1: # The LearningOnline Network with CAPA
2: # .tex help system web server handler
3: #
4: # Copyright Michigan State University Board of Trustees
5: #
6: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
7: #
8: # LON-CAPA is free software; you can redistribute it and/or modify
9: # it under the terms of the GNU General Public License as published by
10: # the Free Software Foundation; either version 2 of the License, or
11: # (at your option) any later version.
12: #
13: # LON-CAPA is distributed in the hope that it will be useful,
14: # but WITHOUT ANY WARRANTY; without even the implied warranty of
15: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16: # GNU General Public License for more details.
17: #
18: # You should have received a copy of the GNU General Public License
19: # along with LON-CAPA; if not, write to the Free Software
20: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21: #
22: # /home/httpd/html/adm/gpl.txt
23: #
24: # http://www.lon-capa.org/
25: #
26: # .tex file help handler
27: # YEAR=2002
28: # 7/4 Jeremy Bowers
29:
30: package Apache::lonhelp;
31:
32: use strict;
33: use Apache::Constants qw(:common :http);
34: use Apache::File();
35: use Apache::loncommon();
36: use Apache::lonacc();
37: use Apache::lontexconvert();
38: use Apache::lonnavmaps; # for advancedUser
39: use tth();
40: use GDBM_File();
41:
42: # This sub takes the name of a label in, and converts it to something
43: # that is a valid anchor name.
44: sub processLabelName
45: {
46: my ($name) = @_;
47: $name =~ tr/a-zA-Z0-9/_/cs;
48: return $name;
49: }
50:
51: # Serve out the Tex
52: sub serveTex
53: {
54: my ($tex, $r) = @_;
55:
56: $r->print(<<HEADER);
57: <html>
58: <head>
59: <title>LON-CAPA Help</title>
60: </head>
61: <body bgcolor="#FFFFFF">
62: <h3 style="font: sans-serif"><img align="right"
63: src="/adm/help/gif/lonhelpheader.gif"/>LON-CAPA Help<hr /></h3>
64: <!-- BEGIN -->
65: HEADER
66:
67: $r->print($tex);
68:
69: if (Apache::lonnavmaps::advancedUser()) {
70: $r->print(<<FOOTER);
71: <!-- END -->
72: <hr />
73: <center><font size="-1"><a href="/adm/help/abouthelp.html">About
74: LON-CAPA help and More Help</a></font></center>
75: </body>
76: </html>
77: FOOTER
78: } else {
79: $r->print(<<FOOTER);
80: <!-- END -->
81: </body>
82: </html>
83: FOOTER
84: }
85: }
86:
87: # Render takes a tex fragment, transforms it for TtH, and returns the
88: # HTML equivalent
89: sub render
90: {
91: my ($tex, $docroot, $serverroot) = @_;
92: tie (my %fragmentLabels, 'GDBM_File', $docroot . '/adm/help/fragmentLabels.gdbm', 0, 0);
93:
94: # This tells TtH what to do with captions, labels, and other
95: # things
96: $tex = "\\documentclass{article}\n" . $tex;
97:
98: # We process these ourselves because TtH can't handle then without
99: # LaTeX .aux files
100: # absolute paths for use with help.loncapa.org
101: $tex =~ s| \\ref\{([^}]*)\}
102: |'\\begin{html}<a href="http://' . $serverroot ."/adm/help/".
103: substr($fragmentLabels{$1}, 0, -4) .
104: '.hlp#' . processLabelName($1) .
105: '"><img src="http://' . $serverroot . '/adm/help/gif/smallHelp.gif" border="0" /></a>' .
106: '\\end{html}'
107: |gxe;
108:
109: # Backslashes
110: $tex =~ s|\\textbackslash|###BACKSLASH###|g;
111:
112: # Figures leftover without captions
113: $tex =~ s| \\includegraphics(\[[^]]*\])*\{([^}]*)\}
114: | '\\begin{html}<img src="http://' . $serverroot . '/adm/help/gif/' . $2 . '.gif" border="2"'.
115: ' bordercolor="#000000"/>\\end{html}'
116: |gxe;
117:
118:
119: $tex=&Apache::lontexconvert::converted(\$tex);
120:
121: # Finish backslashes
122: $tex =~ s/###BACKSLASH###/'\\'/ge;
123:
124: # Fix the pretty quotes
125: $tex =~ s/('')|(``)/"/g; #" to get emacs syntax highlighter happy
126:
127: # For some reason all captions come out as "Figure 0:", so
128: # just duck the issue...
129:
130: $tex =~ s/Figure 0://g;
131: $tex.=$Apache::lontexconvert::errorstring;
132: untie %fragmentLabels;
133:
134: return $tex;
135: }
136:
137: sub handler
138: {
139: my $r = shift;
140:
141: my $docroot = $r->dir_config('lonDocRoot');
142: my $serverroot = $ENV{'HTTP_HOST'};
143:
144: my $filenames = substr ($ENV{'REQUEST_URI'} ,
145: rindex($ENV{'REQUEST_URI'}, '/') + 1, -4);
146:
147: # Security check on the file; the whole filename must consist
148: # of nothing but alphanums, ' ,, or ., or the file
149: # will be "not found", no matter what.
150:
151: return HTTP_NOT_FOUND if ($filenames !~ /\A[-0-9a-zA-z_'',:.]+\Z/);
152:
153: # Join together the tex files, return HTTP_NOT_FOUND if any of
154: # them are not found
155: my $tex = '';
156: # Since in insertlist.tab I want to specify multiple files,
157: # and insertlist.tab also uses commas, I need something else
158: # so replace : with ,
159: $filenames =~ s/:/,/g;
160: my @files = split(/,/, $filenames);
161:
162: for my $filename (@files) {
163: (my $file = Apache::File->new($docroot
164: . '/adm/help/tex/'.$filename.'.tex'))
165: or return HTTP_NOT_FOUND;
166: $tex .= join('', <$file>);
167: }
168:
169: # get me my environment if it exists
170: &Apache::lonacc::handler($r);
171:
172: if ($ENV{'browser.mathml'}) {
173: $r->content_type('text/xml');
174: &tth::ttminit();
175: if ($ENV{'browser.unicode'}) {
176: &tth::ttmoptions('-L -u1');
177: } else {
178: &tth::ttmoptions('-L -u0');
179: }
180: } else {
181: $r->content_type("text/html");
182: &tth::tthinit();
183: if ($ENV{'browser.unicode'}) {
184: &tth::tthoptions('-L -u1');
185: } else {
186: &tth::tthoptions('-L -u0');
187: }
188: }
189:
190: $tex = render($tex, $docroot, $serverroot);
191: serveTex($tex, $r);
192:
193: return OK;
194: }
195:
196: 1;
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