Annotation of loncom/interface/lonnavmaps.pm, revision 1.6
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})) {
1.6 ! www 48: $sofar++;
! 49: if (defined($rows[$sofar])) {
! 50: $rows[$sofar].='&h'.$rid;
! 51: } else {
! 52: $rows[$sofar]='h'.$rid;
! 53: }
1.2 www 54: if ((defined($hash{'map_start_'.$hash{'src_'.$rid}})) &&
55: (defined($hash{'map_finish_'.$hash{'src_'.$rid}}))) {
56: my $frid=$hash{'map_finish_'.$hash{'src_'.$rid}};
57: $sofar=
58: &tracetable($sofar,$hash{'map_start_'.$hash{'src_'.$rid}},
59: '&'.$frid.'&');
60: $sofar++;
61: if ($hash{'src_'.$frid}) {
62: my $brepriv=&Apache::lonnet::allowed('bre',$hash{'src_'.$frid});
63: if (($brepriv eq '2') || ($brepriv eq 'F')) {
64: if (defined($rows[$sofar])) {
65: $rows[$sofar].='&'.$frid;
66: } else {
67: $rows[$sofar]=$frid;
68: }
69: }
70: }
71: }
72: } else {
73: $sofar++;
74: if ($hash{'src_'.$rid}) {
75: my $brepriv=&Apache::lonnet::allowed('bre',$hash{'src_'.$rid});
76: if (($brepriv eq '2') || ($brepriv eq 'F')) {
77: if (defined($rows[$sofar])) {
78: $rows[$sofar].='&'.$rid;
79: } else {
80: $rows[$sofar]=$rid;
81: }
82: }
83: }
84: }
85:
86: if (defined($hash{'to_'.$rid})) {
87: my $mincond=1;
88: my $next='';
89: map {
90: my $thiscond=
91: &Apache::lonnet::directcondval($hash{'condid_'.$hash{'undercond_'.$_}});
92: if ($thiscond>=$mincond) {
93: if ($next) {
94: $next.=','.$_.':'.$thiscond;
95: } else {
96: $next=$_.':'.$thiscond;
97: }
98: if ($thiscond>$mincond) { $mincond=$thiscond; }
99: }
100: } split(/\,/,$hash{'to_'.$rid});
101: map {
102: my ($linkid,$condval)=split(/\:/,$_);
103: if ($condval>=$mincond) {
104: my $now=&tracetable($sofar,$hash{'goesto_'.$linkid},$beenhere);
105: if ($now>$further) { $further=$now; }
106: }
107: } split(/\,/,$next);
108:
109: }
110: }
111: return $further;
112: }
113:
114: # ================================================================ Main Handler
1.1 www 115:
116: sub handler {
1.2 www 117: my $r=shift;
118:
119:
120: # ------------------------------------------- Set document type for header only
121:
122: if ($r->header_only) {
123: if ($ENV{'browser.mathml'}) {
124: $r->content_type('text/xml');
125: } else {
126: $r->content_type('text/html');
127: }
128: $r->send_http_header;
129: return OK;
130: }
131:
132: my $requrl=$r->uri;
133: # ----------------------------------------------------------------- Tie db file
134: if ($ENV{'request.course.fn'}) {
135: my $fn=$ENV{'request.course.fn'};
136: if (-e "$fn.db") {
137: if (tie(%hash,'GDBM_File',"$fn.db",&GDBM_READER,0640)) {
138: # ------------------------------------------------------------------- Hash tied
139: my $firstres=$hash{'map_start_/res/'.$ENV{'request.course.uri'}};
140: my $lastres=$hash{'map_finish_/res/'.$ENV{'request.course.uri'}};
141: if (($firstres) && ($lastres)) {
142: # ----------------------------------------------------------------- Render page
143:
144: @rows=();
145:
146: &tracetable(0,$firstres,'&'.$lastres.'&');
147: if ($hash{'src_'.$lastres}) {
148: my $brepriv=
149: &Apache::lonnet::allowed('bre',$hash{'src_'.$lastres});
150: if (($brepriv eq '2') || ($brepriv eq 'F')) {
151: $rows[$#rows+1]=''.$lastres;
152: }
153: }
154:
155: # ------------------------------------------------------------------ Page parms
156:
157: my $j;
1.5 www 158: my $i;
1.2 www 159: my $lcm=1;
160: my $contents=0;
161:
162: # ---------------------------------------------- Go through table to get layout
163:
164: for ($i=0;$i<=$#rows;$i++) {
165: if ($rows[$i]) {
166: $contents++;
167: my @colcont=split(/\&/,$rows[$i]);
168: $lcm*=($#colcont+1)/euclid($lcm,($#colcont+1));
169: }
170: }
1.5 www 171:
1.2 www 172:
173: unless ($contents) {
174: $r->content_type('text/html');
175: $r->send_http_header;
176: $r->print('<html><body>Empty Map.</body></html>');
177: } else {
178: # ------------------------------------------------------------------ Build page
179:
180: # ---------------------------------------------------------------- Send headers
181:
182: $r->content_type('text/html');
183: $r->send_http_header;
184: $r->print(
185: '<html><head><title>Navigate LON-CAPA Maps</title></head>');
186:
187: $r->print('<body bgcolor="#FFFFFF">'.
1.6 ! www 188: '<img align=right src=/adm/lonIcons/lonlogos.gif>'.
1.2 www 189: '<h1>Navigate Course Map</h1>');
1.3 www 190: $r->rflush();
1.2 www 191: # ----------------------------------------------------------------- Start table
192: $r->print('<table cols="'.$lcm.'" border="0">');
193: for ($i=0;$i<=$#rows;$i++) {
194: if ($rows[$i]) {
195: $r->print("\n<tr>");
196: my @colcont=split(/\&/,$rows[$i]);
197: my $avespan=$lcm/($#colcont+1);
198: for ($j=0;$j<=$#colcont;$j++) {
199: my $rid=$colcont[$j];
1.6 ! www 200: my $add='<td> ';
! 201: if ($rid=~/^h(.+)/) {
! 202: $rid=$1;
! 203: $add='<th bgcolor="#AAFF55">';
! 204: }
! 205: $r->print($add.'<a href="'.
1.2 www 206: $hash{'src_'.$rid}.'">'.
207: $hash{'title_'.$rid}.'</a>');
208: $r->print('</td>');
209: }
210: $r->print('</tr>');
211: }
212: }
213: $r->print("\n</table>");
214:
215: $r->print('</body></html>');
216: # -------------------------------------------------------------------- End page
217: }
218: # ------------------------------------------------------------- End render page
219: } else {
220: $r->content_type('text/html');
221: $r->send_http_header;
222: $r->print('<html><body>Coursemap undefined.</body></html>');
223: }
224: # ------------------------------------------------------------------ Untie hash
225: unless (untie(%hash)) {
226: &Apache::lonnet::logthis("<font color=blue>WARNING: ".
227: "Could not untie coursemap $fn (browse).</font>");
228: }
229: # -------------------------------------------------------------------- All done
230: return OK;
231: # ----------------------------------------------- Errors, hash could no be tied
232: }
233: }
234: }
1.3 www 235:
1.2 www 236: $ENV{'user.error.msg'}="$requrl:bre:0:0:Course not initialized";
237: return HTTP_NOT_ACCEPTABLE;
238: }
1.1 www 239:
240: 1;
241: __END__
1.2 www 242:
243:
244:
245:
246:
247:
248:
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