cryptol-2.4.0: Cryptol: The Language of Cryptography

Cryptol.Testing.Random

Description

This module generates random values for Cryptol types.

Synopsis

# Documentation

type Gen g = Integer -> g -> (Value, g) Source #

Arguments

 :: RandomGen g => Value Function under test -> [Gen g] Argument generators -> Integer Size -> g -> IO (TestResult, g)

Apply a testable value to some randomly-generated arguments. Returns Nothing if the function returned True, or Just counterexample if it returned False.

Please note that this function assumes that the generators match the supplied value, otherwise we'll panic.

testableType :: RandomGen g => Type -> Maybe [Gen g] Source #

Given a (function) type, compute generators for the function's arguments. Currently we do not support polymorphic functions. In principle, we could apply these to random types, and test the results.

randomValue :: RandomGen g => Type -> Maybe (Gen g) Source #

A generator for values of the given type. This fails if we are given a type that lacks a suitable random value generator.

randomBit :: RandomGen g => Gen g Source #

Generate a random bit value.

randomWord :: RandomGen g => Integer -> Gen g Source #

Generate a random word of the given length (i.e., a value of type [w]) The size parameter is assumed to vary between 1 and 100, and we use it to generate smaller numbers first.

randomStream :: RandomGen g => Gen g -> Gen g Source #

Generate a random infinite stream value.

randomSequence :: RandomGen g => Integer -> Gen g -> Gen g Source #

Generate a random sequence. Generally, this should be used for sequences other than bits. For sequences of bits use "randomWord". The difference is mostly about how the results will be displayed.

randomTuple :: RandomGen g => [Gen g] -> Gen g Source #

Generate a random tuple value.

randomRecord :: RandomGen g => [(Ident, Gen g)] -> Gen g Source #

Generate a random record value.