{-# LANGUAGE TemplateHaskell #-}
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE TypeFamilies #-}
{-# LANGUAGE FlexibleInstances #-}
{-# LANGUAGE MultiParamTypeClasses #-}
{-# LANGUAGE FlexibleContexts #-}
module Yesod.Core.Internal.TH where

import Prelude hiding (exp)
import Yesod.Core.Handler

import Language.Haskell.TH hiding (cxt, instanceD)
import Language.Haskell.TH.Syntax

import qualified Network.Wai as W

import Data.ByteString.Lazy.Char8 ()
import Data.List (foldl')
import Control.Monad (replicateM, void)
import Text.Parsec (parse, many1, many, eof, try, option, sepBy1)
import Text.ParserCombinators.Parsec.Char (alphaNum, spaces, string, char)

import Yesod.Routes.TH
import Yesod.Routes.Parse
import Yesod.Core.Types
import Yesod.Core.Class.Dispatch
import Yesod.Core.Internal.Run

-- | Generates URL datatype and site function for the given 'Resource's. This
-- is used for creating sites, /not/ subsites. See 'mkYesodSubData' and 'mkYesodSubDispatch' for the latter.
-- Use 'parseRoutes' to create the 'Resource's.
--
-- Contexts and type variables in the name of the datatype are parsed. 
-- For example, a datatype @App a@ with typeclass constraint @MyClass a@ can be written as @\"(MyClass a) => App a\"@.
mkYesod :: String -- ^ name of the argument datatype
        -> [ResourceTree String]
        -> Q [Dec]
mkYesod :: String -> [ResourceTree String] -> Q [Dec]
mkYesod String
name = (([Dec], [Dec]) -> [Dec]) -> Q ([Dec], [Dec]) -> Q [Dec]
forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
fmap (([Dec] -> [Dec] -> [Dec]) -> ([Dec], [Dec]) -> [Dec]
forall a b c. (a -> b -> c) -> (a, b) -> c
uncurry [Dec] -> [Dec] -> [Dec]
forall a. [a] -> [a] -> [a]
(++)) (Q ([Dec], [Dec]) -> Q [Dec])
-> ([ResourceTree String] -> Q ([Dec], [Dec]))
-> [ResourceTree String]
-> Q [Dec]
forall b c a. (b -> c) -> (a -> b) -> a -> c
. String
-> Bool
-> (Exp -> Q Exp)
-> [ResourceTree String]
-> Q ([Dec], [Dec])
mkYesodWithParser String
name Bool
False Exp -> Q Exp
forall (m :: * -> *) a. Monad m => a -> m a
return

{-# DEPRECATED mkYesodWith "Contexts and type variables are now parsed from the name in `mkYesod`. <https://github.com/yesodweb/yesod/pull/1366>" #-}
-- | Similar to 'mkYesod', except contexts and type variables are not parsed. 
-- Instead, they are explicitly provided. 
-- You can write @(MyClass a) => App a@ with @mkYesodWith [[\"MyClass\",\"a\"]] \"App\" [\"a\"] ...@.
mkYesodWith :: [[String]] -- ^ list of contexts
            -> String -- ^ name of the argument datatype
            -> [String] -- ^ list of type variables
            -> [ResourceTree String]
            -> Q [Dec]
mkYesodWith :: [[String]]
-> String -> [String] -> [ResourceTree String] -> Q [Dec]
mkYesodWith [[String]]
cxts String
name [String]
args = (([Dec], [Dec]) -> [Dec]) -> Q ([Dec], [Dec]) -> Q [Dec]
forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
fmap (([Dec] -> [Dec] -> [Dec]) -> ([Dec], [Dec]) -> [Dec]
forall a b c. (a -> b -> c) -> (a, b) -> c
uncurry [Dec] -> [Dec] -> [Dec]
forall a. [a] -> [a] -> [a]
(++)) (Q ([Dec], [Dec]) -> Q [Dec])
-> ([ResourceTree String] -> Q ([Dec], [Dec]))
-> [ResourceTree String]
-> Q [Dec]
forall b c a. (b -> c) -> (a -> b) -> a -> c
. [[String]]
-> String
-> [String]
-> Bool
-> (Exp -> Q Exp)
-> [ResourceTree String]
-> Q ([Dec], [Dec])
mkYesodGeneral [[String]]
cxts String
name [String]
args Bool
False Exp -> Q Exp
forall (m :: * -> *) a. Monad m => a -> m a
return

-- | Sometimes, you will want to declare your routes in one file and define
-- your handlers elsewhere. For example, this is the only way to break up a
-- monolithic file into smaller parts. Use this function, paired with
-- 'mkYesodDispatch', to do just that.
mkYesodData :: String -> [ResourceTree String] -> Q [Dec]
mkYesodData :: String -> [ResourceTree String] -> Q [Dec]
mkYesodData String
name [ResourceTree String]
resS = ([Dec], [Dec]) -> [Dec]
forall a b. (a, b) -> a
fst (([Dec], [Dec]) -> [Dec]) -> Q ([Dec], [Dec]) -> Q [Dec]
forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
<$> String
-> Bool
-> (Exp -> Q Exp)
-> [ResourceTree String]
-> Q ([Dec], [Dec])
mkYesodWithParser String
name Bool
False Exp -> Q Exp
forall (m :: * -> *) a. Monad m => a -> m a
return [ResourceTree String]
resS

mkYesodSubData :: String -> [ResourceTree String] -> Q [Dec]
mkYesodSubData :: String -> [ResourceTree String] -> Q [Dec]
mkYesodSubData String
name [ResourceTree String]
resS = ([Dec], [Dec]) -> [Dec]
forall a b. (a, b) -> a
fst (([Dec], [Dec]) -> [Dec]) -> Q ([Dec], [Dec]) -> Q [Dec]
forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
<$> String
-> Bool
-> (Exp -> Q Exp)
-> [ResourceTree String]
-> Q ([Dec], [Dec])
mkYesodWithParser String
name Bool
True Exp -> Q Exp
forall (m :: * -> *) a. Monad m => a -> m a
return [ResourceTree String]
resS

-- | Parses contexts and type arguments out of name before generating TH.
mkYesodWithParser :: String                    -- ^ foundation type
                  -> Bool                      -- ^ is this a subsite
                  -> (Exp -> Q Exp)            -- ^ unwrap handler
                  -> [ResourceTree String]
                  -> Q([Dec],[Dec])
mkYesodWithParser :: String
-> Bool
-> (Exp -> Q Exp)
-> [ResourceTree String]
-> Q ([Dec], [Dec])
mkYesodWithParser String
name Bool
isSub Exp -> Q Exp
f [ResourceTree String]
resS = do
    let (String
name', [String]
rest, [[String]]
cxt) = case Parsec String () (String, [String], [[String]])
-> String
-> String
-> Either ParseError (String, [String], [[String]])
forall s t a.
Stream s Identity t =>
Parsec s () a -> String -> s -> Either ParseError a
parse Parsec String () (String, [String], [[String]])
parseName String
"" String
name of
            Left ParseError
err -> String -> (String, [String], [[String]])
forall a. HasCallStack => String -> a
error (String -> (String, [String], [[String]]))
-> String -> (String, [String], [[String]])
forall a b. (a -> b) -> a -> b
$ ParseError -> String
forall a. Show a => a -> String
show ParseError
err
            Right (String, [String], [[String]])
a -> (String, [String], [[String]])
a
    [[String]]
-> String
-> [String]
-> Bool
-> (Exp -> Q Exp)
-> [ResourceTree String]
-> Q ([Dec], [Dec])
mkYesodGeneral [[String]]
cxt String
name' [String]
rest Bool
isSub Exp -> Q Exp
f [ResourceTree String]
resS

    where
        parseName :: Parsec String () (String, [String], [[String]])
parseName = do
            [[String]]
cxt <- [[String]]
-> ParsecT String () Identity [[String]]
-> ParsecT String () Identity [[String]]
forall s (m :: * -> *) t a u.
Stream s m t =>
a -> ParsecT s u m a -> ParsecT s u m a
option [] ParsecT String () Identity [[String]]
parseContext
            String
name' <- ParsecT String () Identity String
forall u. ParsecT String u Identity String
parseWord
            [String]
args <- ParsecT String () Identity String
-> ParsecT String () Identity [String]
forall s u (m :: * -> *) a. ParsecT s u m a -> ParsecT s u m [a]
many ParsecT String () Identity String
forall u. ParsecT String u Identity String
parseWord
            ParsecT String () Identity ()
forall s (m :: * -> *) u. Stream s m Char => ParsecT s u m ()
spaces
            ParsecT String () Identity ()
forall s (m :: * -> *) t u.
(Stream s m t, Show t) =>
ParsecT s u m ()
eof
            (String, [String], [[String]])
-> Parsec String () (String, [String], [[String]])
forall (m :: * -> *) a. Monad m => a -> m a
return ( String
name', [String]
args, [[String]]
cxt)

        parseWord :: ParsecT String u Identity String
parseWord = do
            ParsecT String u Identity ()
forall s (m :: * -> *) u. Stream s m Char => ParsecT s u m ()
spaces
            ParsecT String u Identity Char -> ParsecT String u Identity String
forall s (m :: * -> *) t u a.
Stream s m t =>
ParsecT s u m a -> ParsecT s u m [a]
many1 ParsecT String u Identity Char
forall s (m :: * -> *) u. Stream s m Char => ParsecT s u m Char
alphaNum

        parseContext :: ParsecT String () Identity [[String]]
parseContext = ParsecT String () Identity [[String]]
-> ParsecT String () Identity [[String]]
forall s u (m :: * -> *) a. ParsecT s u m a -> ParsecT s u m a
try (ParsecT String () Identity [[String]]
 -> ParsecT String () Identity [[String]])
-> ParsecT String () Identity [[String]]
-> ParsecT String () Identity [[String]]
forall a b. (a -> b) -> a -> b
$ do
            [[String]]
cxts <- ParsecT String () Identity [[String]]
-> ParsecT String () Identity [[String]]
forall s (m :: * -> *) u b.
Stream s m Char =>
ParsecT s u m b -> ParsecT s u m b
parseParen ParsecT String () Identity [[String]]
parseContexts
            ParsecT String () Identity ()
forall s (m :: * -> *) u. Stream s m Char => ParsecT s u m ()
spaces
            String
_ <- String -> ParsecT String () Identity String
forall s (m :: * -> *) u.
Stream s m Char =>
String -> ParsecT s u m String
string String
"=>"
            [[String]] -> ParsecT String () Identity [[String]]
forall (m :: * -> *) a. Monad m => a -> m a
return [[String]]
cxts

        parseParen :: ParsecT s u m b -> ParsecT s u m b
parseParen ParsecT s u m b
p = do
            ParsecT s u m ()
forall s (m :: * -> *) u. Stream s m Char => ParsecT s u m ()
spaces
            Char
_ <- Char -> ParsecT s u m Char
forall s (m :: * -> *) u.
Stream s m Char =>
Char -> ParsecT s u m Char
char Char
'('
            b
r <- ParsecT s u m b
p
            ParsecT s u m ()
forall s (m :: * -> *) u. Stream s m Char => ParsecT s u m ()
spaces
            Char
_ <- Char -> ParsecT s u m Char
forall s (m :: * -> *) u.
Stream s m Char =>
Char -> ParsecT s u m Char
char Char
')'
            b -> ParsecT s u m b
forall (m :: * -> *) a. Monad m => a -> m a
return b
r

        parseContexts :: ParsecT String () Identity [[String]]
parseContexts = 
            ParsecT String () Identity [String]
-> ParsecT String () Identity ()
-> ParsecT String () Identity [[String]]
forall s (m :: * -> *) t u a sep.
Stream s m t =>
ParsecT s u m a -> ParsecT s u m sep -> ParsecT s u m [a]
sepBy1 (ParsecT String () Identity String
-> ParsecT String () Identity [String]
forall s (m :: * -> *) t u a.
Stream s m t =>
ParsecT s u m a -> ParsecT s u m [a]
many1 ParsecT String () Identity String
forall u. ParsecT String u Identity String
parseWord) (ParsecT String () Identity ()
forall s (m :: * -> *) u. Stream s m Char => ParsecT s u m ()
spaces ParsecT String () Identity ()
-> ParsecT String () Identity Char
-> ParsecT String () Identity Char
forall (m :: * -> *) a b. Monad m => m a -> m b -> m b
>> Char -> ParsecT String () Identity Char
forall s (m :: * -> *) u.
Stream s m Char =>
Char -> ParsecT s u m Char
char Char
',' ParsecT String () Identity Char
-> ParsecT String () Identity () -> ParsecT String () Identity ()
forall (m :: * -> *) a b. Monad m => m a -> m b -> m b
>> () -> ParsecT String () Identity ()
forall (m :: * -> *) a. Monad m => a -> m a
return ())

-- | See 'mkYesodData'.
mkYesodDispatch :: String -> [ResourceTree String] -> Q [Dec]
mkYesodDispatch :: String -> [ResourceTree String] -> Q [Dec]
mkYesodDispatch String
name = (([Dec], [Dec]) -> [Dec]) -> Q ([Dec], [Dec]) -> Q [Dec]
forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
fmap ([Dec], [Dec]) -> [Dec]
forall a b. (a, b) -> b
snd (Q ([Dec], [Dec]) -> Q [Dec])
-> ([ResourceTree String] -> Q ([Dec], [Dec]))
-> [ResourceTree String]
-> Q [Dec]
forall b c a. (b -> c) -> (a -> b) -> a -> c
. String
-> Bool
-> (Exp -> Q Exp)
-> [ResourceTree String]
-> Q ([Dec], [Dec])
mkYesodWithParser String
name Bool
False Exp -> Q Exp
forall (m :: * -> *) a. Monad m => a -> m a
return

-- | Get the Handler and Widget type synonyms for the given site.
masterTypeSyns :: [Name] -> Type -> [Dec] -- FIXME remove from here, put into the scaffolding itself?
masterTypeSyns :: [Name] -> Type -> [Dec]
masterTypeSyns [Name]
vs Type
site =
    [ Name -> [TyVarBndr] -> Type -> Dec
TySynD (String -> Name
mkName String
"Handler") ((Name -> TyVarBndr) -> [Name] -> [TyVarBndr]
forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
fmap Name -> TyVarBndr
plainTV [Name]
vs)
      (Type -> Dec) -> Type -> Dec
forall a b. (a -> b) -> a -> b
$ Name -> Type
ConT ''HandlerFor Type -> Type -> Type
`AppT` Type
site
    , Name -> [TyVarBndr] -> Type -> Dec
TySynD (String -> Name
mkName String
"Widget")  ((Name -> TyVarBndr) -> [Name] -> [TyVarBndr]
forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
fmap Name -> TyVarBndr
plainTV [Name]
vs)
      (Type -> Dec) -> Type -> Dec
forall a b. (a -> b) -> a -> b
$ Name -> Type
ConT ''WidgetFor Type -> Type -> Type
`AppT` Type
site Type -> Type -> Type
`AppT` Name -> Type
ConT ''()
    ]

mkYesodGeneral :: [[String]]                -- ^ Appliction context. Used in RenderRoute, RouteAttrs, and ParseRoute instances.
               -> String                    -- ^ foundation type
               -> [String]                  -- ^ arguments for the type
               -> Bool                      -- ^ is this a subsite
               -> (Exp -> Q Exp)            -- ^ unwrap handler
               -> [ResourceTree String]
               -> Q([Dec],[Dec])
mkYesodGeneral :: [[String]]
-> String
-> [String]
-> Bool
-> (Exp -> Q Exp)
-> [ResourceTree String]
-> Q ([Dec], [Dec])
mkYesodGeneral [[String]]
appCxt' String
namestr [String]
mtys Bool
isSub Exp -> Q Exp
f [ResourceTree String]
resS = do
    let appCxt :: [Type]
appCxt = ([String] -> Type) -> [[String]] -> [Type]
forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
fmap (\(String
c:[String]
rest) -> 
            (Type -> String -> Type) -> Type -> [String] -> Type
forall (t :: * -> *) b a.
Foldable t =>
(b -> a -> b) -> b -> t a -> b
foldl' (\Type
acc String
v -> Type
acc Type -> Type -> Type
`AppT` String -> Type
nameToType String
v) (Name -> Type
ConT (Name -> Type) -> Name -> Type
forall a b. (a -> b) -> a -> b
$ String -> Name
mkName String
c) [String]
rest
          ) [[String]]
appCxt'
    Maybe Name
mname <- String -> Q (Maybe Name)
lookupTypeName String
namestr
    Int
arity <- case Maybe Name
mname of
               Just Name
name -> do
                 Info
info <- Name -> Q Info
reify Name
name
                 Int -> Q Int
forall (m :: * -> *) a. Monad m => a -> m a
return (Int -> Q Int) -> Int -> Q Int
forall a b. (a -> b) -> a -> b
$
                   case Info
info of
                     TyConI Dec
dec ->
                       case Dec
dec of
                         DataD [Type]
_ Name
_ [TyVarBndr]
vs Maybe Type
_ [Con]
_ [DerivClause]
_ -> [TyVarBndr] -> Int
forall (t :: * -> *) a. Foldable t => t a -> Int
length [TyVarBndr]
vs
                         NewtypeD [Type]
_ Name
_ [TyVarBndr]
vs Maybe Type
_ Con
_ [DerivClause]
_ -> [TyVarBndr] -> Int
forall (t :: * -> *) a. Foldable t => t a -> Int
length [TyVarBndr]
vs
                         TySynD Name
_ [TyVarBndr]
vs Type
_ -> [TyVarBndr] -> Int
forall (t :: * -> *) a. Foldable t => t a -> Int
length [TyVarBndr]
vs
                         Dec
_ -> Int
0
                     Info
_ -> Int
0
               Maybe Name
_ -> Int -> Q Int
forall (m :: * -> *) a. Monad m => a -> m a
return Int
0
    let name :: Name
name = String -> Name
mkName String
namestr
    -- Generate as many variable names as the arity indicates
    [Name]
vns <- Int -> Q Name -> Q [Name]
forall (m :: * -> *) a. Applicative m => Int -> m a -> m [a]
replicateM (Int
arity Int -> Int -> Int
forall a. Num a => a -> a -> a
- [String] -> Int
forall (t :: * -> *) a. Foldable t => t a -> Int
length [String]
mtys) (Q Name -> Q [Name]) -> Q Name -> Q [Name]
forall a b. (a -> b) -> a -> b
$ String -> Q Name
newName String
"t"
    -- types that you apply to get a concrete site name
    let argtypes :: [Type]
argtypes = (String -> Type) -> [String] -> [Type]
forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
fmap String -> Type
nameToType [String]
mtys [Type] -> [Type] -> [Type]
forall a. [a] -> [a] -> [a]
++ (Name -> Type) -> [Name] -> [Type]
forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
fmap Name -> Type
VarT [Name]
vns
    -- typevars that should appear in synonym head
    let argvars :: [Name]
argvars = ((String -> Name) -> [String] -> [Name]
forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
fmap String -> Name
mkName ([String] -> [Name])
-> ([String] -> [String]) -> [String] -> [Name]
forall b c a. (b -> c) -> (a -> b) -> a -> c
. (String -> Bool) -> [String] -> [String]
forall a. (a -> Bool) -> [a] -> [a]
filter String -> Bool
isTvar) [String]
mtys [Name] -> [Name] -> [Name]
forall a. [a] -> [a] -> [a]
++ [Name]
vns
        -- Base type (site type with variables)
    let site :: Type
site = (Type -> Type -> Type) -> Type -> [Type] -> Type
forall (t :: * -> *) b a.
Foldable t =>
(b -> a -> b) -> b -> t a -> b
foldl' Type -> Type -> Type
AppT (Name -> Type
ConT Name
name) [Type]
argtypes
        res :: [ResourceTree Type]
res = (ResourceTree String -> ResourceTree Type)
-> [ResourceTree String] -> [ResourceTree Type]
forall a b. (a -> b) -> [a] -> [b]
map ((String -> Type) -> ResourceTree String -> ResourceTree Type
forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
fmap (String -> Type
parseType (String -> Type) -> (String -> String) -> String -> Type
forall b c a. (b -> c) -> (a -> b) -> a -> c
. String -> String
dropBracket)) [ResourceTree String]
resS
    [Dec]
renderRouteDec <- [Type] -> Type -> [ResourceTree Type] -> Q [Dec]
mkRenderRouteInstance [Type]
appCxt Type
site [ResourceTree Type]
res
    Dec
routeAttrsDec  <- [Type] -> Type -> [ResourceTree Type] -> Q Dec
forall a. [Type] -> Type -> [ResourceTree a] -> Q Dec
mkRouteAttrsInstance [Type]
appCxt Type
site [ResourceTree Type]
res
    [Dec]
dispatchDec    <- Type -> [Type] -> (Exp -> Q Exp) -> [ResourceTree Type] -> Q [Dec]
forall c.
Type -> [Type] -> (Exp -> Q Exp) -> [ResourceTree c] -> Q [Dec]
mkDispatchInstance Type
site [Type]
appCxt Exp -> Q Exp
f [ResourceTree Type]
res
    Dec
parseRoute <- [Type] -> Type -> [ResourceTree Type] -> Q Dec
forall a. [Type] -> Type -> [ResourceTree a] -> Q Dec
mkParseRouteInstance [Type]
appCxt Type
site [ResourceTree Type]
res
    let rname :: Name
rname = String -> Name
mkName (String -> Name) -> String -> Name
forall a b. (a -> b) -> a -> b
$ String
"resources" String -> String -> String
forall a. [a] -> [a] -> [a]
++ String
namestr
    Exp
eres <- [ResourceTree String] -> Q Exp
forall t. Lift t => t -> Q Exp
lift [ResourceTree String]
resS
    let resourcesDec :: [Dec]
resourcesDec =
            [ Name -> Type -> Dec
SigD Name
rname (Type -> Dec) -> Type -> Dec
forall a b. (a -> b) -> a -> b
$ Type
ListT Type -> Type -> Type
`AppT` (Name -> Type
ConT ''ResourceTree Type -> Type -> Type
`AppT` Name -> Type
ConT ''String)
            , Name -> [Clause] -> Dec
FunD Name
rname [[Pat] -> Body -> [Dec] -> Clause
Clause [] (Exp -> Body
NormalB Exp
eres) []]
            ]
    let dataDec :: [Dec]
dataDec = [[Dec]] -> [Dec]
forall (t :: * -> *) a. Foldable t => t [a] -> [a]
concat
            [ [Dec
parseRoute]
            , [Dec]
renderRouteDec
            , [Dec
routeAttrsDec]
            , [Dec]
resourcesDec
            , if Bool
isSub then [] else [Name] -> Type -> [Dec]
masterTypeSyns [Name]
argvars Type
site
            ]
    ([Dec], [Dec]) -> Q ([Dec], [Dec])
forall (m :: * -> *) a. Monad m => a -> m a
return ([Dec]
dataDec, [Dec]
dispatchDec)

mkMDS :: (Exp -> Q Exp) -> Q Exp -> MkDispatchSettings a site b
mkMDS :: (Exp -> Q Exp) -> Q Exp -> MkDispatchSettings a site b
mkMDS Exp -> Q Exp
f Q Exp
rh = MkDispatchSettings :: forall b site c.
Q Exp
-> Q Exp
-> Q Exp
-> Q Exp
-> Q Exp
-> Q Exp
-> Q Exp
-> (Maybe String -> String -> Q Exp)
-> (Exp -> Q Exp)
-> MkDispatchSettings b site c
MkDispatchSettings
    { mdsRunHandler :: Q Exp
mdsRunHandler = Q Exp
rh
    , mdsSubDispatcher :: Q Exp
mdsSubDispatcher =
        [|\parentRunner getSub toParent env -> yesodSubDispatch
                                 YesodSubRunnerEnv
                                    { ysreParentRunner = parentRunner
                                    , ysreGetSub = getSub
                                    , ysreToParentRoute = toParent
                                    , ysreParentEnv = env
                                    }
                              |]
    , mdsGetPathInfo :: Q Exp
mdsGetPathInfo = [|W.pathInfo|]
    , mdsSetPathInfo :: Q Exp
mdsSetPathInfo = [|\p r -> r { W.pathInfo = p }|]
    , mdsMethod :: Q Exp
mdsMethod = [|W.requestMethod|]
    , mds404 :: Q Exp
mds404 = [|void notFound|]
    , mds405 :: Q Exp
mds405 = [|void badMethod|]
    , mdsGetHandler :: Maybe String -> String -> Q Exp
mdsGetHandler = Maybe String -> String -> Q Exp
defaultGetHandler
    , mdsUnwrapper :: Exp -> Q Exp
mdsUnwrapper = Exp -> Q Exp
f
    }

-- | If the generation of @'YesodDispatch'@ instance require finer
-- control of the types, contexts etc. using this combinator. You will
-- hardly need this generality. However, in certain situations, like
-- when writing library/plugin for yesod, this combinator becomes
-- handy.
mkDispatchInstance :: Type                      -- ^ The master site type
                   -> Cxt                       -- ^ Context of the instance
                   -> (Exp -> Q Exp)            -- ^ Unwrap handler
                   -> [ResourceTree c]          -- ^ The resource
                   -> DecsQ
mkDispatchInstance :: Type -> [Type] -> (Exp -> Q Exp) -> [ResourceTree c] -> Q [Dec]
mkDispatchInstance Type
master [Type]
cxt Exp -> Q Exp
f [ResourceTree c]
res = do
    Clause
clause' <- MkDispatchSettings Any Any Any -> [ResourceTree c] -> Q Clause
forall b site c a.
MkDispatchSettings b site c -> [ResourceTree a] -> Q Clause
mkDispatchClause ((Exp -> Q Exp) -> Q Exp -> MkDispatchSettings Any Any Any
forall a site b.
(Exp -> Q Exp) -> Q Exp -> MkDispatchSettings a site b
mkMDS Exp -> Q Exp
f [|yesodRunner|]) [ResourceTree c]
res
    let thisDispatch :: Dec
thisDispatch = Name -> [Clause] -> Dec
FunD 'yesodDispatch [Clause
clause']
    [Dec] -> Q [Dec]
forall (m :: * -> *) a. Monad m => a -> m a
return [[Type] -> Type -> [Dec] -> Dec
instanceD [Type]
cxt Type
yDispatch [Dec
thisDispatch]]
  where
    yDispatch :: Type
yDispatch = Name -> Type
ConT ''YesodDispatch Type -> Type -> Type
`AppT` Type
master

mkYesodSubDispatch :: [ResourceTree a] -> Q Exp
mkYesodSubDispatch :: [ResourceTree a] -> Q Exp
mkYesodSubDispatch [ResourceTree a]
res = do
    Clause
clause' <- MkDispatchSettings Any Any Any -> [ResourceTree a] -> Q Clause
forall b site c a.
MkDispatchSettings b site c -> [ResourceTree a] -> Q Clause
mkDispatchClause ((Exp -> Q Exp) -> Q Exp -> MkDispatchSettings Any Any Any
forall a site b.
(Exp -> Q Exp) -> Q Exp -> MkDispatchSettings a site b
mkMDS Exp -> Q Exp
forall (m :: * -> *) a. Monad m => a -> m a
return [|subHelper|]) [ResourceTree a]
res
    Name
inner <- String -> Q Name
newName String
"inner"
    let innerFun :: Dec
innerFun = Name -> [Clause] -> Dec
FunD Name
inner [Clause
clause']
    Name
helper <- String -> Q Name
newName String
"helper"
    let fun :: Dec
fun = Name -> [Clause] -> Dec
FunD Name
helper
                [ [Pat] -> Body -> [Dec] -> Clause
Clause
                    []
                    (Exp -> Body
NormalB (Exp -> Body) -> Exp -> Body
forall a b. (a -> b) -> a -> b
$ Name -> Exp
VarE Name
inner)
                    [Dec
innerFun]
                ]
    Exp -> Q Exp
forall (m :: * -> *) a. Monad m => a -> m a
return (Exp -> Q Exp) -> Exp -> Q Exp
forall a b. (a -> b) -> a -> b
$ [Dec] -> Exp -> Exp
LetE [Dec
fun] (Name -> Exp
VarE Name
helper)

instanceD :: Cxt -> Type -> [Dec] -> Dec
instanceD :: [Type] -> Type -> [Dec] -> Dec
instanceD = Maybe Overlap -> [Type] -> Type -> [Dec] -> Dec
InstanceD Maybe Overlap
forall a. Maybe a
Nothing