kantan.csv.laws.discipline.equality.scala Maven / Gradle / Ivy

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laws

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/*
 * Copyright 2016 Nicolas Rinaudo
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package kantan.csv.laws.discipline

import kantan.csv._
import org.scalacheck.Arbitrary
import org.scalacheck.Arbitrary.{arbitrary => arb}

object equality {
  def eq[A, B: Arbitrary](a1: B ⇒ A, a2: B ⇒ A)(f: (A, A) ⇒ Boolean): Boolean = {
    val samples = List.fill(100)(arb[B].sample).collect {
      case Some(a) ⇒ a
      case None ⇒ sys.error("Could not generate arbitrary values to compare two functions")
    }
    samples.forall(b ⇒ f(a1(b), a2(b)))
  }

  def cellDecoder[A](c1: CellDecoder[A], c2: CellDecoder[A])(f: (DecodeResult[A], DecodeResult[A]) ⇒ Boolean): Boolean =
    eq(c1.decode, c2.decode)(f)

  def cellEncoder[A: Arbitrary](c1: CellEncoder[A], c2: CellEncoder[A]): Boolean =
    eq(c1.encode, c2.encode)(_ == _)

  def rowDecoder[A](c1: RowDecoder[A], c2: RowDecoder[A])(f: (DecodeResult[A], DecodeResult[A]) ⇒ Boolean): Boolean =
    eq(c1.decode, c2.decode)(f)

  def rowEncoder[A: Arbitrary](c1: RowEncoder[A], c2: RowEncoder[A]): Boolean =
    eq(c1.encode, c2.encode)(_ == _)
}