module Shaker.Parser(
parseCommand
)
where
import Data.Char
import Text.ParserCombinators.Parsec
import Shaker.Type
import qualified Data.Map as M
parseCommand :: String -> ShakerInput -> Either ParseError Command
parseCommand str shIn = parse (typeCommand cmd_map) "parseCommand" process_input
where cmd_map = commandMap shIn
process_input = map toLower str
typeCommand :: CommandMap -> GenParser Char st Command
typeCommand cmMap = choice [try typeEmpty, typeCommandNonEmpty cmMap]
typeCommandNonEmpty :: CommandMap -> GenParser Char st Command
typeCommandNonEmpty cmMap = typeDuration >>= \dur ->
typeMultipleAction cmMap >>= \acts ->
return (Command dur acts)
typeEmpty :: GenParser Char st Command
typeEmpty = spaces >>
notFollowedBy anyChar >>
return emptyCommand
typeMultipleAction :: CommandMap -> GenParser Char st [Action]
typeMultipleAction cmMap = many1 (typeAction cmMap)
typeAction :: CommandMap -> GenParser Char st Action
typeAction cmMap = skipMany (char ' ') >>
typeShakerAction cmMap >>= \shAct ->
optionMaybe (parseArgument cmMap) >>= \arg ->
skipMany (char ' ') >>
case arg of
Nothing -> return $ Action shAct
Just str -> return $ ActionWithArg shAct str
parseArgument :: CommandMap -> GenParser Char st String
parseArgument cmMap =
skipMany (char ' ') >>
mapM_ (\a -> notFollowedBy $ string (a++" ") ) (M.keys cmMap) >>
mapM_ (\a -> notFollowedBy $ string (a++"\n") ) (M.keys cmMap) >>
many1 (noneOf " \n") >>= \str ->
skipMany (char ' ') >>
return str
typeShakerAction :: CommandMap -> GenParser Char st ShakerAction
typeShakerAction cmMap = skipMany (char ' ') >>
choice (parseMapAction cmMap) >>= \res ->
notFollowedBy (noneOf " \n") >>
skipMany (char ' ') >> return res
typeDuration :: GenParser Char st Duration
typeDuration = skipMany (char ' ') >>
option OneShot (char '~' >> return Continuous)
parseMapAction :: CommandMap -> [GenParser Char st ShakerAction]
parseMapAction cmMap = map (\(k,v) -> try (string k) >> return v) (M.toList cmMap)