378 lines
13 KiB
Haskell
378 lines
13 KiB
Haskell
{-# LANGUAGE AllowAmbiguousTypes #-}
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{-# LANGUAGE ConstraintKinds #-}
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{-# LANGUAGE DeriveTraversable #-}
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{-# LANGUAGE FlexibleContexts #-}
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{-# LANGUAGE FlexibleInstances #-}
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{-# LANGUAGE IncoherentInstances #-}
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{-# LANGUAGE LambdaCase #-}
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{-# LANGUAGE MultiParamTypeClasses #-}
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{-# LANGUAGE OverloadedStrings #-}
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{-# LANGUAGE ScopedTypeVariables #-}
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{-# LANGUAGE TupleSections #-}
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{-# LANGUAGE TypeApplications #-}
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{-# LANGUAGE TypeFamilies #-}
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{-# LANGUAGE UndecidableInstances #-}
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{-# OPTIONS_GHC -Wno-missing-signatures #-}
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{-# OPTIONS_GHC -fno-warn-name-shadowing #-}
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-- | Although there are a lot of instances in this file, really it's just a
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-- combinatorial explosion of the following combinations:
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--
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-- - Several Haskell types being converted to/from Nix wrappers
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-- - Several types of Nix wrappers
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-- - Whether to be shallow or deep while unwrapping
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module Nix.Convert where
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import Control.Monad.Free
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import Data.ByteString
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import qualified Data.HashMap.Lazy as M
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import Data.Maybe
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import Data.Text ( Text )
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import qualified Data.Text as Text
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import Data.Text.Encoding ( encodeUtf8
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, decodeUtf8
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)
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import Nix.Atoms
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import Nix.Effects
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import Nix.Expr.Types
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import Nix.Expr.Types.Annotated
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import Nix.Frames
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import Nix.String
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import Nix.Value
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import Nix.Value.Monad
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import Nix.Thunk
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import Nix.Utils
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newtype Deeper a = Deeper { getDeeper :: a }
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deriving (Typeable, Functor, Foldable, Traversable)
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{-
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IMPORTANT NOTE
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We used to have Text instances of FromValue, ToValue, FromNix, and ToNix.
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However, we're removing these instances because they are dangerous due to the
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fact that they hide the way string contexts are handled. It's better to have to
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explicitly handle string context in a way that is appropriate for the situation.
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Do not add these instances back!
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-}
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{-----------------------------------------------------------------------
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FromValue
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-----------------------------------------------------------------------}
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class FromValue a m v where
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fromValue :: v -> m a
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fromValueMay :: v -> m (Maybe a)
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type Convertible e t f m
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= (Framed e m, MonadDataErrorContext t f m, MonadThunk t m (NValue t f m))
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instance ( Convertible e t f m
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, MonadValue (NValue t f m) m
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, FromValue a m (NValue' t f m (NValue t f m))
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)
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=> FromValue a m (NValue t f m) where
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fromValueMay = flip demand $ \case
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Pure t -> force t fromValueMay
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Free v -> fromValueMay v
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fromValue = flip demand $ \case
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Pure t -> force t fromValue
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Free v -> fromValue v
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instance ( Convertible e t f m
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, MonadValue (NValue t f m) m
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, FromValue a m (Deeper (NValue' t f m (NValue t f m)))
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)
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=> FromValue a m (Deeper (NValue t f m)) where
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fromValueMay (Deeper v) = demand v $ \case
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Pure t -> force t (fromValueMay . Deeper)
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Free v -> fromValueMay (Deeper v)
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fromValue (Deeper v) = demand v $ \case
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Pure t -> force t (fromValue . Deeper)
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Free v -> fromValue (Deeper v)
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instance Convertible e t f m
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=> FromValue () m (NValue' t f m (NValue t f m)) where
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fromValueMay = \case
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NVConstant' NNull -> pure $ Just ()
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_ -> pure Nothing
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fromValue v = fromValueMay v >>= \case
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Just b -> pure b
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_ -> throwError $ Expectation @t @f @m TNull (Free v)
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instance Convertible e t f m
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=> FromValue Bool m (NValue' t f m (NValue t f m)) where
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fromValueMay = \case
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NVConstant' (NBool b) -> pure $ Just b
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_ -> pure Nothing
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fromValue v = fromValueMay v >>= \case
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Just b -> pure b
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_ -> throwError $ Expectation @t @f @m TBool (Free v)
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instance Convertible e t f m
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=> FromValue Int m (NValue' t f m (NValue t f m)) where
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fromValueMay = \case
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NVConstant' (NInt b) -> pure $ Just (fromInteger b)
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_ -> pure Nothing
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fromValue v = fromValueMay v >>= \case
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Just b -> pure b
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_ -> throwError $ Expectation @t @f @m TInt (Free v)
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instance Convertible e t f m
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=> FromValue Integer m (NValue' t f m (NValue t f m)) where
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fromValueMay = \case
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NVConstant' (NInt b) -> pure $ Just b
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_ -> pure Nothing
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fromValue v = fromValueMay v >>= \case
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Just b -> pure b
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_ -> throwError $ Expectation @t @f @m TInt (Free v)
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instance Convertible e t f m
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=> FromValue Float m (NValue' t f m (NValue t f m)) where
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fromValueMay = \case
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NVConstant' (NFloat b) -> pure $ Just b
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NVConstant' (NInt i) -> pure $ Just (fromInteger i)
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_ -> pure Nothing
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fromValue v = fromValueMay v >>= \case
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Just b -> pure b
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_ -> throwError $ Expectation @t @f @m TFloat (Free v)
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instance ( Convertible e t f m
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, MonadValue (NValue t f m) m
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, MonadEffects t f m
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)
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=> FromValue NixString m (NValue' t f m (NValue t f m)) where
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fromValueMay = \case
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NVStr' ns -> pure $ Just ns
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NVPath' p ->
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Just
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. hackyMakeNixStringWithoutContext
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. Text.pack
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. unStorePath
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<$> addPath p
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NVSet' s _ -> case M.lookup "outPath" s of
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Nothing -> pure Nothing
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Just p -> fromValueMay p
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_ -> pure Nothing
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fromValue v = fromValueMay v >>= \case
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Just b -> pure b
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_ -> throwError $ Expectation @t @f @m (TString NoContext) (Free v)
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instance Convertible e t f m
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=> FromValue ByteString m (NValue' t f m (NValue t f m)) where
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fromValueMay = \case
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NVStr' ns -> pure $ encodeUtf8 <$> hackyGetStringNoContext ns
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_ -> pure Nothing
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fromValue v = fromValueMay v >>= \case
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Just b -> pure b
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_ -> throwError $ Expectation @t @f @m (TString NoContext) (Free v)
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newtype Path = Path { getPath :: FilePath }
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deriving Show
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instance ( Convertible e t f m
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, MonadValue (NValue t f m) m
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)
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=> FromValue Path m (NValue' t f m (NValue t f m)) where
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fromValueMay = \case
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NVPath' p -> pure $ Just (Path p)
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NVStr' ns -> pure $ Path . Text.unpack <$> hackyGetStringNoContext ns
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NVSet' s _ -> case M.lookup "outPath" s of
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Nothing -> pure Nothing
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Just p -> fromValueMay @Path p
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_ -> pure Nothing
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fromValue v = fromValueMay v >>= \case
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Just b -> pure b
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_ -> throwError $ Expectation @t @f @m TPath (Free v)
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instance Convertible e t f m
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=> FromValue [NValue t f m] m (NValue' t f m (NValue t f m)) where
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fromValueMay = \case
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NVList' l -> pure $ Just l
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_ -> pure Nothing
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fromValue v = fromValueMay v >>= \case
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Just b -> pure b
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_ -> throwError $ Expectation @t @f @m TList (Free v)
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instance ( Convertible e t f m
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, FromValue a m (NValue t f m)
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)
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=> FromValue [a] m (Deeper (NValue' t f m (NValue t f m))) where
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fromValueMay = \case
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Deeper (NVList' l) -> sequence <$> traverse fromValueMay l
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_ -> pure Nothing
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fromValue v = fromValueMay v >>= \case
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Just b -> pure b
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_ -> throwError $ Expectation @t @f @m TList (Free (getDeeper v))
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instance Convertible e t f m
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=> FromValue (AttrSet (NValue t f m)) m (NValue' t f m (NValue t f m)) where
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fromValueMay = \case
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NVSet' s _ -> pure $ Just s
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_ -> pure Nothing
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fromValue v = fromValueMay v >>= \case
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Just b -> pure b
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_ -> throwError $ Expectation @t @f @m TSet (Free v)
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instance ( Convertible e t f m
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, FromValue a m (NValue t f m)
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)
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=> FromValue (AttrSet a) m (Deeper (NValue' t f m (NValue t f m))) where
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fromValueMay = \case
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Deeper (NVSet' s _) -> sequence <$> traverse fromValueMay s
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_ -> pure Nothing
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fromValue v = fromValueMay v >>= \case
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Just b -> pure b
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_ -> throwError $ Expectation @t @f @m TSet (Free (getDeeper v))
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instance Convertible e t f m
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=> FromValue (AttrSet (NValue t f m), AttrSet SourcePos) m
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(NValue' t f m (NValue t f m)) where
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fromValueMay = \case
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NVSet' s p -> pure $ Just (s, p)
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_ -> pure Nothing
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fromValue v = fromValueMay v >>= \case
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Just b -> pure b
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_ -> throwError $ Expectation @t @f @m TSet (Free v)
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instance ( Convertible e t f m
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, FromValue a m (NValue t f m)
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)
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=> FromValue (AttrSet a, AttrSet SourcePos) m
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(Deeper (NValue' t f m (NValue t f m))) where
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fromValueMay = \case
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Deeper (NVSet' s p) -> fmap (, p) <$> sequence <$> traverse fromValueMay s
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_ -> pure Nothing
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fromValue v = fromValueMay v >>= \case
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Just b -> pure b
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_ -> throwError $ Expectation @t @f @m TSet (Free (getDeeper v))
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-- This instance needs IncoherentInstances, and only because of ToBuiltin
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instance ( Convertible e t f m
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, FromValue a m (NValue' t f m (NValue t f m))
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)
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=> FromValue a m (Deeper (NValue' t f m (NValue t f m))) where
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fromValueMay = fromValueMay . getDeeper
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fromValue = fromValue . getDeeper
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{-----------------------------------------------------------------------
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ToValue
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-----------------------------------------------------------------------}
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class ToValue a m v where
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toValue :: a -> m v
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instance (Convertible e t f m, ToValue a m (NValue' t f m (NValue t f m)))
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=> ToValue a m (NValue t f m) where
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toValue = fmap Free . toValue
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instance ( Convertible e t f m
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, ToValue a m (Deeper (NValue' t f m (NValue t f m)))
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)
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=> ToValue a m (Deeper (NValue t f m)) where
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toValue = fmap (fmap Free) . toValue
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instance Convertible e t f m
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=> ToValue () m (NValue' t f m (NValue t f m)) where
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toValue _ = pure . nvConstant' $ NNull
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instance Convertible e t f m
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=> ToValue Bool m (NValue' t f m (NValue t f m)) where
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toValue = pure . nvConstant' . NBool
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instance Convertible e t f m
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=> ToValue Int m (NValue' t f m (NValue t f m)) where
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toValue = pure . nvConstant' . NInt . toInteger
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instance Convertible e t f m
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=> ToValue Integer m (NValue' t f m (NValue t f m)) where
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toValue = pure . nvConstant' . NInt
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instance Convertible e t f m
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=> ToValue Float m (NValue' t f m (NValue t f m)) where
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toValue = pure . nvConstant' . NFloat
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instance Convertible e t f m
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=> ToValue NixString m (NValue' t f m (NValue t f m)) where
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toValue = pure . nvStr'
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instance Convertible e t f m
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=> ToValue ByteString m (NValue' t f m (NValue t f m)) where
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toValue = pure . nvStr' . hackyMakeNixStringWithoutContext . decodeUtf8
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instance Convertible e t f m
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=> ToValue Path m (NValue' t f m (NValue t f m)) where
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toValue = pure . nvPath' . getPath
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instance Convertible e t f m
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=> ToValue StorePath m (NValue' t f m (NValue t f m)) where
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toValue = toValue . Path . unStorePath
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instance ( Convertible e t f m
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)
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=> ToValue SourcePos m (NValue' t f m (NValue t f m)) where
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toValue (SourcePos f l c) = do
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f' <- toValue (principledMakeNixStringWithoutContext (Text.pack f))
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l' <- toValue (unPos l)
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c' <- toValue (unPos c)
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let pos = M.fromList [("file" :: Text, f'), ("line", l'), ("column", c')]
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pure $ nvSet' pos mempty
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-- | With 'ToValue', we can always act recursively
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instance Convertible e t f m
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=> ToValue [NValue t f m] m (NValue' t f m (NValue t f m)) where
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toValue = pure . nvList'
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instance (Convertible e t f m, ToValue a m (NValue t f m))
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=> ToValue [a] m (Deeper (NValue' t f m (NValue t f m))) where
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toValue = fmap (Deeper . nvList') . traverse toValue
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instance Convertible e t f m
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=> ToValue (AttrSet (NValue t f m)) m (NValue' t f m (NValue t f m)) where
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toValue s = pure $ nvSet' s mempty
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instance (Convertible e t f m, ToValue a m (NValue t f m))
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=> ToValue (AttrSet a) m (Deeper (NValue' t f m (NValue t f m))) where
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toValue s = (Deeper .) . nvSet' <$> traverse toValue s <*> pure mempty
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instance Convertible e t f m
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=> ToValue (AttrSet (NValue t f m), AttrSet SourcePos) m
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(NValue' t f m (NValue t f m)) where
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toValue (s, p) = pure $ nvSet' s p
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instance (Convertible e t f m, ToValue a m (NValue t f m))
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=> ToValue (AttrSet a, AttrSet SourcePos) m
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(Deeper (NValue' t f m (NValue t f m))) where
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toValue (s, p) = (Deeper .) . nvSet' <$> traverse toValue s <*> pure p
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instance Convertible e t f m
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=> ToValue NixLikeContextValue m (NValue' t f m (NValue t f m)) where
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toValue nlcv = do
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path <- if nlcvPath nlcv then Just <$> toValue True else return Nothing
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allOutputs <- if nlcvAllOutputs nlcv
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then Just <$> toValue True
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else return Nothing
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outputs <- do
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let outputs =
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fmap principledMakeNixStringWithoutContext $ nlcvOutputs nlcv
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ts :: [NValue t f m] <- traverse toValue outputs
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case ts of
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[] -> return Nothing
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_ -> Just <$> toValue ts
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pure $ flip nvSet' M.empty $ M.fromList $ catMaybes
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[ (\p -> ("path", p)) <$> path
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, (\ao -> ("allOutputs", ao)) <$> allOutputs
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, (\os -> ("outputs", os)) <$> outputs
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]
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instance Convertible e t f m => ToValue () m (NExprF (NValue t f m)) where
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toValue _ = pure . NConstant $ NNull
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instance Convertible e t f m => ToValue Bool m (NExprF (NValue t f m)) where
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toValue = pure . NConstant . NBool
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