + lazy val caseClassMethod = getMethod("caseClass").map { sym => + q"${c.prefix}.caseClass[$genericType, $liftedParamType]" + }.getOrElse(q"$magnoliaPkg.Magnolia.caseClass[$typeConstructor, $genericType, $liftedParamType]") + + lazy val caseClassParamNames = getMethod("caseClass").map { sym => + sym.paramLists.head.map(_.name.decodedName.toString) + }.getOrElse(List("name", "isCaseObject", "isValueClass", "parameters", "constructor")) + + lazy val sealedTraitMethod = getMethod("sealedTrait").map { sym => + q"${c.prefix}.sealedTrait[$genericType, $liftedParamType]" + }.getOrElse(q"$magnoliaPkg.Magnolia.sealedTrait[$typeConstructor, $genericType, $liftedParamType]") + + lazy val sealedTraitParamNames = getMethod("sealedTrait").map { sym => + sym.paramLists.head.map(_.name.decodedName.toString) + }.getOrElse(List("name", "subtypes")) + val result = if (isCaseObject) { - // FIXME: look for an alternative which isn't deprecated on Scala 2.12+ val obj = companionRef(genericType) val className = genericType.typeSymbol.name.decodedName.toString - val paramType: Tree = getMethod("param").map { sym => - tq"${c.prefix}.ParamType[$genericType, _]" - }.getOrElse(tq"$magnoliaPkg.Param[$typeConstructor, $genericType]") - - val impl = q""" - ${c.prefix}.combine($magnoliaPkg.Magnolia.caseClass[$typeConstructor, $genericType, $paramType]( - $className, true, false, new $scalaPkg.Array(0), _ => $obj) - ) - """ + val parameters = caseClassParamNames.map { + case "name" => q"$className" + case "isCaseObject" => q"true" + case "isValueClass" => q"false" + case "parameters" => q"new $scalaPkg.Array(0)" + case "constructor" => q"(_ => $obj)" + } + + val impl = q"${c.prefix}.combine($caseClassMethod(..$parameters))" Some(Typeclass(genericType, impl)) } else if (isCaseClass || isValueClass) { val caseClassParameters = genericType.decls.collect { @@ -302,31 +321,49 @@ object Magnolia { val assignments = caseParams.zip(defaults).zipWithIndex.map { case ((CaseParam(param, typeclass, paramType, ref), defaultVal), idx) => val paramMethod: Tree = getMethod("param").map { sym => - q"${c.prefix}.param[$genericType, $paramType]" + q"${c.prefix}.param" }.getOrElse(q"$magnoliaPkg.Magnolia.param[$typeConstructor, $genericType, $paramType]") - q"""$paramsVal($idx) = $paramMethod(${param.name.decodedName.toString}, $ref, $defaultVal, _.${param.name})""" + + val paramNames = getMethod("param").map { sym => + sym.paramLists.head.map(_.name.decodedName.toString) + }.getOrElse(List("name", "typeclass", "default", "dereference")) + + val parameters: List[Tree] = paramNames.map { + case "name" => q"${param.name.decodedName.toString}" + case "typeclass" => q"$ref" + case "default" => q"$defaultVal" + case "dereference" => q"_.${param.name}" + case other => + c.abort(c.enclosingPosition, s"magnolia: method 'param' has an unexpected parameter with name '$other'; permitted parameter names: name, typeclass, default, dereference") + } + q"""$paramsVal($idx) = $paramMethod(..$parameters)""" } + val parameters = caseClassParamNames.map { + case "name" => q"$className" + case "isCaseObject" => q"false" + case "isValueClass" => q"$isValueClass" + case "parameters" => q"$paramsVal" + case "constructor" => q""" + ($fnVal: $liftedParamType => Any) => + new $genericType(..${caseParams.zipWithIndex.map { + case (typeclass, idx) => + q"$fnVal($paramsVal($idx)).asInstanceOf[${typeclass.paramType}]" + }}) + """ + } + + val impl = q"${c.prefix}.combine($caseClassMethod(..$parameters))" Some( Typeclass( genericType, q"""{ ..$preAssignments - val $paramsVal: $scalaPkg.Array[${c.prefix}.ParamType[$genericType, _]] = + val $paramsVal: $scalaPkg.Array[$liftedParamType] = new $scalaPkg.Array(${assignments.length}) ..$assignments - ${c.prefix}.combine($magnoliaPkg.Magnolia.caseClass[$typeConstructor, $genericType, ${c.prefix}.ParamType[$genericType, _]]( - $className, - false, - $isValueClass, - $paramsVal, - ($fnVal: ${c.prefix}.ParamType[$genericType, _] => Any) => - new $genericType(..${caseParams.zipWithIndex.map { - case (typeclass, idx) => - q"$fnVal($paramsVal($idx)).asInstanceOf[${typeclass.paramType}]" - }}) - )) + ${c.prefix}.combine($caseClassMethod(..$parameters)) }""" ) ) @@ -358,28 +395,40 @@ object Magnolia { } val assignments = typeclasses.zipWithIndex.map { - case ((typ, typeclass), idx) => - q"""$subtypesVal($idx) = $magnoliaPkg.Magnolia.subtype[$typeConstructor, $genericType, $typ]( - ${typ.typeSymbol.fullName.toString}, - $typeclass, - (t: $genericType) => t.isInstanceOf[$typ], - (t: $genericType) => t.asInstanceOf[$typ] - )""" + case ((subtype, typeclass), idx) => + val subtypeMethod: Tree = getMethod("subtype").map { sym => + q"${c.prefix}.subtype" + }.getOrElse(q"$magnoliaPkg.Magnolia.subtype[$typeConstructor, $genericType, $subtype]") + + val subtypeParamNames = getMethod("subtype").map { sym => + sym.paramLists.head.map(_.name.decodedName.toString) + }.getOrElse(List("name", "typeclass", "isType", "asType")) + + val parameters = subtypeParamNames.map { + case "name" => q"${subtype.typeSymbol.fullName.toString}" + case "typeclass" => q"$typeclass" + case "isType" => q"(t: $genericType) => t.isInstanceOf[$subtype]" + case "asType" => q"(t: $genericType) => t.asInstanceOf[$subtype]" + } + + q"""$subtypesVal($idx) = $subtypeMethod(..$parameters)""" + } + + val parameters = sealedTraitParamNames.map { + case "name" => q"$genericTypeName" + case "subtypes" => q"$subtypesVal: $scalaPkg.Array[$liftedSubtypeType]" } Some { Typeclass( genericType, q"""{ - val $subtypesVal: $scalaPkg.Array[$magnoliaPkg.Subtype[$typeConstructor, $genericType]] = + val $subtypesVal: $scalaPkg.Array[$liftedSubtypeType] = new $scalaPkg.Array(${assignments.size}) ..$assignments - ${c.prefix}.dispatch(new $magnoliaPkg.SealedTrait( - $genericTypeName, - $subtypesVal: $scalaPkg.Array[$magnoliaPkg.Subtype[$typeConstructor, $genericType]]) - ): $resultType + ${c.prefix}.dispatch($sealedTraitMethod(..$parameters)): $resultType }""" ) } @@ -388,7 +437,7 @@ object Magnolia { result.map { case Typeclass(t, r) => Typeclass(t, q"""{ - def $assignedName: $resultType = $r + lazy val $assignedName: $resultType = $r $assignedName }""") } @@ -441,30 +490,38 @@ object Magnolia { * * This method is intended to be called only from code generated by the Magnolia macro, and * should not be called directly from users' code. */ - def subtype[Tc[_], T, S <: T](name: String, tc: => Tc[S], isType: T => Boolean, asType: T => S) = + def subtype[Tc[_], T, S <: T](name: String, typeclass: => Tc[S], isType: T => Boolean, asType: T => S) = { + lazy val typeclassVal = typeclass new Subtype[Tc, T] { type SType = S def label: String = name - def typeclass: Tc[SType] = tc + def typeclass: Tc[SType] = typeclassVal def cast: PartialFunction[T, SType] = new PartialFunction[T, S] { def isDefinedAt(t: T) = isType(t) def apply(t: T): SType = asType(t) } } + } /** constructs a new [[Param]] instance * * This method is intended to be called only from code generated by the Magnolia macro, and * should not be called directly from users' code. */ def param[Tc[_], T, P](name: String, - typeclassParam: Tc[P], - defaultVal: => Option[P], - deref: T => P) = new Param[Tc, T] { - type PType = P - def label: String = name - def default: Option[PType] = defaultVal - def typeclass: Tc[PType] = typeclassParam - def dereference(t: T): PType = deref(t) + typeclass: Tc[P], + default: => Option[P], + dereference: T => P) = { + val typeclassVal = typeclass + val defaultVal = default + val dereferenceVal = dereference + + new Param[Tc, T] { + type PType = P + def label: String = name + def default: Option[PType] = defaultVal + def typeclass: Tc[PType] = typeclassVal + def dereference(t: T): PType = dereferenceVal(t) + } } /** constructs a new [[CaseClass]] instance @@ -472,13 +529,21 @@ object Magnolia { * This method is intended to be called only from code generated by the Magnolia macro, and * should not be called directly from users' code. */ def caseClass[Tc[_], T, ParamType](name: String, - obj: Boolean, - valClass: Boolean, - params: Array[ParamType], + isCaseObject: Boolean, + isValueClass: Boolean, + parameters: Array[ParamType], constructor: (ParamType => Any) => T) = - new CaseClass[Tc, T, ParamType](name, obj, valClass, params) { + new CaseClass[Tc, T, ParamType](name, isCaseObject, isValueClass, parameters) { def construct[R](param: ParamType => R): T = constructor(param) } + + /** constructs a new [[CaseClass]] instance + * + * This method is intended to be called only from code generated by the Magnolia macro, and + * should not be called directly from users' code. */ + def sealedTrait[Tc[_], T, SubType](name: String, + subtypes: Array[Subtype[Tc, T]]): SealedTrait[Tc, T] = + new SealedTrait[Tc, T](name, subtypes) } private[magnolia] case class DirectlyReentrantException() |