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Diffstat (limited to 'src/Xmobar/Plugins/Monitors/Common/Parsers.hs')
-rw-r--r-- | src/Xmobar/Plugins/Monitors/Common/Parsers.hs | 152 |
1 files changed, 152 insertions, 0 deletions
diff --git a/src/Xmobar/Plugins/Monitors/Common/Parsers.hs b/src/Xmobar/Plugins/Monitors/Common/Parsers.hs new file mode 100644 index 0000000..4b87a10 --- /dev/null +++ b/src/Xmobar/Plugins/Monitors/Common/Parsers.hs @@ -0,0 +1,152 @@ +------------------------------------------------------------------------------ +-- | +-- Module: Xmobar.Plugins.Monitors.Parsers +-- Copyright: (c) 2018 Jose Antonio Ortega Ruiz +-- License: BSD3-style (see LICENSE) +-- +-- Maintainer: jao@gnu.org +-- Stability: unstable +-- Portability: portable +-- Created: Sun Dec 02, 2018 04:49 +-- +-- +-- Parsing template strings +-- +------------------------------------------------------------------------------ + + +module Xmobar.Plugins.Monitors.Common.Parsers ( runP + , skipRestOfLine + , getNumbers + , getNumbersAsString + , getAllBut + , getAfterString + , skipTillString + , parseTemplate + , parseTemplate' + ) where + +import Xmobar.Plugins.Monitors.Common.Types + +import Control.Applicative ((<$>)) +import qualified Data.Map as Map +import Text.ParserCombinators.Parsec + +runP :: Parser [a] -> String -> IO [a] +runP p i = + case parse p "" i of + Left _ -> return [] + Right x -> return x + +getAllBut :: String -> Parser String +getAllBut s = + manyTill (noneOf s) (char $ head s) + +getNumbers :: Parser Float +getNumbers = skipMany space >> many1 digit >>= \n -> return $ read n + +getNumbersAsString :: Parser String +getNumbersAsString = skipMany space >> many1 digit >>= \n -> return n + +skipRestOfLine :: Parser Char +skipRestOfLine = + do many $ noneOf "\n\r" + newline + +getAfterString :: String -> Parser String +getAfterString s = + do { try $ manyTill skipRestOfLine $ string s + ; manyTill anyChar newline + } <|> return "" + +skipTillString :: String -> Parser String +skipTillString s = + manyTill skipRestOfLine $ string s + +-- | Parses the output template string +templateStringParser :: Parser (String,String,String) +templateStringParser = + do { s <- nonPlaceHolder + ; com <- templateCommandParser + ; ss <- nonPlaceHolder + ; return (s, com, ss) + } + where + nonPlaceHolder = fmap concat . many $ + many1 (noneOf "<") <|> colorSpec <|> iconSpec + +-- | Recognizes color specification and returns it unchanged +colorSpec :: Parser String +colorSpec = try (string "</fc>") <|> try ( + do string "<fc=" + s <- many1 (alphaNum <|> char ',' <|> char '#') + char '>' + return $ "<fc=" ++ s ++ ">") + +-- | Recognizes icon specification and returns it unchanged +iconSpec :: Parser String +iconSpec = try (do string "<icon=" + i <- manyTill (noneOf ">") (try (string "/>")) + return $ "<icon=" ++ i ++ "/>") + +-- | Parses the command part of the template string +templateCommandParser :: Parser String +templateCommandParser = + do { char '<' + ; com <- many $ noneOf ">" + ; char '>' + ; return com + } + +-- | Combines the template parsers +templateParser :: Parser [(String,String,String)] +templateParser = many templateStringParser --"%") + +trimTo :: Int -> String -> String -> (Int, String) +trimTo n p "" = (n, p) +trimTo n p ('<':cs) = trimTo n p' s + where p' = p ++ "<" ++ takeWhile (/= '>') cs ++ ">" + s = drop 1 (dropWhile (/= '>') cs) +trimTo 0 p s = trimTo 0 p (dropWhile (/= '<') s) +trimTo n p s = let p' = takeWhile (/= '<') s + s' = dropWhile (/= '<') s + in + if length p' <= n + then trimTo (n - length p') (p ++ p') s' + else trimTo 0 (p ++ take n p') s' + +-- | Takes a list of strings that represent the values of the exported +-- keys. The strings are joined with the exported keys to form a map +-- to be combined with 'combine' to the parsed template. Returns the +-- final output of the monitor, trimmed to MaxTotalWidth if that +-- configuration value is positive. +parseTemplate :: [String] -> Monitor String +parseTemplate l = + do t <- getConfigValue template + e <- getConfigValue export + w <- getConfigValue maxTotalWidth + ell <- getConfigValue maxTotalWidthEllipsis + let m = Map.fromList . zip e $ l + s <- parseTemplate' t m + let (n, s') = if w > 0 && length s > w + then trimTo (w - length ell) "" s + else (1, s) + return $ if n > 0 then s' else s' ++ ell + +-- | Parses the template given to it with a map of export values and combines +-- them +parseTemplate' :: String -> Map.Map String String -> Monitor String +parseTemplate' t m = + do s <- io $ runP templateParser t + combine m s + +-- | Given a finite "Map" and a parsed template t produces the +-- | resulting output string as the output of the monitor. +combine :: Map.Map String String -> [(String, String, String)] -> Monitor String +combine _ [] = return [] +combine m ((s,ts,ss):xs) = + do next <- combine m xs + str <- case Map.lookup ts m of + Nothing -> return $ "<" ++ ts ++ ">" + Just r -> let f "" = r; f n = n; in f <$> parseTemplate' r m + return $ s ++ str ++ ss ++ next |