validate-input

Input validation combinator library https://github.com/agrafix/validate-input

Version on this page:0.4.0.0
LTS Haskell 8.5:0.4.0.0
Stackage Nightly 2017-03-24:0.4.0.0
Latest on Hackage:0.4.0.0
MIT licensed and maintained by Alexander Thiemann

Module documentation for 0.4.0.0

validate-input

Build Status Hackage

Intro

Hackage: validate-input Stackage: validate-input

Input validation combinator library

Library Usage Example

{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE QuasiQuotes #-}
import Data.Validator
import qualified Data.Text as T

data Example
   = Example
   { ex_username :: T.Text
   , ex_dogs :: Int
   , ex_friendName :: Maybe T.Text
   } deriving (Show)

data ExampleChecked
   = ExampleChecked
   { exc_username :: T.Text
   , exc_dogs :: Int
   , exc_friendName :: T.Text
   } deriving (Show)

main :: IO ()
main =
    do putStrLn "Check results:"
       print example

checkUsername :: Monad m => ValidationRuleT String m T.Text
checkUsername =
    lengthBetween 3 12 "Should between 3 and 12 chars"
    >=> matchesRegex [re|^[A-za-z0-9]+$|] "only alpha num"

checkNumber :: Monad m => ValidationRuleT String m Int
checkNumber =
    smallerThan 5 "No more than 5 dogs allowed"

checkExample :: Monad m => TransValidationRuleT String m Example ExampleChecked
checkExample e =
    ExampleChecked
    <$> checkUsername (ex_username e)
    <*> checkNumber (ex_dogs e)
    <*> requiredValue "You must provide a friend name!" (ex_friendName e)

example :: Either String ExampleChecked
example =
    runValidator checkExample $
    Example
    { ex_username = "alex"
    , ex_dogs = 23
    , ex_friendName = Nothing
    }

Install

  • Using cabal: cabal install validate-input
  • Using Stack: stack install validate-input
  • From Source (cabal): git clone https://github.com/agrafix/validate-input.git && cd validate-input && cabal install
  • From Source (stack): git clone https://github.com/agrafix/validate-input.git && cd validate-input && stack build

Misc

Supported GHC Versions

  • 7.8.4
  • 7.10.2

License

Released under the MIT license. (c) 2015 Alexander Thiemann

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