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• rojoma-json-v3_2.11
• 3.15.0
• source code
• ArbitraryValidString.scala

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com.rojoma.json.v3.testsupport.ArbitraryValidString.scala Maven / Gradle / Ivy

package com.rojoma.json.v3
package testsupport

import org.scalacheck.Arbitrary
import org.scalacheck.Gen

object ArbitraryValidString {
  // Strings with surrogate characters that make valid surrogate pairs
  implicit val ArbitraryValidString = Arbitrary[String] {
    val lowSurrogate = Gen.choose(Character.MIN_LOW_SURROGATE, Character.MAX_LOW_SURROGATE).map(_.toChar)

    val notLowSurrogate = Gen.frequency(
      (Character.MIN_LOW_SURROGATE - Char.MinValue, Gen.choose(Char.MinValue, Character.MIN_LOW_SURROGATE - 1)),
      (Char.MaxValue - Character.MAX_LOW_SURROGATE, Gen.choose(Character.MAX_LOW_SURROGATE + 1, Char.MaxValue))
    ).map(_.toChar)

    val validCodePoint = notLowSurrogate flatMap { a =>
      if(a.isHighSurrogate) lowSurrogate map { b => new String(Array(a, b)) }
      else a.toString
    }

    Gen.containerOf[List, String](validCodePoint) map (_.mkString)
  }
}