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For the pros +the following two lines are not defined if you use 'makeObjectFlexible'. + +>type instance Output Simple (Method m) = MethodOutput Simple (Method m) +>type instance Output Simple (Method m := input) = MethodOutput Simple (Method m := input) + +First we need a method name for '_simple' + +>type Simple_ = Method (T_s,T_i,T_m,T_p,T_l,T_e) +>simple = Method (T_s,T_i,T_m,T_p,T_l,T_e) :: Simple_ + +it is done this way so different modules can define the same name +you can use the macro makeName to produce the same thing. + +So now we can implement a method we only need to make an instance of 'Action' and 'Output' or +since 'Output' was defered of 'MethodOutput' + +the output will be an Int since _simple has type Int. + +>type instance MethodOutput Simple Simple_ = Int + +and the implementation will simply be a call to '_simple' + +>instance Action Simple Simple_ where +> object . _ = _simple object + +we can ignore the argument since we know it from the type + +Now we can also make the methodset + +>type instance MethodOutput Simple (Simple_ := anything) = Simple +>instance (anything ~ Int) => Action Simple (Simple_ := anything) where +> object . (_ := int) = object { _simple = int } + +Notice how we match anything and only in the context make sure that it is in deed Int. +This is because other wise GHC would give some ambiguity error since someone else could +possibly add an instance + +instance Action Simple (Simple_ := Float) + +So let's see what we can do so far. + +>fooAndSimple = do +> print$ Foo 1 'a' 1 . blub := 2 . blub -- 2 +> print$ Simple 1 . simple -- 1 + +Pretty cool. Ok now something a bit more complicated for 'Data.Map'. + +>type instance Output (Map k v) action = OutputMap (Map k v) action + +>type family OutputMap map action where +> OutputMap (Map k v) (Method m) = MethodOutput (Map k v) (Method m) +> OutputMap (Map k v) [k' := v'] = (Map k v) +> OutputMap (Map k v) (k' := v') = (Map k v) +> OutputMap (Map k v) (Maybe k') = Maybe v +> OutputMap (Map k v) [k'] = [v] +> OutputMap (Map k v) k' = v + +>makeName "size" +>type instance MethodOutput (Map k v) Size_ = Int +>instance Action (Map k v) Size_ where +> obj . _ = Map.size obj + +>instance (k~k', v~v', OutputMap (Map k v) [k' := v'] ~ (Map k v), Ord k) => Action (Map k v) [k' := v'] where +> map . (k := v:rest) = Map.insert k v map . rest +> map . [] = map + +>instance (k~k', v~v', OutputMap (Map k v) (k' := v') ~ (Map k v), Ord k) => Action (Map k v) (k' := v') where +> map . assign = map . [assign] + +>instance (k~k', OutputMap (Map k v) (Maybe k') ~ (Maybe v), Ord k) => Action (Map k v) (Maybe k') where +> map . (Just key) = Map.lookup key map +> map . Nothing = Nothing + +>instance (k~k', OutputMap (Map k v) [k'] ~ [v], Ord k) => Action (Map k v) [k'] where +> map . keys = catMaybes $ flip Map.lookup map <* keys + +>instance (k~k', OutputMap (Map k v) k' ~ v, Ord k) => Action (Map k v) k' where +> map . key = fromMaybe (error "no element of this key in map") $ map . Just key + +>mapExample = do +> let aMap = Map.empty . ['a' := "first_a", 'b' := "first_b"] +> print$ aMap . ('a' := "secont_a") . 'a' -- "second_a +> print$ aMap . ['a','b','c'] -- ["first_a","first_b"] +> print$ aMap . size -- 2 +> print$ Map.empty . [(1::Int) := "hallo" ] . (1::Int) -- "hallo" diff --git a/Object/Letters.hs b/Object/Letters.hs new file mode 100644 --- /dev/null +++ b/Object/Letters.hs @@ -0,0 +1,68 @@ +module Object.Letters where + +newtype Method a = Method a deriving (Show,Read,Eq) + +data T_a = T_a deriving (Show, Read, Eq) +data T_b = T_b deriving (Show, Read, Eq) +data T_c = T_c deriving (Show, Read, Eq) +data T_d = T_d deriving (Show, Read, Eq) +data T_e = T_e deriving (Show, Read, Eq) +data T_f = T_f deriving (Show, Read, Eq) +data T_g = T_g deriving (Show, Read, Eq) +data T_h = T_h deriving (Show, Read, Eq) +data T_i = T_i deriving (Show, Read, Eq) +data T_j = T_j deriving (Show, Read, Eq) +data T_k = T_k deriving (Show, Read, Eq) +data T_l = T_l deriving (Show, Read, Eq) +data T_m = T_m deriving (Show, Read, Eq) +data T_n = T_n deriving (Show, Read, Eq) +data T_o = T_o deriving (Show, Read, Eq) +data T_p = T_p deriving (Show, Read, Eq) +data T_q = T_q deriving (Show, Read, Eq) +data T_r = T_r deriving (Show, Read, Eq) +data T_s = T_s deriving (Show, Read, Eq) +data T_t = T_t deriving (Show, Read, Eq) +data T_u = T_u deriving (Show, Read, Eq) +data T_v = T_v deriving (Show, Read, Eq) +data T_w = T_w deriving (Show, Read, Eq) +data T_x = T_x deriving (Show, Read, Eq) +data T_y = T_y deriving (Show, Read, Eq) +data T_z = T_z deriving (Show, Read, Eq) +data T_A = T_A deriving (Show, Read, Eq) +data T_B = T_B deriving (Show, Read, Eq) +data T_C = T_C deriving (Show, Read, Eq) +data T_D = T_D deriving (Show, Read, Eq) +data T_E = T_E deriving (Show, Read, Eq) +data T_F = T_F deriving (Show, Read, Eq) +data T_G = T_G deriving (Show, Read, Eq) +data T_H = T_H deriving (Show, Read, Eq) +data T_I = T_I deriving (Show, Read, Eq) +data T_J = T_J deriving (Show, Read, Eq) +data T_K = T_K deriving (Show, Read, Eq) +data T_L = T_L deriving (Show, Read, Eq) +data T_M = T_M deriving (Show, Read, Eq) +data T_N = T_N deriving (Show, Read, Eq) +data T_O = T_O deriving (Show, Read, Eq) +data T_P = T_P deriving (Show, Read, Eq) +data T_Q = T_Q deriving (Show, Read, Eq) +data T_R = T_R deriving (Show, Read, Eq) +data T_S = T_S deriving (Show, Read, Eq) +data T_T = T_T deriving (Show, Read, Eq) +data T_U = T_U deriving (Show, Read, Eq) +data T_V = T_V deriving (Show, Read, Eq) +data T_W = T_W deriving (Show, Read, Eq) +data T_X = T_X deriving (Show, Read, Eq) +data T_Y = T_Y deriving (Show, Read, Eq) +data T_Z = T_Z deriving (Show, Read, Eq) +data T_0 = T_0 deriving (Show, Read, Eq) +data T_1 = T_1 deriving (Show, Read, Eq) +data T_2 = T_2 deriving (Show, Read, Eq) +data T_3 = T_3 deriving (Show, Read, Eq) +data T_4 = T_4 deriving (Show, Read, Eq) +data T_5 = T_5 deriving (Show, Read, Eq) +data T_6 = T_6 deriving (Show, Read, Eq) +data T_7 = T_7 deriving (Show, Read, Eq) +data T_8 = T_8 deriving (Show, Read, Eq) +data T_9 = T_9 deriving (Show, Read, Eq) +data T__ = T__ deriving (Show, Read, Eq) +data T_' = T_' deriving (Show, Read, Eq) diff --git a/Object/Templates.hs b/Object/Templates.hs new file mode 100644 --- /dev/null +++ b/Object/Templates.hs @@ -0,0 +1,111 @@ +{-# LANGUAGE TemplateHaskell, MultiParamTypeClasses, TypeFamilies, FlexibleInstances, OverlappingInstances, TypeOperators, PatternGuards #-} +module Object.Templates( + makeName, + makeObject, + makeObjectFlexible + ) where + +import Object.Letters +import Object.Types + +import Prelude hiding ((.)) +import Language.Haskell.TH +import Language.Haskell.TH.Syntax +import Data.Char +import Data.Maybe + +-- | +-- takes lower case 'foo' and makes +-- 'type Foo = Method (T_f,T_o,T_o)' +-- 'foo = Method (T_f,T_o,T_o) :: Foo' +makeName :: String -> Q [Dec] +makeName name = makeName' name *> fst + +makeName' :: String -> Q ([Dec],(Name,Name)) +makeName' name = go where + go + | [] <- name = fail "can't make empty variable" + | not $ isLower $ head name = fail $ name ++ ": does not start with a lower letter" + | (first:rest) <- name = do + typeTuple <- mapM typeCon name + dataTuple <- mapM dataCon name + typeName <- newName $ [toUpper first] ++ rest ++ ['_'] + dataName <- newName $ [first] ++ rest + typ <- [t| Method $(return $ foldl AppT (TupleT (length typeTuple)) typeTuple) |] + dat <- [| Method $(return $ (TupE dataTuple)) :: $(return $ ConT typeName) |] + let typeDecl = TySynD typeName [] typ + let dataDecl = ValD (VarP dataName) (NormalB dat) [] + return ([typeDecl,dataDecl],(typeName,dataName)) + typeCon c = do + Just res <- lookupTypeName $ "T_" ++ [c] + return $ ConT res + dataCon c = do + Just res <- lookupValueName $ "T_" ++ [c] + return $ ConE res + +-- | +-- returns (typeName, variableNames, and fields) +getInfo :: Info -> Q (Name, [Name], [VarStrictType]) +getInfo (TyConI (DataD context typeName vars [RecC constrName fields] _)) = go where + go = return (typeName, map getVar vars, fields) + getVar (PlainTV n) = n + getVar (KindedTV n _) = n +getInfo _ = fail $ "type needs to have a single constructor record type" + +getFieldName (fieldName,strictness,type') + | nameBase fieldName !! 0 /= '_' || not (isLower $ nameBase fieldName !! 1) + = fail $ show fieldName ++ + ": all fieldNames must commence with a '_' \ + \and continue with a lower case letter" + | otherwise = nameBase fieldName + +-- | +-- takes a Type with one record constructor +-- 'setGetFunctional \'\'Foo' +-- and produces +-- set and get instances for all fields +makeObject :: Name -> Q [Dec] +makeObject = makeObject' False + +makeObjectFlexible = makeObject' True + +-- | +-- implements 'makeObject' or 'makeObjectFlexible' depending on the first argument +makeObject' :: Bool -> Name -> Q [Dec] +makeObject' flexible name = go name where + go :: Name -> Q [Dec] + go obj = do + (name, vars, fields) <- reify name >>= getInfo + let objType = foldl AppT (ConT name) (VarT<*vars) + outputDecls <- if flexible + then return [] + else [d| + type instance Output $(return objType) (Method m) = + MethodOutput $(return objType) (Method m) + type instance Output $(return objType) (Method m := input) = + MethodOutput $(return objType) (Method m := input) + |] + fieldDecls <- (sequence $ makeField name vars <* fields) *> concat + return $ outputDecls ++ fieldDecls +-- "(Object.Example.Foo,[x_1627454179],[(Object.Example._bar,NotStrict,ConT GHC.Types.Int),(Object.Example._baz,NotStrict,ConT GHC.Types.Char),(Object.Example._blub,NotStrict,VarT x_1627454179)])" + makeField :: Name -> [Name] -> VarStrictType -> Q [Dec] + makeField _ _ (name,_,_) | '_' /= head (nameBase name) = fail $ show name ++ " did not start with underscore" + makeField name vars (fName, _, fType) = do + (decs1,(typeName,dataName)) <- makeName' (tail $ nameBase fName) + methodOutput <- lookupTypeName "Object.Types.MethodOutput" *> fromMaybe (error "no MethodOutput in scope") + let objType = foldl AppT (ConT name) (VarT<*vars) + + let methodOutInst = TySynInstD methodOutput $ TySynEqn [objType, ConT typeName] fType + actionInst <- [d| + instance Action $(return objType) $(return $ ConT typeName) where + object . _ = $(return $ VarE fName) object + |] + + matchType <- [t| $(return $ ConT typeName) := $(return $ VarT $ mkName "value") |] + let methodSetOutInst = TySynInstD methodOutput $ TySynEqn [objType, matchType] objType + actionSetInst <- [d| + instance (value ~ $(return fType)) => Action $(return objType) $(return matchType) where + object . ( _ := v) = $(recUpdE [e|object|] [return (fName, VarE $ mkName "v")]) + |] + + return $ [methodOutInst,methodSetOutInst] ++ actionInst ++ actionSetInst ++ decs1 diff --git a/Object/Types.hs b/Object/Types.hs new file mode 100644 --- /dev/null +++ b/Object/Types.hs @@ -0,0 +1,55 @@ +{-# LANGUAGE MultiParamTypeClasses, TypeFamilies, TypeOperators #-} +module Object.Types where + +import Prelude hiding ((.)) +import Control.Applicative +import Control.Monad + +type family Output object action + +class Action object action where + (.) :: object -> action -> Output object action + +data a := b = a := b deriving (Show,Read,Eq) + +type family MethodOutput object method + +(%) = flip ($) +a ... b = \x -> a (b x) + +-- | +-- Explanation of all these operators. +-- They are basically an assortment of 'Functor' and +-- 'Applicative' functions. I.e., +-- '[1,2,3] *> (+1)' === map (+1) [1,2,3]' +-- The asterisk '*' indicates where the 'Functor', 'Applicative' is. +-- And the greather than (smaller than) indicates in which direction +-- the argument is going. So you could also have +-- '[(+1),(+2),(+3)] *< 1 === map ($ 1) [(+1),(+2),(+3)]'. +-- If there are asterisks on both sides the 'Functor' has to be 'Applicative' +a *> b = fmap (%b) a +a *< b = fmap ($ b) a -- space is in case of TH +a *. b = fmap (.b) a +a >* b = fmap (a%) b +a <* b = fmap (a$) b +a .* b = fmap (a.) b +a *>* b = (%) <$> (a) <*> b +a *<* b = ($) <$> a <*> b +a *.* b = (.) <$> a <*> b + + +infixl 8 . +infixl 9 := +infixl 0 % + +infixl 4 *. +infixl 4 .* +infixl 4 *.* + +infixl 4 *> +infixl 4 >* +infixl 4 *>* + +infixr 4 *< +infixr 4 <* +infixr 4 *<* diff --git a/Setup.hs b/Setup.hs new file mode 100644 --- /dev/null +++ b/Setup.hs @@ -0,0 +1,2 @@ +import Distribution.Simple +main = defaultMain