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|
-----------------------------------------------------------------------------
-- |
-- Module : Xmobar.Parsers
-- Copyright : (c) Andrea Rossato
-- License : BSD-style (see LICENSE)
--
-- Maintainer : Andrea Rossato <andrea.rossato@unibz.it>
-- Stability : unstable
-- Portability : unportable
--
-- Parsers needed for Xmobar, a text based status bar
--
-----------------------------------------------------------------------------
module Parsers
( parseString
, parseTemplate
, parseConfig
) where
import Config
import Commands
import Runnable
import Text.ParserCombinators.Parsec hiding ((<|>))
import qualified Text.ParserCombinators.Parsec as Parsec
import qualified Data.Map as Map
import Data.Foldable (sequenceA_)
import Data.List (find,inits,tails)
import Control.Applicative.Permutation(optAtom, runPermsSep)
import Control.Monad(Monad(return), mapM_, ap)
import Control.Applicative hiding (many)
-- | Runs the string parser
parseString :: Config -> String -> IO [(String, String)]
parseString c s =
case parse (stringParser (fgColor c)) "" s of
Left _ -> return [("Could not parse string: " ++ s, fgColor c)]
Right x -> return (concat x)
-- | Gets the string and combines the needed parsers
stringParser :: String -> Parser [[(String, String)]]
stringParser c = manyTill (textParser c <|> colorParser) eof
-- | Parses a maximal string without color markup.
textParser :: String -> Parser [(String, String)]
textParser c = do s <- many1 $
noneOf "<" <|>
( try $ notFollowedBy' (char '<')
(string "fc=" <|> string "/fc>" ) )
return [(s, c)]
-- | Wrapper for notFollowedBy that returns the result of the first parser.
-- Also works around the issue that, at least in Parsec 3.0.0, notFollowedBy
-- accepts only parsers with return type Char.
notFollowedBy' :: Parser a -> Parser b -> Parser a
notFollowedBy' p e = do x <- p
notFollowedBy (e >> return '*')
return x
-- | Parsers a string wrapped in a color specification.
colorParser :: Parser [(String, String)]
colorParser = do
c <- between (string "<fc=") (string ">") colors
s <- manyTill (textParser c <|> colorParser) (try $ string "</fc>")
return (concat s)
-- | Parses a color specification (hex or named)
colors :: Parser String
colors = many1 (alphaNum <|> char ',' <|> char '#')
-- | Parses the output template string
templateStringParser :: Config -> Parser (String,String,String)
templateStringParser c = do
s <- allTillSep c
com <- templateCommandParser c
ss <- allTillSep c
return (com, s, ss)
-- | Parses the command part of the template string
templateCommandParser :: Config -> Parser String
templateCommandParser c =
let chr = char . head . sepChar
in between (chr c) (chr c) (allTillSep c)
-- | Combines the template parsers
templateParser :: Config -> Parser [(String,String,String)]
templateParser = many . templateStringParser
-- | Actually runs the template parsers
parseTemplate :: Config -> String -> IO [(Runnable,String,String)]
parseTemplate c s =
do str <- case parse (templateParser c) "" s of
Left _ -> return [("","","")]
Right x -> return x
let cl = map alias (commands c)
m = Map.fromList $ zip cl (commands c)
return $ combine c m str
-- | Given a finite "Map" and a parsed templatet produces the
-- | resulting output string.
combine :: Config -> Map.Map String Runnable -> [(String, String, String)] -> [(Runnable,String,String)]
combine _ _ [] = []
combine c m ((ts,s,ss):xs) = (com, s, ss) : combine c m xs
where com = Map.findWithDefault dflt ts m
dflt = Run $ Com ts [] [] 10
allTillSep :: Config -> Parser String
allTillSep = many . noneOf . sepChar
instance Applicative (GenParser tok st) where
pure = return
(<*>) = ap
instance Alternative (GenParser tok st) where
(<|>) x y = (Parsec.<|>) (try x) y
empty = pzero
readsToParsec :: Read b => CharParser st b
readsToParsec = do
pos0 <- getPosition
input <- getInput
case reads input of
(result,rest):_ -> do
sequenceA_ $ do
ls <- fmap (lines . fst) . find ((==rest) . snd)
$ zip (inits input) (tails input)
lastLine <- safeLast ls
return $ setPosition
. flip setSourceColumn (length lastLine)
. flip incSourceLine (length ls - 1) $ pos0
setInput rest
return result
_ -> setInput input >> fail "readsToParsec failed"
safeLast :: [a] -> Maybe a
safeLast [] = Nothing
safeLast xs = Just (last xs)
-- | Parse the config
parseConfig :: String -> Either ParseError Config
parseConfig = flip parse "Config" $ sepEndSpaces ["Config","{"]
*> perms<* wrapSkip (string "}")
where
perms = runPermsSep (wrapSkip $ string ",") $ Config
<$> withDef font (strField "font")
<*> withDef bgColor (strField "bgColor")
<*> withDef fgColor (strField "fgColor")
<*> withDef position (field "position" readsToParsec)
<*> withDef lowerOnStart (field "lowerOnStart" parseEnum)
<*> withDef commands (field "commands" readsToParsec)
<*> withDef sepChar (strField "sepChar")
<*> withDef alignSep (strField "alignSep")
<*> withDef template (strField "template")
wrapSkip x = many space *> x <* many space
sepEndSpaces = mapM_ (\s -> string s <* many space)
withDef f = optAtom (f defaultConfig)
parseEnum = choice $ map (\x -> x <$ string (show x)) [minBound .. maxBound]
strField name = field name $ between (char '"') (char '"') (many1 . satisfy $ (/= '"'))
field name cont = sepEndSpaces [name,"="] *> cont
|
