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{-
Copyright (C) 2006-7 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.RST
Copyright : Copyright (C) 2006-7 John MacFarlane
License : GNU GPL, version 2 or above
Maintainer : John MacFarlane <jgm@berkeley.edu>
Stability : alpha
Portability : portable
Conversion of 'Pandoc' documents to reStructuredText.
reStructuredText: <http://docutils.sourceforge.net/rst.html>
-}
module Text.Pandoc.Writers.RST ( writeRST) where
import Text.Pandoc.Definition
import Text.Pandoc.Shared
import Text.Pandoc.Blocks
import Data.List ( isPrefixOf, isSuffixOf, drop, intersperse )
import Text.PrettyPrint.HughesPJ hiding ( Str )
import Control.Monad.State
type Notes = [[Block]]
type Refs = KeyTable
type WriterState = (Notes, Refs, Refs) -- first Refs is links, second pictures
-- | Convert Pandoc to RST.
writeRST :: WriterOptions -> Pandoc -> String
writeRST opts document =
render $ evalState (pandocToRST opts document) ([],[],[])
-- | Return RST representation of document.
pandocToRST :: WriterOptions -> Pandoc -> State WriterState Doc
pandocToRST opts (Pandoc meta blocks) = do
let before = writerIncludeBefore opts
let after = writerIncludeAfter opts
before' = if null before then empty else text before
after' = if null after then empty else text after
metaBlock <- metaToRST opts meta
let head = if (writerStandalone opts)
then metaBlock $+$ text (writerHeader opts)
else empty
body <- blockListToRST opts blocks
(notes, _, _) <- get
notes' <- notesToRST opts (reverse notes)
(_, refs, pics) <- get -- note that the notes may contain refs
refs' <- keyTableToRST opts (reverse refs)
pics' <- pictTableToRST opts (reverse pics)
return $ head $+$ before' $+$ body $+$ notes' $+$ text "" $+$ refs' $+$
pics' $+$ after'
-- | Return RST representation of reference key table.
keyTableToRST :: WriterOptions -> KeyTable -> State WriterState Doc
keyTableToRST opts refs = mapM (keyToRST opts) refs >>= return . vcat
-- | Return RST representation of a reference key.
keyToRST :: WriterOptions
-> ([Inline], (String, String))
-> State WriterState Doc
keyToRST opts (label, (src, tit)) = do
label' <- inlineListToRST opts label
let label'' = if ':' `elem` (render label')
then char '`' <> label' <> char '`'
else label'
return $ text ".. _" <> label'' <> text ": " <> text src
-- | Return RST representation of notes.
notesToRST :: WriterOptions -> [[Block]] -> State WriterState Doc
notesToRST opts notes =
mapM (\(num, note) -> noteToRST opts num note) (zip [1..] notes) >>=
return . vcat
-- | Return RST representation of a note.
noteToRST :: WriterOptions -> Int -> [Block] -> State WriterState Doc
noteToRST opts num note = do
contents <- blockListToRST opts note
let marker = text ".. [" <> text (show num) <> text "] "
return $ hang marker 3 contents
-- | Return RST representation of picture reference table.
pictTableToRST :: WriterOptions -> KeyTable -> State WriterState Doc
pictTableToRST opts refs = mapM (pictToRST opts) refs >>= return . vcat
-- | Return RST representation of a picture substitution reference.
pictToRST :: WriterOptions
-> ([Inline], (String, String))
-> State WriterState Doc
pictToRST opts (label, (src, _)) = do
label' <- inlineListToRST opts label
return $ text ".. " <> char '|' <> label' <> char '|' <> text " image:: " <>
text src
-- | Take list of inline elements and return wrapped doc.
wrappedRST :: WriterOptions -> [Inline] -> State WriterState Doc
wrappedRST opts inlines =
mapM (wrapped (inlineListToRST opts)) (splitBy LineBreak inlines) >>=
return . vcat
-- | Escape special characters for RST.
escapeString :: String -> String
escapeString = escapeStringUsing (backslashEscapes "`\\|*_")
-- | Convert bibliographic information into RST header.
metaToRST :: WriterOptions -> Meta -> State WriterState Doc
metaToRST opts (Meta title authors date) = do
title' <- titleToRST opts title
authors' <- authorsToRST authors
date' <- dateToRST date
let toc = if writerTableOfContents opts
then text "" $+$ text ".. contents::"
else empty
return $ title' $+$ authors' $+$ date' $+$ toc
titleToRST :: WriterOptions -> [Inline] -> State WriterState Doc
titleToRST opts [] = return empty
titleToRST opts lst = do
contents <- inlineListToRST opts lst
let titleLength = length $ render contents
let border = text (replicate titleLength '=')
return $ border $+$ contents $+$ border <> text "\n"
authorsToRST :: [String] -> State WriterState Doc
authorsToRST [] = return empty
authorsToRST (first:rest) = do
rest' <- authorsToRST rest
return $ (text ":Author: " <> text first) $+$ rest'
dateToRST :: String -> State WriterState Doc
dateToRST [] = return empty
dateToRST str = return $ text ":Date: " <> text (escapeString str)
-- | Convert Pandoc block element to RST.
blockToRST :: WriterOptions -- ^ Options
-> Block -- ^ Block element
-> State WriterState Doc
blockToRST opts Null = return empty
blockToRST opts (Plain inlines) = wrappedRST opts inlines
blockToRST opts (Para [TeX str]) =
let str' = if "\n" `isSuffixOf` str then str ++ "\n" else str ++ "\n\n" in
return $ hang (text "\n.. raw:: latex\n") 3 $ vcat $ map text (lines str')
blockToRST opts (Para inlines) = do
contents <- wrappedRST opts inlines
return $ contents <> text "\n"
blockToRST opts (RawHtml str) =
let str' = if "\n" `isSuffixOf` str then str ++ "\n" else str ++ "\n\n" in
return $ hang (text "\n.. raw:: html\n") 3 $ vcat $ map text (lines str')
blockToRST opts HorizontalRule = return $ text "--------------\n"
blockToRST opts (Header level inlines) = do
contents <- inlineListToRST opts inlines
let headerLength = length $ render contents
let headerChar = if level > 5 then ' ' else "=-~^'" !! (level - 1)
let border = text $ replicate headerLength headerChar
return $ contents $+$ border <> text "\n"
blockToRST opts (CodeBlock str) = return $ (text "::\n") $+$
(nest (writerTabStop opts) $ vcat $ map text (lines str)) <> text "\n"
blockToRST opts (BlockQuote blocks) = do
contents <- blockListToRST opts blocks
return $ (nest (writerTabStop opts) contents) <> text "\n"
blockToRST opts (Table caption aligns widths headers rows) = do
caption' <- inlineListToRST opts caption
let caption'' = if null caption
then empty
else text "" $+$ (text "Table: " <> caption')
headers' <- mapM (blockListToRST opts) headers
let widthsInChars = map (floor . (78 *)) widths
let alignHeader alignment = case alignment of
AlignLeft -> leftAlignBlock
AlignCenter -> centerAlignBlock
AlignRight -> rightAlignBlock
AlignDefault -> leftAlignBlock
let hpipeBlocks blocks = hcatBlocks [beg, middle, end]
where height = maximum (map heightOfBlock blocks)
sep = TextBlock 3 height (replicate height " | ")
beg = TextBlock 2 height (replicate height "| ")
end = TextBlock 2 height (replicate height " |")
middle = hcatBlocks $ intersperse sep blocks
let makeRow = hpipeBlocks . zipWith docToBlock widthsInChars
let head = makeRow headers'
rows' <- mapM (\row -> do cols <- mapM (blockListToRST opts) row
return $ makeRow cols) rows
let tableWidth = sum widthsInChars
let maxRowHeight = maximum $ map heightOfBlock (head:rows')
let border ch = char '+' <> char ch <>
(hcat $ intersperse (char ch <> char '+' <> char ch) $
map (\l -> text $ replicate l ch) widthsInChars) <>
char ch <> char '+'
let body = vcat $ intersperse (border '-') $ map blockToDoc rows'
return $ border '-' $+$ blockToDoc head $+$ border '=' $+$ body $+$
border '-' $$ caption'' $$ text ""
blockToRST opts (BulletList items) = do
contents <- mapM (bulletListItemToRST opts) items
-- ensure that sublists have preceding blank line
return $ text "" $+$ vcat contents <> text "\n"
blockToRST opts (OrderedList (start, style, delim) items) = do
let markers = if start == 1 && style == DefaultStyle && delim == DefaultDelim
then take (length items) $ repeat "#."
else take (length items) $ orderedListMarkers
(start, style, delim)
let maxMarkerLength = maximum $ map length markers
let markers' = map (\m -> let s = maxMarkerLength - length m
in m ++ replicate s ' ') markers
contents <- mapM (\(item, num) -> orderedListItemToRST opts item num) $
zip markers' items
-- ensure that sublists have preceding blank line
return $ text "" $+$ vcat contents <> text "\n"
blockToRST opts (DefinitionList items) = do
contents <- mapM (definitionListItemToRST opts) items
return $ (vcat contents) <> text "\n"
-- | Convert bullet list item (list of blocks) to RST.
bulletListItemToRST :: WriterOptions -> [Block] -> State WriterState Doc
bulletListItemToRST opts items = do
contents <- blockListToRST opts items
return $ hang (text "- ") 3 contents
-- | Convert ordered list item (a list of blocks) to RST.
orderedListItemToRST :: WriterOptions -- ^ options
-> String -- ^ marker for list item
-> [Block] -- ^ list item (list of blocks)
-> State WriterState Doc
orderedListItemToRST opts marker items = do
contents <- blockListToRST opts items
return $ hang (text marker) (length marker + 1) contents
-- | Convert defintion list item (label, list of blocks) to RST.
definitionListItemToRST :: WriterOptions -> ([Inline], [Block]) -> State WriterState Doc
definitionListItemToRST opts (label, items) = do
label <- inlineListToRST opts label
contents <- blockListToRST opts items
return $ label $+$ nest (writerTabStop opts) contents
-- | Convert list of Pandoc block elements to RST.
blockListToRST :: WriterOptions -- ^ Options
-> [Block] -- ^ List of block elements
-> State WriterState Doc
blockListToRST opts blocks =
mapM (blockToRST opts) blocks >>= return . vcat
-- | Convert list of Pandoc inline elements to RST.
inlineListToRST :: WriterOptions -> [Inline] -> State WriterState Doc
inlineListToRST opts lst = mapM (inlineToRST opts) lst >>= return . hcat
-- | Convert Pandoc inline element to RST.
inlineToRST :: WriterOptions -> Inline -> State WriterState Doc
inlineToRST opts (Emph lst) = do
contents <- inlineListToRST opts lst
return $ char '*' <> contents <> char '*'
inlineToRST opts (Strong lst) = do
contents <- inlineListToRST opts lst
return $ text "**" <> contents <> text "**"
inlineToRST opts (Strikeout lst) = do
contents <- inlineListToRST opts lst
return $ text "[STRIKEOUT:" <> contents <> char ']'
inlineToRST opts (Superscript lst) = do
contents <- inlineListToRST opts lst
return $ text "\\ :sup:`" <> contents <> text "`\\ "
inlineToRST opts (Subscript lst) = do
contents <- inlineListToRST opts lst
return $ text "\\ :sub:`" <> contents <> text "`\\ "
inlineToRST opts (Quoted SingleQuote lst) = do
contents <- inlineListToRST opts lst
return $ char '\'' <> contents <> char '\''
inlineToRST opts (Quoted DoubleQuote lst) = do
contents <- inlineListToRST opts lst
return $ char '"' <> contents <> char '"'
inlineToRST opts EmDash = return $ text "--"
inlineToRST opts EnDash = return $ char '-'
inlineToRST opts Apostrophe = return $ char '\''
inlineToRST opts Ellipses = return $ text "..."
inlineToRST opts (Code str) = return $ text $ "``" ++ str ++ "``"
inlineToRST opts (Str str) = return $ text $ escapeString str
inlineToRST opts (TeX str) = return $ text str
inlineToRST opts (HtmlInline str) = return empty
inlineToRST opts (LineBreak) = return $ char ' ' -- RST doesn't have linebreaks
inlineToRST opts Space = return $ char ' '
inlineToRST opts (Link [Code str] (src, tit)) | src == str ||
src == "mailto:" ++ str = do
let srcSuffix = if isPrefixOf "mailto:" src then drop 7 src else src
return $ text srcSuffix
inlineToRST opts (Link txt (src, tit)) = do
let useReferenceLinks = writerReferenceLinks opts
linktext <- inlineListToRST opts $ normalizeSpaces txt
if useReferenceLinks
then do (notes, refs, pics) <- get
let refs' = if (txt, (src, tit)) `elem` refs
then refs
else (txt, (src, tit)):refs
put (notes, refs', pics)
return $ char '`' <> linktext <> text "`_"
else return $ char '`' <> linktext <> text " <" <> text src <> text ">`_"
inlineToRST opts (Image alternate (source, tit)) = do
(notes, refs, pics) <- get
let labelsUsed = map fst pics
let txt = if null alternate || alternate == [Str ""] ||
alternate `elem` labelsUsed
then [Str $ "image" ++ show (length refs)]
else alternate
let pics' = if (txt, (source, tit)) `elem` pics
then pics
else (txt, (source, tit)):pics
put (notes, refs, pics')
label <- inlineListToRST opts txt
return $ char '|' <> label <> char '|'
inlineToRST opts (Note contents) = do
-- add to notes in state
modify (\(notes, refs, pics) -> (contents:notes, refs, pics))
(notes, _, _) <- get
let ref = show $ (length notes)
return $ text " [" <> text ref <> text "]_"
|