functor-monadic (empty) → 0.1.0.0
raw patch · 4 files changed
+312/−0 lines, 4 filesdep +basesetup-changed
Dependencies added: base
Files
- Data/Functor/Monadic.hs +85/−0
- LICENSE.md +202/−0
- Setup.hs +2/−0
- functor-monadic.cabal +23/−0
+ Data/Functor/Monadic.hs view
@@ -0,0 +1,85 @@+-- |Helper functions for functors. +-- +-- These operators are designed to make the interoperation between monadic +-- and pure computations more convenient by allowed them to be chained together +-- without peppering the program with superflouos return statements. +-- +-- Each function is a pure analogue of a monadic one. The correspondences are +-- as follows: +-- @ +-- >$> ~ >>= +-- $> ~ >> +-- <$ ~ << (re-exported from Data.Functor) +-- <$< ~ =<< (same as Data.Functor.<$>, but with the precedence of >>=) +-- >=$> ~ >=> +-- <$=< ~ <=< +-- @ +-- +-- Lastly, '|>' is left-to-right function composition (flipped version of '$'). +module Data.Functor.Monadic ( + module Data.Functor, + (>$>), + ($>), + (<$<), + (>=$>), + (<$=<), + (|>)) where + +import Data.Functor ((<$)) + +infixl 1 >$> +infixl 1 $> +infixr 1 <$< +infixl 1 >=$> +infixr 1 <$=< +infixl 1 |> + +-- |Flipped 'fmap' for chaining plain functions after a functor in the following +-- way: +-- +-- @ +-- readFile '1.txt' >$> lines >$> map length >>= print +-- @ +-- +-- @lines@ and @map length@ are non-monadic functions, but peppering +-- them with returns, as pure '>>=' necessitates, is quite tedious. +-- +-- In general: +-- +-- @ +-- m >>= return . f is the same as m >$> f +-- @ +(>$>) :: Functor f => f a -> (a -> b) -> f b +(>$>) = flip fmap + +-- |Left-associatiative, flipped '$>'. Corresponds to '>>' +($>) :: Functor f => f b -> a -> f a +($>) = flip (<$) + +-- |Right-associative infix synonym for 'fmap'. +(<$<) :: Functor f => (a -> b) -> f a -> f b +(<$<) = fmap + +-- |Application of '>$>' to Kleisli composition 'Control.Monad.>=>' +-- Use is analogous to that of '>$>', e.g. +-- +-- @ +-- f :: FilePath -> IO () +-- f = (readFile >=$> lines >=$> map length >=> print) +-- @ +-- +-- In general: +-- +-- @ +-- m >=$> f is the same as m >=> return . f +-- @ +(>=$>) :: Functor f => (a -> f b) -> (b -> c) -> a -> f c +(>=$>) f g x = f x >$> g + +-- |Flipped version of '>=$>'. +(<$=<) :: Functor f => (b -> c) -> (a -> f b) -> a -> f c +(<$=<) = flip (>=$>) + +-- |Flipped version of '$'. +(|>) :: a -> (a -> b) -> b +(|>) = flip ($)
+ LICENSE.md view
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+ Setup.hs view
@@ -0,0 +1,2 @@+import Distribution.Simple +main = defaultMain
+ functor-monadic.cabal view
@@ -0,0 +1,23 @@+-- Initial functor-monadic.cabal generated by cabal init. For further +-- documentation, see http://haskell.org/cabal/users-guide/ + +name: functor-monadic +version: 0.1.0.0 +synopsis: Monad-style combinators for functors. +description: Monad's bind (>>=, >=>) allows the infix chaining of monadic + functions, but no analogues exist for functors. This package + provides a handful of handy operators that ease the piping + together a functor- and monad-level functions. +homepage: https://github.com/ombocomp/FunctorMonadic/ +license: Apache-2.0 +license-file: LICENSE.md +author: Janos Tapolczai +maintainer: janos.tapolczai@gmail.com +category: Data +build-type: Simple +cabal-version: >=1.10 + +library + exposed-modules: Data.Functor.Monadic + build-depends: base >=4.7 && <4.8 + default-language: Haskell2010