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--------------------------------------------------------------------------------
-- | Internally used compiler module
{-# LANGUAGE GADTs #-}
{-# LANGUAGE GeneralizedNewtypeDeriving #-}
module Hakyll.Core.Compiler.Internal
( CompilerRead (..)
, Compiler (..)
, compilerTell
, compilerAsk
, compilerThrow
, compilerCatch
) where
--------------------------------------------------------------------------------
import Control.Applicative (Alternative (..),
Applicative (..))
import Data.Monoid (mappend, mempty)
--------------------------------------------------------------------------------
import Hakyll.Core.Dependencies
import Hakyll.Core.Identifier
import Hakyll.Core.Logger
import Hakyll.Core.ResourceProvider
import Hakyll.Core.Routes
import Hakyll.Core.Store
--------------------------------------------------------------------------------
-- | Environment in which a compiler runs
data CompilerRead = CompilerRead
{ -- | Target identifier
compilerIdentifier :: Identifier ()
, -- | Resource provider
compilerResourceProvider :: ResourceProvider
, -- | List of all known identifiers
compilerUniverse :: [Identifier ()]
, -- | Site routes
compilerRoutes :: Routes
, -- | Compiler store
compilerStore :: Store
, -- | Flag indicating if the underlying resource was modified
compilerResourceModified :: Bool
, -- | Logger
compilerLogger :: Logger
}
--------------------------------------------------------------------------------
type CompilerWrite = [Dependency]
--------------------------------------------------------------------------------
data CompilerResult a where
CompilerDone :: a -> CompilerWrite -> CompilerResult a
CompilerError :: String -> CompilerResult a
CompilerRequire :: Identifier b -> (b -> Compiler a) -> CompilerResult a
--------------------------------------------------------------------------------
newtype Compiler a = Compiler
{ unCompiler :: CompilerRead -> IO (CompilerResult a)
}
--------------------------------------------------------------------------------
instance Functor Compiler where
fmap f (Compiler c) = Compiler $ \r -> do
res <- c r
return $ case res of
CompilerDone x w -> CompilerDone (f x) w
CompilerError e -> CompilerError e
CompilerRequire i g -> CompilerRequire i (\x -> fmap f (g x))
{-# INLINE fmap #-}
--------------------------------------------------------------------------------
instance Monad Compiler where
return x = Compiler $ \_ -> return $ CompilerDone x mempty
{-# INLINE return #-}
Compiler c >>= f = Compiler $ \r -> do
res <- c r
case res of
CompilerDone x w -> do
res' <- unCompiler (f x) r
return $ case res' of
CompilerDone y w' -> CompilerDone y (w `mappend` w')
CompilerError e -> CompilerError e
CompilerRequire i g -> CompilerRequire i $ \z -> do
compilerTell w -- Save dependencies!
g z
CompilerError e -> return $ CompilerError e
CompilerRequire i g -> return $ CompilerRequire i $ \z -> g z >>= f
{-# INLINE (>>=) #-}
--------------------------------------------------------------------------------
instance Applicative Compiler where
pure x = return x
{-# INLINE pure #-}
f <*> x = f >>= \f' -> fmap f' x
{-# INLINE (<*>) #-}
--------------------------------------------------------------------------------
instance Alternative Compiler where
empty = compilerThrow "Hakyll.Core.Compiler.Internal: empty alternative"
x <|> y = compilerCatch x (\_ -> y)
{-# INLINE (<|>) #-}
--------------------------------------------------------------------------------
compilerAsk :: Compiler CompilerRead
compilerAsk = Compiler $ \r -> return $ CompilerDone r mempty
{-# INLINE compilerAsk #-}
--------------------------------------------------------------------------------
compilerTell :: [Dependency] -> Compiler ()
compilerTell deps = Compiler $ \_ -> return $ CompilerDone () deps
{-# INLINE compilerTell #-}
--------------------------------------------------------------------------------
compilerThrow :: String -> Compiler a
compilerThrow e = Compiler $ \_ -> return $ CompilerError e
{-# INLINE compilerThrow #-}
--------------------------------------------------------------------------------
compilerCatch :: Compiler a -> (String -> Compiler a) -> Compiler a
compilerCatch (Compiler x) f = Compiler $ \r -> do
res <- x r
case res of
CompilerError e -> unCompiler (f e) r
_ -> return res
{-# INLINE compilerCatch #-}
{-
--------------------------------------------------------------------------------
-- | The compiler monad
newtype CompilerM a = CompilerM
{ unCompilerM :: ErrorT String (ReaderT CompilerEnvironment IO) a
} deriving (Monad, Functor, Applicative)
--------------------------------------------------------------------------------
-- | The compiler arrow
data Compiler a = Compiler
{ compilerDependencies :: Reader DependencyEnvironment Dependencies
, compilerJob :: CompilerM a
}
--------------------------------------------------------------------------------
instance Functor Compiler where
fmap f (Compiler d j) = Compiler d $ fmap f j
{-# INLINE fmap #-}
--------------------------------------------------------------------------------
instance Applicative Compiler where
pure = fromJob . return
{-# INLINE pure #-}
Compiler d1 j1 <*> Compiler d2 j2 =
Compiler (liftM2 S.union d1 d2) $ j1 <*> j2
{-# INLINE (<*>) #-}
-}
|
