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: # 10/02,10/10,10/14,10/16,10/18,10/19,10/31,11/6,11/14,11/16 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:
172: my %metalink=();
173:
174: my %cellemb=();
175:
176: my $allscript='';
177: my $allmeta='';
178:
179: my $isxml=0;
180: my $xmlheader='';
181: my $xmlbody='';
182:
183: # --------------------------------------------- Get SSI output, post parameters
184:
185: for ($i=0;$i<=$#rows;$i++) {
186: if ($rows[$i]) {
187: $contents++;
188: my @colcont=split(/\&/,$rows[$i]);
189: $lcm*=($#colcont+1)/euclid($lcm,($#colcont+1));
190: map {
191: my $src=$hash{'src_'.$_};
192: $src=~/\.(\w+)$/;
193: $metalink{$_}=$src.'.meta';
194: $cellemb{$_}=Apache::lonnet::fileembstyle($1);
195: if ($cellemb{$_} eq 'ssi') {
196: # --------------------------------------------------------- This is an SSI cell
197: my $prefix=$_.'_';
198: my %posthash=('request.prefix' => $prefix);
199: if (($ENV{'form.'.$prefix.'submit'})
200: || ($ENV{'form.all_submit'})) {
201: map {
202: if ($_=~/^form.$prefix/) {
203: my $name=$_;
204: $name=~s/^form.$prefix//;
205: $posthash{$name}=$ENV{$_};
206: }
207: } keys %ENV;
208: }
209: my $output=Apache::lonnet::ssi($src,%posthash);
210: my $parser=HTML::TokeParser->new(\$output);
211: my $token;
212: my $thisdir=$src;
213: my $bodydef=0;
214: my $thisxml=0;
215: my @rlinks=();
216: if ($output=~/\?xml/) {
217: $isxml=1;
218: $thisxml=1;
219: $output=~
220: /((?:\<(?:\?xml|\!DOC|html)[^\>]*(?:\>|\>\]\>)\s*)+)\<body[^\>]*\>/si;
221: $xmlheader=$1;
222: }
223: while ($token=$parser->get_token) {
224: if ($token->[0] eq 'S') {
225: if ($token->[1] eq 'a') {
226: if ($token->[2]->{'href'}) {
227: $rlinks[$#rlinks+1]=
228: $token->[2]->{'href'};
229: }
230: } elsif ($token->[1] eq 'img') {
231: $rlinks[$#rlinks+1]=
232: $token->[2]->{'src'};
233: } elsif ($token->[1] eq 'embed') {
234: $rlinks[$#rlinks+1]=
235: $token->[2]->{'src'};
236: } elsif ($token->[1] eq 'base') {
237: $thisdir=$token->[2]->{'href'};
238: } elsif ($token->[1] eq 'body') {
239: $bodydef=1;
240: $ssibgcolor{$_}=$token->[2]->{'bgcolor'};
241: $ssitext{$_}=$token->[2]->{'text'};
242: $ssilink{$_}=$token->[2]->{'link'};
243: $ssivlink{$_}=$token->[2]->{'vlink'};
244: $ssialink{$_}=$token->[2]->{'alink'};
245: if ($thisxml) {
246: $xmlbody=$token->[4];
247: }
248: } elsif ($token->[1] eq 'meta') {
249: $allmeta.="\n".$token->[4].'</meta>';
250: } elsif (($token->[1] eq 'script') &&
251: ($bodydef==0)) {
252: $allscript.="\n\n"
253: .$parser->get_text('/script');
254: }
255: }
256: }
257: if ($output=~/\<body[^\>]*\>(.*)/si) {
258: $output=$1;
259: }
260: $output=~s/\<\/body\>.*//si;
261: if ($output=~/\<form/si) {
262: $nforms++;
263: $output=~s/\<form[^\>]*\>//gsi;
264: $output=~s/\<\/form[^\>]*\>//gsi;
265: $output=~
266: s/\<((?:input|select|button|textarea)[^\>]+)name\s*\=\s*[\'\"]*([\w\.\:]+)[\'\"]*([^\>]*)\>/\<$1 name="$prefix$2" $3\>/gsi;
267: }
268: $thisdir=~s/\/[^\/]*$//;
269: map {
270: unless (($_=~/^http:\/\//i) ||
271: ($_=~/^\//)) {
272: my $newlocation=
273: &Apache::lonnet::hreflocation($thisdir,$_);
274: $output=~s/(\"|\'|\=\s*)$_(\"|\'|\s|\>)/$1$newlocation$2/;
275: }
276: } @rlinks;
277: $output=~s/\<\s*applet/\<applet codebase=\"$thisdir\" /gi;
278: $ssibody{$_}=$output;
279: # ---------------------------------------------------------------- End SSI cell
280: }
281: } @colcont;
282: }
283: }
284: unless ($contents) {
285: $r->content_type('text/html');
286: $r->send_http_header;
287: $r->print('<html><body>Empty page.</body></html>');
288: } else {
289: # ------------------------------------------------------------------ Build page
290:
291: # ---------------------------------------------------------------- Send headers
292: if ($isxml) {
293: $r->content_type('text/xml');
294: $r->send_http_header;
295: $r->print($xmlheader);
296: } else {
297: $r->content_type('text/html');
298: $r->send_http_header;
299: $r->print('<html>');
300: }
301: # ------------------------------------------------------------------------ Head
302: $r->print("\n<head>\n".$allmeta);
303: if ($allscript) {
304: $r->print("\n<script>\n".$allscript."\n</script>\n");
305: }
306: $r->print("\n</head>\n");
307: # ------------------------------------------------------------------ Start body
308: if ($isxml) {
309: $r->print($xmlbody);
310: } else {
311: $r->print('<body bgcolor="#FFFFFF">');
312: }
313: # ------------------------------------------------------------------ Start form
314: if ($nforms) {
315: $r->print('<form method="post" action="'.
316: $requrl.'">');
317: }
318: # ----------------------------------------------------------------- Start table
319: $r->print('<table cols="'.$lcm.'" border="0">');
320: for ($i=0;$i<=$#rows;$i++) {
321: if ($rows[$i]) {
322: $r->print("\n<tr>");
323: my @colcont=split(/\&/,$rows[$i]);
324: my $avespan=$lcm/($#colcont+1);
325: for ($j=0;$j<=$#colcont;$j++) {
326: my $rid=$colcont[$j];
327: my $metainfo='<a href="'.
328: $metalink{$rid}.'" target="LONcatInfo">'.
329: '<img src="/adm/lonMisc/cat_button.gif" border=0>'.
330: '</img></a><br></br>';
331: $r->print('<td colspan="'.$avespan.'"');
332: if ($cellemb{$rid} eq 'ssi') {
333: if ($ssibgcolor{$rid}) {
334: $r->print(' bgcolor="'.
335: $ssibgcolor{$rid}.'"');
336: }
337: $r->print('>'.$metainfo.'<font');
338: if ($ssitext{$rid}) {
339: $r->print(' text="'.$ssitext{$rid}.'"');
340: }
341: if ($ssilink{$rid}) {
342: $r->print(' link="'.$ssilink{$rid}.'"');
343: }
344: if ($ssitext{$rid}) {
345: $r->print(' vlink="'.$ssivlink{$rid}.'"');
346: }
347: if ($ssialink{$rid}) {
348: $r->print(' alink="'.$ssialink{$rid}.'"');
349: }
350:
351: $r->print('>'.$ssibody{$rid}.'</font>');
352: } elsif ($cellemb{$rid} eq 'img') {
353: $r->print('>'.$metainfo.'<img src="'.
354: $hash{'src_'.$rid}.'"></img>');
355: } elsif ($cellemb{$rid} eq 'emb') {
356: $r->print('>'.$metainfo.'<embed src="'.
357: $hash{'src_'.$rid}.'"></embed>');
358: }
359: $r->print('</td>');
360: }
361: $r->print('</tr>');
362: }
363: }
364: $r->print("\n</table>");
365: # ---------------------------------------------------------------- Submit, etc.
366: if ($nforms) {
367: $r->print(
368: '<input name="all_submit" value="Submit All" type="'.
369: (($nforms>1)?'submit':'hidden').'"></input></form>');
370: }
371: $r->print('</body></html>');
372: # -------------------------------------------------------------------- End page
373: }
374: # ------------------------------------------------------------- End render page
375: } else {
376: $r->content_type('text/html');
377: $r->send_http_header;
378: $r->print('<html><body>Page undefined.</body></html>');
379: }
380: # ------------------------------------------------------------------ Untie hash
381: unless (untie(%hash)) {
382: &Apache::lonnet::logthis("<font color=blue>WARNING: ".
383: "Could not untie coursemap $fn (browse).</font>");
384: }
385: # -------------------------------------------------------------------- All done
386: return OK;
387: # ----------------------------------------------- Errors, hash could no be tied
388: }
389: }
390: }
391: $ENV{'user.error.msg'}="$requrl:bre:0:0:Course not initialized";
392: return HTTP_NOT_ACCEPTABLE;
393: }
394:
395: 1;
396: __END__
397:
398:
399:
400:
401:
402:
403:
FreeBSD-CVSweb <freebsd-cvsweb@FreeBSD.org>
![[BACK]](/icons/back.gif){kind=icon}
Return to lonpage.pm CVS log ![[TXT]](/icons/text.gif){kind=icon}
![[DIR]](/icons/dir.gif){kind=icon}
Up to [LON-CAPA] / rat