khibino/haskell-relational-record
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switch to Except type of transformers-compat.

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This commit is contained in:
Kei Hibino 2017-01-05 12:24:39 +09:00
parent 599b247ebc
commit 554211d933
2 changed files with 7 additions and 7 deletions
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13
text-postgresql/src/Text/Parser/List.hs
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@ -8,27 +8,26 @@ module Text.Parser.List
import Control.Applicative (pure)
import Control.Monad (guard)
import Control.Monad.Trans.State.Strict (StateT (..), evalStateT, get, put)
import Control.Monad.Trans.Except (Except, runExcept, withExcept, throwE)
import Data.Monoid (Last (..))
import Data.Maybe (fromMaybe)
import Control.Monad.Either.Plus (EitherP (..), emap, leftP)
type Error = Last String
unError :: String -> Error -> String
unError s = fromMaybe s . getLast
type Parser t = StateT [t] (EitherP Error)
type Parser t = StateT [t] (Except Error)
runParser :: Parser t a -> [t] -> Either String (a, [t])
runParser p = unEitherP . emap (unError "runParser: parse error.") . runStateT p
runParser p = runExcept . withExcept (unError "runParser: parse error.") . runStateT p
evalParser :: Parser t a -> [t] -> Either String a
evalParser p = unEitherP . emap (unError "evalParser: parse error.") . evalStateT p
evalParser p = runExcept . withExcept (unError "evalParser: parse error.") . evalStateT p
errorE :: String -> EitherP Error a
errorE = leftP . Last . Just
errorE :: String -> Except Error a
errorE = throwE . Last . Just
errorP :: String -> Parser t a
errorP = StateT . const . errorE

1
text-postgresql/text-postgresql.cabal
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@ -32,6 +32,7 @@ library
build-depends: base <5
, transformers
, transformers-compat
, dlist
hs-source-dirs: src
default-language: Haskell2010