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paulp/case-classes.scala

Created April 25, 2014 21:19
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Revisions

  1. paulp created this gist Apr 25, 2014.
    59 changes: 59 additions & 0 deletions case-classes.scala
    View file
    Original file line number Diff line number Diff line change
    @@ -0,0 +1,59 @@
    // Quasiquoted excerpt

    def cdef = q"""
    class $ClassName[..$classTypeParams](..$primaryParams) extends ..$classParents {
    ..$primaryAccessors

    def get = this
    def isEmpty = ${quasi.isEmpty}
    def copy(..$primaryWithDefaults) = $ObjectName(..$primaryNames)

    override def productPrefix: String = $ClassNameString
    override def productIterator: $primaryIteratorType = Iterator(..$primaryNames)
    override def canEqual(that: Any): Boolean = ${CanEqualLogic("that")}
    override def toString(): String = $ToStringLogic
    override def hashCode(): Int = $HashCodeLogic
    override def equals(that: Any): Boolean = ${EqualsLogic("that")}
    }"""

    def mdef = q"""
    object $ObjectName extends $objectParent {
    private[this] val $NoClassName: $ClassType = ${quasi.createEmpty()}
    override final def toString = $ClassNameString
    def apply[..$classTypeParams](..$primaryParams): $ClassName = $newClassType
    def unapply[..$classTypeParams](x: $ClassType): $ClassType = if (x eq null) $NoClassName else x
    private def readResolve(): Object = $ObjectName
    }"""


    // Generating
    QuasiCaseClass("Rational").vparam[Int]("n").vparam[Int]("d").result

    class Rational(val n: Int, val d: Int) extends AnyRef with Product2[Int, Int] {
    def _1 = n;
    def _2 = d;
    def get = this;
    def isEmpty = d == 0;
    def copy(n: Int = n, d: Int = d) = Rational(n, d);
    override def productPrefix: String = "Rational";
    override def productIterator: Iterator[Int] = Iterator(n, d);
    override def canEqual(that: Any): Boolean = that.isInstanceOf[Rational];
    override def toString(): String = List(n, d).mkString("Rational".+("("), ", ", ")");
    override def hashCode(): Int = {
    var acc: Int = -889275714;
    scala.runtime.Statics.mix(acc, n);
    scala.runtime.Statics.mix(acc, d);
    scala.runtime.Statics.finalizeHash(acc, 2)
    };
    override def equals(that: Any): Boolean = this.eq(that.asInstanceOf[AnyRef]).||(true)
    }
    object Rational extends _root_.scala.Function2[Int, Int, Rational] {
    private[this] val NoRational: Rational = new Rational(0, 0);
    final override def toString = "Rational";
    def apply(n: Int, d: Int): Rational = new Rational(n, d);
    def unapply(x: Rational): Rational = if (x.eq(null))
    NoRational
    else
    x;
    private def readResolve(): Object = Rational
    }