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Commonmark.Html: export transform. #102

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Commonmark.Html: export transform. #102

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0cb0a5e
Commonmark.Html: export transform.
jgm Feb 3, 2023
ef35cd4
Commonmark.Html: export Html constructors and transformM.
jgm Feb 4, 2023
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18 changes: 17 additions & 1 deletion commonmark/src/Commonmark/Html.hs
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Original file line number Diff line number Diff line change
Expand Up @@ -4,7 +4,9 @@
{-# LANGUAGE FlexibleContexts #-}
{-# LANGUAGE UndecidableInstances #-}
module Commonmark.Html
( Html
( Html(..)
, ElementType(..)
, Attribute
, htmlInline
, htmlBlock
, htmlText
Expand All @@ -13,6 +15,8 @@ module Commonmark.Html
, renderHtml
, escapeURI
, escapeHtml
, transform
, transformM
)
where

Expand Down Expand Up @@ -463,3 +467,15 @@ escapeURIChar c
'#','!','$','\'','(',')','*','+',',',
';','=']

-- | Walk HTML nodes bottom-up, applying a function.
transform :: (Html a -> Html a) -> Html a -> Html a
transform f (HtmlElement et name attr (Just elt)) =
f $ HtmlElement et name attr (Just (transform f elt))
transform f elt = f elt

-- | Walk HTML nodes bottom-up, applying a function, in a monadic context.
transformM :: Monad m => (Html a -> m (Html a)) -> Html a -> m (Html a)
transformM f (HtmlElement et name attr (Just elt)) = do
elt' <- transformM f elt
f $ HtmlElement et name attr (Just elt')
transformM f elt = f elt