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{-
Copyright (C) 2015 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.Readers.CommonMark
Copyright : Copyright (C) 2015 John MacFarlane
License : GNU GPL, version 2 or above
Maintainer : John MacFarlane <jgm@berkeley.edu>
Stability : alpha
Portability : portable
Conversion of CommonMark-formatted plain text to 'Pandoc' document.
CommonMark is a strongly specified variant of Markdown: http://commonmark.org.
-}
module Text.Pandoc.Readers.CommonMark (readCommonMark)
where
import CMark
import Data.Text (unpack, pack)
import Data.List (groupBy)
import Text.Pandoc.Definition
import Text.Pandoc.Options
import Text.Pandoc.Error
-- | Parse a CommonMark formatted string into a 'Pandoc' structure.
readCommonMark :: ReaderOptions -> String -> Either PandocError Pandoc
readCommonMark opts = Right . nodeToPandoc . commonmarkToNode opts' . pack
where opts' = if readerSmart opts
then [optNormalize, optSmart]
else [optNormalize]
nodeToPandoc :: Node -> Pandoc
nodeToPandoc (Node _ DOCUMENT nodes) =
Pandoc nullMeta $ foldr addBlock [] nodes
nodeToPandoc n = -- shouldn't happen
Pandoc nullMeta $ foldr addBlock [] [n]
addBlocks :: [Node] -> [Block]
addBlocks = foldr addBlock []
addBlock :: Node -> [Block] -> [Block]
addBlock (Node _ PARAGRAPH nodes) =
(Para (addInlines nodes) :)
addBlock (Node _ HRULE _) =
(HorizontalRule :)
addBlock (Node _ BLOCK_QUOTE nodes) =
(BlockQuote (addBlocks nodes) :)
addBlock (Node _ (HTML t) _) =
(RawBlock (Format "html") (unpack t) :)
addBlock (Node _ (CODE_BLOCK info t) _) =
(CodeBlock ("", take 1 (words (unpack info)), []) (unpack t) :)
addBlock (Node _ (HEADER lev) nodes) =
(Header lev ("",[],[]) (addInlines nodes) :)
addBlock (Node _ (LIST listAttrs) nodes) =
(constructor (map (setTightness . addBlocks . children) nodes) :)
where constructor = case listType listAttrs of
BULLET_LIST -> BulletList
ORDERED_LIST -> OrderedList
(start, DefaultStyle, delim)
start = listStart listAttrs
setTightness = if listTight listAttrs
then map paraToPlain
else id
paraToPlain (Para xs) = Plain (xs)
paraToPlain x = x
delim = case listDelim listAttrs of
PERIOD_DELIM -> Period
PAREN_DELIM -> OneParen
addBlock (Node _ ITEM _) = id -- handled in LIST
addBlock _ = id
children :: Node -> [Node]
children (Node _ _ ns) = ns
addInlines :: [Node] -> [Inline]
addInlines = foldr addInline []
addInline :: Node -> [Inline] -> [Inline]
addInline (Node _ (TEXT t) _) = (map toinl clumps ++)
where raw = unpack t
clumps = groupBy samekind raw
samekind ' ' ' ' = True
samekind ' ' _ = False
samekind _ ' ' = False
samekind _ _ = True
toinl (' ':_) = Space
toinl xs = Str xs
addInline (Node _ LINEBREAK _) = (LineBreak :)
addInline (Node _ SOFTBREAK _) = (Space :)
addInline (Node _ (INLINE_HTML t) _) =
(RawInline (Format "html") (unpack t) :)
addInline (Node _ (CODE t) _) =
(Code ("",[],[]) (unpack t) :)
addInline (Node _ EMPH nodes) =
(Emph (addInlines nodes) :)
addInline (Node _ STRONG nodes) =
(Strong (addInlines nodes) :)
addInline (Node _ (LINK url title) nodes) =
(Link (addInlines nodes) (unpack url, unpack title) :)
addInline (Node _ (IMAGE url title) nodes) =
(Image nullAttr (addInlines nodes) (unpack url, unpack title) :)
addInline _ = id
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