eu.timepit.refined.boolean.scala Maven / Gradle / Ivy
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package eu.timepit.refined
import eu.timepit.refined.api._
import eu.timepit.refined.api.Inference.==>
import eu.timepit.refined.boolean._
import eu.timepit.refined.internal.Resources
import shapeless.{::, HList, HNil}
import shapeless.ops.hlist.ToList
/** Module for logical predicates. */
object boolean extends BooleanValidate with BooleanInference0 {
/** Constant predicate that is always `true`. */
final case class True()
/** Constant predicate that is always `false`. */
final case class False()
/** Negation of the predicate `P`. */
final case class Not[P](p: P)
/** Conjunction of the predicates `A` and `B`. */
final case class And[A, B](a: A, b: B)
/** Disjunction of the predicates `A` and `B`. */
final case class Or[A, B](a: A, b: B)
/** Exclusive disjunction of the predicates `A` and `B`. */
final case class Xor[A, B](a: A, b: B)
/** Conjunction of all predicates in `PS`. */
final case class AllOf[PS](ps: PS)
/** Disjunction of all predicates in `PS`. */
final case class AnyOf[PS](ps: PS)
/** Exclusive disjunction of all predicates in `PS`. */
final case class OneOf[PS](ps: PS)
/** Negated conjunction of the predicates `A` and `B`. */
type Nand[A, B] = Not[A And B]
/** Negated disjunction of the predicates `A` and `B`. */
type Nor[A, B] = Not[A Or B]
}
private[refined] trait BooleanValidate {
implicit def trueValidate[T]: Validate.Plain[T, True] =
Validate.alwaysPassed(True())
implicit def falseValidate[T]: Validate.Plain[T, False] =
Validate.alwaysFailed(False())
implicit def notValidate[T, P, R](
implicit v: Validate.Aux[T, P, R]): Validate.Aux[T, Not[P], Not[v.Res]] =
new Validate[T, Not[P]] {
override type R = Not[v.Res]
override def validate(t: T): Res = {
val r = v.validate(t)
Result.fromBoolean(r.isFailed, Not(r))
}
override def showExpr(t: T): String =
s"!${v.showExpr(t)}"
override def showResult(t: T, r: Res): String = {
val expr = v.showExpr(t)
val rp = r.detail.p
rp match {
case Passed(_) => Resources.showResultNotInnerPassed(expr)
case Failed(_) => Resources.showResultNotInnerFailed(expr)
}
}
}
implicit def andValidate[T, A, RA, B, RB](
implicit va: Validate.Aux[T, A, RA],
vb: Validate.Aux[T, B, RB]
): Validate.Aux[T, A And B, va.Res And vb.Res] =
new Validate[T, A And B] {
override type R = va.Res And vb.Res
override def validate(t: T): Res = {
val (ra, rb) = (va.validate(t), vb.validate(t))
Result.fromBoolean(ra.isPassed && rb.isPassed, And(ra, rb))
}
override def showExpr(t: T): String =
s"(${va.showExpr(t)} && ${vb.showExpr(t)})"
override def showResult(t: T, r: Res): String = {
val expr = showExpr(t)
val (ra, rb) = (r.detail.a, r.detail.b)
(ra, rb) match {
case (Passed(_), Passed(_)) =>
Resources.showResultAndBothPassed(expr)
case (Passed(_), Failed(_)) =>
Resources.showResultAndRightFailed(expr, vb.showResult(t, rb))
case (Failed(_), Passed(_)) =>
Resources.showResultAndLeftFailed(expr, va.showResult(t, ra))
case (Failed(_), Failed(_)) =>
Resources.showResultAndBothFailed(expr, va.showResult(t, ra), vb.showResult(t, rb))
}
}
}
implicit def orValidate[T, A, RA, B, RB](
implicit va: Validate.Aux[T, A, RA],
vb: Validate.Aux[T, B, RB]
): Validate.Aux[T, A Or B, va.Res Or vb.Res] =
new Validate[T, A Or B] {
override type R = va.Res Or vb.Res
override def validate(t: T): Res = {
val (ra, rb) = (va.validate(t), vb.validate(t))
Result.fromBoolean(ra.isPassed || rb.isPassed, Or(ra, rb))
}
override def showExpr(t: T): String =
s"(${va.showExpr(t)} || ${vb.showExpr(t)})"
override def showResult(t: T, r: Res): String = {
val expr = showExpr(t)
val (ra, rb) = (r.detail.a, r.detail.b)
(ra, rb) match {
case (Passed(_), Passed(_)) =>
Resources.showResultOrBothPassed(expr)
case (Passed(_), Failed(_)) =>
Resources.showResultOrLeftPassed(expr)
case (Failed(_), Passed(_)) =>
Resources.showResultOrRightPassed(expr)
case (Failed(_), Failed(_)) =>
Resources.showResultOrBothFailed(expr, va.showResult(t, ra), vb.showResult(t, rb))
}
}
}
implicit def xorValidate[T, A, RA, B, RB](
implicit va: Validate.Aux[T, A, RA],
vb: Validate.Aux[T, B, RB]
): Validate.Aux[T, A Xor B, va.Res Xor vb.Res] =
new Validate[T, A Xor B] {
override type R = va.Res Xor vb.Res
override def validate(t: T): Res = {
val (ra, rb) = (va.validate(t), vb.validate(t))
Result.fromBoolean(ra.isPassed ^ rb.isPassed, Xor(ra, rb))
}
override def showExpr(t: T): String =
s"(${va.showExpr(t)} ^ ${vb.showExpr(t)})"
override def showResult(t: T, r: Res): String = {
val expr = showExpr(t)
val (ra, rb) = (r.detail.a, r.detail.b)
(ra, rb) match {
case (Passed(_), Passed(_)) =>
Resources.showResultOrBothPassed(expr)
case (Passed(_), Failed(_)) =>
Resources.showResultOrLeftPassed(expr)
case (Failed(_), Passed(_)) =>
Resources.showResultOrRightPassed(expr)
case (Failed(_), Failed(_)) =>
Resources.showResultOrBothFailed(expr, va.showResult(t, ra), vb.showResult(t, rb))
}
}
}
implicit def allOfHNilValidate[T]: Validate.Plain[T, AllOf[HNil]] =
Validate.alwaysPassed(AllOf(HList()))
implicit def allOfHConsValidate[T, PH, RH, PT <: HList, RT <: HList](
implicit vh: Validate.Aux[T, PH, RH],
vt: Validate.Aux[T, AllOf[PT], AllOf[RT]]
): Validate.Aux[T, AllOf[PH :: PT], AllOf[vh.Res :: RT]] =
new Validate[T, AllOf[PH :: PT]] {
override type R = AllOf[vh.Res :: RT]
override def validate(t: T): Res = {
val rh = vh.validate(t)
val rt = vt.validate(t)
Result.fromBoolean(rh.isPassed && rt.isPassed, AllOf(rh :: rt.detail.ps))
}
override def showExpr(t: T): String =
accumulateShowExpr(t).mkString("(", " && ", ")")
override def accumulateShowExpr(t: T): List[String] =
vh.showExpr(t) :: vt.accumulateShowExpr(t)
}
implicit def anyOfHNilValidate[T]: Validate.Plain[T, AnyOf[HNil]] =
Validate.alwaysFailed(AnyOf(HList()))
implicit def anyOfHConsValidate[T, PH, RH, PT <: HList, RT <: HList](
implicit vh: Validate.Aux[T, PH, RH],
vt: Validate.Aux[T, AnyOf[PT], AnyOf[RT]]
): Validate.Aux[T, AnyOf[PH :: PT], AnyOf[vh.Res :: RT]] =
new Validate[T, AnyOf[PH :: PT]] {
override type R = AnyOf[vh.Res :: RT]
override def validate(t: T): Res = {
val rh = vh.validate(t)
val rt = vt.validate(t)
Result.fromBoolean(rh.isPassed || rt.isPassed, AnyOf(rh :: rt.detail.ps))
}
override def showExpr(t: T): String =
accumulateShowExpr(t).mkString("(", " || ", ")")
override def accumulateShowExpr(t: T): List[String] =
vh.showExpr(t) :: vt.accumulateShowExpr(t)
}
implicit def oneOfHNilValidate[T]: Validate.Plain[T, OneOf[HNil]] =
Validate.alwaysFailed(OneOf(HList()))
implicit def oneOfHConsValidate[T, PH, RH, PT <: HList, RT <: HList](
implicit vh: Validate.Aux[T, PH, RH],
vt: Validate.Aux[T, OneOf[PT], OneOf[RT]],
toList: ToList[RT, Result[_]]
): Validate.Aux[T, OneOf[PH :: PT], OneOf[vh.Res :: RT]] =
new Validate[T, OneOf[PH :: PT]] {
override type R = OneOf[vh.Res :: RT]
override def validate(t: T): Res = {
val rh = vh.validate(t)
val rt = vt.validate(t).detail.ps
val passed = (rh :: toList(rt)).count(_.isPassed) == 1
Result.fromBoolean(passed, OneOf(rh :: rt))
}
override def showExpr(t: T): String =
accumulateShowExpr(t).mkString("oneOf(", ", ", ")")
override def accumulateShowExpr(t: T): List[String] =
vh.showExpr(t) :: vt.accumulateShowExpr(t)
}
}
private[refined] trait BooleanInference0 extends BooleanInference1 {
implicit def minimalTautology[A]: A ==> A =
Inference.alwaysValid("minimalTautology")
implicit def doubleNegationElimination[A, B](implicit p1: A ==> B): Not[Not[A]] ==> B =
p1.adapt("doubleNegationElimination(%s)")
implicit def doubleNegationIntroduction[A, B](implicit p1: A ==> B): A ==> Not[Not[B]] =
p1.adapt("doubleNegationIntroduction(%s)")
implicit def conjunctionAssociativity[A, B, C]: ((A And B) And C) ==> (A And (B And C)) =
Inference.alwaysValid("conjunctionAssociativity")
implicit def conjunctionCommutativity[A, B]: (A And B) ==> (B And A) =
Inference.alwaysValid("conjunctionCommutativity")
implicit def conjunctionEliminationR[A, B, C](implicit p1: B ==> C): (A And B) ==> C =
p1.adapt("conjunctionEliminationR(%s)")
implicit def disjunctionAssociativity[A, B, C]: ((A Or B) Or C) ==> (A Or (B Or C)) =
Inference.alwaysValid("disjunctionAssociativity")
implicit def disjunctionCommutativity[A, B]: (A Or B) ==> (B Or A) =
Inference.alwaysValid("disjunctionCommutativity")
implicit def disjunctionIntroductionL[A, B]: A ==> (A Or B) =
Inference.alwaysValid("disjunctionIntroductionL")
implicit def disjunctionIntroductionR[A, B]: B ==> (A Or B) =
Inference.alwaysValid("disjunctionIntroductionR")
implicit def deMorgansLaw1[A, B]: Not[A And B] ==> (Not[A] Or Not[B]) =
Inference.alwaysValid("deMorgansLaw1")
implicit def deMorgansLaw2[A, B]: Not[A Or B] ==> (Not[A] And Not[B]) =
Inference.alwaysValid("deMorgansLaw2")
implicit def xorCommutativity[A, B]: (A Xor B) ==> (B Xor A) =
Inference.alwaysValid("xorCommutativity")
implicit def nandCommutativity[A, B]: (A Nand B) ==> (B Nand A) =
Inference.alwaysValid("nandCommutativity")
implicit def norCommutativity[A, B]: (A Nor B) ==> (B Nor A) =
Inference.alwaysValid("norCommutativity")
}
private[refined] trait BooleanInference1 extends BooleanInference2 {
implicit def modusTollens[A, B](implicit p1: A ==> B): Not[B] ==> Not[A] =
p1.adapt("modusTollens(%s)")
}
private[refined] trait BooleanInference2 {
implicit def conjunctionEliminationL[A, B, C](implicit p1: A ==> C): (A And B) ==> C =
p1.adapt("conjunctionEliminationL(%s)")
implicit def hypotheticalSyllogism[A, B, C](implicit p1: A ==> B, p2: B ==> C): A ==> C =
Inference.combine(p1, p2, "hypotheticalSyllogism(%s, %s)")
}
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