Object (empty) → 1.0

raw patch · 8 files changed

+599/−0 lines, 8 filesdep +basedep +containersdep +ghcsetup-changed

Dependencies added: base, containers, ghc, template-haskell

Files

LICENSE +201/−0
Object.cabal +22/−0
Object.hs +13/−0
Object/Example.lhs +127/−0
Object/Letters.hs +68/−0
Object/Templates.hs +111/−0
Object/Types.hs +55/−0
Setup.hs +2/−0

+ LICENSE view

@@ -0,0 +1,201 @@+Apache License+                           Version 2.0, January 2004+                        http://www.apache.org/licenses/++   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION++   1. Definitions.++      "License" shall mean the terms and conditions for use, reproduction,+      and distribution as defined by Sections 1 through 9 of this document.++      "Licensor" shall mean the copyright owner or entity authorized by+      the copyright owner that is granting the License.++      "Legal Entity" shall mean the union of the acting entity and all+      other entities that control, are controlled by, or are under common+      control with that entity. For the purposes of this definition,+      "control" means (i) the power, direct or indirect, to cause the+      direction or management of such entity, whether by contract or+      otherwise, or (ii) ownership of fifty percent (50%) or more of the+      outstanding shares, or (iii) beneficial ownership of such entity.++      "You" (or "Your") shall mean an individual or Legal Entity+      exercising permissions granted by this License.++      "Source" form shall mean the preferred form for making modifications,+      including but not limited to software source code, documentation+      source, and configuration files.++      "Object" form shall mean any form resulting from mechanical+      transformation or translation of a Source form, including but+      not limited to compiled object code, generated documentation,+      and conversions to other media types.++      "Work" shall mean the work of authorship, whether in Source or+      Object form, made available under the License, as indicated by a+      copyright notice that is included in or attached to the work+      (an example is provided in the Appendix below).++      "Derivative Works" shall mean any work, whether in Source or Object+      form, that is based on (or derived from) the Work and for which the+      editorial revisions, annotations, elaborations, or other modifications+      represent, as a whole, an original work of authorship. For the purposes+      of this License, Derivative Works shall not include works that remain+      separable from, or merely link (or bind by name) to the interfaces of,+      the Work and Derivative Works thereof.++      "Contribution" shall mean any work of authorship, including+      the original version of the Work and any modifications or additions+      to that Work or Derivative Works thereof, that is intentionally+      submitted to Licensor for inclusion in the Work by the copyright owner+      or by an individual or Legal Entity authorized to submit on behalf of+      the copyright owner. For the purposes of this definition, "submitted"+      means any form of electronic, verbal, or written communication sent+      to the Licensor or its representatives, including but not limited to+      communication on electronic mailing lists, source code control systems,+      and issue tracking systems that are managed by, or on behalf of, the+      Licensor for the purpose of discussing and improving the Work, but+      excluding communication that is conspicuously marked or otherwise+      designated in writing by the copyright owner as "Not a Contribution."++      "Contributor" shall mean Licensor and any individual or Legal Entity+      on behalf of whom a Contribution has been received by Licensor and+      subsequently incorporated within the Work.++   2. Grant of Copyright License. Subject to the terms and conditions of+      this License, each Contributor hereby grants to You a perpetual,+      worldwide, non-exclusive, no-charge, royalty-free, irrevocable+      copyright license to reproduce, prepare Derivative Works of,+      publicly display, publicly perform, sublicense, and distribute the+      Work and such Derivative Works in Source or Object form.++   3. Grant of Patent License. Subject to the terms and conditions of+      this License, each Contributor hereby grants to You a perpetual,+      worldwide, non-exclusive, no-charge, royalty-free, irrevocable+      (except as stated in this section) patent license to make, have made,+      use, offer to sell, sell, import, and otherwise transfer the Work,+      where such license applies only to those patent claims licensable+      by such Contributor that are necessarily infringed by their+      Contribution(s) alone or by combination of their Contribution(s)+      with the Work to which such Contribution(s) was submitted. If You+      institute patent litigation against any entity (including a+      cross-claim or counterclaim in a lawsuit) alleging that the Work+      or a Contribution incorporated within the Work constitutes direct+      or contributory patent infringement, then any patent licenses+      granted to You under this License for that Work shall terminate+      as of the date such litigation is filed.++   4. Redistribution. You may reproduce and distribute copies of the+      Work or Derivative Works thereof in any medium, with or without+      modifications, and in Source or Object form, provided that You+      meet the following conditions:++      (a) You must give any other recipients of the Work or+          Derivative Works a copy of this License; and++      (b) You must cause any modified files to carry prominent notices+          stating that You changed the files; and++      (c) You must retain, in the Source form of any Derivative Works+          that You distribute, all copyright, patent, trademark, and+          attribution notices from the Source form of the Work,+          excluding those notices that do not pertain to any part of+          the Derivative Works; and++      (d) If the Work includes a "NOTICE" text file as part of its+          distribution, then any Derivative Works that You distribute must+          include a readable copy of the attribution notices contained+          within such NOTICE file, excluding those notices that do not+          pertain to any part of the Derivative Works, in at least one+          of the following places: within a NOTICE text file distributed+          as part of the Derivative Works; within the Source form or+          documentation, if provided along with the Derivative Works; or,+          within a display generated by the Derivative Works, if and+          wherever such third-party notices normally appear. The contents+          of the NOTICE file are for informational purposes only and+          do not modify the License. You may add Your own attribution+          notices within Derivative Works that You distribute, alongside+          or as an addendum to the NOTICE text from the Work, provided+          that such additional attribution notices cannot be construed+          as modifying the License.++      You may add Your own copyright statement to Your modifications and+      may provide additional or different license terms and conditions+      for use, reproduction, or distribution of Your modifications, or+      for any such Derivative Works as a whole, provided Your use,+      reproduction, and distribution of the Work otherwise complies with+      the conditions stated in this License.++   5. Submission of Contributions. Unless You explicitly state otherwise,+      any Contribution intentionally submitted for inclusion in the Work+      by You to the Licensor shall be under the terms and conditions of+      this License, without any additional terms or conditions.+      Notwithstanding the above, nothing herein shall supersede or modify+      the terms of any separate license agreement you may have executed+      with Licensor regarding such Contributions.++   6. Trademarks. This License does not grant permission to use the trade+      names, trademarks, service marks, or product names of the Licensor,+      except as required for reasonable and customary use in describing the+      origin of the Work and reproducing the content of the NOTICE file.++   7. Disclaimer of Warranty. Unless required by applicable law or+      agreed to in writing, Licensor provides the Work (and each+      Contributor provides its Contributions) on an "AS IS" BASIS,+      WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or+      implied, including, without limitation, any warranties or conditions+      of TITLE, NON-INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A+      PARTICULAR PURPOSE. You are solely responsible for determining the+      appropriateness of using or redistributing the Work and assume any+      risks associated with Your exercise of permissions under this License.++   8. Limitation of Liability. In no event and under no legal theory,+      whether in tort (including negligence), contract, or otherwise,+      unless required by applicable law (such as deliberate and grossly+      negligent acts) or agreed to in writing, shall any Contributor be+      liable to You for damages, including any direct, indirect, special,+      incidental, or consequential damages of any character arising as a+      result of this License or out of the use or inability to use the+      Work (including but not limited to damages for loss of goodwill,+      work stoppage, computer failure or malfunction, or any and all+      other commercial damages or losses), even if such Contributor+      has been advised of the possibility of such damages.++   9. Accepting Warranty or Additional Liability. While redistributing+      the Work or Derivative Works thereof, You may choose to offer,+      and charge a fee for, acceptance of support, warranty, indemnity,+      or other liability obligations and/or rights consistent with this+      License. However, in accepting such obligations, You may act only+      on Your own behalf and on Your sole responsibility, not on behalf+      of any other Contributor, and only if You agree to indemnify,+      defend, and hold each Contributor harmless for any liability+      incurred by, or claims asserted against, such Contributor by reason+      of your accepting any such warranty or additional liability.++   END OF TERMS AND CONDITIONS++   APPENDIX: How to apply the Apache License to your work.++      To apply the Apache License to your work, attach the following+      boilerplate notice, with the fields enclosed by brackets "{}"+      replaced with your own identifying information. (Don't include+      the brackets!)  The text should be enclosed in the appropriate+      comment syntax for the file format. We also recommend that a+      file or class name and description of purpose be included on the+      same "printed page" as the copyright notice for easier+      identification within third-party archives.++   Copyright {yyyy} {name of copyright owner}++   Licensed under the Apache License, Version 2.0 (the "License");+   you may not use this file except in compliance with the License.+   You may obtain a copy of the License at++       http://www.apache.org/licenses/LICENSE-2.0++   Unless required by applicable law or agreed to in writing, software+   distributed under the License is distributed on an "AS IS" BASIS,+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.+   See the License for the specific language governing permissions and+   limitations under the License.

+ Object.cabal view

@@ -0,0 +1,22 @@+Name:	Object+Version:	1.0+Cabal-Version:	>= 1.4+License:	Apache-2.0+License-File:	LICENSE+Author:		Silvio Frischknecht+Homepage:	https://github.com/yokto/object+Category:	Data, Control+Maintainer: yokto.reports@gmail.com+Synopsis:	Object oriented programming for haskell using multiparameter typeclasses.+Description:	Read the homepage or Object.Example for more information.+Build-Type:	Simple++Library+  Build-Depends:	base >= 3 && < 5, ghc >= 7.8, template-haskell, containers+  Exposed-modules:+    Object,+    Object.Types,+    Object.Templates,+    Object.Example,+    Object.Letters+  Extensions:

+ Object.hs view

@@ -0,0 +1,13 @@+{-# LANGUAGE TypeFamilies, MultiParamTypeClasses #-}+-- | This module Just reexports Object.Types and Object.Templates+module Object(+    module Object.Types,+    module Object.Templates+    ) where++import Object.Types+import Object.Templates++type instance Output (b -> c) (a -> b') = (a -> c)+instance (b ~ b') => Action (b -> c) (a -> b') where+	f . g = f Prelude.. g

+ Object/Example.lhs view

@@ -0,0 +1,127 @@+>{-# LANGUAGE TemplateHaskell, FlexibleInstances, TypeOperators, DataKinds, DeriveGeneric, MultiParamTypeClasses, FlexibleContexts, TypeFamilies, DataKinds, UndecidableInstances, OverlappingInstances #-}+>module Object.Example where++>import Object.Templates+>import Object.Types+>import Object.Letters++>import Prelude hiding ((.))+>import Data.Maybe+>import qualified Data.Map as Map+>import Data.Map (Map)++In this example file we will see how to make objects+out of two data type 'Simple' and 'Foo x'++>data Simple = Simple { _simple :: Int } deriving (Show)++>data Foo x = Foo {+>	_bar ::Int,+>	_baz :: Char,+>	_blub :: x+>	} deriving (Show)++To make 'Foo x' we use templateHaskell.++>makeObject ''Foo++Poof, and we're done.+For 'Simple' we will do everything manually so you can see what happenes behind 'makeObject'.+We will want to make instances of the following two things that are defined in Object.Types.++type family Output object action++class Action object action where+	(.) :: object -> action -> Output object action++Now 'makeObject' makes two types of 'Actions' actions called methods+(where action has type 'Method m' for some m) and actions called methodsets+(where action has type 'Method m := input).++Unless you want to use a closed type class later the following definition would not be neccessary.+So if you are new you can imagine 'Output' and 'MethodOutput' are the same thing. 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"

+ Object/Letters.hs view

@@ -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)

+ Object/Templates.hs view

@@ -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

+ Object/Types.hs view

@@ -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 *<*

+ Setup.hs view

@@ -0,0 +1,2 @@+import Distribution.Simple+main = defaultMain