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|
{-# LANGUAGE FlexibleContexts #-}
-----------------------------------------------------------------------------
-- |
-- Module : Xmobar.Run.Parsers
-- Copyright : (c) Andrea Rossato
-- License : BSD-style (see LICENSE)
--
-- Maintainer : Jose A. Ortega Ruiz <jao@gnu.org>
-- Stability : unstable
-- Portability : portable
--
-- Parsing for template substrings
--
-----------------------------------------------------------------------------
module Xmobar.Run.Parsers ( parseString
, colorComponents
, Segment
, Box(..)
, BoxBorder(..)
, BoxOffset(..)
, BoxMargins(..)
, TextRenderInfo(..)
, Widget(..)) where
import Control.Monad (guard, mzero)
import Data.Maybe (fromMaybe)
import Data.Int (Int32)
import Text.ParserCombinators.Parsec
import Text.Read (readMaybe)
import Foreign.C.Types (CInt)
import Xmobar.Config.Types
import Xmobar.Run.Actions
data Widget = Icon String | Text String | Hspace Int32 deriving Show
data BoxOffset = BoxOffset Align Int32 deriving (Eq, Show)
-- margins: Top, Right, Bottom, Left
data BoxMargins = BoxMargins Int32 Int32 Int32 Int32 deriving (Eq, Show)
data BoxBorder = BBTop
| BBBottom
| BBVBoth
| BBLeft
| BBRight
| BBHBoth
| BBFull
deriving ( Read, Eq, Show )
data Box = Box BoxBorder BoxOffset CInt String BoxMargins deriving (Eq, Show)
data TextRenderInfo =
TextRenderInfo { tColorsString :: String
, tBgTopOffset :: Int32
, tBgBottomOffset :: Int32
, tBoxes :: [Box]
} deriving Show
type FontIndex = Int
type Segment = (Widget, TextRenderInfo, FontIndex, Maybe [Action])
-- | Runs the string parser
parseString :: Config -> String -> IO [Segment]
parseString c s =
case parse (stringParser ci 0 Nothing) "" s of
Left _ -> return [(Text $ "Could not parse string: " ++ s
, ci
, 0
, Nothing)]
Right x -> return (concat x)
where ci = TextRenderInfo (fgColor c) 0 0 []
-- | Splits a colors string into its two components
colorComponents :: Config -> String -> (String, String)
colorComponents conf c =
case break (==',') c of
(f,',':b) -> (f, b)
(f, _) -> (f, bgColor conf)
allParsers :: TextRenderInfo
-> FontIndex
-> Maybe [Action]
-> Parser [Segment]
allParsers c f a = textParser c f a
<|> try (iconParser c f a)
<|> try (hspaceParser c f a)
<|> try (rawParser c f a)
<|> try (actionParser c f a)
<|> try (fontParser c a)
<|> try (boxParser c f a)
<|> colorParser c f a
-- | Gets the string and combines the needed parsers
stringParser :: TextRenderInfo -> FontIndex -> Maybe [Action] -> Parser [[Segment]]
stringParser c f a = manyTill (allParsers c f a) eof
-- | Parses a maximal string without markup.
textParser :: TextRenderInfo -> FontIndex -> Maybe [Action] -> Parser [Segment]
textParser c f a = do s <- many1 $
noneOf "<" <|>
try (notFollowedBy' (char '<')
(try (string "fc=") <|>
try (string "box") <|>
try (string "fn=") <|>
try (string "action=") <|>
try (string "/action>") <|>
try (string "icon=") <|>
try (string "hspace=") <|>
try (string "raw=") <|>
try (string "/fn>") <|>
try (string "/box>") <|>
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 :: TextRenderInfo
-> FontIndex
-> Maybe [Action]
-> Parser [Segment]
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 :: TextRenderInfo -> FontIndex -> Maybe [Action] -> Parser [Segment]
iconParser c f a = do
string "<icon="
i <- manyTill (noneOf ">") (try (string "/>"))
return [(Icon i, c, f, a)]
hspaceParser :: TextRenderInfo -> FontIndex -> Maybe [Action] -> Parser [Segment]
hspaceParser c f a = do
string "<hspace="
pVal <- manyTill digit (try (string "/>"))
return [(Hspace (fromMaybe 0 $ readMaybe pVal), c, f, a)]
actionParser :: TextRenderInfo -> FontIndex -> Maybe [Action] -> Parser [Segment]
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 :: TextRenderInfo -> FontIndex -> Maybe [Action] -> Parser [Segment]
colorParser (TextRenderInfo _ _ _ bs) f a = do
c <- between (string "<fc=") (string ">") colors
let colorParts = break (==':') c
let (ot,ob) = case break (==',') (Prelude.drop 1 $ snd colorParts) of
(top,',':btm) -> (top, btm)
(top, _) -> (top, top)
s <- manyTill
(allParsers (TextRenderInfo (fst colorParts) (fromMaybe (-1) $ readMaybe ot) (fromMaybe (-1) $ readMaybe ob) bs) f a)
(try $ string "</fc>")
return (concat s)
-- | Parses a string wrapped in a box specification.
boxParser :: TextRenderInfo -> FontIndex -> Maybe [Action] -> Parser [Segment]
boxParser (TextRenderInfo cs ot ob bs) f a = do
c <- between (string "<box") (string ">") (option "" (many1 (alphaNum <|> char '=' <|> char ' ' <|> char '#' <|> char ',')))
let b = Box BBFull (BoxOffset C 0) 1 cs (BoxMargins 0 0 0 0)
let g = boxReader b (words c)
s <- manyTill
(allParsers (TextRenderInfo cs ot ob (g : bs)) f a)
(try $ string "</box>")
return (concat s)
boxReader :: Box -> [String] -> Box
boxReader b [] = b
boxReader b (x:xs) = do
let (param,val) = case break (=='=') x of
(p,'=':v) -> (p, v)
(p, _) -> (p, "")
boxReader (boxParamReader b param val) xs
boxParamReader :: Box -> String -> String -> Box
boxParamReader b _ "" = b
boxParamReader (Box bb off lw fc mgs) "type" val =
Box (fromMaybe bb $ readMaybe ("BB" ++ val)) off lw fc mgs
boxParamReader (Box bb (BoxOffset alg off) lw fc mgs) "offset" (a:o) =
Box bb (BoxOffset (fromMaybe alg $ readMaybe [a]) (fromMaybe off $ readMaybe o)) lw fc mgs
boxParamReader (Box bb off lw fc mgs) "width" val =
Box bb off (fromMaybe lw $ readMaybe val) fc mgs
boxParamReader (Box bb off lw _ mgs) "color" val =
Box bb off lw val mgs
boxParamReader (Box bb off lw fc mgs@(BoxMargins mt mr mb ml)) ('m':pos) val = do
let mgs' = case pos of
"t" -> BoxMargins (fromMaybe mt $ readMaybe val) mr mb ml
"r" -> BoxMargins mt (fromMaybe mr $ readMaybe val) mb ml
"b" -> BoxMargins mt mr (fromMaybe mb $ readMaybe val) ml
"l" -> BoxMargins mt mr mb (fromMaybe ml $ readMaybe val)
_ -> mgs
Box bb off lw fc mgs'
boxParamReader b _ _ = b
-- | Parsers a string wrapped in a font specification.
fontParser :: TextRenderInfo -> Maybe [Action] -> Parser [Segment]
fontParser c a = do
f <- between (string "<fn=") (string ">") colors
s <- manyTill (allParsers c (fromMaybe 0 $ readMaybe f) a) (try $ string "</fn>")
return (concat s)
-- | Parses a color specification (hex or named)
colors :: Parser String
colors = many1 (alphaNum <|> char ',' <|> char ':' <|> char '#')
|
