{-# LANGUAGE FlexibleInstances #-} {-# LANGUAGE OverloadedStrings #-} module Commonmark.Extensions.Subscript ( HasSubscript(..) , subscriptSpec ) where import Commonmark.Types import Commonmark.Syntax import Commonmark.Inlines import Commonmark.SourceMap import Commonmark.Html subscriptSpec :: (Monad m, IsBlock il bl, IsInline il, HasSubscript il) => SyntaxSpec m il bl subscriptSpec :: forall (m :: * -> *) il bl. (Monad m, IsBlock il bl, IsInline il, HasSubscript il) => SyntaxSpec m il bl subscriptSpec = forall a. Monoid a => a mempty { syntaxFormattingSpecs :: [FormattingSpec il] syntaxFormattingSpecs = [ forall il. Char -> Bool -> Bool -> Maybe (il -> il) -> Maybe (il -> il) -> Char -> FormattingSpec il FormattingSpec Char '~' Bool True Bool True (forall a. a -> Maybe a Just forall a. HasSubscript a => a -> a subscript) forall a. Maybe a Nothing Char '~' ] } class HasSubscript a where subscript :: a -> a instance HasSubscript (Html a) where subscript :: Html a -> Html a subscript Html a x = forall a. Text -> Maybe (Html a) -> Html a htmlInline Text "sub" (forall a. a -> Maybe a Just Html a x) instance (HasSubscript i, Monoid i) => HasSubscript (WithSourceMap i) where subscript :: WithSourceMap i -> WithSourceMap i subscript WithSourceMap i x = (forall a. HasSubscript a => a -> a subscript forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b <$> WithSourceMap i x) forall (f :: * -> *) a b. Applicative f => f a -> f b -> f a <* Text -> WithSourceMap () addName Text "subscript"