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|
{-
Copyright (C) 2006 John MacFarlane <jgm at berkeley dot 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.Readers.Markdown
Copyright : Copyright (C) 2006 John MacFarlane
License : GNU GPL, version 2 or above
Maintainer : John MacFarlane <jgm at berkeley dot edu>
Stability : alpha
Portability : portable
Conversion of markdown-formatted plain text to 'Pandoc' document.
-}
module Text.Pandoc.Readers.Markdown (
readMarkdown
) where
import Data.List ( findIndex, sortBy )
import Text.ParserCombinators.Pandoc
import Text.Pandoc.Definition
import Text.Pandoc.Readers.LaTeX ( rawLaTeXInline, rawLaTeXEnvironment )
import Text.Pandoc.Shared
import Text.Pandoc.Readers.HTML ( rawHtmlBlock,
anyHtmlBlockTag, anyHtmlInlineTag,
anyHtmlTag, anyHtmlEndTag,
htmlEndTag, extractTagType,
htmlBlockElement )
import Text.Pandoc.Entities ( decodeEntities )
import Text.Regex ( matchRegex, mkRegex )
import Text.ParserCombinators.Parsec
-- | Read markdown from an input string and return a Pandoc document.
readMarkdown :: ParserState -> String -> Pandoc
readMarkdown = readWith parseMarkdown
-- | Parse markdown string with default options and print result (for testing).
testString :: String -> IO ()
testString = testStringWith parseMarkdown
--
-- Constants and data structure definitions
--
spaceChars = " \t"
endLineChars = "\n"
labelStart = '['
labelEnd = ']'
labelSep = ':'
srcStart = '('
srcEnd = ')'
imageStart = '!'
noteStart = '^'
codeStart = '`'
codeEnd = '`'
emphStart = '*'
emphEnd = '*'
emphStartAlt = '_'
emphEndAlt = '_'
autoLinkStart = '<'
autoLinkEnd = '>'
mathStart = '$'
mathEnd = '$'
bulletListMarkers = "*+-"
orderedListDelimiters = ".)"
escapeChar = '\\'
hruleChars = "*-_"
quoteChars = "'\""
atxHChar = '#'
titleOpeners = "\"'("
setextHChars = ['=','-']
blockQuoteChar = '>'
hyphenChar = '-'
ellipsesChar = '.'
-- treat these as potentially non-text when parsing inline:
specialChars = [escapeChar, labelStart, labelEnd, emphStart, emphEnd,
emphStartAlt, emphEndAlt, codeStart, codeEnd, autoLinkEnd,
autoLinkStart, mathStart, mathEnd, imageStart, noteStart,
hyphenChar, ellipsesChar] ++ quoteChars
--
-- auxiliary functions
--
-- | Skip a single endline if there is one.
skipEndline = option Space endline
indentSpaces = do
state <- getState
let tabStop = stateTabStop state
oneOfStrings [ "\t", (replicate tabStop ' ') ] <?> "indentation"
skipNonindentSpaces = do
state <- getState
let tabStop = stateTabStop state
choice (map (\n -> (try (count n (char ' ')))) (reverse [0..(tabStop - 1)]))
-- | Fail if reader is in strict markdown syntax mode.
failIfStrict = do
state <- getState
if stateStrict state then fail "Strict markdown mode" else return ()
-- | Fail unless we're at beginning of a line.
failUnlessBeginningOfLine = do
pos <- getPosition
if sourceColumn pos == 1 then return () else fail "not beginning of line"
-- | Fail unless we're in "smart typography" mode.
failUnlessSmart = do
state <- getState
if stateSmart state then return () else fail "Smart typography feature"
--
-- document structure
--
titleLine = try (do
char '%'
skipSpaces
line <- manyTill inline newline
return line)
authorsLine = try (do
char '%'
skipSpaces
authors <- sepEndBy (many1 (noneOf ",;\n")) (oneOf ",;")
newline
return (map removeLeadingTrailingSpace authors))
dateLine = try (do
char '%'
skipSpaces
date <- many (noneOf "\n")
newline
return (removeTrailingSpace date))
titleBlock = try (do
failIfStrict
title <- option [] titleLine
author <- option [] authorsLine
date <- option "" dateLine
option "" blanklines
return (title, author, date))
-- | Returns the number assigned to a Note block
numberOfNote :: Block -> Int
numberOfNote (Note ref _) = (read ref)
numberOfNote _ = 0
parseMarkdown = do
updateState (\state -> state { stateParseRaw = True })
-- need to parse raw HTML, since markdown allows it
(title, author, date) <- option ([],[],"") titleBlock
oldState <- getState
oldInput <- getInput
-- go through once just to get list of reference keys
manyTill (referenceKey <|> (do{anyLine; return Null})) eof
newState <- getState
let keysUsed = stateKeysUsed newState
setInput oldInput
setState (oldState { stateKeysUsed = keysUsed })
blocks <- parseBlocks -- go through again, for real
let blocks' = filter (/= Null) blocks
state <- getState
let keys = reverse $ stateKeyBlocks state
let notes = reverse $ stateNoteBlocks state
let sortedNotes = sortBy (\x y -> compare (numberOfNote x)
(numberOfNote y)) notes
return (Pandoc (Meta title author date) (blocks' ++ sortedNotes ++ keys))
--
-- parsing blocks
--
parseBlocks = manyTill block eof
block = choice [ codeBlock, note, referenceKey, header, hrule, list,
blockQuote, htmlBlock, rawLaTeXEnvironment', para,
plain, blankBlock, nullBlock ] <?> "block"
--
-- header blocks
--
header = choice [ setextHeader, atxHeader ] <?> "header"
atxHeader = try (do
lead <- many1 (char atxHChar)
skipSpaces
txt <- manyTill inline atxClosing
return (Header (length lead) (normalizeSpaces txt)))
atxClosing = try (do
skipMany (char atxHChar)
skipSpaces
newline
option "" blanklines)
setextHeader = choice $
map (\x -> setextH x) (enumFromTo 1 (length setextHChars))
setextH n = try (do
txt <- many1Till inline newline
many1 (char (setextHChars !! (n-1)))
skipSpaces
newline
option "" blanklines
return (Header n (normalizeSpaces txt)))
--
-- hrule block
--
hruleWith chr = try (do
skipSpaces
char chr
skipSpaces
char chr
skipSpaces
char chr
skipMany (oneOf (chr:spaceChars))
newline
option "" blanklines
return HorizontalRule)
hrule = choice (map hruleWith hruleChars) <?> "hrule"
--
-- code blocks
--
indentedLine = try (do
indentSpaces
result <- manyTill anyChar newline
return (result ++ "\n"))
-- two or more indented lines, possibly separated by blank lines
indentedBlock = try (do
res1 <- indentedLine
blanks <- many blankline
res2 <- choice [indentedBlock, indentedLine]
return (res1 ++ blanks ++ res2))
codeBlock = do
result <- choice [indentedBlock, indentedLine]
option "" blanklines
return (CodeBlock (stripTrailingNewlines result))
--
-- note block
--
rawLine = try (do
notFollowedBy' blankline
notFollowedBy' noteMarker
contents <- many1 nonEndline
end <- option "" (do
newline
option "" indentSpaces
return "\n")
return (contents ++ end))
rawLines = do
lines <- many1 rawLine
return (concat lines)
note = try (do
failIfStrict
ref <- noteMarker
char ':'
skipSpaces
skipEndline
raw <- sepBy rawLines (try (do {blankline; indentSpaces}))
option "" blanklines
-- parse the extracted text, which may contain various block elements:
rest <- getInput
setInput $ (joinWithSep "\n" raw) ++ "\n\n"
contents <- parseBlocks
setInput rest
state <- getState
let identifiers = stateNoteIdentifiers state
case (findIndex (== ref) identifiers) of
Just n -> updateState (\s -> s {stateNoteBlocks =
(Note (show (n+1)) contents):(stateNoteBlocks s)})
Nothing -> updateState id
return Null)
--
-- block quotes
--
emacsBoxQuote = try (do
failIfStrict
string ",----"
manyTill anyChar newline
raw <- manyTill (try (do
char '|'
option ' ' (char ' ')
result <- manyTill anyChar newline
return result))
(string "`----")
manyTill anyChar newline
option "" blanklines
return raw)
emailBlockQuoteStart = try (do
skipNonindentSpaces
char blockQuoteChar
option ' ' (char ' ')
return "> ")
emailBlockQuote = try (do
emailBlockQuoteStart
raw <- sepBy (many (choice [nonEndline,
(try (do
endline
notFollowedBy' emailBlockQuoteStart
return '\n'))]))
(try (do {newline; emailBlockQuoteStart}))
newline <|> (do{ eof; return '\n' })
option "" blanklines
return raw)
blockQuote = do
raw <- choice [ emailBlockQuote, emacsBoxQuote ]
-- parse the extracted block, which may contain various block elements:
rest <- getInput
setInput $ (joinWithSep "\n" raw) ++ "\n\n"
contents <- parseBlocks
setInput rest
return (BlockQuote contents)
--
-- list blocks
--
list = choice [ bulletList, orderedList ] <?> "list"
bulletListStart = try (do
option ' ' newline -- if preceded by a Plain block in a list context
skipNonindentSpaces
notFollowedBy' hrule -- because hrules start out just like lists
oneOf bulletListMarkers
spaceChar
skipSpaces)
orderedListStart = try (do
option ' ' newline -- if preceded by a Plain block in a list context
skipNonindentSpaces
many1 digit <|> (do{failIfStrict; count 1 letter})
delim <- oneOf orderedListDelimiters
if delim /= '.' then failIfStrict else return ()
oneOf spaceChars
skipSpaces)
-- parse a line of a list item (start = parser for beginning of list item)
listLine start = try (do
notFollowedBy' start
notFollowedBy blankline
notFollowedBy' (do
indentSpaces
many (spaceChar)
choice [bulletListStart, orderedListStart])
line <- manyTill anyChar newline
return (line ++ "\n"))
-- parse raw text for one list item, excluding start marker and continuations
rawListItem start = try (do
start
result <- many1 (listLine start)
blanks <- many blankline
return ((concat result) ++ blanks))
-- continuation of a list item - indented and separated by blankline
-- or (in compact lists) endline.
-- note: nested lists are parsed as continuations
listContinuation start = try (do
followedBy' indentSpaces
result <- many1 (listContinuationLine start)
blanks <- many blankline
return ((concat result) ++ blanks))
listContinuationLine start = try (do
notFollowedBy' blankline
notFollowedBy' start
option "" indentSpaces
result <- manyTill anyChar newline
return (result ++ "\n"))
listItem start = try (do
first <- rawListItem start
continuations <- many (listContinuation start)
-- parsing with ListItemState forces markers at beginning of lines to
-- count as list item markers, even if not separated by blank space.
-- see definition of "endline"
state <- getState
let oldContext = stateParserContext state
setState $ state {stateParserContext = ListItemState}
-- parse the extracted block, which may contain various block elements:
rest <- getInput
let raw = concat (first:continuations)
setInput $ raw
contents <- parseBlocks
setInput rest
updateState (\st -> st {stateParserContext = oldContext})
return contents)
orderedList = try (do
items <- many1 (listItem orderedListStart)
let items' = compactify items
return (OrderedList items'))
bulletList = try (do
items <- many1 (listItem bulletListStart)
let items' = compactify items
return (BulletList items'))
--
-- paragraph block
--
para = try (do
result <- many1 inline
newline
st <- getState
if stateStrict st
then choice [followedBy' blockQuote, followedBy' header,
(do{blanklines; return ()})]
else choice [followedBy' emacsBoxQuote,
(do{blanklines; return ()})]
let result' = normalizeSpaces result
return (Para result'))
plain = do
result <- many1 inline
let result' = normalizeSpaces result
return (Plain result')
--
-- raw html
--
htmlElement = choice [strictHtmlBlock,
htmlBlockElement] <?> "html element"
htmlBlock = do
st <- getState
if stateStrict st
then do
failUnlessBeginningOfLine
first <- htmlElement
finalSpace <- many (oneOf spaceChars)
finalNewlines <- many newline
return (RawHtml (first ++ finalSpace ++ finalNewlines))
else rawHtmlBlocks
-- True if tag is self-closing
selfClosing tag = case (matchRegex (mkRegex "\\/[[:space:]]*>$") tag) of
Just _ -> True
Nothing -> False
strictHtmlBlock = try (do
tag <- anyHtmlBlockTag
let tag' = extractTagType tag
if selfClosing tag || tag' == "hr"
then return tag
else do
contents <- many (do{notFollowedBy' (htmlEndTag tag');
htmlElement <|> (count 1 anyChar)})
end <- htmlEndTag tag'
return $ tag ++ (concat contents) ++ end)
rawHtmlBlocks = try (do
htmlBlocks <- many1 rawHtmlBlock
let combined = concatMap (\(RawHtml str) -> str) htmlBlocks
let combined' = if (last combined == '\n')
then init combined -- strip extra newline
else combined
return (RawHtml combined'))
--
-- reference key
--
referenceKey = try (do
skipNonindentSpaces
label <- reference
char labelSep
skipSpaces
option ' ' (char autoLinkStart)
src <- many (noneOf (titleOpeners ++ [autoLinkEnd] ++ endLineChars))
option ' ' (char autoLinkEnd)
tit <- option "" title
blanklines
state <- getState
let keysUsed = stateKeysUsed state
updateState (\st -> st { stateKeysUsed = (label:keysUsed) })
return $ Key label (Src (removeTrailingSpace src) tit))
--
-- LaTeX
--
rawLaTeXEnvironment' = do
failIfStrict
rawLaTeXEnvironment
--
-- inline
--
text = choice [ escapedChar, math, strong, emph, smartPunctuation,
code, ltSign, symbol,
str, linebreak, tabchar, whitespace, endline ] <?> "text"
inline = choice [ rawLaTeXInline', escapedChar, special, text ] <?> "inline"
special = choice [ noteRef, inlineNote, link, referenceLink, rawHtmlInline',
autoLink, image ] <?> "link, inline html, note, or image"
escapedChar = escaped anyChar
ltSign = try (do
notFollowedBy (noneOf "<") -- continue only if it's a <
notFollowedBy' rawHtmlBlocks -- don't return < if it starts html
char '<'
return (Str ['<']))
specialCharsMinusLt = filter (/= '<') specialChars
symbol = do
result <- oneOf specialCharsMinusLt
return (Str [result])
-- parses inline code, between n codeStarts and n codeEnds
code = try (do
starts <- many1 (char codeStart)
let num = length starts
result <- many1Till anyChar (try (count num (char codeEnd)))
-- get rid of any internal newlines
let result' = removeLeadingTrailingSpace $ joinWithSep " " $ lines result
return (Code result'))
mathWord = many1 (choice [ (noneOf (" \t\n\\" ++ [mathEnd])),
(try (do
c <- char '\\'
notFollowedBy (char mathEnd)
return c))])
math = try (do
failIfStrict
char mathStart
notFollowedBy space
words <- sepBy1 mathWord (many1 space)
char mathEnd
return (TeX ("$" ++ (joinWithSep " " words) ++ "$")))
emph = do
result <- choice [ (enclosed (char emphStart) (char emphEnd) inline),
(enclosed (char emphStartAlt) (char emphEndAlt) inline) ]
return (Emph (normalizeSpaces result))
strong = do
result <- choice [ (enclosed (count 2 (char emphStart))
(count 2 (char emphEnd)) inline),
(enclosed (count 2 (char emphStartAlt))
(count 2 (char emphEndAlt)) inline) ]
return (Strong (normalizeSpaces result))
smartPunctuation = do
failUnlessSmart
choice [ quoted, apostrophe, dash, ellipses ]
apostrophe = do
char '\'' <|> char '\8217'
return Apostrophe
quoted = do
doubleQuoted <|> singleQuoted
withQuoteContext context parser = do
oldState <- getState
let oldQuoteContext = stateQuoteContext oldState
setState oldState { stateQuoteContext = context }
result <- parser
newState <- getState
setState newState { stateQuoteContext = oldQuoteContext }
return result
singleQuoted = try $ do
singleQuoteStart
withQuoteContext InSingleQuote $ do
notFollowedBy space
result <- many1Till inline singleQuoteEnd
return $ Quoted SingleQuote $ normalizeSpaces result
doubleQuoted = try $ do
doubleQuoteStart
withQuoteContext InDoubleQuote $ do
notFollowedBy space
result <- many1Till inline doubleQuoteEnd
return $ Quoted DoubleQuote $ normalizeSpaces result
failIfInQuoteContext context = do
st <- getState
if (stateQuoteContext st == context)
then fail "already inside quotes"
else return ()
singleQuoteStart = do
failIfInQuoteContext InSingleQuote
char '\'' <|> char '\8216'
singleQuoteEnd = try (do
char '\'' <|> char '\8217'
notFollowedBy alphaNum)
doubleQuoteStart = do
failIfInQuoteContext InDoubleQuote
char '"' <|> char '\8220'
doubleQuoteEnd = char '"' <|> char '\8221'
ellipses = try (do
oneOfStrings ["...", " . . . ", ". . .", " . . ."]
return Ellipses)
dash = enDash <|> emDash
enDash = try (do
char '-'
notFollowedBy (noneOf "0123456789")
return EnDash)
emDash = try (do
skipSpaces
oneOfStrings ["---", "--"]
skipSpaces
option ' ' newline
return EmDash)
whitespace = do
many1 (oneOf spaceChars) <?> "whitespace"
return Space
tabchar = do
tab
return (Str "\t")
-- hard line break
linebreak = try (do
oneOf spaceChars
many1 (oneOf spaceChars)
endline
return LineBreak )
nonEndline = noneOf endLineChars
str = do
result <- many1 ((noneOf (specialChars ++ spaceChars ++ endLineChars)))
return (Str (decodeEntities result))
-- an endline character that can be treated as a space, not a structural break
endline = try (do
newline
notFollowedBy blankline
st <- getState
if stateStrict st
then do
notFollowedBy' emailBlockQuoteStart
notFollowedBy' header
else return ()
-- parse potential list-starts differently if in a list:
if (stateParserContext st) == ListItemState
then notFollowedBy' (orderedListStart <|> bulletListStart)
else return ()
return Space)
--
-- links
--
-- a reference label for a link
reference = do
char labelStart
notFollowedBy (char noteStart)
-- allow for embedded brackets:
label <- manyTill ((do{res <- reference;
return $ [Str "["] ++ res ++ [Str "]"]}) <|>
count 1 inline)
(char labelEnd)
return (normalizeSpaces (concat label))
-- source for a link, with optional title
source = try (do
char srcStart
option ' ' (char autoLinkStart)
src <- many (noneOf ([srcEnd, autoLinkEnd] ++ titleOpeners))
option ' ' (char autoLinkEnd)
tit <- option "" title
skipSpaces
char srcEnd
return (Src (removeTrailingSpace src) tit))
titleWith startChar endChar = try (do
skipSpaces
skipEndline -- a title can be on the next line from the source
skipSpaces
char startChar
tit <- manyTill anyChar (try (do
char endChar
skipSpaces
followedBy' (char ')' <|> newline)))
let tit' = gsub "\"" """ tit
return tit')
title = choice [ titleWith '(' ')',
titleWith '"' '"',
titleWith '\'' '\''] <?> "title"
link = choice [explicitLink, referenceLink] <?> "link"
explicitLink = try (do
label <- reference
src <- source
return (Link label src))
referenceLink = choice [referenceLinkDouble, referenceLinkSingle]
-- a link like [this][ref]
referenceLinkDouble = try (do
label <- reference
skipSpaces
skipEndline
skipSpaces
ref <- reference
let ref' = if null ref then label else ref
state <- getState
if ref' `elem` (stateKeysUsed state)
then return () else fail "no corresponding key"
return (Link label (Ref ref')))
-- a link like [this]
referenceLinkSingle = try (do
label <- reference
state <- getState
if label `elem` (stateKeysUsed state)
then return () else fail "no corresponding key"
return (Link label (Ref label)))
-- a link <like.this.com>
autoLink = try (do
notFollowedBy' anyHtmlBlockTag
src <- between (char autoLinkStart) (char autoLinkEnd)
(many (noneOf (spaceChars ++ endLineChars ++ [autoLinkEnd])))
case (matchRegex emailAddress src) of
Just _ -> return (Link [Str src] (Src ("mailto:" ++ src) ""))
Nothing -> return (Link [Str src] (Src src "")))
emailAddress =
mkRegex "([^@:/]+)@(([^.]+[.]?)*([^.]+))" -- presupposes no whitespace
image = try (do
char imageStart
(Link label src) <- link
return (Image label src))
noteMarker = try (do
char labelStart
char noteStart
manyTill (noneOf " \t\n") (char labelEnd))
noteRef = try (do
failIfStrict
ref <- noteMarker
state <- getState
let identifiers = (stateNoteIdentifiers state) ++ [ref]
updateState (\st -> st {stateNoteIdentifiers = identifiers})
return (NoteRef (show (length identifiers))))
inlineNote = try (do
failIfStrict
char noteStart
char labelStart
contents <- manyTill inline (char labelEnd)
state <- getState
let identifiers = stateNoteIdentifiers state
let ref = show $ (length identifiers) + 1
let noteBlocks = stateNoteBlocks state
updateState (\st -> st {stateNoteIdentifiers = (identifiers ++ [ref]),
stateNoteBlocks =
(Note ref [Para contents]):noteBlocks})
return (NoteRef ref))
rawLaTeXInline' = do
failIfStrict
rawLaTeXInline
rawHtmlInline' = do
st <- getState
result <- if stateStrict st
then choice [htmlBlockElement, anyHtmlTag, anyHtmlEndTag]
else choice [htmlBlockElement, anyHtmlInlineTag]
return (HtmlInline result)
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