pathy.scalacheck.package.scala Maven / Gradle / Ivy
/*
* Copyright 2014–2017 SlamData Inc.
*
* 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 pathy
import slamdata.Predef._
import Path._
import org.scalacheck.Gen
package object scalacheck {
type AbsFileOf[A] = PathOf[Abs,File,Sandboxed,A]
type RelFileOf[A] = PathOf[Rel,File,Sandboxed,A]
type AbsDirOf[A] = PathOf[Abs,Dir,Sandboxed,A]
type RelDirOf[A] = PathOf[Rel,Dir,Sandboxed,A]
/** Generator that distributes the available size to two component generators,
* and then combines the results. Can be used to generate nested structures
* where the aggregate size of component/leaf elements is effectively controlled
* by the size parameter.
*/
def sizeDistributed[A, B, C](ga: Gen[A], gb: Gen[B])(f: (A, B) => C): Gen[C] =
for {
n <- Gen.size
x <- Gen.choose(0, n)
a <- Gen.resize(x, ga)
b <- Gen.resize(n - x, gb)
} yield f(a, b)
/** Generator for lists of non-atomic components, where the size parameter is
* spread across all the generated elements so that the aggregate size of
* component/leaf elements is effectively controlled by the size parameter.
* No element is ever generated with a size parameter of less than 1, and
* each "cons cell" consumes one unit of size.
*/
def sizeDistributedListOfNonEmpty[A](g: Gen[A]): Gen[List[A]] =
Gen.size.flatMap { n =>
if (n < 1) Gen.const(Nil)
else if (n < 3) g.map(_ :: Nil)
else
for {
l <- Gen.choose(1, n)
r = n - l - 1
h <- Gen.resize(l, g)
t <- Gen.resize(r, sizeDistributedListOfNonEmpty(g))
} yield (h :: t)
}
val MinPrintableASCII: Char = '\u0020'
val MaxPrintableASCII: Char = '\u007e'
}