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module Parser (
parseTestFile,
) where
import Control.Monad.State
import Data.Char
import Data.Set (Set)
import qualified Data.Set as S
import Data.Text (Text)
import qualified Data.Text.Lazy as TL
import qualified Data.Text.Lazy.IO as TL
import Data.Void
import Text.Megaparsec hiding (State)
import Text.Megaparsec.Char
import qualified Text.Megaparsec.Char.Lexer as L
import Text.Regex.TDFA (defaultCompOpt, defaultExecOpt)
import Text.Regex.TDFA.String
import System.Exit
import Test
type TestParser = ParsecT Void TestStream (State (Set ProcName))
type TestStream = TL.Text
skipLineComment :: TestParser ()
skipLineComment = L.skipLineComment $ TL.pack "#"
scn :: TestParser ()
scn = L.space space1 skipLineComment empty
sc :: TestParser ()
sc = L.space (void $ takeWhile1P Nothing f) skipLineComment empty
where f x = x == ' ' || x == '\t'
wordChar :: TestParser (Token TestStream)
wordChar = alphaNumChar <|> char '_'
lexeme :: TestParser a -> TestParser a
lexeme = L.lexeme sc
symbol :: String -> TestParser ()
symbol = void . L.symbol sc . TL.pack
wsymbol :: String -> TestParser ()
wsymbol str = void $ lexeme $ string (TL.pack str) <* notFollowedBy wordChar
toplevel :: TestParser a -> TestParser a
toplevel = L.nonIndented scn
block :: (a -> [b] -> TestParser c) -> TestParser a -> TestParser b -> TestParser c
block merge header item = L.indentBlock scn $ do
h <- header
choice
[ do try $ void $ lexeme $ char ':'
return $ L.IndentSome Nothing (merge h) item
, L.IndentNone <$> merge h []
]
nodeName :: TestParser NodeName
nodeName = label "network node name" $ lexeme $ do
c <- lowerChar
cs <- takeWhileP Nothing (\x -> isAlphaNum x || x == '_' || x == '-')
return $ NodeName $ TL.toStrict (c `TL.cons` cs)
procName :: TestParser ProcName
procName = label "process name" $ lexeme $ do
c <- lowerChar
cs <- takeWhileP Nothing (\x -> isAlphaNum x || x == '_' || x == '-')
return $ ProcName $ TL.toStrict (c `TL.cons` cs)
quotedString :: TestParser Text
quotedString = label "string" $ lexeme $ do
symbol "\""
str <- takeWhileP Nothing (/='"')
symbol "\""
return $ TL.toStrict str
regex :: TestParser Regex
regex = label "regular expression" $ lexeme $ do
symbol "/"
pat <- takeWhileP Nothing (/='/')
symbol "/"
case compile defaultCompOpt defaultExecOpt ("^" ++ TL.unpack pat ++ "$") of
Left err -> fail err
Right re -> return re
testSpawn :: TestParser TestStep
testSpawn = do
wsymbol "spawn"
wsymbol "on"
nname <- nodeName
wsymbol "as"
pname <- procName
return $ Spawn pname nname
testSend :: TestParser TestStep
testSend = do
wsymbol "send"
line <- quotedString
wsymbol "to"
pname <- procName
return $ Send pname line
testExpect :: TestParser TestStep
testExpect = do
wsymbol "expect"
re <- regex
wsymbol "from"
pname <- procName
return $ Expect pname re
testWait :: TestParser TestStep
testWait = do
wsymbol "wait"
return $ Wait
parseTestDefinition :: TestParser Test
parseTestDefinition = label "test definition" $ toplevel $ do
block (\name steps -> return $ Test name steps) header (testSpawn <|> testSend <|> testExpect <|> testWait)
where header = do
wsymbol "test"
lexeme $ TL.toStrict <$> takeWhileP (Just "test name") (/=':')
parseTestDefinitions :: TestParser [Test]
parseTestDefinitions = do
tests <- many parseTestDefinition
eof
return tests
parseTestFile :: FilePath -> IO [Test]
parseTestFile path = do
content <- TL.readFile path
case evalState (runParserT parseTestDefinitions path content) S.empty of
Left err -> putStr (errorBundlePretty err) >> exitFailure
Right tests -> return tests
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