1: # The LearningOnline Network with CAPA
2: #
3: # Sequence Handler
4: #
5: # $Id: lonsequence.pm,v 1.29 2006/11/02 21:27:58 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:
30: package Apache::lonsequence;
31:
32: use strict;
33: use Apache::lonnet;
34: use Apache::Constants qw(:common :http REDIRECT);
35: use GDBM_File;
36: use LONCAPA::map();
37: use Apache::lonpageflip();
38: use Apache::loncommon();
39: use Apache::lonlocal;
40:
41: my %selhash;
42: my $successtied;
43:
44: # ----------------------------------------- Attempt to read from resource space
45:
46: sub attemptread {
47: my $fn=shift;
48: &Apache::lonnet::repcopy($fn);
49: if (-e $fn) {
50: return &LONCAPA::map::attemptread($fn);
51: } else {
52: return ();
53: }
54: }
55:
56: sub mapread {
57: my $fn=shift;
58: &Apache::lonnet::repcopy($fn);
59: if (-e $fn) {
60: return &LONCAPA::map::mapread($fn,'');
61: } else {
62: return ();
63: }
64: }
65:
66: # ---------------------------------------------------------------- View Handler
67:
68: sub viewmap {
69: my ($r,$url)=@_;
70:
71: my $js;
72: if ($env{'form.forceselect'}) {
73: $js = (<<ENDSCRIPT);
74: <script type="text/javascript">
75:
76: function select_group() {
77: window.location="/adm/groupsort?catalogmode=groupsec&mode=rat&acts="+document.forms.fileattr.acts.value;
78: }
79:
80: function queue(val) {
81: if (eval("document.forms."+val+".filelink.checked")) {
82: var l=val.length;
83: var v=val.substring(4,l);
84: document.forms.fileattr.acts.value+='1a'+v+'b';
85: }
86: else {
87: var l=val.length;
88: var v=val.substring(4,l);
89: document.forms.fileattr.acts.value+='0a'+v+'b';
90: }
91: }
92:
93: </script>
94: ENDSCRIPT
95: }
96:
97: $r->print(&Apache::loncommon::start_page('Map Contents',$js).
98: '<h1>'.$url.'</h1>');
99: # ------------------ This is trying to select. Provide buttons and tie %selhash
100: if ($env{'form.forceselect'}) { $r->print(<<ENDSELECT);
101: <form name=fileattr><input type=hidden name=acts value=''>
102: <input type="button" name="close" value='CLOSE' onClick="self.close()">
103: <input type="button" name="groupimport" value='GROUP IMPORT'
104: onClick="javascript:select_group()">
105: </form>
106: ENDSELECT
107: my $diropendb =
108: "/home/httpd/perl/tmp/$env{'user.domain'}\_$env{'user.name'}_sel_res.db";
109: if (tie(%selhash,'GDBM_File',$diropendb,&GDBM_WRCREAT(),0640)) {
110: if ($env{'form.launch'} eq '1') {
111: &start_fresh_session();
112: }
113: $successtied=1;
114:
115: # - Evaluate actions from previous page (both cumulatively and chronologically)
116: if ($env{'form.catalogmode'} eq 'import') {
117: my $acts=$env{'form.acts'};
118: my @Acts=split(/b/,$acts);
119: my %ahash;
120: my %achash;
121: my $ac=0;
122: # some initial hashes for working with data
123: foreach (@Acts) {
124: my ($state,$ref)=split(/a/);
125: $ahash{$ref}=$state;
126: $achash{$ref}=$ac;
127: $ac++;
128: }
129: # sorting through the actions and changing the tied database hash
130: foreach (sort {$achash{$a}<=>$achash{$b}} (keys %ahash)) {
131: my $key=$_;
132: if ($ahash{$key} eq '1') {
133: $selhash{'store_'.$selhash{'pre_'.$key.'_link'}}=
134: $selhash{'pre_'.$key.'_title'};
135: $selhash{'storectr_'.$selhash{'pre_'.$key.'_link'}}=
136: $selhash{'storectr'}+0;
137: $selhash{'storectr'}++;
138: }
139: if ($ahash{$key} eq '0') {
140: if ($selhash{'store_'.$selhash{'pre_'.$key.'_link'}}) {
141: delete $selhash{'store_'.$selhash{'pre_'.$key.'_link'}};
142: }
143: }
144: }
145: # deleting the previously cached listing
146: foreach (keys %selhash) {
147: if ($_ =~ /^pre_/ && $_ =~/link$/) {
148: my $key = $_;
149: $key =~ s/^pre_//;
150: $key =~ s/_[^_]*$//;
151: delete $selhash{'pre_'.$key.'_title'};
152: delete $selhash{'pre_'.$key.'_link'};
153: }
154: }
155: }
156: # -
157: }
158: }
159: # ----------------------------- successtied is now '1' if in working selectmode
160: my ($errtext,$fatal)=&mapread(&Apache::lonnet::filelocation('',$url),'');
161: if ($fatal==1) {
162: $r->print('<p><b><font color="red">'.&mt('Map contents are not shown in order.').'</font></b></p><br />');
163: }
164: my $idx=0;
165: foreach (&attemptread(&Apache::lonnet::filelocation('',$url))) {
166: if (defined($_)) {
167: $idx++;
168: if ($successtied) {
169: $r->print('<form name="form'.$idx.'">');
170: }
171: my ($title,$url)=split(/\:/,$_);
172: $title=~s/\&colon\;/\:/g;
173: $url=~s/\&colon\;/\:/g;
174: unless ($title) { $title=(split(/\//,$url))[-1] };
175: unless ($title) { $title='<i>'.&mt('Empty').'</i>'; }
176: if ($url) {
177: if ($successtied) {
178: my $checked='';
179: if ($selhash{'store_'.$url}) {
180: $checked=" checked";
181: }
182: $selhash{"pre_${idx}_link"}=$url;
183: $selhash{"pre_${idx}_title"}=$title;
184:
185: $r->print(<<ENDCHECKBOX);
186: <input type='checkbox' name='filelink'
187: value='$url' onClick='javascript:queue("form$idx")'$checked>
188: <input type='hidden' name='title' value='$title'>
189: ENDCHECKBOX
190: }
191: $r->print('<a href="'.&LONCAPA::map::qtescape($url).'">');
192: }
193: $r->print(&LONCAPA::map::qtescape($title));
194: if ($url) { $r->print('</a>'); }
195: if ($successtied) {
196: $r->print('</form>');
197: } else {
198: $r->print('<br>');
199: }
200: }
201: }
202: $r->print(&Apache::loncommon::end_page());
203: if ($successtied) {
204: untie %selhash;
205: }
206: }
207:
208: # ----------------------------------------------------------- Clean out selhash
209: sub start_fresh_session {
210: foreach (keys %selhash) {
211: if ($_ =~ /^pre_/) {
212: delete $selhash{$_};
213: }
214: if ($_ =~ /^store/) {
215: delete $selhash{$_};
216: }
217: }
218: }
219:
220:
221: # ================================================================ Main Handler
222:
223: sub handler {
224: my $r=shift;
225:
226: if ($r->header_only) {
227: &Apache::loncommon::content_type($r,'text/html');
228: $r->send_http_header;
229: return OK;
230: }
231:
232: &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},
233: ['forceselect','launch']);
234:
235: my %hash;
236: my %bighash;
237: my $requrl=$r->uri;
238:
239: $successtied=0;
240: # ------------------------------------------------------------ Tie symb db file
241: my $disurl='';
242: my $dismapid='';
243: my $exitdisid = '';
244: my $arrow_dir = '';
245:
246: if (($env{'request.course.fn'}) && (!$env{'form.forceselect'})) {
247: my $last;
248: if (tie(%hash,'GDBM_File',$env{'request.course.fn'}.'_symb.db',
249: &GDBM_READER(),0640)) {
250: $last=$hash{'last_direction'};
251: untie(%hash);
252: }
253: my $direction='';
254: my $prevmap='';
255: if ($last) {
256: ($prevmap,undef,$direction)=&Apache::lonnet::decode_symb($last);
257: }
258: # ------------------------------------------------------------- Tie big db file
259: if (tie(%bighash,'GDBM_File',$env{'request.course.fn'}.'.db',
260: &GDBM_READER(),0640)) {
261: my $disid='';
262: my $randomout ='';
263:
264: if ($direction eq 'back') {
265: $disid=$bighash{'map_finish_'.$requrl};
266: } else {
267: $disid=$bighash{'map_start_'.$requrl};
268: }
269: if ($disid) {
270: $disurl=$bighash{'src_'.$disid};
271: $dismapid=(split(/\./,$disid))[1];
272: if (!$env{'request.role.adv'}) {
273: $randomout = $bighash{'randomout_'.$disid};
274: }
275: } elsif (tie(%hash,'GDBM_File',$env{'request.course.fn'}.'_symb.db',
276: &GDBM_READER(),0640)) {
277: $last=$hash{'last_known'};
278: untie(%hash);
279: }
280:
281:
282: # ----------- If this is an empty one, or hidden, skip to next non-empty or non-hidden one
283: while ( ((!$disurl) && ($disid)) || ($randomout && $disid) ) {
284: $direction=($direction?$direction:'forward');
285: ($disid,$requrl)=
286: &Apache::lonpageflip::fullmove($disid,
287: &Apache::lonnet::declutter($requrl),$direction);
288: if ($disid) {
289: $disurl=$bighash{'src_'.$disid};
290: $dismapid=(split(/\./,$disid))[1];
291: if (!$env{'request.role.adv'}) {
292: $randomout = $bighash{'randomout_'.$disid};
293: }
294: }
295: }
296: $exitdisid = $disid;
297: $arrow_dir = $direction;
298:
299: # --------------------------------------- Untie hash, make sure to come by here
300: untie(%bighash);
301: }
302: }
303:
304: # now either disurl is set (going to first page), or we need another display
305: if ($disurl) {
306: # -------------------------------------------------- Has first or last resource
307: &Apache::lonnet::symblist($requrl,$disurl => [$disurl,$dismapid],
308: 'last_known' => [$disurl,$dismapid]);
309: &Apache::loncommon::content_type($r,'text/html');
310: $r->header_out(Location => 'http://'.$ENV{'HTTP_HOST'}.$disurl);
311: return REDIRECT;
312: } else {
313: &Apache::loncommon::content_type($r,'text/html');
314: $r->send_http_header;
315: if ($exitdisid eq '' && $arrow_dir ne '') {
316: my %lt =&Apache::lonlocal::texthash(
317: 'back' => 'beginning',
318: 'forward' => 'end',
319: 'nere' => 'Next resource could not be displayed',
320: 'goba' => 'Go Back',
321: 'nacc' => 'Navigate Course Content',
322: );
323: my $warnmsg = &mt('As all folders and sequences ');
324: if ($arrow_dir eq 'forward') {
325: $warnmsg .= &mt('following the current resource were empty').',';
326: } elsif ($arrow_dir eq 'back') {
327: $warnmsg .= &mt('preceding the current resource were empty').',';
328: }
329: $warnmsg .= &mt('you have now reached the').' '.$lt{$arrow_dir}.' '.&mt('of the course.');
330: my $start_page=
331: &Apache::loncommon::start_page('Empty Folder/Sequence');
332: my $end_page=
333: &Apache::loncommon::end_page();
334: $r->print(<<ENDNONE);
335: $start_page
336: <h3>$lt{'nere'}</h3>
337: <p>$warnmsg</p>
338: <ul>
339: <li><a href="javascript:history.go(-1)">$lt{'goba'}</a></li>
340: <li><a href="/adm/navmaps">$lt{'nacc'}</a></li>
341: </ul>
342: $end_page
343: ENDNONE
344: } else {
345: &viewmap($r,$requrl);
346: }
347: return OK;
348: }
349: }
350:
351: 1;
352: __END__
353:
354:
355:
356:
357:
358:
359:
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