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{-
Copyright (C) 2006-7 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) 2006-7 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.Printf ( printf )
import Data.List ( (\\) )
-- | Convert Pandoc to LaTeX.
writeLaTeX :: WriterOptions -> Pandoc -> String
writeLaTeX options (Pandoc meta blocks) =
let body = (writerIncludeBefore options) ++
(concatMap blockToLaTeX blocks) ++
(writerIncludeAfter options) in
let head = if writerStandalone options
then latexHeader options meta
else "" in
let foot = if writerStandalone options then "\n\\end{document}\n" else "" in
head ++ body ++ foot
-- | Insert bibliographic information into LaTeX header.
latexHeader :: WriterOptions -- ^ Options, including LaTeX header
-> Meta -- ^ Meta with bibliographic information
-> String
latexHeader options (Meta title authors date) =
let titletext = if null title
then ""
else "\\title{" ++ inlineListToLaTeX title ++ "}\n"
authorstext = if null authors
then ""
else "\\author{" ++ (joinWithSep "\\\\"
(map stringToLaTeX authors)) ++ "}\n"
datetext = if date == ""
then ""
else "\\date{" ++ stringToLaTeX date ++ "}\n"
maketitle = if null title then "" else "\\maketitle\n"
secnumline = if (writerNumberSections options)
then ""
else "\\setcounter{secnumdepth}{0}\n"
header = writerHeader options in
header ++ secnumline ++ titletext ++ authorstext ++ datetext ++
"\\begin{document}\n" ++ maketitle
-- escape things as needed for LaTeX (also ldots, dashes, quotes, etc.)
escapeBrackets = backslashEscape "{}"
escapeSpecial = backslashEscape "$%&~_#"
escapeBackslash = substitute "\\" "\\textbackslash{}"
fixBackslash = substitute "\\textbackslash\\{\\}" "\\textbackslash{}"
escapeHat = substitute "^" "\\^{}"
escapeBar = substitute "|" "\\textbar{}"
escapeLt = substitute "<" "\\textless{}"
escapeGt = substitute ">" "\\textgreater{}"
-- | Escape string for LaTeX
stringToLaTeX :: String -> String
stringToLaTeX = escapeGt . escapeLt . escapeBar . escapeHat .
escapeSpecial . fixBackslash . escapeBrackets .
escapeBackslash
-- | Remove all code elements from list of inline elements
-- (because it's illegal to have a \\verb inside a command argument)
deVerb :: [Inline] -> [Inline]
deVerb [] = []
deVerb ((Code str):rest) = (Str str):(deVerb rest)
deVerb (other:rest) = other:(deVerb rest)
-- | Convert Pandoc block element to LaTeX.
blockToLaTeX :: Block -- ^ Block to convert
-> String
blockToLaTeX Null = ""
blockToLaTeX (Plain lst) = inlineListToLaTeX lst ++ "\n"
blockToLaTeX (Para lst) = (inlineListToLaTeX lst) ++ "\n\n"
blockToLaTeX (BlockQuote lst) = "\\begin{quote}\n" ++
(concatMap blockToLaTeX lst) ++ "\\end{quote}\n"
blockToLaTeX (CodeBlock str) = "\\begin{verbatim}\n" ++ str ++
"\n\\end{verbatim}\n"
blockToLaTeX (RawHtml str) = ""
blockToLaTeX (BulletList lst) = "\\begin{itemize}\n" ++
(concatMap listItemToLaTeX lst) ++ "\\end{itemize}\n"
blockToLaTeX (OrderedList lst) = "\\begin{enumerate}\n" ++
(concatMap listItemToLaTeX lst) ++ "\\end{enumerate}\n"
blockToLaTeX (DefinitionList lst) =
let defListItemToLaTeX (term, def) = "\\item[" ++
substitute "]" "\\]" (inlineListToLaTeX term) ++ "] " ++
concatMap blockToLaTeX def
in "\\begin{description}\n" ++ concatMap defListItemToLaTeX lst ++
"\\end{description}\n"
blockToLaTeX HorizontalRule =
"\\begin{center}\\rule{3in}{0.4pt}\\end{center}\n\n"
blockToLaTeX (Header level lst) =
if (level > 0) && (level <= 3)
then "\\" ++ (concat (replicate (level - 1) "sub")) ++ "section{" ++
(inlineListToLaTeX (deVerb lst)) ++ "}\n\n"
else (inlineListToLaTeX lst) ++ "\n\n"
blockToLaTeX (Table caption aligns widths heads rows) =
let colWidths = map printDecimal widths
colDescriptors = concat $ zipWith
(\width align -> ">{\\PBS" ++
(case align of
AlignLeft -> "\\raggedright"
AlignRight -> "\\raggedleft"
AlignCenter -> "\\centering"
AlignDefault -> "\\raggedright") ++
"\\hspace{0pt}}p{" ++ width ++
"\\textwidth}")
colWidths aligns
headers = tableRowToLaTeX heads
captionText = inlineListToLaTeX caption
tableBody = "\\begin{tabular}{" ++ colDescriptors ++ "}\n" ++
headers ++ "\\hline\n" ++
(concatMap tableRowToLaTeX rows) ++
"\\end{tabular}\n"
centered str = "\\begin{center}\n" ++ str ++ "\\end{center}\n" in
if null captionText
then centered tableBody ++ "\n"
else "\\begin{table}[h]\n" ++ centered tableBody ++ "\\caption{" ++
captionText ++ "}\n" ++ "\\end{table}\n\n"
printDecimal :: Float -> String
printDecimal = printf "%.2f"
tableColumnWidths cols = map (length . (concatMap blockToLaTeX)) cols
tableRowToLaTeX cols = joinWithSep " & " (map (concatMap blockToLaTeX) cols) ++ "\\\\\n"
listItemToLaTeX list = "\\item " ++
(concatMap blockToLaTeX list)
-- | Convert list of inline elements to LaTeX.
inlineListToLaTeX :: [Inline] -- ^ Inlines to convert
-> String
inlineListToLaTeX lst =
concatMap inlineToLaTeX lst
isQuoted :: Inline -> Bool
isQuoted (Quoted _ _) = True
isQuoted Apostrophe = True
isQuoted _ = False
-- | Convert inline element to LaTeX
inlineToLaTeX :: Inline -- ^ Inline to convert
-> String
inlineToLaTeX (Emph lst) = "\\emph{" ++
(inlineListToLaTeX (deVerb lst)) ++ "}"
inlineToLaTeX (Strong lst) = "\\textbf{" ++
(inlineListToLaTeX (deVerb lst)) ++ "}"
inlineToLaTeX (Code str) = "\\verb" ++ [chr] ++ stuffing ++ [chr]
where stuffing = str
chr = ((enumFromTo '!' '~') \\ stuffing) !! 0
inlineToLaTeX (Quoted SingleQuote lst) =
let s1 = if (not (null lst)) && (isQuoted (head lst)) then "\\," else ""
s2 = if (not (null lst)) && (isQuoted (last lst)) then "\\," else "" in
"`" ++ s1 ++ inlineListToLaTeX lst ++ s2 ++ "'"
inlineToLaTeX (Quoted DoubleQuote lst) =
let s1 = if (not (null lst)) && (isQuoted (head lst)) then "\\," else ""
s2 = if (not (null lst)) && (isQuoted (last lst)) then "\\," else "" in
"``" ++ s1 ++ inlineListToLaTeX lst ++ s2 ++ "''"
inlineToLaTeX Apostrophe = "'"
inlineToLaTeX EmDash = "---"
inlineToLaTeX EnDash = "--"
inlineToLaTeX Ellipses = "\\ldots{}"
inlineToLaTeX (Str str) = stringToLaTeX str
inlineToLaTeX (TeX str) = str
inlineToLaTeX (HtmlInline str) = ""
inlineToLaTeX (LineBreak) = "\\\\\n"
inlineToLaTeX Space = " "
inlineToLaTeX (Link text (src, tit)) =
"\\href{" ++ src ++ "}{" ++ (inlineListToLaTeX (deVerb text)) ++ "}"
inlineToLaTeX (Image alternate (source, tit)) =
"\\includegraphics{" ++ source ++ "}"
inlineToLaTeX (Note contents) =
"\\footnote{" ++ (stripTrailingNewlines $ concatMap blockToLaTeX contents) ++ "}"
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