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2011-11-17 15:45:33 -06:00
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vim/plugin/vim-markdown-preview/kramdown/converter/latex.rb Executable file
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# -*- coding: utf-8 -*-
#
#--
# Copyright (C) 2009-2010 Thomas Leitner <t_leitner@gmx.at>
#
# This file is part of kramdown.
#
# kramdown 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 3 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, see <http://www.gnu.org/licenses/>.
#++
#
require 'set'
module Kramdown
module Converter
# Converts a Kramdown::Document to LaTeX. This converter uses ideas from other Markdown-to-LaTeX
# converters like Pandoc and Maruku.
class Latex < Base
# :stopdoc:
# Initialize the LaTeX converter with the given Kramdown document +doc+.
def initialize(doc)
super
#TODO: set the footnote counter at the beginning of the document
@doc.options[:footnote_nr]
@doc.conversion_infos[:packages] = Set.new
end
def convert(el, opts = {})
send("convert_#{el.type}", el, opts)
end
def inner(el, opts)
result = ''
el.children.each do |inner_el|
result << send("convert_#{inner_el.type}", inner_el, opts)
end
result
end
def convert_root(el, opts)
inner(el, opts)
end
def convert_blank(el, opts)
""
end
def convert_text(el, opts)
escape(el.value)
end
def convert_p(el, opts)
"#{inner(el, opts)}\n\n"
end
def convert_codeblock(el, opts)
show_whitespace = el.options[:attr] && el.options[:attr]['class'].to_s =~ /\bshow-whitespaces\b/
lang = el.options[:attr] && el.options[:attr]['lang']
if show_whitespace || lang
result = "\\lstset{showspaces=%s,showtabs=%s}\n" % (show_whitespace ? ['true', 'true'] : ['false', 'false'])
result += "\\lstset{language=#{lang}}\n" if lang
result += "\\lstset{basicstyle=\\ttfamily\\footnotesize}\\lstset{columns=fixed,frame=tlbr}\n"
"#{result}\\begin{lstlisting}#{attribute_list(el)}\n#{el.value}\n\\end{lstlisting}\n"
else
"\\begin{verbatim}#{el.value}\\end{verbatim}\n"
end
end
def latex_environment(type, el, text)
"\\begin{#{type}}#{attribute_list(el)}\n#{text}\n\\end{#{type}}\n"
end
def convert_blockquote(el, opts)
latex_environment('quote', el, inner(el, opts))
end
HEADER_TYPES = {
1 => 'section',
2 => 'subsection',
3 => 'subsubsection',
4 => 'paragraph',
5 => 'subparagraph',
6 => 'subparagraph'
}
def convert_header(el, opts)
type = HEADER_TYPES[el.options[:level]]
if ((el.options[:attr] && (id = el.options[:attr]['id'])) ||
(@doc.options[:auto_ids] && (id = generate_id(el.options[:raw_text])))) &&
(@doc.options[:toc_depth] <= 0 || el.options[:level] <= @doc.options[:toc_depth])
"\\hypertarget{#{id}}{}\\#{type}{#{inner(el, opts)}}\\label{#{id}}\n\n"
else
"\\#{type}*{#{inner(el, opts)}}\n\n"
end
end
def convert_hr(el, opts)
"\\begin{center}#{attribute_list(el)}\n\\rule{3in}{0.4pt}\n\\end{center}\n"
end
def convert_ul(el, opts)
if !@doc.conversion_infos[:has_toc] && (el.options[:ial][:refs].include?('toc') rescue nil)
@doc.conversion_infos[:has_toc] = true
'\tableofcontents'
else
latex_environment(el.type == :ul ? 'itemize' : 'enumerate', el, inner(el, opts))
end
end
alias :convert_ol :convert_ul
def convert_dl(el, opts)
latex_environment('description', el, inner(el, opts))
end
def convert_li(el, opts)
"\\item #{inner(el, opts).sub(/\n+\Z/, '')}\n"
end
def convert_dt(el, opts)
"\\item[#{inner(el, opts)}] "
end
def convert_dd(el, opts)
"#{inner(el, opts)}\n\n"
end
def convert_html_element(el, opts)
if el.value == 'i'
"\\emph{#{inner(el, opts)}}"
elsif el.value == 'b'
"\\emph{#{inner(el, opts)}}"
else
@doc.warnings << "Can't convert HTML element"
''
end
end
def convert_xml_comment(el, opts)
el.value.split(/\n/).map {|l| "% #{l}"}.join("\n") + "\n"
end
def convert_xml_pi(el, opts)
@doc.warnings << "Can't convert XML PI/HTML document type"
''
end
alias :convert_html_doctype :convert_xml_pi
TABLE_ALIGNMENT_CHAR = {:default => 'l', :left => 'l', :center => 'c', :right => 'r'}
def convert_table(el, opts)
align = el.options[:alignment].map {|a| TABLE_ALIGNMENT_CHAR[a]}.join('|')
"\\begin{tabular}{|#{align}|}#{attribute_list(el)}\n\\hline\n#{inner(el, opts)}\\hline\n\\end{tabular}\n\n"
end
def convert_thead(el, opts)
"#{inner(el, opts)}\\hline\n"
end
def convert_tbody(el, opts)
inner(el, opts)
end
def convert_tfoot(el, opts)
"\\hline \\hline \n#{inner(el, opts)}"
end
def convert_tr(el, opts)
el.children.map {|c| send("convert_#{c.type}", c, opts)}.join(' & ') + "\\\\\n"
end
def convert_td(el, opts)
inner(el, opts)
end
alias :convert_th :convert_td
def convert_comment(el, opts)
el.value.split(/\n/).map {|l| "% #{l}"}.join("\n") + "\n"
end
def convert_br(el, opts)
"\\newline\n"
end
def convert_a(el, opts)
url = el.options[:attr]['href']
if url =~ /^#/
"\\hyperlink{#{url[1..-1]}}{#{inner(el, opts)}}"
else
"\\href{#{url}}{#{inner(el, opts)}}"
end
end
def convert_img(el, opts)
if el.options[:attr]['src'] =~ /^(https?|ftps?):\/\//
@doc.warnings << "Cannot include non-local image"
''
elsif !el.options[:attr]['src'].empty?
@doc.conversion_infos[:packages] << 'graphicx'
"\\includegraphics{#{el.options[:attr]['src']}}"
else
@doc.warnings << "Cannot include image with empty path"
''
end
end
def convert_codespan(el, opts)
"{\\tt #{escape(el.value)}}"
end
def convert_footnote(el, opts)
@doc.conversion_infos[:packages] << 'fancyvrb'
"\\footnote{#{inner(@doc.parse_infos[:footnotes][el.options[:name]][:content], opts)}}"
end
def convert_raw(el, opts)
escape(el.value)
end
def convert_em(el, opts)
"\\emph{#{inner(el, opts)}}"
end
def convert_strong(el, opts)
"\\textbf{#{inner(el, opts)}}"
end
# Inspired by Maruku: entity conversion table based on the one from htmltolatex
# (http://sourceforge.net/projects/htmltolatex/), with some small adjustments/additions
ENTITY_CONV_TABLE = {
913 => ['$A$'],
914 => ['$B$'],
915 => ['$\Gamma$'],
916 => ['$\Delta$'],
917 => ['$E$'],
918 => ['$Z$'],
919 => ['$H$'],
920 => ['$\Theta$'],
921 => ['$I$'],
922 => ['$K$'],
923 => ['$\Lambda$'],
924 => ['$M$'],
925 => ['$N$'],
926 => ['$\Xi$'],
927 => ['$O$'],
928 => ['$\Pi$'],
929 => ['$P$'],
931 => ['$\Sigma$'],
932 => ['$T$'],
933 => ['$Y$'],
934 => ['$\Phi$'],
935 => ['$X$'],
936 => ['$\Psi$'],
937 => ['$\Omega$'],
945 => ['$\alpha$'],
946 => ['$\beta$'],
947 => ['$\gamma$'],
948 => ['$\delta$'],
949 => ['$\epsilon$'],
950 => ['$\zeta$'],
951 => ['$\eta$'],
952 => ['$\theta$'],
953 => ['$\iota$'],
954 => ['$\kappa$'],
955 => ['$\lambda$'],
956 => ['$\mu$'],
957 => ['$\nu$'],
958 => ['$\xi$'],
959 => ['$o$'],
960 => ['$\pi$'],
961 => ['$\rho$'],
963 => ['$\sigma$'],
964 => ['$\tau$'],
965 => ['$\upsilon$'],
966 => ['$\phi$'],
967 => ['$\chi$'],
968 => ['$\psi$'],
969 => ['$\omega$'],
962 => ['$\varsigma$'],
977 => ['$\vartheta$'],
982 => ['$\varpi$'],
8230 => ['\ldots'],
8242 => ['$\prime$'],
8254 => ['-'],
8260 => ['/'],
8472 => ['$\wp$'],
8465 => ['$\Im$'],
8476 => ['$\Re$'],
8501 => ['$\aleph$'],
8226 => ['$\bullet$'],
8482 => ['$^{\rm TM}$'],
8592 => ['$\leftarrow$'],
8594 => ['$\rightarrow$'],
8593 => ['$\uparrow$'],
8595 => ['$\downarrow$'],
8596 => ['$\leftrightarrow$'],
8629 => ['$\hookleftarrow$'],
8657 => ['$\Uparrow$'],
8659 => ['$\Downarrow$'],
8656 => ['$\Leftarrow$'],
8658 => ['$\Rightarrow$'],
8660 => ['$\Leftrightarrow$'],
8704 => ['$\forall$'],
8706 => ['$\partial$'],
8707 => ['$\exists$'],
8709 => ['$\emptyset$'],
8711 => ['$\nabla$'],
8712 => ['$\in$'],
8715 => ['$\ni$'],
8713 => ['$\notin$'],
8721 => ['$\sum$'],
8719 => ['$\prod$'],
8722 => ['$-$'],
8727 => ['$\ast$'],
8730 => ['$\surd$'],
8733 => ['$\propto$'],
8734 => ['$\infty$'],
8736 => ['$\angle$'],
8743 => ['$\wedge$'],
8744 => ['$\vee$'],
8745 => ['$\cup$'],
8746 => ['$\cap$'],
8747 => ['$\int$'],
8756 => ['$\therefore$', 'amssymb'],
8764 => ['$\sim$'],
8776 => ['$\approx$'],
8773 => ['$\cong$'],
8800 => ['$\neq$'],
8801 => ['$\equiv$'],
8804 => ['$\leq$'],
8805 => ['$\geq$'],
8834 => ['$\subset$'],
8835 => ['$\supset$'],
8838 => ['$\subseteq$'],
8839 => ['$\supseteq$'],
8836 => ['$\nsubset$', 'amssymb'],
8853 => ['$\oplus$'],
8855 => ['$\otimes$'],
8869 => ['$\perp$'],
8901 => ['$\cdot$'],
8968 => ['$\rceil$'],
8969 => ['$\lceil$'],
8970 => ['$\lfloor$'],
8971 => ['$\rfloor$'],
9001 => ['$\rangle$'],
9002 => ['$\langle$'],
9674 => ['$\lozenge$', 'amssymb'],
9824 => ['$\spadesuit$'],
9827 => ['$\clubsuit$'],
9829 => ['$\heartsuit$'],
9830 => ['$\diamondsuit$'],
38 => ['\&'],
34 => ['"'],
39 => ['\''],
169 => ['\copyright'],
60 => ['\textless{}'],
62 => ['\textgreater{}'],
338 => ['\OE'],
339 => ['\oe'],
352 => ['\v{S}'],
353 => ['\v{s}'],
376 => ['\"Y'],
710 => ['\textasciicircum'],
732 => ['\textasciitilde'],
8211 => ['--'],
8212 => ['---'],
8216 => ['`'],
8217 => ['\''],
8220 => ['``'],
8221 => ['\'\''],
8224 => ['\dag'],
8225 => ['\ddag'],
8240 => ['\permil', 'wasysym'],
8364 => ['\euro', 'eurosym'],
8249 => ['\guilsinglleft'],
8250 => ['\guilsinglright'],
8218 => ['\quotesinglbase', 'mathcomp'],
8222 => ['\quotedblbase', 'mathcomp'],
402 => ['\textflorin', 'mathcomp'],
381 => ['\v{Z}'],
382 => ['\v{z}'],
160 => ['\nolinebreak'],
161 => ['\textexclamdown'],
163 => ['\pounds'],
164 => ['\currency', 'wasysym'],
165 => ['\textyen', 'textcomp'],
166 => ['\brokenvert', 'wasysym'],
167 => ['\S'],
171 => ['\guillemotleft'],
187 => ['\guillemotright'],
174 => ['\textregistered'],
170 => ['\textordfeminine'],
172 => ['$\neg$'],
176 => ['$\degree$', 'mathabx'],
177 => ['$\pm$'],
180 => ['\''],
181 => ['$\mu$'],
182 => ['\P'],
183 => ['$\cdot$'],
186 => ['\textordmasculine'],
162 => ['\cent', 'wasysym'],
185 => ['$^1$'],
178 => ['$^2$'],
179 => ['$^3$'],
189 => ['$\frac{1}{2}$'],
188 => ['$\frac{1}{4}$'],
190 => ['$\frac{3}{4}'],
192 => ['\`A'],
193 => ['\\\'A'],
194 => ['\^A'],
195 => ['\~A'],
196 => ['\"A'],
197 => ['\AA'],
198 => ['\AE'],
199 => ['\cC'],
200 => ['\`E'],
201 => ['\\\'E'],
202 => ['\^E'],
203 => ['\"E'],
204 => ['\`I'],
205 => ['\\\'I'],
206 => ['\^I'],
207 => ['\"I'],
208 => ['$\eth$', 'amssymb'],
209 => ['\~N'],
210 => ['\`O'],
211 => ['\\\'O'],
212 => ['\^O'],
213 => ['\~O'],
214 => ['\"O'],
215 => ['$\times$'],
216 => ['\O'],
217 => ['\`U'],
218 => ['\\\'U'],
219 => ['\^U'],
220 => ['\"U'],
221 => ['\\\'Y'],
222 => ['\Thorn', 'wasysym'],
223 => ['\ss'],
224 => ['\`a'],
225 => ['\\\'a'],
226 => ['\^a'],
227 => ['\~a'],
228 => ['\"a'],
229 => ['\aa'],
230 => ['\ae'],
231 => ['\cc'],
232 => ['\`e'],
233 => ['\\\'e'],
234 => ['\^e'],
235 => ['\"e'],
236 => ['\`i'],
237 => ['\\\'i'],
238 => ['\^i'],
239 => ['\"i'],
240 => ['$\eth$'],
241 => ['\~n'],
242 => ['\`o'],
243 => ['\\\'o'],
244 => ['\^o'],
245 => ['\~o'],
246 => ['\"o'],
247 => ['$\divide$'],
248 => ['\o'],
249 => ['\`u'],
250 => ['\\\'u'],
251 => ['\^u'],
252 => ['\"u'],
253 => ['\\\'y'],
254 => ['\thorn', 'wasysym'],
255 => ['\"y'],
}
ENTITY_CONV_TABLE.each {|k,v| ENTITY_CONV_TABLE[k] = v.unshift(v.shift + '{}')}
def convert_entity(el, opts)
text, package = ENTITY_CONV_TABLE[el.value.code_point]
if text
@doc.conversion_infos[:packages] << package if package
text
else
@doc.warnings << "Couldn't find entity in substitution table!"
''
end
end
TYPOGRAPHIC_SYMS = {
:mdash => '---', :ndash => '--', :hellip => '\ldots{}',
:laquo_space => '\guillemotleft{}~', :raquo_space => '~\guillemotright{}',
:laquo => '\guillemotleft{}', :raquo => '\guillemotright{}'
}
def convert_typographic_sym(el, opts)
TYPOGRAPHIC_SYMS[el.value]
end
SMART_QUOTE_SYMS = {:lsquo => '`', :rsquo => '\'', :ldquo => '``', :rdquo => '\'\''}
def convert_smart_quote(el, opts)
SMART_QUOTE_SYMS[el.value]
end
def convert_math(el, opts)
@doc.conversion_infos[:packages] += %w[amssymb amsmath amsthm amsfonts]
if el.options[:category] == :block
if el.value =~ /\A\s*\\begin\{/
el.value
else
latex_environment('displaymath', el, el.value)
end
else
"$#{el.value}$"
end
end
def convert_abbreviation(el, opts)
el.value
end
ESCAPE_MAP = {
"^" => "\\^{}",
"\\" => "\\textbackslash{}",
"~" => "\\ensuremath{\\sim}",
"|" => "\\textbar{}",
"<" => "\\textless{}",
">" => "\\textgreater{}"
}.merge(Hash[*("{}$%&_#".scan(/./).map {|c| [c, "\\#{c}"]}.flatten)])
ESCAPE_RE = Regexp.union(*ESCAPE_MAP.collect {|k,v| k})
def escape(str)
str.gsub(ESCAPE_RE) {|m| ESCAPE_MAP[m]}
end
def attribute_list(el)
attrs = (el.options[:attr] || {}).map {|k,v| v.nil? ? '' : " #{k}=\"#{v.to_s}\""}.compact.sort.join('')
attrs = " % #{attrs}" if !attrs.empty?
attrs
end
end
end
end