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{-
Copyright (C) 2006-8 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.LaTeX
Copyright : Copyright (C) 2006-8 John MacFarlane
License : GNU GPL, version 2 or above
Maintainer : John MacFarlane <jgm@berkeley.edu>
Stability : alpha
Portability : portable
Conversion of 'Pandoc' format into LaTeX.
-}
module Text.Pandoc.Writers.LaTeX ( writeLaTeX ) where
import Text.Pandoc.Definition
import Text.Pandoc.Shared
import Text.Pandoc.Templates
import Text.Printf ( printf )
import Data.List ( (\\), isSuffixOf, isPrefixOf, intersperse )
import Data.Char ( toLower )
import Control.Monad.State
import Text.PrettyPrint.HughesPJ hiding ( Str )
data WriterState =
WriterState { stInNote :: Bool -- @True@ if we're in a note
, stOLLevel :: Int -- level of ordered list nesting
, stOptions :: WriterOptions -- writer options, so they don't have to be parameter
, stVerbInNote :: Bool -- true if document has verbatim text in note
, stEnumerate :: Bool -- true if document needs fancy enumerated lists
, stTable :: Bool -- true if document has a table
, stStrikeout :: Bool -- true if document has strikeout
, stSubscript :: Bool -- true if document has subscript
, stUrl :: Bool -- true if document has visible URL link
, stGraphics :: Bool -- true if document contains images
, stLHS :: Bool -- true if document has literate haskell code
, stBook :: Bool -- true if document uses book or memoir class
}
-- | Convert Pandoc to LaTeX.
writeLaTeX :: WriterOptions -> Pandoc -> String
writeLaTeX options document =
evalState (pandocToLaTeX options document) $
WriterState { stInNote = False, stOLLevel = 1, stOptions = options,
stVerbInNote = False, stEnumerate = False,
stTable = False, stStrikeout = False, stSubscript = False,
stUrl = False, stGraphics = False,
stLHS = False, stBook = False }
pandocToLaTeX :: WriterOptions -> Pandoc -> State WriterState String
pandocToLaTeX options (Pandoc (Meta title authors date) blocks) = do
let template = writerTemplate options
let usesBookClass x = "\\documentclass" `isPrefixOf` x &&
("{memoir}" `isSuffixOf` x || "{book}" `isSuffixOf` x ||
"{report}" `isSuffixOf` x)
when (any usesBookClass (lines template)) $
modify $ \s -> s{stBook = True}
titletext <- liftM render $ inlineListToLaTeX title
authorsText <- mapM (liftM render . inlineListToLaTeX) authors
dateText <- liftM render $ inlineListToLaTeX date
body <- blockListToLaTeX blocks
let before = if null (writerIncludeBefore options)
then empty
else text $ writerIncludeBefore options
let after = if null (writerIncludeAfter options)
then empty
else text $ writerIncludeAfter options
let main = render $ before $$ body $$ after
st <- get
let context = writerVariables options ++
[ ("toc", if writerTableOfContents options then "yes" else "")
, ("body", main)
, ("title", titletext)
, ("date", dateText) ] ++
[ ("author", a) | a <- authorsText ] ++
[ ("xetex", "yes") | writerXeTeX options ] ++
[ ("verbatim-in-note", "yes") | stVerbInNote st ] ++
[ ("fancy-enums", "yes") | stEnumerate st ] ++
[ ("tables", "yes") | stTable st ] ++
[ ("strikeout", "yes") | stStrikeout st ] ++
[ ("subscript", "yes") | stSubscript st ] ++
[ ("url", "yes") | stUrl st ] ++
[ ("lhs", "yes") | stLHS st ] ++
[ ("graphics", "yes") | stGraphics st ]
return $ if writerStandalone options
then renderTemplate context template
else main
-- escape things as needed for LaTeX
stringToLaTeX :: String -> String
stringToLaTeX = escapeStringUsing latexEscapes
where latexEscapes = backslashEscapes "{}$%&_#" ++
[ ('^', "\\^{}")
, ('\\', "\\textbackslash{}")
, ('~', "\\ensuremath{\\sim}")
, ('|', "\\textbar{}")
, ('<', "\\textless{}")
, ('>', "\\textgreater{}")
, ('\160', "~")
]
-- | Puts contents into LaTeX command.
inCmd :: String -> Doc -> Doc
inCmd cmd contents = char '\\' <> text cmd <> braces contents
-- | Remove all code elements from list of inline elements
-- (because it's illegal to have verbatim inside some command arguments)
deVerb :: [Inline] -> [Inline]
deVerb [] = []
deVerb ((Code str):rest) =
(TeX $ "\\texttt{" ++ stringToLaTeX str ++ "}"):(deVerb rest)
deVerb (other:rest) = other:(deVerb rest)
-- | Convert Pandoc block element to LaTeX.
blockToLaTeX :: Block -- ^ Block to convert
-> State WriterState Doc
blockToLaTeX Null = return empty
blockToLaTeX (Plain lst) = do
st <- get
let opts = stOptions st
wrapTeXIfNeeded opts True inlineListToLaTeX lst
blockToLaTeX (Para lst) = do
st <- get
let opts = stOptions st
result <- wrapTeXIfNeeded opts True inlineListToLaTeX lst
return $ result <> char '\n'
blockToLaTeX (BlockQuote lst) = do
contents <- blockListToLaTeX lst
return $ text "\\begin{quote}" $$ contents $$ text "\\end{quote}"
blockToLaTeX (CodeBlock (_,classes,_) str) = do
st <- get
env <- if writerLiterateHaskell (stOptions st) && "haskell" `elem` classes &&
"literate" `elem` classes
then do
modify $ \s -> s{ stLHS = True }
return "code"
else if stInNote st
then do
modify $ \s -> s{ stVerbInNote = True }
return "Verbatim"
else return "verbatim"
return $ text ("\\begin{" ++ env ++ "}\n") <> text str <>
text ("\n\\end{" ++ env ++ "}")
blockToLaTeX (RawHtml _) = return empty
blockToLaTeX (BulletList lst) = do
items <- mapM listItemToLaTeX lst
return $ text "\\begin{itemize}" $$ vcat items $$ text "\\end{itemize}"
blockToLaTeX (OrderedList (start, numstyle, numdelim) lst) = do
st <- get
let oldlevel = stOLLevel st
put $ st {stOLLevel = oldlevel + 1}
items <- mapM listItemToLaTeX lst
modify (\s -> s {stOLLevel = oldlevel})
exemplar <- if numstyle /= DefaultStyle || numdelim /= DefaultDelim
then do
modify $ \s -> s{ stEnumerate = True }
return $ char '[' <>
text (head (orderedListMarkers (1, numstyle,
numdelim))) <> char ']'
else return empty
let resetcounter = if start /= 1 && oldlevel <= 4
then text $ "\\setcounter{enum" ++
map toLower (toRomanNumeral oldlevel) ++
"}{" ++ show (start - 1) ++ "}"
else empty
return $ text "\\begin{enumerate}" <> exemplar $$ resetcounter $$
vcat items $$ text "\\end{enumerate}"
blockToLaTeX (DefinitionList lst) = do
items <- mapM defListItemToLaTeX lst
return $ text "\\begin{description}" $$ vcat items $$
text "\\end{description}"
blockToLaTeX HorizontalRule = return $ text $
"\\begin{center}\\rule{3in}{0.4pt}\\end{center}\n"
blockToLaTeX (Header level lst) = do
let lst' = deVerb lst
txt <- inlineListToLaTeX lst'
let noNote (Note _) = Str ""
noNote x = x
let lstNoNotes = processWith noNote lst'
-- footnotes in sections don't work unless you specify an optional
-- argument: \section[mysec]{mysec\footnote{blah}}
optional <- if lstNoNotes == lst'
then return empty
else do
res <- inlineListToLaTeX lstNoNotes
return $ char '[' <> res <> char ']'
let stuffing = optional <> char '{' <> txt <> char '}'
book <- liftM stBook get
return $ case (book, level) of
(True, 1) -> text "\\chapter" <> stuffing <> char '\n'
(True, 2) -> text "\\section" <> stuffing <> char '\n'
(True, 3) -> text "\\subsection" <> stuffing <> char '\n'
(True, 4) -> text "\\subsubsection" <> stuffing <> char '\n'
(False, 1) -> text "\\section" <> stuffing <> char '\n'
(False, 2) -> text "\\subsection" <> stuffing <> char '\n'
(False, 3) -> text "\\subsubsection" <> stuffing <> char '\n'
_ -> txt <> char '\n'
blockToLaTeX (Table caption aligns widths heads rows) = do
headers <- tableRowToLaTeX heads
captionText <- inlineListToLaTeX caption
rows' <- mapM tableRowToLaTeX rows
let colDescriptors = concat $ zipWith toColDescriptor widths aligns
let tableBody = text ("\\begin{tabular}{" ++ colDescriptors ++ "}") $$
headers $$ text "\\hline" $$ vcat rows' $$
text "\\end{tabular}"
let centered txt = text "\\begin{center}" $$ txt $$ text "\\end{center}"
modify $ \s -> s{ stTable = True }
return $ if isEmpty captionText
then centered tableBody <> char '\n'
else text "\\begin{table}[h]" $$ centered tableBody $$
inCmd "caption" captionText $$ text "\\end{table}\n"
toColDescriptor :: Double -> Alignment -> String
toColDescriptor 0 align =
case align of
AlignLeft -> "l"
AlignRight -> "r"
AlignCenter -> "c"
AlignDefault -> "l"
toColDescriptor width align = ">{\\PBS" ++
(case align of
AlignLeft -> "\\raggedright"
AlignRight -> "\\raggedleft"
AlignCenter -> "\\centering"
AlignDefault -> "\\raggedright") ++
"\\hspace{0pt}}p{" ++ printf "%.2f" width ++
"\\columnwidth}"
blockListToLaTeX :: [Block] -> State WriterState Doc
blockListToLaTeX lst = mapM blockToLaTeX lst >>= return . vcat
tableRowToLaTeX :: [[Block]] -> State WriterState Doc
tableRowToLaTeX cols = mapM blockListToLaTeX cols >>=
return . ($$ text "\\\\") . foldl (\row item -> row $$
(if isEmpty row then text "" else text " & ") <> item) empty
listItemToLaTeX :: [Block] -> State WriterState Doc
listItemToLaTeX lst = blockListToLaTeX lst >>= return . (text "\\item" $$) .
(nest 2)
defListItemToLaTeX :: ([Inline], [[Block]]) -> State WriterState Doc
defListItemToLaTeX (term, defs) = do
term' <- inlineListToLaTeX $ deVerb term
def' <- liftM (vcat . intersperse (text "")) $ mapM blockListToLaTeX defs
return $ text "\\item[" <> term' <> text "]" $$ def'
-- | Convert list of inline elements to LaTeX.
inlineListToLaTeX :: [Inline] -- ^ Inlines to convert
-> State WriterState Doc
inlineListToLaTeX lst = mapM inlineToLaTeX lst >>= return . hcat
isQuoted :: Inline -> Bool
isQuoted (Quoted _ _) = True
isQuoted Apostrophe = True
isQuoted _ = False
-- | Convert inline element to LaTeX
inlineToLaTeX :: Inline -- ^ Inline to convert
-> State WriterState Doc
inlineToLaTeX (Emph lst) =
inlineListToLaTeX (deVerb lst) >>= return . inCmd "emph"
inlineToLaTeX (Strong lst) =
inlineListToLaTeX (deVerb lst) >>= return . inCmd "textbf"
inlineToLaTeX (Strikeout lst) = do
contents <- inlineListToLaTeX $ deVerb lst
modify $ \s -> s{ stStrikeout = True }
return $ inCmd "sout" contents
inlineToLaTeX (Superscript lst) =
inlineListToLaTeX (deVerb lst) >>= return . inCmd "textsuperscript"
inlineToLaTeX (Subscript lst) = do
modify $ \s -> s{ stSubscript = True }
contents <- inlineListToLaTeX $ deVerb lst
-- oddly, latex includes \textsuperscript but not \textsubscript
-- so we have to define it (using a different name so as not to conflict with memoir class):
return $ inCmd "textsubscr" contents
inlineToLaTeX (SmallCaps lst) =
inlineListToLaTeX (deVerb lst) >>= return . inCmd "textsc"
inlineToLaTeX (Cite _ lst) =
inlineListToLaTeX lst
inlineToLaTeX (Code str) = do
st <- get
when (stInNote st) $ modify $ \s -> s{ stVerbInNote = True }
let chr = ((enumFromTo '!' '~') \\ str) !! 0
return $ text $ "\\verb" ++ [chr] ++ str ++ [chr]
inlineToLaTeX (Quoted SingleQuote lst) = do
contents <- inlineListToLaTeX lst
let s1 = if (not (null lst)) && (isQuoted (head lst))
then text "\\,"
else empty
let s2 = if (not (null lst)) && (isQuoted (last lst))
then text "\\,"
else empty
return $ char '`' <> s1 <> contents <> s2 <> char '\''
inlineToLaTeX (Quoted DoubleQuote lst) = do
contents <- inlineListToLaTeX lst
let s1 = if (not (null lst)) && (isQuoted (head lst))
then text "\\,"
else empty
let s2 = if (not (null lst)) && (isQuoted (last lst))
then text "\\,"
else empty
return $ text "``" <> s1 <> contents <> s2 <> text "''"
inlineToLaTeX Apostrophe = return $ char '\''
inlineToLaTeX EmDash = return $ text "---"
inlineToLaTeX EnDash = return $ text "--"
inlineToLaTeX Ellipses = return $ text "\\ldots{}"
inlineToLaTeX (Str str) = return $ text $ stringToLaTeX str
inlineToLaTeX (Math InlineMath str) = return $ char '$' <> text str <> char '$'
inlineToLaTeX (Math DisplayMath str) = return $ text "\\[" <> text str <> text "\\]"
inlineToLaTeX (TeX str) = return $ text str
inlineToLaTeX (HtmlInline _) = return empty
inlineToLaTeX (LineBreak) = return $ text "\\\\"
inlineToLaTeX Space = return $ char ' '
inlineToLaTeX (Link txt (src, _)) =
case txt of
[Code x] | x == src -> -- autolink
do modify $ \s -> s{ stUrl = True }
return $ text $ "\\url{" ++ x ++ "}"
_ -> do contents <- inlineListToLaTeX $ deVerb txt
return $ text ("\\href{" ++ src ++ "}{") <> contents <>
char '}'
inlineToLaTeX (Image _ (source, _)) = do
modify $ \s -> s{ stGraphics = True }
return $ text $ "\\includegraphics{" ++ source ++ "}"
inlineToLaTeX (Note contents) = do
st <- get
put (st {stInNote = True})
contents' <- blockListToLaTeX contents
modify (\s -> s {stInNote = False})
let rawnote = stripTrailingNewlines $ render contents'
-- note: a \n before } is needed when note ends with a Verbatim environment
let optNewline = "\\end{Verbatim}" `isSuffixOf` rawnote
return $ text "\\footnote{" <>
text rawnote <> (if optNewline then char '\n' else empty) <> char '}'
|