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|
{-# LANGUAGE NoImplicitPrelude #-}
{-# LANGUAGE LambdaCase #-}
{-# LANGUAGE FlexibleContexts #-}
{-# LANGUAGE FlexibleInstances #-}
{-# LANGUAGE MultiParamTypeClasses #-}
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE ViewPatterns #-}
{- |
Module : Text.Pandoc.Readers.HTML
Copyright : Copyright (C) 2006-2019 John MacFarlane
License : GNU GPL, version 2 or above
Maintainer : John MacFarlane <jgm@berkeley.edu>
Stability : alpha
Portability : portable
Conversion of HTML to 'Pandoc' document.
-}
module Text.Pandoc.Readers.HTML ( readHtml
, htmlTag
, htmlInBalanced
, isInlineTag
, isBlockTag
, NamedTag(..)
, isTextTag
, isCommentTag
) where
import Prelude
import Control.Applicative ((<|>))
import Control.Arrow (first)
import Control.Monad (guard, mplus, msum, mzero, unless, void)
import Control.Monad.Except (throwError)
import Control.Monad.Reader (ReaderT, ask, asks, lift, local, runReaderT)
import Data.Char (isAlphaNum, isLetter)
import Data.Default (Default (..), def)
import Data.Foldable (for_)
import Data.List.Split (splitWhen)
import qualified Data.Map as M
import Data.Maybe (fromMaybe, isJust, isNothing)
import Data.Monoid (First (..))
import qualified Data.Set as Set
import Data.Text (Text)
import qualified Data.Text as T
import Network.URI (URI, nonStrictRelativeTo, parseURIReference)
import Text.HTML.TagSoup
import Text.HTML.TagSoup.Match
import Text.Pandoc.Builder (Blocks, HasMeta (..), Inlines, trimInlines)
import qualified Text.Pandoc.Builder as B
import Text.Pandoc.Class (PandocMonad (..))
import Text.Pandoc.CSS (foldOrElse, pickStyleAttrProps)
import Text.Pandoc.Definition
import Text.Pandoc.Readers.LaTeX (rawLaTeXInline)
import Text.Pandoc.Readers.LaTeX.Types (Macro)
import Text.Pandoc.Error
import Text.Pandoc.Logging
import Text.Pandoc.Options (
Extension (Ext_epub_html_exts, Ext_empty_paragraphs, Ext_native_divs,
Ext_native_spans, Ext_raw_html, Ext_line_blocks, Ext_raw_tex),
ReaderOptions (readerExtensions, readerStripComments),
extensionEnabled)
import Text.Pandoc.Parsing hiding ((<|>))
import Text.Pandoc.Shared (addMetaField, blocksToInlines', crFilter, escapeURI,
extractSpaces, htmlSpanLikeElements, elemText, splitTextBy,
onlySimpleTableCells, safeRead, underlineSpan, tshow)
import Text.Pandoc.Walk
import Text.Parsec.Error
import Text.TeXMath (readMathML, writeTeX)
-- | Convert HTML-formatted string to 'Pandoc' document.
readHtml :: PandocMonad m
=> ReaderOptions -- ^ Reader options
-> Text -- ^ String to parse (assumes @'\n'@ line endings)
-> m Pandoc
readHtml opts inp = do
let tags = stripPrefixes . canonicalizeTags $
parseTagsOptions parseOptions{ optTagPosition = True }
(crFilter inp)
parseDoc = do
blocks <- fixPlains False . mconcat <$> manyTill block eof
meta <- stateMeta . parserState <$> getState
bs' <- replaceNotes (B.toList blocks)
reportLogMessages
return $ Pandoc meta bs'
getError (errorMessages -> ms) = case ms of
[] -> ""
(m:_) -> messageString m
result <- flip runReaderT def $
runParserT parseDoc
(HTMLState def{ stateOptions = opts }
[] Nothing Set.empty [] M.empty)
"source" tags
case result of
Right doc -> return doc
Left err -> throwError $ PandocParseError $ T.pack $ getError err
replaceNotes :: PandocMonad m => [Block] -> TagParser m [Block]
replaceNotes bs = do
st <- getState
return $ walk (replaceNotes' (noteTable st)) bs
replaceNotes' :: [(Text, Blocks)] -> Inline -> Inline
replaceNotes' noteTbl (RawInline (Format "noteref") ref) =
maybe (Str "") (Note . B.toList) $ lookup ref noteTbl
replaceNotes' _ x = x
data HTMLState =
HTMLState
{ parserState :: ParserState,
noteTable :: [(Text, Blocks)],
baseHref :: Maybe URI,
identifiers :: Set.Set Text,
logMessages :: [LogMessage],
macros :: M.Map Text Macro
}
data HTMLLocal = HTMLLocal { quoteContext :: QuoteContext
, inChapter :: Bool -- ^ Set if in chapter section
, inPlain :: Bool -- ^ Set if in pPlain
}
setInChapter :: PandocMonad m => HTMLParser m s a -> HTMLParser m s a
setInChapter = local (\s -> s {inChapter = True})
setInPlain :: PandocMonad m => HTMLParser m s a -> HTMLParser m s a
setInPlain = local (\s -> s {inPlain = True})
type HTMLParser m s = ParserT s HTMLState (ReaderT HTMLLocal m)
type TagParser m = HTMLParser m [Tag Text]
pHtml :: PandocMonad m => TagParser m Blocks
pHtml = try $ do
(TagOpen "html" attr) <- lookAhead pAny
for_ (lookup "lang" attr) $
updateState . B.setMeta "lang" . B.text
pInTags "html" block
pBody :: PandocMonad m => TagParser m Blocks
pBody = pInTags "body" block
pHead :: PandocMonad m => TagParser m Blocks
pHead = pInTags "head" $ pTitle <|> pMetaTag <|> pBaseTag <|> (mempty <$ pAny)
where pTitle = pInTags "title" inline >>= setTitle . trimInlines
setTitle t = mempty <$ updateState (B.setMeta "title" t)
pMetaTag = do
mt <- pSatisfy (matchTagOpen "meta" [])
let name = fromAttrib "name" mt
if T.null name
then return mempty
else do
let content = fromAttrib "content" mt
updateState $ \s ->
let ps = parserState s in
s{ parserState = ps{
stateMeta = addMetaField name (B.text content)
(stateMeta ps) } }
return mempty
pBaseTag = do
bt <- pSatisfy (matchTagOpen "base" [])
updateState $ \st -> st{ baseHref =
parseURIReference $ T.unpack $ fromAttrib "href" bt }
return mempty
block :: PandocMonad m => TagParser m Blocks
block = do
res <- choice
[ eSection
, eSwitch B.para block
, mempty <$ eFootnote
, mempty <$ eTOC
, mempty <$ eTitlePage
, pPara
, pHeader
, pBlockQuote
, pCodeBlock
, pList
, pHrule
, pTable
, pHtml
, pHead
, pBody
, pLineBlock
, pDiv
, pPlain
, pFigure
, pRawHtmlBlock
]
trace (T.take 60 $ tshow $ B.toList res)
return res
namespaces :: PandocMonad m => [(Text, TagParser m Inlines)]
namespaces = [(mathMLNamespace, pMath True)]
mathMLNamespace :: Text
mathMLNamespace = "http://www.w3.org/1998/Math/MathML"
eSwitch :: (PandocMonad m, Monoid a)
=> (Inlines -> a)
-> TagParser m a
-> TagParser m a
eSwitch constructor parser = try $ do
guardEnabled Ext_epub_html_exts
pSatisfy (matchTagOpen "switch" [])
cases <- getFirst . mconcat <$>
manyTill (First <$> (eCase <* skipMany pBlank) )
(lookAhead $ try $ pSatisfy (matchTagOpen "default" []))
skipMany pBlank
fallback <- pInTags "default" (skipMany pBlank *> parser <* skipMany pBlank)
skipMany pBlank
pSatisfy (matchTagClose "switch")
return $ maybe fallback constructor cases
eCase :: PandocMonad m => TagParser m (Maybe Inlines)
eCase = do
skipMany pBlank
TagOpen _ attr' <- lookAhead $ pSatisfy (matchTagOpen "case" [])
let attr = toStringAttr attr'
case flip lookup namespaces =<< lookup "required-namespace" attr of
Just p -> Just <$> pInTags "case" (skipMany pBlank *> p <* skipMany pBlank)
Nothing -> Nothing <$ manyTill pAny (pSatisfy (matchTagClose "case"))
eFootnote :: PandocMonad m => TagParser m ()
eFootnote = try $ do
let notes = ["footnote", "rearnote"]
guardEnabled Ext_epub_html_exts
(TagOpen tag attr') <- lookAhead pAny
let attr = toStringAttr attr'
guard $ maybe False (`elem` notes)
(lookup "type" attr <|> lookup "epub:type" attr)
let ident = fromMaybe "" (lookup "id" attr)
content <- pInTags tag block
addNote ident content
addNote :: PandocMonad m => Text -> Blocks -> TagParser m ()
addNote uid cont = updateState (\s -> s {noteTable = (uid, cont) : noteTable s})
eNoteref :: PandocMonad m => TagParser m Inlines
eNoteref = try $ do
guardEnabled Ext_epub_html_exts
TagOpen tag attr <-
pSatisfy (\case
TagOpen _ as
-> (lookup "type" as <|> lookup "epub:type" as)
== Just "noteref"
_ -> False)
ident <- case lookup "href" attr >>= T.uncons of
Just ('#', rest) -> return rest
_ -> mzero
_ <- manyTill pAny (pSatisfy (\case
TagClose t -> t == tag
_ -> False))
return $ B.rawInline "noteref" ident
-- Strip TOC if there is one, better to generate again
eTOC :: PandocMonad m => TagParser m ()
eTOC = try $ do
guardEnabled Ext_epub_html_exts
(TagOpen tag attr) <- lookAhead pAny
guard $ (lookup "type" attr <|> lookup "epub:type" attr) == Just "toc"
void (pInTags tag block)
pList :: PandocMonad m => TagParser m Blocks
pList = pBulletList <|> pOrderedList <|> pDefinitionList
pBulletList :: PandocMonad m => TagParser m Blocks
pBulletList = try $ do
pSatisfy (matchTagOpen "ul" [])
let nonItem = pSatisfy (\t ->
not (tagOpen (`elem` ["li","ol","ul","dl"]) (const True) t) &&
not (matchTagClose "ul" t))
-- note: if they have an <ol> or <ul> not in scope of a <li>,
-- treat it as a list item, though it's not valid xhtml...
skipMany nonItem
items <- manyTill (pListItem nonItem) (pCloses "ul")
return $ B.bulletList $ map (fixPlains True) items
pListItem :: PandocMonad m => TagParser m a -> TagParser m Blocks
pListItem nonItem = do
TagOpen _ attr' <- lookAhead $ pSatisfy (matchTagOpen "li" [])
let attr = toStringAttr attr'
let addId ident bs = case B.toList bs of
(Plain ils:xs) -> B.fromList (Plain
[Span (ident, [], []) ils] : xs)
_ -> B.divWith (ident, [], []) bs
maybe id addId (lookup "id" attr) <$>
pInTags "li" block <* skipMany nonItem
parseListStyleType :: Text -> ListNumberStyle
parseListStyleType "lower-roman" = LowerRoman
parseListStyleType "upper-roman" = UpperRoman
parseListStyleType "lower-alpha" = LowerAlpha
parseListStyleType "upper-alpha" = UpperAlpha
parseListStyleType "decimal" = Decimal
parseListStyleType _ = DefaultStyle
parseTypeAttr :: Text -> ListNumberStyle
parseTypeAttr "i" = LowerRoman
parseTypeAttr "I" = UpperRoman
parseTypeAttr "a" = LowerAlpha
parseTypeAttr "A" = UpperAlpha
parseTypeAttr "1" = Decimal
parseTypeAttr _ = DefaultStyle
pOrderedList :: PandocMonad m => TagParser m Blocks
pOrderedList = try $ do
TagOpen _ attribs' <- pSatisfy (matchTagOpen "ol" [])
let attribs = toStringAttr attribs'
let (start, style) = (sta', sty')
where sta = fromMaybe "1" $
lookup "start" attribs
sta' = fromMaybe 1 $ safeRead sta
pickListStyle = pickStyleAttrProps ["list-style-type", "list-style"]
typeAttr = fromMaybe "" $ lookup "type" attribs
classAttr = fromMaybe "" $ lookup "class" attribs
styleAttr = fromMaybe "" $ lookup "style" attribs
listStyle = fromMaybe "" $ pickListStyle styleAttr
sty' = foldOrElse DefaultStyle
[ parseTypeAttr typeAttr
, parseListStyleType classAttr
, parseListStyleType listStyle
]
let nonItem = pSatisfy (\t ->
not (tagOpen (`elem` ["li","ol","ul","dl"]) (const True) t) &&
not (matchTagClose "ol" t))
-- note: if they have an <ol> or <ul> not in scope of a <li>,
-- treat it as a list item, though it's not valid xhtml...
skipMany nonItem
items <- manyTill (pListItem nonItem) (pCloses "ol")
return $ B.orderedListWith (start, style, DefaultDelim) $ map (fixPlains True) items
pDefinitionList :: PandocMonad m => TagParser m Blocks
pDefinitionList = try $ do
pSatisfy (matchTagOpen "dl" [])
items <- manyTill pDefListItem (pCloses "dl")
return $ B.definitionList items
pDefListItem :: PandocMonad m => TagParser m (Inlines, [Blocks])
pDefListItem = try $ do
let nonItem = pSatisfy (\t -> not (matchTagOpen "dt" [] t) &&
not (matchTagOpen "dd" [] t) && not (matchTagClose "dl" t))
terms <- many1 (try $ skipMany nonItem >> pInTags "dt" inline)
defs <- many1 (try $ skipMany nonItem >> pInTags "dd" block)
skipMany nonItem
let term = foldl1 (\x y -> x <> B.linebreak <> y) $ map trimInlines terms
return (term, map (fixPlains True) defs)
fixPlains :: Bool -> Blocks -> Blocks
fixPlains inList bs = if any isParaish bs'
then B.fromList $ map plainToPara bs'
else bs
where isParaish Para{} = True
isParaish CodeBlock{} = True
isParaish Header{} = True
isParaish BlockQuote{} = True
isParaish BulletList{} = not inList
isParaish OrderedList{} = not inList
isParaish DefinitionList{} = not inList
isParaish _ = False
plainToPara (Plain xs) = Para xs
plainToPara x = x
bs' = B.toList bs
pRawTag :: PandocMonad m => TagParser m Text
pRawTag = do
tag <- pAny
let ignorable x = x `elem` ["html","head","body","!DOCTYPE","?xml"]
if tagOpen ignorable (const True) tag || tagClose ignorable tag
then return mempty
else return $ renderTags' [tag]
pLineBlock :: PandocMonad m => TagParser m Blocks
pLineBlock = try $ do
guardEnabled Ext_line_blocks
_ <- pSatisfy $ tagOpen (=="div") (== [("class","line-block")])
ils <- trimInlines . mconcat <$> manyTill inline (pSatisfy (tagClose (=="div")))
let lns = map B.fromList $
splitWhen (== LineBreak) $ filter (/= SoftBreak) $
B.toList ils
return $ B.lineBlock lns
pDiv :: PandocMonad m => TagParser m Blocks
pDiv = try $ do
guardEnabled Ext_native_divs
let isDivLike "div" = True
isDivLike "section" = True
isDivLike "main" = True
isDivLike _ = False
TagOpen tag attr' <- lookAhead $ pSatisfy $ tagOpen isDivLike (const True)
let attr = toStringAttr attr'
contents <- pInTags tag block
let (ident, classes, kvs) = mkAttr attr
let classes' = if tag == "section"
then "section":classes
else classes
kvs' = if tag == "main" && isNothing (lookup "role" kvs)
then ("role", "main"):kvs
else kvs
return $ B.divWith (ident, classes', kvs') contents
pRawHtmlBlock :: PandocMonad m => TagParser m Blocks
pRawHtmlBlock = do
raw <- (pHtmlBlock "script" <|> pHtmlBlock "style" <|> pHtmlBlock "textarea"
<|> pRawTag)
exts <- getOption readerExtensions
if extensionEnabled Ext_raw_html exts && not (T.null raw)
then return $ B.rawBlock "html" raw
else ignore raw
ignore :: (Monoid a, PandocMonad m) => Text -> TagParser m a
ignore raw = do
pos <- getPosition
-- raw can be null for tags like <!DOCTYPE>; see paRawTag
-- in this case we don't want a warning:
unless (T.null raw) $
logMessage $ SkippedContent raw pos
return mempty
pHtmlBlock :: PandocMonad m => Text -> TagParser m Text
pHtmlBlock t = try $ do
open <- pSatisfy (matchTagOpen t [])
contents <- manyTill pAny (pSatisfy (matchTagClose t))
return $ renderTags' $ [open] <> contents <> [TagClose t]
-- Sets chapter context
eSection :: PandocMonad m => TagParser m Blocks
eSection = try $ do
let matchChapter as = maybe False (T.isInfixOf "chapter")
(lookup "type" as <|> lookup "epub:type" as)
let sectTag = tagOpen (`elem` sectioningContent) matchChapter
TagOpen tag _ <- lookAhead $ pSatisfy sectTag
setInChapter (pInTags tag block)
headerLevel :: Text -> TagParser m Int
headerLevel tagtype =
case safeRead (T.drop 1 tagtype) of
Just level ->
-- try (do
-- guardEnabled Ext_epub_html_exts
-- asks inChapter >>= guard
-- return (level - 1))
-- <|>
return level
Nothing -> Prelude.fail "Could not retrieve header level"
eTitlePage :: PandocMonad m => TagParser m ()
eTitlePage = try $ do
let isTitlePage as = maybe False (T.isInfixOf "titlepage")
(lookup "type" as <|> lookup "epub:type" as)
let groupTag = tagOpen (\x -> x `elem` groupingContent || x == "section")
isTitlePage
TagOpen tag _ <- lookAhead $ pSatisfy groupTag
() <$ pInTags tag block
pHeader :: PandocMonad m => TagParser m Blocks
pHeader = try $ do
TagOpen tagtype attr' <- pSatisfy $
tagOpen (`elem` ["h1","h2","h3","h4","h5","h6"])
(const True)
let attr = toStringAttr attr'
let bodyTitle = TagOpen tagtype attr' ~== TagOpen ("h1" :: Text)
[("class","title")]
level <- headerLevel tagtype
contents <- trimInlines . mconcat <$> manyTill inline (pCloses tagtype <|> eof)
let ident = fromMaybe "" $ lookup "id" attr
let classes = maybe [] T.words $ lookup "class" attr
let keyvals = [(k,v) | (k,v) <- attr, k /= "class", k /= "id"]
attr'' <- registerHeader (ident, classes, keyvals) contents
return $ if bodyTitle
then mempty -- skip a representation of the title in the body
else B.headerWith attr'' level contents
pHrule :: PandocMonad m => TagParser m Blocks
pHrule = do
pSelfClosing (=="hr") (const True)
return B.horizontalRule
pTable :: PandocMonad m => TagParser m Blocks
pTable = try $ do
TagOpen _ _ <- pSatisfy (matchTagOpen "table" [])
skipMany pBlank
caption <- option mempty $ pInTags "caption" inline <* skipMany pBlank
widths' <- (mconcat <$> many1 pColgroup) <|> many pCol
let pTh = option [] $ pInTags "tr" (pCell "th")
pTr = try $ skipMany pBlank >>
pInTags "tr" (pCell "td" <|> pCell "th")
pTBody = pInTag True "tbody" $ many1 pTr
head'' <- pInTag False "thead" (option [] pTr) <|> pInTag True "thead" pTh
head' <- map snd <$>
pInTag True "tbody"
(if null head'' then pTh else return head'')
topfoot <- option [] $ pInTag False "tfoot" $ many pTr
rowsLs <- many pTBody
bottomfoot <- option [] $ pInTag False "tfoot" $ many pTr
TagClose _ <- pSatisfy (matchTagClose "table")
let rows'' = concat rowsLs <> topfoot <> bottomfoot
let rows''' = map (map snd) rows''
-- fail on empty table
guard $ not $ null head' && null rows'''
let isSimple = onlySimpleTableCells $ fmap B.toList <$> head':rows'''
let cols = if null head'
then maximum (map length rows''')
else length head'
-- add empty cells to short rows
let addEmpties r = case cols - length r of
n | n > 0 -> r <> replicate n mempty
| otherwise -> r
let rows = map addEmpties rows'''
let aligns = case rows'' of
(cs:_) -> take cols $ map fst cs ++ repeat AlignDefault
_ -> replicate cols AlignDefault
let widths = if null widths'
then if isSimple
then replicate cols 0
else replicate cols (1.0 / fromIntegral cols)
else widths'
return $ B.table caption (zip aligns widths) head' rows
pCol :: PandocMonad m => TagParser m Double
pCol = try $ do
TagOpen _ attribs' <- pSatisfy (matchTagOpen "col" [])
let attribs = toStringAttr attribs'
skipMany pBlank
optional $ pSatisfy (matchTagClose "col")
skipMany pBlank
let width = case lookup "width" attribs of
Nothing -> case lookup "style" attribs of
Just (T.stripPrefix "width:" -> Just xs) | T.any (== '%') xs ->
fromMaybe 0.0 $ safeRead (T.filter
(`notElem` (" \t\r\n%'\";" :: [Char])) xs)
_ -> 0.0
Just (T.unsnoc -> Just (xs, '%')) ->
fromMaybe 0.0 $ safeRead xs
_ -> 0.0
if width > 0.0
then return $ width / 100.0
else return 0.0
pColgroup :: PandocMonad m => TagParser m [Double]
pColgroup = try $ do
pSatisfy (matchTagOpen "colgroup" [])
skipMany pBlank
manyTill pCol (pCloses "colgroup" <|> eof) <* skipMany pBlank
noColOrRowSpans :: Tag Text -> Bool
noColOrRowSpans t = isNullOrOne "colspan" && isNullOrOne "rowspan"
where isNullOrOne x = case fromAttrib x t of
"" -> True
"1" -> True
_ -> False
pCell :: PandocMonad m => Text -> TagParser m [(Alignment, Blocks)]
pCell celltype = try $ do
skipMany pBlank
tag <- lookAhead $
pSatisfy (\t -> t ~== TagOpen celltype [] && noColOrRowSpans t)
let extractAlign' [] = ""
extractAlign' ("text-align":x:_) = x
extractAlign' (_:xs) = extractAlign' xs
let extractAlign = extractAlign' . splitTextBy (`elemText` " \t;:")
let align = case maybeFromAttrib "align" tag `mplus`
(extractAlign <$> maybeFromAttrib "style" tag) of
Just "left" -> AlignLeft
Just "right" -> AlignRight
Just "center" -> AlignCenter
_ -> AlignDefault
res <- pInTags' celltype noColOrRowSpans block
skipMany pBlank
return [(align, res)]
pBlockQuote :: PandocMonad m => TagParser m Blocks
pBlockQuote = do
contents <- pInTags "blockquote" block
return $ B.blockQuote $ fixPlains False contents
pPlain :: PandocMonad m => TagParser m Blocks
pPlain = do
contents <- setInPlain $ trimInlines . mconcat <$> many1 inline
if B.isNull contents
then return mempty
else return $ B.plain contents
pPara :: PandocMonad m => TagParser m Blocks
pPara = do
contents <- trimInlines <$> pInTags "p" inline
(do guardDisabled Ext_empty_paragraphs
guard (B.isNull contents)
return mempty)
<|> return (B.para contents)
pFigure :: PandocMonad m => TagParser m Blocks
pFigure = try $ do
TagOpen _ _ <- pSatisfy (matchTagOpen "figure" [])
skipMany pBlank
let pImg = (\x -> (Just x, Nothing)) <$>
(pInTag True "p" pImage <* skipMany pBlank)
pCapt = (\x -> (Nothing, Just x)) <$> do
bs <- pInTags "figcaption" block
return $ blocksToInlines' $ B.toList bs
pSkip = (Nothing, Nothing) <$ pSatisfy (not . matchTagClose "figure")
res <- many (pImg <|> pCapt <|> pSkip)
let mbimg = msum $ map fst res
let mbcap = msum $ map snd res
TagClose _ <- pSatisfy (matchTagClose "figure")
let caption = fromMaybe mempty mbcap
case B.toList <$> mbimg of
Just [Image attr _ (url, tit)] ->
return $ B.para $ B.imageWith attr url ("fig:" <> tit) caption
_ -> mzero
pCodeBlock :: PandocMonad m => TagParser m Blocks
pCodeBlock = try $ do
TagOpen _ attr' <- pSatisfy (matchTagOpen "pre" [])
let attr = toStringAttr attr'
contents <- manyTill pAny (pCloses "pre" <|> eof)
let rawText = T.concat $ map tagToText contents
-- drop leading newline if any
let result' = case T.uncons rawText of
Just ('\n', xs) -> xs
_ -> rawText
-- drop trailing newline if any
let result = case T.unsnoc result' of
Just (result'', '\n') -> result''
_ -> result'
return $ B.codeBlockWith (mkAttr attr) result
tagToText :: Tag Text -> Text
tagToText (TagText s) = s
tagToText (TagOpen "br" _) = "\n"
tagToText _ = ""
inline :: PandocMonad m => TagParser m Inlines
inline = choice
[ eNoteref
, eSwitch id inline
, pTagText
, pQ
, pEmph
, pStrong
, pSuperscript
, pSubscript
, pSpanLike
, pSmall
, pStrikeout
, pUnderline
, pLineBreak
, pLink
, pImage
, pCode
, pCodeWithClass [("samp","sample"),("var","variable")]
, pSpan
, pMath False
, pScriptMath
, pRawHtmlInline
]
pLocation :: PandocMonad m => TagParser m ()
pLocation = do
(TagPosition r c) <- pSat isTagPosition
setPosition $ newPos "input" r c
pSat :: PandocMonad m => (Tag Text -> Bool) -> TagParser m (Tag Text)
pSat f = do
pos <- getPosition
token tshow (const pos) (\x -> if f x then Just x else Nothing)
pSatisfy :: PandocMonad m => (Tag Text -> Bool) -> TagParser m (Tag Text)
pSatisfy f = try $ optional pLocation >> pSat f
pAny :: PandocMonad m => TagParser m (Tag Text)
pAny = pSatisfy (const True)
pSelfClosing :: PandocMonad m
=> (Text -> Bool) -> ([Attribute Text] -> Bool)
-> TagParser m (Tag Text)
pSelfClosing f g = do
open <- pSatisfy (tagOpen f g)
optional $ pSatisfy (tagClose f)
return open
pQ :: PandocMonad m => TagParser m Inlines
pQ = choice $ map try [citedQuote, normalQuote]
where citedQuote = do
tag <- pSatisfy $ tagOpenLit "q" (any ((=="cite") . fst))
url <- canonicalizeUrl $ fromAttrib "cite" tag
let uid = fromMaybe (fromAttrib "name" tag) $
maybeFromAttrib "id" tag
let cls = T.words $ fromAttrib "class" tag
makeQuote $ B.spanWith (uid, cls, [("cite", escapeURI url)])
normalQuote = do
pSatisfy $ tagOpenLit "q" (const True)
makeQuote id
makeQuote wrapper = do
ctx <- asks quoteContext
let (constructor, innerContext) = case ctx of
InDoubleQuote -> (B.singleQuoted, InSingleQuote)
_ -> (B.doubleQuoted, InDoubleQuote)
content <- withQuoteContext innerContext (mconcat <$> manyTill inline (pCloses "q"))
return $ extractSpaces (constructor . wrapper) content
pEmph :: PandocMonad m => TagParser m Inlines
pEmph = pInlinesInTags "em" B.emph <|> pInlinesInTags "i" B.emph
pStrong :: PandocMonad m => TagParser m Inlines
pStrong = pInlinesInTags "strong" B.strong <|> pInlinesInTags "b" B.strong
pSuperscript :: PandocMonad m => TagParser m Inlines
pSuperscript = pInlinesInTags "sup" B.superscript
pSubscript :: PandocMonad m => TagParser m Inlines
pSubscript = pInlinesInTags "sub" B.subscript
pSpanLike :: PandocMonad m => TagParser m Inlines
pSpanLike =
Set.foldr
(\tagName acc -> acc <|> parseTag tagName)
mzero
htmlSpanLikeElements
where
parseTag tagName = do
TagOpen _ attrs <- pSatisfy $ tagOpenLit tagName (const True)
let (ids, cs, kvs) = mkAttr . toStringAttr $ attrs
content <- mconcat <$> manyTill inline (pCloses tagName <|> eof)
return $ B.spanWith (ids, tagName : cs, kvs) content
pSmall :: PandocMonad m => TagParser m Inlines
pSmall = pInlinesInTags "small" (B.spanWith ("",["small"],[]))
pStrikeout :: PandocMonad m => TagParser m Inlines
pStrikeout =
pInlinesInTags "s" B.strikeout <|>
pInlinesInTags "strike" B.strikeout <|>
pInlinesInTags "del" B.strikeout <|>
try (do pSatisfy (matchTagOpen "span" [("class","strikeout")])
contents <- mconcat <$> manyTill inline (pCloses "span")
return $ B.strikeout contents)
pUnderline :: PandocMonad m => TagParser m Inlines
pUnderline = pInlinesInTags "u" underlineSpan <|> pInlinesInTags "ins" underlineSpan
pLineBreak :: PandocMonad m => TagParser m Inlines
pLineBreak = do
pSelfClosing (=="br") (const True)
return B.linebreak
-- Unlike fromAttrib from tagsoup, this distinguishes
-- between a missing attribute and an attribute with empty content.
maybeFromAttrib :: Text -> Tag Text -> Maybe Text
maybeFromAttrib name (TagOpen _ attrs) = lookup name attrs
maybeFromAttrib _ _ = Nothing
pLink :: PandocMonad m => TagParser m Inlines
pLink = try $ do
tag <- pSatisfy $ tagOpenLit "a" (const True)
let title = fromAttrib "title" tag
-- take id from id attribute if present, otherwise name
let uid = fromMaybe (fromAttrib "name" tag) $
maybeFromAttrib "id" tag
let cls = T.words $ fromAttrib "class" tag
lab <- mconcat <$> manyTill inline (pCloses "a")
-- check for href; if href, then a link, otherwise a span
case maybeFromAttrib "href" tag of
Nothing ->
return $ extractSpaces (B.spanWith (uid, cls, [])) lab
Just url' -> do
url <- canonicalizeUrl url'
return $ extractSpaces (B.linkWith (uid, cls, []) (escapeURI url) title) lab
pImage :: PandocMonad m => TagParser m Inlines
pImage = do
tag <- pSelfClosing (=="img") (isJust . lookup "src")
url <- canonicalizeUrl $ fromAttrib "src" tag
let title = fromAttrib "title" tag
let alt = fromAttrib "alt" tag
let uid = fromAttrib "id" tag
let cls = T.words $ fromAttrib "class" tag
let getAtt k = case fromAttrib k tag of
"" -> []
v -> [(k, v)]
let kvs = concatMap getAtt ["width", "height", "sizes", "srcset"]
return $ B.imageWith (uid, cls, kvs) (escapeURI url) title (B.text alt)
pCodeWithClass :: PandocMonad m => [(T.Text,Text)] -> TagParser m Inlines
pCodeWithClass elemToClass = try $ do
let tagTest = flip elem . fmap fst $ elemToClass
TagOpen open attr' <- pSatisfy $ tagOpen tagTest (const True)
result <- manyTill pAny (pCloses open)
let (ids,cs,kvs) = mkAttr . toStringAttr $ attr'
cs' = maybe cs (:cs) . lookup open $ elemToClass
return . B.codeWith (ids,cs',kvs) .
T.unwords . T.lines . innerText $ result
pCode :: PandocMonad m => TagParser m Inlines
pCode = try $ do
(TagOpen open attr') <- pSatisfy $ tagOpen (`elem` ["code","tt"]) (const True)
let attr = toStringAttr attr'
result <- manyTill pAny (pCloses open)
return $ B.codeWith (mkAttr attr) $ T.unwords $ T.lines $ innerText result
pSpan :: PandocMonad m => TagParser m Inlines
pSpan = try $ do
guardEnabled Ext_native_spans
TagOpen _ attr' <- lookAhead $ pSatisfy $ tagOpen (=="span") (const True)
let attr = toStringAttr attr'
contents <- pInTags "span" inline
let isSmallCaps = fontVariant == "small-caps" || "smallcaps" `elem` classes
where styleAttr = fromMaybe "" $ lookup "style" attr
fontVariant = fromMaybe "" $ pickStyleAttrProps ["font-variant"] styleAttr
classes = fromMaybe [] $
T.words <$> lookup "class" attr
let tag = if isSmallCaps then B.smallcaps else B.spanWith (mkAttr attr)
return $ tag contents
pRawHtmlInline :: PandocMonad m => TagParser m Inlines
pRawHtmlInline = do
inplain <- asks inPlain
result <- pSatisfy (tagComment (const True))
<|> if inplain
then pSatisfy (not . isBlockTag)
else pSatisfy isInlineTag
exts <- getOption readerExtensions
let raw = renderTags' [result]
if extensionEnabled Ext_raw_html exts
then return $ B.rawInline "html" raw
else ignore raw
mathMLToTeXMath :: Text -> Either Text Text
mathMLToTeXMath s = writeTeX <$> readMathML s
toStringAttr :: [(Text, Text)] -> [(Text, Text)]
toStringAttr = map go
where go (x,y) = (fromMaybe x $ T.stripPrefix "data-" x, y)
pScriptMath :: PandocMonad m => TagParser m Inlines
pScriptMath = try $ do
TagOpen _ attr' <- pSatisfy $ tagOpen (=="script") (const True)
isdisplay <- case lookup "type" attr' of
Just x | "math/tex" `T.isPrefixOf` x
-> return $ "display" `T.isSuffixOf` x
_ -> mzero
contents <- innerText <$> manyTill pAny (pSatisfy (matchTagClose "script"))
return $ (if isdisplay then B.displayMath else B.math) contents
pMath :: PandocMonad m => Bool -> TagParser m Inlines
pMath inCase = try $ do
open@(TagOpen _ attr') <- pSatisfy $ tagOpen (=="math") (const True)
-- we'll assume math tags are MathML unless specially marked
-- otherwise...
let attr = toStringAttr attr'
unless inCase $
guard (maybe True (== mathMLNamespace) (lookup "xmlns" attr))
contents <- manyTill pAny (pSatisfy (matchTagClose "math"))
case mathMLToTeXMath (renderTags $
[open] <> contents <> [TagClose "math"]) of
Left _ -> return $ B.spanWith ("",["math"],attr) $ B.text $
innerText contents
Right "" -> return mempty
Right x -> return $ case lookup "display" attr of
Just "block" -> B.displayMath x
_ -> B.math x
pInlinesInTags :: PandocMonad m => Text -> (Inlines -> Inlines)
-> TagParser m Inlines
pInlinesInTags tagtype f = extractSpaces f <$> pInTags tagtype inline
pInTags :: (PandocMonad m, Monoid a) => Text -> TagParser m a -> TagParser m a
pInTags tagtype parser = pInTags' tagtype (const True) parser
pInTags' :: (PandocMonad m, Monoid a)
=> Text
-> (Tag Text -> Bool)
-> TagParser m a
-> TagParser m a
pInTags' tagtype tagtest parser = try $ do
pSatisfy (\t -> t ~== TagOpen tagtype [] && tagtest t)
mconcat <$> manyTill parser (pCloses tagtype <|> eof)
-- parses p, preceded by an opening tag (optional if tagsOptional)
-- and followed by a closing tag (optional if tagsOptional)
pInTag :: PandocMonad m => Bool -> Text -> TagParser m a -> TagParser m a
pInTag tagsOptional tagtype p = try $ do
skipMany pBlank
(if tagsOptional then optional else void) $ pSatisfy (matchTagOpen tagtype [])
skipMany pBlank
x <- p
skipMany pBlank
(if tagsOptional then optional else void) $ pSatisfy (matchTagClose tagtype)
skipMany pBlank
return x
pCloses :: PandocMonad m => Text -> TagParser m ()
pCloses tagtype = try $ do
t <- lookAhead $ pSatisfy $ \tag -> isTagClose tag || isTagOpen tag
case t of
(TagClose t') | t' == tagtype -> void pAny
(TagOpen t' _) | t' `closes` tagtype -> return ()
(TagClose "ul") | tagtype == "li" -> return ()
(TagClose "ol") | tagtype == "li" -> return ()
(TagClose "dl") | tagtype == "dd" -> return ()
(TagClose "table") | tagtype == "td" -> return ()
(TagClose "table") | tagtype == "tr" -> return ()
(TagClose "td") | tagtype `Set.member` blockHtmlTags -> return ()
(TagClose "th") | tagtype `Set.member` blockHtmlTags -> return ()
(TagClose t') | tagtype == "p" && t' `Set.member` blockHtmlTags
-> return () -- see #3794
_ -> mzero
pTagText :: PandocMonad m => TagParser m Inlines
pTagText = try $ do
(TagText str) <- pSatisfy isTagText
st <- getState
qu <- ask
parsed <- lift $ lift $
flip runReaderT qu $ runParserT (many pTagContents) st "text" str
case parsed of
Left _ -> throwError $ PandocParseError $ "Could not parse `" <> str <> "'"
Right result -> return $ mconcat result
pBlank :: PandocMonad m => TagParser m ()
pBlank = try $ do
(TagText str) <- pSatisfy isTagText
guard $ T.all isSpace str
type InlinesParser m = HTMLParser m Text
pTagContents :: PandocMonad m => InlinesParser m Inlines
pTagContents =
B.displayMath <$> mathDisplay
<|> B.math <$> mathInline
<|> pStr
<|> pSpace
<|> smartPunctuation pTagContents
<|> pRawTeX
<|> pSymbol
<|> pBad
pRawTeX :: PandocMonad m => InlinesParser m Inlines
pRawTeX = do
lookAhead $ try $ do
char '\\'
choice $ map (try . string) ["begin", "eqref", "ref"]
guardEnabled Ext_raw_tex
inp <- getInput
st <- getState
res <- lift $ runParserT (withRaw rawLaTeXInline) st "chunk" inp
case res of
Left _ -> mzero
Right (contents, raw) -> do
_ <- count (T.length raw) anyChar
return $ B.rawInline "tex" contents
pStr :: PandocMonad m => InlinesParser m Inlines
pStr = do
result <- many1 $ satisfy $ \c ->
not (isSpace c) && not (isSpecial c) && not (isBad c)
updateLastStrPos
return $ B.str $ T.pack result
isSpecial :: Char -> Bool
isSpecial '"' = True
isSpecial '\'' = True
isSpecial '.' = True
isSpecial '-' = True
isSpecial '$' = True
isSpecial '\\' = True
isSpecial '\8216' = True
isSpecial '\8217' = True
isSpecial '\8220' = True
isSpecial '\8221' = True
isSpecial _ = False
pSymbol :: PandocMonad m => InlinesParser m Inlines
pSymbol = satisfy isSpecial >>= return . B.str . T.singleton
isBad :: Char -> Bool
isBad c = c >= '\128' && c <= '\159' -- not allowed in HTML
pBad :: PandocMonad m => InlinesParser m Inlines
pBad = do
c <- satisfy isBad
let c' = case c of
'\128' -> '\8364'
'\130' -> '\8218'
'\131' -> '\402'
'\132' -> '\8222'
'\133' -> '\8230'
'\134' -> '\8224'
'\135' -> '\8225'
'\136' -> '\710'
'\137' -> '\8240'
'\138' -> '\352'
'\139' -> '\8249'
'\140' -> '\338'
'\142' -> '\381'
'\145' -> '\8216'
'\146' -> '\8217'
'\147' -> '\8220'
'\148' -> '\8221'
'\149' -> '\8226'
'\150' -> '\8211'
'\151' -> '\8212'
'\152' -> '\732'
'\153' -> '\8482'
'\154' -> '\353'
'\155' -> '\8250'
'\156' -> '\339'
'\158' -> '\382'
'\159' -> '\376'
_ -> '?'
return $ B.str $ T.singleton c'
pSpace :: PandocMonad m => InlinesParser m Inlines
pSpace = many1 (satisfy isSpace) >>= \xs ->
if '\n' `elem` xs
then return B.softbreak
else return B.space
--
-- Constants
--
eitherBlockOrInline :: Set.Set Text
eitherBlockOrInline = Set.fromList
["audio", "applet", "button", "iframe", "embed",
"del", "ins", "progress", "map", "area", "noscript", "script",
"object", "svg", "video", "source"]
blockHtmlTags :: Set.Set Text
blockHtmlTags = Set.fromList
["?xml", "!DOCTYPE", "address", "article", "aside",
"blockquote", "body", "canvas",
"caption", "center", "col", "colgroup", "dd", "details",
"dir", "div", "dl", "dt", "fieldset", "figcaption", "figure",
"footer", "form", "h1", "h2", "h3", "h4",
"h5", "h6", "head", "header", "hgroup", "hr", "html",
"isindex", "main", "menu", "meta", "noframes", "ol", "output", "p", "pre",
"section", "table", "tbody", "textarea",
"thead", "tfoot", "ul", "dd",
"dt", "frameset", "li", "tbody", "td", "tfoot",
"th", "thead", "tr", "script", "style"]
-- We want to allow raw docbook in markdown documents, so we
-- include docbook block tags here too.
blockDocBookTags :: Set.Set Text
blockDocBookTags = Set.fromList
["calloutlist", "bibliolist", "glosslist", "itemizedlist",
"orderedlist", "segmentedlist", "simplelist",
"variablelist", "caution", "important", "note", "tip",
"warning", "address", "literallayout", "programlisting",
"programlistingco", "screen", "screenco", "screenshot",
"synopsis", "example", "informalexample", "figure",
"informalfigure", "table", "informaltable", "para",
"simpara", "formalpara", "equation", "informalequation",
"figure", "screenshot", "mediaobject", "qandaset",
"procedure", "task", "cmdsynopsis", "funcsynopsis",
"classsynopsis", "blockquote", "epigraph", "msgset",
"sidebar", "title"]
epubTags :: Set.Set Text
epubTags = Set.fromList ["case", "switch", "default"]
blockTags :: Set.Set Text
blockTags = Set.unions [blockHtmlTags, blockDocBookTags, epubTags]
class NamedTag a where
getTagName :: a -> Maybe Text
instance NamedTag (Tag Text) where
getTagName (TagOpen t _) = Just t
getTagName (TagClose t) = Just t
getTagName _ = Nothing
instance NamedTag (Tag String) where
getTagName (TagOpen t _) = Just (T.pack t)
getTagName (TagClose t) = Just (T.pack t)
getTagName _ = Nothing
isInlineTag :: NamedTag (Tag a) => Tag a -> Bool
isInlineTag t =
isCommentTag t || case getTagName t of
Nothing -> False
Just x -> x `Set.notMember` blockTags ||
T.take 1 x == "?" -- processing instr.
isBlockTag :: NamedTag (Tag a) => Tag a -> Bool
isBlockTag t = isBlockTagName || isTagComment t
where isBlockTagName =
case getTagName t of
Just x
| "?" `T.isPrefixOf` x -> True
| "!" `T.isPrefixOf` x -> True
| otherwise -> x `Set.member` blockTags
|| x `Set.member` eitherBlockOrInline
Nothing -> False
isTextTag :: Tag a -> Bool
isTextTag = tagText (const True)
isCommentTag :: Tag a -> Bool
isCommentTag = tagComment (const True)
-- taken from HXT and extended
-- See http://www.w3.org/TR/html5/syntax.html sec 8.1.2.4 optional tags
closes :: Text -> Text -> Bool
_ `closes` "body" = False
_ `closes` "html" = False
"body" `closes` "head" = True
"a" `closes` "a" = True
"li" `closes` "li" = True
"th" `closes` t | t `elem` ["th","td"] = True
"td" `closes` t | t `elem` ["th","td"] = True
"tr" `closes` t | t `elem` ["th","td","tr"] = True
"dd" `closes` t | t `elem` ["dt", "dd"] = True
"dt" `closes` t | t `elem` ["dt","dd"] = True
"rt" `closes` t | t `elem` ["rb", "rt", "rtc"] = True
"optgroup" `closes` "optgroup" = True
"optgroup" `closes` "option" = True
"option" `closes` "option" = True
-- https://html.spec.whatwg.org/multipage/syntax.html#optional-tags
x `closes` "p" | x `elem` ["address", "article", "aside", "blockquote",
"dir", "div", "dl", "fieldset", "footer", "form", "h1", "h2", "h3", "h4",
"h5", "h6", "header", "hr", "main", "menu", "nav", "ol", "p", "pre", "section",
"table", "ul"] = True
_ `closes` "meta" = True
"form" `closes` "form" = True
"label" `closes` "label" = True
"map" `closes` "map" = True
"object" `closes` "object" = True
_ `closes` t | t `elem` ["option","style","script","textarea","title"] = True
t `closes` "select" | t /= "option" = True
"thead" `closes` t | t `elem` ["colgroup"] = True
"tfoot" `closes` t | t `elem` ["thead","colgroup"] = True
"tbody" `closes` t | t `elem` ["tbody","tfoot","thead","colgroup"] = True
t `closes` t2 |
t `elem` ["h1","h2","h3","h4","h5","h6","dl","ol","ul","table","div","main","p"] &&
t2 `elem` ["h1","h2","h3","h4","h5","h6","p" ] = True -- not "div" or "main"
t1 `closes` t2 |
t1 `Set.member` blockTags &&
t2 `Set.notMember` blockTags &&
t2 `Set.notMember` eitherBlockOrInline = True
_ `closes` _ = False
--- parsers for use in markdown, textile readers
-- | Matches a stretch of HTML in balanced tags.
htmlInBalanced :: Monad m
=> (Tag Text -> Bool)
-> ParserT Text st m Text
htmlInBalanced f = try $ do
lookAhead (char '<')
inp <- getInput
let ts = canonicalizeTags $
parseTagsOptions parseOptions{ optTagWarning = True,
optTagPosition = True } inp
case ts of
(TagPosition sr sc : t@(TagOpen tn _) : rest) -> do
guard $ f t
guard $ not $ hasTagWarning (t : take 1 rest)
case htmlInBalanced' tn (t:rest) of
[] -> mzero
xs -> case reverse xs of
(TagClose _ : TagPosition er ec : _) -> do
let ls = er - sr
let cs = ec - sc
lscontents <- T.unlines <$> count ls anyLine
cscontents <- count cs anyChar
closetag <- do
x <- many (satisfy (/='>'))
char '>'
return (x <> ">")
return $ lscontents <> T.pack cscontents <> T.pack closetag
_ -> mzero
_ -> mzero
htmlInBalanced' :: Text
-> [Tag Text]
-> [Tag Text]
htmlInBalanced' tagname ts = fromMaybe [] $ go 0 ts
where go :: Int -> [Tag Text] -> Maybe [Tag Text]
go n (t@(TagOpen tn' _):rest) | tn' == tagname =
(t :) <$> go (n + 1) rest
go 1 (t@(TagClose tn'):_) | tn' == tagname =
return [t]
go n (t@(TagClose tn'):rest) | tn' == tagname =
(t :) <$> go (n - 1) rest
go n (t:ts') = (t :) <$> go n ts'
go _ [] = mzero
hasTagWarning :: [Tag a] -> Bool
hasTagWarning (TagWarning _:_) = True
hasTagWarning _ = False
-- | Matches a tag meeting a certain condition.
htmlTag :: (HasReaderOptions st, Monad m)
=> (Tag Text -> Bool)
-> ParserT Text st m (Tag Text, Text)
htmlTag f = try $ do
lookAhead (char '<')
startpos <- getPosition
inp <- getInput
let ts = canonicalizeTags $ parseTagsOptions
parseOptions{ optTagWarning = False
, optTagPosition = True }
(inp <> " ") -- add space to ensure that
-- we get a TagPosition after the tag
(next, ln, col) <- case ts of
(TagPosition{} : next : TagPosition ln col : _)
| f next -> return (next, ln, col)
_ -> mzero
-- <www.boe.es/buscar/act.php?id=BOE-A-1996-8930#a66>
-- should NOT be parsed as an HTML tag, see #2277,
-- so we exclude . even though it's a valid character
-- in XML element names
let isNameChar c = isAlphaNum c || c == ':' || c == '-' || c == '_'
let isName s = case T.uncons s of
Nothing -> False
Just (c, cs) -> isLetter c && T.all isNameChar cs
let isPI s = case T.uncons s of
Just ('?', _) -> True -- processing instruction
_ -> False
let endpos = if ln == 1
then setSourceColumn startpos
(sourceColumn startpos + (col - 1))
else setSourceColumn (setSourceLine startpos
(sourceLine startpos + (ln - 1)))
col
let endAngle = try $
do char '>'
pos <- getPosition
guard $ pos >= endpos
let handleTag tagname = do
-- basic sanity check, since the parser is very forgiving
-- and finds tags in stuff like x<y)
guard $ isName tagname || isPI tagname
guard $ not $ T.null tagname
-- <https://example.org> should NOT be a tag either.
-- tagsoup will parse it as TagOpen "https:" [("example.org","")]
guard $ T.last tagname /= ':'
char '<'
rendered <- manyTill anyChar endAngle
return (next, T.pack $ "<" ++ rendered ++ ">")
case next of
TagComment s
| "<!--" `T.isPrefixOf` inp -> do
string "<!--"
count (T.length s) anyChar
string "-->"
stripComments <- getOption readerStripComments
if stripComments
then return (next, "")
else return (next, "<!--" <> s <> "-->")
| otherwise -> Prelude.fail "bogus comment mode, HTML5 parse error"
TagOpen tagname attr -> do
guard $ isPI tagname || all (isName . fst) attr
handleTag tagname
TagClose tagname ->
handleTag tagname
_ -> mzero
mkAttr :: [(Text, Text)] -> Attr
mkAttr attr = (attribsId, attribsClasses, attribsKV)
where attribsId = fromMaybe "" $ lookup "id" attr
attribsClasses = T.words (fromMaybe "" $ lookup "class" attr) <> epubTypes
attribsKV = filter (\(k,_) -> k /= "class" && k /= "id") attr
epubTypes = T.words $ fromMaybe "" $ lookup "epub:type" attr
-- Strip namespace prefixes
stripPrefixes :: [Tag Text] -> [Tag Text]
stripPrefixes = map stripPrefix
stripPrefix :: Tag Text -> Tag Text
stripPrefix (TagOpen s as) =
TagOpen (stripPrefix' s) (map (first stripPrefix') as)
stripPrefix (TagClose s) = TagClose (stripPrefix' s)
stripPrefix x = x
stripPrefix' :: Text -> Text
stripPrefix' s =
if T.null t then s else T.drop 1 t
where (_, t) = T.span (/= ':') s
isSpace :: Char -> Bool
isSpace ' ' = True
isSpace '\t' = True
isSpace '\n' = True
isSpace '\r' = True
isSpace _ = False
-- Utilities
-- | Adjusts a url according to the document's base URL.
canonicalizeUrl :: PandocMonad m => Text -> TagParser m Text
canonicalizeUrl url = do
mbBaseHref <- baseHref <$> getState
return $ case (parseURIReference (T.unpack url), mbBaseHref) of
(Just rel, Just bs) -> tshow (rel `nonStrictRelativeTo` bs)
_ -> url
-- Instances
instance HasMacros HTMLState where
extractMacros = macros
updateMacros f st = st{ macros = f $ macros st }
instance HasIdentifierList HTMLState where
extractIdentifierList = identifiers
updateIdentifierList f s = s{ identifiers = f (identifiers s) }
instance HasLogMessages HTMLState where
addLogMessage m s = s{ logMessages = m : logMessages s }
getLogMessages = reverse . logMessages
-- This signature should be more general
-- MonadReader HTMLLocal m => HasQuoteContext st m
instance PandocMonad m => HasQuoteContext HTMLState (ReaderT HTMLLocal m) where
getQuoteContext = asks quoteContext
withQuoteContext q = local (\s -> s{quoteContext = q})
instance HasReaderOptions HTMLState where
extractReaderOptions = extractReaderOptions . parserState
instance HasMeta HTMLState where
setMeta s b st = st {parserState = setMeta s b $ parserState st}
deleteMeta s st = st {parserState = deleteMeta s $ parserState st}
instance Default HTMLLocal where
def = HTMLLocal NoQuote False False
instance HasLastStrPosition HTMLState where
setLastStrPos s st = st {parserState = setLastStrPos s (parserState st)}
getLastStrPos = getLastStrPos . parserState
-- For now we need a special version here; the one in Shared has String type
renderTags' :: [Tag Text] -> Text
renderTags' = renderTagsOptions
renderOptions{ optMinimize = matchTags ["hr", "br", "img",
"meta", "link"]
, optRawTag = matchTags ["script", "style"] }
where matchTags tags = flip elem tags . T.toLower
-- EPUB Specific
--
--
sectioningContent :: [Text]
sectioningContent = ["article", "aside", "nav", "section"]
groupingContent :: [Text]
groupingContent = ["p", "hr", "pre", "blockquote", "ol"
, "ul", "li", "dl", "dt", "dt", "dd"
, "figure", "figcaption", "div", "main"]
matchTagClose :: Text -> (Tag Text -> Bool)
matchTagClose t = (~== TagClose t)
matchTagOpen :: Text -> [(Text, Text)] -> (Tag Text -> Bool)
matchTagOpen t as = (~== TagOpen t as)
{-
types :: [(String, ([String], Int))]
types = -- Document divisions
map (\s -> (s, (["section", "body"], 0)))
["volume", "part", "chapter", "division"]
<> -- Document section and components
[
("abstract", ([], 0))]
-}
|