validation-1.1.5: validation.cabal
name: validation
version: 1.1.5
license: BSD3
license-file: LICENCE
author: Tony Morris <ʇǝu˙sıɹɹoɯʇ@ןןǝʞsɐɥ> <dibblego>, Nick Partridge <nkpart>
maintainer: Tony Morris <ʇǝu˙sıɹɹoɯʇ@ןןǝʞsɐɥ> <dibblego>, Nick Partridge <nkpart>
copyright: Copyright (C) 2010-2013 Tony Morris, Nick Partridge
Copyright (C) 2014,2015 NICTA Limited
Copyright (c) 2016-2019 Commonwealth Scientific and Industrial Research Organisation (CSIRO) ABN 41 687 119 230
Copyright (c) 2019-2026 Tony Morris
synopsis: A data-type like Either but with an accumulating Applicative
category: Data
description:
<<https://logo.systemf.com.au/systemf-450x450.png>>
.
A data-type like Either but with differing properties and type-class
instances.
.
Library support is provided for this different representation, include
`lens`-related functions for converting between each and abstracting over their
similarities.
.
* `Validation`
.
The `Validation` data type is isomorphic to `Either`, but has an instance
of `Applicative` that accumulates on the error side. That is to say, if two
(or more) errors are encountered, they are appended using a `Semigroup`
operation.
.
As a consequence of this `Applicative` instance, there is no corresponding
`Bind` or `Monad` instance. `Validation` is an example of, "An applicative
functor that is not a monad."
homepage: https://github.com/system-f/validation
bug-reports: https://github.com/system-f/validation/issues
cabal-version: >= 1.10
build-type: Simple
extra-source-files: changelog
tested-with: GHC==9.0.1, GHC==8.10.4, GHC==8.8.4, GHC==8.6.5, GHC==8.4.4
source-repository head
type: git
location: git@github.com:system-f/validation.git
library
default-language:
Haskell2010
build-depends:
base >= 4.11 && < 5
, assoc >= 1 && < 2
, deepseq >= 1.4.3 && < 2
, selective >= 0.6 && < 1
, semigroups >= 0.18.2 && < 1
, semigroupoids >= 5.2.2 && < 7
, bifunctors >= 5.5 && < 6
, lens >= 4.0.5 && < 6
ghc-options:
-Wall
hs-source-dirs:
src
exposed-modules:
Data.Validation
test-suite hedgehog
type:
exitcode-stdio-1.0
main-is:
hedgehog_tests.hs
default-language:
Haskell2010
build-depends:
base >= 4.11 && < 5
, hedgehog >= 0.5 && < 2
, semigroups >= 0.18.2 && < 1
, validation
ghc-options:
-Wall
-threaded
hs-source-dirs:
test
test-suite hunit
type:
exitcode-stdio-1.0
main-is:
hunit_tests.hs
default-language:
Haskell2010
build-depends:
base >= 4.11 && < 5
, HUnit >= 1.6 && < 1.7
, lens >= 4.0.5 && < 6
, semigroups >= 0.18.2 && < 1
, validation
ghc-options:
-Wall
-threaded
hs-source-dirs:
test