95 lines
3.9 KiB
Haskell
95 lines
3.9 KiB
Haskell
module Text.Pandoc.Readers.OPML ( readOPML ) where
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import Data.Char (toUpper)
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import Text.Pandoc.Options
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import Text.Pandoc.Definition
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import Text.Pandoc.Builder
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import Text.Pandoc.Readers.HTML (readHtml)
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import Text.Pandoc.Readers.Markdown (readMarkdown)
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import Text.XML.Light
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import Text.Pandoc.Compat.TagSoupEntity (lookupEntity)
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import Data.Generics
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import Data.Monoid
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import Control.Monad.State
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import Control.Applicative ((<$>), (<$))
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type OPML = State OPMLState
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data OPMLState = OPMLState{
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opmlSectionLevel :: Int
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, opmlDocTitle :: Inlines
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, opmlDocAuthors :: [Inlines]
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, opmlDocDate :: Inlines
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} deriving Show
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readOPML :: ReaderOptions -> String -> Pandoc
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readOPML _ inp = setTitle (opmlDocTitle st')
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$ setAuthors (opmlDocAuthors st')
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$ setDate (opmlDocDate st')
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$ doc $ mconcat bs
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where (bs, st') = runState (mapM parseBlock $ normalizeTree $ parseXML inp)
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OPMLState{ opmlSectionLevel = 0
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, opmlDocTitle = mempty
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, opmlDocAuthors = []
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, opmlDocDate = mempty
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}
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-- normalize input, consolidating adjacent Text and CRef elements
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normalizeTree :: [Content] -> [Content]
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normalizeTree = everywhere (mkT go)
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where go :: [Content] -> [Content]
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go (Text (CData CDataRaw _ _):xs) = xs
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go (Text (CData CDataText s1 z):Text (CData CDataText s2 _):xs) =
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Text (CData CDataText (s1 ++ s2) z):xs
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go (Text (CData CDataText s1 z):CRef r:xs) =
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Text (CData CDataText (s1 ++ convertEntity r) z):xs
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go (CRef r:Text (CData CDataText s1 z):xs) =
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Text (CData CDataText (convertEntity r ++ s1) z):xs
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go (CRef r1:CRef r2:xs) =
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Text (CData CDataText (convertEntity r1 ++ convertEntity r2) Nothing):xs
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go xs = xs
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convertEntity :: String -> String
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convertEntity e = maybe (map toUpper e) (:[]) (lookupEntity e)
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-- convenience function to get an attribute value, defaulting to ""
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attrValue :: String -> Element -> String
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attrValue attr elt =
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case lookupAttrBy (\x -> qName x == attr) (elAttribs elt) of
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Just z -> z
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Nothing -> ""
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asHtml :: String -> Inlines
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asHtml s = case readHtml def s of
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Pandoc _ [Plain ils] -> fromList ils
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_ -> mempty
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asMarkdown :: String -> Blocks
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asMarkdown s = fromList bs
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where Pandoc _ bs = readMarkdown def s
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getBlocks :: Element -> OPML Blocks
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getBlocks e = mconcat <$> (mapM parseBlock $ elContent e)
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parseBlock :: Content -> OPML Blocks
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parseBlock (Elem e) =
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case qName (elName e) of
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"ownerName" -> mempty <$ modify (\st ->
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st{opmlDocAuthors = [text $ strContent e]})
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"dateModified" -> mempty <$ modify (\st ->
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st{opmlDocDate = text $ strContent e})
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"title" -> mempty <$ modify (\st ->
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st{opmlDocTitle = text $ strContent e})
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"outline" -> gets opmlSectionLevel >>= sect . (+1)
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"?xml" -> return mempty
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_ -> getBlocks e
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where sect n = do let headerText = asHtml $ attrValue "text" e
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let noteBlocks = asMarkdown $ attrValue "_note" e
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modify $ \st -> st{ opmlSectionLevel = n }
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bs <- getBlocks e
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modify $ \st -> st{ opmlSectionLevel = n - 1 }
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let headerText' = case map toUpper (attrValue "type" e) of
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"LINK" -> link
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(attrValue "url" e) "" headerText
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_ -> headerText
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return $ header n headerText' <> noteBlocks <> bs
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parseBlock _ = return mempty
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