1: # The LearningOnline Network with CAPA
2: # Page Handler
3: #
4: # $Id: lonpage.pm,v 1.85 2007/09/25 23:47:54 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: use lib '/home/httpd/lib/perl/';
43: use LONCAPA;
44:
45:
46: # -------------------------------------------------------------- Module Globals
47: my %hash;
48: my @rows;
49:
50: # ------------------------------------------------------------------ Euclid gcd
51:
52: sub euclid {
53: my ($e,$f)=@_;
54: my $a; my $b; my $r;
55: if ($e>$f) { $b=$e; $r=$f; } else { $r=$e; $b=$f; }
56: while ($r!=0) {
57: $a=$b; $b=$r;
58: $r=$a%$b;
59: }
60: return $b;
61: }
62:
63: # ------------------------------------------------------------ Build page table
64:
65: sub tracetable {
66: my ($sofar,$rid,$beenhere)=@_;
67: my $further=$sofar;
68: my $randomout=0;
69: unless ($env{'request.role.adv'}) {
70: $randomout = $hash{'randomout_'.$rid};
71: }
72: unless ($beenhere=~/\&$rid\&/) {
73: $beenhere.=$rid.'&';
74: unless ($randomout) {
75: if (defined($hash{'is_map_'.$rid})) {
76: if ((defined($hash{'map_start_'.$hash{'src_'.$rid}})) &&
77: (defined($hash{'map_finish_'.$hash{'src_'.$rid}}))) {
78: my $frid=$hash{'map_finish_'.$hash{'src_'.$rid}};
79: $sofar=
80: &tracetable($sofar,$hash{'map_start_'.$hash{'src_'.$rid}},
81: '&'.$frid.'&');
82: $sofar++;
83: if ($hash{'src_'.$frid}) {
84: my $brepriv=&Apache::lonnet::allowed('bre',$hash{'src_'.$frid});
85: if (($brepriv eq '2') || ($brepriv eq 'F')) {
86: if (defined($rows[$sofar])) {
87: $rows[$sofar].='&'.$frid;
88: } else {
89: $rows[$sofar]=$frid;
90: }
91: }
92: }
93: }
94: } else {
95: $sofar++;
96: if ($hash{'src_'.$rid}) {
97: my $brepriv=&Apache::lonnet::allowed('bre',$hash{'src_'.$rid});
98: if (($brepriv eq '2') || ($brepriv eq 'F')) {
99: if (defined($rows[$sofar])) {
100: $rows[$sofar].='&'.$rid;
101: } else {
102: $rows[$sofar]=$rid;
103: }
104: }
105: }
106: }
107: }
108:
109: if (defined($hash{'to_'.$rid})) {
110: my $mincond=1;
111: my $next='';
112: foreach (split(/\,/,$hash{'to_'.$rid})) {
113: my $thiscond=
114: &Apache::lonnet::directcondval($hash{'condid_'.$hash{'undercond_'.$_}});
115: if ($thiscond>=$mincond) {
116: if ($next) {
117: $next.=','.$_.':'.$thiscond;
118: } else {
119: $next=$_.':'.$thiscond;
120: }
121: if ($thiscond>$mincond) { $mincond=$thiscond; }
122: }
123: }
124: foreach (split(/\,/,$next)) {
125: my ($linkid,$condval)=split(/\:/,$_);
126: if ($condval>=$mincond) {
127: my $now=&tracetable($sofar,$hash{'goesto_'.$linkid},$beenhere);
128: if ($now>$further) { $further=$now; }
129: }
130: }
131: }
132: }
133: return $further;
134: }
135:
136: # ================================================================ Main Handler
137:
138: sub handler {
139: my $r=shift;
140:
141: # ------------------------------------------- Set document type for header only
142:
143: if ($r->header_only) {
144: if ($env{'browser.mathml'}) {
145: &Apache::loncommon::content_type($r,'text/xml');
146: } else {
147: &Apache::loncommon::content_type($r,'text/html');
148: }
149: $r->send_http_header;
150: return OK;
151: }
152:
153: &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},
154: ['forceselect','launch']);
155: my $number_of_columns = 1;
156: my $requrl=$r->uri;
157: my $target = $env{'form.grade_target'};
158: # &Apache::lonnet::logthis("Got a target of $target");
159: if ($target eq 'meta') {
160: &Apache::loncommon::content_type($r,'text/html');
161: $r->send_http_header;
162: return OK;
163: }
164: # ----------------------------------------------------------------- Tie db file
165: if (($env{'request.course.fn'}) && (!$env{'form.forceselect'})) {
166: my $fn=$env{'request.course.fn'};
167: if (-e "$fn.db") {
168: if (tie(%hash,'GDBM_File',"$fn.db",&GDBM_READER(),0640)) {
169: # ------------------------------------------------------------------- Hash tied
170: my $firstres=$hash{'map_start_'.$requrl};
171: my $lastres=$hash{'map_finish_'.$requrl};
172: if (($firstres) && ($lastres)) {
173: # ----------------------------------------------------------------- Render page
174:
175: @rows=();
176:
177: &tracetable(0,$firstres,'&');
178:
179: # ------------------------------------------------------------ Add to symb list
180:
181: my $i;
182: my %symbhash=();
183: for ($i=0;$i<=$#rows;$i++) {
184: if ($rows[$i]) {
185: my @colcont=split(/\&/,$rows[$i]);
186: foreach my $rid (@colcont) {
187: my ($mapid,$resid)=split(/\./,$rid);
188: $symbhash{$hash{'src_'.$rid}}=
189: [$hash{'src_'.$rid},$resid];
190: }
191: }
192: }
193: &Apache::lonnet::symblist($requrl,%symbhash);
194:
195: # ------------------------------------------------------------------ Page parms
196:
197: my $j;
198: my $lcm=1;
199: my $contents=0;
200: my $nforms=0;
201:
202: my %ssibody=();
203: my %ssibgcolor=();
204: my %ssitext=();
205: my %ssilink=();
206: my %ssivlink=();
207: my %ssialink=();
208:
209: my %cellemb=();
210:
211: my $allscript='';
212: my $allmeta='';
213:
214: my $isxml=0;
215: my $xmlheader='';
216: my $xmlbody='';
217:
218: # --------------------------------------------- Get SSI output, post parameters
219:
220: for ($i=0;$i<=$#rows;$i++) {
221: if ($rows[$i]) {
222: $contents++;
223: my @colcont=split(/\&/,$rows[$i]);
224: $lcm*=($#colcont+1)/euclid($lcm,($#colcont+1));
225: foreach (@colcont) {
226: my $src=$hash{'src_'.$_};
227: my ($extension)=($src=~/\.(\w+)$/);
228: if ($hash{'encrypted_'.$_}) {
229: $src=&Apache::lonenc::encrypted($src);
230: }
231: $cellemb{$_}=
232: &Apache::loncommon::fileembstyle($extension);
233: if ($cellemb{$_} eq 'ssi') {
234: # --------------------------------------------------------- This is an SSI cell
235: my ($mapid,$resid)=split(/\./,$_);
236: my $symb=&Apache::lonnet::encode_symb($hash{'map_id_'.$mapid},$resid,$src);
237:
238: my $prefix=$_.'_';
239: my %posthash=('request.prefix' => $prefix,
240: 'LONCAPA_INTERNAL_no_discussion' => 'true',
241: 'symb' => $symb);
242: if ($env{'form.grade_target'} eq 'tex') {
243: $posthash{'grade_target'}=$env{'form.grade_target'};
244: $posthash{'textwidth'}=$env{'form.textwidth'};
245: $posthash{'problem_split'}=$env{'form.problem_split'};
246: $posthash{'latex_type'}=$env{'form.latex_type'};
247: $posthash{'rndseed'}=$env{'form.rndseed'};
248: }
249: my $submitted=exists($env{'form.all_submit'});
250: if (!$submitted) {
251: foreach my $key (keys(%env)) {
252: if ($key=~/^form.\Q$prefix\Esubmit_/) {
253: $submitted=1;last;
254: }
255: }
256: }
257: if ($submitted) {
258: foreach my $key (keys(%env)) {
259: if ($key=~/^form.\Q$prefix\E/) {
260: my $name=$key;
261: $name=~s/^form.\Q$prefix\E//;
262: $posthash{$name}=$env{$key};
263: }
264: }
265: if (exists($env{'form.all_submit'})) {
266: $posthash{'all_submit'}='yes';
267: }
268: }
269: my $output=Apache::lonnet::ssi($src,%posthash);
270: $output=~s|//(\s*<!--)? BEGIN LON-CAPA Internal.+?// END LON-CAPA Internal\s*(-->)?\s||gs;
271: if ($target eq 'tex') {
272: $output =~ s/^([^&]+)\\begin{document}//;
273: $output =~ s/\\end{document}//;
274: $output = '\parbox{\minipagewidth}{ '.$output.' }';
275: #some additional cleanup necessary for LateX (due to limitations of table environment
276: $output =~ s/(\\vskip\s*\d+mm)\s*(\\\\)+/$1/g;
277: }
278: my $parser=HTML::TokeParser->new(\$output);
279: my $token;
280: my $thisdir=$src;
281: my $bodydef=0;
282: my $thisxml=0;
283: my @rlinks=();
284: if ($output=~/\?xml/) {
285: $isxml=1;
286: $thisxml=1;
287: $output=~
288: /((?:\<(?:\?xml|\!DOC|html)[^\>]*(?:\>|\>\]\>)\s*)+)\<body[^\>]*\>/si;
289: $xmlheader=$1;
290: }
291: while ($token=$parser->get_token) {
292: if ($token->[0] eq 'S') {
293: if ($token->[1] eq 'a') {
294: if ($token->[2]->{'href'}) {
295: $rlinks[$#rlinks+1]=
296: $token->[2]->{'href'};
297: }
298: } elsif ($token->[1] eq 'img') {
299: $rlinks[$#rlinks+1]=
300: $token->[2]->{'src'};
301: } elsif ($token->[1] eq 'embed') {
302: $rlinks[$#rlinks+1]=
303: $token->[2]->{'src'};
304: } elsif ($token->[1] eq 'base') {
305: $thisdir=$token->[2]->{'href'};
306: } elsif ($token->[1] eq 'body') {
307: $bodydef=1;
308: $ssibgcolor{$_}=$token->[2]->{'bgcolor'};
309: $ssitext{$_}=$token->[2]->{'text'};
310: $ssilink{$_}=$token->[2]->{'link'};
311: $ssivlink{$_}=$token->[2]->{'vlink'};
312: $ssialink{$_}=$token->[2]->{'alink'};
313: if ($thisxml) {
314: $xmlbody=$token->[4];
315: }
316: } elsif ($token->[1] eq 'meta') {
317: if ($token->[4] !~ m:/>$:) {
318: $allmeta.="\n".$token->[4].'</meta>';
319: } else {
320: $allmeta.="\n".$token->[4];
321: }
322: } elsif (($token->[1] eq 'script') &&
323: ($bodydef==0)) {
324: $allscript.="\n\n"
325: .$parser->get_text('/script');
326: }
327: }
328: }
329: if ($output=~/\<body[^\>]*\>(.*)/si) {
330: $output=$1;
331: }
332: $output=~s/\<\/body\>.*//si;
333: if ($output=~/\<form/si) {
334: $nforms++;
335: $output=~s/\<form[^\>]*\>//gsi;
336: $output=~s/\<\/form[^\>]*\>//gsi;
337: $output=~
338: s/\<((?:input|select|button|textarea)[^\>]+)name\s*\=\s*[\'\"]*([^\'\"]+)[\'\"]*([^\>]*)\>/\<$1 name="$prefix$2" $3\>/gsi;
339: }
340: $thisdir=~s/\/[^\/]*$//;
341: foreach (@rlinks) {
342: unless (($_=~/^http:\/\//i) ||
343: ($_=~/^\//) ||
344: ($_=~/^javascript:/i) ||
345: ($_=~/^mailto:/i) ||
346: ($_=~/^\#/)) {
347: my $newlocation=
348: &Apache::lonnet::hreflocation($thisdir,$_);
349: $output=~s/(\"|\'|\=\s*)$_(\"|\'|\s|\>)/$1$newlocation$2/;
350: }
351: }
352: # -------------------------------------------------- Deal with Applet codebases
353: $output=~s/(\<applet[^\>]+)(codebase\=[^\S\>]+)*([^\>]*)\>/$1.($2?$2:' codebase="'.$thisdir.'"').$3.'>'/gei;
354: $ssibody{$_}=$output;
355: # ---------------------------------------------------------------- End SSI cell
356: }
357: }
358: }
359: }
360: unless ($contents) {
361: &Apache::loncommon::content_type($r,'text/html');
362: $r->send_http_header;
363: $r->print(&Apache::loncommon::start_page(undef,undef,
364: {'force_register' => 1,}));
365: $r->print(&mt('This page is either empty or it only contains resources that are currently hidden').'. ');
366: $r->print('<br /><br />'.&mt('Please use the LON-CAPA navigation arrows to move to another item in the course').
367: &Apache::loncommon::end_page());
368: } else {
369: # ------------------------------------------------------------------ Build page
370:
371: # ---------------------------------------------------------------- Send headers
372: unless ($target eq 'tex') {
373: if ($isxml) {
374: &Apache::loncommon::content_type($r,'text/xml');
375: } else {
376: &Apache::loncommon::content_type($r,'text/html');
377: }
378: $r->send_http_header;
379: # ------------------------------------------------------------------------ Head
380: if ($allscript) {
381: $allscript =
382: "\n".'<script type="text/javascript">'."\n".
383: $allscript.
384: "\n</script>\n";
385: }
386: # ------------------------------------------------------------------ Start body
387: $r->print(&Apache::loncommon::start_page(undef,$allscript,
388: {'force_register' => 1,
389: 'bgcolor' => '#ffffff',}));
390: # ------------------------------------------------------------------ Start form
391: if ($nforms) {
392: $r->print('<form name="lonhomework" method="post" action="'.
393: &Apache::lonenc::check_encrypt($requrl)
394: .'">');
395: }
396: } elsif ($target eq 'tex') {
397: $r->print('\documentclass{article}
398: \newcommand{\keephidden}[1]{}
399: \usepackage[dvips]{graphicx}
400: \usepackage{epsfig}
401: \usepackage{calc}
402: \usepackage{longtable}
403: \begin{document}');
404: }
405: # ----------------------------------------------------------------- Start table
406: if ($target eq 'tex') {
407: $r->print('\begin{longtable}INSERTTHEHEADOFLONGTABLE\endfirsthead\endhead ');
408: if ($number_of_columns le $lcm) {$number_of_columns=$lcm;};
409: } else {
410: $r->print('<table width="100%" cols="'.$lcm.'" border="0">');
411: }
412: # generate rows
413: for ($i=0;$i<=$#rows;$i++) {
414: if ($rows[$i]) {
415: unless ($target eq 'tex') {
416: $r->print("\n<tr>");
417: }
418: my @colcont=split(/\&/,$rows[$i]);
419: my $avespan=$lcm/($#colcont+1);
420: for ($j=0;$j<=$#colcont;$j++) {
421: my $rid=$colcont[$j];
422:
423: my $metainfo =&get_buttons(\%hash,$rid).'<br />';
424: unless ($target eq 'tex') {
425: $r->print('<td colspan="'.$avespan.'"');
426: }
427: if ($cellemb{$rid} eq 'ssi') {
428: unless ($target eq 'tex') {
429: if ($ssibgcolor{$rid}) {
430: $r->print(' bgcolor="'.
431: $ssibgcolor{$rid}.'"');
432: }
433: $r->print('>'.$metainfo.'<font');
434:
435: if ($ssitext{$rid}) {
436: $r->print(' text="'.$ssitext{$rid}.'"');
437: }
438: if ($ssilink{$rid}) {
439: $r->print(' link="'.$ssilink{$rid}.'"');
440: }
441: if ($ssitext{$rid}) {
442: $r->print(' vlink="'.$ssivlink{$rid}.'"');
443: }
444: if ($ssialink{$rid}) {
445: $r->print(' alink="'.$ssialink{$rid}.'"');
446: }
447: $r->print('>');
448: }
449: $r->print($ssibody{$rid});
450: unless ($target eq 'tex') {
451: $r->print('</font>');
452: }
453: if ($env{'course.'.
454: $env{'request.course.id'}.
455: '.pageseparators'} eq 'yes') {
456: unless($target eq 'tex') {
457: $r->print('<hr />');
458: }
459: }
460: } elsif ($cellemb{$rid} eq 'img') {
461: $r->print('>'.$metainfo.'<img src="'.
462: $hash{'src_'.$rid}.'" />');
463: } elsif ($cellemb{$rid} eq 'emb') {
464: $r->print('>'.$metainfo.'<embed src="'.
465: $hash{'src_'.$rid}.'"></embed>');
466: } elsif (&Apache::lonnet::declutter($hash{'src_'.$rid}) !~/\.(sequence|page)$/) {
467: $r->print($metainfo.'<b>'.$hash{'title_'.$rid}.'</b><br />'.
468: &mt('It is recommended that you use an up-to-date virus scanner before handling this file.').'</p><p><table>'.
469: &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 />');
470: }
471: unless ($target eq 'tex') {
472: $r->print('</td>');
473: } else {
474: for (my $incol=1;$incol<=$avespan;$incol++) {
475: $r->print(' & ');
476: }
477: }
478: }
479: unless ($target eq 'tex') {
480: $r->print('</tr>');
481: } else {
482: $r->print('REMOVETHEHEADOFLONGTABLE\\\\');
483: }
484: }
485: }
486: unless ($target eq 'tex') {
487: $r->print("\n</table>");
488: } else {
489: $r->print('\end{longtable}\strut');
490: }
491: # ---------------------------------------------------------------- Submit, etc.
492: if ($nforms) {
493: $r->print(
494: '<input name="all_submit" value="Submit All" type="'.
495: (($nforms>1)?'submit':'hidden').'"></input></form>');
496: }
497: unless ($target eq 'tex') {
498: $r->print(&Apache::loncommon::end_page({'discussion'
499: => 1,}));
500: } else {
501: $r->print('\end{document}'.$number_of_columns);
502: }
503: &Apache::lonnet::symblist($requrl,%symbhash);
504: my ($map,$id,$url)=&Apache::lonnet::decode_symb(&Apache::lonnet::symbread());
505: &Apache::lonnet::symblist($map,'last_known'=>[$url,$id]);
506: # -------------------------------------------------------------------- End page
507: }
508: # ------------------------------------------------------------- End render page
509: } else {
510: &Apache::loncommon::content_type($r,'text/html');
511: $r->send_http_header;
512: &Apache::lonsequence::viewmap($r,$requrl);
513: }
514: # ------------------------------------------------------------------ Untie hash
515: unless (untie(%hash)) {
516: &Apache::lonnet::logthis("<font color=blue>WARNING: ".
517: "Could not untie coursemap $fn (browse).</font>");
518: }
519: # -------------------------------------------------------------------- All done
520: return OK;
521: # ----------------------------------------------- Errors, hash could no be tied
522: }
523: }
524: }
525: &Apache::loncommon::content_type($r,'text/html');
526: $r->send_http_header;
527: &Apache::lonsequence::viewmap($r,$requrl);
528: return OK;
529: }
530:
531: sub get_buttons {
532: my ($hash,$rid) = @_;
533:
534: # which icons do we use?
535: my $extension='png';
536: if ($env{'environment.icons'} eq 'classic') { $extension='gif'; }
537:
538: my $metainfo = '';
539: my $esrc=&Apache::lonnet::declutter($hash->{'src_'.$rid});
540: my ($mapid,$resid)=split(/\./,$rid);
541: my $symb=&Apache::lonnet::encode_symb($hash->{'map_id_'.$mapid},
542: $resid,
543: $hash->{'src_'.$rid});
544: if ($hash->{'encrypted_'.$rid}) {
545: $symb=&Apache::lonenc::encrypted($symb);
546: $esrc=&Apache::lonenc::encrypted($esrc);
547: }
548: if ($hash->{'src_'.$rid} !~ m-^/uploaded/-
549: && !$env{'request.enc'}
550: && ($env{'request.role.adv'}
551: || !$hash->{'encrypted_'.$rid})) {
552: $metainfo .='<a name="'.&escape($symb).'" />'.
553: '<a href="'.$hash->{'src_'.$rid}.'.meta'.'" target="LONcatInfo">'.
554: '<img src="/adm/lonMisc/cat_button.'.$extension.'" class="LC_icon" />'.
555: '</a>';
556: }
557: $metainfo .= '<a href="/adm/evaluate?postdata='.
558: &escape($esrc).
559: '" target="LONcatInfo">'.
560: '<img src="/adm/lonMisc/eval_button.'.$extension.'" class="LC_icon" />'.
561: '</a>';
562: if (($hash->{'src_'.$rid}=~/\.(problem|exam|quiz|assess|survey|form)$/) &&
563: ($hash->{'src_'.$rid} !~ m-^/uploaded/-)) {
564:
565: if (&Apache::lonnet::allowed('mgr',$env{'request.course.id'})) {
566: $metainfo.=
567: '<a href="/adm/grades?symb='.&escape($symb).
568: # '&command=submission" target="LONcatInfo">'.
569: '&command=submission">'.
570: '<img src="/adm/lonMisc/subm_button.'.$extension.'" class="LC_icon" />'.
571: '</a>'.
572: '<a href="/adm/grades?symb='.&escape($symb).
573: # '&command=gradingmenu" target="LONcatInfo">'.
574: '&command=gradingmenu">'.
575: '<img src="/adm/lonMisc/pgrd_button.'.$extension.'" class="LC_icon" />'.
576: '</a>';
577: }
578: if (&Apache::lonnet::allowed('opa',$env{'request.course.id'})) {
579: $metainfo.=
580: '<a href="/adm/parmset?symb='.&escape($symb).
581: # '" target="LONcatInfo">'.
582: '" >'.
583: '<img src="/adm/lonMisc/pprm_button.'.$extension.'" class="LC_icon" />'.
584: '</a>';
585: }
586: }
587: return $metainfo;
588: }
589:
590: 1;
591: __END__
592:
593: =head1 NAME
594:
595: Apache::lonpage - Page Handler
596:
597: =head1 SYNOPSIS
598:
599: Invoked by /etc/httpd/conf/srm.conf:
600:
601: <LocationMatch "^/res/.*\.page$>
602: SetHandler perl-script
603: PerlHandler Apache::lonpage
604: </LocationMatch>
605:
606: =head1 INTRODUCTION
607:
608: This module renders a .page resource.
609:
610: This is part of the LearningOnline Network with CAPA project
611: described at http://www.lon-capa.org.
612:
613: =head1 HANDLER SUBROUTINE
614:
615: This routine is called by Apache and mod_perl.
616:
617: =over 4
618:
619: =item *
620:
621: set document type for header only
622:
623: =item *
624:
625: tie db file
626:
627: =item *
628:
629: render page
630:
631: =item *
632:
633: add to symb list
634:
635: =item *
636:
637: page parms
638:
639: =item *
640:
641: Get SSI output, post parameters
642:
643: =item *
644:
645: SSI cell rendering
646:
647: =item *
648:
649: Deal with Applet codebases
650:
651: =item *
652:
653: Build page
654:
655: =item *
656:
657: send headers
658:
659: =item *
660:
661: start body
662:
663: =item *
664:
665: start form
666:
667: =item *
668:
669: start table
670:
671: =item *
672:
673: submit element, etc, render page, untie hash
674:
675: =back
676:
677: =head1 OTHER SUBROUTINES
678:
679: =over 4
680:
681: =item *
682:
683: euclid() : Euclid's method for determining the greatest common denominator.
684:
685: =item *
686:
687: tracetable() : Build page table.
688:
689: =back
690:
691: =cut
692:
693:
694:
695:
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