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|
{-# OPTIONS_GHC -fno-warn-deprecations #-}
{-
Copyright (C) 2006-2010 John MacFarlane <jgm@berkeley.edu>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
-}
{- |
Module : Text.Pandoc.Writers.HTML
Copyright : Copyright (C) 2006-2010 John MacFarlane
License : GNU GPL, version 2 or above
Maintainer : John MacFarlane <jgm@berkeley.edu>
Stability : alpha
Portability : portable
Conversion of 'Pandoc' documents to HTML.
-}
module Text.Pandoc.Writers.HTML ( writeHtml , writeHtmlString ) where
import Text.Pandoc.Definition
import Text.Pandoc.CharacterReferences ( decodeCharacterReferences )
import Text.Pandoc.Shared
import Text.Pandoc.Templates
import Text.Pandoc.Readers.TeXMath
import Text.Pandoc.Highlighting ( highlightHtml, defaultHighlightingCss )
import Text.Pandoc.XML (stripTags, escapeStringForXML)
import Network.HTTP ( urlEncode )
import Numeric ( showHex )
import Data.Char ( ord, toLower )
import Data.List ( isPrefixOf, intersperse )
import Data.Maybe ( catMaybes )
import Control.Monad.State
import Text.XHtml.Transitional hiding ( stringToHtml )
import Text.TeXMath
import Text.XML.Light.Output
data WriterState = WriterState
{ stNotes :: [Html] -- ^ List of notes
, stMath :: Bool -- ^ Math is used in document
, stHighlighting :: Bool -- ^ Syntax highlighting is used
, stSecNum :: [Int] -- ^ Number of current section
} deriving Show
defaultWriterState :: WriterState
defaultWriterState = WriterState {stNotes= [], stMath = False, stHighlighting = False, stSecNum = []}
-- Helpers to render HTML with the appropriate function.
-- | Modified version of Text.XHtml's stringToHtml.
-- Use unicode characters wherever possible.
stringToHtml :: String -> Html
stringToHtml = primHtml . escapeStringForXML
-- | Hard linebreak.
nl :: Html
nl = primHtml "\n"
-- | Convert Pandoc document to Html string.
writeHtmlString :: WriterOptions -> Pandoc -> String
writeHtmlString opts d =
let (tit, auths, date, toc, body', newvars) = evalState (pandocToHtml opts d)
defaultWriterState
in if writerStandalone opts
then inTemplate opts tit auths date toc body' newvars
else showHtmlFragment body'
-- | Convert Pandoc document to Html structure.
writeHtml :: WriterOptions -> Pandoc -> Html
writeHtml opts d =
let (tit, auths, date, toc, body', newvars) = evalState (pandocToHtml opts d)
defaultWriterState
in if writerStandalone opts
then inTemplate opts tit auths date toc body' newvars
else body'
-- result is (title, authors, date, toc, body, new variables)
pandocToHtml :: WriterOptions
-> Pandoc
-> State WriterState (Html, [Html], Html, Maybe Html, Html, [(String,String)])
pandocToHtml opts (Pandoc (Meta title' authors' date') blocks) = do
let standalone = writerStandalone opts
tit <- if standalone
then inlineListToHtml opts title'
else return noHtml
auths <- if standalone
then mapM (inlineListToHtml opts) authors'
else return []
date <- if standalone
then inlineListToHtml opts date'
else return noHtml
let sects = hierarchicalize blocks
toc <- if writerTableOfContents opts
then tableOfContents opts sects
else return Nothing
let startSlide = RawBlock "html" "<div class=\"slide\">\n"
endSlide = RawBlock "html" "</div>\n"
let cutUp (HorizontalRule : Header 1 ys : xs) = cutUp (Header 1 ys : xs)
cutUp (HorizontalRule : xs) = [endSlide, startSlide] ++ cutUp xs
cutUp (Header 1 ys : xs) = [endSlide, startSlide] ++
(Header 1 ys : cutUp xs)
cutUp (x:xs) = x : cutUp xs
cutUp [] = []
let slides = case blocks of
(HorizontalRule : xs) -> [startSlide] ++ cutUp xs ++ [endSlide]
(Header 1 ys : xs) -> [startSlide, Header 1 ys] ++
cutUp xs ++ [endSlide]
_ -> [startSlide] ++ cutUp blocks ++
[endSlide]
blocks' <- liftM toHtmlFromList $
if writerSlideVariant opts `elem` [SlidySlides, S5Slides]
then mapM (blockToHtml opts) slides
else mapM (elementToHtml opts) sects
st <- get
let notes = reverse (stNotes st)
let thebody = blocks' +++ footnoteSection notes
let math = if stMath st
then case writerHTMLMathMethod opts of
LaTeXMathML (Just url) ->
script !
[src url, thetype "text/javascript"] $ noHtml
MathML (Just url) ->
script !
[src url, thetype "text/javascript"] $ noHtml
MathJax url ->
script ! [src url, thetype "text/javascript"] $ noHtml
JsMath (Just url) ->
script !
[src url, thetype "text/javascript"] $ noHtml
_ -> case lookup "mathml-script" (writerVariables opts) of
Just s ->
script ! [thetype "text/javascript"] <<
primHtml s
Nothing -> noHtml
else noHtml
let newvars = [("highlighting-css", defaultHighlightingCss) |
stHighlighting st] ++
[("math", renderHtmlFragment math) | stMath st]
return (tit, auths, date, toc, thebody, newvars)
inTemplate :: TemplateTarget a
=> WriterOptions
-> Html
-> [Html]
-> Html
-> Maybe Html
-> Html
-> [(String,String)]
-> a
inTemplate opts tit auths date toc body' newvars =
let renderedTit = showHtmlFragment tit
topTitle' = stripTags renderedTit
authors = map (stripTags . showHtmlFragment) auths
date' = stripTags $ showHtmlFragment date
variables = writerVariables opts ++ newvars
context = variables ++
[ ("body", renderHtmlFragment body')
, ("pagetitle", topTitle')
, ("title", renderHtmlFragment tit)
, ("date", date') ] ++
[ ("html5","true") | writerHtml5 opts ] ++
(case toc of
Just t -> [ ("toc", renderHtmlFragment t)]
Nothing -> []) ++
[ ("author", a) | a <- authors ]
in renderTemplate context $ writerTemplate opts
-- | Like Text.XHtml's identifier, but adds the writerIdentifierPrefix
prefixedId :: WriterOptions -> String -> HtmlAttr
prefixedId opts s = identifier $ writerIdentifierPrefix opts ++ s
-- | Construct table of contents from list of elements.
tableOfContents :: WriterOptions -> [Element] -> State WriterState (Maybe Html)
tableOfContents _ [] = return Nothing
tableOfContents opts sects = do
let opts' = opts { writerIgnoreNotes = True }
contents <- mapM (elementToListItem opts') sects
let tocList = catMaybes contents
return $ if null tocList
then Nothing
else Just $
if writerHtml5 opts
then tag "nav" ! [prefixedId opts' "TOC"] $
unordList tocList
else thediv ! [prefixedId opts' "TOC"] $
unordList tocList
-- | Convert section number to string
showSecNum :: [Int] -> String
showSecNum = concat . intersperse "." . map show
-- | Converts an Element to a list item for a table of contents,
-- retrieving the appropriate identifier from state.
elementToListItem :: WriterOptions -> Element -> State WriterState (Maybe Html)
elementToListItem _ (Blk _) = return Nothing
elementToListItem opts (Sec _ num id' headerText subsecs) = do
let sectnum = if writerNumberSections opts
then (thespan ! [theclass "toc-section-number"] << showSecNum num) +++
stringToHtml " "
else noHtml
txt <- liftM (sectnum +++) $ inlineListToHtml opts headerText
subHeads <- mapM (elementToListItem opts) subsecs >>= return . catMaybes
let subList = if null subHeads
then noHtml
else unordList subHeads
return $ Just $ (anchor ! [href ("#" ++ writerIdentifierPrefix opts ++ id')] $ txt) +++ subList
-- | Convert an Element to Html.
elementToHtml :: WriterOptions -> Element -> State WriterState Html
elementToHtml opts (Blk block) = blockToHtml opts block
elementToHtml opts (Sec level num id' title' elements) = do
innerContents <- mapM (elementToHtml opts) elements
modify $ \st -> st{stSecNum = num} -- update section number
header' <- blockToHtml opts (Header level title')
let slides = writerSlideVariant opts `elem` [SlidySlides, S5Slides]
let header'' = header' ! [prefixedId opts id' |
not (writerStrictMarkdown opts ||
writerSectionDivs opts || slides)]
let stuff = header'' : innerContents
return $ if slides -- S5 gets confused by the extra divs around sections
then toHtmlFromList stuff
else if writerSectionDivs opts
then if writerHtml5 opts
then tag "section" ! [prefixedId opts id']
<< stuff
else thediv ! [prefixedId opts id'] << stuff
else toHtmlFromList stuff
-- | Convert list of Note blocks to a footnote <div>.
-- Assumes notes are sorted.
footnoteSection :: [Html] -> Html
footnoteSection notes =
if null notes
then noHtml
else thediv ! [theclass "footnotes"] $ hr +++ (olist << notes)
-- | Parse a mailto link; return Just (name, domain) or Nothing.
parseMailto :: String -> Maybe (String, String)
parseMailto ('m':'a':'i':'l':'t':'o':':':addr) =
let (name', rest) = span (/='@') addr
domain = drop 1 rest
in Just (name', domain)
parseMailto _ = Nothing
-- | Obfuscate a "mailto:" link.
obfuscateLink :: WriterOptions -> String -> String -> Html
obfuscateLink opts txt s | writerEmailObfuscation opts == NoObfuscation =
anchor ! [href s] << txt
obfuscateLink opts txt s =
let meth = writerEmailObfuscation opts
s' = map toLower s
in case parseMailto s' of
(Just (name', domain)) ->
let domain' = substitute "." " dot " domain
at' = obfuscateChar '@'
(linkText, altText) =
if txt == drop 7 s' -- autolink
then ("'<code>'+e+'</code>'", name' ++ " at " ++ domain')
else ("'" ++ txt ++ "'", txt ++ " (" ++ name' ++ " at " ++
domain' ++ ")")
in case meth of
ReferenceObfuscation ->
-- need to use primHtml or &'s are escaped to & in URL
primHtml $ "<a href=\"" ++ (obfuscateString s')
++ "\">" ++ (obfuscateString txt) ++ "</a>"
JavascriptObfuscation ->
(script ! [thetype "text/javascript"] $
primHtml ("\n<!--\nh='" ++
obfuscateString domain ++ "';a='" ++ at' ++ "';n='" ++
obfuscateString name' ++ "';e=n+a+h;\n" ++
"document.write('<a h'+'ref'+'=\"ma'+'ilto'+':'+e+'\">'+" ++
linkText ++ "+'<\\/'+'a'+'>');\n// -->\n")) +++
noscript (primHtml $ obfuscateString altText)
_ -> error $ "Unknown obfuscation method: " ++ show meth
_ -> anchor ! [href s] $ stringToHtml txt -- malformed email
-- | Obfuscate character as entity.
obfuscateChar :: Char -> String
obfuscateChar char =
let num = ord char
numstr = if even num then show num else "x" ++ showHex num ""
in "&#" ++ numstr ++ ";"
-- | Obfuscate string using entities.
obfuscateString :: String -> String
obfuscateString = concatMap obfuscateChar . decodeCharacterReferences
attrsToHtml :: WriterOptions -> Attr -> [HtmlAttr]
attrsToHtml opts (id',classes',keyvals) =
[theclass (unwords classes') | not (null classes')] ++
[prefixedId opts id' | not (null id')] ++
map (\(x,y) -> strAttr x y) keyvals
-- | Convert Pandoc block element to HTML.
blockToHtml :: WriterOptions -> Block -> State WriterState Html
blockToHtml _ Null = return noHtml
blockToHtml opts (Plain lst) = inlineListToHtml opts lst
blockToHtml opts (Para [Image txt (s,tit)]) = do
img <- inlineToHtml opts (Image txt (s,tit))
capt <- inlineListToHtml opts txt
return $ if writerHtml5 opts
then tag "figure" <<
[img, tag "figcaption" << capt] +++ nl
else thediv ! [theclass "figure"] <<
[img, paragraph ! [theclass "caption"] << capt] +++ nl
blockToHtml opts (Para lst) = do
contents <- inlineListToHtml opts lst
return $ paragraph contents +++ nl
blockToHtml _ (RawBlock "html" str) = return $ primHtml str
blockToHtml _ (RawBlock _ _) = return noHtml
blockToHtml _ (HorizontalRule) = return $ hr +++ nl
blockToHtml opts (CodeBlock (id',classes,keyvals) rawCode) = do
let classes' = if writerLiterateHaskell opts
then classes
else filter (/= "literate") classes
case highlightHtml False (id',classes',keyvals) rawCode of
Left _ -> -- change leading newlines into <br /> tags, because some
-- browsers ignore leading newlines in pre blocks
let (leadingBreaks, rawCode') = span (=='\n') rawCode
attrs = attrsToHtml opts (id', classes', keyvals)
addBird = if "literate" `elem` classes'
then unlines . map ("> " ++) . lines
else unlines . lines
in return $ pre ! attrs $ thecode <<
(replicate (length leadingBreaks) br +++
[stringToHtml $ addBird rawCode']) +++ nl
Right h -> modify (\st -> st{ stHighlighting = True }) >>
return (h +++ nl)
blockToHtml opts (BlockQuote blocks) =
-- in S5, treat list in blockquote specially
-- if default is incremental, make it nonincremental;
-- otherwise incremental
if writerSlideVariant opts /= NoSlides
then let inc = not (writerIncremental opts) in
case blocks of
[BulletList lst] -> blockToHtml (opts {writerIncremental = inc})
(BulletList lst)
[OrderedList attribs lst] ->
blockToHtml (opts {writerIncremental = inc})
(OrderedList attribs lst)
_ -> blockListToHtml opts blocks >>=
(return . blockquote)
else do
contents <- blockListToHtml opts blocks
return $ blockquote contents +++ nl
blockToHtml opts (Header level lst) = do
contents <- inlineListToHtml opts lst
secnum <- liftM stSecNum get
let contents' = if writerNumberSections opts
then (thespan ! [theclass "header-section-number"] << showSecNum secnum) +++
stringToHtml " " +++ contents
else contents
let contents'' = if writerTableOfContents opts
then anchor ! [href $ "#" ++ writerIdentifierPrefix opts ++ "TOC"] $ contents'
else contents'
return $ (case level of
1 -> h1 contents''
2 -> h2 contents''
3 -> h3 contents''
4 -> h4 contents''
5 -> h5 contents''
6 -> h6 contents''
_ -> paragraph contents'') +++ nl
blockToHtml opts (BulletList lst) = do
contents <- mapM (blockListToHtml opts) lst
let attribs = if writerIncremental opts
then [theclass "incremental"]
else []
return $ (unordList ! attribs) contents +++ nl
blockToHtml opts (OrderedList (startnum, numstyle, _) lst) = do
contents <- mapM (blockListToHtml opts) lst
let numstyle' = camelCaseToHyphenated $ show numstyle
let attribs = (if writerIncremental opts
then [theclass "incremental"]
else []) ++
(if startnum /= 1
then [start startnum]
else []) ++
(if numstyle /= DefaultStyle
then if writerHtml5 opts
then [strAttr "type" $
case numstyle of
Decimal -> "1"
LowerAlpha -> "a"
UpperAlpha -> "A"
LowerRoman -> "i"
UpperRoman -> "I"
_ -> "1"]
else [thestyle $ "list-style-type: " ++
numstyle']
else [])
return $ (ordList ! attribs) contents +++ nl
blockToHtml opts (DefinitionList lst) = do
contents <- mapM (\(term, defs) ->
do term' <- liftM (dterm <<) $ inlineListToHtml opts term
defs' <- mapM (liftM (ddef <<) . blockListToHtml opts) defs
return $ nl : term' : nl : defs') lst
let attribs = if writerIncremental opts
then [theclass "incremental"]
else []
return $ (dlist ! attribs << concat contents) +++ nl
blockToHtml opts (Table capt aligns widths headers rows') = do
captionDoc <- if null capt
then return noHtml
else inlineListToHtml opts capt >>= return . caption
let percent w = show (truncate (100*w) :: Integer) ++ "%"
let widthAttrs w = if writerHtml5 opts
then [thestyle $ "width: " ++ percent w]
else [width $ percent w]
let coltags = if all (== 0.0) widths
then noHtml
else concatHtml $ map
(\w -> col ! (widthAttrs w) $ noHtml) widths
head' <- if all null headers
then return noHtml
else liftM (thead <<) $ tableRowToHtml opts aligns 0 headers
body' <- liftM (tbody <<) $
zipWithM (tableRowToHtml opts aligns) [1..] rows'
return $ table $ captionDoc +++ coltags +++ head' +++ body' +++ nl
tableRowToHtml :: WriterOptions
-> [Alignment]
-> Int
-> [[Block]]
-> State WriterState Html
tableRowToHtml opts aligns rownum cols' = do
let mkcell = if rownum == 0 then th else td
let rowclass = case rownum of
0 -> "header"
x | x `rem` 2 == 1 -> "odd"
_ -> "even"
cols'' <- sequence $ zipWith
(\alignment item -> tableItemToHtml opts mkcell alignment item)
aligns cols'
return $ (tr ! [theclass rowclass] $ toHtmlFromList cols'') +++ nl
alignmentToString :: Alignment -> [Char]
alignmentToString alignment = case alignment of
AlignLeft -> "left"
AlignRight -> "right"
AlignCenter -> "center"
AlignDefault -> "left"
tableItemToHtml :: WriterOptions
-> (Html -> Html)
-> Alignment
-> [Block]
-> State WriterState Html
tableItemToHtml opts tag' align' item = do
contents <- blockListToHtml opts item
let alignAttrs = if writerHtml5 opts
then [thestyle $ "align: " ++ alignmentToString align']
else [align $ alignmentToString align']
return $ (tag' ! alignAttrs) contents +++ nl
blockListToHtml :: WriterOptions -> [Block] -> State WriterState Html
blockListToHtml opts lst =
mapM (blockToHtml opts) lst >>= return . toHtmlFromList
-- | Convert list of Pandoc inline elements to HTML.
inlineListToHtml :: WriterOptions -> [Inline] -> State WriterState Html
inlineListToHtml opts lst =
mapM (inlineToHtml opts) lst >>= return . toHtmlFromList
-- | Convert Pandoc inline element to HTML.
inlineToHtml :: WriterOptions -> Inline -> State WriterState Html
inlineToHtml opts inline =
case inline of
(Str str) -> return $ stringToHtml str
(Space) -> return $ stringToHtml " "
(LineBreak) -> return br
(EmDash) -> return $ stringToHtml "—"
(EnDash) -> return $ stringToHtml "–"
(Ellipses) -> return $ stringToHtml "…"
(Apostrophe) -> return $ stringToHtml "’"
(Emph lst) -> inlineListToHtml opts lst >>= return . emphasize
(Strong lst) -> inlineListToHtml opts lst >>= return . strong
(Code attr str) -> case highlightHtml True attr str of
Left _ -> return
$ thecode ! (attrsToHtml opts attr)
$ stringToHtml str
Right h -> return h
(Strikeout lst) -> inlineListToHtml opts lst >>=
return . (thespan ! [thestyle "text-decoration: line-through;"])
(SmallCaps lst) -> inlineListToHtml opts lst >>=
return . (thespan ! [thestyle "font-variant: small-caps;"])
(Superscript lst) -> inlineListToHtml opts lst >>= return . sup
(Subscript lst) -> inlineListToHtml opts lst >>= return . sub
(Quoted quoteType lst) ->
let (leftQuote, rightQuote) = case quoteType of
SingleQuote -> (stringToHtml "‘",
stringToHtml "’")
DoubleQuote -> (stringToHtml "“",
stringToHtml "”")
in do contents <- inlineListToHtml opts lst
return $ leftQuote +++ contents +++ rightQuote
(Math t str) -> modify (\st -> st {stMath = True}) >>
(case writerHTMLMathMethod opts of
LaTeXMathML _ ->
-- putting LaTeXMathML in container with class "LaTeX" prevents
-- non-math elements on the page from being treated as math by
-- the javascript
return $ thespan ! [theclass "LaTeX"] $
case t of
InlineMath -> primHtml ("$" ++ str ++ "$")
DisplayMath -> primHtml ("$$" ++ str ++ "$$")
JsMath _ -> do
let m = primHtml str
return $ case t of
InlineMath -> thespan ! [theclass "math"] $ m
DisplayMath -> thediv ! [theclass "math"] $ m
WebTeX url -> do
let m = image ! [src (url ++ urlEncode str),
alt str, title str]
return $ case t of
InlineMath -> m
DisplayMath -> br +++ m +++ br
GladTeX ->
return $ case t of
InlineMath -> primHtml $ "<EQ ENV=\"math\">" ++ str ++ "</EQ>"
DisplayMath -> primHtml $ "<EQ ENV=\"displaymath\">" ++ str ++ "</EQ>"
MathML _ -> do
let dt = if t == InlineMath
then DisplayInline
else DisplayBlock
let conf = useShortEmptyTags (const False)
defaultConfigPP
case texMathToMathML dt str of
Right r -> return $ primHtml $
ppcElement conf r
Left _ -> inlineListToHtml opts
(readTeXMath str) >>= return .
(thespan ! [theclass "math"])
MathJax _ -> return $ primHtml $
case t of
InlineMath -> "\\(" ++ str ++ "\\)"
DisplayMath -> "\\[" ++ str ++ "\\]"
PlainMath -> do
x <- inlineListToHtml opts (readTeXMath str)
let m = thespan ! [theclass "math"] $ x
return $ case t of
InlineMath -> m
DisplayMath -> br +++ m +++ br )
(RawInline "latex" str) -> case writerHTMLMathMethod opts of
LaTeXMathML _ -> do modify (\st -> st {stMath = True})
return $ primHtml str
_ -> return noHtml
(RawInline "html" str) -> return $ primHtml str
(RawInline _ _) -> return noHtml
(Link [Code _ str] (s,_)) | "mailto:" `isPrefixOf` s ->
return $ obfuscateLink opts str s
(Link txt (s,_)) | "mailto:" `isPrefixOf` s -> do
linkText <- inlineListToHtml opts txt
return $ obfuscateLink opts (show linkText) s
(Link txt (s,tit)) -> do
linkText <- inlineListToHtml opts txt
return $ anchor ! ([href s] ++
if null tit then [] else [title tit]) $
linkText
(Image txt (s,tit)) -> do
alternate <- inlineListToHtml opts txt
let alternate' = showHtmlFragment alternate
let attributes = [src s] ++
(if null tit
then []
else [title tit]) ++
if null txt
then []
else [alt alternate']
return $ image ! attributes
-- note: null title included, as in Markdown.pl
(Note contents) -> do
st <- get
let notes = stNotes st
let number = (length notes) + 1
let ref = show number
htmlContents <- blockListToNote opts ref contents
-- push contents onto front of notes
put $ st {stNotes = (htmlContents:notes)}
return $ sup <<
anchor ! [href ("#" ++ writerIdentifierPrefix opts ++ "fn" ++ ref),
theclass "footnoteRef",
prefixedId opts ("fnref" ++ ref)] << ref
(Cite _ il) -> inlineListToHtml opts il
blockListToNote :: WriterOptions -> String -> [Block] -> State WriterState Html
blockListToNote opts ref blocks =
-- If last block is Para or Plain, include the backlink at the end of
-- that block. Otherwise, insert a new Plain block with the backlink.
let backlink = [RawInline "html" $ " <a href=\"#" ++ writerIdentifierPrefix opts ++ "fnref" ++ ref ++
"\" class=\"footnoteBackLink\"" ++
" title=\"Jump back to footnote " ++ ref ++ "\">↩</a>"]
blocks' = if null blocks
then []
else let lastBlock = last blocks
otherBlocks = init blocks
in case lastBlock of
(Para lst) -> otherBlocks ++
[Para (lst ++ backlink)]
(Plain lst) -> otherBlocks ++
[Plain (lst ++ backlink)]
_ -> otherBlocks ++ [lastBlock,
Plain backlink]
in do contents <- blockListToHtml opts blocks'
return $ nl +++ (li ! [prefixedId opts ("fn" ++ ref)]) contents
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