#if __GLASGOW_HASKELL__ <= 708
#endif
module Agda.TypeChecking.Monad.Context where
import Control.Applicative
import Control.Monad.Reader
import Data.List hiding (sort)
import qualified Data.Map as Map
import Data.Monoid
import Agda.Syntax.Abstract.Name
import Agda.Syntax.Common
import Agda.Syntax.Internal
import Agda.Syntax.Scope.Monad (getLocalVars, setLocalVars)
import Agda.TypeChecking.Monad.Base
import Agda.TypeChecking.Substitute
import Agda.TypeChecking.Monad.Open
import Agda.Utils.Except ( MonadError(catchError) )
import Agda.Utils.Functor
import Agda.Utils.List ((!!!), downFrom)
modifyContextEntry :: (Dom (Name, Type) -> Dom (Name, Type)) -> ContextEntry -> ContextEntry
modifyContextEntry f ce = ce { ctxEntry = f (ctxEntry ce) }
modifyContextEntries :: (Dom (Name, Type) -> Dom (Name, Type)) -> Context -> Context
modifyContextEntries f = map (modifyContextEntry f)
modifyContext :: MonadTCM tcm => (Context -> Context) -> tcm a -> tcm a
modifyContext f = local $ \e -> e { envContext = f $ envContext e }
mkContextEntry :: MonadTCM tcm => Dom (Name, Type) -> tcm ContextEntry
mkContextEntry x = do
i <- fresh
return $ Ctx i x
inContext :: MonadTCM tcm => [Dom (Name, Type)] -> tcm a -> tcm a
inContext xs ret = do
ctx <- mapM mkContextEntry xs
modifyContext (const ctx) ret
inTopContext :: MonadTCM tcm => tcm a -> tcm a
inTopContext cont = do
locals <- liftTCM $ getLocalVars
liftTCM $ setLocalVars []
a <- modifyContext (const []) cont
liftTCM $ setLocalVars locals
return a
escapeContext :: MonadTCM tcm => Int -> tcm a -> tcm a
escapeContext n = modifyContext $ drop n
addCtx :: MonadTCM tcm => Name -> Dom Type -> tcm a -> tcm a
addCtx x a ret = do
ctx <- map (nameConcrete . fst . unDom) <$> getContext
let x' = head $ filter (notTaken ctx) $ iterate nextName x
ce <- mkContextEntry $ (x',) <$> a
modifyContext (ce :) ret
where
notTaken xs x = isNoName x || nameConcrete x `notElem` xs
class AddContext b where
addContext :: MonadTCM tcm => b -> tcm a -> tcm a
#if __GLASGOW_HASKELL__ >= 710
instance AddContext a => AddContext [a] where
#else
instance AddContext a => AddContext [a] where
#endif
addContext = flip (foldr addContext)
instance AddContext (Name, Dom Type) where
addContext = uncurry addCtx
instance AddContext (Dom (Name, Type)) where
addContext = addContext . distributeF
instance AddContext ([Name], Dom Type) where
addContext (xs, dom) = addContext (bindsToTel' id xs dom)
instance AddContext ([WithHiding Name], Dom Type) where
addContext ([] , dom) = id
addContext (WithHiding h x : xs, dom) =
addContext (x , mapHiding (mappend h) dom) .
addContext (xs, raise 1 dom)
instance AddContext (String, Dom Type) where
addContext (s, dom) ret = do
x <- freshName_ s
addCtx x dom ret
instance AddContext (Dom (String, Type)) where
addContext = addContext . distributeF
instance AddContext (Dom Type) where
addContext dom = addContext ("_", dom)
instance AddContext Name where
addContext x = addContext (x, dummyDom)
#if __GLASGOW_HASKELL__ >= 710
instance AddContext String where
#else
instance AddContext String where
#endif
addContext s = addContext (s, dummyDom)
instance AddContext Telescope where
addContext tel ret = loop tel where
loop EmptyTel = ret
loop (ExtendTel t tel) = underAbstraction t tel loop
addCtxs :: MonadTCM tcm => [Name] -> Dom Type -> tcm a -> tcm a
addCtxs [] _ k = k
addCtxs (x:xs) t k = addCtx x t $ addCtxs xs (raise 1 t) k
addCtxString :: MonadTCM tcm => String -> Dom Type -> tcm a -> tcm a
addCtxString s a m = do
x <- freshName_ s
addCtx x a m
addCtxString_ :: MonadTCM tcm => String -> tcm a -> tcm a
addCtxString_ s = addCtxString s dummyDom
addCtxStrings_ :: MonadTCM tcm => [String] -> tcm a -> tcm a
addCtxStrings_ = flip (foldr addCtxString_)
dummyDom :: Dom Type
dummyDom = defaultDom typeDontCare
underAbstraction :: (Subst t a, MonadTCM tcm) => Dom Type -> Abs a -> (a -> tcm b) -> tcm b
underAbstraction _ (NoAbs _ v) k = k v
underAbstraction t a k = do
x <- freshName_ $ realName $ absName a
addCtx x t $ k $ absBody a
where
realName s = if isNoName s then "x" else argNameToString s
underAbstraction_ :: (Subst t a, MonadTCM tcm) => Abs a -> (a -> tcm b) -> tcm b
underAbstraction_ = underAbstraction dummyDom
addCtxTel :: MonadTCM tcm => Telescope -> tcm a -> tcm a
addCtxTel tel ret = loop tel where
loop EmptyTel = ret
loop (ExtendTel t tel) = underAbstraction t tel loop
addLetBinding :: MonadTCM tcm => ArgInfo -> Name -> Term -> Type -> tcm a -> tcm a
addLetBinding info x v t0 ret = do
let t = Dom info t0
vt <- liftTCM $ makeOpen (v, t)
flip local ret $ \e -> e { envLetBindings = Map.insert x vt $ envLetBindings e }
getContext :: MonadReader TCEnv m => m [Dom (Name, Type)]
getContext = asks $ map ctxEntry . envContext
getContextSize :: (Applicative m, MonadReader TCEnv m) => m Nat
getContextSize = genericLength <$> asks envContext
getContextArgs :: (Applicative m, MonadReader TCEnv m) => m Args
getContextArgs = reverse . zipWith mkArg [0..] <$> getContext
where mkArg i (Dom info _) = Arg info $ var i
getContextTerms :: (Applicative m, MonadReader TCEnv m) => m [Term]
getContextTerms = map var . downFrom <$> getContextSize
getContextTelescope :: (Applicative m, MonadReader TCEnv m) => m Telescope
getContextTelescope = telFromList' nameToArgName . reverse <$> getContext
getContextId :: MonadReader TCEnv m => m [CtxId]
getContextId = asks $ map ctxId . envContext
getContextNames :: (Applicative m, MonadReader TCEnv m) => m [Name]
getContextNames = map (fst . unDom) <$> getContext
lookupBV :: MonadReader TCEnv m => Nat -> m (Dom (Name, Type))
lookupBV n = do
ctx <- getContext
let failure = fail $ "deBruijn index out of scope: " ++ show n ++
" in context " ++ show (map (fst . unDom) ctx)
maybe failure (return . fmap (raise $ n + 1)) $ ctx !!! n
typeOfBV' :: (Applicative m, MonadReader TCEnv m) => Nat -> m (Dom Type)
typeOfBV' n = fmap snd <$> lookupBV n
typeOfBV :: (Applicative m, MonadReader TCEnv m) => Nat -> m Type
typeOfBV i = unDom <$> typeOfBV' i
nameOfBV :: (Applicative m, MonadReader TCEnv m) => Nat -> m Name
nameOfBV n = fst . unDom <$> lookupBV n
getVarInfo
#if __GLASGOW_HASKELL__ <= 708
:: (Applicative m, MonadReader TCEnv m)
#else
:: MonadReader TCEnv m
#endif
=> Name -> m (Term, Dom Type)
getVarInfo x =
do ctx <- getContext
def <- asks envLetBindings
case findIndex ((==x) . fst . unDom) ctx of
Just n -> do
t <- typeOfBV' n
return (var n, t)
_ ->
case Map.lookup x def of
Just vt -> getOpen vt
_ -> fail $ "unbound variable " ++ show (nameConcrete x)