1: # The LearningOnline Network with CAPA
2: # Page Handler
3: #
4: # (TeX Content Handler
5: #
6: # 05/29/00,05/30 Gerd Kortemeyer)
7: # 08/30,08/31,09/06,09/14,09/15,09/16,09/19,09/20,09/21,09/23,
8: # 10/02,10/10 Gerd Kortemeyer
9:
10: package Apache::lonpage;
11:
12: use strict;
13: use Apache::Constants qw(:common :http);
14: use Apache::lonnet();
15: use HTML::TokeParser;
16: use GDBM_File;
17:
18: # -------------------------------------------------------------- Module Globals
19: my %hash;
20: my @rows;
21:
22: # ------------------------------------------------------------------ Euclid gcd
23:
24: sub euclid {
25: my ($e,$f)=@_;
26: my $a; my $b; my $r;
27: if ($e>$f) { $b=$e; $r=$f; } else { $r=$e; $b=$f; }
28: while ($r!=0) {
29: $a=$b; $b=$r;
30: $r=$a%$b;
31: }
32: return $b;
33: }
34:
35: # ------------------------------------------------------------ Build page table
36:
37: sub tracetable {
38: my ($sofar,$rid,$beenhere)=@_;
39: my $further=$sofar;
40: unless ($beenhere=~/\&$rid\&/) {
41: $beenhere.=$rid.'&';
42:
43: if (defined($hash{'is_map_'.$rid})) {
44: if ((defined($hash{'map_start_'.$hash{'src_'.$rid}})) &&
45: (defined($hash{'map_finish_'.$hash{'src_'.$rid}}))) {
46: my $frid=$hash{'map_finish_'.$hash{'src_'.$rid}};
47: $sofar=
48: &tracetable($sofar,$hash{'map_start_'.$hash{'src_'.$rid}},
49: '&'.$frid.'&');
50: $sofar++;
51: if ($hash{'src_'.$frid}) {
52: my $brepriv=&Apache::lonnet::allowed('bre',$hash{'src_'.$frid});
53: if (($brepriv eq '2') || ($brepriv eq 'F')) {
54: if (defined($rows[$sofar])) {
55: $rows[$sofar].='&'.$frid;
56: } else {
57: $rows[$sofar]=$frid;
58: }
59: }
60: }
61: }
62: } else {
63: $sofar++;
64: if ($hash{'src_'.$rid}) {
65: my $brepriv=&Apache::lonnet::allowed('bre',$hash{'src_'.$rid});
66: if (($brepriv eq '2') || ($brepriv eq 'F')) {
67: if (defined($rows[$sofar])) {
68: $rows[$sofar].='&'.$rid;
69: } else {
70: $rows[$sofar]=$rid;
71: }
72: }
73: }
74: }
75:
76: if (defined($hash{'to_'.$rid})) {
77: my $mincond=1;
78: my $next='';
79: map {
80: my $thiscond=
81: &Apache::lonnet::directcondval($hash{'condid_'.$hash{'undercond_'.$_}});
82: if ($thiscond>=$mincond) {
83: if ($next) {
84: $next.=','.$_.':'.$thiscond;
85: } else {
86: $next=$_.':'.$thiscond;
87: }
88: if ($thiscond>$mincond) { $mincond=$thiscond; }
89: }
90: } split(/\,/,$hash{'to_'.$rid});
91: map {
92: my ($linkid,$condval)=split(/\:/,$_);
93: if ($condval>=$mincond) {
94: my $now=&tracetable($sofar,$hash{'goesto_'.$linkid},$beenhere);
95: if ($now>$further) { $further=$now; }
96: }
97: } split(/\,/,$next);
98:
99: }
100: }
101: return $further;
102: }
103:
104: # ================================================================ Main Handler
105:
106: sub handler {
107: my $r=shift;
108:
109: # ------------------------------------------- Set document type for header only
110:
111: if ($r->header_only) {
112: if ($ENV{'browser.mathml'}) {
113: $r->content_type('text/xml');
114: } else {
115: $r->content_type('text/html');
116: }
117: $r->send_http_header;
118: return OK;
119: }
120:
121: my $requrl=$r->uri;
122: # ----------------------------------------------------------------- Tie db file
123: if ($ENV{'request.course.fn'}) {
124: my $fn=$ENV{'request.course.fn'};
125: if (-e "$fn.db") {
126: if (tie(%hash,'GDBM_File',"$fn.db",&GDBM_READER,0640)) {
127: # ------------------------------------------------------------------- Hash tied
128: my $firstres=$hash{'map_start_'.$requrl};
129: my $lastres=$hash{'map_finish_'.$requrl};
130: if (($firstres) && ($lastres)) {
131: # ----------------------------------------------------------------- Render page
132:
133: @rows=();
134:
135: &tracetable(0,$firstres,'&'.$lastres.'&');
136: if ($hash{'src_'.$lastres}) {
137: my $brepriv=
138: &Apache::lonnet::allowed('bre',$hash{'src_'.$lastres});
139: if (($brepriv eq '2') || ($brepriv eq 'F')) {
140: $rows[$#rows+1]=''.$lastres;
141: }
142: }
143:
144: # ------------------------------------------------------------ Add to symb list
145:
146: my $i;
147: my %symbhash=();
148: for ($i=0;$i<=$#rows;$i++) {
149: if ($rows[$i]) {
150: my @colcont=split(/\&/,$rows[$i]);
151: map {
152: $symbhash{$hash{'src_'.$_}}='';
153: } @colcont;
154: }
155: }
156: &Apache::lonnet::symblist($requrl,%symbhash);
157:
158: # ------------------------------------------------------------------ Page parms
159:
160: my $j;
161: my $lcm=1;
162: my $contents=0;
163: my $nforms=0;
164:
165: my %ssibody=();
166: my %ssibgcolor=();
167: my %ssitext=();
168: my %ssilink=();
169: my %ssivlink=();
170: my %ssialink=();
171: my %cellemb=();
172:
173: my $allscript='';
174: my $allmeta='';
175:
176: my $isxml=0;
177: my $xmlheader='';
178: my $xmlbody='';
179:
180: # --------------------------------------------- Get SSI output, post parameters
181:
182: for ($i=0;$i<=$#rows;$i++) {
183: if ($rows[$i]) {
184: $contents++;
185: my @colcont=split(/\&/,$rows[$i]);
186: $lcm*=($#colcont+1)/euclid($lcm,($#colcont+1));
187: map {
188: my $src=$hash{'src_'.$_};
189: $src=~/\.(\w+)$/;
190: $cellemb{$_}=Apache::lonnet::fileembstyle($1);
191: if ($cellemb{$_} eq 'ssi') {
192: # --------------------------------------------------------- This is an SSI cell
193: my $prefix=$_.'_';
194: my %posthash=('request.prefix' => $prefix);
195: if (($ENV{'form.'.$prefix.'submit'})
196: || ($ENV{'form.all_submit'})) {
197: map {
198: if ($_=~/^form.$prefix/) {
199: my $name=$_;
200: $name=~s/^form.$prefix//;
201: $posthash{$name}=$ENV{$_};
202: }
203: } keys %ENV;
204: }
205: my $output=Apache::lonnet::ssi($src,%posthash);
206: my $parser=HTML::TokeParser->new(\$output);
207: my $token;
208: my $bodydef=0;
209: my $thisxml=0;
210: if ($output=~/\?xml/) {
211: $isxml=1;
212: $thisxml=1;
213: $output=~
214: /((?:\<(?:\?xml|\!DOC|html)[^\>]*(?:\>|\>\]\>)\s*)+)\<body[^\>]*\>/si;
215: $xmlheader=$1;
216: }
217: while (($bodydef==0) &&
218: ($token=$parser->get_token)) {
219: if ($token->[1] eq 'body') {
220: $bodydef=1;
221: $ssibgcolor{$_}=$token->[2]->{'bgcolor'};
222: $ssitext{$_}=$token->[2]->{'text'};
223: $ssilink{$_}=$token->[2]->{'link'};
224: $ssivlink{$_}=$token->[2]->{'vlink'};
225: $ssialink{$_}=$token->[2]->{'alink'};
226: if ($thisxml) {
227: $xmlbody=$token->[4];
228: }
229: }
230: if ($token->[1] eq 'meta') {
231: $allmeta.="\n".$token->[4].'</meta>';
232: }
233: if ($token->[1] eq 'script') {
234: $allscript.="\n\n"
235: .$parser->get_text('/script');
236: }
237: }
238: if ($output=~/\<body[^\>]*\>(.*)/si) {
239: $output=$1;
240: }
241: $output=~s/\<\/body\>.*//si;
242: if ($output=~/\<form/si) {
243: $nforms++;
244: $output=~s/\<form[^\>]*\>//gsi;
245: $output=~s/\<\/form[^\>]*\>//gsi;
246: }
247: $ssibody{$_}=$output;
248:
249: # ---------------------------------------------------------------- End SSI cell
250: }
251: } @colcont;
252: }
253: }
254: unless ($contents) {
255: $r->content_type('text/html');
256: $r->send_http_header;
257: $r->print('<html><body>Empty page.</body></html>');
258: } else {
259: # ------------------------------------------------------------------ Build page
260:
261: # ---------------------------------------------------------------- Send headers
262: if ($isxml) {
263: $r->content_type('text/xml');
264: $r->send_http_header;
265: $r->print($xmlheader);
266: } else {
267: $r->content_type('text/html');
268: $r->send_http_header;
269: $r->print('<html>');
270: }
271: # ------------------------------------------------------------------------ Head
272: $r->print("\n<head>\n".$allmeta);
273: if ($allscript) {
274: $r->print("\n<script>\n".$allscript."\n</script>\n");
275: }
276: $r->print("\n</head>\n");
277: # ------------------------------------------------------------------ Start body
278: if ($isxml) {
279: $r->print($xmlbody);
280: } else {
281: $r->print('<body bgcolor="#FFFFFF">');
282: }
283: # ------------------------------------------------------------------ Start form
284: if ($nforms) {
285: $r->print('<form method="post" action="'.
286: $requrl.'">');
287: }
288: # ----------------------------------------------------------------- Start table
289: $r->print('<table cols="'.$lcm.'" border="0">');
290: for ($i=0;$i<=$#rows;$i++) {
291: if ($rows[$i]) {
292: $r->print("\n<tr>");
293: my @colcont=split(/\&/,$rows[$i]);
294: my $avespan=$lcm/($#colcont+1);
295: for ($j=0;$j<=$#colcont;$j++) {
296: my $rid=$colcont[$j];
297: $r->print('<td colspan="'.$avespan.'"');
298: if ($cellemb{$rid} eq 'ssi') {
299: if ($ssibgcolor{$rid}) {
300: $r->print(' bgcolor="'.
301: $ssibgcolor{$rid}.'"');
302: }
303: $r->print('><font');
304: if ($ssitext{$rid}) {
305: $r->print(' text="'.$ssitext{$rid}.'"');
306: }
307: if ($ssilink{$rid}) {
308: $r->print(' link="'.$ssilink{$rid}.'"');
309: }
310: if ($ssitext{$rid}) {
311: $r->print(' vlink="'.$ssivlink{$rid}.'"');
312: }
313: if ($ssialink{$rid}) {
314: $r->print(' alink="'.$ssialink{$rid}.'"');
315: }
316:
317: $r->print('>'.$ssibody{$rid}.'</font>');
318: } elsif ($cellemb{$rid} eq 'img') {
319: $r->print('><img src="'.
320: $hash{'src_'.$rid}.'"></img>');
321: }
322: $r->print('</td>');
323: }
324: $r->print('</tr>');
325: }
326: }
327: $r->print("\n</table>");
328: # ---------------------------------------------------------------- Submit, etc.
329: if ($nforms) {
330: $r->print(
331: '<input name="all_submit" value="Submit All" type="'.
332: (($nforms>1)?'submit':'hidden').'"></input></form>');
333: }
334: $r->print('</body></html>');
335: # -------------------------------------------------------------------- End page
336: }
337: # ------------------------------------------------------------- End render page
338: } else {
339: $r->content_type('text/html');
340: $r->send_http_header;
341: $r->print('<html><body>Page undefined.</body></html>');
342: }
343: # ------------------------------------------------------------------ Untie hash
344: unless (untie(%hash)) {
345: &Apache::lonnet::logthis("<font color=blue>WARNING: ".
346: "Could not untie coursemap $fn (browse).</font>");
347: }
348: # -------------------------------------------------------------------- All done
349: return OK;
350: # ----------------------------------------------- Errors, hash could no be tied
351: }
352: }
353: }
354: $ENV{'user.error.msg'}="$requrl:bre:0:0:Course not initialized";
355: return HTTP_NOT_ACCEPTABLE;
356: }
357:
358: 1;
359: __END__
360:
361:
362:
363:
364:
365:
366:
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