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Since ‘mergeError’ is only used to merge errors from alternative branches of parsing, longest match should be preferred.
134 lines
5.3 KiB
Haskell
134 lines
5.3 KiB
Haskell
-- -*- Mode: Haskell; -*-
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--
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-- QuickCheck tests for Megaparsec's parse errors.
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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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{-# OPTIONS -fno-warn-orphans #-}
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module Error (tests) where
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import Data.Bool (bool)
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import Data.List (isPrefixOf, isInfixOf)
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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 Pos ()
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import Text.Megaparsec.Error
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import Text.Megaparsec.Pos
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tests :: Test
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tests = testGroup "Parse errors"
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[ testProperty "extracting message string" prop_messageString
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, testProperty "creation of new error messages" prop_newErrorMessage
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, testProperty "messages are always well-formed" prop_wellFormedMessages
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, testProperty "copying of error positions" prop_parseErrorCopy
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, testProperty "setting of error position" prop_setErrorPos
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, testProperty "addition of error message" prop_addErrorMessage
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, testProperty "setting of error message" prop_setErrorMessage
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, testProperty "position of merged error" prop_mergeErrorPos
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, testProperty "messages of merged error" prop_mergeErrorMsgs
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, testProperty "position of error is visible" prop_visiblePos
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, testProperty "message components are visible" prop_visibleMsgs ]
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instance Arbitrary Message where
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arbitrary = ($) <$> elements constructors <*> arbitrary
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where constructors = [Unexpected, Expected, Message]
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instance Arbitrary ParseError where
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arbitrary = do
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ms <- listOf arbitrary
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pe <- oneof [ newErrorUnknown <$> arbitrary
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, newErrorMessage <$> arbitrary <*> arbitrary ]
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return $ foldr addErrorMessage pe ms
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prop_messageString :: Message -> Bool
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prop_messageString m@(Unexpected s) = s == messageString m
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prop_messageString m@(Expected s) = s == messageString m
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prop_messageString m@(Message s) = s == messageString m
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prop_newErrorMessage :: Message -> SourcePos -> Bool
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prop_newErrorMessage msg pos = added && errorPos new == pos
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where new = newErrorMessage msg pos
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added = errorMessages new == bool [msg] [] (badMessage msg)
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prop_wellFormedMessages :: ParseError -> Bool
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prop_wellFormedMessages err = wellFormed $ errorMessages err
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prop_parseErrorCopy :: ParseError -> Bool
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prop_parseErrorCopy err =
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foldr addErrorMessage (newErrorUnknown pos) msgs == err
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where pos = errorPos err
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msgs = errorMessages err
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prop_setErrorPos :: SourcePos -> ParseError -> Bool
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prop_setErrorPos pos err =
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errorPos new == pos && errorMessages new == errorMessages err
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where new = setErrorPos pos err
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prop_addErrorMessage :: Message -> ParseError -> Bool
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prop_addErrorMessage msg err =
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wellFormed msgs && (badMessage msg || added)
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where new = addErrorMessage msg err
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msgs = errorMessages new
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added = msg `elem` msgs && not (errorIsUnknown new)
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prop_setErrorMessage :: Message -> ParseError -> Bool
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prop_setErrorMessage msg err =
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wellFormed msgs && (badMessage msg || (added && unique))
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where new = setErrorMessage msg err
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msgs = errorMessages new
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added = msg `elem` msgs && not (errorIsUnknown new)
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unique = length (filter (== fromEnum msg) (fromEnum <$> msgs)) == 1
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prop_mergeErrorPos :: ParseError -> ParseError -> Bool
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prop_mergeErrorPos e1 e2 = errorPos (mergeError e1 e2) == max pos1 pos2
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where pos1 = errorPos e1
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pos2 = errorPos e2
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prop_mergeErrorMsgs :: ParseError -> ParseError -> Bool
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prop_mergeErrorMsgs e1 e2' = errorPos e1 /= errorPos e2 || wellFormed msgsm
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where e2 = setErrorPos (errorPos e1) e2'
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msgsm = errorMessages $ mergeError e1 e2
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prop_visiblePos :: ParseError -> Bool
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prop_visiblePos err = show (errorPos err) `isPrefixOf` show err
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prop_visibleMsgs :: ParseError -> Bool
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prop_visibleMsgs err = all (`isInfixOf` shown) (errorMessages err >>= f)
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where shown = show err
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f (Unexpected s) = ["unexpected", s]
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f (Expected s) = ["expecting", s]
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f (Message s) = [s]
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-- | @iwellFormed xs@ checks that list @xs@ is sorted and contains no
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-- duplicates and no empty messages.
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wellFormed :: [Message] -> Bool
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wellFormed xs = and (zipWith (<) xs (tail xs)) && not (any badMessage xs)
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