blob: 5cb3b16d9dc06963f640463a24fba18d7d20915c (
plain)
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
|
module Text.Hakyll.CompressCSS
( compressCSS
) where
import Data.List
import Text.Regex
-- | Compress CSS to speed up your site.
compressCSS :: String -> String
compressCSS = compressSeparators
. compressWhitespace
. stripComments
-- | Compresses certain forms of separators.
compressSeparators :: String -> String
compressSeparators str = subRegex (mkRegex "\\s*([;:])\\s*") str "\\1"
-- | Compresses all whitespace.
compressWhitespace :: String -> String
compressWhitespace str = subRegex (mkRegex "\\s\\s*") str " "
-- | Function that strips CSS comments away.
stripComments :: String -> String
stripComments [] = []
stripComments str | isPrefixOf "/*" str = stripComments $ eatComments $ drop 2 str
| otherwise = (head str) : (stripComments $ tail str)
where eatComments str' | null str' = []
| isPrefixOf "*/" str' = drop 2 str'
| otherwise = eatComments $ tail str'
|
