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
192
193
194
|
{-# 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
--
-- Parsers needed for Xmobar, a text based status bar
--
-----------------------------------------------------------------------------
module Xmobar.Parsers
( parseString
, parseTemplate
, Widget(..)
) where
import Xmobar.Config
import Xmobar.Runnable
import Xmobar.Commands
import Xmobar.Actions
import Control.Monad (guard, mzero)
import qualified Data.Map as Map
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 '#')
-- | 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 [("", s, "")]
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 template produce 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
|
