1: # The LearningOnline Network with CAPA
2: # Page Handler
3: #
4: # $Id: lonpage.pm,v 1.71 2005/06/29 19:02:14 albertel Exp $
5: #
6: # Copyright Michigan State University Board of Trustees
7: #
8: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
9: #
10: # LON-CAPA is free software; you can redistribute it and/or modify
11: # it under the terms of the GNU General Public License as published by
12: # the Free Software Foundation; either version 2 of the License, or
13: # (at your option) any later version.
14: #
15: # LON-CAPA is distributed in the hope that it will be useful,
16: # but WITHOUT ANY WARRANTY; without even the implied warranty of
17: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18: # GNU General Public License for more details.
19: #
20: # You should have received a copy of the GNU General Public License
21: # along with LON-CAPA; if not, write to the Free Software
22: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23: #
24: # /home/httpd/html/adm/gpl.txt
25: #
26: # http://www.lon-capa.org/
27: #
28: ###
29:
30: package Apache::lonpage;
31:
32: use strict;
33: use Apache::Constants qw(:common :http);
34: use Apache::lonnet;
35: use Apache::loncommon();
36: use Apache::lonxml();
37: use Apache::lonlocal;
38: use Apache::lonmenu;
39: use HTML::TokeParser;
40: use GDBM_File;
41: use Apache::lonsequence;
42:
43: # -------------------------------------------------------------- Module Globals
44: my %hash;
45: my @rows;
46:
47: # ------------------------------------------------------------------ Euclid gcd
48:
49: sub euclid {
50: my ($e,$f)=@_;
51: my $a; my $b; my $r;
52: if ($e>$f) { $b=$e; $r=$f; } else { $r=$e; $b=$f; }
53: while ($r!=0) {
54: $a=$b; $b=$r;
55: $r=$a%$b;
56: }
57: return $b;
58: }
59:
60: # ------------------------------------------------------------ Build page table
61:
62: sub tracetable {
63: my ($sofar,$rid,$beenhere)=@_;
64: my $further=$sofar;
65: my $randomout=0;
66: unless ($env{'request.role.adv'}) {
67: $randomout = $hash{'randomout_'.$rid};
68: }
69: unless ($beenhere=~/\&$rid\&/) {
70: $beenhere.=$rid.'&';
71: unless ($randomout) {
72: if (defined($hash{'is_map_'.$rid})) {
73: if ((defined($hash{'map_start_'.$hash{'src_'.$rid}})) &&
74: (defined($hash{'map_finish_'.$hash{'src_'.$rid}}))) {
75: my $frid=$hash{'map_finish_'.$hash{'src_'.$rid}};
76: $sofar=
77: &tracetable($sofar,$hash{'map_start_'.$hash{'src_'.$rid}},
78: '&'.$frid.'&');
79: $sofar++;
80: if ($hash{'src_'.$frid}) {
81: my $brepriv=&Apache::lonnet::allowed('bre',$hash{'src_'.$frid});
82: if (($brepriv eq '2') || ($brepriv eq 'F')) {
83: if (defined($rows[$sofar])) {
84: $rows[$sofar].='&'.$frid;
85: } else {
86: $rows[$sofar]=$frid;
87: }
88: }
89: }
90: }
91: } else {
92: $sofar++;
93: if ($hash{'src_'.$rid}) {
94: my $brepriv=&Apache::lonnet::allowed('bre',$hash{'src_'.$rid});
95: if (($brepriv eq '2') || ($brepriv eq 'F')) {
96: if (defined($rows[$sofar])) {
97: $rows[$sofar].='&'.$rid;
98: } else {
99: $rows[$sofar]=$rid;
100: }
101: }
102: }
103: }
104: }
105:
106: if (defined($hash{'to_'.$rid})) {
107: my $mincond=1;
108: my $next='';
109: foreach (split(/\,/,$hash{'to_'.$rid})) {
110: my $thiscond=
111: &Apache::lonnet::directcondval($hash{'condid_'.$hash{'undercond_'.$_}});
112: if ($thiscond>=$mincond) {
113: if ($next) {
114: $next.=','.$_.':'.$thiscond;
115: } else {
116: $next=$_.':'.$thiscond;
117: }
118: if ($thiscond>$mincond) { $mincond=$thiscond; }
119: }
120: }
121: foreach (split(/\,/,$next)) {
122: my ($linkid,$condval)=split(/\:/,$_);
123: if ($condval>=$mincond) {
124: my $now=&tracetable($sofar,$hash{'goesto_'.$linkid},$beenhere);
125: if ($now>$further) { $further=$now; }
126: }
127: }
128: }
129: }
130: return $further;
131: }
132:
133: # ================================================================ Main Handler
134:
135: sub handler {
136: my $r=shift;
137:
138: # ------------------------------------------- Set document type for header only
139:
140: if ($r->header_only) {
141: if ($env{'browser.mathml'}) {
142: &Apache::loncommon::content_type($r,'text/xml');
143: } else {
144: &Apache::loncommon::content_type($r,'text/html');
145: }
146: $r->send_http_header;
147: return OK;
148: }
149:
150: &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},
151: ['forceselect','launch']);
152: my $number_of_columns = 1;
153: my $requrl=$r->uri;
154: my $target = $env{'form.grade_target'};
155: # &Apache::lonnet::logthis("Got a target of $target");
156: if ($target eq 'meta') {
157: &Apache::loncommon::content_type($r,'text/html');
158: $r->send_http_header;
159: return OK;
160: }
161: # ----------------------------------------------------------------- Tie db file
162: if (($env{'request.course.fn'}) && (!$env{'form.forceselect'})) {
163: my $fn=$env{'request.course.fn'};
164: if (-e "$fn.db") {
165: if (tie(%hash,'GDBM_File',"$fn.db",&GDBM_READER(),0640)) {
166: # ------------------------------------------------------------------- Hash tied
167: my $firstres=$hash{'map_start_'.$requrl};
168: my $lastres=$hash{'map_finish_'.$requrl};
169: if (($firstres) && ($lastres)) {
170: # ----------------------------------------------------------------- Render page
171:
172: @rows=();
173:
174: &tracetable(0,$firstres,'&');
175:
176: # ------------------------------------------------------------ Add to symb list
177:
178: my $i;
179: my %symbhash=();
180: for ($i=0;$i<=$#rows;$i++) {
181: if ($rows[$i]) {
182: my @colcont=split(/\&/,$rows[$i]);
183: foreach (@colcont) {
184: $symbhash{$hash{'src_'.$_}}=['page','notasymb'];
185: }
186: }
187: }
188: &Apache::lonnet::symblist($requrl,%symbhash);
189:
190: # ------------------------------------------------------------------ Page parms
191:
192: my $j;
193: my $lcm=1;
194: my $contents=0;
195: my $nforms=0;
196:
197: my %ssibody=();
198: my %ssibgcolor=();
199: my %ssitext=();
200: my %ssilink=();
201: my %ssivlink=();
202: my %ssialink=();
203:
204: my %metalink=();
205:
206: my %cellemb=();
207:
208: my $allscript='';
209: my $allmeta='';
210:
211: my $isxml=0;
212: my $xmlheader='';
213: my $xmlbody='';
214:
215: # --------------------------------------------- Get SSI output, post parameters
216:
217: for ($i=0;$i<=$#rows;$i++) {
218: if ($rows[$i]) {
219: $contents++;
220: my @colcont=split(/\&/,$rows[$i]);
221: $lcm*=($#colcont+1)/euclid($lcm,($#colcont+1));
222: foreach (@colcont) {
223: my $src=$hash{'src_'.$_};
224: my ($extension)=($src=~/\.(\w+)$/);
225: if ($hash{'encrypted_'.$_}) {
226: $src=&Apache::lonenc::encrypted($src);
227: }
228: $metalink{$_}=$src.'.meta';
229: $cellemb{$_}=
230: &Apache::loncommon::fileembstyle($extension);
231: if ($cellemb{$_} eq 'ssi') {
232: # --------------------------------------------------------- This is an SSI cell
233: my ($mapid,$resid)=split(/\./,$_);
234: my $symb=&Apache::lonnet::encode_symb($hash{'map_id_'.$mapid},$resid,$src);
235:
236: my $prefix=$_.'_';
237: my %posthash=('request.prefix' => $prefix,
238: 'LONCAPA_INTERNAL_no_discussion' => 'true',
239: 'symb' => $symb);
240: if ($env{'form.grade_target'} eq 'tex') {
241: $posthash{'grade_target'}=$env{'form.grade_target'};
242: $posthash{'textwidth'}=$env{'form.textwidth'};
243: $posthash{'problem_split'}=$env{'form.problem_split'};
244: $posthash{'latex_type'}=$env{'form.latex_type'};
245: $posthash{'rndseed'}=$env{'form.rndseed'};
246: }
247: if (($env{'form.'.$prefix.'submit'})
248: || ($env{'form.all_submit'})) {
249: foreach (keys %env) {
250: if ($_=~/^form.$prefix/) {
251: my $name=$_;
252: $name=~s/^form.$prefix//;
253: $posthash{$name}=$env{$_};
254: }
255: }
256: }
257: my $output=Apache::lonnet::ssi($src,%posthash);
258: $output=~s|//(\s*<!--)? BEGIN LON-CAPA Internal.+// END LON-CAPA Internal\s*(-->)?\s||gs;
259: if ($target eq 'tex') {
260: $output =~ s/^([^&]+)\\begin{document}//;
261: $output =~ s/\\end{document}//;
262: $output = '\parbox{\minipagewidth}{ '.$output.' }';
263: #some additional cleanup necessary for LateX (due to limitations of table environment
264: $output =~ s/(\\vskip\s*\d+mm)\s*(\\\\)+/$1/g;
265: }
266: my $parser=HTML::TokeParser->new(\$output);
267: my $token;
268: my $thisdir=$src;
269: my $bodydef=0;
270: my $thisxml=0;
271: my @rlinks=();
272: if ($output=~/\?xml/) {
273: $isxml=1;
274: $thisxml=1;
275: $output=~
276: /((?:\<(?:\?xml|\!DOC|html)[^\>]*(?:\>|\>\]\>)\s*)+)\<body[^\>]*\>/si;
277: $xmlheader=$1;
278: }
279: while ($token=$parser->get_token) {
280: if ($token->[0] eq 'S') {
281: if ($token->[1] eq 'a') {
282: if ($token->[2]->{'href'}) {
283: $rlinks[$#rlinks+1]=
284: $token->[2]->{'href'};
285: }
286: } elsif ($token->[1] eq 'img') {
287: $rlinks[$#rlinks+1]=
288: $token->[2]->{'src'};
289: } elsif ($token->[1] eq 'embed') {
290: $rlinks[$#rlinks+1]=
291: $token->[2]->{'src'};
292: } elsif ($token->[1] eq 'base') {
293: $thisdir=$token->[2]->{'href'};
294: } elsif ($token->[1] eq 'body') {
295: $bodydef=1;
296: $ssibgcolor{$_}=$token->[2]->{'bgcolor'};
297: $ssitext{$_}=$token->[2]->{'text'};
298: $ssilink{$_}=$token->[2]->{'link'};
299: $ssivlink{$_}=$token->[2]->{'vlink'};
300: $ssialink{$_}=$token->[2]->{'alink'};
301: if ($thisxml) {
302: $xmlbody=$token->[4];
303: }
304: } elsif ($token->[1] eq 'meta') {
305: if ($token->[4] !~ m:/>$:) {
306: $allmeta.="\n".$token->[4].'</meta>';
307: } else {
308: $allmeta.="\n".$token->[4];
309: }
310: } elsif (($token->[1] eq 'script') &&
311: ($bodydef==0)) {
312: $allscript.="\n\n"
313: .$parser->get_text('/script');
314: }
315: }
316: }
317: if ($output=~/\<body[^\>]*\>(.*)/si) {
318: $output=$1;
319: }
320: $output=~s/\<\/body\>.*//si;
321: if ($output=~/\<form/si) {
322: $nforms++;
323: $output=~s/\<form[^\>]*\>//gsi;
324: $output=~s/\<\/form[^\>]*\>//gsi;
325: $output=~
326: s/\<((?:input|select|button|textarea)[^\>]+)name\s*\=\s*[\'\"]*([\w\.\:]+)[\'\"]*([^\>]*)\>/\<$1 name="$prefix$2" $3\>/gsi;
327: }
328: $thisdir=~s/\/[^\/]*$//;
329: foreach (@rlinks) {
330: unless (($_=~/^http:\/\//i) ||
331: ($_=~/^\//) ||
332: ($_=~/^javascript:/i) ||
333: ($_=~/^mailto:/i) ||
334: ($_=~/^\#/)) {
335: my $newlocation=
336: &Apache::lonnet::hreflocation($thisdir,$_);
337: $output=~s/(\"|\'|\=\s*)$_(\"|\'|\s|\>)/$1$newlocation$2/;
338: }
339: }
340: # -------------------------------------------------- Deal with Applet codebases
341: $output=~s/(\<applet[^\>]+)(codebase\=[^\S\>]+)*([^\>]*)\>/$1.($2?$2:' codebase="'.$thisdir.'"').$3.'>'/gei;
342: $ssibody{$_}=$output;
343: # ---------------------------------------------------------------- End SSI cell
344: }
345: }
346: }
347: }
348: unless ($contents) {
349: &Apache::loncommon::content_type($r,'text/html');
350: $r->send_http_header;
351: $r->print('<html>'."\n".
352: '<head>'."\n".
353: &Apache::lonmenu::registerurl(1,undef)."\n".
354: '</head>'."\n".
355: '<body bgcolor="#FFFFFF" onLoad="'
356: .&Apache::lonmenu::loadevents.
357: '" onUnload="'.&Apache::lonmenu::unloadevents.'">'.
358: &Apache::lonmenu::menubuttons(undef,$target,1)
359: );
360: $r->print(&mt('This page is either empty or it only contains resources that are currently hidden').'. ');
361: $r->print('<br /><br />'.&mt('Please use the LON-CAPA navigation arrows to move to another item in the course').'.</body></html>');
362: } else {
363: # ------------------------------------------------------------------ Build page
364:
365: # ---------------------------------------------------------------- Send headers
366: unless ($target eq 'tex') {
367: if ($isxml) {
368: &Apache::loncommon::content_type($r,'text/xml');
369: $r->send_http_header;
370: $r->print($xmlheader);
371: } else {
372: &Apache::loncommon::content_type($r,'text/html');
373: $r->send_http_header;
374: $r->print('<html>');
375: }
376: # ------------------------------------------------------------------------ Head
377: $r->print("\n<head>\n".$allmeta);
378: if ($allscript) {
379: $r->print("\n<script language='JavaScript'>\n".
380: $allscript."\n</script>\n");
381: }
382: $r->print(&Apache::lonmenu::registerurl(1,undef));
383: $r->print("\n</head>\n");
384: # ------------------------------------------------------------------ Start body
385: if ($isxml) {
386: $r->print($xmlbody);
387: } else {
388: $r->print(
389: '<body bgcolor="#FFFFFF" onLoad="'.&Apache::lonmenu::loadevents.
390: '" onUnload="'.&Apache::lonmenu::unloadevents.'">'.
391: &Apache::lonmenu::menubuttons(undef,$target,1)
392: );
393: }
394: # ------------------------------------------------------------------ Start form
395: if ($nforms) {
396: $r->print('<form method="post" action="'.
397: &Apache::lonenc::check_encrypt($requrl)
398: .'">');
399: }
400: } elsif ($target eq 'tex') {
401: $r->print('\documentclass{article}
402: \newcommand{\keephidden}[1]{}
403: \usepackage[dvips]{graphicx}
404: \usepackage{epsfig}
405: \usepackage{calc}
406: \usepackage{longtable}
407: \begin{document}');
408: }
409: # ----------------------------------------------------------------- Start table
410: if ($target eq 'tex') {
411: $r->print('\begin{longtable}INSERTTHEHEADOFLONGTABLE\endfirsthead\endhead ');
412: if ($number_of_columns le $lcm) {$number_of_columns=$lcm;};
413: } else {
414: $r->print('<table width="100%" cols="'.$lcm.'" border="0">');
415: }
416: for ($i=0;$i<=$#rows;$i++) {
417: if ($rows[$i]) {
418: unless ($target eq 'tex') {
419: $r->print("\n<tr>");
420: }
421: my @colcont=split(/\&/,$rows[$i]);
422: my $avespan=$lcm/($#colcont+1);
423: for ($j=0;$j<=$#colcont;$j++) {
424: my $rid=$colcont[$j];
425: my $metainfo = '';
426: my $esrc=&Apache::lonnet::declutter($hash{'src_'.$rid});
427: my ($mapid,$resid)=split(/\./,$rid);
428: my $symb=&Apache::lonnet::encode_symb($hash{'map_id_'.$mapid},$resid,$hash{'src_'.$rid});
429: if ($hash{'encrypted_'.$rid}) {
430: $symb=&Apache::lonenc::encrypted($symb);
431: $esrc=&Apache::lonenc::encrypted($esrc);
432: }
433: unless ($hash{'src_'.$rid} =~ m-^/uploaded/-) {
434: $metainfo ='<a name="'.&Apache::lonnet::escape($symb).'" />'.
435: '<a href="'.$metalink{$rid}.'" target="LONcatInfo">'.
436: '<img src="/adm/lonMisc/cat_button.gif" border=0>'.
437: '</img></a>';
438: }
439: $metainfo .= '<a href="/adm/evaluate?postdata='.
440: &Apache::lonnet::escape($esrc).
441: '" target="LONcatInfo">'.
442: '<img src="/adm/lonMisc/eval_button.gif" border=0>'.
443: '</img></a>';
444: if (
445: ($hash{'src_'.$rid}=~/\.(problem|exam|quiz|assess|survey|form)$/) &&
446: (&Apache::lonnet::allowed('mgr',$env{'request.course.id'})) &&
447: ($hash{'src_'.$rid} !~ m-^/uploaded/-)) {
448: my ($mapid,$resid)=split(/\./,$rid);
449: my $symb=
450: &Apache::lonnet::declutter($hash{'map_id_'.$mapid}).
451: '___'.$resid.'___'.
452: &Apache::lonnet::declutter($hash{'src_'.$rid});
453: $metainfo.=
454: '<a href="/adm/grades?symb='.&Apache::lonnet::escape($symb).
455: # '&command=submission" target="LONcatInfo">'.
456: '&command=submission">'.
457: '<img src="/adm/lonMisc/subm_button.gif" border=0>'.
458: '</img></a>'.
459: '<a href="/adm/grades?symb='.&Apache::lonnet::escape($symb).
460: # '&command=gradingmenu" target="LONcatInfo">'.
461: '&command=gradingmenu">'.
462: '<img src="/adm/lonMisc/pgrd_button.gif" border=0>'.
463: '</img></a>'.
464: '<a href="/adm/parmset?symb='.&Apache::lonnet::escape($symb).
465: # '" target="LONcatInfo">'.
466: '" >'.
467: '<img src="/adm/lonMisc/pprm_button.gif" border=0>'.
468: '</img></a>';
469: }
470: $metainfo.='<br></br>';
471: unless ($target eq 'tex') {
472: $r->print('<td colspan="'.$avespan.'"');
473: }
474: if ($cellemb{$rid} eq 'ssi') {
475: unless ($target eq 'tex') {
476: if ($ssibgcolor{$rid}) {
477: $r->print(' bgcolor="'.
478: $ssibgcolor{$rid}.'"');
479: }
480: $r->print('>'.$metainfo.'<font');
481:
482: if ($ssitext{$rid}) {
483: $r->print(' text="'.$ssitext{$rid}.'"');
484: }
485: if ($ssilink{$rid}) {
486: $r->print(' link="'.$ssilink{$rid}.'"');
487: }
488: if ($ssitext{$rid}) {
489: $r->print(' vlink="'.$ssivlink{$rid}.'"');
490: }
491: if ($ssialink{$rid}) {
492: $r->print(' alink="'.$ssialink{$rid}.'"');
493: }
494: $r->print('>');
495: }
496: $r->print($ssibody{$rid});
497: unless ($target eq 'tex') {
498: $r->print('</font>');
499: }
500: if ($env{'course.'.
501: $env{'request.course.id'}.
502: '.pageseparators'} eq 'yes') {
503: unless($target eq 'tex') {
504: $r->print('<hr />');
505: } else {
506: $r->print('\hline');
507: }
508: }
509: } elsif ($cellemb{$rid} eq 'img') {
510: $r->print('>'.$metainfo.'<img src="'.
511: $hash{'src_'.$rid}.'"></img>');
512: } elsif ($cellemb{$rid} eq 'emb') {
513: $r->print('>'.$metainfo.'<embed src="'.
514: $hash{'src_'.$rid}.'"></embed>');
515: } elsif (&Apache::lonnet::declutter($hash{'src_'.$rid}) !~/\.(sequence|page)$/) {
516: $r->print($metainfo.'<b>'.$hash{'title_'.$rid}.'</b><br />'.
517: &mt('It is recommended that you use an up-to-date virus scanner before handling this file.').'</p><p><table>'.
518: &Apache::londocs::entryline(0,&mt("Click to download or use your browser's Save Link function"),'/'.&Apache::lonnet::declutter($hash{'src_'.$rid})).'</table></p><br />');
519: }
520: unless ($target eq 'tex') {
521: $r->print('</td>');
522: } else {
523: for (my $incol=1;$incol<=$avespan;$incol++) {
524: $r->print(' & ');
525: }
526: }
527: }
528: unless ($target eq 'tex') {
529: $r->print('</tr>');
530: } else {
531: $r->print('REMOVETHEHEADOFLONGTABLE\\\\');
532: }
533: }
534: }
535: unless ($target eq 'tex') {
536: $r->print("\n</table>");
537: } else {
538: $r->print('\end{longtable}\strut');
539: }
540: # ---------------------------------------------------------------- Submit, etc.
541: if ($nforms) {
542: $r->print(
543: '<input name="all_submit" value="Submit All" type="'.
544: (($nforms>1)?'submit':'hidden').'"></input></form>');
545: }
546: unless ($target eq 'tex') {
547: $r->print('</body>'.&Apache::lonxml::xmlend());
548: } else {
549: $r->print('\end{document}'.$number_of_columns);
550: }
551: &Apache::lonnet::symblist($requrl,%symbhash);
552: my ($map,$id,$url)=&Apache::lonnet::decode_symb(&Apache::lonnet::symbread());
553: &Apache::lonnet::symblist($map,'last_known'=>[$url,$id]);
554: # -------------------------------------------------------------------- End page
555: }
556: # ------------------------------------------------------------- End render page
557: } else {
558: &Apache::loncommon::content_type($r,'text/html');
559: $r->send_http_header;
560: &Apache::lonsequence::viewmap($r,$requrl);
561: }
562: # ------------------------------------------------------------------ Untie hash
563: unless (untie(%hash)) {
564: &Apache::lonnet::logthis("<font color=blue>WARNING: ".
565: "Could not untie coursemap $fn (browse).</font>");
566: }
567: # -------------------------------------------------------------------- All done
568: return OK;
569: # ----------------------------------------------- Errors, hash could no be tied
570: }
571: }
572: }
573: &Apache::loncommon::content_type($r,'text/html');
574: $r->send_http_header;
575: &Apache::lonsequence::viewmap($r,$requrl);
576: return OK;
577: }
578:
579: 1;
580: __END__
581:
582: =head1 NAME
583:
584: Apache::lonpage - Page Handler
585:
586: =head1 SYNOPSIS
587:
588: Invoked by /etc/httpd/conf/srm.conf:
589:
590: <LocationMatch "^/res/.*\.page$>
591: SetHandler perl-script
592: PerlHandler Apache::lonpage
593: </LocationMatch>
594:
595: =head1 INTRODUCTION
596:
597: This module renders a .page resource.
598:
599: This is part of the LearningOnline Network with CAPA project
600: described at http://www.lon-capa.org.
601:
602: =head1 HANDLER SUBROUTINE
603:
604: This routine is called by Apache and mod_perl.
605:
606: =over 4
607:
608: =item *
609:
610: set document type for header only
611:
612: =item *
613:
614: tie db file
615:
616: =item *
617:
618: render page
619:
620: =item *
621:
622: add to symb list
623:
624: =item *
625:
626: page parms
627:
628: =item *
629:
630: Get SSI output, post parameters
631:
632: =item *
633:
634: SSI cell rendering
635:
636: =item *
637:
638: Deal with Applet codebases
639:
640: =item *
641:
642: Build page
643:
644: =item *
645:
646: send headers
647:
648: =item *
649:
650: start body
651:
652: =item *
653:
654: start form
655:
656: =item *
657:
658: start table
659:
660: =item *
661:
662: submit element, etc, render page, untie hash
663:
664: =back
665:
666: =head1 OTHER SUBROUTINES
667:
668: =over 4
669:
670: =item *
671:
672: euclid() : Euclid's method for determining the greatest common denominator.
673:
674: =item *
675:
676: tracetable() : Build page table.
677:
678: =back
679:
680: =cut
681:
682:
683:
684:
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