https://github.com/petitviolet/scala-acase
annotations let a class as case class
https://github.com/petitviolet/scala-acase
metaprogramming scala scalameta
Last synced: 7 months ago
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annotations let a class as case class
- Host: GitHub
- URL: https://github.com/petitviolet/scala-acase
- Owner: petitviolet
- Created: 2017-02-26T08:54:54.000Z (over 8 years ago)
- Default Branch: master
- Last Pushed: 2018-08-06T04:49:11.000Z (about 7 years ago)
- Last Synced: 2023-07-05T12:09:15.428Z (over 2 years ago)
- Topics: metaprogramming, scala, scalameta
- Language: Scala
- Size: 23.4 KB
- Stars: 5
- Watchers: 3
- Forks: 0
- Open Issues: 1
-
Metadata Files:
- Readme: README.md
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README
# @Case annotation let a class to case class
[](https://maven-badges.herokuapp.com/maven-central/net.petitviolet/acase_2.12)
This repository provides a utility annotation.
# @Case annotation
`@Case` is an annotation to insert whole methods as a case class to instance itself and companion object.
Before expansion.
```scala
@Case class CaseApp(val n: Int, val s: String)
```
After compilation and expansion.
```scala
class CaseApp(val n: Int, val s: String) {
override def toString: String = {
"CaseApp" + "(" + ("n" + ": " + n.toString + ", " + "s" + ": " + s.toString) + ")"
}
override def equals(obj: Any): Boolean = {
if (!obj.isInstanceOf[CaseApp]) false else {
val other = obj.asInstanceOf[CaseApp]
this.n == other.n && this.s == other.s
}
}
def copy(n = this.n, s = this.s) = new CaseApp(n, s)
}
object CaseApp {
def unapply(arg: CaseApp): Option[(Int, String)] = {
Some((arg.n, arg.s))
}
def apply(n: Int, s: String): CaseApp = new CaseApp(n, s)
}
```
# setup
in build.sbt
```scala
lazy val metaMacroSettings: Seq[Def.Setting[_]] = Seq(
resolvers += Resolver.sonatypeRepo("releases"),
resolvers += Resolver.bintrayIvyRepo("scalameta", "maven"),
addCompilerPlugin("org.scalameta" % "paradise" % "3.0.0-M7" cross CrossVersion.full),
// if you need
// libraryDependencies ++= Seq(
// "org.scala-lang" % "scala-reflect" % scalaVersion.value % "provided",
// "org.scala-lang" % "scala-compiler" % scalaVersion.value % "provided"
// ),
scalacOptions ++= Seq(
"-Xplugin-require:macroparadise",
// "-Ymacro-debug-lite" // for debug
)
)
project.settings(
metaMacroSettings,
libraryDependencies += "net.petitviolet" %% "acase" % ""
)
```
can use with Scala2.11 and Scala2.12.
# each annotations as a case class
- @Apply
- @Unapply
- @ToString
- @Equals
- @Copy