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{- |
Module : Text.Pandoc.Writers.LaTeX
Copyright : Copyright (C) 2006 John MacFarlane
License : GNU GPL, version 2 or above
Maintainer : John MacFarlane <jgm at berkeley dot edu>
Stability : provisional
Portability : portable
Conversion of 'Pandoc' format into LaTeX.
-}
module Text.Pandoc.Writers.LaTeX (
writeLaTeX
) where
import Text.Pandoc.Definition
import Text.Pandoc.Shared
import List ( (\\) )
-- | Convert Pandoc to LaTeX.
writeLaTeX :: WriterOptions -> Pandoc -> String
writeLaTeX options (Pandoc meta blocks) =
let notes = filter isNoteBlock blocks in -- assumes all notes at outer level
let body = (writerIncludeBefore options) ++
(concatMap (blockToLaTeX notes)
(replaceReferenceLinks blocks)) ++
(writerIncludeAfter options) in
let head = if writerStandalone options
then latexHeader notes 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 :: [Block] -- ^ List of note blocks to use in resolving note refs
-> WriterOptions -- ^ Options, including LaTeX header
-> Meta -- ^ Meta with bibliographic information
-> String
latexHeader notes options (Meta title authors date) =
let titletext = if null title
then ""
else "\\title{" ++ inlineListToLaTeX notes 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 = gsub "\\\\" "\\\\textbackslash{}"
fixBackslash = gsub "\\\\textbackslash\\\\\\{\\\\\\}" "\\\\textbackslash{}"
escapeHat = gsub "\\^" "\\\\^{}"
escapeBar = gsub "\\|" "\\\\textbar{}"
escapeLt = gsub "<" "\\\\textless{}"
escapeGt = gsub ">" "\\\\textgreater{}"
escapeDoubleQuotes =
gsub "\"" "''" . -- rest are right quotes .
gsub "``\\\\footnote" "''\\\\footnote" . -- except \footnote
gsub "\"\\\\" "``\\\\" . -- left quote before latex command
gsub "([[:space:]])\"" "\\1``" . -- never right quote after space
gsub "\"('|`)([^[:punct:][:space:]])" "``{}`\\2" . -- "'word left
gsub "\"([^[:punct:][:space:]])" "``\\1" -- "word left
escapeSingleQuotes =
gsub "`\\\\footnote" "'\\\\footnote" . -- except \footnote
gsub "'\\\\" "`\\\\" . -- left quote before latex command
gsub "('|`)(\"|``)" "`{}``" . -- '"word left
gsub "([^[:punct:][:space:]])`(s|S)" "\\1'\\2" . -- catch possessives
gsub "^'([^[:punct:][:space:]])" "`\\1" . -- 'word left
gsub "([[:space:]])'" "\\1`" . -- never right quote after space
gsub "([[:space:]])'([^[:punct:][:space:]])" "\\1`\\2"
-- 'word left (leave possessives)
escapeEllipses = gsub "\\.\\.\\.|\\. \\. \\." "\\ldots{}"
escapeDashes = gsub "([0-9])-([0-9])" "\\1--\\2" .
gsub " *--- *" "---" .
gsub "([^-])--([^-])" "\\1---\\2"
escapeSmart = escapeDashes . escapeSingleQuotes . escapeDoubleQuotes .
escapeEllipses
-- | Escape string for LaTeX (including smart quotes, dashes, ellipses)
stringToLaTeX :: String -> String
stringToLaTeX = escapeSmart . 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] -- ^ List of note blocks to use in resolving note refs
-> Block -- ^ Block to convert
-> String
blockToLaTeX notes Blank = "\n"
blockToLaTeX notes Null = ""
blockToLaTeX notes (Plain lst) = inlineListToLaTeX notes lst ++ "\n"
blockToLaTeX notes (Para lst) = (inlineListToLaTeX notes lst) ++ "\n\n"
blockToLaTeX notes (BlockQuote lst) = "\\begin{quote}\n" ++
(concatMap (blockToLaTeX notes) lst) ++ "\\end{quote}\n"
blockToLaTeX notes (Note ref lst) = ""
blockToLaTeX notes (Key _ _) = ""
blockToLaTeX notes (CodeBlock str) = "\\begin{verbatim}\n" ++ str ++
"\n\\end{verbatim}\n"
blockToLaTeX notes (RawHtml str) = ""
blockToLaTeX notes (BulletList lst) = "\\begin{itemize}\n" ++
(concatMap (listItemToLaTeX notes) lst) ++ "\\end{itemize}\n"
blockToLaTeX notes (OrderedList lst) = "\\begin{enumerate}\n" ++
(concatMap (listItemToLaTeX notes) lst) ++ "\\end{enumerate}\n"
blockToLaTeX notes HorizontalRule =
"\\begin{center}\\rule{3in}{0.4pt}\\end{center}\n\n"
blockToLaTeX notes (Header level lst) =
if (level > 0) && (level <= 3)
then "\\" ++ (concat (replicate (level - 1) "sub")) ++ "section{" ++
(inlineListToLaTeX notes (deVerb lst)) ++ "}\n\n"
else (inlineListToLaTeX notes lst) ++ "\n\n"
listItemToLaTeX notes list = "\\item " ++
(concatMap (blockToLaTeX notes) list)
-- | Convert list of inline elements to LaTeX.
inlineListToLaTeX :: [Block] -- ^ List of note blocks to use in resolving note refs
-> [Inline] -- ^ Inlines to convert
-> String
inlineListToLaTeX notes lst =
-- first, consolidate Str and Space for more effective smartquotes:
let lst' = consolidateList lst in
concatMap (inlineToLaTeX notes) lst'
-- | Convert inline element to LaTeX
inlineToLaTeX :: [Block] -- ^ List of note blocks to use in resolving note refs
-> Inline -- ^ Inline to convert
-> String
inlineToLaTeX notes (Emph lst) = "\\emph{" ++
(inlineListToLaTeX notes (deVerb lst)) ++ "}"
inlineToLaTeX notes (Strong lst) = "\\textbf{" ++
(inlineListToLaTeX notes (deVerb lst)) ++ "}"
inlineToLaTeX notes (Code str) = "\\verb" ++ [chr] ++ stuffing ++ [chr]
where stuffing = str
chr = ((enumFromTo '!' '~') \\ stuffing) !! 0
inlineToLaTeX notes (Str str) = stringToLaTeX str
inlineToLaTeX notes (TeX str) = str
inlineToLaTeX notes (HtmlInline str) = ""
inlineToLaTeX notes (LineBreak) = "\\\\\n"
inlineToLaTeX notes Space = " "
inlineToLaTeX notes (Link text (Src src tit)) =
"\\href{" ++ src ++ "}{" ++ (inlineListToLaTeX notes (deVerb text)) ++ "}"
inlineToLaTeX notes (Link text (Ref [])) = "[" ++
(inlineListToLaTeX notes text) ++ "]"
inlineToLaTeX notes (Link text (Ref ref)) = "[" ++
(inlineListToLaTeX notes text) ++ "][" ++ (inlineListToLaTeX notes ref) ++
"]" -- this is what markdown does, for better or worse
inlineToLaTeX notes (Image alternate (Src source tit)) =
"\\includegraphics{" ++ source ++ "}"
inlineToLaTeX notes (Image alternate (Ref [])) =
"![" ++ (inlineListToLaTeX notes alternate) ++ "]"
inlineToLaTeX notes (Image alternate (Ref ref)) =
"![" ++ (inlineListToLaTeX notes alternate) ++ "][" ++
(inlineListToLaTeX notes ref) ++ "]"
inlineToLaTeX [] (NoteRef ref) = ""
inlineToLaTeX ((Note firstref firstblocks):rest) (NoteRef ref) =
if (firstref == ref)
then "\\footnote{" ++ (stripTrailingNewlines
(concatMap (blockToLaTeX rest) firstblocks)) ++ "}"
else inlineToLaTeX rest (NoteRef ref)
|
