1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
|
{-# LANGUAGE FlexibleContexts, GeneralizedNewtypeDeriving #-}
-----------------------------------------------------------------------------
-- |
-- Module : Xmobar.Parsers
-- Copyright : (c) Andrea Rossato
-- License : BSD-style (see LICENSE)
--
-- Maintainer : Andrea Rossato <andrea.rossato@unibz.it>
-- Stability : unstable
-- Portability : unportable
--
-- Parsers needed for Xmobar, a text based status bar
--
-----------------------------------------------------------------------------
module Parsers
( parseString
, parseTemplate
, parseConfig
) where
import Config
import Runnable
import Commands
import Control.Monad.Writer(mapM_, ap, liftM, liftM2, MonadWriter, tell)
import Control.Applicative.Permutation(optAtom, runPermsSep)
import Control.Applicative(Applicative, (<*>), Alternative, empty, (<$), (<$>))
import qualified Control.Applicative
import Data.List(tails, find, inits)
import qualified Data.Map as Map
import Text.ParserCombinators.Parsec as Parsec
-- | Runs the string parser
parseString :: Config -> String -> IO [(String, String)]
parseString c s =
case parse (stringParser (fgColor c)) "" s of
Left _ -> return [("Could not parse string: " ++ s, fgColor c)]
Right x -> return (concat x)
-- | Gets the string and combines the needed parsers
stringParser :: String -> Parser [[(String, String)]]
stringParser c = manyTill (textParser c <|> colorParser) eof
-- | Parses a maximal string without color markup.
textParser :: String -> Parser [(String, String)]
textParser c = do s <- many1 $
noneOf "<" <|>
( try $ notFollowedBy' (char '<')
(string "fc=" <|> string "/fc>" ) )
return [(s, c)]
-- | 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 (e >> return '*')
return x
-- | Parsers a string wrapped in a color specification.
colorParser :: Parser [(String, String)]
colorParser = do
c <- between (string "<fc=") (string ">") colors
s <- manyTill (textParser c <|> colorParser) (try $ string "</fc>")
return (concat s)
-- | Parses a color specification (hex or named)
colors :: Parser String
colors = many1 (alphaNum <|> char ',' <|> char '#')
-- | Parses the output template string
templateStringParser :: Config -> Parser (String,String,String)
templateStringParser c = do
s <- allTillSep c
com <- templateCommandParser c
ss <- allTillSep c
return (com, s, ss)
-- | Parses the command part of the template string
templateCommandParser :: Config -> Parser String
templateCommandParser c =
let chr = char . head . sepChar
in between (chr c) (chr c) (allTillSep c)
-- | Combines the template parsers
templateParser :: Config -> Parser [(String,String,String)]
templateParser = many . templateStringParser
-- | Actually runs the template parsers
parseTemplate :: Config -> String -> IO [(Runnable,String,String)]
parseTemplate c s =
do str <- case parse (templateParser c) "" s of
Left _ -> return [("","","")]
Right x -> return x
let cl = map alias (commands c)
m = Map.fromList $ zip cl (commands c)
return $ combine c m str
-- | Given a finite "Map" and a parsed templatet produces the
-- | resulting output string.
combine :: Config -> Map.Map String Runnable -> [(String, String, String)] -> [(Runnable,String,String)]
combine _ _ [] = []
combine c m ((ts,s,ss):xs) = (com, s, ss) : combine c m xs
where com = Map.findWithDefault dflt ts m
dflt = Run $ Com ts [] [] 10
allTillSep :: Config -> Parser String
allTillSep = many . noneOf . sepChar
newtype WrappedParser tok st a = WrappedParser { unWrapParser :: GenParser tok st a }
deriving (Functor,Monad)
instance Applicative (WrappedParser tok st) where
pure = WrappedParser . return
(<*>) x y = WrappedParser $ unWrapParser x `ap` unWrapParser y
instance Alternative (WrappedParser tok st) where
(<|>) x y = WrappedParser $ try (unWrapParser x) Parsec.<|> unWrapParser y
empty = WrappedParser pzero
readsToParsec :: Read b => CharParser st b
readsToParsec = do
pos0 <- getPosition
input <- getInput
case reads input of
(result,rest):_ -> do
maybe (return Nothing) (fmap Just) $ do
ls <- fmap (lines . fst) . find ((==rest) . snd)
$ zip (inits input) (tails input)
lastLine <- safeLast ls
return $ setPosition
. flip setSourceColumn (length lastLine)
. flip incSourceLine (length ls - 1) $ pos0
setInput rest
return result
_ -> setInput input >> fail "readsToParsec failed"
safeLast :: [a] -> Maybe a
safeLast [] = Nothing
safeLast xs = Just (last xs)
liftM9 :: (Monad m) => (a1 -> a2 -> a3 -> a4 -> a5 -> a6 -> a7 -> a8 -> a9 -> b) ->
m a1 -> m a2 -> m a3 -> m a4 -> m a5 -> m a6 -> m a7 -> m a8 -> m a9 -> m b
liftM9 fun a b c d e f g h i
= fun `liftM` a `ap` b `ap` c `ap` d `ap` e `ap` f `ap` g `ap` h `ap` i
stripComments :: String -> String
stripComments = unlines . map (drop 5 . strip False . (replicate 5 ' '++)) . lines
where strip m ('-':'-':xs) = if m then "--" ++ strip m xs else ""
strip m ('\\':xss) = case xss of
'\\':xs -> '\\' : strip m xs
_ -> strip m $ drop 1 xss
strip m ('"':xs) = '"': strip (not m) xs
strip m (x:xs) = x : strip m xs
strip _ [] = []
-- | Parse the config, logging a list of fields that were missing and replaced
-- by the default definition.
parseConfig :: MonadWriter [String] m => String -> Either ParseError (m Config)
parseConfig = parseConf "Config" . stripComments
where
parseConf = parse $ do
sepEndSpaces ["Config","{"]
x <- unWrapParser perms
wrapSkip (string "}")
eof
return x
perms = runPermsSep (WrappedParser $ wrapSkip $ string ",") $ liftM9 Config
<$> withDef font "font" strField
<*> withDef bgColor "bgColor" strField
<*> withDef fgColor "fgColor" strField
<*> withDef position "position" (field readsToParsec)
<*> withDef lowerOnStart "lowerOnStart" (field parseEnum )
<*> withDef commands "commands" (field readsToParsec)
<*> withDef sepChar "sepChar" strField
<*> withDef alignSep "alignSep" strField
<*> withDef template "template" strField
wrapSkip x = many space >> liftM2 const x (many space)
sepEndSpaces = mapM_ (\s -> liftM2 const (string s) $ many space)
withDef ext name parser = optAtom (do tell [name]; return $ ext defaultConfig)
(liftM return $ WrappedParser $ parser name)
parseEnum = choice $ map (\x -> x <$ string (show x)) [minBound .. maxBound]
strField name = flip field name $ between (char '"') (char '"') (many1 . satisfy $ (/= '"'))
field cont name = sepEndSpaces [name,"="] >> cont
|
