522 lines
19 KiB
Haskell
522 lines
19 KiB
Haskell
{-# LANGUAGE AllowAmbiguousTypes #-}
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{-# LANGUAGE ConstraintKinds #-}
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{-# LANGUAGE DefaultSignatures #-}
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{-# LANGUAGE FlexibleContexts #-}
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{-# LANGUAGE FlexibleInstances #-}
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{-# LANGUAGE LambdaCase #-}
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{-# LANGUAGE MonoLocalBinds #-}
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{-# LANGUAGE MultiParamTypeClasses #-}
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{-# LANGUAGE MultiWayIf #-}
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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 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
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import Control.Monad.Free
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import Data.ByteString
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import Data.HashMap.Lazy (HashMap)
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import qualified Data.HashMap.Lazy as M
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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, decodeUtf8)
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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.Thunk
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import Nix.Utils
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import Nix.Value
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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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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 m = (Framed e m, MonadVar m, Typeable m)
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instance Convertible e m => FromValue () m (NValueNF m) where
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fromValueMay = \case
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Free (NVConstantF 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 $ ExpectationNF TNull v
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instance Convertible e m
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=> FromValue () m (NValue 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 TNull v
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instance Convertible e m
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=> FromValue Bool m (NValueNF m) where
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fromValueMay = \case
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Free (NVConstantF (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 $ ExpectationNF TBool v
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instance Convertible e m
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=> FromValue Bool m (NValue 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 TBool v
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instance Convertible e m
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=> FromValue Int m (NValueNF m) where
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fromValueMay = \case
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Free (NVConstantF (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 $ ExpectationNF TInt v
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instance Convertible e m
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=> FromValue Int m (NValue 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 TInt v
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instance Convertible e m
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=> FromValue Integer m (NValueNF m) where
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fromValueMay = \case
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Free (NVConstantF (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 $ ExpectationNF TInt v
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instance Convertible e m
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=> FromValue Integer m (NValue 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 TInt v
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instance Convertible e m
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=> FromValue Float m (NValueNF m) where
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fromValueMay = \case
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Free (NVConstantF (NFloat b)) -> pure $ Just b
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Free (NVConstantF (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 $ ExpectationNF TFloat v
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instance Convertible e m
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=> FromValue Float m (NValue 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 TFloat v
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instance (Convertible e m, MonadEffects m)
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=> FromValue NixString m (NValueNF m) where
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fromValueMay = \case
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Free (NVStrF ns) -> pure $ Just ns
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Free (NVPathF p) -> Just . hackyMakeNixStringWithoutContext . Text.pack . unStorePath <$> addPath p
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Free (NVSetF 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 $ ExpectationNF (TString NoContext) v
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instance (Convertible e m, MonadThunk (NValue m) (NThunk m) m, MonadEffects m)
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=> FromValue NixString m (NValue m) where
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fromValueMay = \case
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NVStr ns -> pure $ Just ns
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NVPath p -> Just . hackyMakeNixStringWithoutContext . Text.pack . unStorePath <$> 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 (TString NoContext) v
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instance Convertible e m
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=> FromValue ByteString m (NValueNF m) where
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fromValueMay = \case
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Free (NVStrF 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 $ ExpectationNF (TString NoContext) v
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instance Convertible e m
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=> FromValue ByteString m (NValue 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 (TString NoContext) v
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newtype Path = Path { getPath :: FilePath }
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deriving Show
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instance Convertible e m => FromValue Path m (NValueNF m) where
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fromValueMay = \case
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Free (NVPathF p) -> pure $ Just (Path p)
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Free (NVStrF ns) -> pure $ Path . Text.unpack <$> hackyGetStringNoContext ns
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Free (NVSetF 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 $ ExpectationNF TPath v
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instance (Convertible e m, MonadThunk (NValue m) (NThunk m) m)
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=> FromValue Path m (NValue 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 TPath v
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instance (Convertible e m, FromValue a m (NValueNF m), Show a)
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=> FromValue [a] m (NValueNF m) where
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fromValueMay = \case
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Free (NVListF 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 $ ExpectationNF TList v
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instance Convertible e m => FromValue [NThunk m] m (NValue 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 TList v
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instance Convertible e m
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=> FromValue (HashMap Text (NValueNF m)) m (NValueNF m) where
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fromValueMay = \case
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Free (NVSetF 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 $ ExpectationNF TSet v
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instance Convertible e m
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=> FromValue (HashMap Text (NThunk m)) m (NValue 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 TSet v
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instance Convertible e m
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=> FromValue (HashMap Text (NValueNF m),
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HashMap Text SourcePos) m (NValueNF m) where
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fromValueMay = \case
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Free (NVSetF 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 $ ExpectationNF TSet v
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instance Convertible e m
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=> FromValue (HashMap Text (NThunk m),
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HashMap Text SourcePos) m (NValue 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 TSet v
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instance (Convertible e m, MonadThunk (NValue m) (NThunk m) m)
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=> FromValue (NThunk m) m (NValue m) where
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fromValueMay = pure . Just . value @_ @_ @m
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fromValue v = fromValueMay v >>= \case
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Just b -> pure b
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_ -> error "Impossible, see fromValueMay"
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instance (Monad m, FromValue a m v) => FromValue a m (m v) where
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fromValueMay = (>>= fromValueMay)
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fromValue = (>>= fromValue)
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instance (MonadThunk (NValue m) (NThunk m) m, FromValue a m (NValue m))
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=> FromValue a m (NThunk m) where
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fromValueMay = force ?? fromValueMay
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fromValue = force ?? fromValue
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class ToValue a m v where
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toValue :: a -> m v
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instance Applicative m => ToValue () m (NValueNF m) where
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toValue _ = pure . Free . NVConstantF $ NNull
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instance Applicative m => ToValue () m (NValue m) where
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toValue _ = pure . nvConstant $ NNull
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instance Applicative m => ToValue Bool m (NValueNF m) where
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toValue = pure . Free . NVConstantF . NBool
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instance Applicative m => ToValue Bool m (NValue m) where
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toValue = pure . nvConstant . NBool
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instance Applicative m => ToValue Int m (NValueNF m) where
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toValue = pure . Free . NVConstantF . NInt . toInteger
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instance Applicative m => ToValue Int m (NValue m) where
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toValue = pure . nvConstant . NInt . toInteger
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instance Applicative m => ToValue Integer m (NValueNF m) where
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toValue = pure . Free . NVConstantF . NInt
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instance Applicative m => ToValue Integer m (NValue m) where
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toValue = pure . nvConstant . NInt
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instance Applicative m => ToValue Float m (NValueNF m) where
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toValue = pure . Free . NVConstantF . NFloat
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instance Applicative m => ToValue Float m (NValue m) where
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toValue = pure . nvConstant . NFloat
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instance Applicative m => ToValue NixString m (NValueNF m) where
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toValue = pure . Free . NVStrF
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instance Applicative m => ToValue NixString m (NValue m) where
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toValue = pure . nvStr
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instance Applicative m => ToValue ByteString m (NValueNF m) where
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toValue = pure . Free . NVStrF . hackyMakeNixStringWithoutContext . decodeUtf8
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instance Applicative m => ToValue ByteString m (NValue m) where
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toValue = pure . nvStr . hackyMakeNixStringWithoutContext . decodeUtf8
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instance Applicative m => ToValue Path m (NValueNF m) where
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toValue = pure . Free . NVPathF . getPath
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instance Applicative m => ToValue Path m (NValue m) where
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toValue = pure . nvPath . getPath
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instance Applicative m => ToValue StorePath m (NValueNF m) where
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toValue = toValue . Path . unStorePath
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instance Applicative m => ToValue StorePath m (NValue m) where
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toValue = toValue . Path . unStorePath
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instance MonadThunk (NValue m) (NThunk m) m
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=> ToValue SourcePos m (NValue m) where
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toValue (SourcePos f l c) = do
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f' <- pure $ nvStr $ 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
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[ ("file" :: Text, value @_ @_ @m f')
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, ("line", value @_ @_ @m l')
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, ("column", value @_ @_ @m c') ]
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pure $ nvSet pos mempty
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instance (ToValue a m (NValueNF m), Applicative m)
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=> ToValue [a] m (NValueNF m) where
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toValue = fmap (Free . NVListF) . traverse toValue
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instance Applicative m => ToValue [NThunk m] m (NValue m) where
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toValue = pure . nvList
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instance Applicative m
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=> ToValue (HashMap Text (NValueNF m)) m (NValueNF m) where
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toValue = pure . Free . flip NVSetF M.empty
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instance Applicative m => ToValue (HashMap Text (NThunk m)) m (NValue m) where
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toValue = pure . flip nvSet M.empty
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instance Applicative m => ToValue (HashMap Text (NValueNF m),
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HashMap Text SourcePos) m (NValueNF m) where
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toValue (s, p) = pure $ Free $ NVSetF s p
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instance Applicative m => ToValue (HashMap Text (NThunk m),
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HashMap Text SourcePos) m (NValue m) where
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toValue (s, p) = pure $ nvSet s p
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instance (MonadThunk (NValue m) (NThunk m) m, ToValue a m (NValue m))
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=> ToValue a m (NThunk m) where
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toValue = fmap (value @(NValue m) @_ @m) . toValue
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instance Applicative m => ToValue Bool m (NExprF r) where
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toValue = pure . NConstant . NBool
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instance Applicative m => ToValue () m (NExprF r) where
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toValue _ = pure . NConstant $ NNull
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whileForcingThunk :: forall s e m r. (Framed e m, Exception s, Typeable m)
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=> s -> m r -> m r
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whileForcingThunk frame =
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withFrame Debug (ForcingThunk @m) . withFrame Debug frame
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class FromNix a m v where
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fromNix :: v -> m a
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default fromNix :: FromValue a m v => v -> m a
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fromNix = fromValue
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fromNixMay :: v -> m (Maybe a)
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default fromNixMay :: FromValue a m v => v -> m (Maybe a)
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fromNixMay = fromValueMay
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instance (Convertible e m, MonadThunk (NValue m) (NThunk m) m,
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FromNix a m (NValue m))
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=> FromNix [a] m (NValue m) where
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fromNixMay = \case
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NVList l -> sequence <$> traverse (`force` fromNixMay) l
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_ -> pure Nothing
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fromNix v = fromNixMay v >>= \case
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Just b -> pure b
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_ -> throwError $ Expectation TList v
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instance (Convertible e m, MonadThunk (NValue m) (NThunk m) m,
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FromNix a m (NValue m))
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=> FromNix (HashMap Text a) m (NValue m) where
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fromNixMay = \case
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NVSet s _ -> sequence <$> traverse (`force` fromNixMay) s
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_ -> pure Nothing
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fromNix v = fromNixMay v >>= \case
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Just b -> pure b
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_ -> throwError $ Expectation TSet v
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instance Convertible e m => FromNix () m (NValueNF m) where
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instance Convertible e m => FromNix () m (NValue m) where
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instance Convertible e m => FromNix Bool m (NValueNF m) where
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instance Convertible e m => FromNix Bool m (NValue m) where
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instance Convertible e m => FromNix Int m (NValueNF m) where
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instance Convertible e m => FromNix Int m (NValue m) where
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instance Convertible e m => FromNix Integer m (NValueNF m) where
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instance Convertible e m => FromNix Integer m (NValue m) where
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instance Convertible e m => FromNix Float m (NValueNF m) where
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instance Convertible e m => FromNix Float m (NValue m) where
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instance (Convertible e m, MonadEffects m) => FromNix NixString m (NValueNF m) where
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instance (Convertible e m, MonadEffects m, MonadThunk (NValue m) (NThunk m) m) => FromNix NixString m (NValue m) where
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instance Convertible e m => FromNix ByteString m (NValueNF m) where
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instance Convertible e m => FromNix ByteString m (NValue m) where
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instance Convertible e m => FromNix Path m (NValueNF m) where
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instance (Convertible e m, MonadThunk (NValue m) (NThunk m) m) => FromNix Path m (NValue m) where
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instance (Convertible e m, FromValue a m (NValueNF m), Show a) => FromNix [a] m (NValueNF m) where
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instance Convertible e m => FromNix (HashMap Text (NValueNF m)) m (NValueNF m) where
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instance Convertible e m => FromNix (HashMap Text (NValueNF m), HashMap Text SourcePos) m (NValueNF m) where
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instance Convertible e m => FromNix (HashMap Text (NThunk m), HashMap Text SourcePos) m (NValue m) where
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instance (Monad m, FromNix a m v) => FromNix a m (m v) where
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fromNixMay = (>>= fromNixMay)
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fromNix = (>>= fromNix)
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instance (MonadThunk (NValue m) (NThunk m) m, FromNix a m (NValue m))
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=> FromNix a m (NThunk m) where
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fromNixMay = force ?? fromNixMay
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fromNix = force ?? fromNix
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instance MonadThunk (NValue m) (NThunk m) m
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=> FromNix (NThunk m) m (NValue m) where
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fromNixMay = pure . Just . value
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fromNix = pure . value
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class ToNix a m v where
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toNix :: a -> m v
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default toNix :: ToValue a m v => a -> m v
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toNix = toValue
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instance (Convertible e m, MonadThunk (NValue m) (NThunk m) m,
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ToNix a m (NValue m))
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=> ToNix [a] m (NValue m) where
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toNix = fmap nvList
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. traverse (thunk . ((\v -> whileForcingThunk (ConcerningValue v) (pure v))
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<=< toNix))
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instance (Convertible e m, MonadThunk (NValue m) (NThunk m) m,
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ToNix a m (NValue m))
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=> ToNix (HashMap Text a) m (NValue m) where
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toNix = fmap (flip nvSet M.empty)
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. traverse (thunk . ((\v -> whileForcingThunk (ConcerningValue v) (pure v))
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<=< toNix))
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instance Applicative m => ToNix () m (NValueNF m) where
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instance Applicative m => ToNix () m (NValue m) where
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instance Applicative m => ToNix Bool m (NValueNF m) where
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instance Applicative m => ToNix Bool m (NValue m) where
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instance Applicative m => ToNix Int m (NValueNF m) where
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instance Applicative m => ToNix Int m (NValue m) where
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instance Applicative m => ToNix Integer m (NValueNF m) where
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instance Applicative m => ToNix Integer m (NValue m) where
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instance Applicative m => ToNix Float m (NValueNF m) where
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instance Applicative m => ToNix Float m (NValue m) where
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instance Applicative m => ToNix NixString m (NValueNF m) where
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instance Applicative m => ToNix NixString m (NValue m) where
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instance Applicative m => ToNix ByteString m (NValueNF m) where
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instance Applicative m => ToNix ByteString m (NValue m) where
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instance Applicative m => ToNix Path m (NValueNF m) where
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instance Applicative m => ToNix Path m (NValue m) where
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instance Applicative m => ToNix (HashMap Text (NValueNF m)) m (NValueNF m) where
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instance Applicative m => ToNix (HashMap Text (NValueNF m), HashMap Text SourcePos) m (NValueNF m) where
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instance Applicative m => ToNix (HashMap Text (NThunk m), HashMap Text SourcePos) m (NValue m) where
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instance Applicative m => ToNix Bool m (NExprF r) where
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instance Applicative m => ToNix () m (NExprF r) where
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instance (MonadThunk (NValue m) (NThunk m) m, ToNix a m (NValue m))
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=> ToNix a m (NThunk m) where
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toNix = thunk . toNix
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instance (Applicative m, ToNix a m (NValueNF m)) => ToNix [a] m (NValueNF m) where
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toNix = fmap (Free . NVListF) . traverse toNix
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instance MonadThunk (NValue m) (NThunk m) m => ToNix (NThunk m) m (NValue m) where
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toNix = force ?? pure
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convertNix :: forall a t m v. (FromNix a m t, ToNix a m v, Monad m) => t -> m v
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convertNix = fromNix @a >=> toNix
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