data-function-meld (empty) → 0.1.0.0

raw patch · 4 files changed

+105/−0 lines, 4 filesdep +basesetup-changed

Dependencies added: base

Files

LICENSE +30/−0
Setup.hs +2/−0
data-function-meld.cabal +23/−0
src/Data/Function/Meld.hs +50/−0

+ LICENSE view

@@ -0,0 +1,30 @@+Copyright (c) 2016, Eric Brisco
+
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+    * Redistributions of source code must retain the above copyright
+      notice, this list of conditions and the following disclaimer.
+
+    * Redistributions in binary form must reproduce the above
+      copyright notice, this list of conditions and the following
+      disclaimer in the documentation and/or other materials provided
+      with the distribution.
+
+    * Neither the name of Eric Brisco nor the names of other
+      contributors may be used to endorse or promote products derived
+      from this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

+ Setup.hs view

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

+ data-function-meld.cabal view

@@ -0,0 +1,23 @@+name:                data-function-meld
+version:             0.1.0.0
+synopsis:            Map the arguments and return value of functions.
+description:         Map the arguments and return value of functions.   
+homepage:            https://github.com/erisco/data-function-meld
+license:             BSD3
+license-file:        LICENSE
+author:              Eric Brisco
+maintainer:          eric.brisco@gmail.com
+copyright:           Copyright (c) 2015, Eric Brisco
+category:            Data
+build-type:          Simple
+cabal-version:       >=1.10
+
+library
+
+  exposed-modules:     Data.Function.Meld
+  
+  build-depends:       base >=4.7 && <4.8
+  
+  hs-source-dirs:      src
+  
+  default-language:    Haskell2010

+ src/Data/Function/Meld.hs view

@@ -0,0 +1,50 @@+{-| Map the arguments and return value of functions. ++General use:++  - @f $* g1 $$ g2  $$ gn *$ h = \x1  xn -> h (f (g1 x1) (g2 x2)  (gn xn))@++Examples:++  - @on f g = f $* g $$ g *$ id@+  - @comparing f = compare $* f $$ f *$ id@+  - @f . g = f $* g *$ id@++Work based on <http://conal.net/blog/posts/semantic-editor-combinators Semantic Editor Combinators> (Conal Elliot, 2016/05/19).+-}+module Data.Function.Meld+( ($*)+, ($$)+, (*$)+) where++import Prelude (flip, (.), ($))++-- | Map a function argument.+arg :: (a' -> a) -> (a -> b) -> a' -> b+arg = flip (.)++-- | Map a function return value.+ret :: (b -> c) -> (a -> b) -> a -> c+ret = (.)++-- | Begin melding.+--+-- @f $* g1 $$ g2  $$ gn *$ h = \x1  xn -> h (f (g1 x1) (g2 x2)  (gn xn))@+($*) :: (b -> c) -> (a -> b) -> (c -> d) -> a -> d+($*) x f g = ret g (arg f x)+infixl 8 $*++-- | Continue melding.+--+-- @f $* g1 $$ g2  $$ gn *$ h = \x1  xn -> h (f (g1 x1) (g2 x2)  (gn xn))@+($$) :: (((b -> c) -> a -> d) -> e) -> (a -> b) -> (c -> d) -> e+($$) f g h = f (ret h . arg g)+infixl 7 $$++-- | Finish melding.+--+-- @f $* g1 $$ g2  $$ gn *$ h = \x1  xn -> h (f (g1 x1) (g2 x2)  (gn xn))@+(*$) :: (a -> b) -> a -> b+(*$) = ($)+infixl 6 *$