1: # The LearningOnline Network with CAPA
2: # Page Handler
3: #
4: # $Id: lonpage.pm,v 1.63 2004/12/10 19:29:19 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: # (TeX Content Handler
29: #
30: # YEAR=2000
31: # 05/29/00,05/30 Gerd Kortemeyer)
32: # 08/30,08/31,09/06,09/14,09/15,09/16,09/19,09/20,09/21,09/23,
33: # 10/02,10/10,10/14,10/16,10/18,10/19,10/31,11/6,11/14,11/16,
34: # YEAR=2001
35: # 08/13/01,08/30,10/1 Gerd Kortemeyer
36: # YEAR=2002
37: # 03/19 Gerd Kortemeyer
38: #
39: ###
40:
41: package Apache::lonpage;
42:
43: use strict;
44: use Apache::Constants qw(:common :http);
45: use Apache::lonnet();
46: use Apache::loncommon();
47: use Apache::lonxml();
48: use Apache::lonlocal;
49: use Apache::lonmenu;
50: use HTML::TokeParser;
51: use GDBM_File;
52: use Apache::lonsequence;
53:
54: # -------------------------------------------------------------- Module Globals
55: my %hash;
56: my @rows;
57:
58: # ------------------------------------------------------------------ Euclid gcd
59:
60: sub euclid {
61: my ($e,$f)=@_;
62: my $a; my $b; my $r;
63: if ($e>$f) { $b=$e; $r=$f; } else { $r=$e; $b=$f; }
64: while ($r!=0) {
65: $a=$b; $b=$r;
66: $r=$a%$b;
67: }
68: return $b;
69: }
70:
71: # ------------------------------------------------------------ Build page table
72:
73: sub tracetable {
74: my ($sofar,$rid,$beenhere)=@_;
75: my $further=$sofar;
76: my $randomout=0;
77: unless ($ENV{'request.role.adv'}) {
78: $randomout = $hash{'randomout_'.$rid};
79: }
80: unless ($beenhere=~/\&$rid\&/) {
81: $beenhere.=$rid.'&';
82: unless ($randomout) {
83: if (defined($hash{'is_map_'.$rid})) {
84: if ((defined($hash{'map_start_'.$hash{'src_'.$rid}})) &&
85: (defined($hash{'map_finish_'.$hash{'src_'.$rid}}))) {
86: my $frid=$hash{'map_finish_'.$hash{'src_'.$rid}};
87: $sofar=
88: &tracetable($sofar,$hash{'map_start_'.$hash{'src_'.$rid}},
89: '&'.$frid.'&');
90: $sofar++;
91: if ($hash{'src_'.$frid}) {
92: my $brepriv=&Apache::lonnet::allowed('bre',$hash{'src_'.$frid});
93: if (($brepriv eq '2') || ($brepriv eq 'F')) {
94: if (defined($rows[$sofar])) {
95: $rows[$sofar].='&'.$frid;
96: } else {
97: $rows[$sofar]=$frid;
98: }
99: }
100: }
101: }
102: } else {
103: $sofar++;
104: if ($hash{'src_'.$rid}) {
105: my $brepriv=&Apache::lonnet::allowed('bre',$hash{'src_'.$rid});
106: if (($brepriv eq '2') || ($brepriv eq 'F')) {
107: if (defined($rows[$sofar])) {
108: $rows[$sofar].='&'.$rid;
109: } else {
110: $rows[$sofar]=$rid;
111: }
112: }
113: }
114: }
115: }
116:
117: if (defined($hash{'to_'.$rid})) {
118: my $mincond=1;
119: my $next='';
120: foreach (split(/\,/,$hash{'to_'.$rid})) {
121: my $thiscond=
122: &Apache::lonnet::directcondval($hash{'condid_'.$hash{'undercond_'.$_}});
123: if ($thiscond>=$mincond) {
124: if ($next) {
125: $next.=','.$_.':'.$thiscond;
126: } else {
127: $next=$_.':'.$thiscond;
128: }
129: if ($thiscond>$mincond) { $mincond=$thiscond; }
130: }
131: }
132: foreach (split(/\,/,$next)) {
133: my ($linkid,$condval)=split(/\:/,$_);
134: if ($condval>=$mincond) {
135: my $now=&tracetable($sofar,$hash{'goesto_'.$linkid},$beenhere);
136: if ($now>$further) { $further=$now; }
137: }
138: }
139: }
140: }
141: return $further;
142: }
143:
144: # ================================================================ Main Handler
145:
146: sub handler {
147: my $r=shift;
148:
149: # ------------------------------------------- Set document type for header only
150:
151: if ($r->header_only) {
152: if ($ENV{'browser.mathml'}) {
153: &Apache::loncommon::content_type($r,'text/xml');
154: } else {
155: &Apache::loncommon::content_type($r,'text/html');
156: }
157: $r->send_http_header;
158: return OK;
159: }
160:
161: &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},
162: ['forceselect','launch']);
163: my $number_of_columns = 1;
164: my $requrl=$r->uri;
165: my $target = $ENV{'form.grade_target'};
166: # &Apache::lonnet::logthis("Got a target of $target");
167: if ($target eq 'meta') {
168: &Apache::loncommon::content_type($r,'text/html');
169: $r->send_http_header;
170: return OK;
171: }
172: # ----------------------------------------------------------------- Tie db file
173: if (($ENV{'request.course.fn'}) && (!$ENV{'form.forceselect'})) {
174: my $fn=$ENV{'request.course.fn'};
175: if (-e "$fn.db") {
176: if (tie(%hash,'GDBM_File',"$fn.db",&GDBM_READER(),0640)) {
177: # ------------------------------------------------------------------- Hash tied
178: my $firstres=$hash{'map_start_'.$requrl};
179: my $lastres=$hash{'map_finish_'.$requrl};
180: if (($firstres) && ($lastres)) {
181: # ----------------------------------------------------------------- Render page
182:
183: @rows=();
184:
185: &tracetable(0,$firstres,'&');
186:
187: # ------------------------------------------------------------ Add to symb list
188:
189: my $i;
190: my %symbhash=();
191: for ($i=0;$i<=$#rows;$i++) {
192: if ($rows[$i]) {
193: my @colcont=split(/\&/,$rows[$i]);
194: foreach (@colcont) {
195: $symbhash{$hash{'src_'.$_}}='';
196: }
197: }
198: }
199: &Apache::lonnet::symblist($requrl,%symbhash);
200:
201: # ------------------------------------------------------------------ Page parms
202:
203: my $j;
204: my $lcm=1;
205: my $contents=0;
206: my $nforms=0;
207:
208: my %ssibody=();
209: my %ssibgcolor=();
210: my %ssitext=();
211: my %ssilink=();
212: my %ssivlink=();
213: my %ssialink=();
214:
215: my %metalink=();
216:
217: my %cellemb=();
218:
219: my $allscript='';
220: my $allmeta='';
221:
222: my $isxml=0;
223: my $xmlheader='';
224: my $xmlbody='';
225:
226: # --------------------------------------------- Get SSI output, post parameters
227:
228: for ($i=0;$i<=$#rows;$i++) {
229: if ($rows[$i]) {
230: $contents++;
231: my @colcont=split(/\&/,$rows[$i]);
232: $lcm*=($#colcont+1)/euclid($lcm,($#colcont+1));
233: foreach (@colcont) {
234: my $src=$hash{'src_'.$_};
235: my ($extension)=($src=~/\.(\w+)$/);
236: if ($hash{'encrypted_'.$_}) {
237: $src=&Apache::lonenc::encrypted($src);
238: }
239: $metalink{$_}=$src.'.meta';
240: $cellemb{$_}=
241: &Apache::loncommon::fileembstyle($extension);
242: if ($cellemb{$_} eq 'ssi') {
243: # --------------------------------------------------------- This is an SSI cell
244: my $prefix=$_.'_';
245: my %posthash=('request.prefix' => $prefix);
246: if ($ENV{'form.grade_target'} eq 'tex') {
247: $posthash{'grade_target'}=$ENV{'form.grade_target'};
248: $posthash{'textwidth'}=$ENV{'form.textwidth'};
249: $posthash{'problem_split'}=$ENV{'form.problem_split'};
250: $posthash{'latex_type'}=$ENV{'form.latex_type'};
251: $posthash{'rndseed'}=$ENV{'form.rndseed'};
252: }
253: if (($ENV{'form.'.$prefix.'submit'})
254: || ($ENV{'form.all_submit'})) {
255: foreach (keys %ENV) {
256: if ($_=~/^form.$prefix/) {
257: my $name=$_;
258: $name=~s/^form.$prefix//;
259: $posthash{$name}=$ENV{$_};
260: }
261: }
262: }
263: my $output=Apache::lonnet::ssi($src,%posthash);
264: $output=~s|//(\s*<!--)? BEGIN LON-CAPA Internal.+// END LON-CAPA Internal\s*(-->)?\s||gs;
265: if ($target eq 'tex') {
266: $output =~ s/^([^&]+)\\begin{document}//;
267: $output =~ s/\\end{document}//;
268: $output = '\parbox{\minipagewidth}{ '.$output.' }';
269: #some additional cleanup necessary for LateX (due to limitations of table environment
270: $output =~ s/(\\vskip\s*\d+mm)\s*(\\\\)+/$1/g;
271: }
272: my $parser=HTML::TokeParser->new(\$output);
273: my $token;
274: my $thisdir=$src;
275: my $bodydef=0;
276: my $thisxml=0;
277: my @rlinks=();
278: if ($output=~/\?xml/) {
279: $isxml=1;
280: $thisxml=1;
281: $output=~
282: /((?:\<(?:\?xml|\!DOC|html)[^\>]*(?:\>|\>\]\>)\s*)+)\<body[^\>]*\>/si;
283: $xmlheader=$1;
284: }
285: while ($token=$parser->get_token) {
286: if ($token->[0] eq 'S') {
287: if ($token->[1] eq 'a') {
288: if ($token->[2]->{'href'}) {
289: $rlinks[$#rlinks+1]=
290: $token->[2]->{'href'};
291: }
292: } elsif ($token->[1] eq 'img') {
293: $rlinks[$#rlinks+1]=
294: $token->[2]->{'src'};
295: } elsif ($token->[1] eq 'embed') {
296: $rlinks[$#rlinks+1]=
297: $token->[2]->{'src'};
298: } elsif ($token->[1] eq 'base') {
299: $thisdir=$token->[2]->{'href'};
300: } elsif ($token->[1] eq 'body') {
301: $bodydef=1;
302: $ssibgcolor{$_}=$token->[2]->{'bgcolor'};
303: $ssitext{$_}=$token->[2]->{'text'};
304: $ssilink{$_}=$token->[2]->{'link'};
305: $ssivlink{$_}=$token->[2]->{'vlink'};
306: $ssialink{$_}=$token->[2]->{'alink'};
307: if ($thisxml) {
308: $xmlbody=$token->[4];
309: }
310: } elsif ($token->[1] eq 'meta') {
311: if ($token->[4] !~ m:/>$:) {
312: $allmeta.="\n".$token->[4].'</meta>';
313: } else {
314: $allmeta.="\n".$token->[4];
315: }
316: } elsif (($token->[1] eq 'script') &&
317: ($bodydef==0)) {
318: $allscript.="\n\n"
319: .$parser->get_text('/script');
320: }
321: }
322: }
323: if ($output=~/\<body[^\>]*\>(.*)/si) {
324: $output=$1;
325: }
326: $output=~s/\<\/body\>.*//si;
327: if ($output=~/\<form/si) {
328: $nforms++;
329: $output=~s/\<form[^\>]*\>//gsi;
330: $output=~s/\<\/form[^\>]*\>//gsi;
331: $output=~
332: s/\<((?:input|select|button|textarea)[^\>]+)name\s*\=\s*[\'\"]*([\w\.\:]+)[\'\"]*([^\>]*)\>/\<$1 name="$prefix$2" $3\>/gsi;
333: }
334: $thisdir=~s/\/[^\/]*$//;
335: foreach (@rlinks) {
336: unless (($_=~/^http:\/\//i) ||
337: ($_=~/^\//) ||
338: ($_=~/^javascript:/i) ||
339: ($_=~/^mailto:/i) ||
340: ($_=~/^\#/)) {
341: my $newlocation=
342: &Apache::lonnet::hreflocation($thisdir,$_);
343: $output=~s/(\"|\'|\=\s*)$_(\"|\'|\s|\>)/$1$newlocation$2/;
344: }
345: }
346: # -------------------------------------------------- Deal with Applet codebases
347: $output=~s/(\<applet[^\>]+)(codebase\=[^\S\>]+)*([^\>]*)\>/$1.($2?$2:' codebase="'.$thisdir.'"').$3.'>'/gei;
348: $ssibody{$_}=$output;
349: # ---------------------------------------------------------------- End SSI cell
350: }
351: }
352: }
353: }
354: unless ($contents) {
355: &Apache::loncommon::content_type($r,'text/html');
356: $r->send_http_header;
357: $r->print('<html>'."\n".
358: '<head>'."\n".
359: &Apache::lonmenu::registerurl(1,undef)."\n".
360: '</head>'."\n".
361: '<body bgcolor="#FFFFFF" onLoad="'
362: .&Apache::lonmenu::loadevents.
363: '" onUnload="'.&Apache::lonmenu::unloadevents.'">'.
364: &Apache::lonmenu::menubuttons(undef,$target,1)
365: );
366: $r->print(&mt('This page is either empty or it only contains resources that are currently hidden').'. ');
367: $r->print('<br /><br />'.&mt('Please use the LON-CAPA navigation arrows to move to another item in the course').'.</body></html>');
368: } else {
369: # ------------------------------------------------------------------ Build page
370:
371: # ---------------------------------------------------------------- Send headers
372: unless ($target eq 'tex') {
373: if ($isxml) {
374: &Apache::loncommon::content_type($r,'text/xml');
375: $r->send_http_header;
376: $r->print($xmlheader);
377: } else {
378: &Apache::loncommon::content_type($r,'text/html');
379: $r->send_http_header;
380: $r->print('<html>');
381: }
382: # ------------------------------------------------------------------------ Head
383: $r->print("\n<head>\n".$allmeta);
384: if ($allscript) {
385: $r->print("\n<script language='JavaScript'>\n".
386: $allscript."\n</script>\n");
387: }
388: $r->print(&Apache::lonmenu::registerurl(1,undef));
389: $r->print("\n</head>\n");
390: # ------------------------------------------------------------------ Start body
391: if ($isxml) {
392: $r->print($xmlbody);
393: } else {
394: $r->print(
395: '<body bgcolor="#FFFFFF" onLoad="'.&Apache::lonmenu::loadevents.
396: '" onUnload="'.&Apache::lonmenu::unloadevents.'">'.
397: &Apache::lonmenu::menubuttons(undef,$target,1)
398: );
399: }
400: # ------------------------------------------------------------------ Start form
401: if ($nforms) {
402: $r->print('<form method="post" action="'.
403: &Apache::lonenc::check_encrypt($requrl)
404: .'">');
405: }
406: } elsif ($target eq 'tex') {
407: $r->print('\documentclass{article}
408: \newcommand{\keephidden}[1]{}
409: \usepackage[dvips]{graphicx}
410: \usepackage{epsfig}
411: \usepackage{calc}
412: \usepackage{longtable}
413: \begin{document}');
414: }
415: # ----------------------------------------------------------------- Start table
416: if ($target eq 'tex') {
417: $r->print('\begin{longtable}INSERTTHEHEADOFLONGTABLE\endfirsthead\endhead ');
418: if ($number_of_columns le $lcm) {$number_of_columns=$lcm;};
419: } else {
420: $r->print('<table width="100%" cols="'.$lcm.'" border="0">');
421: }
422: for ($i=0;$i<=$#rows;$i++) {
423: if ($rows[$i]) {
424: unless ($target eq 'tex') {
425: $r->print("\n<tr>");
426: }
427: my @colcont=split(/\&/,$rows[$i]);
428: my $avespan=$lcm/($#colcont+1);
429: for ($j=0;$j<=$#colcont;$j++) {
430: my $rid=$colcont[$j];
431: my $metainfo = '';
432: my $esrc=&Apache::lonnet::declutter($hash{'src_'.$rid});
433: if ($hash{'encrypted_'.$rid}) {
434: $esrc=&Apache::lonenc::encrypted($esrc);
435: }
436: unless ($hash{'src_'.$rid} =~ m-^/uploaded/-) {
437: $metainfo ='<a name="'.&Apache::lonnet::escape($esrc).'" />'.
438: '<a href="'.$metalink{$rid}.'" target="LONcatInfo">'.
439: '<img src="/adm/lonMisc/cat_button.gif" border=0>'.
440: '</img></a>';
441: }
442: $metainfo .= '<a href="/adm/evaluate?postdata='.
443: &Apache::lonnet::escape($esrc).
444: '" target="LONcatInfo">'.
445: '<img src="/adm/lonMisc/eval_button.gif" border=0>'.
446: '</img></a>';
447: if (
448: ($hash{'src_'.$rid}=~/\.(problem|exam|quiz|assess|survey|form)$/) &&
449: (&Apache::lonnet::allowed('mgr',$ENV{'request.course.id'})) &&
450: ($hash{'src_'.$rid} !~ m-^/uploaded/-)) {
451: my ($mapid,$resid)=split(/\./,$rid);
452: my $symb=
453: &Apache::lonnet::declutter($hash{'map_id_'.$mapid}).
454: '___'.$resid.'___'.
455: &Apache::lonnet::declutter($hash{'src_'.$rid});
456: $metainfo.=
457: '<a href="/adm/grades?symb='.&Apache::lonnet::escape($symb).
458: # '&command=submission" target="LONcatInfo">'.
459: '&command=submission">'.
460: '<img src="/adm/lonMisc/subm_button.gif" border=0>'.
461: '</img></a>'.
462: '<a href="/adm/grades?symb='.&Apache::lonnet::escape($symb).
463: # '&command=gradingmenu" target="LONcatInfo">'.
464: '&command=gradingmenu">'.
465: '<img src="/adm/lonMisc/pgrd_button.gif" border=0>'.
466: '</img></a>'.
467: '<a href="/adm/parmset?symb='.&Apache::lonnet::escape($symb).
468: # '" target="LONcatInfo">'.
469: '" >'.
470: '<img src="/adm/lonMisc/pprm_button.gif" border=0>'.
471: '</img></a>';
472: }
473: $metainfo.='<br></br>';
474: unless ($target eq 'tex') {
475: $r->print('<td colspan="'.$avespan.'"');
476: }
477: if ($cellemb{$rid} eq 'ssi') {
478: unless ($target eq 'tex') {
479: if ($ssibgcolor{$rid}) {
480: $r->print(' bgcolor="'.
481: $ssibgcolor{$rid}.'"');
482: }
483: $r->print('>'.$metainfo.'<font');
484:
485: if ($ssitext{$rid}) {
486: $r->print(' text="'.$ssitext{$rid}.'"');
487: }
488: if ($ssilink{$rid}) {
489: $r->print(' link="'.$ssilink{$rid}.'"');
490: }
491: if ($ssitext{$rid}) {
492: $r->print(' vlink="'.$ssivlink{$rid}.'"');
493: }
494: if ($ssialink{$rid}) {
495: $r->print(' alink="'.$ssialink{$rid}.'"');
496: }
497: $r->print('>');
498: }
499: $r->print($ssibody{$rid});
500: unless ($target eq 'tex') {
501: $r->print('</font>');
502: }
503: if ($ENV{'course.'.
504: $ENV{'request.course.id'}.
505: '.pageseparators'} eq 'yes') {
506: unless($target eq 'tex') {
507: $r->print('<hr />');
508: } else {
509: $r->print('\hline');
510: }
511: }
512: } elsif ($cellemb{$rid} eq 'img') {
513: $r->print('>'.$metainfo.'<img src="'.
514: $hash{'src_'.$rid}.'"></img>');
515: } elsif ($cellemb{$rid} eq 'emb') {
516: $r->print('>'.$metainfo.'<embed src="'.
517: $hash{'src_'.$rid}.'"></embed>');
518: } elsif (&Apache::lonnet::declutter($hash{'src_'.$rid}) !~/\.(sequence|page)$/) {
519: $r->print($metainfo.'<b>'.$hash{'title_'.$rid}.'</b><br />'.
520: &mt('It is recommended that you use an up-to-date virus scanner before handling this file.').'</p><p><table>'.
521: &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 />');
522: }
523: unless ($target eq 'tex') {
524: $r->print('</td>');
525: } else {
526: for (my $incol=1;$incol<=$avespan;$incol++) {
527: $r->print(' & ');
528: }
529: }
530: }
531: unless ($target eq 'tex') {
532: $r->print('</tr>');
533: } else {
534: $r->print('REMOVETHEHEADOFLONGTABLE\\\\');
535: }
536: }
537: }
538: unless ($target eq 'tex') {
539: $r->print("\n</table>");
540: } else {
541: $r->print('\end{longtable}\strut');
542: }
543: # ---------------------------------------------------------------- Submit, etc.
544: if ($nforms) {
545: $r->print(
546: '<input name="all_submit" value="Submit All" type="'.
547: (($nforms>1)?'submit':'hidden').'"></input></form>');
548: }
549: unless ($target eq 'tex') {
550: $r->print('</body>'.&Apache::lonxml::xmlend());
551: } else {
552: $r->print('\end{document}'.$number_of_columns);
553: }
554: # -------------------------------------------------------------------- End page
555: }
556: # ------------------------------------------------------------- End render page
557: } else {
558: $r->content_type('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: $r->content_type('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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