Annotation of rat/lonsequence.pm, revision 1.30
1.1 www 1: # The LearningOnline Network with CAPA
2: #
3: # Sequence Handler
4: #
1.30 ! albertel 5: # $Id: lonsequence.pm,v 1.29 2006/11/02 21:27:58 albertel 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:
1.3 www 30: package Apache::lonsequence;
1.1 www 31:
32: use strict;
33: use Apache::lonnet;
1.3 www 34: use Apache::Constants qw(:common :http REDIRECT);
1.1 www 35: use GDBM_File;
1.28 albertel 36: use LONCAPA::map();
37: use Apache::lonpageflip();
38: use Apache::loncommon();
1.16 www 39: use Apache::lonlocal;
1.30 ! albertel 40: use HTML::Entities();
1.1 www 41:
1.12 www 42: my %selhash;
43: my $successtied;
1.8 www 44:
45: # ----------------------------------------- Attempt to read from resource space
46:
47: sub attemptread {
48: my $fn=shift;
49: &Apache::lonnet::repcopy($fn);
50: if (-e $fn) {
1.28 albertel 51: return &LONCAPA::map::attemptread($fn);
1.8 www 52: } else {
53: return ();
54: }
55: }
56:
1.15 www 57: sub mapread {
58: my $fn=shift;
59: &Apache::lonnet::repcopy($fn);
60: if (-e $fn) {
1.28 albertel 61: return &LONCAPA::map::mapread($fn,'');
1.15 www 62: } else {
63: return ();
64: }
65: }
66:
1.8 www 67: # ---------------------------------------------------------------- View Handler
68:
69: sub viewmap {
1.9 www 70: my ($r,$url)=@_;
1.26 albertel 71:
72: my $js;
73: if ($env{'form.forceselect'}) {
74: $js = (<<ENDSCRIPT);
75: <script type="text/javascript">
1.8 www 76:
77: function select_group() {
1.12 www 78: window.location="/adm/groupsort?catalogmode=groupsec&mode=rat&acts="+document.forms.fileattr.acts.value;
1.8 www 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: }
1.26 albertel 97:
98: $r->print(&Apache::loncommon::start_page('Map Contents',$js).
99: '<h1>'.$url.'</h1>');
1.12 www 100: # ------------------ This is trying to select. Provide buttons and tie %selhash
1.24 albertel 101: if ($env{'form.forceselect'}) { $r->print(<<ENDSELECT);
1.8 www 102: <form name=fileattr><input type=hidden name=acts value=''>
103: <input type="button" name="close" value='CLOSE' onClick="self.close()">
104: <input type="button" name="groupimport" value='GROUP IMPORT'
105: onClick="javascript:select_group()">
106: </form>
107: ENDSELECT
1.12 www 108: my $diropendb =
1.27 www 109: "/home/httpd/perl/tmp/$env{'user.domain'}\_$env{'user.name'}_sel_res.db";
1.13 albertel 110: if (tie(%selhash,'GDBM_File',$diropendb,&GDBM_WRCREAT(),0640)) {
1.24 albertel 111: if ($env{'form.launch'} eq '1') {
1.12 www 112: &start_fresh_session();
113: }
114: $successtied=1;
115:
116: # - Evaluate actions from previous page (both cumulatively and chronologically)
1.27 www 117: if ($env{'form.catalogmode'} eq 'import') {
1.24 albertel 118: my $acts=$env{'form.acts'};
1.12 www 119: my @Acts=split(/b/,$acts);
120: my %ahash;
121: my %achash;
122: my $ac=0;
123: # some initial hashes for working with data
124: foreach (@Acts) {
125: my ($state,$ref)=split(/a/);
126: $ahash{$ref}=$state;
127: $achash{$ref}=$ac;
128: $ac++;
129: }
130: # sorting through the actions and changing the tied database hash
131: foreach (sort {$achash{$a}<=>$achash{$b}} (keys %ahash)) {
132: my $key=$_;
133: if ($ahash{$key} eq '1') {
134: $selhash{'store_'.$selhash{'pre_'.$key.'_link'}}=
135: $selhash{'pre_'.$key.'_title'};
136: $selhash{'storectr_'.$selhash{'pre_'.$key.'_link'}}=
137: $selhash{'storectr'}+0;
138: $selhash{'storectr'}++;
139: }
140: if ($ahash{$key} eq '0') {
141: if ($selhash{'store_'.$selhash{'pre_'.$key.'_link'}}) {
142: delete $selhash{'store_'.$selhash{'pre_'.$key.'_link'}};
143: }
144: }
145: }
146: # deleting the previously cached listing
147: foreach (keys %selhash) {
148: if ($_ =~ /^pre_/ && $_ =~/link$/) {
149: my $key = $_;
150: $key =~ s/^pre_//;
151: $key =~ s/_[^_]*$//;
152: delete $selhash{'pre_'.$key.'_title'};
153: delete $selhash{'pre_'.$key.'_link'};
154: }
155: }
156: }
157: # -
158: }
1.8 www 159: }
1.12 www 160: # ----------------------------- successtied is now '1' if in working selectmode
1.15 www 161: my ($errtext,$fatal)=&mapread(&Apache::lonnet::filelocation('',$url),'');
162: if ($fatal==1) {
1.16 www 163: $r->print('<p><b><font color="red">'.&mt('Map contents are not shown in order.').'</font></b></p><br />');
1.15 www 164: }
1.8 www 165: my $idx=0;
166: foreach (&attemptread(&Apache::lonnet::filelocation('',$url))) {
167: if (defined($_)) {
168: $idx++;
1.12 www 169: if ($successtied) {
1.8 www 170: $r->print('<form name="form'.$idx.'">');
171: }
172: my ($title,$url)=split(/\:/,$_);
1.30 ! albertel 173: $title = &LONCAPA::map::qtescape($title);
! 174: unless ($title) { $title=(split(/\//,$url))[-1] };
! 175: my $enc_title = &HTML::Entities::encode($title,'\'"<>&');
! 176: unless ($title) {
! 177: $title='<i>'.&mt('Empty').'</i>';
! 178: $enc_title = &mt('Empty');
! 179: }
! 180: $url = &LONCAPA::map::qtescape($url);
! 181: my $enc_url = &HTML::Entities::encode($url,'\'"<>&');
1.8 www 182: if ($url) {
1.12 www 183: if ($successtied) {
184: my $checked='';
185: if ($selhash{'store_'.$url}) {
186: $checked=" checked";
187: }
188: $selhash{"pre_${idx}_link"}=$url;
189: $selhash{"pre_${idx}_title"}=$title;
1.30 ! albertel 190:
! 191: $url = &HTML::Entities::encode($url, '\'"<>&');
1.8 www 192: $r->print(<<ENDCHECKBOX);
193: <input type='checkbox' name='filelink'
1.30 ! albertel 194: value='$enc_url' onClick='javascript:queue("form$idx")'$checked />
! 195: <input type='hidden' name='title' value='$enc_title' />
1.8 www 196: ENDCHECKBOX
197: }
1.30 ! albertel 198: $r->print('<a href="'.$enc_url.'">');
1.8 www 199: }
1.30 ! albertel 200: $r->print($enc_title);
1.8 www 201: if ($url) { $r->print('</a>'); }
1.12 www 202: if ($successtied) {
1.8 www 203: $r->print('</form>');
204: } else {
205: $r->print('<br>');
206: }
207: }
208: }
1.26 albertel 209: $r->print(&Apache::loncommon::end_page());
1.12 www 210: if ($successtied) {
211: untie %selhash;
212: }
1.8 www 213: }
214:
1.12 www 215: # ----------------------------------------------------------- Clean out selhash
216: sub start_fresh_session {
217: foreach (keys %selhash) {
218: if ($_ =~ /^pre_/) {
219: delete $selhash{$_};
220: }
221: if ($_ =~ /^store/) {
222: delete $selhash{$_};
223: }
224: }
225: }
226:
227:
1.1 www 228: # ================================================================ Main Handler
229:
230: sub handler {
231: my $r=shift;
232:
233: if ($r->header_only) {
1.16 www 234: &Apache::loncommon::content_type($r,'text/html');
1.1 www 235: $r->send_http_header;
236: return OK;
237: }
1.8 www 238:
239: &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},
1.12 www 240: ['forceselect','launch']);
1.1 www 241:
1.2 www 242: my %hash;
1.1 www 243: my %bighash;
1.2 www 244: my $requrl=$r->uri;
245:
1.12 www 246: $successtied=0;
1.3 www 247: # ------------------------------------------------------------ Tie symb db file
1.9 www 248: my $disurl='';
249: my $dismapid='';
1.18 raeburn 250: my $exitdisid = '';
251: my $arrow_dir = '';
1.9 www 252:
1.24 albertel 253: if (($env{'request.course.fn'}) && (!$env{'form.forceselect'})) {
1.2 www 254: my $last;
1.24 albertel 255: if (tie(%hash,'GDBM_File',$env{'request.course.fn'}.'_symb.db',
1.13 albertel 256: &GDBM_READER(),0640)) {
1.2 www 257: $last=$hash{'last_direction'};
258: untie(%hash);
259: }
1.3 www 260: my $direction='';
261: my $prevmap='';
262: if ($last) {
1.23 albertel 263: ($prevmap,undef,$direction)=&Apache::lonnet::decode_symb($last);
1.3 www 264: }
265: # ------------------------------------------------------------- Tie big db file
1.24 albertel 266: if (tie(%bighash,'GDBM_File',$env{'request.course.fn'}.'.db',
1.13 albertel 267: &GDBM_READER(),0640)) {
1.3 www 268: my $disid='';
1.17 raeburn 269: my $randomout ='';
1.10 www 270:
1.3 www 271: if ($direction eq 'back') {
272: $disid=$bighash{'map_finish_'.$requrl};
273: } else {
274: $disid=$bighash{'map_start_'.$requrl};
1.18 raeburn 275: }
1.3 www 276: if ($disid) {
277: $disurl=$bighash{'src_'.$disid};
1.4 www 278: $dismapid=(split(/\./,$disid))[1];
1.25 albertel 279: if (!$env{'request.role.adv'}) {
280: $randomout = $bighash{'randomout_'.$disid};
281: }
1.24 albertel 282: } elsif (tie(%hash,'GDBM_File',$env{'request.course.fn'}.'_symb.db',
1.18 raeburn 283: &GDBM_READER(),0640)) {
284: $last=$hash{'last_known'};
285: untie(%hash);
1.3 www 286: }
1.18 raeburn 287:
288:
1.17 raeburn 289: # ----------- If this is an empty one, or hidden, skip to next non-empty or non-hidden one
1.18 raeburn 290: while ( ((!$disurl) && ($disid)) || ($randomout && $disid) ) {
1.11 www 291: $direction=($direction?$direction:'forward');
292: ($disid,$requrl)=
293: &Apache::lonpageflip::fullmove($disid,
294: &Apache::lonnet::declutter($requrl),$direction);
295: if ($disid) {
296: $disurl=$bighash{'src_'.$disid};
297: $dismapid=(split(/\./,$disid))[1];
1.25 albertel 298: if (!$env{'request.role.adv'}) {
299: $randomout = $bighash{'randomout_'.$disid};
300: }
1.11 www 301: }
302: }
1.18 raeburn 303: $exitdisid = $disid;
304: $arrow_dir = $direction;
1.11 www 305:
1.3 www 306: # --------------------------------------- Untie hash, make sure to come by here
307: untie(%bighash);
1.9 www 308: }
309: }
310:
311: # now either disurl is set (going to first page), or we need another display
312: if ($disurl) {
1.3 www 313: # -------------------------------------------------- Has first or last resource
1.23 albertel 314: &Apache::lonnet::symblist($requrl,$disurl => [$disurl,$dismapid],
315: 'last_known' => [$disurl,$dismapid]);
1.16 www 316: &Apache::loncommon::content_type($r,'text/html');
1.9 www 317: $r->header_out(Location => 'http://'.$ENV{'HTTP_HOST'}.$disurl);
318: return REDIRECT;
1.1 www 319: } else {
1.16 www 320: &Apache::loncommon::content_type($r,'text/html');
1.9 www 321: $r->send_http_header;
1.21 albertel 322: if ($exitdisid eq '' && $arrow_dir ne '') {
1.18 raeburn 323: my %lt =&Apache::lonlocal::texthash(
324: 'back' => 'beginning',
325: 'forward' => 'end',
326: 'nere' => 'Next resource could not be displayed',
327: 'goba' => 'Go Back',
328: 'nacc' => 'Navigate Course Content',
329: );
1.26 albertel 330: my $warnmsg = &mt('As all folders and sequences ');
1.18 raeburn 331: if ($arrow_dir eq 'forward') {
332: $warnmsg .= &mt('following the current resource were empty').',';
333: } elsif ($arrow_dir eq 'back') {
334: $warnmsg .= &mt('preceding the current resource were empty').',';
335: }
336: $warnmsg .= &mt('you have now reached the').' '.$lt{$arrow_dir}.' '.&mt('of the course.');
1.26 albertel 337: my $start_page=
338: &Apache::loncommon::start_page('Empty Folder/Sequence');
339: my $end_page=
340: &Apache::loncommon::end_page();
1.18 raeburn 341: $r->print(<<ENDNONE);
1.26 albertel 342: $start_page
1.18 raeburn 343: <h3>$lt{'nere'}</h3>
344: <p>$warnmsg</p>
345: <ul>
346: <li><a href="javascript:history.go(-1)">$lt{'goba'}</a></li>
347: <li><a href="/adm/navmaps">$lt{'nacc'}</a></li>
348: </ul>
1.26 albertel 349: $end_page
1.18 raeburn 350: ENDNONE
351: } else {
352: &viewmap($r,$requrl);
353: }
1.9 www 354: return OK;
1.1 www 355: }
356: }
357:
358: 1;
359: __END__
360:
361:
362:
363:
364:
365:
366:
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