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-rw-r--r--src/Parser/Statement.hs357
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diff --git a/src/Parser/Statement.hs b/src/Parser/Statement.hs
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+module Parser.Statement (
+ testStep,
+) where
+
+import Control.Monad.Identity
+import Control.Monad.State
+
+import Data.Kind
+import Data.Maybe
+import qualified Data.Set as S
+import Data.Text qualified as T
+import qualified Data.Text.Lazy as TL
+import Data.Typeable
+
+import Text.Megaparsec hiding (State)
+import Text.Megaparsec.Char
+import qualified Text.Megaparsec.Char.Lexer as L
+
+import Network (Network, Node)
+import Parser.Core
+import Parser.Expr
+import Process (Process, ProcName(..))
+import Test
+import Util
+
+getSourceLine :: TestParser SourceLine
+getSourceLine = do
+ pstate <- statePosState <$> getParserState
+ return $ SourceLine $ T.concat
+ [ T.pack $ sourcePosPretty $ pstateSourcePos pstate
+ , T.pack ": "
+ , TL.toStrict $ TL.takeWhile (/='\n') $ pstateInput pstate
+ ]
+
+
+letStatement :: TestParser [TestStep]
+letStatement = do
+ line <- getSourceLine
+ indent <- L.indentLevel
+ wsymbol "let"
+ off <- stateOffset <$> getParserState
+ name <- varName
+ osymbol "="
+ SomeExpr e <- someExpr
+
+ localState $ do
+ let tname = TypedVarName name
+ addVarName off tname
+ void $ eol
+ body <- testBlock indent
+ return [Let line tname e body]
+
+forStatement :: TestParser [TestStep]
+forStatement = do
+ line <- getSourceLine
+ ref <- L.indentLevel
+ wsymbol "for"
+ voff <- stateOffset <$> getParserState
+ name <- varName
+
+ wsymbol "in"
+ loff <- stateOffset <$> getParserState
+ SomeExpr e <- someExpr
+ let err = parseError $ FancyError loff $ S.singleton $ ErrorFail $ T.unpack $
+ "expected a list, expression has type '" <> textExprType e <> "'"
+ ExprListUnpacker unpack _ <- maybe err return $ exprListUnpacker e
+
+ symbol ":"
+ scn
+ indent <- L.indentGuard scn GT ref
+ localState $ do
+ let tname = TypedVarName name
+ addVarName voff tname
+ body <- testBlock indent
+ return [For line tname (unpack <$> e) body]
+
+class (Typeable a, Typeable (ParamRep a)) => ParamType a where
+ type ParamRep a :: Type
+ type ParamRep a = a
+
+ parseParam :: proxy a -> TestParser (ParamRep a)
+ showParamType :: proxy a -> String
+
+ paramDefault :: proxy a -> TestParser (ParamRep a)
+ paramDefault _ = mzero
+
+ paramFromSomeExpr :: proxy a -> SomeExpr -> Maybe (ParamRep a)
+ paramFromSomeExpr _ (SomeExpr e) = cast e
+
+instance ParamType SourceLine where
+ parseParam _ = mzero
+ showParamType _ = "<source line>"
+
+instance ParamType ProcName where
+ parseParam _ = procName
+ showParamType _ = "<proc>"
+
+instance ExprType a => ParamType (TypedVarName a) where
+ parseParam _ = newVarName
+ showParamType _ = "<variable>"
+
+instance ExprType a => ParamType (Expr a) where
+ parseParam _ = typedExpr
+ showParamType _ = "<" ++ T.unpack (textExprType @a Proxy) ++ ">"
+
+instance ParamType a => ParamType [a] where
+ type ParamRep [a] = [ParamRep a]
+ parseParam _ = listOf (parseParam @a Proxy)
+ showParamType _ = showParamType @a Proxy ++ " [, " ++ showParamType @a Proxy ++ " ...]"
+ paramDefault _ = return []
+ paramFromSomeExpr _ se@(SomeExpr e) = cast e <|> ((:[]) <$> paramFromSomeExpr @a Proxy se)
+
+instance (ParamType a, ParamType b) => ParamType (Either a b) where
+ type ParamRep (Either a b) = Either (ParamRep a) (ParamRep b)
+ parseParam _ = try (Left <$> parseParam @a Proxy) <|> (Right <$> parseParam @b Proxy)
+ showParamType _ = showParamType @a Proxy ++ " or " ++ showParamType @b Proxy
+ paramFromSomeExpr _ se = (Left <$> paramFromSomeExpr @a Proxy se) <|> (Right <$> paramFromSomeExpr @b Proxy se)
+
+data SomeParam f = forall a. ParamType a => SomeParam (Proxy a) (f (ParamRep a))
+
+data CommandDef a = CommandDef [(String, SomeParam Proxy)] ([SomeParam Identity] -> a)
+
+instance Functor CommandDef where
+ fmap f (CommandDef types ctor) = CommandDef types (f . ctor)
+
+instance Applicative CommandDef where
+ pure x = CommandDef [] (\case [] -> x; _ -> error "command arguments mismatch")
+ CommandDef types1 ctor1 <*> CommandDef types2 ctor2 =
+ CommandDef (types1 ++ types2) $ \params ->
+ let (params1, params2) = splitAt (length types1) params
+ in ctor1 params1 $ ctor2 params2
+
+param :: forall a. ParamType a => String -> CommandDef a
+param name = CommandDef [(name, SomeParam (Proxy @a) Proxy)] $ \case
+ [SomeParam Proxy (Identity x)] -> fromJust $ cast x
+ _ -> error "command arguments mismatch"
+
+data ParamOrContext a
+
+instance ParamType a => ParamType (ParamOrContext a) where
+ type ParamRep (ParamOrContext a) = ParamRep a
+ parseParam _ = parseParam @a Proxy
+ showParamType _ = showParamType @a Proxy
+ paramDefault _ = gets testContext >>= \case
+ se@(SomeExpr ctx)
+ | Just e <- paramFromSomeExpr @a Proxy se -> return e
+ | otherwise -> fail $ showParamType @a Proxy <> " not available from context type '" <> T.unpack (textExprType ctx) <> "'"
+
+paramOrContext :: forall a. ParamType a => String -> CommandDef a
+paramOrContext name = CommandDef [(name, SomeParam (Proxy @(ParamOrContext a)) Proxy)] $ \case
+ [SomeParam Proxy (Identity x)] -> fromJust $ cast x
+ _ -> error "command arguments mismatch"
+
+cmdLine :: CommandDef SourceLine
+cmdLine = param ""
+
+data InnerBlock
+
+instance ParamType InnerBlock where
+ type ParamRep InnerBlock = [TestStep]
+ parseParam _ = mzero
+ showParamType _ = "<code block>"
+
+instance ParamType TestStep where
+ parseParam _ = mzero
+ showParamType _ = "<code line>"
+
+innerBlock :: CommandDef [TestStep]
+innerBlock = CommandDef [("", SomeParam (Proxy @InnerBlock) Proxy)] $ \case
+ [SomeParam Proxy (Identity x)] -> fromJust $ cast x
+ _ -> error "command arguments mismatch"
+
+command :: String -> CommandDef TestStep -> TestParser [TestStep]
+command name (CommandDef types ctor) = do
+ indent <- L.indentLevel
+ line <- getSourceLine
+ wsymbol name
+ localState $ do
+ restOfLine indent [] line $ map (fmap $ \(SomeParam p@(_ :: Proxy p) Proxy) -> SomeParam p $ Nothing @(ParamRep p)) types
+ where
+ restOfLine :: Pos -> [(Pos, [(String, SomeParam Maybe)])] -> SourceLine -> [(String, SomeParam Maybe)] -> TestParser [TestStep]
+ restOfLine cmdi partials line params = choice
+ [do void $ lookAhead eol
+ iparams <- forM params $ \case
+ (_, SomeParam (p :: Proxy p) Nothing)
+ | Just (Refl :: p :~: SourceLine) <- eqT -> return $ SomeParam p $ Identity line
+ | Just (Refl :: p :~: InnerBlock) <- eqT -> SomeParam p . Identity <$> restOfParts cmdi partials
+ (sym, SomeParam p Nothing) -> choice
+ [ SomeParam p . Identity <$> paramDefault p
+ , fail $ "missing " ++ (if null sym then "" else "'" ++ sym ++ "' ") ++ showParamType p
+ ]
+ (_, SomeParam (p :: Proxy p) (Just x)) -> return $ SomeParam p $ Identity x
+ return [ctor iparams]
+
+ ,do symbol ":"
+ scn
+ indent <- L.indentLevel
+ restOfParts cmdi ((indent, params) : partials)
+
+ ,do tryParams cmdi partials line [] params
+ ]
+
+ restOfParts :: Pos -> [(Pos, [(String, SomeParam Maybe)])] -> TestParser [TestStep]
+ restOfParts cmdi [] = testBlock cmdi
+ restOfParts cmdi partials@((partIndent, params) : rest) = do
+ scn
+ pos <- L.indentLevel
+ line <- getSourceLine
+ optional eof >>= \case
+ Just _ -> return []
+ _ | pos < partIndent -> restOfParts cmdi rest
+ | pos == partIndent -> (++) <$> restOfLine cmdi partials line params <*> restOfParts cmdi partials
+ | otherwise -> L.incorrectIndent EQ partIndent pos
+
+ tryParam sym (SomeParam (p :: Proxy p) cur) = do
+ when (not $ null sym) $ wsymbol sym
+ when (isJust cur) $ do
+ fail $ "multiple " ++ (if null sym then "unnamed" else "'" ++ sym ++ "'") ++ " parameters"
+ SomeParam p . Just <$> parseParam @p Proxy
+
+ tryParams cmdi partIndent line prev ((sym, p) : ps) = choice $
+ (if null sym then reverse else id) {- try unnamed parameter as last option -} $
+ [do p' <- tryParam sym p
+ restOfLine cmdi partIndent line $ concat [reverse prev, [(sym, p')], ps]
+ ,do tryParams cmdi partIndent line ((sym, p) : prev) ps
+ ]
+ tryParams _ _ _ _ [] = mzero
+
+testLocal :: TestParser [TestStep]
+testLocal = do
+ ref <- L.indentLevel
+ wsymbol "local"
+ symbol ":"
+ void $ eol
+
+ indent <- L.indentGuard scn GT ref
+ localState $ testBlock indent
+
+testWith :: TestParser [TestStep]
+testWith = do
+ ref <- L.indentLevel
+ wsymbol "with"
+
+ off <- stateOffset <$> getParserState
+ ctx@(SomeExpr (_ :: Expr ctxe)) <- someExpr
+ let expected =
+ [ SomeExprType @Network Proxy
+ , SomeExprType @Node Proxy
+ , SomeExprType @Process Proxy
+ ]
+ notAllowed <- flip allM expected $ \case
+ SomeExprType (Proxy :: Proxy a) | Just (Refl :: ctxe :~: a) <- eqT -> return False
+ _ -> return True
+ when notAllowed $ parseError $ FancyError off $ S.singleton $ ErrorFail $ T.unpack $
+ "expected " <> T.intercalate ", " (map (("'"<>) . (<>"'") . textSomeExprType) expected) <> ", expression has type '" <> textExprType @ctxe Proxy <> "'"
+
+ symbol ":"
+ void $ eol
+
+ indent <- L.indentGuard scn GT ref
+ localState $ do
+ modify $ \s -> s { testContext = ctx }
+ testBlock indent
+
+testSubnet :: TestParser [TestStep]
+testSubnet = command "subnet" $ Subnet
+ <$> param ""
+ <*> paramOrContext "of"
+ <*> innerBlock
+
+testNode :: TestParser [TestStep]
+testNode = command "node" $ DeclNode
+ <$> param ""
+ <*> paramOrContext "on"
+ <*> innerBlock
+
+testSpawn :: TestParser [TestStep]
+testSpawn = command "spawn" $ Spawn
+ <$> param "as"
+ <*> paramOrContext "on"
+ <*> innerBlock
+
+testSend :: TestParser [TestStep]
+testSend = command "send" $ Send
+ <$> paramOrContext "to"
+ <*> param ""
+
+testExpect :: TestParser [TestStep]
+testExpect = command "expect" $ Expect
+ <$> cmdLine
+ <*> paramOrContext "from"
+ <*> param ""
+ <*> param "capture"
+ <*> innerBlock
+
+testGuard :: TestParser [TestStep]
+testGuard = command "guard" $ Guard
+ <$> cmdLine
+ <*> param ""
+
+testDisconnectNode :: TestParser [TestStep]
+testDisconnectNode = command "disconnect_node" $ DisconnectNode
+ <$> paramOrContext ""
+ <*> innerBlock
+
+testDisconnectNodes :: TestParser [TestStep]
+testDisconnectNodes = command "disconnect_nodes" $ DisconnectNodes
+ <$> paramOrContext ""
+ <*> innerBlock
+
+testDisconnectUpstream :: TestParser [TestStep]
+testDisconnectUpstream = command "disconnect_upstream" $ DisconnectUpstream
+ <$> paramOrContext ""
+ <*> innerBlock
+
+testPacketLoss :: TestParser [TestStep]
+testPacketLoss = command "packet_loss" $ PacketLoss
+ <$> param ""
+ <*> paramOrContext "on"
+ <*> innerBlock
+
+
+testWait :: TestParser [TestStep]
+testWait = do
+ wsymbol "wait"
+ return [Wait]
+
+testBlock :: Pos -> TestParser [TestStep]
+testBlock indent = concat <$> go
+ where
+ go = do
+ scn
+ pos <- L.indentLevel
+ optional eof >>= \case
+ Just _ -> return []
+ _ | pos < indent -> return []
+ | pos == indent -> (:) <$> testStep <*> go
+ | otherwise -> L.incorrectIndent EQ indent pos
+
+testStep :: TestParser [TestStep]
+testStep = choice
+ [ letStatement
+ , forStatement
+ , testLocal
+ , testWith
+ , testSubnet
+ , testNode
+ , testSpawn
+ , testSend
+ , testExpect
+ , testGuard
+ , testDisconnectNode
+ , testDisconnectNodes
+ , testDisconnectUpstream
+ , testPacketLoss
+ , testWait
+ ]
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-10 03:04:13 +0000