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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 (
-- * Parsing
-- $parser
parseString
, stringParser
, defaultColors
, colorsAndText
, templateStringParser
, templateCommandParser
, templateParser
, parseTemplate
) where
import Config
import Commands
import Runnable
import Text.ParserCombinators.Parsec
import qualified Data.Map as Map
{- $parser
These are the neede parsers. Don't trust them too much.
There are parsers for the commands output and parsers for the
formatting template.
-}
-- | Runs the actual string parsers
parseString :: Config -> String -> IO [(String, String)]
parseString c s =
case (parse (stringParser 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 :: Config -> Parser [[(String, String)]]
stringParser c = manyTill (defaultColors c) eof
-- | Parses a string with the default color (no color set)
defaultColors :: Config -> Parser [(String, String)]
defaultColors c = do
s <- manyTill anyChar (tryString "<fc" <|> endOfLine "")
n <- colorsAndText <|> endOfLine ("","")
return [(s,fgColor c),n]
-- | Parses a string with a color set
colorsAndText :: Parser (String, String)
colorsAndText = do
string "="
c <- colorSpec
string ">"
s <- manyTill anyChar (tryString "</fc>")
return (s,c)
endOfLine :: a -> Parser a
endOfLine r = eof >> return r
tryString :: String -> Parser String
tryString = try . string
-- | Parses a color specification (hex or named)
colorSpec :: Parser String
colorSpec = many1 (alphaNum <|> char ',' <|> char '#')
-- | Parses the output template string
templateStringParser :: Config -> Parser (String,String,String)
templateStringParser c = do
s <- many $ noneOf (sepChar c)
(com,_,_) <- templateCommandParser c
ss <- many $ noneOf (sepChar c)
return (com, s, ss)
-- | Parses the command part of the template string
templateCommandParser :: Config -> Parser (String,String,String)
templateCommandParser c = do
let chr = head $ sepChar c
char chr
com <- many $ noneOf (sepChar c)
char chr
return $ (com,"","")
-- | Combines the template parsers
templateParser :: Config -> Parser [(String,String,String)]
templateParser c = many (templateStringParser c)
-- | Actually runs the template parsers
parseTemplate :: Config -> String -> IO [(Runnable,String,String)]
parseTemplate config s =
do str <- case (parse (templateParser config) "" s) of
Left _ -> return [("","","")]
Right x -> return x
let comList = map alias (commands config)
m = Map.fromList $ zip comList (commands config)
return $ combine config 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 config m ((ts,s,ss):xs) =
[(com, s, ss)] ++ combine config m xs
where com = Map.findWithDefault dflt ts m
dflt = Run $ Com ts [] [] 10
|
