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|
{-|
Module : VeriFuzz.Config
Description : Configuration file format and parser.
Copyright : (c) 2019, Yann Herklotz Grave
License : GPL-3
Maintainer : ymherklotz [at] gmail [dot] com
Stability : experimental
Portability : POSIX
Configuration file format and parser.
-}
{-# LANGUAGE TemplateHaskell #-}
module VeriFuzz.Config
( Config(..)
, Probability(..)
, probAssign
, probAlways
, configProbability
, parseConfigFile
)
where
import Control.Applicative (Alternative)
import Control.Lens hiding ((.=))
import Data.Maybe (fromMaybe)
import Toml (TomlCodec, (.=))
import qualified Toml
data Probability = Probability { _probAssign :: {-# UNPACK #-} !Int
, _probAlways :: {-# UNPACK #-} !Int
}
deriving (Eq, Show)
makeLenses ''Probability
newtype Config = Config { _configProbability :: Probability }
deriving (Eq, Show)
makeLenses ''Config
defaultValue
:: (Alternative r, Applicative w)
=> b
-> Toml.Codec r w a b
-> Toml.Codec r w a b
defaultValue x = Toml.dimap Just (fromMaybe x) . Toml.dioptional
probCodec :: TomlCodec Probability
probCodec =
Probability
<$> Toml.int "assign"
.= _probAssign
<*> defaultValue 1 (Toml.int "always")
.= _probAlways
configCodec :: TomlCodec Config
configCodec =
Toml.dimap _configProbability Config $ Toml.table probCodec "probability"
parseConfigFile :: FilePath -> IO Config
parseConfigFile = Toml.decodeFile configCodec
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