Annotation of loncom/interface/lonnavmaps.pm, revision 1.4
1.2 www 1: # The LearningOnline Network with CAPA
2: # Navigate Maps Handler
1.1 www 3: #
1.2 www 4: # (Page Handler
1.1 www 5: #
1.2 www 6: # (TeX Content Handler
1.1 www 7: #
1.2 www 8: # 05/29/00,05/30 Gerd Kortemeyer)
9: # 08/30,08/31,09/06,09/14,09/15,09/16,09/19,09/20,09/21,09/23,
10: # 10/02,10/10,10/14,10/16,10/18,10/19,10/31,11/6,11/14,11/16 Gerd Kortemeyer)
1.1 www 11: #
1.2 www 12: # 3/1/1,6/1 Gerd Kortemeyer
13:
1.1 www 14: package Apache::lonnavmaps;
15:
16: use strict;
1.2 www 17: use Apache::Constants qw(:common :http);
18: use Apache::lonnet();
19: use HTML::TokeParser;
20: use GDBM_File;
21:
22: # -------------------------------------------------------------- Module Globals
23: my %hash;
24: my @rows;
25:
26: # ------------------------------------------------------------------ Euclid gcd
27:
28: sub euclid {
29: my ($e,$f)=@_;
30: my $a; my $b; my $r;
31: if ($e>$f) { $b=$e; $r=$f; } else { $r=$e; $b=$f; }
32: while ($r!=0) {
33: $a=$b; $b=$r;
34: $r=$a%$b;
35: }
36: return $b;
37: }
38:
39: # ------------------------------------------------------------ Build page table
40:
41: sub tracetable {
42: my ($sofar,$rid,$beenhere)=@_;
43: my $further=$sofar;
44: unless ($beenhere=~/\&$rid\&/) {
45: $beenhere.=$rid.'&';
46:
47: if (defined($hash{'is_map_'.$rid})) {
48: if ((defined($hash{'map_start_'.$hash{'src_'.$rid}})) &&
49: (defined($hash{'map_finish_'.$hash{'src_'.$rid}}))) {
50: my $frid=$hash{'map_finish_'.$hash{'src_'.$rid}};
51: $sofar=
52: &tracetable($sofar,$hash{'map_start_'.$hash{'src_'.$rid}},
53: '&'.$frid.'&');
54: $sofar++;
55: if ($hash{'src_'.$frid}) {
56: my $brepriv=&Apache::lonnet::allowed('bre',$hash{'src_'.$frid});
57: if (($brepriv eq '2') || ($brepriv eq 'F')) {
58: if (defined($rows[$sofar])) {
59: $rows[$sofar].='&'.$frid;
60: } else {
61: $rows[$sofar]=$frid;
62: }
63: }
64: }
65: }
66: } else {
67: $sofar++;
68: if ($hash{'src_'.$rid}) {
69: my $brepriv=&Apache::lonnet::allowed('bre',$hash{'src_'.$rid});
70: if (($brepriv eq '2') || ($brepriv eq 'F')) {
71: if (defined($rows[$sofar])) {
72: $rows[$sofar].='&'.$rid;
73: } else {
74: $rows[$sofar]=$rid;
75: }
76: }
77: }
78: }
79:
80: if (defined($hash{'to_'.$rid})) {
81: my $mincond=1;
82: my $next='';
83: map {
84: my $thiscond=
85: &Apache::lonnet::directcondval($hash{'condid_'.$hash{'undercond_'.$_}});
86: if ($thiscond>=$mincond) {
87: if ($next) {
88: $next.=','.$_.':'.$thiscond;
89: } else {
90: $next=$_.':'.$thiscond;
91: }
92: if ($thiscond>$mincond) { $mincond=$thiscond; }
93: }
94: } split(/\,/,$hash{'to_'.$rid});
95: map {
96: my ($linkid,$condval)=split(/\:/,$_);
97: if ($condval>=$mincond) {
98: my $now=&tracetable($sofar,$hash{'goesto_'.$linkid},$beenhere);
99: if ($now>$further) { $further=$now; }
100: }
101: } split(/\,/,$next);
102:
103: }
104: }
105: return $further;
106: }
107:
108: # ================================================================ Main Handler
1.1 www 109:
110: sub handler {
1.2 www 111: my $r=shift;
112:
113:
114: # ------------------------------------------- Set document type for header only
115:
116: if ($r->header_only) {
117: if ($ENV{'browser.mathml'}) {
118: $r->content_type('text/xml');
119: } else {
120: $r->content_type('text/html');
121: }
122: $r->send_http_header;
123: return OK;
124: }
125:
126: my $requrl=$r->uri;
127: # ----------------------------------------------------------------- Tie db file
128: if ($ENV{'request.course.fn'}) {
129: my $fn=$ENV{'request.course.fn'};
130: if (-e "$fn.db") {
131: if (tie(%hash,'GDBM_File',"$fn.db",&GDBM_READER,0640)) {
132: # ------------------------------------------------------------------- Hash tied
133: my $firstres=$hash{'map_start_/res/'.$ENV{'request.course.uri'}};
134: my $lastres=$hash{'map_finish_/res/'.$ENV{'request.course.uri'}};
135: if (($firstres) && ($lastres)) {
136: # ----------------------------------------------------------------- Render page
137:
138: @rows=();
139:
140: &tracetable(0,$firstres,'&'.$lastres.'&');
141: if ($hash{'src_'.$lastres}) {
142: my $brepriv=
143: &Apache::lonnet::allowed('bre',$hash{'src_'.$lastres});
144: if (($brepriv eq '2') || ($brepriv eq 'F')) {
145: $rows[$#rows+1]=''.$lastres;
146: }
147: }
148:
149: # ------------------------------------------------------------------ Page parms
150:
151: my $j;
152: my $lcm=1;
153: my $contents=0;
154:
155: # ---------------------------------------------- Go through table to get layout
156:
157: for ($i=0;$i<=$#rows;$i++) {
158: if ($rows[$i]) {
159: $contents++;
160: my @colcont=split(/\&/,$rows[$i]);
161: $lcm*=($#colcont+1)/euclid($lcm,($#colcont+1));
162: }
163: }
1.4 ! www 164: }
1.2 www 165:
166: unless ($contents) {
167: $r->content_type('text/html');
168: $r->send_http_header;
169: $r->print('<html><body>Empty Map.</body></html>');
170: } else {
171: # ------------------------------------------------------------------ Build page
172:
173: # ---------------------------------------------------------------- Send headers
174:
175: $r->content_type('text/html');
176: $r->send_http_header;
177: $r->print(
178: '<html><head><title>Navigate LON-CAPA Maps</title></head>');
179:
180: $r->print('<body bgcolor="#FFFFFF">'.
181: '<h1>Navigate Course Map</h1>');
1.3 www 182: $r->rflush();
1.2 www 183: # ----------------------------------------------------------------- Start table
184: $r->print('<table cols="'.$lcm.'" border="0">');
185: for ($i=0;$i<=$#rows;$i++) {
186: if ($rows[$i]) {
187: $r->print("\n<tr>");
188: my @colcont=split(/\&/,$rows[$i]);
189: my $avespan=$lcm/($#colcont+1);
190: for ($j=0;$j<=$#colcont;$j++) {
191: my $rid=$colcont[$j];
192: $r->print('<td><a href="'.
193: $hash{'src_'.$rid}.'">'.
194: $hash{'title_'.$rid}.'</a>');
195: $r->print('</td>');
196: }
197: $r->print('</tr>');
198: }
199: }
200: $r->print("\n</table>");
201:
202: $r->print('</body></html>');
203: # -------------------------------------------------------------------- End page
204: }
205: # ------------------------------------------------------------- End render page
206: } else {
207: $r->content_type('text/html');
208: $r->send_http_header;
209: $r->print('<html><body>Coursemap undefined.</body></html>');
210: }
211: # ------------------------------------------------------------------ Untie hash
212: unless (untie(%hash)) {
213: &Apache::lonnet::logthis("<font color=blue>WARNING: ".
214: "Could not untie coursemap $fn (browse).</font>");
215: }
216: # -------------------------------------------------------------------- All done
217: return OK;
218: # ----------------------------------------------- Errors, hash could no be tied
219: }
220: }
221: }
1.3 www 222:
1.2 www 223: $ENV{'user.error.msg'}="$requrl:bre:0:0:Course not initialized";
224: return HTTP_NOT_ACCEPTABLE;
225: }
1.1 www 226:
227: 1;
228: __END__
1.2 www 229:
230:
231:
232:
233:
234:
235:
FreeBSD-CVSweb <freebsd-cvsweb@FreeBSD.org>
![[BACK]](/icons/back.gif){kind=icon}
Return to lonnavmaps.pm CVS log ![[TXT]](/icons/text.gif){kind=icon}
![[DIR]](/icons/dir.gif){kind=icon}
Up to [LON-CAPA] / loncom / interface