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[LON-CAPA] /
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lonsequence.pm
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Mon Apr 7 20:47:06 2003 UTC (21 years ago) by
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version_1_0_3,
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version_1_0_1,
version_1_0_0,
version_0_99_5,
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version_0_99_3,
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version_0_99_0,
conference_2003,
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Bug #1354 - show warning if it was not possible to show map in linear order.
1: # The LearningOnline Network with CAPA
2: #
3: # Sequence Handler
4: #
5: # $Id: lonsequence.pm,v 1.15 2003/04/07 20:47:06 www 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: # (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:
39: package Apache::lonsequence;
40:
41: use strict;
42: use Apache::lonnet;
43: use Apache::Constants qw(:common :http REDIRECT);
44: use GDBM_File;
45: use Apache::lonratedt;
46: use Apache::lonratsrv;
47: use Apache::lonpageflip;
48: use Apache::loncommon;
49:
50: my %selhash;
51: my $successtied;
52:
53: # ----------------------------------------- Attempt to read from resource space
54:
55: sub attemptread {
56: my $fn=shift;
57: &Apache::lonnet::repcopy($fn);
58: if (-e $fn) {
59: return &Apache::lonratedt::attemptread($fn);
60: } else {
61: return ();
62: }
63: }
64:
65: sub mapread {
66: my $fn=shift;
67: &Apache::lonnet::repcopy($fn);
68: if (-e $fn) {
69: return &Apache::lonratedt::mapread($fn,'');
70: } else {
71: return ();
72: }
73: }
74:
75: # ---------------------------------------------------------------- View Handler
76:
77: sub viewmap {
78: my ($r,$url)=@_;
79: $r->print('<html>');
80: if ($ENV{'form.forceselect'}) { $r->print(<<ENDSCRIPT);
81: <script>
82:
83: function select_group() {
84: window.location="/adm/groupsort?catalogmode=groupsec&mode=rat&acts="+document.forms.fileattr.acts.value;
85: }
86:
87: function queue(val) {
88: if (eval("document.forms."+val+".filelink.checked")) {
89: var l=val.length;
90: var v=val.substring(4,l);
91: document.forms.fileattr.acts.value+='1a'+v+'b';
92: }
93: else {
94: var l=val.length;
95: var v=val.substring(4,l);
96: document.forms.fileattr.acts.value+='0a'+v+'b';
97: }
98: }
99:
100: </script>
101: ENDSCRIPT
102: }
103: $r->print(&Apache::loncommon::bodytag('Map Contents').'<h1>'.$url.'</h1>');
104: # ------------------ This is trying to select. Provide buttons and tie %selhash
105: if ($ENV{'form.forceselect'}) { $r->print(<<ENDSELECT);
106: <form name=fileattr><input type=hidden name=acts value=''>
107: <input type="button" name="close" value='CLOSE' onClick="self.close()">
108: <input type="button" name="groupimport" value='GROUP IMPORT'
109: onClick="javascript:select_group()">
110: </form>
111: ENDSELECT
112: my $diropendb =
113: "/home/httpd/perl/tmp/$ENV{'user.domain'}\_$ENV{'user.name'}_groupsec.db";
114: if (tie(%selhash,'GDBM_File',$diropendb,&GDBM_WRCREAT(),0640)) {
115: if ($ENV{'form.launch'} eq '1') {
116: &start_fresh_session();
117: }
118: $successtied=1;
119:
120: # - Evaluate actions from previous page (both cumulatively and chronologically)
121: if ($ENV{'form.catalogmode'} eq 'groupimport') {
122: my $acts=$ENV{'form.acts'};
123: my @Acts=split(/b/,$acts);
124: my %ahash;
125: my %achash;
126: my $ac=0;
127: # some initial hashes for working with data
128: foreach (@Acts) {
129: my ($state,$ref)=split(/a/);
130: $ahash{$ref}=$state;
131: $achash{$ref}=$ac;
132: $ac++;
133: }
134: # sorting through the actions and changing the tied database hash
135: foreach (sort {$achash{$a}<=>$achash{$b}} (keys %ahash)) {
136: my $key=$_;
137: if ($ahash{$key} eq '1') {
138: $selhash{'store_'.$selhash{'pre_'.$key.'_link'}}=
139: $selhash{'pre_'.$key.'_title'};
140: $selhash{'storectr_'.$selhash{'pre_'.$key.'_link'}}=
141: $selhash{'storectr'}+0;
142: $selhash{'storectr'}++;
143: }
144: if ($ahash{$key} eq '0') {
145: if ($selhash{'store_'.$selhash{'pre_'.$key.'_link'}}) {
146: delete $selhash{'store_'.$selhash{'pre_'.$key.'_link'}};
147: }
148: }
149: }
150: # deleting the previously cached listing
151: foreach (keys %selhash) {
152: if ($_ =~ /^pre_/ && $_ =~/link$/) {
153: my $key = $_;
154: $key =~ s/^pre_//;
155: $key =~ s/_[^_]*$//;
156: delete $selhash{'pre_'.$key.'_title'};
157: delete $selhash{'pre_'.$key.'_link'};
158: }
159: }
160: }
161: # -
162: }
163: }
164: # ----------------------------- successtied is now '1' if in working selectmode
165: my ($errtext,$fatal)=&mapread(&Apache::lonnet::filelocation('',$url),'');
166: if ($fatal==1) {
167: $r->print('<p><b><font color="red">Map contents are not shown in order.</font></b></p><br />');
168: }
169: my $idx=0;
170: foreach (&attemptread(&Apache::lonnet::filelocation('',$url))) {
171: if (defined($_)) {
172: $idx++;
173: if ($successtied) {
174: $r->print('<form name="form'.$idx.'">');
175: }
176: my ($title,$url)=split(/\:/,$_);
177: $title=~s/\&colon\;/\:/g;
178: $url=~s/\&colon\;/\:/g;
179: unless ($title) { $title=(split(/\//,$url))[-1] };
180: unless ($title) { $title='<i>Empty</i>'; }
181: if ($url) {
182: if ($successtied) {
183: my $checked='';
184: if ($selhash{'store_'.$url}) {
185: $checked=" checked";
186: }
187: $selhash{"pre_${idx}_link"}=$url;
188: $selhash{"pre_${idx}_title"}=$title;
189:
190: $r->print(<<ENDCHECKBOX);
191: <input type='checkbox' name='filelink'
192: value='$url' onClick='javascript:queue("form$idx")'$checked>
193: <input type='hidden' name='title' value='$title'>
194: ENDCHECKBOX
195: }
196: $r->print('<a href="'.&Apache::lonratsrv::qtescape($url).'">');
197: }
198: $r->print(&Apache::lonratsrv::qtescape($title));
199: if ($url) { $r->print('</a>'); }
200: if ($successtied) {
201: $r->print('</form>');
202: } else {
203: $r->print('<br>');
204: }
205: }
206: }
207: $r->print('</body></html>');
208: if ($successtied) {
209: untie %selhash;
210: }
211: }
212:
213: # ----------------------------------------------------------- Clean out selhash
214: sub start_fresh_session {
215: foreach (keys %selhash) {
216: if ($_ =~ /^pre_/) {
217: delete $selhash{$_};
218: }
219: if ($_ =~ /^store/) {
220: delete $selhash{$_};
221: }
222: }
223: }
224:
225:
226: # ================================================================ Main Handler
227:
228: sub handler {
229: my $r=shift;
230:
231: if ($r->header_only) {
232: $r->content_type('text/html');
233: $r->send_http_header;
234: return OK;
235: }
236:
237: &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},
238: ['forceselect','launch']);
239:
240: my %hash;
241: my %bighash;
242: my $requrl=$r->uri;
243:
244: $successtied=0;
245: # ------------------------------------------------------------ Tie symb db file
246: my $disurl='';
247: my $dismapid='';
248:
249: if (($ENV{'request.course.fn'}) && (!$ENV{'form.forceselect'})) {
250: my $last;
251: if (tie(%hash,'GDBM_File',$ENV{'request.course.fn'}.'_symb.db',
252: &GDBM_READER(),0640)) {
253: $last=$hash{'last_direction'};
254: untie(%hash);
255: }
256: my $direction='';
257: my $prevmap='';
258: if ($last) {
259: ($prevmap,$direction)=(split(/\_\_\_/,$last));
260: }
261: # ------------------------------------------------------------- Tie big db file
262: if (tie(%bighash,'GDBM_File',$ENV{'request.course.fn'}.'.db',
263: &GDBM_READER(),0640)) {
264: my $disid='';
265:
266: if ($direction eq 'back') {
267: $disid=$bighash{'map_finish_'.$requrl};
268: } else {
269: $disid=$bighash{'map_start_'.$requrl};
270: }
271: if ($disid) {
272: $disurl=$bighash{'src_'.$disid};
273: $dismapid=(split(/\./,$disid))[1];
274: }
275: # ------------------------- If this is an empty one, skip to next non-empty one
276: if ((!$disurl) && ($disid)) {
277: $direction=($direction?$direction:'forward');
278: ($disid,$requrl)=
279: &Apache::lonpageflip::fullmove($disid,
280: &Apache::lonnet::declutter($requrl),$direction);
281: if ($disid) {
282: $disurl=$bighash{'src_'.$disid};
283: $dismapid=(split(/\./,$disid))[1];
284: }
285: }
286:
287: # --------------------------------------- Untie hash, make sure to come by here
288: untie(%bighash);
289: }
290: }
291:
292: # now either disurl is set (going to first page), or we need another display
293:
294: if ($disurl) {
295: # -------------------------------------------------- Has first or last resource
296: &Apache::lonnet::symblist($requrl,$disurl => $dismapid,
297: 'last_known' => &Apache::lonnet::declutter($disurl));
298: $r->content_type('text/html');
299: $r->header_out(Location => 'http://'.$ENV{'HTTP_HOST'}.$disurl);
300: return REDIRECT;
301: } else {
302: $r->content_type('text/html');
303: $r->send_http_header;
304: &viewmap($r,$requrl);
305: return OK;
306: }
307: }
308:
309: 1;
310: __END__
311:
312:
313:
314:
315:
316:
317:
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