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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.Writers.RTF
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 'Pandoc' documents to RTF (rich text format).
-}
module Text.Pandoc.Writers.RTF ( writeRTF) where
import Text.Pandoc.Definition
import Text.Pandoc.Shared
import Text.Regex ( matchRegexAll, mkRegex )
import Data.List ( isSuffixOf )
import Data.Char ( ord, chr )
-- | Convert Pandoc to a string in rich text format.
writeRTF :: WriterOptions -> Pandoc -> String
writeRTF options (Pandoc meta blocks) =
let head = if writerStandalone options
then rtfHeader (writerHeader options) meta
else ""
foot = if writerStandalone options then "\n}\n" else ""
body = (writerIncludeBefore options) ++ concatMap (blockToRTF 0) blocks ++
(writerIncludeAfter options) in
head ++ body ++ foot
-- | Convert unicode characters (> 127) into rich text format representation.
handleUnicode :: String -> String
handleUnicode [] = []
handleUnicode (c:cs) = if (ord c) > 127
then '\\':'u':(show (ord c)) ++ "?" ++
(handleUnicode cs)
else c:(handleUnicode cs)
escapeSpecial = backslashEscape "{\\}"
escapeTab = substitute "\\t" "\\tab "
-- | Escape strings as needed for rich text format.
stringToRTF :: String -> String
stringToRTF = handleUnicode . escapeSpecial . escapeTab
-- | Escape raw LaTeX strings for RTF. Don't escape \t; it might
-- be the first letter of a command!
latexStringToRTF :: String -> String
latexStringToRTF = handleUnicode . escapeSpecial
-- | Escape things as needed for code block in RTF.
codeStringToRTF :: String -> String
codeStringToRTF str = joinWithSep "\\line\n" (lines (stringToRTF str))
-- | Deal with raw LaTeX.
latexToRTF :: String -> String
latexToRTF str = "{\\cf1 " ++ (latexStringToRTF str) ++ "\\cf0 } "
-- | Make a paragraph with first-line indent, block indent, and space after.
rtfParSpaced :: Int -- ^ space after (in twips)
-> Int -- ^ block indent (in twips)
-> Int -- ^ first line indent (relative to block) (in twips)
-> String -- ^ string with content
-> String
rtfParSpaced spaceAfter indent firstLineIndent content =
"{\\pard \\f0 \\sa" ++ (show spaceAfter) ++ " \\li" ++ (show indent) ++
" \\fi" ++ (show firstLineIndent) ++ " " ++ content ++ "\\par}\n"
-- | Default paragraph.
rtfPar :: Int -- ^ block indent (in twips)
-> Int -- ^ first line indent (relative to block) (in twips)
-> String -- ^ string with content
-> String
rtfPar = rtfParSpaced 180
-- | Compact paragraph (e.g. for compact list items).
rtfCompact :: Int -- ^ block indent (in twips)
-> Int -- ^ first line indent (relative to block) (in twips)
-> String -- ^ string with content
-> String
rtfCompact = rtfParSpaced 0
-- number of twips to indent
indentIncrement = 720
listIncrement = 360
-- | Returns appropriate bullet list marker for indent level.
bulletMarker :: Int -> String
bulletMarker indent = case (indent `mod` 720) of
0 -> "\\bullet "
otherwise -> "\\endash "
-- | Returns appropriate (list of) ordered list markers for indent level.
orderedMarkers :: Int -> [String]
orderedMarkers indent =
case (indent `mod` 720) of
0 -> map (\x -> show x ++ ".") [1..]
otherwise -> map (\x -> show x ++ ".") $ cycle ['a'..'z']
-- | Returns RTF header.
rtfHeader :: String -- ^ header text
-> Meta -- ^ bibliographic information
-> String
rtfHeader headerText (Meta title authors date) =
let titletext = if null title
then ""
else rtfPar 0 0 ("\\qc \\b \\fs36 " ++
inlineListToRTF title)
authorstext = if null authors
then ""
else rtfPar 0 0 ("\\qc " ++ (joinWithSep "\\"
(map stringToRTF authors)))
datetext = if date == ""
then ""
else rtfPar 0 0 ("\\qc " ++ stringToRTF date) in
let spacer = if null (titletext ++ authorstext ++ datetext)
then ""
else rtfPar 0 0 "" in
headerText ++ titletext ++ authorstext ++ datetext ++ spacer
-- | Convert Pandoc block element to RTF.
blockToRTF :: Int -- ^ indent level
-> Block -- ^ block to convert
-> String
blockToRTF indent Null = ""
blockToRTF indent (Plain lst) =
rtfCompact indent 0 (inlineListToRTF lst)
blockToRTF indent (Para lst) =
rtfPar indent 0 (inlineListToRTF lst)
blockToRTF indent (BlockQuote lst) =
concatMap (blockToRTF (indent + indentIncrement)) lst
blockToRTF indent (CodeBlock str) =
rtfPar indent 0 ("\\f1 " ++ (codeStringToRTF str))
blockToRTF indent (RawHtml str) = ""
blockToRTF indent (BulletList lst) =
spaceAtEnd $
concatMap (listItemToRTF indent (bulletMarker indent)) lst
blockToRTF indent (OrderedList lst) =
spaceAtEnd $ concat $
zipWith (listItemToRTF indent) (orderedMarkers indent) lst
blockToRTF indent HorizontalRule =
rtfPar indent 0 "\\qc \\emdash\\emdash\\emdash\\emdash\\emdash"
blockToRTF indent (Header level lst) =
rtfPar indent 0 ("\\b \\fs" ++ (show (40 - (level * 4))) ++ " " ++
(inlineListToRTF lst))
blockToRTF indent (Table caption _ _ headers rows) =
blockToRTF indent (Para [Str "pandoc: TABLE unsupported in RST writer"])
-- | Ensure that there's the same amount of space after compact
-- lists as after regular lists.
spaceAtEnd :: String -> String
spaceAtEnd str =
if isSuffixOf "\\par}\n" str
then (take ((length str) - 6) str) ++ "\\sa180\\par}\n"
else str
-- | Convert list item (list of blocks) to RTF.
listItemToRTF :: Int -- ^ indent level
-> String -- ^ list start marker
-> [Block] -- ^ list item (list of blocks)
-> [Char]
listItemToRTF indent marker [] =
rtfCompact (indent + listIncrement) (0 - listIncrement)
(marker ++ "\\tx" ++ (show listIncrement) ++ "\\tab ")
listItemToRTF indent marker list =
let (first:rest) = map (blockToRTF (indent + listIncrement)) list in
-- insert the list marker into the (processed) first block
let modFirst = case matchRegexAll (mkRegex "\\\\fi-?[0-9]+") first of
Just (before, matched, after, _) -> before ++ "\\fi" ++
show (0 - listIncrement) ++ " " ++ marker ++ "\\tx" ++
show listIncrement ++ "\\tab" ++ after
Nothing -> first in
modFirst ++ (concat rest)
-- | Convert list of inline items to RTF.
inlineListToRTF :: [Inline] -- ^ list of inlines to convert
-> String
inlineListToRTF lst = concatMap inlineToRTF lst
-- | Convert inline item to RTF.
inlineToRTF :: Inline -- ^ inline to convert
-> String
inlineToRTF (Emph lst) = "{\\i " ++ (inlineListToRTF lst) ++ "} "
inlineToRTF (Strong lst) =
"{\\b " ++ (inlineListToRTF lst) ++ "} "
inlineToRTF (Quoted SingleQuote lst) =
"\\u8216'" ++ (inlineListToRTF lst) ++ "\\u8217'"
inlineToRTF (Quoted DoubleQuote lst) =
"\\u8220\"" ++ (inlineListToRTF lst) ++ "\\u8221\""
inlineToRTF Apostrophe = "\\u8217'"
inlineToRTF Ellipses = "\\u8230?"
inlineToRTF EmDash = "\\u8212-"
inlineToRTF EnDash = "\\u8211-"
inlineToRTF (Code str) = "{\\f1 " ++ (codeStringToRTF str) ++ "} "
inlineToRTF (Str str) = stringToRTF str
inlineToRTF (TeX str) = latexToRTF str
inlineToRTF (HtmlInline str) = ""
inlineToRTF (LineBreak) = "\\line "
inlineToRTF Space = " "
inlineToRTF (Link text (src, tit)) =
"{\\field{\\*\\fldinst{HYPERLINK \"" ++ (codeStringToRTF src) ++
"\"}}{\\fldrslt{\\ul\n" ++ (inlineListToRTF text) ++ "\n}}}\n"
inlineToRTF (Image alternate (source, tit)) =
"{\\cf1 [image: " ++ source ++ "]\\cf0}"
inlineToRTF (Note contents) =
"{\\super\\chftn}{\\*\\footnote\\chftn\\~\\plain\\pard " ++
(concatMap (blockToRTF 0) contents) ++ "}"
|
