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|
-- | Convert Pandoc to rich text format.
module Text.Pandoc.Writers.RTF (
writeRTF
) where
import Text.Pandoc.Definition
import Text.Pandoc.Shared
import List ( isSuffixOf )
import Char ( ord, chr )
-- | Convert Pandoc to a string in rich text format.
writeRTF :: WriterOptions -> Pandoc -> String
writeRTF options (Pandoc meta blocks) =
let notes = filter isNoteBlock blocks in -- assumes all notes are at outer level
let head = if writerStandalone options then
rtfHeader notes (writerHeader options) meta
else
""
foot = if writerStandalone options then "\n}\n" else ""
body = (writerIncludeBefore options) ++
(concatMap (blockToRTF notes 0) (replaceReferenceLinks 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 = gsub "\\\\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 \\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 :: [Block] -- ^ list of note blocks
-> String -- ^ header text
-> Meta -- ^ bibliographic information
-> String
rtfHeader notes headerText (Meta title authors date) =
let titletext = if null title then
""
else
rtfPar 0 0 ("\\qc \\b \\fs36 " ++ inlineListToRTF notes 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 :: [Block] -- ^ list of note blocks
-> Int -- ^ indent level
-> Block -- ^ block to convert
-> String
blockToRTF notes indent Blank = rtfPar indent 0 ""
blockToRTF notes indent Null = ""
blockToRTF notes indent (Plain lst) = rtfCompact indent 0 (inlineListToRTF notes lst)
blockToRTF notes indent (Para lst) = rtfPar indent 0 (inlineListToRTF notes lst)
blockToRTF notes indent (BlockQuote lst) =
concatMap (blockToRTF notes (indent + indentIncrement)) lst
blockToRTF notes indent (Note ref lst) = "" -- there shouldn't be any after filtering
blockToRTF notes indent (Key _ _) = ""
blockToRTF notes indent (CodeBlock str) = rtfPar indent 0 ("\\f1 " ++ (codeStringToRTF str))
blockToRTF notes indent (RawHtml str) = ""
blockToRTF notes indent (BulletList lst) =
spaceAtEnd $ concatMap (listItemToRTF notes indent (bulletMarker indent)) lst
blockToRTF notes indent (OrderedList lst) =
spaceAtEnd $ concat $ zipWith (listItemToRTF notes indent) (orderedMarkers indent) lst
blockToRTF notes indent HorizontalRule =
rtfPar indent 0 "\\qc \\emdash\\emdash\\emdash\\emdash\\emdash"
blockToRTF notes indent (Header level lst) =
rtfPar indent 0 ("\\b \\fs" ++ (show (40 - (level * 4))) ++ " " ++
(inlineListToRTF notes lst))
-- | 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 :: [Block] -- ^ list of note blocks
-> Int -- ^ indent level
-> String -- ^ list start marker
-> [Block] -- ^ list item (list of blocks)
-> [Char]
listItemToRTF notes indent marker [] =
rtfCompact (indent + listIncrement) (0 - listIncrement)
(marker ++ "\\tx" ++ (show listIncrement) ++ "\\tab ")
listItemToRTF notes indent marker list =
let (first:rest) = map (blockToRTF notes (indent + listIncrement)) list in
let modFirst = gsub "\\\\fi-?[0-9]+" ("\\\\fi" ++ (show (0 - listIncrement)) ++
" " ++ marker ++ "\\\\tx" ++ (show listIncrement) ++ "\\\\tab") first in
modFirst ++ (concat rest)
-- | Convert list of inline items to RTF.
inlineListToRTF :: [Block] -- ^ list of note blocks
-> [Inline] -- ^ list of inlines to convert
-> String
inlineListToRTF notes lst = concatMap (inlineToRTF notes) lst
-- | Convert inline item to RTF.
inlineToRTF :: [Block] -- ^ list of note blocks
-> Inline -- ^ inline to convert
-> String
inlineToRTF notes (Emph lst) = "{\\i " ++ (inlineListToRTF notes lst) ++ "} "
inlineToRTF notes (Strong lst) = "{\\b " ++ (inlineListToRTF notes lst) ++ "} "
inlineToRTF notes (Code str) = "{\\f1 " ++ (codeStringToRTF str) ++ "} "
inlineToRTF notes (Str str) = stringToRTF str
inlineToRTF notes (TeX str) = latexToRTF str
inlineToRTF notes (HtmlInline str) = ""
inlineToRTF notes (LineBreak) = "\\line "
inlineToRTF notes Space = " "
inlineToRTF notes (Link text (Src src tit)) =
"{\\field{\\*\\fldinst{HYPERLINK \"" ++ (codeStringToRTF src) ++ "\"}}{\\fldrslt{\\ul\n"
++ (inlineListToRTF notes text) ++ "\n}}}\n"
inlineToRTF notes (Link text (Ref [])) = "[" ++ (inlineListToRTF notes text) ++ "]"
inlineToRTF notes (Link text (Ref ref)) = "[" ++ (inlineListToRTF notes text) ++ "][" ++
(inlineListToRTF notes ref) ++ "]" -- this is what markdown does, for better or worse
inlineToRTF notes (Image alternate (Src source tit)) = "{\\cf1 [image: " ++ source ++ "]\\cf0}"
inlineToRTF notes (Image alternate (Ref [])) = "![" ++ (inlineListToRTF notes alternate) ++ "]"
inlineToRTF notes (Image alternate (Ref ref)) = "![" ++ (inlineListToRTF notes alternate) ++
"][" ++ (inlineListToRTF notes ref) ++ "]"
inlineToRTF [] (NoteRef ref) = ""
inlineToRTF ((Note firstref firstblocks):rest) (NoteRef ref) =
if firstref == ref then
"{\\super\\chftn}{\\*\\footnote\\chftn\\~\\plain\\pard " ++
(concatMap (blockToRTF rest 0) firstblocks) ++ "}"
else
inlineToRTF rest (NoteRef ref)
|
