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{-# LANGUAGE OverloadedStrings #-}
{-
Copyright (C) 2007-2010 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.ConTeXt
Copyright : Copyright (C) 2007-2010 John MacFarlane
License : GNU GPL, version 2 or above
Maintainer : John MacFarlane <jgm@berkeley.edu>
Stability : alpha
Portability : portable
Conversion of 'Pandoc' format into ConTeXt.
-}
module Text.Pandoc.Writers.ConTeXt ( writeConTeXt ) where
import Text.Pandoc.Definition
import Text.Pandoc.Shared
import Text.Printf ( printf )
import Data.List ( intercalate )
import Control.Monad.State
import Text.Pandoc.Pretty
import Text.Pandoc.Templates ( renderTemplate )
data WriterState =
WriterState { stNextRef :: Int -- number of next URL reference
, stOrderedListLevel :: Int -- level of ordered list
, stOptions :: WriterOptions -- writer options
}
orderedListStyles :: [[Char]]
orderedListStyles = cycle ["[n]","[a]", "[r]", "[g]"]
-- | Convert Pandoc to ConTeXt.
writeConTeXt :: WriterOptions -> Pandoc -> String
writeConTeXt options document =
let defaultWriterState = WriterState { stNextRef = 1
, stOrderedListLevel = 0
, stOptions = options
}
in evalState (pandocToConTeXt options document) defaultWriterState
pandocToConTeXt :: WriterOptions -> Pandoc -> State WriterState String
pandocToConTeXt options (Pandoc (Meta title authors date) blocks) = do
let colwidth = if writerWrapText options
then Just $ writerColumns options
else Nothing
titletext <- if null title
then return ""
else liftM (render colwidth) $ inlineListToConTeXt title
authorstext <- mapM (liftM (render colwidth) . inlineListToConTeXt) authors
datetext <- if null date
then return ""
else liftM (render colwidth) $ inlineListToConTeXt date
body <- blockListToConTeXt blocks
let main = render colwidth $ body
let context = writerVariables options ++
[ ("toc", if writerTableOfContents options then "yes" else "")
, ("body", main)
, ("title", titletext)
, ("date", datetext) ] ++
[ ("author", a) | a <- authorstext ]
return $ if writerStandalone options
then renderTemplate context $ writerTemplate options
else main
-- escape things as needed for ConTeXt
escapeCharForConTeXt :: Char -> String
escapeCharForConTeXt ch =
case ch of
'{' -> "\\letteropenbrace{}"
'}' -> "\\letterclosebrace{}"
'\\' -> "\\letterbackslash{}"
'$' -> "\\$"
'|' -> "\\letterbar{}"
'^' -> "\\letterhat{}"
'%' -> "\\%"
'~' -> "\\lettertilde{}"
'&' -> "\\&"
'#' -> "\\#"
'<' -> "\\letterless{}"
'>' -> "\\lettermore{}"
'[' -> "{[}"
']' -> "{]}"
'_' -> "\\letterunderscore{}"
'\160' -> "~"
x -> [x]
-- | Escape string for ConTeXt
stringToConTeXt :: String -> String
stringToConTeXt = concatMap escapeCharForConTeXt
-- | Convert Pandoc block element to ConTeXt.
blockToConTeXt :: Block
-> State WriterState Doc
blockToConTeXt Null = return empty
blockToConTeXt (Plain lst) = inlineListToConTeXt lst
blockToConTeXt (Para [Image txt (src,_)]) = do
capt <- inlineListToConTeXt txt
return $ blankline $$ "\\placefigure[here,nonumber]" <> braces capt <>
braces ("\\externalfigure" <> brackets (text src)) <> blankline
blockToConTeXt (Para lst) = do
contents <- inlineListToConTeXt lst
return $ contents <> blankline
blockToConTeXt (BlockQuote lst) = do
contents <- blockListToConTeXt lst
return $ "\\startblockquote" $$ nest 0 contents $$ "\\stopblockquote" <> blankline
blockToConTeXt (CodeBlock _ str) =
return $ "\\starttyping" <> cr <> flush (text str) <> cr <> "\\stoptyping" $$ blankline
-- blankline because \stoptyping can't have anything after it, inc. '}'
blockToConTeXt (RawBlock "context" str) = return $ text str <> blankline
blockToConTeXt (RawBlock _ _ ) = return empty
blockToConTeXt (BulletList lst) = do
contents <- mapM listItemToConTeXt lst
return $ "\\startitemize" $$ vcat contents $$ text "\\stopitemize" <> blankline
blockToConTeXt (OrderedList (start, style', delim) lst) = do
st <- get
let level = stOrderedListLevel st
put $ st {stOrderedListLevel = level + 1}
contents <- mapM listItemToConTeXt lst
put $ st {stOrderedListLevel = level}
let start' = if start == 1 then "" else "start=" ++ show start
let delim' = case delim of
DefaultDelim -> ""
Period -> "stopper=."
OneParen -> "stopper=)"
TwoParens -> "left=(,stopper=)"
let width = maximum $ map length $ take (length contents)
(orderedListMarkers (start, style', delim))
let width' = (toEnum width + 1) / 2
let width'' = if width' > (1.5 :: Double)
then "width=" ++ show width' ++ "em"
else ""
let specs2Items = filter (not . null) [start', delim', width'']
let specs2 = if null specs2Items
then ""
else "[" ++ intercalate "," specs2Items ++ "]"
let style'' = case style' of
DefaultStyle -> orderedListStyles !! level
Decimal -> "[n]"
Example -> "[n]"
LowerRoman -> "[r]"
UpperRoman -> "[R]"
LowerAlpha -> "[a]"
UpperAlpha -> "[A]"
let specs = style'' ++ specs2
return $ "\\startitemize" <> text specs $$ vcat contents $$
"\\stopitemize" <> blankline
blockToConTeXt (DefinitionList lst) =
liftM vcat $ mapM defListItemToConTeXt lst
blockToConTeXt HorizontalRule = return $ "\\thinrule" <> blankline
blockToConTeXt (Header level lst) = do
contents <- inlineListToConTeXt lst
st <- get
let opts = stOptions st
let base = if writerNumberSections opts then "section" else "subject"
let level' = if writerChapters opts then level - 1 else level
return $ if level' >= 1 && level' <= 5
then char '\\' <> text (concat (replicate (level' - 1) "sub")) <>
text base <> char '{' <> contents <> char '}' <> blankline
else if level' == 0
then "\\chapter{" <> contents <> "}"
else contents <> blankline
blockToConTeXt (Table caption aligns widths heads rows) = do
let colDescriptor colWidth alignment = (case alignment of
AlignLeft -> 'l'
AlignRight -> 'r'
AlignCenter -> 'c'
AlignDefault -> 'l'):
if colWidth == 0
then "|"
else ("p(" ++ printf "%.2f" colWidth ++ "\\textwidth)|")
let colDescriptors = "|" ++ (concat $
zipWith colDescriptor widths aligns)
headers <- if all null heads
then return empty
else liftM ($$ "\\HL") $ tableRowToConTeXt heads
captionText <- inlineListToConTeXt caption
let captionText' = if null caption then text "none" else captionText
rows' <- mapM tableRowToConTeXt rows
return $ "\\placetable[here]" <> braces captionText' $$
"\\starttable" <> brackets (text colDescriptors) $$
"\\HL" $$ headers $$
vcat rows' $$ "\\HL" $$ "\\stoptable" <> blankline
tableRowToConTeXt :: [[Block]] -> State WriterState Doc
tableRowToConTeXt cols = do
cols' <- mapM blockListToConTeXt cols
return $ (vcat (map ("\\NC " <>) cols')) $$ "\\NC\\AR"
listItemToConTeXt :: [Block] -> State WriterState Doc
listItemToConTeXt list = blockListToConTeXt list >>=
return . ("\\item" $$) . (nest 2)
defListItemToConTeXt :: ([Inline], [[Block]]) -> State WriterState Doc
defListItemToConTeXt (term, defs) = do
term' <- inlineListToConTeXt term
def' <- liftM vsep $ mapM blockListToConTeXt defs
return $ "\\startdescr" <> braces term' $$ nest 2 def' $$
"\\stopdescr" <> blankline
-- | Convert list of block elements to ConTeXt.
blockListToConTeXt :: [Block] -> State WriterState Doc
blockListToConTeXt lst = liftM vcat $ mapM blockToConTeXt lst
-- | Convert list of inline elements to ConTeXt.
inlineListToConTeXt :: [Inline] -- ^ Inlines to convert
-> State WriterState Doc
inlineListToConTeXt lst = liftM hcat $ mapM inlineToConTeXt lst
-- | Convert inline element to ConTeXt
inlineToConTeXt :: Inline -- ^ Inline to convert
-> State WriterState Doc
inlineToConTeXt (Emph lst) = do
contents <- inlineListToConTeXt lst
return $ braces $ "\\em " <> contents
inlineToConTeXt (Strong lst) = do
contents <- inlineListToConTeXt lst
return $ braces $ "\\bf " <> contents
inlineToConTeXt (Strikeout lst) = do
contents <- inlineListToConTeXt lst
return $ "\\overstrikes" <> braces contents
inlineToConTeXt (Superscript lst) = do
contents <- inlineListToConTeXt lst
return $ "\\high" <> braces contents
inlineToConTeXt (Subscript lst) = do
contents <- inlineListToConTeXt lst
return $ "\\low" <> braces contents
inlineToConTeXt (SmallCaps lst) = do
contents <- inlineListToConTeXt lst
return $ braces $ "\\sc " <> contents
inlineToConTeXt (Code str) | not ('{' `elem` str || '}' `elem` str) =
return $ "\\type" <> braces (text str)
inlineToConTeXt (Code str) =
return $ "\\mono" <> braces (text $ stringToConTeXt str)
inlineToConTeXt (Quoted SingleQuote lst) = do
contents <- inlineListToConTeXt lst
return $ "\\quote" <> braces contents
inlineToConTeXt (Quoted DoubleQuote lst) = do
contents <- inlineListToConTeXt lst
return $ "\\quotation" <> braces contents
inlineToConTeXt (Cite _ lst) = inlineListToConTeXt lst
inlineToConTeXt Apostrophe = return $ char '\''
inlineToConTeXt EmDash = return "---"
inlineToConTeXt EnDash = return "--"
inlineToConTeXt Ellipses = return "\\ldots{}"
inlineToConTeXt (Str str) = return $ text $ stringToConTeXt str
inlineToConTeXt (Math InlineMath str) =
return $ char '$' <> text str <> char '$'
inlineToConTeXt (Math DisplayMath str) =
return $ text "\\startformula " <> text str <> text " \\stopformula"
inlineToConTeXt (RawInline "context" str) = return $ text str
-- backwards compatibility, allow latex too
inlineToConTeXt (RawInline "latex" str) = return $ text str
inlineToConTeXt (RawInline _ _) = return empty
inlineToConTeXt (LineBreak) = return $ text "\\crlf" <> cr
inlineToConTeXt Space = return space
inlineToConTeXt (Link [Code str] (src, tit)) = -- since ConTeXt has its own
inlineToConTeXt (Link [Str str] (src, tit)) -- way of printing links...
inlineToConTeXt (Link txt (src, _)) = do
st <- get
let next = stNextRef st
put $ st {stNextRef = next + 1}
let ref = show next
label <- inlineListToConTeXt txt
return $ "\\useURL" <> brackets (text ref) <> brackets (text src) <>
brackets empty <> brackets label <>
"\\from" <> brackets (text ref)
inlineToConTeXt (Image _ (src, _)) = do
return $ braces $ "\\externalfigure" <> brackets (text src)
inlineToConTeXt (Note contents) = do
contents' <- blockListToConTeXt contents
return $ text "\\footnote{" <>
nest 2 contents' <> char '}'
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