queryparser-0.1.0.0: src/Database/Sql/Helpers.hs
-- Copyright (c) 2017 Uber Technologies, Inc.
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module Database.Sql.Helpers where
import Database.Sql.Position
import Text.Parsec (ParsecT, Stream, option, optionMaybe)
import qualified Text.Parsec as P
import Data.Semigroup (Semigroup, sconcat, (<>))
import Data.List.NonEmpty (NonEmpty ((:|)))
consumeOrderedOptions :: (Stream s m t, Semigroup a) => a -> [ParsecT s u m a] -> ParsecT s u m a
consumeOrderedOptions defaultVal optionPs = do
let v = defaultVal
vs <- sequence $ map (option v) optionPs
pure $ sconcat $ v :| vs
-- the options may appear in any order, but may only appear once.
consumeUnorderedOptions :: (Stream s m t, Semigroup a) => a -> [ParsecT s u m a] -> ParsecT s u m a
consumeUnorderedOptions defaultVal optionPs = go defaultVal optionPs []
where
go v [] _ = return v
go v untriedPs triedPs = do
let candidateP:remainingPs = untriedPs
optionMaybe candidateP >>= \case
Just v' -> go (v <> v') (remainingPs ++ triedPs) []
Nothing -> go v remainingPs (candidateP:triedPs)
eof :: (Stream s m t, Show t, Integral u) => ParsecT s u m Range
eof = do
_ <- P.eof
p <- position
return $ Range p p
where
position = do
sourcePos <- P.getPosition
offset <- P.getState
let positionLine = fromIntegral $ P.sourceLine sourcePos
positionColumn = fromIntegral $ P.sourceColumn sourcePos
positionOffset = fromIntegral $ offset
return Position{..}