module YesodDsl.ParserState (ParserMonad, initParserState, getParserState,
getPath, getParsed,
setParserState, runParser, pushScope, popScope, declare, SymType(..),
ParserState, mkLoc, parseErrorCount, withSymbol, withSymbolNow,
pError,
hasReserved,
requireClass,
requireEntity,
requireEntityId,
requireEntityField,
requireField,
requireFieldType,
requireEnumValue,
requireParam,
setCurrentHandlerType,
getCurrentHandlerType,
requireHandlerType,
validateExtractField,
validateInsert,
beginHandler,
statement,
lastStatement,
addCheck,
postValidation) where
import qualified Data.Map as Map
import Control.Monad.State.Lazy
import Control.Monad.Trans.Class
import YesodDsl.AST
import YesodDsl.Lexer
import YesodDsl.ExpandMacros
import YesodDsl.ClassImplementer
import System.IO (FilePath)
import qualified Data.List as L
import Data.Maybe
data SymType = SEnum EnumType
| SClass Class
| SEntity EntityName
| SEntityId EntityName
| SDefine Define
| SField Field
| SFieldType FieldType
| SUnique Unique
| SRoute Route
| SHandler Handler
| SParam
| SForParam InputFieldRef
| SReserved
instance Show SymType where
show st = case st of
SEnum _ -> "enum"
SClass _ -> "class"
SEntity _ -> "entity"
SEntityId _ -> "entity id"
SDefine _ -> "define"
SField _ -> "field"
SFieldType _ -> "field type"
SUnique _ -> "unique"
SRoute _ -> "route"
SHandler _ -> "handler"
SParam -> "param"
SForParam _ -> "for-param"
SReserved -> "reserved"
data Sym = Sym Int Location SymType
type ParserMonad = StateT ParserState IO
type Syms = Map.Map String[Sym]
type EntityValidation = (EntityName, Entity -> ParserMonad ())
type PendingValidation = Syms -> ParserMonad ()
data ParserState = ParserState {
psSyms :: Syms,
psScopeId :: Int,
psPath :: FilePath,
psParsed :: [FilePath],
psErrors :: Int,
psHandlerType :: Maybe HandlerType,
psPendingValidations :: [[PendingValidation]],
psEntityValidations :: [EntityValidation],
psLastStatement :: Maybe (Location, String),
psChecks :: [(Location,String,FieldType)]
}
initParserState :: ParserState
initParserState = ParserState {
psSyms = Map.empty,
psScopeId = 0,
psPath = "",
psParsed = [],
psErrors = 0,
psHandlerType = Nothing,
psPendingValidations = [],
psEntityValidations = [],
psLastStatement = Nothing,
psChecks = []
}
getParserState :: ParserMonad ParserState
getParserState = get
getPath :: ParserMonad FilePath
getPath = gets psPath
getParsed :: ParserMonad [FilePath]
getParsed = gets psParsed
setCurrentHandlerType :: HandlerType -> ParserMonad ()
setCurrentHandlerType ht = modify $ \ps -> ps {
psHandlerType = Just ht
}
requireHandlerType :: Location -> String -> (HandlerType -> Bool) -> ParserMonad ()
requireHandlerType l n f = do
mht <- gets psHandlerType
when (fmap f mht /= Just True) $
pError l $ n ++ " not allowed "
++ (fromMaybe "outside handler" $
mht >>= \ht' -> return $ "in " ++ show ht' ++ " handler")
getCurrentHandlerType :: ParserMonad (Maybe HandlerType)
getCurrentHandlerType = gets psHandlerType
setParserState :: ParserState -> ParserMonad ()
setParserState = put
runEntityValidation :: Module -> EntityValidation -> ParserMonad ()
runEntityValidation m (en,f) =
case L.find (\e -> entityName e == en) $ modEntities m of
Just e -> f e
Nothing -> return ()
validateExtractField :: Location -> String -> ParserMonad ()
validateExtractField l s = if s `elem` validFields
then return ()
else pError l $ "Unknown subfield '" ++ s ++ "' to extract"
where
validFields = [
"century", "day", "decade", "dow", "doy", "epoch", "hour",
"isodow", "microseconds", "millennium", "milliseconds",
"minute", "month", "quarter", "second", "timezone",
"timezone_hour", "timezone_minute", "week", "year"
]
validateInsert :: Location -> Entity -> Maybe [InputField] -> ParserMonad ()
validateInsert l e (Just ifs) = do
case [ fieldName f | f <- entityFields e,
(not . fieldOptional) f,
isNothing (fieldDefault f) ]
L.\\ [ fn | (fn,_) <- ifs ] of
fs@(_:_) -> pError l $ "Missing required fields without default value: " ++ (show fs)
_ -> return ()
validateInsert _ _ _ = return ()
beginHandler :: ParserMonad ()
beginHandler = modify $ \ps -> ps {
psLastStatement = Nothing
}
statement :: Location -> String -> ParserMonad ()
statement l s= do
mlast <- gets psLastStatement
fromMaybe (return ()) (mlast >>= \(l',s') -> do
return $ pError l $ "'" ++ s ++ "' not allowed after '" ++ s' ++ "' in "
++ show l')
lastStatement :: Location -> String -> ParserMonad ()
lastStatement l s = do
statement l s
modify $ \ps -> ps {
psLastStatement = listToMaybe $ catMaybes [
psLastStatement ps, Just (l,s)
]
}
addCheck :: Location -> String -> FieldType -> ParserMonad ()
addCheck l n ft = do
checks <- gets psChecks
forM_ [ c | c@(l',n',ft') <- checks, ft' /= ft, n' == n ] $ \(l',n',ft') ->
pError l $ "'" ++ n ++ "' is for " ++ show ft ++ " but '"
++ n' ++ "' in " ++ show l' ++ " is for " ++ show ft'
modify $ \ps -> ps { psChecks = psChecks ps ++ [(l,n,ft)] }
postValidation :: Module -> ParserState -> IO Int
postValidation m ps = do
ps' <- execStateT (mapM (runEntityValidation m) $
psEntityValidations ps) $ ps
return $ psErrors ps'
runParser :: FilePath -> ParserState -> ParserMonad a -> IO (a,ParserState)
runParser path ps m = do
(r,ps') <- runStateT m $ ps { psPath = path, psParsed = path:psParsed ps }
return (r, ps' { psPath = psPath ps} )
pushScope :: ParserMonad ()
pushScope = modify $ \ps -> ps {
psScopeId = psScopeId ps + 1,
psPendingValidations = []:psPendingValidations ps
}
popScope :: ParserMonad ()
popScope = do
(vs:_) <- gets psPendingValidations
syms <- gets psSyms
forM_ vs $ \v -> v syms
modify $ \ps -> ps {
psSyms = Map.filter (not . null) $
Map.map (filter (\(Sym s _ _) -> s < psScopeId ps)) $ psSyms ps,
psScopeId = psScopeId ps 1,
psPendingValidations = tail $ psPendingValidations ps
}
pError :: Location -> String -> ParserMonad ()
pError l e = do
lift $ putStrLn $ show l ++ ": " ++ e
modify $ \ps -> ps { psErrors = psErrors ps + 1 }
declare :: Location -> String -> SymType -> ParserMonad ()
declare l n t = do
ps <- get
let sym = [Sym (psScopeId ps) l t]
case Map.lookup n (psSyms ps) of
Just ((Sym s l' _):_) -> if s == psScopeId ps
then do
pError l $ "'" ++ n
++ "' already declared in " ++ show l'
return ()
else put $ ps {
psSyms = Map.adjust (sym++) n (psSyms ps)
}
_ -> put $ ps {
psSyms = Map.insert n sym $ psSyms ps
}
mkLoc :: Token -> ParserMonad Location
mkLoc t = do
path <- gets psPath
return $ Loc path (tokenLineNum t) (tokenColNum t)
parseErrorCount :: ParserState -> Int
parseErrorCount = psErrors
addEntityValidation :: EntityValidation -> ParserMonad ()
addEntityValidation ev = modify $ \ps -> ps {
psEntityValidations = psEntityValidations ps ++ [ev]
}
addPendingValidation :: (Syms -> ParserMonad ()) -> ParserMonad ()
addPendingValidation v = modify $ \ps -> let vs = psPendingValidations ps in ps {
psPendingValidations = (v:(head vs)):tail vs
}
hasReserved :: String -> ParserMonad Bool
hasReserved n = do
syms <- gets psSyms
return $ fromMaybe False $Map.lookup n syms >>= return . (not. null . (filter match))
where
match (Sym _ _ SReserved) = True
match _ = False
withSymbol' :: Syms -> Location -> String -> (Location -> Location -> SymType -> ParserMonad ()) -> ParserMonad ()
withSymbol' syms l n f = do
case Map.lookup n syms >>= return . (filter notReserved) of
Just ((Sym _ l' st):_) -> f l l' st
_ -> pError l $ "Reference to an undeclared identifier '"
++ n ++ "'"
where
notReserved (Sym _ _ SReserved) = False
notReserved _ = True
withSymbolNow :: Location -> String -> (Location -> Location -> SymType -> ParserMonad()) -> ParserMonad ()
withSymbolNow l n f = do
syms <- gets psSyms
withSymbol' syms l n f
withSymbol :: Location -> String -> (Location -> Location -> SymType -> ParserMonad ()) -> ParserMonad ()
withSymbol l n f = addPendingValidation $ \syms -> withSymbol' syms l n f
requireClass :: (Class -> ParserMonad ()) -> (Location -> Location -> SymType -> ParserMonad ())
requireClass f = f'
where f' _ _ (SClass c) = f c
f' l1 l2 st = pError l1 $ "Reference to " ++ show st ++ " declared in " ++ show l2 ++ " (expected class)"
requireEntity :: (Entity -> ParserMonad ()) -> (Location -> Location -> SymType -> ParserMonad ())
requireEntity f = f'
where f' _ _ (SEntity en) = addEntityValidation (en, f)
f' l1 l2 st = pError l1 $ "Reference to " ++ show st ++ " declared in " ++ show l2 ++ " (expected entity)"
requireEntityId :: (EntityName -> ParserMonad ()) -> (Location -> Location -> SymType -> ParserMonad ())
requireEntityId f = f'
where f' _ _ (SEntityId en) = f en
f' l1 l2 st = pError l1 $ "Reference to " ++ show st ++ " declared in " ++ show l2 ++ " (expected entity id)"
requireEntityField :: Location -> FieldName -> ((Entity,Field) -> ParserMonad ()) -> (Location -> Location -> SymType -> ParserMonad ())
requireEntityField l fn fun = fun'
where fun' _ _ (SEntity en) = addEntityValidation (en, \e ->
case L.find (\f -> fieldName f == fn) $ entityFields e of
Just f -> fun (e,f)
Nothing -> pError l $ "Reference to undeclared field '"
++ fn ++ "' of entity '" ++ entityName e ++ "'")
fun' l1 l2 st = pError l1 $ "Reference to " ++ show st ++ " declared in " ++ show l2 ++ " (expected entity)"
requireFieldType :: (FieldType -> ParserMonad()) -> (Location -> Location -> SymType -> ParserMonad ())
requireFieldType f = fun'
where
fun' _ _ (SFieldType ft) = f ft
fun' l1 l2 st = pError l1 $ "Reference to " ++ show st ++ " declared in " ++ show l2 ++ " (expected field type)"
requireEnumValue :: Location -> FieldName -> (Location -> Location -> SymType -> ParserMonad ())
requireEnumValue l fn = fun'
where
fun' _ _ (SEnum e) =
case L.find (\ev' -> ev' == fn) $ enumValues e of
Just ev -> return ()
Nothing -> pError l $ "Reference to undeclared enum value '"
++ fn ++ "' of enum '" ++ enumName e ++ "'"
fun' l1 l2 st = pError l1 $ "Reference to " ++ show st ++ " declared in " ++ show l2 ++ " (expected enum)"
requireParam :: (Location -> Location -> SymType -> ParserMonad ())
requireParam = fun'
where
fun' _ _ SParam = return ()
fun' l1 l2 st = pError l1 $ "Reference to " ++ show st ++ " declared in " ++ show l2 ++ " (expected param)"
requireField:: (Field -> ParserMonad ()) -> (Location -> Location -> SymType -> ParserMonad ())
requireField f = f'
where f' _ _ (SField sf) = f sf
f' l1 l2 st = pError l1 $ "Reference to " ++ show st ++ " declared in " ++ show l2 ++ " (expected field)"