{"id":16660946,"url":"https://github.com/agrafix/validate-input","last_synced_at":"2025-04-09T18:51:04.991Z","repository":{"id":28356005,"uuid":"31869789","full_name":"agrafix/validate-input","owner":"agrafix","description":"A small Haskell combinator library that provides a simple way of validating user provided data 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Status](https://travis-ci.org/agrafix/validate-input.svg)](https://travis-ci.org/agrafix/validate-input)\n[![Hackage](https://img.shields.io/hackage/v/validate-input.svg)](http://hackage.haskell.org/package/validate-input)\n\n## Intro\n\nHackage: [validate-input](http://hackage.haskell.org/package/validate-input)\nStackage: [validate-input](https://www.stackage.org/package/validate-input)\n\nInput validation combinator library\n\n\n## Library Usage Example\n\n```haskell\n{-# LANGUAGE OverloadedStrings #-}\n{-# LANGUAGE QuasiQuotes #-}\nimport Data.Validator\nimport qualified Data.Text as T\n\ndata Example\n   = Example\n   { ex_username :: T.Text\n   , ex_dogs :: Int\n   , ex_friendName :: Maybe T.Text\n   } deriving (Show)\n\ndata ExampleChecked\n   = ExampleChecked\n   { exc_username :: T.Text\n   , exc_dogs :: Int\n   , exc_friendName :: T.Text\n   } deriving (Show)\n\nmain :: IO ()\nmain =\n    do putStrLn \"Check results:\"\n       print example\n\ncheckUsername :: Monad m =\u003e ValidationRuleT String m T.Text\ncheckUsername =\n    lengthBetween 3 12 \"Should between 3 and 12 chars\"\n    \u003e=\u003e matchesRegex [re|^[A-za-z0-9]+$|] \"only alpha num\"\n\ncheckNumber :: Monad m =\u003e ValidationRuleT String m Int\ncheckNumber =\n    smallerThan 5 \"No more than 5 dogs allowed\"\n\ncheckExample :: Monad m =\u003e TransValidationRuleT String m Example ExampleChecked\ncheckExample e =\n    ExampleChecked\n    \u003c$\u003e checkUsername (ex_username e)\n    \u003c*\u003e checkNumber (ex_dogs e)\n    \u003c*\u003e requiredValue \"You must provide a friend name!\" (ex_friendName e)\n\nexample :: Either String ExampleChecked\nexample =\n    runValidator checkExample $\n    Example\n    { ex_username = \"alex\"\n    , ex_dogs = 23\n    , ex_friendName = Nothing\n    }\n\n```\n\n## Install\n\n* Using cabal: `cabal install validate-input`\n* Using Stack: `stack install validate-input`\n* From Source (cabal): `git clone https://github.com/agrafix/validate-input.git \u0026\u0026 cd validate-input \u0026\u0026 cabal install`\n* From Source (stack): `git clone https://github.com/agrafix/validate-input.git \u0026\u0026 cd validate-input \u0026\u0026 stack build`\n\n\n## Misc\n\n### Supported GHC Versions\n\n* 8.8.4\n\n### License\n\nReleased under the MIT license.\n(c) 2015-2021 Alexander Thiemann\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fagrafix%2Fvalidate-input","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fagrafix%2Fvalidate-input","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fagrafix%2Fvalidate-input/lists"}