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104 lines
3.7 KiB
Haskell
104 lines
3.7 KiB
Haskell
-- -*- Mode: Haskell; -*-
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--
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-- QuickCheck tests for Megaparsec's permutation phrases parsers.
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--
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-- Copyright © 2015 Megaparsec contributors
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--
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-- Redistribution and use in source and binary forms, with or without
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-- modification, are permitted provided that the following conditions are
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-- met:
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--
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-- * Redistributions of source code must retain the above copyright notice,
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-- this list of conditions and the following disclaimer.
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--
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-- * Redistributions in binary form must reproduce the above copyright
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-- notice, this list of conditions and the following disclaimer in the
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-- documentation and/or other materials provided with the distribution.
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--
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-- This software is provided by the copyright holders "as is" and any
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-- express or implied warranties, including, but not limited to, the implied
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-- warranties of merchantability and fitness for a particular purpose are
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-- disclaimed. In no event shall the copyright holders be liable for any
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-- direct, indirect, incidental, special, exemplary, or consequential
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-- damages (including, but not limited to, procurement of substitute goods
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-- or services; loss of use, data, or profits; or business interruption)
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-- however caused and on any theory of liability, whether in contract,
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-- strict liability, or tort (including negligence or otherwise) arising in
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-- any way out of the use of this software, even if advised of the
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-- possibility of such damage.
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module Perm (tests) where
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import Control.Applicative
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#if MIN_VERSION_base(4,7,0)
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import Data.Bool (bool)
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#endif
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import Data.List (nub, elemIndices)
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import Test.Framework
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import Test.Framework.Providers.QuickCheck2 (testProperty)
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import Test.QuickCheck
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import Text.Megaparsec.Char
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import Text.Megaparsec.Perm
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import Util
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#if !MIN_VERSION_base(4,7,0)
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bool :: a -> a -> Bool -> a
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bool f _ False = f
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bool _ t True = t
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#endif
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tests :: Test
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tests = testGroup "Permutation phrases parsers"
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[ testProperty "permutation parser pure" prop_pure
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, testProperty "permutation test 0" prop_perm_0 ]
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data CharRows = CharRows
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{ getChars :: (Char, Char, Char)
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, getInput :: String }
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deriving (Eq, Show)
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instance Arbitrary CharRows where
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arbitrary = do
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chars@(a,b,c) <- arbitrary `suchThat` different
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an <- arbitrary
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bn <- arbitrary
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cn <- arbitrary
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input <- concat <$> shuffle
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[ replicate an a
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, replicate bn b
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, replicate cn c]
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return $ CharRows chars input
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where different (a,b,c) = let l = [a,b,c] in l == nub l
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prop_pure :: Integer -> Property
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prop_pure n = makePermParser p /=\ n
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where p = id <$?> (succ n, pure n)
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prop_perm_0 :: String -> Char -> CharRows -> Property
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prop_perm_0 a' c' v = checkParser (makePermParser p) r s
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where (a,b,c) = getChars v
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p = (,,) <$?> (a', some (char a))
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<||> char b
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<|?> (c', char c)
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r | length bis > 1 && (length cis <= 1 || head bis < head cis) =
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posErr (bis !! 1) s $ [uneCh b, exEof] ++
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[exCh a | a `notElem` preb] ++
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[exCh c | c `notElem` preb]
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| length cis > 1 =
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posErr (cis !! 1) s $ [uneCh c] ++
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[exCh a | a `notElem` prec] ++
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[bool (exCh b) exEof (b `elem` prec)]
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| b `notElem` s = posErr (length s) s $ [uneEof, exCh b] ++
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[exCh a | a `notElem` s || last s == a] ++
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[exCh c | c `notElem` s]
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| otherwise = Right ( bool a' (filter (== a) s) (a `elem` s)
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, b
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, bool c' c (c `elem` s) )
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bis = elemIndices b s
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preb = take (bis !! 1) s
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cis = elemIndices c s
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prec = take (cis !! 1) s
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s = getInput v
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