mirror of
https://github.com/mrkkrp/megaparsec.git
synced 2024-12-18 13:51:58 +03:00
126 lines
4.8 KiB
Haskell
126 lines
4.8 KiB
Haskell
--
|
||
-- Tests for Megaparsec's permutation phrases parsers.
|
||
--
|
||
-- Copyright © 2015–2016 Megaparsec contributors
|
||
--
|
||
-- Redistribution and use in source and binary forms, with or without
|
||
-- modification, are permitted provided that the following conditions are
|
||
-- met:
|
||
--
|
||
-- * Redistributions of source code must retain the above copyright notice,
|
||
-- this list of conditions and the following disclaimer.
|
||
--
|
||
-- * Redistributions in binary form must reproduce the above copyright
|
||
-- notice, this list of conditions and the following disclaimer in the
|
||
-- documentation and/or other materials provided with the distribution.
|
||
--
|
||
-- THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS “AS IS” AND ANY
|
||
-- EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
|
||
-- WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
|
||
-- DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY
|
||
-- DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
||
-- DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
||
-- OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
||
-- HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
|
||
-- STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
|
||
-- ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
||
-- POSSIBILITY OF SUCH DAMAGE.
|
||
|
||
{-# LANGUAGE MultiWayIf #-}
|
||
|
||
module Text.Megaparsec.PermSpec (spec) where
|
||
|
||
import Control.Applicative
|
||
import Data.List (nub, elemIndices)
|
||
import Data.Monoid
|
||
import Test.Hspec
|
||
import Test.Hspec.Megaparsec
|
||
import Test.Hspec.Megaparsec.AdHoc
|
||
import Test.QuickCheck
|
||
import Text.Megaparsec.Char
|
||
import Text.Megaparsec.Lexer (integer)
|
||
import Text.Megaparsec.Perm
|
||
|
||
data CharRows = CharRows
|
||
{ getChars :: (Char, Char, Char)
|
||
, getInput :: String }
|
||
deriving (Eq, Show)
|
||
|
||
instance Arbitrary CharRows where
|
||
arbitrary = do
|
||
chars@(a,b,c) <- arbitrary `suchThat` different
|
||
an <- arbitrary
|
||
bn <- arbitrary
|
||
cn <- arbitrary
|
||
input <- concat <$> shuffle
|
||
[ replicate an a
|
||
, replicate bn b
|
||
, replicate cn c]
|
||
return $ CharRows chars input
|
||
where different (a,b,c) = let l = [a,b,c] in l == nub l
|
||
|
||
spec :: Spec
|
||
spec = do
|
||
|
||
describe "(<$$>)" $ do
|
||
context "when supplied parser succeeds" $
|
||
it "returns value returned by the parser" $
|
||
property $ \n -> do
|
||
let p = makePermParser (succ <$$> pure (n :: Integer))
|
||
prs p "" `shouldParse` succ n
|
||
context "when supplied parser fails" $
|
||
it "signals correct parse error" $ do
|
||
let p = makePermParser (succ <$$> integer)
|
||
prs p "" `shouldFailWith` err posI (ueof <> elabel "integer")
|
||
|
||
describe "(<$?>)" $ do
|
||
context "when supplied parser succeeds" $
|
||
it "returns value returned by the parser" $
|
||
property $ \n m -> do
|
||
let p = makePermParser (succ <$?> (n :: Integer, pure (m :: Integer)))
|
||
prs p "" `shouldParse` succ m
|
||
context "when supplied parser fails" $
|
||
it "returns the default value" $
|
||
property $ \n -> do
|
||
let p = makePermParser (succ <$?> (n :: Integer, fail "foo"))
|
||
prs p "" `shouldParse` succ n
|
||
context "when stream in empty" $
|
||
it "returns the default value" $
|
||
property $ \n -> do
|
||
let p = makePermParser (succ <$?> (n :: Integer, integer))
|
||
prs p "" `shouldParse` succ n
|
||
|
||
describe "makeExprParser" $
|
||
it "works" $
|
||
property $ \a' c' v -> do
|
||
let (a,b,c) = getChars v
|
||
p = makePermParser
|
||
((,,) <$?> (a' :: String, some (char a))
|
||
<||> char b
|
||
<|?> (c', char c))
|
||
bis = elemIndices b s
|
||
preb = take (bis !! 1) s
|
||
cis = elemIndices c s
|
||
prec = take (cis !! 1) s
|
||
s = getInput v
|
||
if | length bis > 1 && (length cis <= 1 || head bis < head cis) ->
|
||
prs_ p s `shouldFailWith` err (posN (bis !! 1) s)
|
||
( utok b <> eeof <>
|
||
(if a `elem` preb then mempty else etok a) <>
|
||
(if c `elem` preb then mempty else etok c) )
|
||
| length cis > 1 ->
|
||
prs_ p s `shouldFailWith` err (posN (cis !! 1) s)
|
||
( utok c <>
|
||
(if a `elem` prec then mempty else etok a) <>
|
||
(if b `elem` prec then eeof else etok b) )
|
||
| b `notElem` s ->
|
||
prs_ p s `shouldFailWith` err (posN (length s) s)
|
||
( ueof <> etok b <>
|
||
(if a `notElem` s || last s == a then etok a else mempty) <>
|
||
(if c `elem` s then mempty else etok c) )
|
||
| otherwise ->
|
||
prs_ p s `shouldParse`
|
||
( if a `elem` s then filter (== a) s else a'
|
||
, b
|
||
, if c `elem` s then c else c' )
|