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Luka Jacobowitz
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Oct 4, 2017
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66 changes: 19 additions & 47 deletions
66
kernel-laws/src/main/scala/cats/kernel/laws/HashLaws.scala
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,55 +1,27 @@ | ||
| package cats.kernel | ||
| package laws | ||
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| import org.typelevel.discipline._ | ||
| import org.scalacheck._ | ||
| import org.scalacheck.Prop._ | ||
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| import scala.util.hashing._ | ||
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| object HashLaws { | ||
| def apply[A : Eq : Arbitrary]: HashLaws[A] = | ||
| new HashLaws[A] { | ||
| def Equ = implicitly[Eq[A]] | ||
| def Arb = implicitly[Arbitrary[A]] | ||
| } | ||
| } | ||
| trait HashLaws[A] extends EqLaws[A] { | ||
| override implicit def E: Hash[A] | ||
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| def hashCompatibility(x: A, y: A): IsEq[Boolean] = | ||
| (!E.eqv(x, y) || (Hash.hash(x) == Hash.hash(y))) <-> true | ||
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| /** | ||
| * @author Tongfei Chen | ||
| */ | ||
| trait HashLaws[A] extends Laws { | ||
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| implicit def Equ: Eq[A] | ||
| implicit def Arb: Arbitrary[A] | ||
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| def hash(implicit A: Hash[A]): HashProperties = new HashProperties( | ||
| name = "hash", | ||
| parent = None, | ||
| "compatibility-hash" -> forAll { (x: A, y: A) => | ||
| !(A.eqv(x, y)) || (Hash.hash(x) == Hash.hash(y)) | ||
| } | ||
| ) | ||
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| def sameAsUniversalHash(implicit A: Hash[A]): HashProperties = new HashProperties( | ||
| name = "sameAsUniversalHash", | ||
| parent = None, | ||
| "same-as-universal-hash" -> forAll { (x: A, y: A) => | ||
| (A.hash(x) == x.hashCode) && (Hash.fromUniversalHashCode[A].hash(x) == x.hashCode()) && | ||
| (A.eqv(x, y) == Hash.fromUniversalHashCode[A].eqv(x, y)) | ||
| } | ||
| ) | ||
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| def sameAsScalaHashing(implicit catsHash: Hash[A], scalaHashing: Hashing[A]): HashProperties = new HashProperties( | ||
| name = "sameAsScalaHashing", | ||
| parent = None, | ||
| "same-as-scala-hashing" -> forAll { (x: A, y: A) => | ||
| (catsHash.hash(x) == Hash.fromHashing(scalaHashing).hash(x)) && | ||
| (catsHash.eqv(x, y) == Hash.fromHashing(scalaHashing).eqv(x, y)) | ||
| } | ||
| ) | ||
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| class HashProperties(name: String, parent: Option[RuleSet], props: (String, Prop)*) | ||
| extends DefaultRuleSet(name, parent, props: _*) | ||
| def sameAsUniversalHash (x: A, y: A): IsEq[Boolean] = | ||
| ((E.hash(x) == x.hashCode) && (Hash.fromUniversalHashCode[A].hash(x) == x.hashCode()) && | ||
| (E.eqv(x, y) == Hash.fromUniversalHashCode[A].eqv(x, y))) <-> true | ||
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| def sameAsScalaHashing(x: A, y: A, scalaHashing: Hashing[A]): IsEq[Boolean] = | ||
| ((E.hash(x) == Hash.fromHashing(scalaHashing).hash(x)) && | ||
| (E.eqv(x, y) == Hash.fromHashing(scalaHashing).eqv(x, y))) <-> true | ||
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| } | ||
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| object HashLaws { | ||
| def apply[A](implicit ev: Hash[A]): HashLaws[A] = | ||
| new HashLaws[A] { def E: Hash[A] = ev } | ||
| } |
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30 changes: 30 additions & 0 deletions
30
kernel-laws/src/main/scala/cats/kernel/laws/discipline/HashTests.scala
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,30 @@ | ||
| package cats | ||
| package kernel | ||
| package laws | ||
| package discipline | ||
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| import cats.kernel.instances.boolean._ | ||
| import org.scalacheck.Arbitrary | ||
| import org.scalacheck.Prop.forAll | ||
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| import scala.util.hashing.Hashing | ||
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| trait HashTests[A] extends EqLawTests[A] { | ||
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| def laws: HashLaws[A] | ||
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| def hash(implicit arbA: Arbitrary[A], arbF: Arbitrary[A => A], eqA: Eq[A], hashA: Hashing[A]): RuleSet = | ||
| new DefaultRuleSet( | ||
| "hash", | ||
| Some(eqv), | ||
| "hash compatibility" -> forAll(laws.hashCompatibility _), | ||
| "same as universal hash" -> forAll(laws.sameAsUniversalHash _), | ||
| "same as universal hash" -> forAll((x: A, y: A) => laws.sameAsScalaHashing(x, y, hashA)) | ||
| ) | ||
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| } | ||
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| object HashTests { | ||
| def apply[A: Hash]: HashTests[A] = | ||
| new HashTests[A] { def laws: HashLaws[A] = HashLaws[A] } | ||
| } |
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