version 1.1, 2000/10/03 20:33:06
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version 1.29, 2002/08/18 21:45:41
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# |
# |
# Page flip handler |
# Page flip handler |
# |
# |
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# $Id$ |
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# |
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# Copyright Michigan State University Board of Trustees |
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# |
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# This file is part of the LearningOnline Network with CAPA (LON-CAPA). |
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# |
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# LON-CAPA is free software; you can redistribute it and/or modify |
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# it under the terms of the GNU General Public License as published by |
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# the Free Software Foundation; either version 2 of the License, or |
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# (at your option) any later version. |
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# |
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# LON-CAPA is distributed in the hope that it will be useful, |
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# but WITHOUT ANY WARRANTY; without even the implied warranty of |
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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# GNU General Public License for more details. |
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# |
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# You should have received a copy of the GNU General Public License |
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# along with LON-CAPA; if not, write to the Free Software |
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# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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# |
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# /home/httpd/html/adm/gpl.txt |
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# |
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# http://www.lon-capa.org/ |
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# |
# (Page Handler |
# (Page Handler |
# |
# |
# (TeX Content Handler |
# (TeX Content Handler |
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# 08/30,08/31,09/06,09/14,09/15,09/16,09/19,09/20,09/21,09/23, |
# 08/30,08/31,09/06,09/14,09/15,09/16,09/19,09/20,09/21,09/23, |
# 10/02 Gerd Kortemeyer) |
# 10/02 Gerd Kortemeyer) |
# |
# |
# 10/03 Gerd Kortemeyer |
# 10/03,10/05,10/06,10/07,10/09,10/10,10/11,10/16,10/17, |
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# 11/14,11/16, |
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# 10/01/01,05/01,05/28,07/05 Gerd Kortemeyer |
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package Apache::lonpageflip; |
package Apache::lonpageflip; |
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use strict; |
use strict; |
use Apache::Constants qw(:common :http); |
use Apache::Constants qw(:common :http REDIRECT); |
use Apache::lonnet(); |
use Apache::lonnet(); |
use HTML::TokeParser; |
use HTML::TokeParser; |
use GDBM_File; |
use GDBM_File; |
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# -------------------------------------------------------------- Module Globals |
# ========================================================== Module Global Hash |
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my %hash; |
my %hash; |
my @rows; |
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# ------------------------------------------------------------------ Euclid gcd |
sub addrid { |
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my ($current,$new,$condid)=@_; |
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unless ($condid) { $condid=0; } |
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if ($current) { |
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$current.=','.$new; |
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} else { |
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$current=''.$new; |
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} |
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sub euclid { |
return $current; |
my ($e,$f)=@_; |
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my $a; my $b; my $r; |
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if ($e>$f) { $b=$e; $r=$f; } else { $r=$e; $b=$f; } |
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while ($r!=0) { |
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$a=$b; $b=$r; |
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$r=$a%$b; |
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} |
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return $b; |
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} |
} |
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# ------------------------------------------------------------ Build page table |
sub fullmove { |
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my ($rid,$mapurl,$direction)=@_; |
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if (tie(%hash,'GDBM_File',$ENV{'request.course.fn'}.'.db', |
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&GDBM_READER(),0640)) { |
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($rid,$mapurl)=&move($rid,$mapurl,$direction); |
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untie(%hash); |
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} |
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return($rid,$mapurl); |
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} |
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sub tracetable { |
sub move { |
my ($sofar,$rid,$beenhere)=@_; |
my ($rid,$mapurl,$direction)=@_; |
my $further=$sofar; |
my $startoutrid=$rid; |
unless ($beenhere=~/\&$rid\&/) { |
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$beenhere.=$rid.'&'; |
my $next=''; |
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if (defined($hash{'is_map_'.$rid})) { |
my $mincond=1; |
if ((defined($hash{'map_start_'.$hash{'src_'.$rid}})) && |
my $posnext=''; |
(defined($hash{'map_finish_'.$hash{'src_'.$rid}}))) { |
if ($direction eq 'forward') { |
my $frid=$hash{'map_finish_'.$hash{'src_'.$rid}}; |
# --------------------------------------------------------------------- Forward |
$sofar= |
if ($hash{'type_'.$rid} eq 'finish') { |
&tracetable($sofar,$hash{'map_start_'.$hash{'src_'.$rid}}, |
$rid=$hash{'ids_'.&Apache::lonnet::clutter($mapurl)}; |
'&'.$frid.'&'); |
} |
$sofar++; |
map { |
if ($hash{'src_'.$frid}) { |
my $thiscond= |
my $brepriv=&Apache::lonnet::allowed('bre',$hash{'src_'.$frid}); |
&Apache::lonnet::directcondval($hash{'condid_'.$hash{'undercond_'.$_}}); |
if (($brepriv eq '2') || ($brepriv eq 'F')) { |
if ($thiscond>=$mincond) { |
if (defined($rows[$sofar])) { |
if ($posnext) { |
$rows[$sofar].='&'.$frid; |
$posnext.=','.$_.':'.$thiscond; |
} else { |
} else { |
$rows[$sofar]=$frid; |
$posnext=$_.':'.$thiscond; |
} |
} |
} |
if ($thiscond>$mincond) { $mincond=$thiscond; } |
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} |
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} split(/\,/,$hash{'to_'.$rid}); |
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map { |
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my ($linkid,$condval)=split(/\:/,$_); |
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if ($condval>=$mincond) { |
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$next=&addrid($next,$hash{'goesto_'.$linkid}, |
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$hash{'condid_'.$hash{'undercond_'.$linkid}}); |
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} |
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} split(/\,/,$posnext); |
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if ($hash{'is_map_'.$next}) { |
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# This jumps to the beginning of a new map (going down level) |
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if ( |
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$hash{'map_type_'.$hash{'map_pc_'.$hash{'src_'.$next}}} eq 'sequence') { |
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$mapurl=$hash{'src_'.$next}; |
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$next=$hash{'map_start_'.$hash{'src_'.$next}}; |
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} |
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} elsif |
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((split(/\./,$startoutrid))[0]!=(split(/\./,$next))[0]) { |
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# This comes up from a map (coming up one level); |
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$mapurl=$hash{'map_id_'.(split(/\./,$next))[0]}; |
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} |
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} elsif ($direction eq 'back') { |
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# ------------------------------------------------------------------- Backwards |
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if ($hash{'type_'.$rid} eq 'start') { |
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$rid=$hash{'ids_'.&Apache::lonnet::clutter($mapurl)}; |
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} |
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map { |
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my $thiscond= |
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&Apache::lonnet::directcondval($hash{'condid_'.$hash{'undercond_'.$_}}); |
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if ($thiscond>=$mincond) { |
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if ($posnext) { |
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$posnext.=','.$_.':'.$thiscond; |
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} else { |
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$posnext=$_.':'.$thiscond; |
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} |
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if ($thiscond>$mincond) { $mincond=$thiscond; } |
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} |
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} split(/\,/,$hash{'from_'.$rid}); |
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map { |
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my ($linkid,$condval)=split(/\:/,$_); |
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if ($condval>=$mincond) { |
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$next=&addrid($next,$hash{'comesfrom_'.$linkid}, |
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$hash{'condid_'.$hash{'undercond_'.$linkid}}); |
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} |
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} split(/\,/,$posnext); |
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if ($hash{'is_map_'.$next}) { |
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# This jumps to the end of a new map (going down one level) |
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if ( |
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$hash{'map_type_'.$hash{'map_pc_'.$hash{'src_'.$next}}} eq 'sequence') { |
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$mapurl=$hash{'src_'.$next}; |
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$next=$hash{'map_finish_'.$hash{'src_'.$next}}; |
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} |
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} elsif |
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((split(/\./,$startoutrid))[0]!=(split(/\./,$next))[0]) { |
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# This comes back up from a map (going up one level); |
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$mapurl=$hash{'map_id_'.(split(/\./,$next))[0]}; |
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} |
} |
} |
} |
return ($next,$mapurl); |
} else { |
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$sofar++; |
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if ($hash{'src_'.$rid}) { |
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my $brepriv=&Apache::lonnet::allowed('bre',$hash{'src_'.$rid}); |
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if (($brepriv eq '2') || ($brepriv eq 'F')) { |
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if (defined($rows[$sofar])) { |
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$rows[$sofar].='&'.$rid; |
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} else { |
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$rows[$sofar]=$rid; |
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} |
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} |
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} |
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} |
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if (defined($hash{'to_'.$rid})) { |
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map { |
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my $now=&tracetable($sofar,$hash{'goesto_'.$_},$beenhere); |
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if ($now>$further) { $further=$now; } |
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} split(/\,/,$hash{'to_'.$rid}); |
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} |
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} |
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return $further; |
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} |
} |
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# ================================================================ Main Handler |
# ================================================================ Main Handler |
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sub handler { |
sub handler { |
my $r=shift; |
my $r=shift; |
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# ------------------------------------------- Set document type for header only |
# ------------------------------------------- Set document type for header only |
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# if ($r->headers_only) { |
if ($r->header_only) { |
$r->content_type('text/html'); |
$r->content_type('text/html'); |
$r->send_http_header; |
$r->send_http_header; |
# return OK; |
return OK; |
# } |
} |
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$r->print('<html><body>'.$ENV{'form.postdata'}.'</body></html>'); |
my %cachehash=(); |
return OK; |
my $multichoice=0; |
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my %multichoicehash=(); |
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my $redirecturl=''; |
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my $next=''; |
my $requrl=$r->uri; |
my @possibilities=(); |
# ----------------------------------------------------------------- Tie db file |
if (($ENV{'form.postdata'})&&($ENV{'request.course.fn'})) { |
if ($ENV{'request.course.fn'}) { |
$ENV{'form.postdata'}=~/(\w+)\:(.*)/; |
my $fn=$ENV{'request.course.fn'}; |
my $direction=$1; |
if (-e "$fn.db") { |
my $currenturl=$2; |
if (tie(%hash,'GDBM_File',"$fn.db",&GDBM_READER,0640)) { |
if ($direction eq 'return') { |
# ------------------------------------------------------------------- Hash tied |
# -------------------------------------------------------- Return to last known |
my $firstres=$hash{'map_start_'.$requrl}; |
my $last; |
my $lastres=$hash{'map_finish_'.$requrl}; |
if (tie(%hash,'GDBM_File',$ENV{'request.course.fn'}.'_symb.db', |
if (($firstres) && ($lastres)) { |
&GDBM_READER(),0640)) { |
# ----------------------------------------------------------------- Render page |
$last=$hash{'last_known'}; |
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untie(%hash); |
@rows=(); |
} |
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my $newloc; |
&tracetable(0,$firstres,'&'.$lastres.'&'); |
if ($last) { |
if ($hash{'src_'.$lastres}) { |
$newloc=&Apache::lonnet::clutter((split(/\_\_\_/,$last))[1]); |
my $brepriv= |
} else { |
&Apache::lonnet::allowed('bre',$hash{'src_'.$lastres}); |
$newloc='/adm/noidea.html'; |
if (($brepriv eq '2') || ($brepriv eq 'F')) { |
} |
$rows[$#rows+1]=''.$lastres; |
$r->content_type('text/html'); |
} |
$r->header_out(Location => |
} |
'http://'.$ENV{'HTTP_HOST'}.$newloc); |
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# ------------------------------------------------------------ Add to symb list |
return REDIRECT; |
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} |
my $i; |
$currenturl=~s/^http\:\/\///; |
my %symbhash=(); |
$currenturl=~s/^[^\/]+//; |
for ($i=0;$i<=$#rows;$i++) { |
unless (($currenturl=~/^\/res\//) || |
if ($rows[$i]) { |
($currenturl=~/^\/adm\/wrapper\//)) { |
my @colcont=split(/\&/,$rows[$i]); |
my $last; |
map { |
if (tie(%hash,'GDBM_File',$ENV{'request.course.fn'}.'_symb.db', |
$symbhash{$hash{'src_'.$_}}=''; |
&GDBM_READER(),0640)) { |
} @colcont; |
$last=$hash{'last_known'}; |
} |
untie(%hash); |
} |
} |
&Apache::lonnet::symblist($requrl,%symbhash); |
if ($last) { |
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$currenturl=&Apache::lonnet::clutter((split(/\_\_\_/,$last))[1]); |
# ------------------------------------------------------------------ Page parms |
} else { |
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$r->content_type('text/html'); |
my $j; |
$r->header_out(Location => |
my $lcm=1; |
'http://'.$ENV{'HTTP_HOST'}.'/adm/noidea.html'); |
my $contents=0; |
return REDIRECT; |
my $nforms=0; |
} |
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} |
my %ssibody=(); |
# ------------------------------------------- Do we have any idea where we are? |
my %ssibgcolor=(); |
my $position; |
my %ssitext=(); |
if ($position=Apache::lonnet::symbread($currenturl)) { |
my %ssilink=(); |
# ------------------------------------------------------------------------- Yes |
my %ssivlink=(); |
my ($startoutmap,$mapnum,$thisurl)=split(/\_\_\_/,$position); |
my %ssialink=(); |
$cachehash{$startoutmap}{$thisurl}=$mapnum; |
my %cellemb=(); |
$cachehash{$startoutmap}{'last_known'}= |
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&Apache::lonnet::declutter($currenturl); |
my $allscript=''; |
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my $allmeta=''; |
# ============================================================ Tie the big hash |
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if (tie(%hash,'GDBM_File',$ENV{'request.course.fn'}.'.db', |
my $isxml=0; |
&GDBM_READER(),0640)) { |
my $xmlheader=''; |
my $rid=$hash{'map_pc_'.&Apache::lonnet::clutter($startoutmap)}. |
my $xmlbody=''; |
'.'.$mapnum; |
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# --------------------------------------------- Get SSI output, post parameters |
# ------------------------------------------------- Move forward, backward, etc |
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my $endupmap; |
for ($i=0;$i<=$#rows;$i++) { |
($next,$endupmap)=&move($rid,$startoutmap,$direction); |
if ($rows[$i]) { |
# -------------------------------------- Do we have one and only one empty URL? |
$contents++; |
my $safecount=0; |
my @colcont=split(/\&/,$rows[$i]); |
while (($next) && ($next!~/\,/) && |
$lcm*=($#colcont+1)/euclid($lcm,($#colcont+1)); |
((!$hash{'src_'.$next}) || ($hash{'randomout_'.$next})) |
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&& ($safecount<10000)) { |
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($next,$endupmap)=&move($next,$endupmap,$direction); |
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$safecount++; |
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} |
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# We are now at at least one non-empty URL |
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# ----------------------------------------------------- Check out possibilities |
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if ($next) { |
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@possibilities=split(/\,/,$next); |
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if ($#possibilities==0) { |
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# ---------------------------------------------- Only one possibility, redirect |
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$redirecturl=$hash{'src_'.$next}; |
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$cachehash{$endupmap} |
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{&Apache::lonnet::declutter($redirecturl)} |
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=(split(/\./,$next))[1]; |
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} else { |
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# ------------------------ There are multiple possibilities for a next resource |
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$multichoice=1; |
map { |
map { |
my $src=$hash{'src_'.$_}; |
$multichoicehash{'src_'.$_}=$hash{'src_'.$_}; |
$src=~/\.(\w+)$/; |
$multichoicehash{'title_'.$_}=$hash{'title_'.$_}; |
$cellemb{$_}=Apache::lonnet::fileembstyle($1); |
$multichoicehash{'type_'.$_}=$hash{'type_'.$_}; |
if ($cellemb{$_} eq 'ssi') { |
my ($choicemap,$choiceres)=split(/\./,$_); |
# --------------------------------------------------------- This is an SSI cell |
$cachehash |
my $prefix=$_.'_'; |
{&Apache::lonnet::declutter($hash{'src_'.$choicemap})} |
my %posthash=('request.prefix' => $prefix); |
{&Apache::lonnet::declutter( |
if (($ENV{'form.'.$prefix.'submit'}) |
$multichoicehash |
|| ($ENV{'form.all_submit'})) { |
{'src_'.$_} |
map { |
)} |
if ($_=~/^form.$prefix/) { |
=$choiceres; |
my $name=$_; |
} @possibilities; |
$name=~s/^form.$prefix//; |
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$posthash{$name}=$ENV{$_}; |
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} |
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} keys %ENV; |
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} |
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my $output=Apache::lonnet::ssi($src,%posthash); |
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my $parser=HTML::TokeParser->new(\$output); |
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my $token; |
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my $bodydef=0; |
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my $thisxml=0; |
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if ($output=~/\?xml/) { |
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$isxml=1; |
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$thisxml=1; |
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$output=~ |
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/((?:\<(?:\?xml|\!DOC|html)[^\>]*(?:\>|\>\]\>)\s*)+)\<body[^\>]*\>/si; |
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$xmlheader=$1; |
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} |
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while (($bodydef==0) && |
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($token=$parser->get_token)) { |
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if ($token->[1] eq 'body') { |
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$bodydef=1; |
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$ssibgcolor{$_}=$token->[2]->{'bgcolor'}; |
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$ssitext{$_}=$token->[2]->{'text'}; |
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$ssilink{$_}=$token->[2]->{'link'}; |
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$ssivlink{$_}=$token->[2]->{'vlink'}; |
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$ssialink{$_}=$token->[2]->{'alink'}; |
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if ($thisxml) { |
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$xmlbody=$token->[4]; |
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} |
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} |
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if ($token->[1] eq 'meta') { |
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$allmeta.="\n".$token->[4].'</meta>'; |
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} |
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if ($token->[1] eq 'script') { |
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$allscript.="\n\n" |
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.$parser->get_text('/script'); |
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} |
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} |
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if ($output=~/\<body[^\>]*\>(.*)/si) { |
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$output=$1; |
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} |
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$output=~s/\<\/body\>.*//si; |
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if ($output=~/\<form/si) { |
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$nforms++; |
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$output=~s/\<form[^\>]*\>//gsi; |
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$output=~s/\<\/form[^\>]*\>//gsi; |
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} |
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$ssibody{$_}=$output; |
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# ---------------------------------------------------------------- End SSI cell |
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} |
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} @colcont; |
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} |
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} |
} |
unless ($contents) { |
} else { |
$r->content_type('text/html'); |
# -------------------------------------------------------------- No place to go |
$r->send_http_header; |
$multichoice=-1; |
$r->print('<html><body>Empty page.</body></html>'); |
} |
} else { |
# ----------------- The program must come past this point to untie the big hash |
# ------------------------------------------------------------------ Build page |
untie(%hash); |
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# --------------------------------------------------------- Store position info |
# ---------------------------------------------------------------- Send headers |
$cachehash{$startoutmap}{'last_direction'}=$direction; |
if ($isxml) { |
foreach my $thismap (keys %cachehash) { |
$r->content_type('text/xml'); |
&Apache::lonnet::symblist($thismap,%{$cachehash{$thismap}}); |
$r->send_http_header; |
} |
$r->print($xmlheader); |
# ============================================== Do not return before this line |
} else { |
if ($redirecturl) { |
$r->content_type('text/html'); |
# ----------------------------------------------------- There is a URL to go to |
$r->send_http_header; |
$r->content_type('text/html'); |
$r->print('<html>'); |
$r->header_out(Location => |
} |
'http://'.$ENV{'HTTP_HOST'}.$redirecturl); |
# ------------------------------------------------------------------------ Head |
return REDIRECT; |
$r->print("\n<head>\n".$allmeta); |
} else { |
if ($allscript) { |
# --------------------------------------------------------- There was a problem |
$r->print("\n<script>\n".$allscript."\n</script>\n"); |
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} |
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$r->print("\n</head>\n"); |
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# ------------------------------------------------------------------ Start body |
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if ($isxml) { |
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$r->print($xmlbody); |
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} else { |
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$r->print('<body bgcolor="#FFFFFF">'); |
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} |
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# ------------------------------------------------------------------ Start form |
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if ($nforms) { |
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$r->print('<form method="post" action="'. |
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$requrl.'">'); |
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} |
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# ----------------------------------------------------------------- Start table |
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$r->print('<table cols="'.$lcm.'" border="0">'); |
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for ($i=0;$i<=$#rows;$i++) { |
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if ($rows[$i]) { |
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$r->print("\n<tr>"); |
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my @colcont=split(/\&/,$rows[$i]); |
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my $avespan=$lcm/($#colcont+1); |
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for ($j=0;$j<=$#colcont;$j++) { |
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my $rid=$colcont[$j]; |
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$r->print('<td colspan="'.$avespan.'"'); |
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if ($cellemb{$rid} eq 'ssi') { |
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if ($ssibgcolor{$rid}) { |
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$r->print(' bgcolor="'. |
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$ssibgcolor{$rid}.'"'); |
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} |
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$r->print('><font'); |
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if ($ssitext{$rid}) { |
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$r->print(' text="'.$ssitext{$rid}.'"'); |
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} |
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if ($ssilink{$rid}) { |
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$r->print(' link="'.$ssilink{$rid}.'"'); |
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} |
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if ($ssitext{$rid}) { |
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$r->print(' vlink="'.$ssivlink{$rid}.'"'); |
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} |
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if ($ssialink{$rid}) { |
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$r->print(' alink="'.$ssialink{$rid}.'"'); |
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} |
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$r->print('>'.$ssibody{$rid}.'</font>'); |
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} elsif ($cellemb{$rid} eq 'img') { |
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$r->print('><img src="'. |
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$hash{'src_'.$rid}.'"></img>'); |
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} |
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$r->print('</td>'); |
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} |
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$r->print('</tr>'); |
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} |
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} |
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$r->print("\n</table>"); |
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# ---------------------------------------------------------------- Submit, etc. |
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if ($nforms) { |
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$r->print( |
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'<input name="all_submit" value="Submit All" type="'. |
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(($nforms>1)?'submit':'hidden').'"></input></form>'); |
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} |
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$r->print('</body></html>'); |
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# -------------------------------------------------------------------- End page |
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} |
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# ------------------------------------------------------------- End render page |
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} else { |
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$r->content_type('text/html'); |
$r->content_type('text/html'); |
$r->send_http_header; |
$r->send_http_header; |
$r->print('<html><body>Page undefined.</body></html>'); |
if ($#possibilities>0) { |
} |
$r->print(<<ENDSTART); |
# ------------------------------------------------------------------ Untie hash |
<head><title>Choose Next Location</title></head> |
unless (untie(%hash)) { |
<body bgcolor="#FFFFFF"> |
&Apache::lonnet::logthis("<font color=blue>WARNING: ". |
<h1>LON-CAPA</h1> |
"Could not untie coursemap $fn (browse).</font>"); |
There are several possibilities of where to go next. |
} |
<p> |
# -------------------------------------------------------------------- All done |
Please click on the the resource you intend to access: |
return OK; |
<p> |
# ----------------------------------------------- Errors, hash could no be tied |
<table border=2> |
|
<tr><th>Title</th><th>Type</th></tr> |
|
ENDSTART |
|
foreach (@possibilities) { |
|
$r->print( |
|
'<tr><td><a href="'. |
|
$multichoicehash{'src_'.$_}.'">'. |
|
$multichoicehash{'title_'.$_}. |
|
'</a></td><td>'.$multichoicehash{'type_'.$_}. |
|
'</td></tr>'); |
|
} |
|
$r->print('</table></body></html>'); |
|
return OK; |
|
} else { |
|
$r->print(<<ENDNONE); |
|
<head><title>Choose Next Location</title></head> |
|
<body bgcolor="#FFFFFF"> |
|
<img src="/adm/lonIcons/lonlogos.gif" align=right> |
|
<h1>Sorry!</h1> |
|
<h2>Next resource could not be identified.</h2> |
|
<h3>You probably are at the beginning or the end of the course.</h3> |
|
</body> |
|
</html> |
|
ENDNONE |
|
return OK; |
|
} |
|
} |
|
} else { |
|
# ------------------------------------------------- Problem, could not tie hash |
|
$ENV{'user.error.msg'}="/adm/flip:bre:0:1:Course Data Missing"; |
|
return HTTP_NOT_ACCEPTABLE; |
} |
} |
} |
} else { |
} |
# ---------------------------------------- No, could not determine where we are |
$ENV{'user.error.msg'}="$requrl:bre:0:0:Course not initialized"; |
$r->internal_redirect('/adm/ambiguous'); |
return HTTP_NOT_ACCEPTABLE; |
} |
|
} else { |
|
# -------------------------- Class was not initialized or page fliped strangely |
|
$ENV{'user.error.msg'}="/adm/flip:bre:0:0:Choose Course"; |
|
return HTTP_NOT_ACCEPTABLE; |
|
} |
} |
} |
|
|
1; |
1; |