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Diffstat (limited to 'examples/src/main/scala/typeclasses.scala')
-rw-r--r-- | examples/src/main/scala/typeclasses.scala | 127 |
1 files changed, 0 insertions, 127 deletions
diff --git a/examples/src/main/scala/typeclasses.scala b/examples/src/main/scala/typeclasses.scala deleted file mode 100644 index aaa74fd..0000000 --- a/examples/src/main/scala/typeclasses.scala +++ /dev/null @@ -1,127 +0,0 @@ -package magnolia.examples - -import scala.collection.immutable.ListMap -import scala.language.existentials -import scala.language.higherKinds - -import magnolia._ -import scala.reflect._ -import scala.reflect.macros._ -import scala.language.experimental.macros -import scala.annotation.unchecked.uncheckedVariance - - -object Show { - type Typeclass[T] = Show[String, T] - def join[T](context: JoinContext[Typeclass, T]): Show[String, T] = new Show[String, T] { - def show(value: T) = context.parameters.map { param => - s"${param.label}=${param.typeclass.show(param.dereference(value))}" - }.mkString(s"${context.typeName.split("\\.").last}(", ",", ")") - } - - def dispatch[T](subclasses: Seq[Subclass[Typeclass, T]])(value: T): String = - subclasses.map { sub => sub.cast.andThen { value => - sub.typeclass.show(sub.cast(value)) - } }.reduce(_ orElse _)(value) - - implicit val string: Show[String, String] = identity - implicit val int: Show[String, Int] = new Show[String, Int] { def show(s: Int): String = s.toString } - implicit def generic[T]: Show[String, T] = macro Magnolia.generic[T] -} - -trait Show[Out, T] { def show(value: T): Out } - -object Eq { - type Typeclass[T] = Eq[T] - def join[T](context: JoinContext[Eq, T]): Eq[T] = new Eq[T] { - def equal(value1: T, value2: T) = - context.parameters.forall { param => param.typeclass.equal(param.dereference(value1), param.dereference(value2)) } - } - - def dispatch[T](subclasses: Seq[Subclass[Eq, T]]): Eq[T] = new Eq[T] { - def equal(value1: T, value2: T) = - subclasses.map { case subclass => - subclass.cast.andThen { value => subclass.typeclass.equal(subclass.cast(value1), subclass.cast(value2)) } - }.reduce(_ orElse _)(value1) - } - - implicit val string: Eq[String] = _ == _ - implicit val int: Eq[Int] = _ == _ - implicit def generic[T]: Eq[T] = macro Magnolia.generic[T] -} - -trait Eq[T] { def equal(value: T, value2: T): Boolean } - -object Default { - type Typeclass[T] = Default[T] - def join[T](context: JoinContext[Default, T]): Default[T] = new Default[T] { - def default = context.construct { param => param.typeclass.default } - } - - def dispatch[T](subclasses: Seq[Subclass[Default, T]])(): Default[T] = new Default[T] { - def default = subclasses.head.typeclass.default - } - - implicit val string: Default[String] = new Default[String] { def default = "" } - implicit val int: Default[Int] = new Default[Int] { def default = 0 } - implicit def generic[T]: Default[T] = macro Magnolia.generic[T] -} - -trait Default[T] { def default: T } - -object Decoder { - def join[T](context: JoinContext[Decoder, T])(value: String): T = - context.construct { param => param.typeclass.decode(value) } - - def dispatch[T](subclasses: Seq[Subclass[Decoder, T]])(param: String): T = - subclasses.map { subclass => - { case _ if decodes(subclass.typeclass, param) => subclass.typeclass.decode(param) }: PartialFunction[String, T] - }.reduce(_ orElse _)(param) - - def decodes[T](tc: Decoder[T], s: String): Boolean = try { tc.decode(s); true } catch { case e: Exception => false } - - implicit val string: Decoder[String] = new Decoder[String] { def decode(str: String): String = str } - implicit val int: Decoder[Int] = new Decoder[Int] { def decode(str: String): Int = str.toInt } - implicit def generic[T]: Decoder[T] = macro Magnolia.generic[T] -} - -trait Decoder[T] { def decode(str: String): T } - -sealed trait Tree[+T] -case class Leaf[+L](value: L) extends Tree[L] -case class Branch[+B](left: Tree[B], right: Tree[B]) extends Tree[B] - -sealed trait Entity - -case class Company(name: String) extends Entity -case class Person(name: String, age: Int) extends Entity -case class Address(line1: String, occupant: Person) - - - -sealed trait Alphabet - -case class Greek(άλφα: Letter, βήτα: Letter, γάμα: Letter, δέλτα: Letter, έψιλον: Letter, ζήτα: Letter, ήτα: Letter, θήτα: Letter) extends Alphabet -case class Cyrillic(б: Letter, в: Letter, г: Letter, д: Letter, ж: Letter, з: Letter) extends Alphabet -case class Latin(a: Letter, b: Letter, c: Letter, d: Letter, e: Letter, f: Letter, g: Letter, h: Letter, i: Letter, j: Letter, k: Letter, l: Letter, m: Letter) extends Alphabet - -case class Letter(name: String, phonetic: String) -case class Country(name: String, language: Language, leader: Person) -case class Language(name: String, code: String, alphabet: Alphabet) -//case class Person(name: String, dateOfBirth: Date) -case class Date(year: Int, month: Month, day: Int) - -sealed trait Month -case object Jan extends Month -case object Feb extends Month -case object Mar extends Month -case object Apr extends Month -case object May extends Month -case object Jun extends Month -case object Jul extends Month -case object Aug extends Month -case object Sep extends Month -case object Oct extends Month -case object Nov extends Month -case object Dec extends Month - |