Annotation of loncom/interface/lonhelp.pm, revision 1.20
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.
1.20 ! www 46:
! 47: sub processLabelName {
1.1 bowersj2 48: my ($name) = @_;
49: $name =~ tr/a-zA-Z0-9/_/cs;
50: return $name;
51: }
52:
1.20 ! www 53: # Serve out the text
! 54: sub servetext {
! 55: my ($r,$text) = @_;
1.16 albertel 56: my $html=&Apache::lonxml::xmlbegin();
1.20 ! www 57: my $htmlend=&Apache::lonxml::xmlend();
1.14 www 58: my $bugs=&Apache::loncommon::help_open_bug('Documentation');
59: my $header=&mt('LON-CAPA Help');
1.16 albertel 60: $r->print(<<HEADER);
61: $html
1.1 bowersj2 62: <head>
63: <title>LON-CAPA Help</title>
64: </head>
65: <body bgcolor="#FFFFFF">
1.4 bowersj2 66: <h3 style="font: sans-serif"><img align="right"
1.14 www 67: src="/adm/help/gif/lonhelpheader.gif"/>$header<hr />$bugs</h3>
1.2 bowersj2 68: <!-- BEGIN -->
1.1 bowersj2 69: HEADER
70:
1.20 ! www 71: $r->print($text);
1.1 bowersj2 72:
1.19 albertel 73: if (&Apache::lonnavmaps::advancedUser()) {
1.20 ! www 74: my $search=&mt('Search LON-CAPA help');
! 75: my $about=&mt('About LON-CAPA help and More Help');
! 76: $r->print(<<FOOTER);
1.2 bowersj2 77: <!-- END -->
1.20 ! www 78: <hr /><form method="post">
! 79: $search: <input type="text" name="searchterm" size="40" /><br />
! 80: <a href="/adm/help/abouthelp.html">$about</a>
1.1 bowersj2 81: </body>
1.20 ! www 82: $htmlend
1.1 bowersj2 83: FOOTER
1.20 ! www 84: }
! 85: $r->print(<<ENDBODY);
1.9 bowersj2 86: <!-- END -->
87: </body>
1.20 ! www 88: $htmlend
! 89: ENDBODY
1.1 bowersj2 90: }
91:
92: # Render takes a tex fragment, transforms it for TtH, and returns the
93: # HTML equivalent
1.20 ! www 94: sub render {
1.2 bowersj2 95: my ($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) .
1.20 ! www 112: '.hlp#' . &processLabelName($1) .
1.2 bowersj2 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:
1.20 ! www 145: sub handler {
1.1 bowersj2 146: my $r = shift;
147:
1.2 bowersj2 148: my $docroot = $r->dir_config('lonDocRoot');
149: my $serverroot = $ENV{'HTTP_HOST'};
150:
1.12 www 151: my $filenames = &Apache::lonnet::unescape(substr ($ENV{'REQUEST_URI'} ,
152: rindex($ENV{'REQUEST_URI'}, '/') + 1, -4));
1.19 albertel 153:
1.1 bowersj2 154: # Security check on the file; the whole filename must consist
155: # of nothing but alphanums, ' ,, or ., or the file
156: # will be "not found", no matter what.
157:
1.7 bowersj2 158: return HTTP_NOT_FOUND if ($filenames !~ /\A[-0-9a-zA-z_'',:.]+\Z/);
1.1 bowersj2 159:
1.10 www 160: &Apache::lonlocal::get_language_handle($r);
161:
1.6 bowersj2 162: # Join together the tex files, return HTTP_NOT_FOUND if any of
163: # them are not found
164: my $tex = '';
1.7 bowersj2 165: # Since in insertlist.tab I want to specify multiple files,
166: # and insertlist.tab also uses commas, I need something else
1.8 bowersj2 167: # so replace : with ,
1.7 bowersj2 168: $filenames =~ s/:/,/g;
1.6 bowersj2 169: my @files = split(/,/, $filenames);
170:
171: for my $filename (@files) {
1.11 albertel 172: if (-e $docroot.'/adm/help/tex/'.
173: &Apache::lonlocal::current_language().'/'.
174: $filename.'.tex') {
175: $filename=&Apache::lonlocal::current_language().'/'.$filename;
1.10 www 176: }
1.6 bowersj2 177: (my $file = Apache::File->new($docroot
178: . '/adm/help/tex/'.$filename.'.tex'))
179: or return HTTP_NOT_FOUND;
180: $tex .= join('', <$file>);
181: }
1.5 albertel 182:
1.18 albertel 183: if ($env{'browser.mathml'}) {
1.10 www 184: &Apache::loncommon::content_type($r,'text/xml');
1.5 albertel 185: &tth::ttminit();
1.18 albertel 186: if ($env{'browser.unicode'}) {
1.5 albertel 187: &tth::ttmoptions('-L -u1');
188: } else {
189: &tth::ttmoptions('-L -u0');
190: }
191: } else {
1.10 www 192: &Apache::loncommon::content_type($r,"text/html");
1.5 albertel 193: &tth::tthinit();
1.18 albertel 194: if ($env{'browser.unicode'}) {
1.5 albertel 195: &tth::tthoptions('-L -u1');
196: } else {
197: &tth::tthoptions('-L -u0');
198: }
199: }
200:
1.13 www 201: $r->send_http_header;
1.20 ! www 202: my $text = &render($tex, $docroot, $serverroot);
! 203: &servetext($r,$text);
1.1 bowersj2 204: return OK;
205: }
206:
207: 1;
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