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FB2 reader: parse notes

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Closes #5493
This commit is contained in:
Alexander Krotov 2019-05-11 05:15:19 +03:00 committed by Alexander
parent e9343b96bc
commit c1d9cf7daf
1 changed files with 51 additions and 3 deletions
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54
src/Text/Pandoc/Readers/FB2.hs
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@ -31,6 +31,7 @@ import Data.Char (isSpace, toUpper)
import Data.Functor
import Data.List (dropWhileEnd, intersperse)
import Data.List.Split (splitOn)
import qualified Data.Map as M
import Data.Text (Text)
import Data.Default
import Data.Maybe
@ -48,12 +49,14 @@ type FB2 m = StateT FB2State m
data FB2State = FB2State{ fb2SectionLevel :: Int
, fb2Meta :: Meta
, fb2Authors :: [String]
, fb2Notes :: M.Map String Blocks
} deriving Show
instance Default FB2State where
def = FB2State{ fb2SectionLevel = 1
, fb2Meta = mempty
, fb2Authors = []
, fb2Notes = M.empty
}
instance HasMeta FB2State where
@ -107,16 +110,56 @@ parseSubtitle e = headerWith ("", ["unnumbered"], []) <$> gets fb2SectionLevel <
parseRootElement :: PandocMonad m => Element -> FB2 m Blocks
parseRootElement e =
case qName $ elName e of
"FictionBook" -> mconcat <$> mapM parseFictionBookChild (elChildren e)
"FictionBook" -> do
-- Parse notes before parsing the rest of the content.
case filterChild isNotesBody e of
Nothing -> pure ()
Just notesBody -> parseNotesBody notesBody
-- Parse metadata and content
mconcat <$> mapM parseFictionBookChild (elChildren e)
name -> report (UnexpectedXmlElement name "root") $> mempty
-- | Parse notes
parseNotesBody :: PandocMonad m => Element -> FB2 m ()
parseNotesBody e = mempty <$ mapM parseNotesBodyChild (elChildren e)
-- | Parse a child of @\<body name="notes">@ element.
parseNotesBodyChild :: PandocMonad m => Element -> FB2 m ()
parseNotesBodyChild e =
case qName $ elName e of
"section" -> parseNote e
_ -> pure ()
isNotesBody :: Element -> Bool
isNotesBody e =
qName (elName e) == "body" &&
findAttr (unqual "name") e == Just "notes"
parseNote :: PandocMonad m => Element -> FB2 m ()
parseNote e =
case findAttr (unqual "id") e of
Nothing -> pure ()
Just sectionId -> do
content <- mconcat <$> mapM parseSectionChild (dropTitle $ elChildren e)
oldNotes <- gets fb2Notes
modify $ \s -> s { fb2Notes = M.insert ("#" ++ sectionId) content oldNotes }
pure ()
where
isTitle x = qName (elName x) == "title"
dropTitle (x:xs) = if isTitle x
then xs -- Drop note section <title> if present
else (x:xs)
dropTitle [] = []
-- | Parse a child of @\<FictionBook>@ element.
parseFictionBookChild :: PandocMonad m => Element -> FB2 m Blocks
parseFictionBookChild e =
case qName $ elName e of
"stylesheet" -> pure mempty -- stylesheet is ignored
"description" -> mempty <$ mapM_ parseDescriptionChild (elChildren e)
"body" -> mconcat <$> mapM parseBodyChild (elChildren e)
"body" -> if isNotesBody e
then pure mempty
else mconcat <$> mapM parseBodyChild (elChildren e)
"binary" -> mempty <$ parseBinaryElement e
name -> report (UnexpectedXmlElement name "FictionBook") $> mempty
@ -333,8 +376,13 @@ parseNamedStyleChild x = parseInline x
parseLinkType :: PandocMonad m => Element -> FB2 m Inlines
parseLinkType e = do
content <- mconcat <$> mapM parseStyleLinkType (elContent e)
notes <- gets fb2Notes
case findAttr (QName "href" (Just "http://www.w3.org/1999/xlink") Nothing) e of
Just href -> pure $ link href "" content
Just href -> case findAttr (QName "type" Nothing Nothing) e of
Just "note" -> case M.lookup href notes of
Nothing -> pure $ link href "" content
Just contents -> pure $ note contents
_ -> pure $ link href "" content
Nothing -> throwError $ PandocParseError "Couldn't parse FB2 file: link without required href."
-- | Parse @styleLinkType@