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-rw-r--r--src/Xmobar/Config/Template.hs63
1 files changed, 28 insertions, 35 deletions
diff --git a/src/Xmobar/Config/Template.hs b/src/Xmobar/Config/Template.hs
index 407771d..2a5b3d7 100644
--- a/src/Xmobar/Config/Template.hs
+++ b/src/Xmobar/Config/Template.hs
@@ -17,8 +17,8 @@
module Xmobar.Config.Template (parseString) where
-import Control.Monad (guard, mzero)
import Data.Maybe (fromMaybe)
+import qualified Control.Monad as CM
import Text.Parsec ((<|>))
import Text.Read (readMaybe)
@@ -35,7 +35,8 @@ type Context = (T.TextRenderInfo, T.FontIndex, Maybe [T.Action])
retSegment :: Context -> T.Widget -> Parser [T.Segment]
retSegment (i, idx, as) widget = return [(widget, i, idx, as)]
--- | Run the template string parser
+-- | Run the template string parser for the given config, producing a list of
+-- drawable segment specifications.
parseString :: T.Config -> String -> [T.Segment]
parseString c s =
case P.parse (stringParser ci) "" s of
@@ -44,38 +45,37 @@ parseString c s =
where ci = (ti , 0, Nothing)
ti = T.TextRenderInfo (T.fgColor c) 0 0 []
--- | Top level parser reading the full template string
+-- Top level parser reading the full template string
stringParser :: Context -> Parser [[T.Segment]]
stringParser c = C.manyTill (allParsers c) C.eof
allParsers :: Context -> Parser [T.Segment]
-allParsers c = foldl (\p fn -> p <|> P.try (fn c)) (textParser c)
- [ iconParser, hspaceParser, rawParser, actionParser
- , fontParser, boxParser, colorParser]
+allParsers c = C.choice (textParser c:map (\f -> P.try (f c)) parsers)
+ where parsers = [ iconParser, hspaceParser, rawParser, actionParser
+ , fontParser, boxParser, colorParser ]
--- | 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.
+-- 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
C.notFollowedBy $ P.try (e >> return '*')
return x
--- | Parse a maximal string without markup
+-- Parse a maximal string without markup
textParser :: Context -> Parser [T.Segment]
textParser c =
- C.many1 (P.noneOf "<" <|> P.try (notFollowedBy' (P.char '<') trys'))
+ C.many1 (P.noneOf "<" <|> P.try (notFollowedBy' (P.char '<') suffixes))
>>= retSegment c . T.Text
- where trys = P.try . P.string
- trys' = foldl (\p s -> p <|> trys s) (trys "fc=")
- [ "box", "fn=", "action=", "/action>", "icon="
- , "hspace=", "raw=", "/fn>", "/box>", "/fc>"]
-
--- | 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 "/>".
+ where suffixes = C.choice $ map (P.try . P.string)
+ [ "icon=" , "hspace=", "raw="
+ , "action=", "/action>", "fn=", "/fn>"
+ , "box", "/box>", "fc=", "/fc>" ]
+
+-- 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 :: Context -> Parser [T.Segment]
rawParser c = do
P.string "<raw="
@@ -83,11 +83,11 @@ rawParser c = do
P.char ':'
case reads lenstr of
[(len,[])] -> do
- guard ((len :: Integer) <= fromIntegral (maxBound :: Int))
+ CM.guard ((len :: Integer) <= fromIntegral (maxBound :: Int))
s <- C.count (fromIntegral len) P.anyChar
P.string "/>"
retSegment c (T.Text s)
- _ -> mzero
+ _ -> CM.mzero
iconParser :: Context -> Parser [T.Segment]
iconParser c = do
@@ -104,8 +104,8 @@ hspaceParser c = do
actionParser :: Context -> Parser [T.Segment]
actionParser (ti, fi, act) = do
P.string "<action="
- command <- C.choice [C.between (P.char '`') (P.char '`') (C.many1 (P.noneOf "`")),
- C.many1 (P.noneOf ">")]
+ command <- C.choice [C.between (P.char '`') (P.char '`') (C.many1 (P.noneOf "`"))
+ , C.many1 (P.noneOf ">")]
buttons <- (P.char '>' >> return "1") <|> (P.space >> P.spaces >>
C.between (P.string "button=") (P.string ">") (C.many1 (P.oneOf "12345")))
let a = T.Spawn (toButtons buttons) command
@@ -118,10 +118,9 @@ actionParser (ti, fi, act) = do
toButtons :: String -> [T.Button]
toButtons = map (\x -> read [x])
--- | Parse a string wrapped in a color specification
colorParser :: Context -> Parser [T.Segment]
colorParser (T.TextRenderInfo _ _ _ bs, fidx, a) = do
- c <- C.between (P.string "<fc=") (P.string ">") colors
+ c <- C.between (P.string "<fc=") (P.string ">") (C.many1 colorc)
let colorParts = break (==':') c
let (ot,ob) = case break (==',') (drop 1 $ snd colorParts) of
(top,',':btm) -> (top, btm)
@@ -132,17 +131,12 @@ colorParser (T.TextRenderInfo _ _ _ bs, fidx, a) = do
bs
s <- C.manyTill (allParsers (tri, fidx, a)) (P.try $ P.string "</fc>")
return (concat s)
- where colors = C.many1 (P.alphaNum <|> P.char ',' <|> P.char ':' <|> P.char '#')
+ where colorc = P.alphaNum <|> P.oneOf ",:#"
--- | Parse a string wrapped in a box specification
boxParser :: Context -> Parser [T.Segment]
boxParser (T.TextRenderInfo cs ot ob bs, f, a) = do
c <- C.between (P.string "<box") (P.string ">")
- (C.option "" (C.many1 (P.alphaNum
- <|> P.char '='
- <|> P.char ' '
- <|> P.char '#'
- <|> P.char ',')))
+ (C.option "" (C.many1 (P.alphaNum <|> P.oneOf "= #,")))
let b = T.Box T.BBFull (T.BoxOffset T.C 0) 1 cs (T.BoxMargins 0 0 0 0)
let g = boxReader b (words c)
s <- C.manyTill
@@ -186,7 +180,6 @@ boxParamReader (T.Box bb off lw fc mgs@(T.BoxMargins mt mr mb ml)) ('m':pos) v =
boxParamReader b _ _ = b
--- | Parse a string wrapped in a font specification
fontParser :: Context -> Parser [T.Segment]
fontParser (i, _, a) = do
f <- C.between (P.string "<fn=") (P.string ">") (C.many1 P.digit)