forked from github/kensanata.oddmuse
7ca0f6172b
Glob will split patterns on whitespace and non-breaking spaces are now treated as whitespace.
224 lines
7.8 KiB
Perl
224 lines
7.8 KiB
Perl
# Copyright (C) 2003, 2004 Alex Schroeder <alex@emacswiki.org>
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# Copyright (C) 2004 Haixing Hu <huhaixing@msn.com>
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# Copyright (C) 2004, 2005 Todd Neal <tolchz@tolchz.net>
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the
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# Free Software Foundation, Inc.
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# 59 Temple Place, Suite 330
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# Boston, MA 02111-1307 USA
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#
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# External programs needed
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# LaTeX - http://www.latex-project.org
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# TeX - http://www.tug.org/teTeX/
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#
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# And one of :
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# dvipng - http://sourceforge.net/projects/dvipng/
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# convert - http://www.imagemagick.org/
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#
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# CSS Styles:
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# span.eqCount
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# img.LaTeX
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# img.InlineMath
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# img.DisplayMath
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use File::Glob ':glob';
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use vars qw($LatexDir $LatexLinkDir $LatexExtendPath $LatexSingleDollars);
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# One of the following options must be set correctly to the full path of
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# either dvipng or convert. If both paths are set correctly, dvipng is used
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# instead of convert
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my $dvipngPath = "/usr/bin/dvipng";
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my $convertPath = "/usr/bin/convert";
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# Set $dispErrors to display LaTeX errors inline on the page.
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my $dispErrors = 1;
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# Set $useMD5 to 1 if you want to use MD5 hashes for filenames, set it to 0 to use
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# a url-encoded hash. If $useMD5 is set and the Digest::MD5 module is not available,
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# latex.pl falls back to urlencode
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my $useMD5 = 0;
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# PATH must be extended in order to make latex available along with
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# any binaries that it may need to work
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$LatexExtendPath = ':/usr/share/texmf/bin:/usr/bin:/usr/local/bin';
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# Allow single dollars signs to escape LaTeX math commands
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$LatexSingleDollars = 0;
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# Set $allowPlainTeX to 1 to allow normal LaTeX commands inside of $[ ]$
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# to be executed outside of the math environment. This should only be done
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# if your wiki is not publically editable because of the possible security risk
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$allowPlainLaTeX = 0;
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# $LatexDir must be accessible from the outside as $LatexLinkDir. The
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# first directory is used to *save* the pictures, the second directory
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# is used to produce the *link* to the pictures.
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#
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# Example: You store the images in /org/org.emacswiki/htdocs/test/latex.
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# This directory is reachable from the outside as http://www.emacswiki.org/test/latex/.
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# /org/org.emacswiki/htdocs/test is your $DataDir.
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$LatexDir = "$DataDir/latex";
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$LatexLinkDir= "/wiki/latex";
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# Text used when referencing equations with EQ(equationLabel)
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my $eqAbbrev = "Eq. ";
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# You also need a template stored as $DataDir/template.latex. The
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# template must contain the string <math> where the LaTeX code is
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# supposed to go. It will be created on the first run.
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my $LatexDefaultTemplateName = "$LatexDir/template.latex";
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$ModulesDescription .= '<p><a href="http://git.savannah.gnu.org/cgit/oddmuse.git/tree/modules/latex.pl">latex.pl</a>, see <a href="http://www.oddmuse.org/cgi-bin/oddmuse/LaTeX_Extension">LaTeX Extension</a></p>';
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# Internal Equation counting and referencing variables
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my $eqCounter = 0;
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my %eqHash;
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my $LatexDefaultTemplate = << 'EOT';
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\documentclass[12pt]{article}
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\pagestyle{empty}
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\begin{document}
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<math>
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\end{document}
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EOT
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push(@MyRules, \&LatexRule);
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sub LatexRule {
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if (m/\G\\\[(\(.*?\))?((.*\n)*?.*?)\\\]/gc) {
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my $label = $1;
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my $latex = $2;
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$label =~ s#\(?\)?##g;# Remove the ()'s from the label and convert case
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$label =~ tr/A-Z/a-z/;
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$eqCounter++;
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$eqHash{$label} = $eqCounter;
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return &MakeLaTeX("\\begin{displaymath} $latex \\end{displaymath}", "display math",$label);
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} elsif (m/\G\$\$((.*\n)*?.*?)\$\$/gc) {
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return &MakeLaTeX("\$\$ $1 \$\$", $LatexSingleDollars ? "display math" : "inline math");
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} elsif ($LatexSingleDollars and m/\G\$((.*\n)*?.*?)\$/gc) {
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return &MakeLaTeX("\$ $1 \$", "inline math");
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} elsif ($allowPlainLaTeX && m/\G\$\[((.*\n)*?.*?)\]\$/gc) { #Pick up plain LaTeX commands
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return &MakeLaTeX(" $1 ", "LaTeX");
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} elsif (m/\GEQ\((.*?)\)/gc) { # Handle references to equations
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my $label = $1;
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$label =~ tr/A-Z/a-z/;
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if ($eqHash{$label}) {
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return $eqAbbrev . "<a href=\"#$label\">". $eqHash{$label} . "</a>";
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}
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else {
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return "[ Equation $label not found ]";
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}
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}
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return undef;
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}
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sub MakeLaTeX {
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my ($latex, $type, $label) = @_;
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$ENV{PATH} .= $LatexExtendPath if $LatexExtendPath and $ENV{PATH} !~ /$LatexExtendPath/;
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# Select which binary to use for conversion of dvi to images
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my $useConvert = 0;
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if (not -e $dvipngPath) {
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if (not -e $convertPath) {
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return "[Error: dvipng binary and convert binary not found at $dvipngPath or $converPath ]";
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}
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else {
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$useConvert = 1; # Fall back on convert if dvipng is missing and convert exists
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}
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}
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$latex = UnquoteHtml($latex); # Change < back to <, for example
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# User selects which hash to use
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my $hash;
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my $hasMD5;
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if ($useMD5) { $hasMD5 = eval "require Digest::MD5;"; }
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if ($useMD5 && $hasMD5) {
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$hash = Digest::MD5::md5_base64($latex);
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$hash =~ s/\//a/g;
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} else {
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$hash = UrlEncode($latex);
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$hash =~ s/%//g;
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}
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# check cache
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if (not -f "$LatexDir/$hash.png" or -z "$LatexDir/$hash.png") { #If file doesn't exist or is zero bytes
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# Then create the image
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# read template and replace <math>
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mkdir($LatexDir) unless -d $LatexDir;
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if (not -f $LatexDefaultTemplateName) {
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open (F, "> $LatexDefaultTemplateName") or return '[Unable to write template]';
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print F $LatexDefaultTemplate;
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close (F);
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}
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my $template = ReadFileOrDie($LatexDefaultTemplateName);
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$template =~ s/<math>/$latex/ig;
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#setup rendering directory
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my $dir = "$LatexDir/$hash";
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if (-d $dir) {
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unlink (bsd_glob('$dir/*'));
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} else {
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mkdir($dir) or return "[Unable to create $dir]";
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}
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chdir ($dir) or return "[Unable to switch to $dir]";
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WriteStringToFile ("srender.tex", $template);
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my $errorText = qx(latex srender.tex);
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return "[Illegal LaTeX markup: <pre>$latex</pre>] <br/> Error: <pre>$errorText</pre>" if ($? && $dispErrors);
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return "[Illegal LaTeX markup: <pre>$latex</pre>] <br/>" if $?;
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my $output;
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# Use specified binary to convert dvi to png
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if ($useConvert) {
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$output = qx($convertPath -antialias -crop 0x0 -density 120x120 -transparent white srender.dvi srender1.png );
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return "[convert error $? ($output)]" if $?;
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} else {
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$output = qx($dvipngPath -T tight -bg Transparent srender.dvi);
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return "[dvipng error $? ($output)]" if $?;
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}
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my $result;
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if (-f 'srender1.png' and not -z 'srender1.png') {
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my $png = ReadFileOrDie("srender1.png");
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WriteStringToFile ("$LatexDir/$hash.png", $png);
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} else { $result = "[Error retrieving image for $latex]"; }
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}
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# Finally print the html for the image
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if ($type eq "inline math") { # inline math
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return ("<img class='InlineMath' "
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."src='$LatexLinkDir/$hash.png' alt='$latex'\/>");
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} elsif ($type eq "display math") { # display math
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my $ret;
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if ($label) { $ret = "<a name='$label'>"; }
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$ret .= "<center><img class='DisplayMath' "
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."src='$LatexLinkDir/$hash.png' alt='$latex'> <span class=\'eqCount\'>($eqCounter)</span><\/center>";
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return($ret);
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} else { # latex format
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return ("<img class='LaTeX' "
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."src='$LatexLinkDir/$hash.png' alt='$latex' \/>");
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}
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unlink (glob('*'));
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chdir ($LatexDir);
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rmdir ($dir);
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return $result;
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}
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