CommandOptions.hs

{-# LANGUAGE CPP #-}
{-# OPTIONS_GHC -fno-warn-orphans #-}
{-
	Copyright (C) 2013-2015 Dr. Alistair Ward

	This program is free software: you can redistribute it and/or modify
	it under the terms of the GNU General Public License as published by
	the Free Software Foundation, either version 3 of the License, or
	(at your option) any later version.

	This program is distributed in the hope that it will be useful,
	but WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
	GNU General Public License for more details.

	You should have received a copy of the GNU General Public License
	along with this program.  If not, see <http://www.gnu.org/licenses/>.
-}
{- |
 [@AUTHOR@]	Dr. Alistair Ward

 [@DESCRIPTION@]	Implements 'Test.QuickCheck.Arbitrary' for 'Data.CommandOptions.CommandOptions'.
-}

module FishFood.Test.QuickCheck.Data.CommandOptions(
-- * Types
-- ** Type-synonyms
	CommandOptions
) where

import qualified	Test.QuickCheck
import qualified	FishFood.Data.CommandOptions	as Data.CommandOptions
import			FishFood.Test.QuickCheck.Data.Verbosity()

#if !MIN_VERSION_base(4,8,0)
import	Control.Applicative((<$>), (<*>))
#endif

instance (
	Enum				ratio,
	Fractional			ratio,
	Ord				ratio,
	Show				ratio,
	Test.QuickCheck.Arbitrary	ratio
 ) => Test.QuickCheck.Arbitrary (Data.CommandOptions.CommandOptions ratio)	where
	arbitrary	= do
		deriveProbabilityMassFunction	<- Test.QuickCheck.arbitrary

		Data.CommandOptions.mkCommandOptions <$> (
			either (
				Left . (succ . abs <$> {-into Maybe-monad-})
			) (
				Right . (+ recip 1000000) . succ . abs
			) <$> Test.QuickCheck.arbitrary {-binSizeDelta-}
		 ) <*> return {-to Gen-monad-} deriveProbabilityMassFunction <*> (
			max (
				if deriveProbabilityMassFunction then 1 else 0
			) . (
				`mod` 15 {-maximum permissible-}
			) <$> Test.QuickCheck.arbitrary {-nDecimalDigits-}
		 ) <*> Test.QuickCheck.arbitrary {-verbosity-}

-- | Defines a concrete type for testing.
type CommandOptions	= Data.CommandOptions.CommandOptions Double