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Render.hs
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Render.hs
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{-# LANGUAGE LambdaCase #-}
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE RecordWildCards #-}
-- |
-- Module : Text.MMark.Render
-- Copyright : © 2017–present Mark Karpov
-- License : BSD 3 clause
--
-- Maintainer : Mark Karpov <markkarpov92@gmail.com>
-- Stability : experimental
-- Portability : portable
--
-- MMark rendering machinery.
--
-- @since 0.0.8.0
module Text.MMark.Render
( render,
applyBlockRender,
defaultBlockRender,
applyInlineRender,
defaultInlineRender,
newline,
)
where
import Control.Arrow
import Control.Monad
import Data.Char (isSpace)
import Data.Function (fix)
import Data.List.NonEmpty (NonEmpty (..))
import Data.List.NonEmpty qualified as NE
import Data.Text qualified as T
import Lucid
import Text.MMark.Internal.Type
import Text.MMark.Trans
import Text.MMark.Util
import Text.URI qualified as URI
-- | Render a 'MMark' markdown document. You can then render @'Html' ()@ to
-- various things:
--
-- * to lazy 'Data.Taxt.Lazy.Text' with 'renderText'
-- * to lazy 'Data.ByteString.Lazy.ByteString' with 'renderBS'
-- * directly to file with 'renderToFile'
render :: MMark -> Html ()
render MMark {..} =
mapM_ rBlock mmarkBlocks
where
Extension {..} = mmarkExtension
rBlock =
applyBlockRender extBlockRender
. fmap rInlines
. applyBlockTrans extBlockTrans
rInlines =
(mkOisInternal &&& mapM_ (applyInlineRender extInlineRender))
. fmap (applyInlineTrans extInlineTrans)
-- | Apply a 'Render' to a given @'Block' 'Html' ()@.
--
-- @since 0.0.8.0
applyBlockRender ::
Render (Block (Ois, Html ())) ->
Block (Ois, Html ()) ->
Html ()
applyBlockRender r = fix (runRender r . defaultBlockRender)
-- | The default 'Block' render.
--
-- @since 0.0.8.0
defaultBlockRender ::
-- | Rendering function to use to render sub-blocks
(Block (Ois, Html ()) -> Html ()) ->
Block (Ois, Html ()) ->
Html ()
defaultBlockRender blockRender = \case
ThematicBreak ->
hr_ [] >> newline
Heading1 (h, html) ->
h1_ (mkId h) html >> newline
Heading2 (h, html) ->
h2_ (mkId h) html >> newline
Heading3 (h, html) ->
h3_ (mkId h) html >> newline
Heading4 (h, html) ->
h4_ (mkId h) html >> newline
Heading5 (h, html) ->
h5_ (mkId h) html >> newline
Heading6 (h, html) ->
h6_ (mkId h) html >> newline
CodeBlock infoString txt -> do
let f x = class_ $ "language-" <> T.takeWhile (not . isSpace) x
pre_ $ code_ (maybe [] (pure . f) infoString) (toHtml txt)
newline
Naked (_, html) ->
html >> newline
Paragraph (_, html) ->
p_ html >> newline
Blockquote blocks -> do
blockquote_ (newline <* mapM_ blockRender blocks)
newline
OrderedList i items -> do
let startIndex = [start_ (T.pack $ show i) | i /= 1]
ol_ startIndex $ do
newline
forM_ items $ \x -> do
li_ (newline <* mapM_ blockRender x)
newline
newline
UnorderedList items -> do
ul_ $ do
newline
forM_ items $ \x -> do
li_ (newline <* mapM_ blockRender x)
newline
newline
Table calign (hs :| rows) -> do
table_ $ do
newline
thead_ $ do
newline
tr_ $
forM_ (NE.zip calign hs) $ \(a, h) ->
th_ (alignStyle a) (snd h)
newline
newline
tbody_ $ do
newline
forM_ rows $ \row -> do
tr_ $
forM_ (NE.zip calign row) $ \(a, h) ->
td_ (alignStyle a) (snd h)
newline
newline
newline
where
mkId ois = [(id_ . headerId . getOis) ois]
alignStyle = \case
CellAlignDefault -> []
CellAlignLeft -> [style_ "text-align:left"]
CellAlignRight -> [style_ "text-align:right"]
CellAlignCenter -> [style_ "text-align:center"]
-- | Apply a render to a given 'Inline'.
--
-- @since 0.0.8.0
applyInlineRender :: Render Inline -> Inline -> Html ()
applyInlineRender r = fix (runRender r . defaultInlineRender)
-- | The default render for 'Inline' elements.
--
-- @since 0.0.8.0
defaultInlineRender ::
-- | Rendering function to use to render sub-inlines
(Inline -> Html ()) ->
Inline ->
Html ()
defaultInlineRender inlineRender = \case
Plain txt ->
toHtml txt
LineBreak ->
br_ [] >> newline
Emphasis inner ->
em_ (mapM_ inlineRender inner)
Strong inner ->
strong_ (mapM_ inlineRender inner)
Strikeout inner ->
del_ (mapM_ inlineRender inner)
Subscript inner ->
sub_ (mapM_ inlineRender inner)
Superscript inner ->
sup_ (mapM_ inlineRender inner)
CodeSpan txt ->
code_ (toHtml txt)
Link inner dest mtitle ->
let title = maybe [] (pure . title_) mtitle
in a_ (href_ (URI.render dest) : title) (mapM_ inlineRender inner)
Image desc src mtitle ->
let title = maybe [] (pure . title_) mtitle
in img_ (alt_ (asPlainText desc) : src_ (URI.render src) : title)
-- | HTML containing a newline.
--
-- @since 0.0.8.0
newline :: Html ()
newline = "\n"