1: # The LearningOnline Network with CAPA
2: #
3: # Sequence Handler
4: #
5: # $Id: lonsequence.pm,v 1.23 2005/03/01 00:22:57 albertel Exp $
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: #
29: # (Handler to resolve ambiguous file locations
30: #
31:
32: package Apache::lonsequence;
33:
34: use strict;
35: use Apache::lonnet;
36: use Apache::Constants qw(:common :http REDIRECT);
37: use GDBM_File;
38: use Apache::lonratedt;
39: use Apache::lonratsrv;
40: use Apache::lonpageflip;
41: use Apache::loncommon;
42: use Apache::lonlocal;
43:
44: my %selhash;
45: my $successtied;
46:
47: # ----------------------------------------- Attempt to read from resource space
48:
49: sub attemptread {
50: my $fn=shift;
51: &Apache::lonnet::repcopy($fn);
52: if (-e $fn) {
53: return &Apache::lonratedt::attemptread($fn);
54: } else {
55: return ();
56: }
57: }
58:
59: sub mapread {
60: my $fn=shift;
61: &Apache::lonnet::repcopy($fn);
62: if (-e $fn) {
63: return &Apache::lonratedt::mapread($fn,'');
64: } else {
65: return ();
66: }
67: }
68:
69: # ---------------------------------------------------------------- View Handler
70:
71: sub viewmap {
72: my ($r,$url)=@_;
73: $r->print('<html>');
74: if ($ENV{'form.forceselect'}) { $r->print(<<ENDSCRIPT);
75: <script>
76:
77: function select_group() {
78: window.location="/adm/groupsort?catalogmode=groupsec&mode=rat&acts="+document.forms.fileattr.acts.value;
79: }
80:
81: function queue(val) {
82: if (eval("document.forms."+val+".filelink.checked")) {
83: var l=val.length;
84: var v=val.substring(4,l);
85: document.forms.fileattr.acts.value+='1a'+v+'b';
86: }
87: else {
88: var l=val.length;
89: var v=val.substring(4,l);
90: document.forms.fileattr.acts.value+='0a'+v+'b';
91: }
92: }
93:
94: </script>
95: ENDSCRIPT
96: }
97: $r->print(&Apache::loncommon::bodytag('Map Contents').'<h1>'.$url.'</h1>');
98: # ------------------ This is trying to select. Provide buttons and tie %selhash
99: if ($ENV{'form.forceselect'}) { $r->print(<<ENDSELECT);
100: <form name=fileattr><input type=hidden name=acts value=''>
101: <input type="button" name="close" value='CLOSE' onClick="self.close()">
102: <input type="button" name="groupimport" value='GROUP IMPORT'
103: onClick="javascript:select_group()">
104: </form>
105: ENDSELECT
106: my $diropendb =
107: "/home/httpd/perl/tmp/$ENV{'user.domain'}\_$ENV{'user.name'}_groupsec.db";
108: if (tie(%selhash,'GDBM_File',$diropendb,&GDBM_WRCREAT(),0640)) {
109: if ($ENV{'form.launch'} eq '1') {
110: &start_fresh_session();
111: }
112: $successtied=1;
113:
114: # - Evaluate actions from previous page (both cumulatively and chronologically)
115: if ($ENV{'form.catalogmode'} eq 'groupimport') {
116: my $acts=$ENV{'form.acts'};
117: my @Acts=split(/b/,$acts);
118: my %ahash;
119: my %achash;
120: my $ac=0;
121: # some initial hashes for working with data
122: foreach (@Acts) {
123: my ($state,$ref)=split(/a/);
124: $ahash{$ref}=$state;
125: $achash{$ref}=$ac;
126: $ac++;
127: }
128: # sorting through the actions and changing the tied database hash
129: foreach (sort {$achash{$a}<=>$achash{$b}} (keys %ahash)) {
130: my $key=$_;
131: if ($ahash{$key} eq '1') {
132: $selhash{'store_'.$selhash{'pre_'.$key.'_link'}}=
133: $selhash{'pre_'.$key.'_title'};
134: $selhash{'storectr_'.$selhash{'pre_'.$key.'_link'}}=
135: $selhash{'storectr'}+0;
136: $selhash{'storectr'}++;
137: }
138: if ($ahash{$key} eq '0') {
139: if ($selhash{'store_'.$selhash{'pre_'.$key.'_link'}}) {
140: delete $selhash{'store_'.$selhash{'pre_'.$key.'_link'}};
141: }
142: }
143: }
144: # deleting the previously cached listing
145: foreach (keys %selhash) {
146: if ($_ =~ /^pre_/ && $_ =~/link$/) {
147: my $key = $_;
148: $key =~ s/^pre_//;
149: $key =~ s/_[^_]*$//;
150: delete $selhash{'pre_'.$key.'_title'};
151: delete $selhash{'pre_'.$key.'_link'};
152: }
153: }
154: }
155: # -
156: }
157: }
158: # ----------------------------- successtied is now '1' if in working selectmode
159: my ($errtext,$fatal)=&mapread(&Apache::lonnet::filelocation('',$url),'');
160: if ($fatal==1) {
161: $r->print('<p><b><font color="red">'.&mt('Map contents are not shown in order.').'</font></b></p><br />');
162: }
163: my $idx=0;
164: foreach (&attemptread(&Apache::lonnet::filelocation('',$url))) {
165: if (defined($_)) {
166: $idx++;
167: if ($successtied) {
168: $r->print('<form name="form'.$idx.'">');
169: }
170: my ($title,$url)=split(/\:/,$_);
171: $title=~s/\&colon\;/\:/g;
172: $url=~s/\&colon\;/\:/g;
173: unless ($title) { $title=(split(/\//,$url))[-1] };
174: unless ($title) { $title='<i>'.&mt('Empty').'</i>'; }
175: if ($url) {
176: if ($successtied) {
177: my $checked='';
178: if ($selhash{'store_'.$url}) {
179: $checked=" checked";
180: }
181: $selhash{"pre_${idx}_link"}=$url;
182: $selhash{"pre_${idx}_title"}=$title;
183:
184: $r->print(<<ENDCHECKBOX);
185: <input type='checkbox' name='filelink'
186: value='$url' onClick='javascript:queue("form$idx")'$checked>
187: <input type='hidden' name='title' value='$title'>
188: ENDCHECKBOX
189: }
190: $r->print('<a href="'.&Apache::lonratsrv::qtescape($url).'">');
191: }
192: $r->print(&Apache::lonratsrv::qtescape($title));
193: if ($url) { $r->print('</a>'); }
194: if ($successtied) {
195: $r->print('</form>');
196: } else {
197: $r->print('<br>');
198: }
199: }
200: }
201: $r->print('</body></html>');
202: if ($successtied) {
203: untie %selhash;
204: }
205: }
206:
207: # ----------------------------------------------------------- Clean out selhash
208: sub start_fresh_session {
209: foreach (keys %selhash) {
210: if ($_ =~ /^pre_/) {
211: delete $selhash{$_};
212: }
213: if ($_ =~ /^store/) {
214: delete $selhash{$_};
215: }
216: }
217: }
218:
219:
220: # ================================================================ Main Handler
221:
222: sub handler {
223: my $r=shift;
224:
225: if ($r->header_only) {
226: &Apache::loncommon::content_type($r,'text/html');
227: $r->send_http_header;
228: return OK;
229: }
230:
231: &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},
232: ['forceselect','launch']);
233:
234: my %hash;
235: my %bighash;
236: my $requrl=$r->uri;
237:
238: $successtied=0;
239: # ------------------------------------------------------------ Tie symb db file
240: my $disurl='';
241: my $dismapid='';
242: my $exitdisid = '';
243: my $arrow_dir = '';
244:
245: if (($ENV{'request.course.fn'}) && (!$ENV{'form.forceselect'})) {
246: my $last;
247: if (tie(%hash,'GDBM_File',$ENV{'request.course.fn'}.'_symb.db',
248: &GDBM_READER(),0640)) {
249: $last=$hash{'last_direction'};
250: untie(%hash);
251: }
252: my $direction='';
253: my $prevmap='';
254: if ($last) {
255: ($prevmap,undef,$direction)=&Apache::lonnet::decode_symb($last);
256: }
257: # ------------------------------------------------------------- Tie big db file
258: if (tie(%bighash,'GDBM_File',$ENV{'request.course.fn'}.'.db',
259: &GDBM_READER(),0640)) {
260: my $disid='';
261: my $randomout ='';
262:
263: if ($direction eq 'back') {
264: $disid=$bighash{'map_finish_'.$requrl};
265: } else {
266: $disid=$bighash{'map_start_'.$requrl};
267: }
268: if ($disid) {
269: $disurl=$bighash{'src_'.$disid};
270: $dismapid=(split(/\./,$disid))[1];
271: $randomout = $bighash{'randomout_'.$disid};
272: } elsif (tie(%hash,'GDBM_File',$ENV{'request.course.fn'}.'_symb.db',
273: &GDBM_READER(),0640)) {
274: $last=$hash{'last_known'};
275: untie(%hash);
276: }
277:
278:
279: # ----------- If this is an empty one, or hidden, skip to next non-empty or non-hidden one
280: while ( ((!$disurl) && ($disid)) || ($randomout && $disid) ) {
281: $direction=($direction?$direction:'forward');
282: ($disid,$requrl)=
283: &Apache::lonpageflip::fullmove($disid,
284: &Apache::lonnet::declutter($requrl),$direction);
285: if ($disid) {
286: $disurl=$bighash{'src_'.$disid};
287: $dismapid=(split(/\./,$disid))[1];
288: $randomout = $bighash{'randomout_'.$disid};
289: }
290: }
291: $exitdisid = $disid;
292: $arrow_dir = $direction;
293:
294: # --------------------------------------- Untie hash, make sure to come by here
295: untie(%bighash);
296: }
297: }
298:
299: # now either disurl is set (going to first page), or we need another display
300: if ($disurl) {
301: # -------------------------------------------------- Has first or last resource
302: &Apache::lonnet::symblist($requrl,$disurl => [$disurl,$dismapid],
303: 'last_known' => [$disurl,$dismapid]);
304: &Apache::loncommon::content_type($r,'text/html');
305: $r->header_out(Location => 'http://'.$ENV{'HTTP_HOST'}.$disurl);
306: return REDIRECT;
307: } else {
308: &Apache::loncommon::content_type($r,'text/html');
309: $r->send_http_header;
310: if ($exitdisid eq '' && $arrow_dir ne '') {
311: my %lt =&Apache::lonlocal::texthash(
312: 'back' => 'beginning',
313: 'forward' => 'end',
314: 'emfo' => 'Empty Folder/Sequence',
315: 'nere' => 'Next resource could not be displayed',
316: 'goba' => 'Go Back',
317: 'nacc' => 'Navigate Course Content',
318: );
319: my $warnmsg = 'As all folders and sequences ';
320: if ($arrow_dir eq 'forward') {
321: $warnmsg .= &mt('following the current resource were empty').',';
322: } elsif ($arrow_dir eq 'back') {
323: $warnmsg .= &mt('preceding the current resource were empty').',';
324: }
325: $warnmsg .= &mt('you have now reached the').' '.$lt{$arrow_dir}.' '.&mt('of the course.');
326: my $bodytag=&Apache::loncommon::bodytag('Empty Folder/Sequence');
327: $r->print(<<ENDNONE);
328: <head><title>$lt{'emfo'}</title></head>
329: $bodytag
330: <h3>$lt{'nere'}</h3>
331: <p>$warnmsg</p>
332: <ul>
333: <li><a href="javascript:history.go(-1)">$lt{'goba'}</a></li>
334: <li><a href="/adm/navmaps">$lt{'nacc'}</a></li>
335: </ul>
336: </body>
337: </html>
338: ENDNONE
339: } else {
340: &viewmap($r,$requrl);
341: }
342: return OK;
343: }
344: }
345:
346: 1;
347: __END__
348:
349:
350:
351:
352:
353:
354:
FreeBSD-CVSweb <freebsd-cvsweb@FreeBSD.org>
![[BACK]](/icons/back.gif){kind=icon}
Return to lonsequence.pm CVS log ![[TXT]](/icons/text.gif){kind=icon}
![[DIR]](/icons/dir.gif){kind=icon}
Up to [LON-CAPA] / rat