Annotation of rat/lonpageflip.pm, revision 1.24
1.1 www 1: # The LearningOnline Network with CAPA
2: #
3: # Page flip handler
4: #
1.22 www 5: # $Id: lonpageflip.pm,v 1.21 2002/04/11 18:19:46 www Exp $
1.18 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: # (Page Handler
30: #
31: # (TeX Content Handler
32: #
33: # 05/29/00,05/30 Gerd Kortemeyer)
34: # 08/30,08/31,09/06,09/14,09/15,09/16,09/19,09/20,09/21,09/23,
35: # 10/02 Gerd Kortemeyer)
36: #
1.13 www 37: # 10/03,10/05,10/06,10/07,10/09,10/10,10/11,10/16,10/17,
1.14 www 38: # 11/14,11/16,
1.17 www 39: # 10/01/01,05/01,05/28,07/05 Gerd Kortemeyer
1.1 www 40:
41: package Apache::lonpageflip;
42:
43: use strict;
1.4 www 44: use Apache::Constants qw(:common :http REDIRECT);
1.1 www 45: use Apache::lonnet();
46: use HTML::TokeParser;
47: use GDBM_File;
48:
1.3 www 49: # ========================================================== Module Global Hash
50:
1.1 www 51: my %hash;
52:
1.3 www 53: sub addrid {
1.4 www 54: my ($current,$new,$condid)=@_;
55: unless ($condid) { $condid=0; }
1.3 www 56: if (&Apache::lonnet::allowed('bre',$hash{'src_'.$new})) {
57: if ($current) {
1.5 www 58: $current.=','.$new;
1.3 www 59: } else {
1.5 www 60: $current=''.$new;
1.3 www 61: }
1.1 www 62: }
1.3 www 63: return $current;
1.1 www 64: }
65:
1.15 www 66: sub move {
67: my ($rid,$mapurl,$direction)=@_;
1.23 www 68: my $startoutrid=$rid;
1.15 www 69:
70: my $next='';
71:
72: my $mincond=1;
73: my $posnext='';
74: if ($direction eq 'forward') {
75: # --------------------------------------------------------------------- Forward
76: if ($hash{'type_'.$rid} eq 'finish') {
77: $rid=$hash{'ids_/res/'.$mapurl};
78: }
79: map {
80: my $thiscond=
81: &Apache::lonnet::directcondval($hash{'condid_'.$hash{'undercond_'.$_}});
82: if ($thiscond>=$mincond) {
83: if ($posnext) {
84: $posnext.=','.$_.':'.$thiscond;
85: } else {
86: $posnext=$_.':'.$thiscond;
87: }
88: if ($thiscond>$mincond) { $mincond=$thiscond; }
89: }
90: } split(/\,/,$hash{'to_'.$rid});
91: map {
92: my ($linkid,$condval)=split(/\:/,$_);
93: if ($condval>=$mincond) {
94: $next=&addrid($next,$hash{'goesto_'.$linkid},
95: $hash{'condid_'.$hash{'undercond_'.$linkid}});
96: }
97: } split(/\,/,$posnext);
98: if ($hash{'is_map_'.$next}) {
1.23 www 99: # This jumps to the beginning of a new map (going down level)
1.15 www 100: if (
101: $hash{'map_type_'.$hash{'map_pc_'.$hash{'src_'.$next}}} eq 'sequence') {
102: $mapurl=$hash{'src_'.$next};
103: $next=$hash{'map_start_'.$hash{'src_'.$next}};
104: }
1.23 www 105: } elsif
106: ((split(/\./,$startoutrid))[0]!=(split(/\./,$next))[0]) {
107: # This comes up from a map (coming up one level);
108: $mapurl=$hash{'map_id_'.(split(/\./,$next))[0]};
1.15 www 109: }
110: } elsif ($direction eq 'back') {
111: # ------------------------------------------------------------------- Backwards
112: if ($hash{'type_'.$rid} eq 'start') {
113: $rid=$hash{'ids_/res/'.$mapurl};
114: }
115: map {
116: my $thiscond=
117: &Apache::lonnet::directcondval($hash{'condid_'.$hash{'undercond_'.$_}});
118: if ($thiscond>=$mincond) {
119: if ($posnext) {
120: $posnext.=','.$_.':'.$thiscond;
121: } else {
122: $posnext=$_.':'.$thiscond;
123: }
124: if ($thiscond>$mincond) { $mincond=$thiscond; }
125: }
126: } split(/\,/,$hash{'from_'.$rid});
127: map {
128: my ($linkid,$condval)=split(/\:/,$_);
129: if ($condval>=$mincond) {
130: $next=&addrid($next,$hash{'comesfrom_'.$linkid},
131: $hash{'condid_'.$hash{'undercond_'.$linkid}});
132: }
133: } split(/\,/,$posnext);
134: if ($hash{'is_map_'.$next}) {
1.24 ! www 135: # This jumps to the end of a new map (going down one level)
1.15 www 136: if (
137: $hash{'map_type_'.$hash{'map_pc_'.$hash{'src_'.$next}}} eq 'sequence') {
138: $mapurl=$hash{'src_'.$next};
139: $next=$hash{'map_finish_'.$hash{'src_'.$next}};
140: }
1.24 ! www 141: } elsif
! 142: ((split(/\./,$startoutrid))[0]!=(split(/\./,$next))[0]) {
! 143: # This comes back up from a map (going up one level);
! 144: $mapurl=$hash{'map_id_'.(split(/\./,$next))[0]};
1.15 www 145: }
146: }
147: return ($next,$mapurl);
148: }
149:
1.1 www 150: # ================================================================ Main Handler
151:
152: sub handler {
1.2 www 153: my $r=shift;
1.1 www 154:
155: # ------------------------------------------- Set document type for header only
156:
1.2 www 157: if ($r->header_only) {
1.1 www 158: $r->content_type('text/html');
159: $r->send_http_header;
1.2 www 160: return OK;
161: }
162:
1.5 www 163: my %cachehash=();
164: my $multichoice=0;
165: my %multichoicehash=();
1.4 www 166: my $redirecturl='';
167: my $next='';
168: my @possibilities=();
1.2 www 169: if (($ENV{'form.postdata'})&&($ENV{'request.course.fn'})) {
170: $ENV{'form.postdata'}=~/(\w+)\:(.*)/;
171: my $direction=$1;
172: my $currenturl=$2;
1.10 www 173: if ($direction eq 'return') {
174: # -------------------------------------------------------- Return to last known
175: my $last;
176: if (tie(%hash,'GDBM_File',$ENV{'request.course.fn'}.'_symb.db',
177: &GDBM_READER,0640)) {
178: $last=$hash{'last_known'};
179: untie(%hash);
180: }
181: my $newloc;
182: if ($last) {
183: $newloc='/res/'.(split(/\_\_\_/,$last))[1];
184: } else {
185: $newloc='/adm/noidea.html';
186: }
187: $r->content_type('text/html');
188: $r->header_out(Location =>
189: 'http://'.$ENV{'HTTP_HOST'}.$newloc);
190:
191: return REDIRECT;
192: }
1.2 www 193: $currenturl=~s/^http\:\/\///;
194: $currenturl=~s/^[^\/]+//;
1.17 www 195: unless (($currenturl=~/^\/res\//) ||
196: ($currenturl=~/^\/adm\/wrapper\//)) {
1.7 www 197: my $last;
198: if (tie(%hash,'GDBM_File',$ENV{'request.course.fn'}.'_symb.db',
199: &GDBM_READER,0640)) {
200: $last=$hash{'last_known'};
201: untie(%hash);
202: }
203: if ($last) {
204: $currenturl='/res/'.(split(/\_\_\_/,$last))[1];
205: } else {
206: $r->content_type('text/html');
207: $r->header_out(Location =>
208: 'http://'.$ENV{'HTTP_HOST'}.'/adm/noidea.html');
1.9 www 209: return REDIRECT;
1.7 www 210: }
211: }
1.3 www 212: # ------------------------------------------- Do we have any idea where we are?
213: my $position;
214: if ($position=Apache::lonnet::symbread($currenturl)) {
215: # ------------------------------------------------------------------------- Yes
1.22 www 216: my ($startoutmap,$mapnum,$thisurl)=split(/\_\_\_/,$position);
217: $cachehash{$startoutmap}{$thisurl}=$mapnum;
1.23 www 218: $cachehash{$startoutmap}{'last_known'}=
219: &Apache::lonnet::declutter($currenturl);
1.20 albertel 220:
1.5 www 221: # ============================================================ Tie the big hash
1.3 www 222: if (tie(%hash,'GDBM_File',$ENV{'request.course.fn'}.'.db',
223: &GDBM_READER,0640)) {
1.22 www 224: my $rid=$hash{'map_pc_/res/'.$startoutmap}.'.'.$mapnum;
1.14 www 225:
1.15 www 226: # ------------------------------------------------- Move forward, backward, etc
1.22 www 227: my $endupmap;
228: ($next,$endupmap)=&move($rid,$startoutmap,$direction);
1.15 www 229: # -------------------------------------- Do we have one and only one empty URL?
230: my $safecount=0;
231: while (($next) && ($next!~/\,/) && (!$hash{'src_'.$next})
232: && ($safecount<25)) {
1.22 www 233: ($next,$endupmap)=&move($next,$endupmap,$direction);
1.15 www 234: $safecount++;
235: }
1.22 www 236: # We are now at at least one non-empty URL
1.4 www 237: # ----------------------------------------------------- Check out possibilities
238: if ($next) {
239: @possibilities=split(/\,/,$next);
240: if ($#possibilities==0) {
1.5 www 241: # ---------------------------------------------- Only one possibility, redirect
242: $redirecturl=$hash{'src_'.$next};
1.22 www 243: $cachehash{$endupmap}
1.19 www 244: {&Apache::lonnet::declutter($redirecturl)}
1.5 www 245: =(split(/\./,$next))[1];
1.4 www 246: } else {
1.5 www 247: # ------------------------ There are multiple possibilities for a next resource
248: $multichoice=1;
249: map {
250: $multichoicehash{'src_'.$_}=$hash{'src_'.$_};
251: $multichoicehash{'title_'.$_}=$hash{'title_'.$_};
1.6 www 252: $multichoicehash{'type_'.$_}=$hash{'type_'.$_};
1.22 www 253: my ($choicemap,$choiceres)=split(/\./,$_);
254: $cachehash
255: {&Apache::lonnet::declutter($hash{'src_'.$choicemap})}
256: {&Apache::lonnet::declutter(
1.5 www 257: $multichoicehash
258: {'src_'.$_}
259: )}
1.22 www 260: =$choiceres;
1.5 www 261: } @possibilities;
1.4 www 262: }
1.5 www 263: } else {
264: # -------------------------------------------------------------- No place to go
265: $multichoice=-1;
1.4 www 266: }
1.5 www 267: # ----------------- The program must come past this point to untie the big hash
1.3 www 268: untie(%hash);
1.5 www 269: # --------------------------------------------------------- Store position info
1.22 www 270: $cachehash{$startoutmap}{'last_direction'}=$direction;
1.19 www 271: foreach my $thismap (keys %cachehash) {
1.20 albertel 272: &Apache::lonnet::symblist($thismap,%{$cachehash{$thismap}});
1.19 www 273: }
1.5 www 274: # ============================================== Do not return before this line
1.4 www 275: if ($redirecturl) {
1.5 www 276: # ----------------------------------------------------- There is a URL to go to
1.4 www 277: $r->content_type('text/html');
278: $r->header_out(Location =>
279: 'http://'.$ENV{'HTTP_HOST'}.$redirecturl);
280: return REDIRECT;
1.5 www 281: } else {
282: # --------------------------------------------------------- There was a problem
1.8 www 283: $r->content_type('text/html');
284: $r->send_http_header;
285: if ($#possibilities>0) {
286: $r->print(<<ENDSTART);
287: <head><title>Choose Next Location</title></head>
288: <body bgcolor="#FFFFFF">
289: <h1>LON-CAPA</h1>
290: There are several possibilities of where to go next.
291: <p>
292: Please click on the the resource you intend to access:
293: <p>
294: <table border=2>
295: <tr><th>Title</th><th>Type</th></tr>
296: ENDSTART
297: map {
298: $r->print(
299: '<tr><td><a href="'.
300: $multichoicehash{'src_'.$_}.'">'.
301: $multichoicehash{'title_'.$_}.
302: '</a></td><td>'.$multichoicehash{'type_'.$_}.
303: '</td></tr>');
304: } @possibilities;
305: $r->print('</table></body></html>');
306: return OK;
307: } else {
308: $r->print(<<ENDNONE);
309: <head><title>Choose Next Location</title></head>
310: <body bgcolor="#FFFFFF">
1.17 www 311: <img src="/adm/lonIcons/lonlogos.gif" align=right>
1.8 www 312: <h1>Sorry!</h1>
313: <h2>Next resource could not be identified.</h2>
1.17 www 314: <h3>You probably are at the beginning or the end of the course.</h3>
1.8 www 315: </body>
316: </html>
317: ENDNONE
318: return OK;
319: }
320: }
1.5 www 321: } else {
322: # ------------------------------------------------- Problem, could not tie hash
323: $ENV{'user.error.msg'}="/adm/flip:bre:0:1:Course Data Missing";
324: return HTTP_NOT_ACCEPTABLE;
1.3 www 325: }
1.5 www 326: } else {
327: # ---------------------------------------- No, could not determine where we are
1.6 www 328: $r->internal_redirect('/adm/ambiguous');
1.2 www 329: }
1.5 www 330: } else {
1.2 www 331: # -------------------------- Class was not initialized or page fliped strangely
332: $ENV{'user.error.msg'}="/adm/flip:bre:0:0:Choose Course";
333: return HTTP_NOT_ACCEPTABLE;
334: }
1.1 www 335: }
336:
337: 1;
338: __END__
339:
340:
341:
342:
343:
344:
345:
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