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module Test (
Test(..),
TestStep(..),
SourceLine(..),
MonadEval(..),
VarName(..), TypedVarName(..), textVarName, unpackVarName,
ExprType(..),
SomeVarValue(..), fromSomeVarValue, textSomeVarValue,
RecordSelector(..),
Expr(..), eval, gatherVars,
Regex(RegexPart, RegexString), regexMatch,
) where
import Data.Char
import Data.List
import Data.Text (Text)
import qualified Data.Text as T
import Data.Typeable
import Text.Regex.TDFA qualified as RE
import Text.Regex.TDFA.Text qualified as RE
import {-# SOURCE #-} Network
import {-# SOURCE #-} Process
import Util
data Test = Test
{ testName :: Text
, testSteps :: [TestStep]
}
data TestStep = forall a. ExprType a => Let SourceLine VarName (Expr a) [TestStep]
| Spawn (TypedVarName Process) (Either (TypedVarName Node) (Expr Node)) [TestStep]
| Send (Expr Process) (Expr Text)
| Expect SourceLine (Expr Process) (Expr Regex) [TypedVarName Text] [TestStep]
| Guard SourceLine (Expr Bool)
| Wait
newtype SourceLine = SourceLine Text
class MonadFail m => MonadEval m where
lookupVar :: VarName -> m SomeVarValue
newtype VarName = VarName Text
deriving (Eq, Ord)
newtype TypedVarName a = TypedVarName VarName
deriving (Eq, Ord)
textVarName :: VarName -> Text
textVarName (VarName name ) = name
unpackVarName :: VarName -> String
unpackVarName = T.unpack . textVarName
class Typeable a => ExprType a where
textExprType :: proxy a -> Text
textExprValue :: a -> Text
emptyVarValue :: a
recordMembers :: [(Text, RecordSelector a)]
recordMembers = []
instance ExprType Integer where
textExprType _ = T.pack "integer"
textExprValue x = T.pack (show x)
emptyVarValue = 0
instance ExprType Bool where
textExprType _ = T.pack "bool"
textExprValue True = T.pack "true"
textExprValue False = T.pack "false"
emptyVarValue = False
instance ExprType Text where
textExprType _ = T.pack "string"
textExprValue x = T.pack (show x)
emptyVarValue = T.empty
instance ExprType Regex where
textExprType _ = T.pack "regex"
textExprValue _ = T.pack "<regex>"
emptyVarValue = either error id $ regexCompile T.empty
data SomeVarValue = forall a. ExprType a => SomeVarValue a
data RecordSelector a = forall b. ExprType b => RecordSelector (a -> b)
fromSomeVarValue :: forall a m. (ExprType a, MonadFail m) => VarName -> SomeVarValue -> m a
fromSomeVarValue name (SomeVarValue value) = maybe (fail err) return $ cast value
where err = T.unpack $ T.concat [ T.pack "expected ", textExprType @a Proxy, T.pack ", but variable '", textVarName name, T.pack "' has type ", textExprType (Just value) ]
textSomeVarValue :: SomeVarValue -> Text
textSomeVarValue (SomeVarValue value) = textExprValue value
data Expr a where
Variable :: ExprType a => VarName -> Expr a
Literal :: ExprType a => a -> Expr a
Concat :: [Expr Text] -> Expr Text
Regex :: [Expr Regex] -> Expr Regex
UnOp :: (b -> a) -> Expr b -> Expr a
BinOp :: (b -> c -> a) -> Expr b -> Expr c -> Expr a
eval :: MonadEval m => Expr a -> m a
eval (Variable name) = fromSomeVarValue name =<< lookupVar name
eval (Literal value) = return value
eval (Concat xs) = T.concat <$> mapM eval xs
eval (Regex xs) = mapM eval xs >>= \case
[re@RegexCompiled {}] -> return re
parts -> case regexCompile $ T.concat $ map regexSource parts of
Left err -> fail err
Right re -> return re
eval (UnOp f x) = f <$> eval x
eval (BinOp f x y) = f <$> eval x <*> eval y
gatherVars :: forall a m. MonadEval m => Expr a -> m [(VarName, SomeVarValue)]
gatherVars = fmap (uniqOn fst . sortOn fst) . helper
where
helper :: forall b. Expr b -> m [(VarName, SomeVarValue)]
helper (Variable var) = (:[]) . (var,) <$> lookupVar var
helper (Literal _) = return []
helper (Concat es) = concat <$> mapM helper es
helper (Regex es) = concat <$> mapM helper es
helper (UnOp _ e) = helper e
helper (BinOp _ e f) = (++) <$> helper e <*> helper f
data Regex = RegexCompiled Text RE.Regex
| RegexPart Text
| RegexString Text
regexCompile :: Text -> Either String Regex
regexCompile src = either Left (Right . RegexCompiled src) $ RE.compile RE.defaultCompOpt RE.defaultExecOpt $
T.singleton '^' <> src <> T.singleton '$'
regexMatch :: Regex -> Text -> Either String (Maybe (Text, Text, Text, [Text]))
regexMatch (RegexCompiled _ re) text = RE.regexec re text
regexMatch _ _ = Left "regex not compiled"
regexSource :: Regex -> Text
regexSource (RegexCompiled src _) = src
regexSource (RegexPart src) = src
regexSource (RegexString str) = T.concatMap escapeChar str
where
escapeChar c | isAlphaNum c = T.singleton c
| c `elem` "`'<>" = T.singleton c
| otherwise = T.pack ['\\', c]
|