78 lines
2.3 KiB
Haskell
78 lines
2.3 KiB
Haskell
module LangFilter where
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import Lang
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import Ebnf
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import Spans
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import Glosses
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import Text.Pandoc.Definition
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import Text.Pandoc.Walk
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import Data.Maybe
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import qualified Data.Map as Map
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import Data.Text (Text)
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import qualified Data.Text as Text
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import Control.Applicative
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import Control.Monad
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langFilter :: Text -> Pandoc -> IO Pandoc
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langFilter col p@(Pandoc (Meta m) _) = do
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lang <- toLang $ Map.lookup "conlang" m
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let ?lang = lang
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let ?defColor = col
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let f = map (walk spans . fixFigureClass . makeEbnf .
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makeQuotes . letterList) .
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concatMap (makeBlocks <=< glosses)
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pure $ walk f p
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pluck :: Eq a => a -> [a] -> Maybe [a]
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pluck _ [] = Nothing
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pluck x (y:ys) | x == y = Just ys
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| otherwise = (x :) <$> pluck x ys
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pluck1 :: Eq a => [a] -> [a] -> Maybe (a, [a])
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pluck1 [] _ = Nothing
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pluck1 (x:xs) ys = (x,) <$> pluck x ys <|> pluck1 xs ys
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fixFigureClass :: Block -> Block
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fixFigureClass (Figure (_, c1, a1) cap [Plain [Image (i, c2, a2) alt path]]) =
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Figure (i, c1 ++ c2, a1 ++ a2) cap [Plain [Image ("", [], []) alt path]]
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fixFigureClass b = b
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makeBlocks :: Block -> [Block]
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makeBlocks (Div ("", clss, []) blks)
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| Just (cls, rest) <- pluck1 ["figure", "aside"] clss =
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let html = RawBlock $ Format "html"
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open = if null rest then
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html $ "<" <> cls <> ">"
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else
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html $ "<" <> cls <> " class='" <> Text.unwords rest <> "'>"
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close = html $ "</" <> cls <> ">"
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in
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[open] ++ blks ++ [close]
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makeBlocks b = [b]
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makeQuotes :: Block -> Block
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makeQuotes para@(Para b) = fromMaybe para $ do
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inner <- split b
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return (BlockQuote [Para inner])
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where
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isDelim str = Text.length str == 3 && Text.all isQuote str
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isQuote c = c == '"' || c == '“' || c == '”'
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split (Str begin:SoftBreak:rest) = guard (isDelim begin) *> checkEnd rest
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split _ = empty
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checkEnd [SoftBreak, Str end] = [] <$ guard (isDelim end)
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checkEnd (start:rest) = (start :) <$> checkEnd rest
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checkEnd _ = empty
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makeQuotes other = other
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letterList :: Block -> Block
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letterList (Div a@(_, cs, _) blks)
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| "letter-list" `elem` cs = Div a (walk go blks)
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where
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go (Para xs) = Plain xs
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go b = b
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letterList b = b
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