new function to extract multiple properties at once in CSS.hs

and use it in Textile reader

src/Text/Pandoc/CSS.hs

@@ -1,5 +1,6 @@
-module Text.Pandoc.CSS ( foldOrElse,
+module Text.Pandoc.CSS ( foldOrElse
-                         pickStyleAttrProps
+                       , pickStyleAttrProps
+                       , pickStylesToKVs
                        )
 where
 
@@ -26,6 +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

src/Text/Pandoc/Readers/Textile.hs

@@ -537,11 +537,8 @@ image :: Parser [Char] ParserState Inlines
 image = try $ do
   char '!' >> notFollowedBy space
   (ident, cls, kvs) <- attributes
-  let getAtt k styles = case pickStyleAttrProps [k] styles of
-                          Just v  -> [(k, v)]
-                          Nothing -> []
   let attr = case lookup "style" kvs of
-               Just stls -> (ident, cls, getAtt "width" stls ++ getAtt "height" stls)
+               Just stls -> (ident, cls, pickStylesToKVs ["width", "height"] stls)
                Nothing   -> (ident, cls, kvs)
   src <- manyTill anyChar' (lookAhead $ oneOf "!(")
   alt <- option "" (try $ (char '(' >> manyTill anyChar' (char ')')))