diff options
Diffstat (limited to 'src/Text/Pandoc/Writers/EPUB.hs')
| -rw-r--r-- | src/Text/Pandoc/Writers/EPUB.hs | 61 |
1 files changed, 55 insertions, 6 deletions
diff --git a/src/Text/Pandoc/Writers/EPUB.hs b/src/Text/Pandoc/Writers/EPUB.hs index cd4b3fce6..d139c010c 100644 --- a/src/Text/Pandoc/Writers/EPUB.hs +++ b/src/Text/Pandoc/Writers/EPUB.hs @@ -40,13 +40,13 @@ import System.Time import Text.Pandoc.Shared hiding ( Element ) import Text.Pandoc.Definition import Text.Pandoc.Generic -import Control.Monad (liftM) +import Control.Monad.State import Text.XML.Light hiding (ppTopElement) import Text.Pandoc.UUID import Text.Pandoc.Writers.HTML import Text.Pandoc.Writers.Markdown ( writePlain ) import Data.Char ( toLower ) -import Network.URI ( unEscapeString, isRelativeReference ) +import Network.URI ( unEscapeString ) -- | Produce an EPUB file from a Pandoc document. writeEPUB :: Maybe String -- ^ EPUB stylesheet specified at command line @@ -104,12 +104,16 @@ writeEPUB mbStylesheet opts doc@(Pandoc meta _) = do -- body pages let isH1 (Header 1 _) = True isH1 _ = False - let h1Indices = dropWhile (== 0) $ findIndices isH1 blocks - let chunks = splitByIndices h1Indices blocks + -- internal reference IDs change when we chunk the file, + -- so the next two lines fix that: + let reftable = correlateRefs blocks + let blocks' = replaceRefs reftable blocks + let h1Indices = dropWhile (== 0) $ findIndices isH1 blocks' + let chunks = splitByIndices h1Indices blocks' let titleize (Header 1 xs : ys) = Pandoc meta{docTitle = xs} ys titleize xs = Pandoc meta xs - let chapToHtml = writeHtmlString opts'{ writerTemplate = pageTemplate } let chapters = map titleize chunks + let chapToHtml = writeHtmlString opts'{ writerTemplate = pageTemplate } let chapterToEntry :: Int -> Pandoc -> Entry chapterToEntry num chap = mkEntry ("ch" ++ show num ++ ".xhtml") $ fromString $ chapToHtml chap @@ -271,7 +275,6 @@ transformInlines (MathML _) _ _ (x@(Math _ _) : xs) = do result = if "<math" `isPrefixOf` mathml then inOps else mathml return $ RawInline "html" result : xs transformInlines _ _ _ (RawInline _ _ : xs) = return $ Str "" : xs -transformInlines _ _ _ (Link lab (src,_) : xs) | isRelativeReference src = return $ lab ++ xs transformInlines _ _ _ xs = return xs transformBlock :: Block -> Block @@ -305,3 +308,49 @@ imageTypeOf x = case drop 1 (map toLower (takeExtension x)) of "svg" -> Just "image/svg+xml" _ -> Nothing + +data IdentState = IdentState{ + chapterNumber :: Int, + runningIdents :: [String], + chapterIdents :: [String], + identTable :: [(String,String)] + } deriving (Read, Show) + +-- Go through a block list and construct a table +-- correlating the automatically constructed references +-- that would be used in a normal pandoc document with +-- new URLs to be used in the EPUB. For example, what +-- was "header-1" might turn into "ch6.xhtml#header". +correlateRefs :: [Block] -> [(String,String)] +correlateRefs bs = identTable $ execState (mapM_ go bs) + IdentState{ chapterNumber = 0 + , runningIdents = [] + , chapterIdents = [] + , identTable = [] } + where go :: Block -> State IdentState () + go (Header n ils) = do + when (n == 1) $ + modify $ \s -> s{ chapterNumber = chapterNumber s + 1 + , chapterIdents = [] } + st <- get + let runningid = uniqueIdent ils (runningIdents st) + let chapid = if n == 1 + then Nothing + else Just $ uniqueIdent ils (chapterIdents st) + modify $ \s -> s{ runningIdents = runningid : runningIdents st + , chapterIdents = maybe (chapterIdents st) + (: chapterIdents st) chapid + , identTable = (runningid, "ch" ++ show (chapterNumber st) ++ + ".xhtml" ++ maybe "" ('#':) chapid) : identTable st + } + go _ = return () + +-- Replace internal link references using the table produced +-- by correlateRefs. +replaceRefs :: [(String,String)] -> [Block] -> [Block] +replaceRefs refTable = bottomUp replaceOneRef + where replaceOneRef x@(Link lab ('#':xs,tit)) = + case lookup xs refTable of + Just url -> Link lab (url,tit) + Nothing -> x + replaceOneRef x = x |