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|
{-# LANGUAGE FlexibleContexts #-}
-----------------------------------------------------------------------------
-- |
-- Module : Xmobar.Parsers
-- Copyright : (c) Andrea Rossato
-- License : BSD-style (see LICENSE)
--
-- Maintainer : Jose A. Ortega Ruiz <jao@gnu.org>
-- Stability : unstable
-- Portability : unportable
--
-- Parsing for template substrings
--
-----------------------------------------------------------------------------
module Xmobar.X11.Parsers (parseString, Widget(..)) where
import Xmobar.Config
import Xmobar.Actions
import Control.Monad (guard, mzero)
import Text.ParserCombinators.Parsec
import Graphics.X11.Types (Button)
data Widget = Icon String | Text String
type ColorString = String
type FontIndex = Int
-- | Runs the string parser
parseString :: Config -> String
-> IO [(Widget, ColorString, FontIndex, Maybe [Action])]
parseString c s =
case parse (stringParser (fgColor c) 0 Nothing) "" s of
Left _ -> return [(Text $ "Could not parse string: " ++ s
, fgColor c
, 0
, Nothing)]
Right x -> return (concat x)
allParsers :: ColorString
-> FontIndex
-> Maybe [Action]
-> Parser [(Widget, ColorString, FontIndex, Maybe [Action])]
allParsers c f a = textParser c f a
<|> try (iconParser c f a)
<|> try (rawParser c f a)
<|> try (actionParser c f a)
<|> try (fontParser c a)
<|> colorParser f a
-- | Gets the string and combines the needed parsers
stringParser :: String -> FontIndex -> Maybe [Action]
-> Parser [[(Widget, ColorString, FontIndex, Maybe [Action])]]
stringParser c f a = manyTill (allParsers c f a) eof
-- | Parses a maximal string without color markup.
textParser :: String -> FontIndex -> Maybe [Action]
-> Parser [(Widget, ColorString, FontIndex, Maybe [Action])]
textParser c f a = do s <- many1 $
noneOf "<" <|>
try (notFollowedBy' (char '<')
(try (string "fc=") <|>
try (string "fn=") <|>
try (string "action=") <|>
try (string "/action>") <|>
try (string "icon=") <|>
try (string "raw=") <|>
try (string "/fn>") <|>
string "/fc>"))
return [(Text s, c, f, a)]
-- | Parse a "raw" tag, which we use to prevent other tags from creeping in.
-- The format here is net-string-esque: a literal "<raw=" followed by a
-- string of digits (base 10) denoting the length of the raw string,
-- a literal ":" as digit-string-terminator, the raw string itself, and
-- then a literal "/>".
rawParser :: ColorString
-> FontIndex
-> Maybe [Action]
-> Parser [(Widget, ColorString, FontIndex, Maybe [Action])]
rawParser c f a = do
string "<raw="
lenstr <- many1 digit
char ':'
case reads lenstr of
[(len,[])] -> do
guard ((len :: Integer) <= fromIntegral (maxBound :: Int))
s <- count (fromIntegral len) anyChar
string "/>"
return [(Text s, c, f, a)]
_ -> mzero
-- | 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 $ try (e >> return '*')
return x
iconParser :: String -> FontIndex -> Maybe [Action]
-> Parser [(Widget, ColorString, FontIndex, Maybe [Action])]
iconParser c f a = do
string "<icon="
i <- manyTill (noneOf ">") (try (string "/>"))
return [(Icon i, c, f, a)]
actionParser :: String -> FontIndex -> Maybe [Action]
-> Parser [(Widget, ColorString, FontIndex, Maybe [Action])]
actionParser c f act = do
string "<action="
command <- choice [between (char '`') (char '`') (many1 (noneOf "`")),
many1 (noneOf ">")]
buttons <- (char '>' >> return "1") <|> (space >> spaces >>
between (string "button=") (string ">") (many1 (oneOf "12345")))
let a = Spawn (toButtons buttons) command
a' = case act of
Nothing -> Just [a]
Just act' -> Just $ a : act'
s <- manyTill (allParsers c f a') (try $ string "</action>")
return (concat s)
toButtons :: String -> [Button]
toButtons = map (\x -> read [x])
-- | Parsers a string wrapped in a color specification.
colorParser :: FontIndex -> Maybe [Action]
-> Parser [(Widget, ColorString, FontIndex, Maybe [Action])]
colorParser f a = do
c <- between (string "<fc=") (string ">") colors
s <- manyTill (allParsers c f a) (try $ string "</fc>")
return (concat s)
-- | Parsers a string wrapped in a font specification.
fontParser :: ColorString -> Maybe [Action]
-> Parser [(Widget, ColorString, FontIndex, Maybe [Action])]
fontParser c a = do
f <- between (string "<fn=") (string ">") colors
s <- manyTill (allParsers c (read f) a) (try $ string "</fn>")
return (concat s)
-- | Parses a color specification (hex or named)
colors :: Parser String
colors = many1 (alphaNum <|> char ',' <|> char '#')
|
