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-rw-r--r--src/Text/Pandoc/CSS.hs21
1 files changed, 15 insertions, 6 deletions
diff --git a/src/Text/Pandoc/CSS.hs b/src/Text/Pandoc/CSS.hs
index 9d0c84243..f479ed9d0 100644
--- a/src/Text/Pandoc/CSS.hs
+++ b/src/Text/Pandoc/CSS.hs
@@ -1,5 +1,6 @@
-module Text.Pandoc.CSS ( foldOrElse,
- pickStyleAttrProps
+module Text.Pandoc.CSS ( foldOrElse
+ , pickStyleAttrProps
+ , pickStylesToKVs
)
where
@@ -10,13 +11,11 @@ import Text.Parsec.String
ruleParser :: Parser (String, String)
ruleParser = do
p <- many1 (noneOf ":") <* char ':'
- v <- many1 (noneOf ":;") <* char ';' <* spaces
+ v <- many1 (noneOf ":;") <* (optional $ char ';') <* spaces
return (trim p, trim v)
styleAttrParser :: Parser [(String, String)]
-styleAttrParser = do
- p <- many1 ruleParser
- return p
+styleAttrParser = many1 ruleParser
orElse :: Eq a => a -> a -> a -> a
orElse v x y = if v == x then y else x
@@ -28,6 +27,16 @@ eitherToMaybe :: Either a b -> Maybe b
eitherToMaybe (Right x) = Just x
eitherToMaybe _ = Nothing
+-- | takes a list of keys/properties and a CSS string and
+-- returns the corresponding key-value-pairs.
+pickStylesToKVs :: [String] -> String -> [(String, String)]
+pickStylesToKVs props styleAttr =
+ case parse styleAttrParser "" styleAttr of
+ Left _ -> []
+ Right styles -> filter (\s -> fst s `elem` props) styles
+
+-- | takes a list of key/property synonyms and a CSS string and maybe
+-- returns the value of the first match (in order of the supplied list)
pickStyleAttrProps :: [String] -> String -> Maybe String
pickStyleAttrProps lookupProps styleAttr = do
styles <- eitherToMaybe $ parse styleAttrParser "" styleAttr