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-- Copyright 2019 Google LLC
--
-- Use of this source code is governed by a BSD-style
-- license that can be found in the LICENSE file or at
-- https://developers.google.com/open-source/licenses/bsd
{-# OPTIONS_GHC -Wno-orphans #-}
{-# OPTIONS_GHC -Wno-incomplete-patterns #-}
module RenderHtml (
progHtml, ToMarkup, renderSourceBlock, renderOutputs,
RenderedSourceBlock, RenderedOutputs) where
import Text.Blaze.Internal (MarkupM)
import Text.Blaze.Html5 as H hiding (map, b)
import Text.Blaze.Html5.Attributes as At
import Text.Blaze.Html.Renderer.String
import Data.Aeson (ToJSON)
import qualified Data.Map.Strict as M
import Control.Monad.State.Strict
import Control.Monad.Writer.Strict
import Data.Functor ((<&>))
import Data.Maybe (fromJust)
import Data.String (fromString)
import Data.Text qualified as T
import Data.Text.IO qualified as T
import CMark (commonmarkToHtml)
import System.IO.Unsafe
import GHC.Generics
import Err
import Paths_dex (getDataFileName)
import PPrint ()
import Types.Source
import Util (unsnoc, foldJusts)
-- === rendering results ===
-- RenderedOutputs, RenderedSourceBlock aren't 100% HTML themselves but the idea
-- is that they should be trivially convertable to JSON and sent over to the
-- client which can do the final rendering without much code or runtime work.
type BlockId = Int
data RenderedSourceBlock = RenderedSourceBlock
{ rsbLine :: Int
, rsbBlockId :: BlockId
, rsbLexemeList :: [SrcId]
, rsbHtml :: String }
deriving (Generic)
data RenderedOutputs = RenderedOutputs
{ rrHtml :: String
, rrHighlightMap :: HighlightMap
, rrHoverInfoMap :: HoverInfoMap }
deriving (Generic)
renderOutputs :: Outputs -> RenderedOutputs
renderOutputs r = RenderedOutputs
{ rrHtml = pprintHtml r
, rrHighlightMap = computeHighlights r
, rrHoverInfoMap = computeHoverInfo r }
renderSourceBlock :: BlockId -> SourceBlock -> RenderedSourceBlock
renderSourceBlock n b = RenderedSourceBlock
{ rsbLine = sbLine b
, rsbBlockId = n
, rsbLexemeList = unsnoc $ lexemeList $ sbLexemeInfo b
, rsbHtml = renderHtml case sbContents b of
Misc (ProseBlock s) -> cdiv "prose-block" $ mdToHtml s
_ -> renderSpans n (sbLexemeInfo b) (sbText b)
}
instance ToMarkup Outputs where
toMarkup (Outputs outs) = foldMap toMarkup outs
instance ToMarkup Output where
toMarkup out = case out of
HtmlOut s -> preEscapedString s
SourceInfo _ -> mempty
Error _ -> cdiv "err-block" $ toHtml $ pprint out
_ -> cdiv "result-block" $ toHtml $ pprint out
instance ToJSON RenderedOutputs
instance ToJSON RenderedSourceBlock
-- === textual information on hover ===
type HoverInfo = String
newtype HoverInfoMap = HoverInfoMap (M.Map LexemeId HoverInfo) deriving (ToJSON, Semigroup, Monoid)
computeHoverInfo :: Outputs -> HoverInfoMap
computeHoverInfo (Outputs outputs) = do
let typeInfo = foldJusts outputs \case
SourceInfo (SITypeInfo m) -> Just m
_ -> Nothing
HoverInfoMap $ fromTypeInfo typeInfo
-- === highlighting on hover ===
newtype FocusMap = FocusMap (M.Map LexemeId SrcId) deriving (ToJSON, Semigroup, Monoid)
newtype HighlightMap = HighlightMap (M.Map SrcId Highlights) deriving (ToJSON, Semigroup, Monoid)
type Highlights = [(HighlightType, LexemeSpan)]
data HighlightType = HighlightGroup | HighlightLeaf deriving Generic
instance ToJSON HighlightType
computeHighlights :: Outputs -> HighlightMap
computeHighlights (Outputs outputs) = do
execWriter $ mapM go $ foldJusts outputs \case
SourceInfo (SIGroupTree t) -> Just t
_ -> Nothing
where
go :: GroupTree -> Writer HighlightMap ()
go t = do
let children = gtChildren t
let highlights = children <&> \child ->
(getHighlightType (gtIsAtomicLexeme child), gtSpan child)
forM_ children \child-> do
tell $ HighlightMap $ M.singleton (gtSrcId child) highlights
go child
getHighlightType :: Bool -> HighlightType
getHighlightType True = HighlightLeaf
getHighlightType False = HighlightGroup
-- -----------------
cssSource :: T.Text
cssSource = unsafePerformIO $
T.readFile =<< getDataFileName "static/style.css"
{-# NOINLINE cssSource #-}
javascriptSource :: T.Text
javascriptSource = unsafePerformIO $
T.readFile =<< getDataFileName "static/index.js"
{-# NOINLINE javascriptSource #-}
pprintHtml :: ToMarkup a => a -> String
pprintHtml x = renderHtml $ toMarkup x
progHtml :: (ToMarkup a, ToMarkup b) => [(a, b)] -> String
progHtml blocks = renderHtml $ wrapBody $ map toHtmlBlock blocks
where toHtmlBlock (block,outputs) = toMarkup block <> toMarkup outputs
wrapBody :: [Html] -> Html
wrapBody blocks = docTypeHtml $ do
H.head $ do
H.meta ! charset "UTF-8"
-- Base CSS stylesheet.
H.style ! type_ "text/css" $ toHtml cssSource
-- KaTeX CSS and JavaScript.
H.link ! rel "stylesheet" ! href "https://cdn.jsdelivr.net/npm/katex@0.12.0/dist/katex.min.css"
H.script ! defer "" ! src "https://cdn.jsdelivr.net/npm/katex@0.12.0/dist/katex.min.js" $ mempty
H.script ! defer "" ! src "https://cdn.jsdelivr.net/npm/katex@0.12.0/dist/contrib/auto-render.min.js"
! onload jsSource $ mempty
H.body $ H.div inner ! At.id "main-output"
where
inner = foldMap (cdiv "cell") blocks
jsSource = textValue $ javascriptSource <> "render(RENDER_MODE.STATIC);"
mdToHtml :: T.Text -> Html
mdToHtml s = preEscapedText $ commonmarkToHtml [] s
cdiv :: String -> Html -> Html
cdiv c inner = H.div inner ! class_ (stringValue c)
renderSpans :: BlockId -> LexemeInfo -> T.Text -> Markup
renderSpans blockId lexInfo sourceText = cdiv "code-block" do
runTextWalkerT sourceText do
forM_ (lexemeList lexInfo) \sourceId -> do
let (lexemeTy, (l, r)) = fromJust $ M.lookup sourceId (lexemeInfo lexInfo)
takeTo l >>= emitSpan Nothing (Just "comment")
takeTo r >>= emitSpan (Just (blockId, sourceId)) (lexemeClass lexemeTy)
takeRest >>= emitSpan Nothing (Just "comment")
emitSpan :: Maybe (BlockId, SrcId) -> Maybe String -> T.Text -> TextWalker ()
emitSpan maybeSrcId className t = lift do
let classAttr = case className of
Nothing -> mempty
Just c -> class_ (stringValue c)
let idAttr = case maybeSrcId of
Nothing -> mempty
Just (bid, SrcId sid) -> At.id (fromString $ "span_" ++ show bid ++ "_"++ show sid)
H.span (toHtml t) ! classAttr ! idAttr
lexemeClass :: LexemeType -> Maybe String
lexemeClass = \case
Keyword -> Just "keyword"
Symbol -> Just "symbol"
TypeName -> Just "type-name"
LowerName -> Nothing
UpperName -> Nothing
LiteralLexeme -> Just "literal"
StringLiteralLexeme -> Nothing
MiscLexeme -> Nothing
type TextWalker a = StateT (Int, T.Text) MarkupM a
runTextWalkerT :: T.Text -> TextWalker a -> MarkupM a
runTextWalkerT t cont = evalStateT cont (0, t)
-- index is the *absolute* index, from the very beginning
takeTo :: Int -> TextWalker T.Text
takeTo startPos = do
(curPos, curText) <- get
let (prefix, remText) = T.splitAt (startPos- curPos) curText
put (startPos, remText)
return prefix
takeRest :: TextWalker T.Text
takeRest = do
(curPos, curText) <- get
put (curPos + T.length curText, mempty)
return curText
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