diff options
Diffstat (limited to 'src/lib/Xmobar/X11/Parsers.hs')
-rw-r--r-- | src/lib/Xmobar/X11/Parsers.hs | 146 |
1 files changed, 146 insertions, 0 deletions
diff --git a/src/lib/Xmobar/X11/Parsers.hs b/src/lib/Xmobar/X11/Parsers.hs new file mode 100644 index 0000000..8c1abac --- /dev/null +++ b/src/lib/Xmobar/X11/Parsers.hs @@ -0,0 +1,146 @@ +{-# 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 '#') |