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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.Docbook
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 Docbook XML.
-}
module Text.Pandoc.Writers.Docbook (
writeDocbook
) where
import Text.Pandoc.Definition
import Text.Pandoc.Shared
import Text.Pandoc.Entities ( encodeEntities, stringToSGML )
import Data.Char ( toLower, ord )
import Data.List ( isPrefixOf, partition, drop )
import Text.PrettyPrint.HughesPJ hiding ( Str )
-- | Data structure for defining hierarchical Pandoc documents
data Element = Blk Block
| Sec [Inline] [Element] deriving (Eq, Read, Show)
-- | Returns true on Header block with level at least 'level'
headerAtLeast :: Int -> Block -> Bool
headerAtLeast level (Header x _) = x <= level
headerAtLeast level _ = False
-- | Convert list of Pandoc blocks into list of Elements (hierarchical)
hierarchicalize :: [Block] -> [Element]
hierarchicalize [] = []
hierarchicalize (block:rest) =
case block of
(Header level title) -> let (thisSection, rest') = break (headerAtLeast
level) rest in
(Sec title (hierarchicalize thisSection)):
(hierarchicalize rest')
x -> (Blk x):(hierarchicalize rest)
-- | Convert list of authors to a docbook <author> section
authorToDocbook :: [Char] -> Doc
authorToDocbook name = inTagsIndented "author" $
if ',' `elem` name
then -- last name first
let (lastname, rest) = break (==',') name
firstname = removeLeadingSpace rest in
inTagsSimple "firstname" (text $ stringToSGML firstname) <>
inTagsSimple "surname" (text $ stringToSGML lastname)
else -- last name last
let namewords = words name
lengthname = length namewords
(firstname, lastname) = case lengthname of
0 -> ("","")
1 -> ("", name)
n -> (joinWithSep " " (take (n-1) namewords), last namewords) in
inTagsSimple "firstname" (text $ stringToSGML firstname) $$
inTagsSimple "surname" (text $ stringToSGML lastname)
-- | Convert Pandoc document to string in Docbook format.
writeDocbook :: WriterOptions -> Pandoc -> String
writeDocbook opts (Pandoc (Meta title authors date) blocks) =
let head = if (writerStandalone opts)
then text (writerHeader opts)
else empty
meta = if (writerStandalone opts)
then inTagsIndented "articleinfo" $
(inTagsSimple "title" (wrap opts title)) $$
(vcat (map authorToDocbook authors)) $$
(inTagsSimple "date" (text $ stringToSGML date))
else empty
blocks' = replaceReferenceLinks blocks
(noteBlocks, blocks'') = partition isNoteBlock blocks'
opts' = opts {writerNotes = noteBlocks}
elements = hierarchicalize blocks''
before = writerIncludeBefore opts'
after = writerIncludeAfter opts'
body = (if null before then empty else text before) $$
vcat (map (elementToDocbook opts') elements) $$
(if null after then empty else text after)
body' = if writerStandalone opts'
then inTagsIndented "article" (meta $$ body)
else body in
render $ head $$ body' $$ text ""
-- | Convert an Element to Docbook.
elementToDocbook :: WriterOptions -> Element -> Doc
elementToDocbook opts (Blk block) = blockToDocbook opts block
elementToDocbook opts (Sec title elements) =
-- Docbook doesn't allow sections with no content, so insert some if needed
let elements' = if null elements
then [Blk (Para [])]
else elements in
inTagsIndented "section" $
inTagsSimple "title" (wrap opts title) $$
vcat (map (elementToDocbook opts) elements')
-- | Convert a list of Pandoc blocks to Docbook.
blocksToDocbook :: WriterOptions -> [Block] -> Doc
blocksToDocbook opts = vcat . map (blockToDocbook opts)
-- | Convert a list of lists of blocks to a list of Docbook list items.
listItemsToDocbook :: WriterOptions -> [[Block]] -> Doc
listItemsToDocbook opts items =
vcat $ map (listItemToDocbook opts) items
-- | Convert a list of blocks into a Docbook list item.
listItemToDocbook :: WriterOptions -> [Block] -> Doc
listItemToDocbook opts item =
let plainToPara (Plain x) = Para x
plainToPara y = y in
let item' = map plainToPara item in
inTagsIndented "listitem" (blocksToDocbook opts item')
-- | Convert a Pandoc block element to Docbook.
blockToDocbook :: WriterOptions -> Block -> Doc
blockToDocbook opts Blank = text ""
blockToDocbook opts Null = empty
blockToDocbook opts (Plain lst) = wrap opts lst
blockToDocbook opts (Para lst) =
inTagsIndented "para" (wrap opts lst)
blockToDocbook opts (BlockQuote blocks) =
inTagsIndented "blockquote" (blocksToDocbook opts blocks)
blockToDocbook opts (CodeBlock str) =
text "<screen>\n" <> text (encodeEntities str) <> text "\n</screen>"
blockToDocbook opts (BulletList lst) =
inTagsIndented "itemizedlist" $ listItemsToDocbook opts lst
blockToDocbook opts (OrderedList lst) =
inTagsIndented "orderedlist" $ listItemsToDocbook opts lst
blockToDocbook opts (RawHtml str) = text str -- raw XML block
blockToDocbook opts HorizontalRule = empty -- not semantic
blockToDocbook opts (Note _ _) = empty -- shouldn't occur
blockToDocbook opts (Key _ _) = empty -- shouldn't occur
blockToDocbook opts (Table caption aligns widths headers rows) =
let alignStrings = map alignmentToString aligns
captionDoc = if null caption
then empty
else inTagsIndented "caption"
(inlinesToDocbook opts caption)
tableType = if isEmpty captionDoc then "informaltable" else "table" in
inTagsIndented tableType $ captionDoc $$
(colHeadsToDocbook opts alignStrings widths headers) $$
(vcat $ map (tableRowToDocbook opts alignStrings) rows)
colHeadsToDocbook opts alignStrings widths headers =
let heads = zipWith3
(\align width item -> tableItemToDocbook opts "th" align width item)
alignStrings widths headers in
inTagsIndented "tr" $ vcat heads
alignmentToString alignment = case alignment of
AlignLeft -> "left"
AlignRight -> "right"
AlignCenter -> "center"
AlignDefault -> "left"
tableRowToDocbook opts aligns cols =
inTagsIndented "tr" $ vcat $ zipWith3 (tableItemToDocbook opts "td") aligns (repeat 0) cols
tableItemToDocbook opts tag align width item =
let attrib = [("align", align)] ++
if (width /= 0)
then [("style", "{width: " ++
show (truncate (100*width)) ++ "%;}")]
else [] in
inTags True tag attrib $ vcat $ map (blockToDocbook opts) item
-- | Put string in CDATA section
cdata :: String -> Doc
cdata str = text $ "<![CDATA[" ++ str ++ "]]>"
-- | Take list of inline elements and return wrapped doc.
wrap :: WriterOptions -> [Inline] -> Doc
wrap opts lst = fsep $ map (inlinesToDocbook opts) (splitBy Space lst)
-- | Convert a list of inline elements to Docbook.
inlinesToDocbook :: WriterOptions -> [Inline] -> Doc
inlinesToDocbook opts lst = hcat (map (inlineToDocbook opts) lst)
-- | Convert an inline element to Docbook.
inlineToDocbook :: WriterOptions -> Inline -> Doc
inlineToDocbook opts (Str str) = text $ encodeEntities str
inlineToDocbook opts (Emph lst) =
inTagsSimple "emphasis" (inlinesToDocbook opts lst)
inlineToDocbook opts (Strong lst) =
inTags False "emphasis" [("role", "strong")]
(inlinesToDocbook opts lst)
inlineToDocbook opts (Quoted _ lst) =
inTagsSimple "quote" (inlinesToDocbook opts lst)
inlineToDocbook opts Apostrophe = text "'"
inlineToDocbook opts Ellipses = text "…"
inlineToDocbook opts EmDash = text "—"
inlineToDocbook opts EnDash = text "–"
inlineToDocbook opts (Code str) =
inTagsSimple "literal" $ text (encodeEntities str)
inlineToDocbook opts (TeX str) = inlineToDocbook opts (Code str)
inlineToDocbook opts (HtmlInline str) = empty
inlineToDocbook opts LineBreak =
text $ "<literallayout></literallayout>"
inlineToDocbook opts Space = char ' '
inlineToDocbook opts (Link txt (Src src tit)) =
if isPrefixOf "mailto:" src
then inTagsSimple "email" $ text (encodeEntities $ drop 7 src)
else inTags False "ulink" [("url", src)] $ inlinesToDocbook opts txt
inlineToDocbook opts (Link text (Ref ref)) = empty -- shouldn't occur
inlineToDocbook opts (Image alt (Src src tit)) =
let titleDoc = if null tit
then empty
else inTagsIndented "objectinfo" $
inTagsIndented "title"
(text $ stringToSGML tit) in
inTagsIndented "inlinemediaobject" $
inTagsIndented "imageobject" $
titleDoc $$ selfClosingTag "imagedata" [("fileref", src)]
inlineToDocbook opts (Image alternate (Ref ref)) = empty --shouldn't occur
inlineToDocbook opts (NoteRef ref) =
let notes = writerNotes opts
hits = filter (\(Note r _) -> r == ref) notes in
if null hits
then empty
else let (Note _ contents) = head hits in
inTagsIndented "footnote" $ blocksToDocbook opts contents
|
