1: # The LearningOnline Network with CAPA
2: # Construct and maintain state and binary representation of course for user
3: #
4: # $Id: lonuserstate.pm,v 1.52 2003/02/28 16:17:00 www 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: # (Server for RAT Maps
29: #
30: # (Edit Handler for RAT Maps
31: # (TeX Content Handler
32: #
33: # YEAR=2000
34: # 05/29/00,05/30 Gerd Kortemeyer)
35: # 7/1 Gerd Kortemeyer)
36: # 7/1,7/3,7/4,7/7,7/8,7/10 Gerd Kortemeyer)
37: #
38: # 7/15,7/17,7/18,8/1,8/2,8/4,8/5,8/21,8/22,8/23,8/30,
39: # 9/2,9/4,9/29,9/30,10/2,10/11,10/30,10/31,
40: # 11/1,11/2,11/14,11/16,11/22,12/28,
41: # YEAR=2001
42: # 07/05/01,08/30,08/31 Gerd Kortemeyer
43: #
44: ###
45:
46: package Apache::lonuserstate;
47:
48: # ------------------------------------------------- modules used by this module
49: use strict;
50: use Apache::Constants qw(:common :http);
51: use Apache::File;
52: use HTML::TokeParser;
53: use Apache::lonnet();
54: use Apache::loncommon();
55: use GDBM_File;
56: use Apache::lonmsg;
57: use Safe;
58: use Safe::Hole;
59: use Opcode;
60:
61: # ---------------------------------------------------- Globals for this package
62:
63: my $pc; # Package counter
64: my %hash; # The big tied hash
65: my %parmhash;# The hash with the parameters
66: my @cond; # Array with all of the conditions
67: my $errtext; # variable with all errors
68: my $retfurl; # variable with the very first URL in the course
69: my %randompick; # randomly picked resources
70: my %randompickseed; # optional seed for randomly picking resources
71: my %actualversion; # version of resource as loaded now
72: my %setversion; # forced version of resource
73: my %lastversion; # version when CC came in last
74: my $versionmode; # how versioning is handled in this course
75:
76: # --------------------------------------------------------- Loads map from disk
77:
78: sub loadmap {
79: my $uri=shift;
80: if ($hash{'map_pc_'.$uri}) { return OK; }
81:
82: $pc++;
83: my $lpc=$pc;
84: $hash{'map_pc_'.$uri}=$lpc;
85: $hash{'map_id_'.$lpc}=$uri;
86:
87: # Determine and check filename
88: my $fn=&Apache::lonnet::filelocation('',$uri);
89:
90: my $ispage=($fn=~/\.page$/);
91:
92: unless (($fn=~/\.sequence$/) ||
93: ($fn=~/\.page$/)) {
94: $errtext.="Invalid map: $fn\n";
95: return OK;
96: }
97:
98: my $instr=&Apache::lonnet::getfile($fn);
99:
100: unless ($instr == -1) {
101:
102: # Successfully got file, parse it
103:
104: my $parser = HTML::TokeParser->new(\$instr);
105: my $token;
106:
107: my $linkpc=0;
108:
109: $fn=~/\.(\w+)$/;
110:
111: $hash{'map_type_'.$lpc}=$1;
112:
113: while ($token = $parser->get_token) {
114: if ($token->[0] eq 'S') {
115: if ($token->[1] eq 'resource') {
116: # -------------------------------------------------------------------- Resource
117:
118: my $rid=$lpc.'.'.$token->[2]->{'id'};
119:
120: $hash{'kind_'.$rid}='res';
121: $hash{'title_'.$rid}=$token->[2]->{'title'};
122: my $turi=$token->[2]->{'src'};
123: $Apache::lonnet::titlecache{
124: &Apache::lonnet::symbclean(
125: &Apache::lonnet::declutter($uri).'___'.
126: $token->[2]->{'id'}.'___'.
127: &Apache::lonnet::declutter($turi))}=
128: $token->[2]->{'title'};
129: unless ($ispage) {
130: $turi=~/\.(\w+)$/;
131: my $embstyle=&Apache::loncommon::fileembstyle($1);
132: if ($token->[2]->{'external'} eq 'true') { # external
133: $turi=~s/^http\:\/\//\/adm\/wrapper\/ext\//;
134: } elsif ($turi=~/^\/*uploaded\//) { # uploaded
135: if (($embstyle eq 'img') || ($embstyle eq 'emb')
136: || ($embstyle eq 'ssi')) {
137: $turi='/adm/wrapper'.$turi;
138: } elsif ($turi!~/\.(sequence|page)$/) {
139: $turi='/adm/coursedocs/showdoc'.$turi;
140: }
141: } else { # normal internal resource
142: if (($embstyle eq 'img') || ($embstyle eq 'emb')
143: || ($turi=~/\/(syllabus|aboutme|navmaps|smppg|bulletinboard)$/)) {
144: $turi=$turi.'?register=1';
145: }
146: }
147: }
148: $hash{'src_'.$rid}=$turi;
149:
150: if (defined($hash{'ids_'.$turi})) {
151: $hash{'ids_'.$turi}.=','.$rid;
152: } else {
153: $hash{'ids_'.$turi}=''.$rid;
154: }
155:
156: if ($token->[2]->{'external'} eq 'true') {
157: $hash{'ext_'.$rid}='true:';
158: } else {
159: $hash{'ext_'.$rid}='false:';
160: }
161: if ($token->[2]->{'type'}) {
162: $hash{'type_'.$rid}=$token->[2]->{'type'};
163: if ($token->[2]->{'type'} eq 'start') {
164: $hash{'map_start_'.$uri}="$rid";
165: }
166: if ($token->[2]->{'type'} eq 'finish') {
167: $hash{'map_finish_'.$uri}="$rid";
168: }
169: } else {
170: $hash{'type_'.$rid}='normal';
171: }
172:
173: if (($turi=~/\.sequence$/) ||
174: ($turi=~/\.page$/)) {
175: $hash{'is_map_'.$rid}=1;
176: &loadmap($turi);
177: }
178:
179: } elsif ($token->[1] eq 'condition') {
180: # ------------------------------------------------------------------- Condition
181:
182: my $rid=$lpc.'.'.$token->[2]->{'id'};
183:
184: $hash{'kind_'.$rid}='cond';
185: $cond[$#cond+1]=$token->[2]->{'value'};
186: $hash{'condid_'.$rid}=$#cond;
187: if ($token->[2]->{'type'}) {
188: $cond[$#cond].=':'.$token->[2]->{'type'};
189: } else {
190: $cond[$#cond].=':normal';
191: }
192:
193: } elsif ($token->[1] eq 'link') {
194: # ----------------------------------------------------------------------- Links
195:
196: $linkpc++;
197: my $linkid=$lpc.'.'.$linkpc;
198:
199: my $goesto=$lpc.'.'.$token->[2]->{'to'};
200: my $comesfrom=$lpc.'.'.$token->[2]->{'from'};
201: my $undercond=0;
202:
203: if ($token->[2]->{'condition'}) {
204: $undercond=$lpc.'.'.$token->[2]->{'condition'};
205: }
206:
207: $hash{'goesto_'.$linkid}=$goesto;
208: $hash{'comesfrom_'.$linkid}=$comesfrom;
209: $hash{'undercond_'.$linkid}=$undercond;
210:
211: if (defined($hash{'to_'.$comesfrom})) {
212: $hash{'to_'.$comesfrom}.=','.$linkid;
213: } else {
214: $hash{'to_'.$comesfrom}=''.$linkid;
215: }
216: if (defined($hash{'from_'.$goesto})) {
217: $hash{'from_'.$goesto}.=','.$linkid;
218: } else {
219: $hash{'from_'.$goesto}=''.$linkid;
220: }
221: } elsif ($token->[1] eq 'param') {
222: # ------------------------------------------------------------------- Parameter
223:
224: my $referid=$lpc.'.'.$token->[2]->{'to'};
225: my $part=$token->[2]->{'part'};
226: unless ($part) { $part=0; }
227: my $newparam=
228: &Apache::lonnet::escape($token->[2]->{'type'}).':'.
229: &Apache::lonnet::escape($part.'.'.
230: $token->[2]->{'name'}).'='.
231: &Apache::lonnet::escape($token->[2]->{'value'});
232: if (defined($hash{'param_'.$referid})) {
233: $hash{'param_'.$referid}.='&'.$newparam;
234: } else {
235: $hash{'param_'.$referid}=''.$newparam;
236: }
237: if ($token->[2]->{'name'} eq 'parameter_mapalias') {
238: $hash{'mapalias_'.$token->[2]->{'value'}}=$referid;
239: }
240: if ($token->[2]->{'name'} eq 'parameter_randompick') {
241: $randompick{$referid}=$token->[2]->{'value'};
242: }
243: if ($token->[2]->{'name'} eq 'parameter_randompickseed') {
244: $randompick{$referid}=$token->[2]->{'value'};
245: }
246: }
247:
248: }
249: }
250:
251: } else {
252: $errtext.='Map not loaded: The file does not exist. ';
253: }
254: }
255:
256: # --------------------------------------------------------- Simplify expression
257:
258: sub simplify {
259: my $expression=shift;
260: # (8)=8
261: $expression=~s/\((\d+)\)/$1/g;
262: # 8&8=8
263: $expression=~s/(\D)(\d+)\&\2(\D)/$1$2$3/g;
264: # 8|8=8
265: $expression=~s/(\D)(\d+)\|\2(\D)/$1$2$3/g;
266: # (5&3)&4=5&3&4
267: $expression=~s/\((\d+)((?:\&\d+)+)\)\&(\d+\D)/$1$2\&$3/g;
268: # (((5&3)|(4&6)))=((5&3)|(4&6))
269: $expression=~
270: s/\((\(\(\d+(?:\&\d+)*\)(?:\|\(\d+(?:\&\d+)*\))+\))\)/$1/g;
271: # ((5&3)|(4&6))|(1&2)=(5&3)|(4&6)|(1&2)
272: $expression=~
273: s/\((\(\d+(?:\&\d+)*\))((?:\|\(\d+(?:\&\d+)*\))+)\)\|(\(\d+(?:\&\d+)*\))/\($1$2\|$3\)/g;
274: return $expression;
275: }
276:
277: # -------------------------------------------------------- Build condition hash
278:
279: sub traceroute {
280: my ($sofar,$rid,$beenhere)=@_;
281: $sofar=simplify($sofar);
282: unless ($beenhere=~/\&$rid\&/) {
283: $beenhere.=$rid.'&';
284: if (($retfurl eq '') && ($hash{'src_'.$rid})
285: && ($hash{'src_'.$rid}!~/\.sequence$/)) {
286: my ($mapid,$resid)=split(/\./,$rid);
287: $retfurl=$hash{'src_'.$rid}.
288: (($hash{'src_'.$rid}=~/\?/)?'&':'?').'symb='.
289: &Apache::lonnet::symbclean(
290: &Apache::lonnet::declutter($hash{'map_id_'.$mapid}).
291: '___'.$resid.'___'.
292: &Apache::lonnet::declutter($hash{'src_'.$rid}));
293: }
294: if (defined($hash{'conditions_'.$rid})) {
295: $hash{'conditions_'.$rid}=simplify(
296: '('.$hash{'conditions_'.$rid}.')|('.$sofar.')');
297: } else {
298: $hash{'conditions_'.$rid}=$sofar;
299: }
300: if (defined($hash{'is_map_'.$rid})) {
301: if (defined($hash{'map_start_'.$hash{'src_'.$rid}})) {
302: &traceroute($sofar,$hash{'map_start_'.$hash{'src_'.$rid}},'&');
303: if (defined($hash{'map_finish_'.$hash{'src_'.$rid}})) {
304: $sofar=
305: $hash{'conditions_'.$hash{'map_finish_'.$hash{'src_'.$rid}}};
306: }
307: }
308: }
309: if (defined($hash{'to_'.$rid})) {
310: foreach (split(/\,/,$hash{'to_'.$rid})) {
311: my $further=$sofar;
312: if ($hash{'undercond_'.$_}) {
313: if (defined($hash{'condid_'.$hash{'undercond_'.$_}})) {
314: $further=simplify('('.$further.')&('.
315: $hash{'condid_'.$hash{'undercond_'.$_}}.')');
316: } else {
317: $errtext.='Undefined condition ID: '
318: .$hash{'undercond_'.$_}.'. ';
319: }
320: }
321: &traceroute($further,$hash{'goesto_'.$_},$beenhere);
322: }
323: }
324: }
325: }
326:
327: # ------------------------------ Cascading conditions, quick access, parameters
328:
329: sub accinit {
330: my ($uri,$short,$fn)=@_;
331: my %acchash=();
332: my %captured=();
333: my $condcounter=0;
334: $acchash{'acc.cond.'.$short.'.0'}=0;
335: foreach (keys %hash) {
336: if ($_=~/^conditions/) {
337: my $expr=$hash{$_};
338: foreach ($expr=~m/(\(\(\d+(?:\&\d+)+\)(?:\|\(\d+(?:\&\d+)+\))+\))/g) {
339: my $sub=$_;
340: my $orig=$_;
341: $sub=~/\(\((\d+\&(:?\d+\&)*)(?:\d+\&*)+\)(?:\|\(\1(?:\d+\&*)+\))+\)/;
342: my $factor=$1;
343: $sub=~s/$factor//g;
344: $sub=~s/^\(/\($factor\(/;
345: $sub.=')';
346: $sub=simplify($sub);
347: $orig=~s/(\W)/\\$1/g;
348: $expr=~s/$orig/$sub/;
349: }
350: $hash{$_}=$expr;
351: unless (defined($captured{$expr})) {
352: $condcounter++;
353: $captured{$expr}=$condcounter;
354: $acchash{'acc.cond.'.$short.'.'.$condcounter}=$expr;
355: }
356: } elsif ($_=~/^param_(\d+)\.(\d+)/) {
357: my $prefix=&Apache::lonnet::declutter($hash{'map_id_'.$1}).
358: '___'.$2.'___'.&Apache::lonnet::declutter($hash{'src_'.$1.'.'.$2});
359: foreach (split(/\&/,$hash{$_})) {
360: my ($typename,$value)=split(/\=/,$_);
361: my ($type,$name)=split(/\:/,$typename);
362: $parmhash{$prefix.'.'.&Apache::lonnet::unescape($name)}=
363: &Apache::lonnet::unescape($value);
364: $parmhash{$prefix.'.'.&Apache::lonnet::unescape($name).'.type'}=
365: &Apache::lonnet::unescape($type);
366: }
367: }
368: }
369: foreach (keys %hash) {
370: if ($_=~/^ids/) {
371: foreach (split(/\,/,$hash{$_})) {
372: my $resid=$_;
373: my $uri=$hash{'src_'.$resid};
374: $uri=~s/^\/adm\/wrapper//;
375: my @uriparts=split(/\//,$uri);
376: my $urifile=$uriparts[$#uriparts];
377: $#uriparts--;
378: my $uripath=join('/',@uriparts);
379: $uripath=~s/^\/res\///;
380: if ($uripath) {
381: my $uricond='0';
382: if (defined($hash{'conditions_'.$resid})) {
383: $uricond=$captured{$hash{'conditions_'.$resid}};
384: }
385: if (defined($acchash{'acc.res.'.$short.'.'.$uripath})) {
386: if ($acchash{'acc.res.'.$short.'.'.$uripath}=~
387: /(\&$urifile\:[^\&]*)/) {
388: my $replace=$1;
389: my $regexp=$replace;
390: $regexp=~s/\|/\\\|/g;
391: $acchash{'acc.res.'.$short.'.'.$uripath}
392: =~s/$regexp/$replace\|$uricond/;
393: } else {
394: $acchash{'acc.res.'.$short.'.'.$uripath}.=
395: $urifile.':'.$uricond.'&';
396: }
397: } else {
398: $acchash{'acc.res.'.$short.'.'.$uripath}=
399: '&'.$urifile.':'.$uricond.'&';
400: }
401: }
402: }
403: }
404: }
405: $acchash{'acc.res.'.$short.'.'}='&:0&';
406: my $courseuri=$uri;
407: $courseuri=~s/^\/res\///;
408: &Apache::lonnet::delenv('(acc\.|httpref\.)');
409: &Apache::lonnet::appenv(%acchash,
410: "request.course.id" => $short,
411: "request.course.fn" => $fn,
412: "request.course.uri" => $courseuri);
413: }
414:
415: # ------------------------------------- Selectively delete from randompick maps
416:
417: sub pickrandom {
418: my $randomoutentry='';
419: foreach my $rid (keys %randompick) {
420: my $rndpick=$randompick{$rid};
421: my $mpc=$hash{'map_pc_'.$hash{'src_'.$rid}};
422: # ------------------------------------------- put existing resources into array
423: my @currentrids=();
424: foreach (sort(keys(%hash))) {
425: if ($_=~/^src_($mpc\.\d+)/) {
426: if ($hash{'src_'.$1}) { push @currentrids, $1; }
427: }
428: }
429: # rids are number.number and we want to numercially sort on
430: # the second number
431: @currentrids=sort {
432: my (undef,$aid)=split(/\./,$a);
433: my (undef,$bid)=split(/\./,$b);
434: $aid <=> $bid;
435: } @currentrids;
436: next if ($#currentrids<$rndpick);
437: # -------------------------------- randomly eliminate the ones that should stay
438: my (undef,$id)=split(/\./,$rid);
439: if ($randompickseed{$rid}) { $id=$randompickseed{$rid}; }
440: my $rndseed=&Apache::lonnet::rndseed($id); # use id instead of symb
441: &Math::Random::random_set_seed_from_phrase($rndseed);
442: my @whichids=&Math::Random::random_permuted_index($#currentrids+1);
443: for (my $i=1;$i<=$rndpick;$i++) { $currentrids[$whichids[$i]]=''; }
444: #&Apache::lonnet::logthis("$id,$rndseed,".join(':',@whichids));
445: # -------------------------------------------------------- delete the leftovers
446: for (my $k=0; $k<=$#currentrids; $k++) {
447: if ($currentrids[$k]) {
448: $hash{'randomout_'.$currentrids[$k]}=1;
449: my ($mapid,$resid)=split(/\./,$currentrids[$k]);
450: $randomoutentry.='&'.
451: &Apache::lonnet::symbclean(
452: &Apache::lonnet::declutter($hash{'map_id_'.$mapid}).
453: '___'.$resid.'___'.
454: &Apache::lonnet::declutter($hash{'src_'.$currentrids[$k]})
455: ).'&';
456: }
457: }
458: }
459: if ($randomoutentry) {
460: &Apache::lonnet::appenv('acc.randomout' => $randomoutentry);
461: }
462: }
463:
464: # ---------------------------------------------------- Read map and all submaps
465:
466: sub readmap {
467: my $short=shift;
468: $short=~s/^\///;
469: my %cenv=&Apache::lonnet::coursedescription($short);
470: my $fn=$cenv{'fn'};
471: my $uri;
472: $short=~s/\//\_/g;
473: unless ($uri=$cenv{'url'}) {
474: &Apache::lonnet::logthis("<font color=blue>WARNING: ".
475: "Could not load course $short.</font>");
476: return 'No course data available.';
477: }
478: @cond=('true:normal');
479: unlink($fn.'.db');
480: unlink($fn.'_symb.db');
481: unlink($fn.'.state');
482: unlink($fn.'parms.db');
483: undef %randompick;
484: $retfurl='';
485: if ((tie(%hash,'GDBM_File',"$fn.db",&GDBM_WRCREAT(),0640)) &&
486: (tie(%parmhash,'GDBM_File',$fn.'_parms.db',&GDBM_WRCREAT(),0640))) {
487: %hash=();
488: %parmhash=();
489: $errtext='';
490: $pc=0;
491: my $furi=&Apache::lonnet::clutter($uri);
492: $hash{'src_0.0'}=$furi;
493: $hash{'title_0.0'}=&Apache::lonnet::metadata($uri,'title');
494: $hash{'ids_'.$furi}='0.0';
495: $hash{'is_map_0.0'}=1;
496: loadmap($uri);
497: if (defined($hash{'map_start_'.$uri})) {
498: &traceroute('0',$hash{'map_start_'.$uri},'&');
499: &accinit($uri,$short,$fn);
500: &pickrandom();
501: }
502: # ------------------------------------------------------------ Version tracking
503: # if (&Apache::lonnet::allowed('srm',$ENV{'request.course.id'})) {
504: # &Apache::lonnet::logthis('Will be version tracking');
505: # }
506: unless ((untie(%hash)) && (untie(%parmhash))) {
507: &Apache::lonnet::logthis("<font color=blue>WARNING: ".
508: "Could not untie coursemap $fn for $uri.</font>");
509: }
510: {
511: my $cfh;
512: if ($cfh=Apache::File->new(">$fn.state")) {
513: print $cfh join("\n",@cond);
514: } else {
515: &Apache::lonnet::logthis("<font color=blue>WARNING: ".
516: "Could not write statemap $fn for $uri.</font>");
517: }
518: }
519: } else {
520: &Apache::lonnet::logthis("<font color=blue>WARNING: ".
521: "Could not tie coursemap $fn for $uri.</font>");
522: }
523: &Apache::lonmsg::author_res_msg($ENV{'request.course.uri'},$errtext);
524: # ------------------------------------------------- Check for critical messages
525:
526: my @what=&Apache::lonnet::dump('critical',$ENV{'user.domain'},
527: $ENV{'user.name'});
528: if ($what[0]) {
529: if (($what[0] ne 'con_lost') && ($what[0]!~/^error\:/)) {
530: $retfurl='/adm/email?critical=display';
531: }
532: }
533: return ($retfurl,$errtext);
534: }
535:
536: # ------------------------------------------------------- Evaluate state string
537:
538: sub evalstate {
539:
540: my $fn=$ENV{'request.course.fn'}.'.state';
541: my $state='2';
542: if (-e $fn) {
543: my @conditions=();
544: {
545: my $fh=Apache::File->new($fn);
546: @conditions=<$fh>;
547: }
548: my $safeeval = new Safe;
549: my $safehole = new Safe::Hole;
550: $safeeval->permit("entereval");
551: $safeeval->permit(":base_math");
552: $safeeval->deny(":base_io");
553: $safehole->wrap(\&Apache::lonnet::EXT,$safeeval,'&EXT');
554: foreach (@conditions) {
555: my $line=$_;
556: chomp($line);
557: my ($condition,$weight)=split(/\:/,$_);
558: if ($safeeval->reval($condition)) {
559: if ($weight eq 'force') {
560: $state.='3';
561: } else {
562: $state.='2';
563: }
564: } else {
565: if ($weight eq 'stop') {
566: $state.='0';
567: } else {
568: $state.='1';
569: }
570: }
571: }
572: }
573: &Apache::lonnet::appenv('user.state.'.$ENV{'request.course.id'} => $state);
574: return $state;
575: }
576:
577: 1;
578: __END__
579:
580: =head1 NAME
581:
582: Apache::lonuserstate - Construct and maintain state and binary representation
583: of course for user
584:
585: =head1 SYNOPSIS
586:
587: Invoked by lonroles.pm.
588:
589: &Apache::lonuserstate::readmap($cdom.'/'.$cnum);
590:
591: =head1 INTRODUCTION
592:
593: This module constructs and maintains state and binary representation
594: of course for user.
595:
596: This is part of the LearningOnline Network with CAPA project
597: described at http://www.lon-capa.org.
598:
599: =head1 HANDLER SUBROUTINE
600:
601: There is no handler subroutine.
602:
603: =head1 OTHER SUBROUTINES
604:
605: =over 4
606:
607: =item *
608:
609: loadmap() : Loads map from disk
610:
611: =item *
612:
613: simplify() : Simplify expression
614:
615: =item *
616:
617: traceroute() : Build condition hash
618:
619: =item *
620:
621: accinit() : Cascading conditions, quick access, parameters
622:
623: =item *
624:
625: readmap() : Read map and all submaps
626:
627: =item *
628:
629: evalstate() : Evaluate state string
630:
631: =back
632:
633: =cut
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