Annotation of rat/lonsequence.pm, revision 1.8
1.1 www 1: # The LearningOnline Network with CAPA
2: #
3: # Sequence Handler
4: #
1.8 ! www 5: # $Id: lonsequence.pm,v 1.7 2002/04/02 21:17:34 www Exp $
1.5 www 6: #
7: # Copyright Michigan State University Board of Trustees
8: #
9: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
10: #
11: # LON-CAPA is free software; you can redistribute it and/or modify
12: # it under the terms of the GNU General Public License as published by
13: # the Free Software Foundation; either version 2 of the License, or
14: # (at your option) any later version.
15: #
16: # LON-CAPA is distributed in the hope that it will be useful,
17: # but WITHOUT ANY WARRANTY; without even the implied warranty of
18: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19: # GNU General Public License for more details.
20: #
21: # You should have received a copy of the GNU General Public License
22: # along with LON-CAPA; if not, write to the Free Software
23: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
24: #
25: # /home/httpd/html/adm/gpl.txt
26: #
27: # http://www.lon-capa.org/
28: #
1.1 www 29: # (Handler to resolve ambiguous file locations
30: #
31: # (TeX Content Handler
32: #
33: # 05/29/00,05/30,10/11 Gerd Kortemeyer)
34: #
35: # 10/11,10/12 Gerd Kortemeyer)
36: #
37: # 10/16 Gerd Kortemeyer
38:
1.3 www 39: package Apache::lonsequence;
1.1 www 40:
41: use strict;
42: use Apache::lonnet;
1.3 www 43: use Apache::Constants qw(:common :http REDIRECT);
1.1 www 44: use GDBM_File;
1.8 ! www 45: use Apache::lonratedt;
! 46: use Apache::lonratsrv;
1.1 www 47:
48: # ----------------------------------------------------------- Could not resolve
49:
50: sub getlost {
51: my ($r,$errmsg)=@_;
52: $r->content_type('text/html');
53: $r->send_http_header;
54: $r->print(
55: '<head><title>Unknown Error</title></head><body bgcolor="#FFFFFF"><h1>'.
1.3 www 56: 'LON-CAPA</h1>Could not handle sequence resource reference.<p>'.$errmsg.
1.1 www 57: '</body></html>');
58: }
59:
1.8 ! www 60:
! 61: # ----------------------------------------- Attempt to read from resource space
! 62:
! 63: sub attemptread {
! 64: my $fn=shift;
! 65: &Apache::lonnet::repcopy($fn);
! 66: if (-e $fn) {
! 67: return &Apache::lonratedt::attemptread($fn);
! 68: } else {
! 69: return ();
! 70: }
! 71: }
! 72:
! 73: # ---------------------------------------------------------------- View Handler
! 74:
! 75: sub viewmap {
! 76: my ($r,$url,$adv,$errtext)=@_;
! 77: $r->print('<html>');
! 78: if ($ENV{'form.forceselect'}) { $r->print(<<ENDSCRIPT);
! 79: <script>
! 80:
! 81: function select_group() {
! 82: window.location="/adm/groupsort?catalogmode=groupimport&mode=rat&acts="+document.forms.fileattr.acts.value;
! 83: }
! 84:
! 85: function queue(val) {
! 86: if (eval("document.forms."+val+".filelink.checked")) {
! 87: var l=val.length;
! 88: var v=val.substring(4,l);
! 89: document.forms.fileattr.acts.value+='1a'+v+'b';
! 90: }
! 91: else {
! 92: var l=val.length;
! 93: var v=val.substring(4,l);
! 94: document.forms.fileattr.acts.value+='0a'+v+'b';
! 95: }
! 96: }
! 97:
! 98:
! 99:
! 100: </script>
! 101: ENDSCRIPT
! 102: }
! 103: $r->print('<body bgcolor="#FFFFFF">'.&buttons($adv));
! 104: if ($ENV{'form.forceselect'}) { $r->print(<<ENDSELECT);
! 105: <form name=fileattr><input type=hidden name=acts value=''>
! 106: <input type="button" name="close" value='CLOSE' onClick="self.close()">
! 107: <input type="button" name="groupimport" value='GROUP IMPORT'
! 108: onClick="javascript:select_group()">
! 109: </form>
! 110: ENDSELECT
! 111: }
! 112: if ($errtext) {
! 113: $r->print($errtext.'<hr>');
! 114: }
! 115: my $idx=0;
! 116: foreach (&attemptread(&Apache::lonnet::filelocation('',$url))) {
! 117: if (defined($_)) {
! 118: $idx++;
! 119: if ($ENV{'form.forceselect'}) {
! 120: $r->print('<form name="form'.$idx.'">');
! 121: }
! 122: my ($title,$url)=split(/\:/,$_);
! 123: $title=~s/\&colon\;/\:/g;
! 124: $url=~s/\&colon\;/\:/g;
! 125: unless ($title) { $title=(split(/\//,$url))[-1] };
! 126: unless ($title) { $title='<i>Empty</i>'; }
! 127: if ($url) {
! 128: if ($ENV{'form.forceselect'}) {
! 129: $r->print(<<ENDCHECKBOX);
! 130: <input type='checkbox' name='filelink'
! 131: value='$url' onClick='javascript:queue("form$idx")' >
! 132: <input type='hidden' name='title' value='$title'>
! 133: ENDCHECKBOX
! 134: }
! 135: $r->print('<a href="'.&Apache::lonratsrv::qtescape($url).'">');
! 136: }
! 137: $r->print(&Apache::lonratsrv::qtescape($title));
! 138: if ($url) { $r->print('</a>'); }
! 139: if ($ENV{'form.forceselect'}) {
! 140: $r->print('</form>');
! 141: } else {
! 142: $r->print('<br>');
! 143: }
! 144: }
! 145: }
! 146: $r->print('</body></html>');
! 147: }
! 148:
1.1 www 149: # ================================================================ Main Handler
150:
151: sub handler {
152: my $r=shift;
153:
154: if ($r->header_only) {
155: $r->content_type('text/html');
156: $r->send_http_header;
157: return OK;
158: }
1.8 ! www 159:
! 160: &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},
! 161: ['forceselect']);
1.1 www 162:
1.2 www 163: my %hash;
1.1 www 164: my %bighash;
1.2 www 165: my $requrl=$r->uri;
166:
1.3 www 167: # ------------------------------------------------------------ Tie symb db file
1.1 www 168: if ($ENV{'request.course.fn'}) {
1.2 www 169: my $last;
170: if (tie(%hash,'GDBM_File',$ENV{'request.course.fn'}.'_symb.db',
171: &GDBM_READER,0640)) {
172: $last=$hash{'last_direction'};
173: untie(%hash);
174: }
1.3 www 175: my $direction='';
176: my $prevmap='';
177: if ($last) {
178: ($prevmap,$direction)=(split(/\_\_\_/,$last));
179: }
180: # ------------------------------------------------------------- Tie big db file
1.1 www 181: if (tie(%bighash,'GDBM_File',$ENV{'request.course.fn'}.'.db',
182: &GDBM_READER,0640)) {
1.3 www 183: my $disid='';
1.4 www 184: my $whatend='';
1.3 www 185: if ($direction eq 'back') {
186: $disid=$bighash{'map_finish_'.$requrl};
1.4 www 187: $whatend='End';
1.3 www 188: } else {
189: $disid=$bighash{'map_start_'.$requrl};
1.4 www 190: $whatend='Beginning';
1.3 www 191: }
192: my $disurl='';
1.4 www 193: my $dismapid='';
1.3 www 194: if ($disid) {
195: $disurl=$bighash{'src_'.$disid};
1.4 www 196: $dismapid=(split(/\./,$disid))[1];
1.3 www 197: }
198: my $symb='';
1.4 www 199: my $sequencetitle='';
1.3 www 200: unless($disurl) {
201: if ($symb=&Apache::lonnet::symbread()) {
1.4 www 202: my ($mapurl,$mapid)=split(/\_\_\_/,$symb);
203: $sequencetitle=$bighash{'title_'.
204: $bighash{'map_pc_/res/'.$mapurl}.'.'.
205: $mapid};
1.3 www 206: }
207: }
208: # --------------------------------------- Untie hash, make sure to come by here
209: untie(%bighash);
210: if ($disurl) {
211: # -------------------------------------------------- Has first or last resource
1.7 www 212: &Apache::lonnet::symblist($requrl,$disurl => $dismapid,
213: 'last_known' => &Apache::lonnet::declutter($disurl));
1.3 www 214: $r->content_type('text/html');
215: $r->header_out(Location => 'http://'.$ENV{'HTTP_HOST'}.$disurl);
216: return REDIRECT;
217: } else {
218: # ---------- Does not have first or last resource, try to find out where we are
219: unless ($symb) {
220: $r->internal_redirect('/adm/ambiguous');
221: }
222: $r->content_type('text/html');
223: $r->send_http_header;
224: $r->print(<<ENDSYMB);
1.4 www 225: <html><body bgcolor="#FFFFFF">
226: <h2>$whatend of</h2>
227: <h1>$sequencetitle</h1>
1.3 www 228: </body></html>
229: ENDSYMB
230: return OK
1.2 www 231: }
1.1 www 232: } else {
233: &getlost($r,'Could not access course structure.');
234: return OK;
235: }
236: } else {
237: $ENV{'user.error.msg'}="$requrl:bre:0:0:Course not initialized";
238: return HTTP_NOT_ACCEPTABLE;
239: }
240:
241: return OK;
242: }
243:
244: 1;
245: __END__
246:
247:
248:
249:
250:
251:
252:
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