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-- | Converts Pandoc to HTML.
module Text.Pandoc.Writers.HTML (
writeHtml
) where
import Text.Pandoc.Definition
import Text.Pandoc.Shared
import Text.Html ( stringToHtmlString )
import Text.Regex ( mkRegex )
import Numeric ( showHex )
import Char ( ord )
import Data.List ( isPrefixOf, partition )
-- | Convert Pandoc document to string in HTML format.
writeHtml :: WriterOptions -> Pandoc -> String
writeHtml options (Pandoc (Meta title authors date) blocks) =
let titlePrefix = writerTitlePrefix options in
let topTitle = if not (null titlePrefix) then
[Str titlePrefix] ++ (if not (null title) then [Str " - "] ++ title else [])
else
title in
let head = if (writerStandalone options) then
htmlHeader options (Meta topTitle authors date)
else
""
titleBlocks = if (writerStandalone options) && (not (null title)) &&
(not (writerS5 options)) then
[RawHtml "<h1 class=\"title\">", Plain title, RawHtml "</h1>\n"]
else
[]
foot = if (writerStandalone options) then "</body>\n</html>\n" else ""
blocks' = replaceReferenceLinks (titleBlocks ++ blocks)
(noteBlocks, blocks'') = partition isNoteBlock blocks'
body = (writerIncludeBefore options) ++
concatMap (blockToHtml options) blocks'' ++
footnoteSection options noteBlocks ++
(writerIncludeAfter options) in
head ++ body ++ foot
-- | Convert list of Note blocks to a footnote <div>. Assumes notes are sorted.
footnoteSection :: WriterOptions -> [Block] -> String
footnoteSection options notes =
if null notes
then ""
else "<div class=\"footnotes\">\n<hr />\n<ol>\n" ++
concatMap (blockToHtml options) notes ++
"</ol>\n</div>\n"
-- | Obfuscate a "mailto:" link using Javascript.
obfuscateLink :: WriterOptions -> [Inline] -> String -> String
obfuscateLink options text src =
let text' = inlineListToHtml options text in
let linkText = if src == ("mailto:" ++ text') then "e" else "'" ++ text' ++ "'"
altText = if src == ("mailto:" ++ text') then "\\1 [at] \\2" else text' ++ " (\\1 [at] \\2)" in
gsub "mailto:([^@]*)@(.*)" ("<script type=\"text/javascript\">h='\\2';n='\\1';e=n+'@'+h;document.write('<a href=\"mailto:'+e+'\">'+" ++ linkText ++ "+'<\\/a>');</script><noscript>" ++ altText ++ "</noscript>") src
-- | Obfuscate character as entity.
obfuscateChar :: Char -> String
obfuscateChar char = let num = ord char in
let numstr = if even num then (show num) else ("x" ++ (showHex num "")) in
"&#" ++ numstr ++ ";"
-- | Escape string, preserving character entities and quote.
stringToHtml :: String -> String
stringToHtml str = escapePreservingRegex stringToHtmlString (mkRegex "\"|(&[[:alnum:]]*;)") str
-- | Escape string as in 'stringToHtml' but add smart typography filter.
stringToSmartHtml :: String -> String
stringToSmartHtml =
let escapeDoubleQuotes =
gsub "(\"|")" "”" . -- rest are right quotes
gsub "(\"|")(&r[sd]quo;)" "”\\2" . -- never left quo before right quo
gsub "(&l[sd]quo;)(\"|")" "\\2“" . -- never right quo after left quo
gsub "([ \t])(\"|")" "\\1“" . -- never right quo after space
gsub "(\"|")([^,.;:!?^) \t-])" "“\\2" . -- "word left
gsub "(\"|")('|`|‘)" "”’" . -- right if it got through last filter
gsub "(\"|")('|`|‘)([^,.;:!?^) \t-])" "“‘\\3" . -- "'word left
gsub "``" "“" .
gsub "''" "”"
escapeSingleQuotes =
gsub "'" "’" . -- otherwise right
gsub "'(&r[sd]quo;)" "’\\1" . -- never left quo before right quo
gsub "(&l[sd]quo;)'" "\\1‘" . -- never right quo after left quo
gsub "([ \t])'" "\\1‘" . -- never right quo after space
gsub "`" "‘" . -- ` is left
gsub "([^,.;:!?^) \t-])'" "\\1’" . -- word' right
gsub "^('|`)([^,.;:!?^) \t-])" "‘\\2" . -- 'word left
gsub "('|`)(\"|"|“|``)" "‘“" . -- '"word left
gsub "([^,.;:!?^) \t-])'(s|S)" "\\1’\\2" . -- possessive
gsub "([[:space:]])'([^,.;:!?^) \t-])" "\\1‘\\2" . -- 'word left
gsub "'([0-9][0-9](s|S))" "’\\1" -- '80s - decade abbrevs.
escapeDashes = gsub " ?-- ?" "—" .
gsub " ?--- ?" "—" .
gsub "([0-9])--?([0-9])" "\\1–\\2"
escapeEllipses = gsub "\\.\\.\\.|\\. \\. \\." "…" in
escapeSingleQuotes . escapeDoubleQuotes . escapeDashes . escapeEllipses . stringToHtml
-- | Escape code string as needed for HTML.
codeStringToHtml :: String -> String
codeStringToHtml [] = []
codeStringToHtml (x:xs) = case x of
'&' -> "&" ++ codeStringToHtml xs
'<' -> "<" ++ codeStringToHtml xs
_ -> x:(codeStringToHtml xs)
-- | Escape string to HTML appropriate for attributes
attributeStringToHtml :: String -> String
attributeStringToHtml = gsub "\"" """
-- | Returns an HTML header with appropriate bibliographic information.
htmlHeader :: WriterOptions -> Meta -> String
htmlHeader options (Meta title authors date) =
let titletext = "<title>" ++ (inlineListToHtml options title) ++ "</title>\n"
authortext = if (null authors) then
""
else
"<meta name=\"author\" content=\"" ++
(joinWithSep ", " (map stringToHtml authors)) ++ "\" />\n"
datetext = if (date == "") then
""
else
"<meta name=\"date\" content=\"" ++ (stringToHtml date) ++ "\" />\n" in
(writerHeader options) ++ authortext ++ datetext ++ titletext ++ "</head>\n<body>\n"
-- | Convert Pandoc block element to HTML.
blockToHtml :: WriterOptions -> Block -> String
blockToHtml options Blank = "\n"
blockToHtml options Null = ""
blockToHtml options (Plain lst) = inlineListToHtml options lst
blockToHtml options (Para lst) = "<p>" ++ (inlineListToHtml options lst) ++ "</p>\n"
blockToHtml options (BlockQuote blocks) =
if (writerS5 options) then -- in S5, treat list in blockquote specially
-- if default is incremental, make it nonincremental; otherwise incremental
let inc = not (writerIncremental options) in
case blocks of
[BulletList lst] -> blockToHtml (options {writerIncremental = inc}) (BulletList lst)
[OrderedList lst] -> blockToHtml (options {writerIncremental = inc}) (OrderedList lst)
otherwise -> "<blockquote>\n" ++ (concatMap (blockToHtml options) blocks) ++
"</blockquote>\n"
else
"<blockquote>\n" ++ (concatMap (blockToHtml options) blocks) ++ "</blockquote>\n"
blockToHtml options (Note ref lst) =
let contents = (concatMap (blockToHtml options) lst) in
"<li id=\"fn" ++ ref ++ "\">" ++ contents ++ " <a href=\"#fnref" ++ ref ++
"\" class=\"footnoteBacklink\" title=\"Jump back to footnote " ++ ref ++
"\">↩</a></li>\n"
blockToHtml options (Key _ _) = ""
blockToHtml options (CodeBlock str) = "<pre><code>" ++ (codeStringToHtml str) ++
"\n</code></pre>\n"
blockToHtml options (RawHtml str) = str
blockToHtml options (BulletList lst) =
let attribs = if (writerIncremental options) then " class=\"incremental\"" else "" in
"<ul" ++ attribs ++ ">\n" ++ (concatMap (listItemToHtml options) lst) ++ "</ul>\n"
blockToHtml options (OrderedList lst) =
let attribs = if (writerIncremental options) then " class=\"incremental\"" else "" in
"<ol" ++ attribs ++ ">\n" ++ (concatMap (listItemToHtml options) lst) ++ "</ol>\n"
blockToHtml options HorizontalRule = "<hr />\n"
blockToHtml options (Header level lst) =
let contents = inlineListToHtml options lst in
let simplify = gsub "<[^>]*>" "" . gsub " " "_" in
if ((level > 0) && (level <= 6))
then "<a id=\"" ++ simplify contents ++ "\"></a>\n" ++
"<h" ++ (show level) ++ ">" ++ contents ++
"</h" ++ (show level) ++ ">\n"
else "<p>" ++ contents ++ "</p>\n"
listItemToHtml options list = "<li>" ++ (concatMap (blockToHtml options) list) ++ "</li>\n"
-- | Convert list of Pandoc inline elements to HTML.
inlineListToHtml :: WriterOptions -> [Inline] -> String
inlineListToHtml options lst =
-- consolidate adjacent Str and Space elements for more intelligent
-- smart typography filtering
let lst' = consolidateList lst in
concatMap (inlineToHtml options) lst'
-- | Convert Pandoc inline element to HTML.
inlineToHtml :: WriterOptions -> Inline -> String
inlineToHtml options (Emph lst) = "<em>" ++ (inlineListToHtml options lst) ++ "</em>"
inlineToHtml options (Strong lst) = "<strong>" ++ (inlineListToHtml options lst) ++ "</strong>"
inlineToHtml options (Code str) = "<code>" ++ (codeStringToHtml str) ++ "</code>"
inlineToHtml options (Str str) = if (writerSmart options) then
stringToSmartHtml str
else
stringToHtml str
inlineToHtml options (TeX str) = (codeStringToHtml str)
inlineToHtml options (HtmlInline str) = str
inlineToHtml options (LineBreak) = "<br />\n"
inlineToHtml options Space = " "
inlineToHtml options (Link text (Src src tit)) =
let title = attributeStringToHtml tit in
if (isPrefixOf "mailto:" src) then
obfuscateLink options text src
else
"<a href=\"" ++ (codeStringToHtml src) ++ "\"" ++
(if tit /= "" then " title=\"" ++ title ++ "\">" else ">") ++
(inlineListToHtml options text) ++ "</a>"
inlineToHtml options (Link text (Ref [])) = "[" ++ (inlineListToHtml options text) ++ "]"
inlineToHtml options (Link text (Ref ref)) = "[" ++ (inlineListToHtml options text) ++ "][" ++
(inlineListToHtml options ref) ++ "]" -- this is what markdown does, for better or worse
inlineToHtml options (Image alt (Src source tit)) =
let title = attributeStringToHtml tit
alternate = inlineListToHtml options alt in
"<img src=\"" ++ source ++ "\"" ++
(if tit /= "" then " title=\"" ++ title ++ "\"" else "") ++
(if alternate /= "" then " alt=\"" ++ alternate ++ "\"" else "") ++ ">"
inlineToHtml options (Image alternate (Ref [])) =
"![" ++ (inlineListToHtml options alternate) ++ "]"
inlineToHtml options (Image alternate (Ref ref)) =
"![" ++ (inlineListToHtml options alternate) ++ "][" ++ (inlineListToHtml options ref) ++ "]"
inlineToHtml options (NoteRef ref) =
"<sup class=\"footnoteRef\" id=\"fnref" ++ ref ++ "\"><a href=\"#fn" ++ ref ++
"\">" ++ ref ++ "</a></sup>"
|
