Annotation of loncom/interface/lonhelp.pm, revision 1.18
1.1 bowersj2 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);
1.5 albertel 34: use Apache::File();
35: use Apache::loncommon();
36: use Apache::lonacc();
37: use Apache::lontexconvert();
1.9 bowersj2 38: use Apache::lonnavmaps; # for advancedUser
1.11 albertel 39: use Apache::lonlocal;
1.18 ! albertel 40: use Apache::lonnet;
1.5 albertel 41: use tth();
42: use GDBM_File();
1.1 bowersj2 43:
44: # This sub takes the name of a label in, and converts it to something
45: # that is a valid anchor name.
46: sub processLabelName
47: {
48: my ($name) = @_;
49: $name =~ tr/a-zA-Z0-9/_/cs;
50: return $name;
51: }
52:
53: # Serve out the Tex
54: sub serveTex
55: {
56: my ($tex, $r) = @_;
1.16 albertel 57: my $html=&Apache::lonxml::xmlbegin();
1.14 www 58: my $bugs=&Apache::loncommon::help_open_bug('Documentation');
59: my $header=&mt('LON-CAPA Help');
60: my $footer=&mt('About LON-CAPA help and More Help');
1.16 albertel 61: $r->print(<<HEADER);
62: $html
1.1 bowersj2 63: <head>
64: <title>LON-CAPA Help</title>
65: </head>
66: <body bgcolor="#FFFFFF">
1.4 bowersj2 67: <h3 style="font: sans-serif"><img align="right"
1.14 www 68: src="/adm/help/gif/lonhelpheader.gif"/>$header<hr />$bugs</h3>
1.2 bowersj2 69: <!-- BEGIN -->
1.1 bowersj2 70: HEADER
71:
72: $r->print($tex);
73:
1.9 bowersj2 74: if (Apache::lonnavmaps::advancedUser()) {
1.1 bowersj2 75: $r->print(<<FOOTER);
1.2 bowersj2 76: <!-- END -->
1.4 bowersj2 77: <hr />
1.14 www 78: <center><font size="-1"><a href="/adm/help/abouthelp.html">$footer</a></font></center>
1.1 bowersj2 79: </body>
80: </html>
81: FOOTER
1.9 bowersj2 82: } else {
83: $r->print(<<FOOTER);
84: <!-- END -->
85: </body>
86: </html>
87: FOOTER
88: }
1.1 bowersj2 89: }
90:
91: # Render takes a tex fragment, transforms it for TtH, and returns the
92: # HTML equivalent
93: sub render
94: {
1.2 bowersj2 95: my ($tex, $docroot, $serverroot) = @_;
96: tie (my %fragmentLabels, 'GDBM_File', $docroot . '/adm/help/fragmentLabels.gdbm', 0, 0);
1.1 bowersj2 97:
98: # This tells TtH what to do with captions, labels, and other
99: # things
100: $tex = "\\documentclass{article}\n" . $tex;
101:
102: # We process these ourselves because TtH can't handle then without
103: # LaTeX .aux files
1.2 bowersj2 104: # absolute paths for use with help.loncapa.org
1.1 bowersj2 105: $tex =~ s| \\ref\{([^}]*)\}
1.15 albertel 106: |
107: if (not(exists($fragmentLabels{$1}))) {
108: &Apache::lonnet::logthis("ERROR: $1 not a valid help label");
109: };
110: '\\begin{html}<a href="http://' . $serverroot ."/adm/help/".
1.1 bowersj2 111: substr($fragmentLabels{$1}, 0, -4) .
1.2 bowersj2 112: '.hlp#' . processLabelName($1) .
113: '"><img src="http://' . $serverroot . '/adm/help/gif/smallHelp.gif" border="0" /></a>' .
114: '\\end{html}'
1.1 bowersj2 115: |gxe;
116:
1.3 bowersj2 117: # Backslashes
118: $tex =~ s|\\textbackslash|###BACKSLASH###|g;
119:
1.1 bowersj2 120: # Figures leftover without captions
121: $tex =~ s| \\includegraphics(\[[^]]*\])*\{([^}]*)\}
1.2 bowersj2 122: | '\\begin{html}<img src="http://' . $serverroot . '/adm/help/gif/' . $2 . '.gif" border="2"'.
1.1 bowersj2 123: ' bordercolor="#000000"/>\\end{html}'
124: |gxe;
125:
1.3 bowersj2 126:
1.17 albertel 127: $tex=&Apache::lontexconvert::tth_converted(\$tex);
1.5 albertel 128:
1.3 bowersj2 129: # Finish backslashes
130: $tex =~ s/###BACKSLASH###/'\\'/ge;
131:
132: # Fix the pretty quotes
133: $tex =~ s/('')|(``)/"/g; #" to get emacs syntax highlighter happy
1.1 bowersj2 134:
135: # For some reason all captions come out as "Figure 0:", so
136: # just duck the issue...
137:
138: $tex =~ s/Figure 0://g;
1.5 albertel 139: $tex.=$Apache::lontexconvert::errorstring;
1.1 bowersj2 140: untie %fragmentLabels;
141:
142: return $tex;
143: }
144:
145: sub handler
146: {
147: my $r = shift;
148:
1.2 bowersj2 149: my $docroot = $r->dir_config('lonDocRoot');
150: my $serverroot = $ENV{'HTTP_HOST'};
151:
1.12 www 152: my $filenames = &Apache::lonnet::unescape(substr ($ENV{'REQUEST_URI'} ,
153: rindex($ENV{'REQUEST_URI'}, '/') + 1, -4));
1.1 bowersj2 154:
155: # Security check on the file; the whole filename must consist
156: # of nothing but alphanums, ' ,, or ., or the file
157: # will be "not found", no matter what.
158:
1.7 bowersj2 159: return HTTP_NOT_FOUND if ($filenames !~ /\A[-0-9a-zA-z_'',:.]+\Z/);
1.1 bowersj2 160:
1.10 www 161: &Apache::lonlocal::get_language_handle($r);
162:
1.6 bowersj2 163: # Join together the tex files, return HTTP_NOT_FOUND if any of
164: # them are not found
165: my $tex = '';
1.7 bowersj2 166: # Since in insertlist.tab I want to specify multiple files,
167: # and insertlist.tab also uses commas, I need something else
1.8 bowersj2 168: # so replace : with ,
1.7 bowersj2 169: $filenames =~ s/:/,/g;
1.6 bowersj2 170: my @files = split(/,/, $filenames);
171:
172: for my $filename (@files) {
1.11 albertel 173: if (-e $docroot.'/adm/help/tex/'.
174: &Apache::lonlocal::current_language().'/'.
175: $filename.'.tex') {
176: $filename=&Apache::lonlocal::current_language().'/'.$filename;
1.10 www 177: }
1.6 bowersj2 178: (my $file = Apache::File->new($docroot
179: . '/adm/help/tex/'.$filename.'.tex'))
180: or return HTTP_NOT_FOUND;
181: $tex .= join('', <$file>);
182: }
1.5 albertel 183:
1.18 ! albertel 184: if ($env{'browser.mathml'}) {
1.10 www 185: &Apache::loncommon::content_type($r,'text/xml');
1.5 albertel 186: &tth::ttminit();
1.18 ! albertel 187: if ($env{'browser.unicode'}) {
1.5 albertel 188: &tth::ttmoptions('-L -u1');
189: } else {
190: &tth::ttmoptions('-L -u0');
191: }
192: } else {
1.10 www 193: &Apache::loncommon::content_type($r,"text/html");
1.5 albertel 194: &tth::tthinit();
1.18 ! albertel 195: if ($env{'browser.unicode'}) {
1.5 albertel 196: &tth::tthoptions('-L -u1');
197: } else {
198: &tth::tthoptions('-L -u0');
199: }
200: }
201:
1.13 www 202: $r->send_http_header;
1.2 bowersj2 203: $tex = render($tex, $docroot, $serverroot);
1.1 bowersj2 204: serveTex($tex, $r);
205:
206: return OK;
207: }
208:
209: 1;
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