Annotation of rat/lonpage.pm, revision 1.45
1.1 www 1: # The LearningOnline Network with CAPA
2: # Page Handler
3: #
1.45 ! www 4: # $Id: lonpage.pm,v 1.44 2002/08/12 18:21:42 albertel Exp $
1.29 www 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: #
1.1 www 28: # (TeX Content Handler
29: #
1.30 harris41 30: # YEAR=2000
1.1 www 31: # 05/29/00,05/30 Gerd Kortemeyer)
1.10 www 32: # 08/30,08/31,09/06,09/14,09/15,09/16,09/19,09/20,09/21,09/23,
1.24 www 33: # 10/02,10/10,10/14,10/16,10/18,10/19,10/31,11/6,11/14,11/16,
1.30 harris41 34: # YEAR=2001
1.27 www 35: # 08/13/01,08/30,10/1 Gerd Kortemeyer
1.30 harris41 36: # 12/16 Scott Harrison
1.33 www 37: # YEAR=2002
38: # 03/19 Gerd Kortemeyer
1.30 harris41 39: #
40: ###
1.1 www 41:
42: package Apache::lonpage;
43:
44: use strict;
45: use Apache::Constants qw(:common :http);
46: use Apache::lonnet();
1.30 harris41 47: use Apache::loncommon();
1.21 www 48: use Apache::lonxml();
1.6 www 49: use HTML::TokeParser;
1.1 www 50: use GDBM_File;
1.39 www 51: use Apache::lonsequence;
1.1 www 52:
1.2 www 53: # -------------------------------------------------------------- Module Globals
54: my %hash;
55: my @rows;
1.6 www 56:
57: # ------------------------------------------------------------------ Euclid gcd
58:
59: sub euclid {
60: my ($e,$f)=@_;
61: my $a; my $b; my $r;
62: if ($e>$f) { $b=$e; $r=$f; } else { $r=$e; $b=$f; }
63: while ($r!=0) {
64: $a=$b; $b=$r;
65: $r=$a%$b;
66: }
67: return $b;
68: }
1.2 www 69:
70: # ------------------------------------------------------------ Build page table
71:
72: sub tracetable {
73: my ($sofar,$rid,$beenhere)=@_;
74: my $further=$sofar;
75: unless ($beenhere=~/\&$rid\&/) {
76: $beenhere.=$rid.'&';
77:
78: if (defined($hash{'is_map_'.$rid})) {
79: if ((defined($hash{'map_start_'.$hash{'src_'.$rid}})) &&
80: (defined($hash{'map_finish_'.$hash{'src_'.$rid}}))) {
1.4 www 81: my $frid=$hash{'map_finish_'.$hash{'src_'.$rid}};
82: $sofar=
1.2 www 83: &tracetable($sofar,$hash{'map_start_'.$hash{'src_'.$rid}},
1.3 www 84: '&'.$frid.'&');
1.4 www 85: $sofar++;
86: if ($hash{'src_'.$frid}) {
1.3 www 87: my $brepriv=&Apache::lonnet::allowed('bre',$hash{'src_'.$frid});
88: if (($brepriv eq '2') || ($brepriv eq 'F')) {
89: if (defined($rows[$sofar])) {
90: $rows[$sofar].='&'.$frid;
91: } else {
92: $rows[$sofar]=$frid;
93: }
94: }
1.4 www 95: }
1.2 www 96: }
97: } else {
1.4 www 98: $sofar++;
99: if ($hash{'src_'.$rid}) {
1.3 www 100: my $brepriv=&Apache::lonnet::allowed('bre',$hash{'src_'.$rid});
101: if (($brepriv eq '2') || ($brepriv eq 'F')) {
102: if (defined($rows[$sofar])) {
1.2 www 103: $rows[$sofar].='&'.$rid;
1.3 www 104: } else {
1.2 www 105: $rows[$sofar]=$rid;
1.3 www 106: }
107: }
1.4 www 108: }
1.2 www 109: }
110:
111: if (defined($hash{'to_'.$rid})) {
1.11 www 112: my $mincond=1;
113: my $next='';
1.30 harris41 114: foreach (split(/\,/,$hash{'to_'.$rid})) {
1.11 www 115: my $thiscond=
116: &Apache::lonnet::directcondval($hash{'condid_'.$hash{'undercond_'.$_}});
117: if ($thiscond>=$mincond) {
118: if ($next) {
119: $next.=','.$_.':'.$thiscond;
120: } else {
121: $next=$_.':'.$thiscond;
122: }
123: if ($thiscond>$mincond) { $mincond=$thiscond; }
124: }
1.30 harris41 125: }
126: foreach (split(/\,/,$next)) {
1.11 www 127: my ($linkid,$condval)=split(/\:/,$_);
128: if ($condval>=$mincond) {
129: my $now=&tracetable($sofar,$hash{'goesto_'.$linkid},$beenhere);
130: if ($now>$further) { $further=$now; }
131: }
1.30 harris41 132: }
1.11 www 133:
1.2 www 134: }
135: }
136: return $further;
137: }
138:
1.1 www 139: # ================================================================ Main Handler
140:
141: sub handler {
142: my $r=shift;
143:
1.3 www 144: # ------------------------------------------- Set document type for header only
1.1 www 145:
1.3 www 146: if ($r->header_only) {
147: if ($ENV{'browser.mathml'}) {
148: $r->content_type('text/xml');
149: } else {
1.40 sakharuk 150: $r->content_type('text/html');
1.3 www 151: }
152: $r->send_http_header;
153: return OK;
154: }
1.43 sakharuk 155:
1.39 www 156: &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},
157: ['forceselect','launch']);
1.43 sakharuk 158: my $number_of_columns = 1;
1.37 sakharuk 159: my $requrl=$r->uri;
160: my $target = $ENV{'form.grade_target'};
1.1 www 161: # ----------------------------------------------------------------- Tie db file
1.39 www 162: if (($ENV{'request.course.fn'}) && (!$ENV{'form.forceselect'})) {
1.1 www 163: my $fn=$ENV{'request.course.fn'};
164: if (-e "$fn.db") {
1.44 albertel 165: if (tie(%hash,'GDBM_File',"$fn.db",&GDBM_READER(),0640)) {
1.1 www 166: # ------------------------------------------------------------------- Hash tied
167: my $firstres=$hash{'map_start_'.$requrl};
168: my $lastres=$hash{'map_finish_'.$requrl};
169: if (($firstres) && ($lastres)) {
170: # ----------------------------------------------------------------- Render page
171:
1.3 www 172: @rows=();
1.2 www 173:
1.45 ! www 174: &tracetable(0,$firstres,'&');
1.2 www 175:
1.9 www 176: # ------------------------------------------------------------ Add to symb list
177:
1.2 www 178: my $i;
1.9 www 179: my %symbhash=();
180: for ($i=0;$i<=$#rows;$i++) {
181: if ($rows[$i]) {
182: my @colcont=split(/\&/,$rows[$i]);
1.30 harris41 183: foreach (@colcont) {
1.9 www 184: $symbhash{$hash{'src_'.$_}}='';
1.30 harris41 185: }
1.9 www 186: }
187: }
188: &Apache::lonnet::symblist($requrl,%symbhash);
189:
190: # ------------------------------------------------------------------ Page parms
191:
1.4 www 192: my $j;
1.6 www 193: my $lcm=1;
194: my $contents=0;
1.7 www 195: my $nforms=0;
1.6 www 196:
197: my %ssibody=();
198: my %ssibgcolor=();
199: my %ssitext=();
200: my %ssilink=();
201: my %ssivlink=();
202: my %ssialink=();
1.14 www 203:
204: my %metalink=();
205:
1.6 www 206: my %cellemb=();
1.3 www 207:
1.7 www 208: my $allscript='';
209: my $allmeta='';
210:
211: my $isxml=0;
212: my $xmlheader='';
213: my $xmlbody='';
214:
1.3 www 215: # --------------------------------------------- Get SSI output, post parameters
216:
1.2 www 217: for ($i=0;$i<=$#rows;$i++) {
1.4 www 218: if ($rows[$i]) {
1.6 www 219: $contents++;
1.3 www 220: my @colcont=split(/\&/,$rows[$i]);
1.6 www 221: $lcm*=($#colcont+1)/euclid($lcm,($#colcont+1));
1.30 harris41 222: foreach (@colcont) {
1.3 www 223: my $src=$hash{'src_'.$_};
1.5 www 224: $src=~/\.(\w+)$/;
1.14 www 225: $metalink{$_}=$src.'.meta';
1.30 harris41 226: $cellemb{$_}=Apache::loncommon::fileembstyle($1);
1.3 www 227: if ($cellemb{$_} eq 'ssi') {
228: # --------------------------------------------------------- This is an SSI cell
1.5 www 229: my $prefix=$_.'_';
230: my %posthash=('request.prefix' => $prefix);
1.8 www 231: if (($ENV{'form.'.$prefix.'submit'})
1.7 www 232: || ($ENV{'form.all_submit'})) {
1.30 harris41 233: foreach (keys %ENV) {
1.5 www 234: if ($_=~/^form.$prefix/) {
235: my $name=$_;
236: $name=~s/^form.$prefix//;
237: $posthash{$name}=$ENV{$_};
238: }
1.30 harris41 239: }
1.7 www 240: }
1.5 www 241: my $output=Apache::lonnet::ssi($src,%posthash);
1.6 www 242: my $parser=HTML::TokeParser->new(\$output);
243: my $token;
1.12 www 244: my $thisdir=$src;
1.6 www 245: my $bodydef=0;
1.7 www 246: my $thisxml=0;
1.12 www 247: my @rlinks=();
1.7 www 248: if ($output=~/\?xml/) {
249: $isxml=1;
250: $thisxml=1;
251: $output=~
252: /((?:\<(?:\?xml|\!DOC|html)[^\>]*(?:\>|\>\]\>)\s*)+)\<body[^\>]*\>/si;
253: $xmlheader=$1;
254: }
1.12 www 255: while ($token=$parser->get_token) {
256: if ($token->[0] eq 'S') {
257: if ($token->[1] eq 'a') {
258: if ($token->[2]->{'href'}) {
259: $rlinks[$#rlinks+1]=
260: $token->[2]->{'href'};
261: }
262: } elsif ($token->[1] eq 'img') {
263: $rlinks[$#rlinks+1]=
264: $token->[2]->{'src'};
265: } elsif ($token->[1] eq 'embed') {
266: $rlinks[$#rlinks+1]=
267: $token->[2]->{'src'};
268: } elsif ($token->[1] eq 'base') {
269: $thisdir=$token->[2]->{'href'};
270: } elsif ($token->[1] eq 'body') {
1.7 www 271: $bodydef=1;
272: $ssibgcolor{$_}=$token->[2]->{'bgcolor'};
273: $ssitext{$_}=$token->[2]->{'text'};
274: $ssilink{$_}=$token->[2]->{'link'};
275: $ssivlink{$_}=$token->[2]->{'vlink'};
276: $ssialink{$_}=$token->[2]->{'alink'};
277: if ($thisxml) {
278: $xmlbody=$token->[4];
279: }
1.12 www 280: } elsif ($token->[1] eq 'meta') {
1.28 albertel 281: if ($token->[4] !~ m:/>$:) {
1.7 www 282: $allmeta.="\n".$token->[4].'</meta>';
1.28 albertel 283: } else {
284: $allmeta.="\n".$token->[4];
285: }
1.12 www 286: } elsif (($token->[1] eq 'script') &&
287: ($bodydef==0)) {
1.7 www 288: $allscript.="\n\n"
289: .$parser->get_text('/script');
1.6 www 290: }
1.12 www 291: }
292: }
1.6 www 293: if ($output=~/\<body[^\>]*\>(.*)/si) {
294: $output=$1;
295: }
296: $output=~s/\<\/body\>.*//si;
1.7 www 297: if ($output=~/\<form/si) {
298: $nforms++;
299: $output=~s/\<form[^\>]*\>//gsi;
300: $output=~s/\<\/form[^\>]*\>//gsi;
1.17 www 301: $output=~
1.18 www 302: s/\<((?:input|select|button|textarea)[^\>]+)name\s*\=\s*[\'\"]*([\w\.\:]+)[\'\"]*([^\>]*)\>/\<$1 name="$prefix$2" $3\>/gsi;
1.7 www 303: }
1.12 www 304: $thisdir=~s/\/[^\/]*$//;
1.30 harris41 305: foreach (@rlinks) {
1.12 www 306: unless (($_=~/^http:\/\//i) ||
1.31 albertel 307: ($_=~/^\//) ||
308: ($_=~/^javascript:/i) ||
309: ($_=~/^mailto:/i) ||
310: ($_=~/^\#/)) {
1.12 www 311: my $newlocation=
312: &Apache::lonnet::hreflocation($thisdir,$_);
313: $output=~s/(\"|\'|\=\s*)$_(\"|\'|\s|\>)/$1$newlocation$2/;
314: }
1.30 harris41 315: }
1.24 www 316: # -------------------------------------------------- Deal with Applet codebases
317: $output=~s/(\<applet[^\>]+)(codebase\=[^\S\>]+)*([^\>]*)\>/$1.($2?$2:' codebase="'.$thisdir.'"').$3.'>'/gei;
1.5 www 318: $ssibody{$_}=$output;
1.3 www 319: # ---------------------------------------------------------------- End SSI cell
320: }
1.30 harris41 321: }
1.4 www 322: }
1.2 www 323: }
1.6 www 324: unless ($contents) {
1.3 www 325: $r->content_type('text/html');
326: $r->send_http_header;
327: $r->print('<html><body>Empty page.</body></html>');
328: } else {
329: # ------------------------------------------------------------------ Build page
1.7 www 330:
331: # ---------------------------------------------------------------- Send headers
1.37 sakharuk 332: unless ($target eq 'tex') {
333: if ($isxml) {
334: $r->content_type('text/xml');
335: $r->send_http_header;
336: $r->print($xmlheader);
337: } else {
338: $r->content_type('text/html');
339: $r->send_http_header;
340: $r->print('<html>');
341: }
1.7 www 342: # ------------------------------------------------------------------------ Head
1.37 sakharuk 343: $r->print("\n<head>\n".$allmeta);
344: $allscript=~
345: s/\/\/ BEGIN LON\-CAPA Internal.+\/\/ END LON\-CAPA Internal\s//gs;
346: if ($allscript) {
347: $r->print("\n<script language='JavaScript'>\n".
348: $allscript."\n</script>\n");
349: }
350: $r->print(&Apache::lonxml::registerurl(1,undef));
351: $r->print("\n</head>\n");
1.7 www 352: # ------------------------------------------------------------------ Start body
1.37 sakharuk 353: if ($isxml) {
354: $r->print($xmlbody);
355: } else {
356: $r->print('<body bgcolor="#FFFFFF" onLoad="'.&Apache::lonxml::loadevents.'" onUnload="'.&Apache::lonxml::unloadevents.'">');
357: }
1.7 www 358: # ------------------------------------------------------------------ Start form
1.37 sakharuk 359: if ($nforms) {
360: $r->print('<form method="post" action="'.
361: $requrl.'">');
1.40 sakharuk 362: }
363: } else {
364: $r->print('\documentclass[letterpaper]{article}
365: \newcommand{\keephidden}[1]{}
366: \usepackage[dvips]{graphicx}
367: \usepackage{epsfig}
368: \usepackage{calc}
1.42 sakharuk 369: \usepackage{longtable}
1.40 sakharuk 370: \begin{document}');
371: }
1.7 www 372: # ----------------------------------------------------------------- Start table
1.40 sakharuk 373: if ($target eq 'tex') {
1.42 sakharuk 374: $r->print('\begin{longtable}INSERTTHEHEADOFLONGTABLE\endfirsthead\endhead ');
1.43 sakharuk 375: if ($number_of_columns le $lcm) {$number_of_columns=$lcm;};
1.40 sakharuk 376: } else {
1.37 sakharuk 377: $r->print('<table cols="'.$lcm.'" border="0">');
378: }
1.5 www 379: for ($i=0;$i<=$#rows;$i++) {
380: if ($rows[$i]) {
1.37 sakharuk 381: unless ($target eq 'tex') {
382: $r->print("\n<tr>");
383: }
1.4 www 384: my @colcont=split(/\&/,$rows[$i]);
1.6 www 385: my $avespan=$lcm/($#colcont+1);
386: for ($j=0;$j<=$#colcont;$j++) {
387: my $rid=$colcont[$j];
1.23 www 388: my $metainfo='<a href="'.
389: $metalink{$rid}.'" target="LONcatInfo">'.
390: '<img src="/adm/lonMisc/cat_button.gif" border=0>'.
1.34 www 391: '</img></a><a href="/adm/evaluate?postdata='.
1.35 www 392: &Apache::lonnet::escape(&Apache::lonnet::declutter($hash{'src_'.$rid}))
393: .'" target="LONcatInfo">'.
1.33 www 394: '<img src="/adm/lonMisc/eval_button.gif" border=0>'.
395: '</img></a>';
1.27 www 396: if (
397: ($hash{'src_'.$rid}=~/\.(problem|exam|quiz|assess|survey|form)$/) &&
398: (&Apache::lonnet::allowed('mgr',$ENV{'request.course.id'}))) {
399: my ($mapid,$resid)=split(/\./,$rid);
400: my $symb=
401: &Apache::lonnet::declutter($hash{'map_id_'.$mapid}).
402: '___'.$resid.'___'.
403: &Apache::lonnet::declutter($hash{'src_'.$rid});
404: $metainfo.=
1.36 www 405: '<a href="/adm/grades?symb='.&Apache::lonnet::escape($symb).
1.27 www 406: '&command=submission" target="LONcatInfo">'.
407: '<img src="/adm/lonMisc/subm_button.gif" border=0>'.
408: '</img></a>'.
1.36 www 409: '<a href="/adm/grades?symb='.&Apache::lonnet::escape($symb).
1.38 albertel 410: '&command=gradingmenu" target="LONcatInfo">'.
1.27 www 411: '<img src="/adm/lonMisc/pgrd_button.gif" border=0>'.
412: '</img></a>'.
1.36 www 413: '<a href="/adm/parmset?symb='.&Apache::lonnet::escape($symb).
414: '" target="LONcatInfo">'.
1.27 www 415: '<img src="/adm/lonMisc/pprm_button.gif" border=0>'.
416: '</img></a>';
417: }
418: $metainfo.='<br></br>';
1.37 sakharuk 419: unless ($target eq 'tex') {
420: $r->print('<td colspan="'.$avespan.'"');
421: }
1.6 www 422: if ($cellemb{$rid} eq 'ssi') {
1.37 sakharuk 423: unless ($target eq 'tex') {
424: if ($ssibgcolor{$rid}) {
425: $r->print(' bgcolor="'.
426: $ssibgcolor{$rid}.'"');
427: }
428: $r->print('>'.$metainfo.'<font');
429:
430: if ($ssitext{$rid}) {
431: $r->print(' text="'.$ssitext{$rid}.'"');
432: }
433: if ($ssilink{$rid}) {
434: $r->print(' link="'.$ssilink{$rid}.'"');
435: }
436: if ($ssitext{$rid}) {
437: $r->print(' vlink="'.$ssivlink{$rid}.'"');
438: }
439: if ($ssialink{$rid}) {
440: $r->print(' alink="'.$ssialink{$rid}.'"');
441: }
442: $r->print('>');
443: }
444: $r->print($ssibody{$rid});
445: unless ($target eq 'tex') {
446: $r->print('</font>');
1.41 www 447: }
448: if ($ENV{'course.'.
449: $ENV{'request.course.id'}.
450: '.pageseparators'} eq 'yes') {
451: unless($target eq 'tex') {
452: $r->print('<hr />');
453: } else {
454: $r->print('\hline');
455: }
1.37 sakharuk 456: }
457: } elsif ($cellemb{$rid} eq 'img') {
1.14 www 458: $r->print('>'.$metainfo.'<img src="'.
1.7 www 459: $hash{'src_'.$rid}.'"></img>');
1.13 www 460: } elsif ($cellemb{$rid} eq 'emb') {
1.14 www 461: $r->print('>'.$metainfo.'<embed src="'.
1.13 www 462: $hash{'src_'.$rid}.'"></embed>');
463: }
1.37 sakharuk 464: unless ($target eq 'tex') {
465: $r->print('</td>');
1.40 sakharuk 466: } else {
1.43 sakharuk 467: for (my $incol=1;$incol<=$avespan;$incol++) {
468: $r->print(' & ');
469: }
1.37 sakharuk 470: }
1.4 www 471: }
1.37 sakharuk 472: unless ($target eq 'tex') {
473: $r->print('</tr>');
1.40 sakharuk 474: } else {
1.42 sakharuk 475: $r->print('REMOVETHEHEADOFLONGTABLE\\\\');
1.37 sakharuk 476: }
1.5 www 477: }
1.4 www 478: }
1.37 sakharuk 479: unless ($target eq 'tex') {
480: $r->print("\n</table>");
1.40 sakharuk 481: } else {
1.42 sakharuk 482: $r->print('\end{longtable}');
1.37 sakharuk 483: }
1.7 www 484: # ---------------------------------------------------------------- Submit, etc.
485: if ($nforms) {
486: $r->print(
487: '<input name="all_submit" value="Submit All" type="'.
488: (($nforms>1)?'submit':'hidden').'"></input></form>');
489: }
1.40 sakharuk 490: unless ($target eq 'tex') {
491: $r->print('</body>'.&Apache::lonxml::xmlend());
492: } else {
493: $r->print('\end{document}'.$number_of_columns);
494: }
1.3 www 495: # -------------------------------------------------------------------- End page
496: }
1.1 www 497: # ------------------------------------------------------------- End render page
498: } else {
1.3 www 499: $r->content_type('text/html');
500: $r->send_http_header;
1.39 www 501: &Apache::lonsequence::viewmap($r,$requrl);
1.1 www 502: }
503: # ------------------------------------------------------------------ Untie hash
504: unless (untie(%hash)) {
505: &Apache::lonnet::logthis("<font color=blue>WARNING: ".
506: "Could not untie coursemap $fn (browse).</font>");
507: }
508: # -------------------------------------------------------------------- All done
509: return OK;
510: # ----------------------------------------------- Errors, hash could no be tied
511: }
512: }
513: }
1.39 www 514: $r->content_type('text/html');
515: $r->send_http_header;
516: &Apache::lonsequence::viewmap($r,$requrl);
517: return OK;
1.1 www 518: }
519:
520: 1;
521: __END__
522:
1.30 harris41 523: =head1 NAME
524:
525: Apache::lonpage - Page Handler
526:
527: =head1 SYNOPSIS
528:
529: Invoked by /etc/httpd/conf/srm.conf:
530:
531: <LocationMatch "^/res/.*\.page$>
532: SetHandler perl-script
533: PerlHandler Apache::lonpage
534: </LocationMatch>
535:
536: =head1 INTRODUCTION
537:
538: This module renders a .page resource.
539:
540: This is part of the LearningOnline Network with CAPA project
541: described at http://www.lon-capa.org.
542:
543: =head1 HANDLER SUBROUTINE
544:
545: This routine is called by Apache and mod_perl.
546:
547: =over 4
548:
549: =item *
550:
551: set document type for header only
552:
553: =item *
554:
555: tie db file
556:
557: =item *
558:
559: render page
560:
561: =item *
562:
563: add to symb list
564:
565: =item *
566:
567: page parms
568:
569: =item *
570:
571: Get SSI output, post parameters
572:
573: =item *
574:
575: SSI cell rendering
576:
577: =item *
578:
579: Deal with Applet codebases
580:
581: =item *
582:
583: Build page
584:
585: =item *
586:
587: send headers
588:
589: =item *
590:
591: start body
592:
593: =item *
594:
595: start form
596:
597: =item *
598:
599: start table
600:
601: =item *
602:
603: submit element, etc, render page, untie hash
604:
605: =back
606:
607: =head1 OTHER SUBROUTINES
608:
609: =over 4
610:
611: =item *
612:
613: euclid() : Euclid's method for determining the greatest common denominator.
614:
615: =item *
616:
617: tracetable() : Build page table.
1.1 www 618:
1.30 harris41 619: =back
1.1 www 620:
1.30 harris41 621: =cut
1.1 www 622:
623:
624:
625:
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