module YesodDsl.ParserState (ParserMonad, initParserState, getParserState,
getPath, getParsed,
setParserState, runParser, pushScope, popScope, declare, SymType(..),
ParserState, mkLoc, parseErrorCount, withSymbol,
requireClass,
requireEntity,
requireEntityField,
requireField,
setCurrentHandlerType,
unsetCurrentHandlerType,
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
data SymType = SEnum EnumType
| SClass Class
| SEntity EntityName
| SDefine Define
| SField Field
| 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"
SDefine _ -> "define"
SField _ -> "field"
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 ())
data ParserState = ParserState {
psSyms :: Syms,
psScopeId :: Int,
psPath :: FilePath,
psParsed :: [FilePath],
psErrors :: Int,
psHandlerType :: Maybe HandlerType,
psEntityValidations :: [EntityValidation]
}
initParserState :: ParserState
initParserState = ParserState {
psSyms = Map.empty,
psScopeId = 0,
psPath = "",
psParsed = [],
psErrors = 0,
psHandlerType = Nothing,
psEntityValidations = []
}
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
}
unsetCurrentHandlerType :: ParserMonad ()
unsetCurrentHandlerType = modify $ \ps -> ps {
psHandlerType = Nothing
}
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 ()
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
}
popScope :: ParserMonad ()
popScope = modify $ \ps -> ps {
psSyms = Map.filter (not . null) $
Map.map (filter (\(Sym s _ _) -> s < psScopeId ps)) $ psSyms ps,
psScopeId = psScopeId ps 1
}
pError :: Location -> String -> ParserMonad ()
pError l e = do
return ()
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 = do
modify $ \ps -> ps {
psEntityValidations = psEntityValidations ps ++ [ev]
}
withSymbol :: Location -> String -> (Location -> Location -> SymType -> ParserMonad ()) -> ParserMonad ()
withSymbol l n f = do
syms <- gets psSyms
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
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)"
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)"
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)"