pandoc-2.18: src/Text/Pandoc/Writers/Markdown/Inline.hs
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE ScopedTypeVariables #-}
{-# LANGUAGE ViewPatterns #-}
{- |
Module : Text.Pandoc.Writers.Markdown.Inline
Copyright : Copyright (C) 2006-2022 John MacFarlane
License : GNU GPL, version 2 or above
Maintainer : John MacFarlane <jgm@berkeley.edu>
Stability : alpha
Portability : portable
-}
module Text.Pandoc.Writers.Markdown.Inline (
inlineListToMarkdown,
linkAttributes,
attrsToMarkdown,
attrsToMarkua
) where
import Control.Monad.Reader
import Control.Monad.State.Strict
import Data.Char (isAlphaNum, isDigit)
import Data.List (find, intersperse)
import Data.List.NonEmpty (nonEmpty)
import qualified Data.Map as M
import Data.Maybe (fromMaybe)
import Data.Text (Text)
import qualified Data.Text as T
import Text.Pandoc.Class.PandocMonad (PandocMonad, report)
import Text.Pandoc.Definition
import Text.Pandoc.Logging
import Text.Pandoc.Options
import Text.Pandoc.Parsing hiding (blankline, blanklines, char, space)
import Text.DocLayout
import Text.Pandoc.Shared
import Text.Pandoc.Network.HTTP (urlEncode)
import Text.Pandoc.Writers.Shared
import Text.Pandoc.Walk
import Text.Pandoc.Writers.HTML (writeHtml5String)
import Text.Pandoc.Writers.Math (texMathToInlines)
import Text.Pandoc.XML (toHtml5Entities)
import Data.Coerce (coerce)
import Text.Pandoc.Writers.Markdown.Types (MarkdownVariant(..),
WriterState(..),
WriterEnv(..), MD)
-- | Escape special characters for Markdown.
escapeText :: WriterOptions -> Text -> Text
escapeText opts = T.pack . go' . T.unpack
where
startsWithSpace (' ':_) = True
startsWithSpace ('\t':_) = True
startsWithSpace [] = True
startsWithSpace _ = False
go' ('#':cs)
| isEnabled Ext_space_in_atx_header opts
= if startsWithSpace (dropWhile (=='#') cs)
then '\\':'#':go cs
else '#':go cs
| otherwise = '\\':'#':go cs
go' ('@':cs)
| isEnabled Ext_citations opts =
case cs of
(d:_)
| isAlphaNum d || d == '_' || d == '{'
-> '\\':'@':go cs
_ -> '@':go cs
go' cs = go cs
go [] = []
go (c:cs) =
case c of
'[' -> '\\':c:go cs
']' -> '\\':c:go cs
'`' -> '\\':c:go cs
'*' -> '\\':c:go cs
'_' -> '\\':c:go cs
'\\' | isEnabled Ext_raw_tex opts -> '\\':c:go cs
| otherwise ->
case cs of -- don't escape \ if we don't have to:
d:_ | isAlphaNum d -> c:go cs
_ -> '\\':c:go cs
'>' | isEnabled Ext_all_symbols_escapable opts -> '\\':'>':go cs
| otherwise -> ">" ++ go cs
'<' | isEnabled Ext_all_symbols_escapable opts -> '\\':'<':go cs
| otherwise -> "<" ++ go cs
'|' | isEnabled Ext_pipe_tables opts -> '\\':'|':go cs
'^' | isEnabled Ext_superscript opts -> '\\':'^':go cs
'~' | isEnabled Ext_subscript opts ||
isEnabled Ext_strikeout opts -> '\\':'~':go cs
'$' | isEnabled Ext_tex_math_dollars opts -> '\\':'$':go cs
'\'' | isEnabled Ext_smart opts -> '\\':'\'':go cs
'"' | isEnabled Ext_smart opts -> '\\':'"':go cs
'-' | isEnabled Ext_smart opts ->
case cs of
'-':_ -> '\\':'-':go cs
_ -> '-':go cs
'.' | isEnabled Ext_smart opts ->
case cs of
'.':'.':rest -> '\\':'.':'.':'.':go rest
_ -> '.':go cs
_ -> case cs of
'_':x:xs
| isEnabled Ext_intraword_underscores opts
, isAlphaNum c
, isAlphaNum x -> c : '_' : x : go xs
_ -> c : go cs
-- Escape the escape character, as well as formatting pairs
escapeMarkuaString :: Text -> Text
escapeMarkuaString s = foldr (uncurry T.replace) s [("--","~-~-"),
("**","~*~*"),("//","~/~/"),("^^","~^~^"),(",,","~,~,")]
attrsToMarkdown :: Attr -> Doc Text
attrsToMarkdown attribs = braces $ hsep [attribId, attribClasses, attribKeys]
where attribId = case attribs of
("",_,_) -> empty
(i,_,_) -> "#" <> escAttr i
attribClasses = case attribs of
(_,[],_) -> empty
(_,cs,_) -> hsep $
map (escAttr . ("."<>))
cs
attribKeys = case attribs of
(_,_,[]) -> empty
(_,_,ks) -> hsep $
map (\(k,v) -> escAttr k
<> "=\"" <>
escAttr v <> "\"") ks
escAttr = mconcat . map escAttrChar . T.unpack
escAttrChar '"' = literal "\\\""
escAttrChar '\\' = literal "\\\\"
escAttrChar c = literal $ T.singleton c
attrsToMarkua:: Attr -> Doc Text
attrsToMarkua attributes
| null list = empty
| otherwise = braces $ intercalateDocText list
where attrId = case attributes of
("",_,_) -> []
(i,_,_) -> [literal $ "id: " <> i]
-- all non explicit (key,value) attributes besides id are getting
-- a default class key to be Markua conform
attrClasses = case attributes of
(_,[],_) -> []
(_,classes,_) -> map (escAttr . ("class: " <>))
classes
attrKeyValues = case attributes of
(_,_,[]) -> []
(_,_,keyvalues) -> map ((\(k,v) -> escAttr k
<> ": " <> escAttr v) .
preprocessKeyValues) keyvalues
escAttr = mconcat . map escAttrChar . T.unpack
escAttrChar '"' = literal "\""
escAttrChar c = literal $ T.singleton c
list = concat [attrId, attrClasses, attrKeyValues]
-- if attribute key is alt, caption, title then content
-- gets wrapped inside quotes
-- attribute gets removed
preprocessKeyValues :: (Text, Text) -> (Text, Text)
preprocessKeyValues (key,value)
| key == "alt" ||
key == "caption" ||
key == "title" = (key, inquotes value)
| otherwise = (key,value)
intercalateDocText :: [Doc Text] -> Doc Text
intercalateDocText [] = empty
intercalateDocText [x] = x
intercalateDocText (x:xs) = x <> ", " <> (intercalateDocText xs)
-- | Add a (key, value) pair to Pandoc attr type
addKeyValueToAttr :: Attr -> (Text,Text) -> Attr
addKeyValueToAttr (ident,classes,kvs) (key,value)
| not (T.null key) && not (T.null value) = (ident,
classes,
(key,value): kvs)
| otherwise = (ident,classes,kvs)
linkAttributes :: WriterOptions -> Attr -> Doc Text
linkAttributes opts attr =
if (isEnabled Ext_link_attributes opts ||
isEnabled Ext_attributes opts) && attr /= nullAttr
then attrsToMarkdown attr
else empty
getKey :: Doc Text -> Key
getKey = toKey . render Nothing
findUsableIndex :: [Text] -> Int -> Int
findUsableIndex lbls i = if tshow i `elem` lbls
then findUsableIndex lbls (i + 1)
else i
getNextIndex :: PandocMonad m => MD m Int
getNextIndex = do
prevRefs <- gets stPrevRefs
refs <- gets stRefs
i <- (+ 1) <$> gets stLastIdx
modify $ \s -> s{ stLastIdx = i }
let refLbls = map (\(r,_,_) -> r) $ prevRefs ++ refs
return $ findUsableIndex refLbls i
-- | Get reference for target; if none exists, create unique one and return.
-- Prefer label if possible; otherwise, generate a unique key.
getReference :: PandocMonad m => Attr -> Doc Text -> Target -> MD m Text
getReference attr label target = do
refs <- gets stRefs
case find (\(_,t,a) -> t == target && a == attr) refs of
Just (ref, _, _) -> return ref
Nothing -> do
keys <- gets stKeys
let key = getKey label
let rawkey = coerce key
case M.lookup key keys of
Nothing -> do -- no other refs with this label
(lab', idx) <- if T.null rawkey ||
T.length rawkey > 999 ||
T.any (\c -> c == '[' || c == ']') rawkey
then do
i <- getNextIndex
return (tshow i, i)
else
return (render Nothing label, 0)
modify (\s -> s{
stRefs = (lab', target, attr) : refs,
stKeys = M.insert (getKey label)
(M.insert (target, attr) idx mempty)
(stKeys s) })
return lab'
Just km -> -- we have refs with this label
case M.lookup (target, attr) km of
Just i -> do
let lab' = render Nothing $
label <> if i == 0
then mempty
else literal (tshow i)
-- make sure it's in stRefs; it may be
-- a duplicate that was printed in a previous
-- block:
when ((lab', target, attr) `notElem` refs) $
modify (\s -> s{
stRefs = (lab', target, attr) : refs })
return lab'
Nothing -> do -- but this one is to a new target
i <- getNextIndex
let lab' = tshow i
modify (\s -> s{
stRefs = (lab', target, attr) : refs,
stKeys = M.insert key
(M.insert (target, attr) i km)
(stKeys s) })
return lab'
-- | Convert list of Pandoc inline elements to markdown.
inlineListToMarkdown :: PandocMonad m => WriterOptions -> [Inline] -> MD m (Doc Text)
inlineListToMarkdown opts ils = do
inlist <- asks envInList
avoidBadWraps inlist <$> go ils
where go [] = return empty
go (x@Math{}:y@(Str t):zs)
| T.all isDigit (T.take 1 t) -- starts with digit -- see #7058
= liftM2 (<>) (inlineToMarkdown opts x)
(go (RawInline (Format "html") "<!-- -->" : y : zs))
go (i:is) = case i of
Link {} -> case is of
-- If a link is followed by another link, or '[', '(' or ':'
-- then we don't shortcut
Link {}:_ -> unshortcutable
Space:Link {}:_ -> unshortcutable
Space:(Str(thead -> Just '[')):_ -> unshortcutable
Space:(RawInline _ (thead -> Just '[')):_ -> unshortcutable
Space:(Cite _ _):_ -> unshortcutable
SoftBreak:Link {}:_ -> unshortcutable
SoftBreak:(Str(thead -> Just '[')):_ -> unshortcutable
SoftBreak:(RawInline _ (thead -> Just '[')):_ -> unshortcutable
SoftBreak:(Cite _ _):_ -> unshortcutable
LineBreak:Link {}:_ -> unshortcutable
LineBreak:(Str(thead -> Just '[')):_ -> unshortcutable
LineBreak:(RawInline _ (thead -> Just '[')):_ -> unshortcutable
LineBreak:(Cite _ _):_ -> unshortcutable
(Cite _ _):_ -> unshortcutable
Str (thead -> Just '['):_ -> unshortcutable
Str (thead -> Just '('):_ -> unshortcutable
Str (thead -> Just ':'):_ -> unshortcutable
(RawInline _ (thead -> Just '[')):_ -> unshortcutable
(RawInline _ (thead -> Just '(')):_ -> unshortcutable
(RawInline _ (thead -> Just ':')):_ -> unshortcutable
(RawInline _ (T.stripPrefix " [" -> Just _ )):_ -> unshortcutable
_ -> shortcutable
_ -> shortcutable
where shortcutable = liftM2 (<>) (inlineToMarkdown opts i) (go is)
unshortcutable = do
iMark <- local
(\env -> env { envRefShortcutable = False })
(inlineToMarkdown opts i)
fmap (iMark <>) (go is)
thead = fmap fst . T.uncons
-- Remove breaking spaces that might cause bad wraps.
avoidBadWraps :: Bool -> Doc Text -> Doc Text
avoidBadWraps inListItem = go . toList
where
go [] = mempty
go (BreakingSpace : Text len t : BreakingSpace : xs)
= case T.uncons t of
Just (c,t')
| c == '>'
|| ((c == '-' || c == '*' || c == '+') && T.null t')
|| (inListItem && isOrderedListMarker t)
|| (t == "1." || t == "1)")
-> Text (len + 1) (" " <> t) <> go (BreakingSpace : xs)
_ -> BreakingSpace <> Text len t <> go (BreakingSpace : xs)
go (x:xs) = x <> go xs
toList (Concat (Concat a b) c) = toList (Concat a (Concat b c))
toList (Concat a b) = a : toList b
toList x = [x]
isOrderedListMarker :: Text -> Bool
isOrderedListMarker xs = not (T.null xs) && (T.last xs `elem` ['.',')']) &&
isRight (runParser (anyOrderedListMarker >> eof)
defaultParserState "" xs)
where
isRight (Right _) = True
isRight (Left _) = False
-- | Convert Pandoc inline element to markdown.
inlineToMarkdown :: PandocMonad m => WriterOptions -> Inline -> MD m (Doc Text)
inlineToMarkdown opts (Span ("",["emoji"],kvs) [Str s]) =
case lookup "data-emoji" kvs of
Just emojiname | isEnabled Ext_emoji opts ->
return $ ":" <> literal emojiname <> ":"
_ -> inlineToMarkdown opts (Str s)
inlineToMarkdown opts (Span attrs ils) = do
variant <- asks envVariant
contents <- inlineListToMarkdown opts ils
return $ case attrs of
(_,["csl-block"],_) -> (cr <>)
(_,["csl-left-margin"],_) -> (cr <>)
(_,["csl-indent"],_) -> (cr <>)
_ -> id
$ case variant of
PlainText -> contents
Markua -> "`" <> contents <> "`" <> attrsToMarkua attrs
_ | attrs == nullAttr -> contents
| isEnabled Ext_bracketed_spans opts ->
let attrs' = if attrs /= nullAttr
then attrsToMarkdown attrs
else empty
in "[" <> contents <> "]" <> attrs'
| isEnabled Ext_raw_html opts ||
isEnabled Ext_native_spans opts ->
tagWithAttrs "span" attrs <> contents <> literal "</span>"
| otherwise -> contents
inlineToMarkdown _ (Emph []) = return empty
inlineToMarkdown opts (Emph lst) = do
variant <- asks envVariant
contents <- inlineListToMarkdown opts lst
return $ case variant of
PlainText
| isEnabled Ext_gutenberg opts -> "_" <> contents <> "_"
| otherwise -> contents
_ -> "*" <> contents <> "*"
inlineToMarkdown _ (Underline []) = return empty
inlineToMarkdown opts (Underline lst) = do
variant <- asks envVariant
contents <- inlineListToMarkdown opts lst
case variant of
PlainText -> return contents
_ | isEnabled Ext_bracketed_spans opts ->
return $ "[" <> contents <> "]" <> "{.underline}"
| isEnabled Ext_native_spans opts ->
return $ tagWithAttrs "span" ("", ["underline"], [])
<> contents
<> literal "</span>"
| isEnabled Ext_raw_html opts ->
return $ "<u>" <> contents <> "</u>"
| otherwise -> inlineToMarkdown opts (Emph lst)
inlineToMarkdown _ (Strong []) = return empty
inlineToMarkdown opts (Strong lst) = do
variant <- asks envVariant
case variant of
PlainText ->
inlineListToMarkdown opts $
if isEnabled Ext_gutenberg opts
then capitalize lst
else lst
_ -> do
contents <- inlineListToMarkdown opts lst
return $ "**" <> contents <> "**"
inlineToMarkdown _ (Strikeout []) = return empty
inlineToMarkdown opts (Strikeout lst) = do
contents <- inlineListToMarkdown opts lst
return $ if isEnabled Ext_strikeout opts
then "~~" <> contents <> "~~"
else if isEnabled Ext_raw_html opts
then "<s>" <> contents <> "</s>"
else contents
inlineToMarkdown _ (Superscript []) = return empty
inlineToMarkdown opts (Superscript lst) =
local (\env -> env {envEscapeSpaces = envVariant env == Markdown}) $ do
contents <- inlineListToMarkdown opts lst
if isEnabled Ext_superscript opts
then return $ "^" <> contents <> "^"
else if isEnabled Ext_raw_html opts
then return $ "<sup>" <> contents <> "</sup>"
else
case traverse toSuperscriptInline lst of
Just xs' | not (writerPreferAscii opts)
-> inlineListToMarkdown opts xs'
_ -> do
let rendered = render Nothing contents
return $
case mapM toSuperscript (T.unpack rendered) of
Just r -> literal $ T.pack r
Nothing -> literal $ "^(" <> rendered <> ")"
inlineToMarkdown _ (Subscript []) = return empty
inlineToMarkdown opts (Subscript lst) =
local (\env -> env {envEscapeSpaces = envVariant env == Markdown}) $ do
contents <- inlineListToMarkdown opts lst
if isEnabled Ext_subscript opts
then return $ "~" <> contents <> "~"
else if isEnabled Ext_raw_html opts
then return $ "<sub>" <> contents <> "</sub>"
else
case traverse toSubscriptInline lst of
Just xs' | not (writerPreferAscii opts)
-> inlineListToMarkdown opts xs'
_ -> do
let rendered = render Nothing contents
return $
case mapM toSuperscript (T.unpack rendered) of
Just r -> literal $ T.pack r
Nothing -> literal $ "_(" <> rendered <> ")"
inlineToMarkdown opts (SmallCaps lst) = do
variant <- asks envVariant
if variant /= PlainText &&
(isEnabled Ext_raw_html opts || isEnabled Ext_native_spans opts)
then inlineToMarkdown opts (Span ("",["smallcaps"],[]) lst)
else inlineListToMarkdown opts $ capitalize lst
inlineToMarkdown opts (Quoted SingleQuote lst) = do
contents <- inlineListToMarkdown opts lst
return $ if isEnabled Ext_smart opts
then "'" <> contents <> "'"
else
if writerPreferAscii opts
then "‘" <> contents <> "’"
else "‘" <> contents <> "’"
inlineToMarkdown opts (Quoted DoubleQuote lst) = do
contents <- inlineListToMarkdown opts lst
return $ if isEnabled Ext_smart opts
then "\"" <> contents <> "\""
else
if writerPreferAscii opts
then "“" <> contents <> "”"
else "“" <> contents <> "”"
inlineToMarkdown opts (Code attr str) = do
variant <- asks envVariant
let tickGroups = filter (T.any (== '`')) $ T.group str
let longest = maybe 0 maximum $ nonEmpty $ map T.length tickGroups
let marker = T.replicate (longest + 1) "`"
let spacer = if longest == 0 then "" else " "
let attrsEnabled = isEnabled Ext_inline_code_attributes opts ||
isEnabled Ext_attributes opts
let attrs = case variant of
Markua -> attrsToMarkua attr
_ -> if attrsEnabled && attr /= nullAttr
then attrsToMarkdown attr
else empty
case variant of
PlainText -> return $ literal str
_ -> return $ literal
(marker <> spacer <> str <> spacer <> marker) <> attrs
inlineToMarkdown opts (Str str) = do
variant <- asks envVariant
let str' = case variant of
Markua -> escapeMarkuaString str
_ -> (if writerPreferAscii opts
then toHtml5Entities
else id) .
(if isEnabled Ext_smart opts
then unsmartify opts
else id) .
(if variant == PlainText
then id
else escapeText opts) $ str
return $ literal str'
inlineToMarkdown opts (Math InlineMath str) = do
variant <- asks envVariant
case () of
_ | variant == Markua -> return $ "`" <> literal str <> "`" <> "$"
| otherwise -> case writerHTMLMathMethod opts of
WebTeX url ->
let str' = T.strip str
in inlineToMarkdown opts
(Image nullAttr [Str str'] (url <> urlEncode str', str'))
_ | isEnabled Ext_tex_math_dollars opts ->
return $ "$" <> literal str <> "$"
| isEnabled Ext_tex_math_single_backslash opts ->
return $ "\\(" <> literal str <> "\\)"
| isEnabled Ext_tex_math_double_backslash opts ->
return $ "\\\\(" <> literal str <> "\\\\)"
| otherwise ->
texMathToInlines InlineMath str >>=
inlineListToMarkdown opts .
(if variant == PlainText then makeMathPlainer else id)
inlineToMarkdown opts (Math DisplayMath str) = do
variant <- asks envVariant
case () of
_ | variant == Markua -> do
let attributes = attrsToMarkua (addKeyValueToAttr ("",[],[])
("format", "latex"))
return $ blankline <> attributes <> cr <> literal "```" <> cr
<> literal str <> cr <> literal "```" <> blankline
| otherwise -> case writerHTMLMathMethod opts of
WebTeX url ->
let str' = T.strip str
in (\x -> blankline <> x <> blankline) `fmap`
inlineToMarkdown opts (Image nullAttr [Str str']
(url <> urlEncode str', str'))
_ | isEnabled Ext_tex_math_dollars opts ->
return $ "$$" <> literal str <> "$$"
| isEnabled Ext_tex_math_single_backslash opts ->
return $ "\\[" <> literal str <> "\\]"
| isEnabled Ext_tex_math_double_backslash opts ->
return $ "\\\\[" <> literal str <> "\\\\]"
| otherwise -> (\x -> cr <> x <> cr) `fmap`
(texMathToInlines DisplayMath str >>= inlineListToMarkdown opts)
inlineToMarkdown opts il@(RawInline f str) = do
let tickGroups = filter (T.any (== '`')) $ T.group str
let numticks = 1 + maybe 0 maximum (nonEmpty (map T.length tickGroups))
variant <- asks envVariant
let Format fmt = f
let rawAttribInline = return $
literal (T.replicate numticks "`") <> literal str <>
literal (T.replicate numticks "`") <> literal "{=" <> literal fmt <> literal "}"
let renderEmpty = mempty <$ report (InlineNotRendered il)
case variant of
PlainText
| f == "plain" -> return $ literal str
Commonmark
| f `elem` ["gfm", "commonmark", "commonmark_x", "markdown"]
-> return $ literal str
Markdown
| f `elem` ["markdown", "markdown_github", "markdown_phpextra",
"markdown_mmd", "markdown_strict"]
-> return $ literal str
Markua -> renderEmpty
_ | isEnabled Ext_raw_attribute opts -> rawAttribInline
| f `elem` ["html", "html5", "html4"]
, isEnabled Ext_raw_html opts
-> return $ literal str
| f `elem` ["latex", "tex"]
, isEnabled Ext_raw_tex opts
-> return $ literal str
_ -> renderEmpty
inlineToMarkdown opts LineBreak = do
variant <- asks envVariant
if variant == PlainText || isEnabled Ext_hard_line_breaks opts
then return cr
else return $
if isEnabled Ext_escaped_line_breaks opts
then "\\" <> cr
else " " <> cr
inlineToMarkdown _ Space = do
escapeSpaces <- asks envEscapeSpaces
return $ if escapeSpaces then "\\ " else space
inlineToMarkdown opts SoftBreak = do
escapeSpaces <- asks envEscapeSpaces
let space' = if escapeSpaces then "\\ " else space
return $ case writerWrapText opts of
WrapNone -> space'
WrapAuto -> space'
WrapPreserve -> cr
inlineToMarkdown opts (Cite [] lst) = inlineListToMarkdown opts lst
inlineToMarkdown opts (Cite (c:cs) lst)
| not (isEnabled Ext_citations opts) = inlineListToMarkdown opts lst
| otherwise =
if citationMode c == AuthorInText
then do
suffs <- inlineListToMarkdown opts $ citationSuffix c
rest <- mapM convertOne cs
let inbr = suffs <>
(if not (null (citationSuffix c)) && not (null rest)
then text ";"
else mempty)
<+> joincits rest
br = if isEmpty inbr then empty else char '[' <> inbr <> char ']'
return $ literal ("@" <> maybeInBraces (citationId c)) <+> br
else do
cits <- mapM convertOne (c:cs)
return $ literal "[" <> joincits cits <> literal "]"
where
maybeInBraces key =
case readWith (citeKey False >> spaces >> eof)
defaultParserState ("@" <> key) of
Left _ -> "{" <> key <> "}"
Right _ -> key
joincits = hcat . intersperse (literal "; ") . filter (not . isEmpty)
convertOne Citation { citationId = k
, citationPrefix = pinlines
, citationSuffix = sinlines
, citationMode = m }
= do
pdoc <- inlineListToMarkdown opts pinlines
sdoc <- inlineListToMarkdown opts sinlines
let k' = literal (modekey m <> "@" <> maybeInBraces k)
r = case sinlines of
Str (T.uncons -> Just (y,_)):_
| y `elem` (",;]@" :: String) -> k' <> sdoc
Space:_ -> k' <> sdoc
_ -> k' <+> sdoc
return $ pdoc <+> r
modekey SuppressAuthor = "-"
modekey _ = ""
inlineToMarkdown opts lnk@(Link attr@(ident,classes,kvs) txt (src, tit)) = do
variant <- asks envVariant
linktext <- inlineListToMarkdown opts txt
let linktitle = if T.null tit
then empty
else literal $ " \"" <> tit <> "\""
let srcSuffix = fromMaybe src (T.stripPrefix "mailto:" src)
let useAuto = isURI src &&
T.null ident &&
null kvs &&
(null classes || classes == ["uri"] || classes == ["email"]) &&
case txt of
[Str s] | escapeURI s == srcSuffix -> True
_ -> False
let useRefLinks = writerReferenceLinks opts && not useAuto
shortcutable <- asks envRefShortcutable
let useShortcutRefLinks = shortcutable &&
isEnabled Ext_shortcut_reference_links opts
reftext <- if useRefLinks
then literal <$> getReference attr linktext (src, tit)
else return mempty
case variant of
PlainText
| useAuto -> return $ literal srcSuffix
| otherwise -> return linktext
Markua
| T.null tit -> return $ result <> attrsToMarkua attr
| otherwise -> return $ result <> attrsToMarkua attributes
where result = "[" <> linktext <> "](" <> (literal src) <> ")"
attributes = addKeyValueToAttr attr ("title", tit)
_ | useAuto -> return $ "<" <> literal srcSuffix <> ">"
| useRefLinks ->
let first = "[" <> linktext <> "]"
second = if getKey linktext == getKey reftext
then if useShortcutRefLinks
then ""
else "[]"
else "[" <> reftext <> "]"
in return $ first <> second
| isEnabled Ext_raw_html opts
, not (isEnabled Ext_link_attributes opts || isEnabled Ext_attributes opts)
, attr /= nullAttr -> -- use raw HTML to render attributes
literal . T.strip <$>
writeHtml5String opts{ writerTemplate = Nothing }
(Pandoc nullMeta [Plain [lnk]])
| otherwise -> return $
"[" <> linktext <> "](" <> literal src <> linktitle <> ")" <>
linkAttributes opts attr
inlineToMarkdown opts img@(Image attr alternate (source, tit))
| isEnabled Ext_raw_html opts &&
not (isEnabled Ext_link_attributes opts || isEnabled Ext_attributes opts) &&
attr /= nullAttr = -- use raw HTML
literal . T.strip <$>
writeHtml5String opts{ writerTemplate = Nothing } (Pandoc nullMeta [Plain [img]])
| otherwise = do
variant <- asks envVariant
let txt = if null alternate || alternate == [Str source]
-- to prevent autolinks
then [Str ""]
else alternate
linkPart <- inlineToMarkdown opts (Link attr txt (source, tit))
alt <- inlineListToMarkdown opts alternate
let attributes | variant == Markua = attrsToMarkua $
addKeyValueToAttr (addKeyValueToAttr attr ("title", tit))
("alt", render (Just (writerColumns opts)) alt)
| otherwise = empty
return $ case variant of
PlainText -> "[" <> linkPart <> "]"
Markua -> cr <> attributes <> cr <> literal "![](" <>
literal source <> ")" <> cr
_ -> "!" <> linkPart
inlineToMarkdown opts (Note contents) = do
modify (\st -> st{ stNotes = contents : stNotes st })
st <- get
let ref = literal $ writerIdentifierPrefix opts <> tshow (stNoteNum st + length (stNotes st) - 1)
if isEnabled Ext_footnotes opts
then return $ "[^" <> ref <> "]"
else return $ "[" <> ref <> "]"
makeMathPlainer :: [Inline] -> [Inline]
makeMathPlainer = walk go
where
go (Emph xs) = Span nullAttr xs
go x = x
toSubscriptInline :: Inline -> Maybe Inline
toSubscriptInline Space = Just Space
toSubscriptInline (Span attr ils) = Span attr <$> traverse toSubscriptInline ils
toSubscriptInline (Str s) = Str . T.pack <$> traverse toSubscript (T.unpack s)
toSubscriptInline LineBreak = Just LineBreak
toSubscriptInline SoftBreak = Just SoftBreak
toSubscriptInline _ = Nothing
toSuperscriptInline :: Inline -> Maybe Inline
toSuperscriptInline Space = Just Space
toSuperscriptInline (Span attr ils) = Span attr <$> traverse toSuperscriptInline ils
toSuperscriptInline (Str s) = Str . T.pack <$> traverse toSuperscript (T.unpack s)
toSuperscriptInline LineBreak = Just LineBreak
toSuperscriptInline SoftBreak = Just SoftBreak
toSuperscriptInline _ = Nothing