module Text.Pandoc.Writers.Math ( texMathToInlines , convertMath , defaultMathJaxURL , defaultKaTeXURL ) where import Text.Pandoc.Class import Text.Pandoc.Definition import Text.Pandoc.Logging import Text.TeXMath (DisplayType (..), Exp, readTeX, writePandoc) -- | Converts a raw TeX math formula to a list of 'Pandoc' inlines. -- Defaults to raw formula between @$@ or @$$@ characters if entire formula -- can't be converted. texMathToInlines :: PandocMonad m => MathType -> String -- ^ String to parse (assumes @'\n'@ line endings) -> m [Inline] texMathToInlines mt inp = do res <- convertMath writePandoc mt inp case res of Right (Just ils) -> return ils Right (Nothing) -> do report $ CouldNotConvertTeXMath inp "" return [mkFallback mt inp] Left il -> return [il] mkFallback :: MathType -> String -> Inline mkFallback mt str = Str (delim ++ str ++ delim) where delim = case mt of DisplayMath -> "$$" InlineMath -> "$" -- | Converts a raw TeX math formula using a writer function, -- issuing a warning and producing a fallback (a raw string) -- on failure. convertMath :: PandocMonad m => (DisplayType -> [Exp] -> a) -> MathType -> String -> m (Either Inline a) convertMath writer mt str = do case writer dt <$> readTeX str of Right r -> return (Right r) Left e -> do report $ CouldNotConvertTeXMath str e return (Left $ mkFallback mt str) where dt = case mt of DisplayMath -> DisplayBlock InlineMath -> DisplayInline defaultMathJaxURL :: String defaultMathJaxURL = "https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.0/" defaultKaTeXURL :: String defaultKaTeXURL = "https://cdnjs.cloudflare.com/ajax/libs/KaTeX/0.6.0/"