version 1.3, 2000/10/07 22:30:30
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version 1.18, 2001/11/29 19:23:49
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# |
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# Page flip handler |
# Page flip handler |
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# |
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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) |
# |
# |
# 10/03,10/05,10/06,10/07 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; |
Line 25 use GDBM_File;
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Line 51 use GDBM_File;
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my %hash; |
my %hash; |
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sub addrid { |
sub addrid { |
my ($current,$new)=@_; |
my ($current,$new,$condid)=@_; |
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unless ($condid) { $condid=0; } |
if (&Apache::lonnet::allowed('bre',$hash{'src_'.$new})) { |
if (&Apache::lonnet::allowed('bre',$hash{'src_'.$new})) { |
if ($current) { |
if ($current) { |
$current.=','.$new; |
$current.=','.$new; |
Line 36 sub addrid {
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Line 63 sub addrid {
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return $current; |
return $current; |
} |
} |
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sub move { |
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my ($rid,$mapurl,$direction)=@_; |
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my $next=''; |
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my $mincond=1; |
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my $posnext=''; |
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if ($direction eq 'forward') { |
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# --------------------------------------------------------------------- Forward |
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if ($hash{'type_'.$rid} eq 'finish') { |
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$rid=$hash{'ids_/res/'.$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(/\,/,$hash{'to_'.$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_'.$next}) { |
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if ( |
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$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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} |
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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=$hash{'ids_/res/'.$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_'.$next}) { |
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if ( |
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$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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} |
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} |
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return ($next,$mapurl); |
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} |
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# ================================================================ Main Handler |
# ================================================================ Main Handler |
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sub handler { |
sub handler { |
Line 49 sub handler {
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Line 150 sub handler {
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return OK; |
return OK; |
} |
} |
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my %cachehash=(); |
# --------BEGIN DEBUG ONLY TRASH |
my $multichoice=0; |
$r->content_type('text/html'); |
my %multichoicehash=(); |
$r->send_http_header; |
my $redirecturl=''; |
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my $next=''; |
$r->print('<html><body>'); |
my @possibilities=(); |
# --------END DEBUG ONLY TRASH |
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my %cachehash=(); |
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my $redir=0; |
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if (($ENV{'form.postdata'})&&($ENV{'request.course.fn'})) { |
if (($ENV{'form.postdata'})&&($ENV{'request.course.fn'})) { |
$ENV{'form.postdata'}=~/(\w+)\:(.*)/; |
$ENV{'form.postdata'}=~/(\w+)\:(.*)/; |
my $direction=$1; |
my $direction=$1; |
my $currenturl=$2; |
my $currenturl=$2; |
my $redirecturl=$currenturl; |
if ($direction eq 'return') { |
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# -------------------------------------------------------- Return to last known |
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my $last; |
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if (tie(%hash,'GDBM_File',$ENV{'request.course.fn'}.'_symb.db', |
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&GDBM_READER,0640)) { |
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$last=$hash{'last_known'}; |
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untie(%hash); |
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} |
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my $newloc; |
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if ($last) { |
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$newloc='/res/'.(split(/\_\_\_/,$last))[1]; |
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} else { |
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$newloc='/adm/noidea.html'; |
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} |
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$r->content_type('text/html'); |
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$r->header_out(Location => |
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'http://'.$ENV{'HTTP_HOST'}.$newloc); |
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return REDIRECT; |
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} |
$currenturl=~s/^http\:\/\///; |
$currenturl=~s/^http\:\/\///; |
$currenturl=~s/^[^\/]+//; |
$currenturl=~s/^[^\/]+//; |
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unless (($currenturl=~/^\/res\//) || |
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($currenturl=~/^\/adm\/wrapper\//)) { |
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my $last; |
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if (tie(%hash,'GDBM_File',$ENV{'request.course.fn'}.'_symb.db', |
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&GDBM_READER,0640)) { |
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$last=$hash{'last_known'}; |
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untie(%hash); |
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} |
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if ($last) { |
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$currenturl='/res/'.(split(/\_\_\_/,$last))[1]; |
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} else { |
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$r->content_type('text/html'); |
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$r->header_out(Location => |
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'http://'.$ENV{'HTTP_HOST'}.'/adm/noidea.html'); |
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return REDIRECT; |
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} |
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} |
# ------------------------------------------- Do we have any idea where we are? |
# ------------------------------------------- Do we have any idea where we are? |
my $position; |
my $position; |
if ($position=Apache::lonnet::symbread($currenturl)) { |
if ($position=Apache::lonnet::symbread($currenturl)) { |
# ------------------------------------------------------------------------- Yes |
# ------------------------------------------------------------------------- Yes |
my ($mapurl,$mapnum,$thisurl)=split(/\_\_\_/,$position); |
my ($mapurl,$mapnum,$thisurl)=split(/\_\_\_/,$position); |
$cachehash{$thisurl}=$mapnum; |
$cachehash{$thisurl}=$mapnum; |
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# ============================================================ Tie the big hash |
if (tie(%hash,'GDBM_File',$ENV{'request.course.fn'}.'.db', |
if (tie(%hash,'GDBM_File',$ENV{'request.course.fn'}.'.db', |
&GDBM_READER,0640)) { |
&GDBM_READER,0640)) { |
my $rid=$hash{'map_pc_/res/'.$mapurl}.'.'.$mapnum; |
my $rid=$hash{'map_pc_/res/'.$mapurl}.'.'.$mapnum; |
my $next=''; |
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if ($direction eq 'forward') { |
# ------------------------------------------------- Move forward, backward, etc |
map { |
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$next=&addrid($next,$hash{'goesto_'.$_}); |
($next,$mapurl)=&move($rid,$mapurl,$direction); |
} split(/\,/,$hash{'to_'.$rid}); |
# -------------------------------------- Do we have one and only one empty URL? |
my @possibilities=split(/,/,$next); |
my $safecount=0; |
if ($#possibilities==1) { |
while (($next) && ($next!~/\,/) && (!$hash{'src_'.$next}) |
my $goto=$possibilities[0]; |
&& ($safecount<25)) { |
} |
($next,$mapurl)=&move($next,$mapurl,$direction); |
} elsif ($direction eq 'back') { |
$safecount++; |
} elsif ($direction eq 'up') { |
} |
} elsif ($direction eq 'down') { |
# ----------------------------------------------------- Check out possibilities |
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if ($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{&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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$multichoice=1; |
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map { |
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$multichoicehash{'src_'.$_}=$hash{'src_'.$_}; |
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$multichoicehash{'title_'.$_}=$hash{'title_'.$_}; |
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$multichoicehash{'type_'.$_}=$hash{'type_'.$_}; |
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$cachehash |
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{&Apache::lonnet::declutter( |
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$multichoicehash |
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{'src_'.$_} |
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)} |
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=(split(/\./,$_))[1]; |
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} @possibilities; |
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} |
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} else { |
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# -------------------------------------------------------------- No place to go |
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$multichoice=-1; |
} |
} |
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# ----------------- The program must come past this point to untie the big hash |
untie(%hash); |
untie(%hash); |
$r->print($rid.' - '.$next); |
# --------------------------------------------------------- Store position info |
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$cachehash{'last_direction'}=$direction; |
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$cachehash{'last_known'}=&Apache::lonnet::declutter($currenturl); |
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&Apache::lonnet::symblist($mapurl,%cachehash); |
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# ============================================== Do not return before this line |
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if ($redirecturl) { |
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# ----------------------------------------------------- There is a URL to go to |
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$r->content_type('text/html'); |
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$r->header_out(Location => |
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'http://'.$ENV{'HTTP_HOST'}.$redirecturl); |
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return REDIRECT; |
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} else { |
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# --------------------------------------------------------- There was a problem |
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$r->content_type('text/html'); |
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$r->send_http_header; |
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if ($#possibilities>0) { |
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$r->print(<<ENDSTART); |
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<head><title>Choose Next Location</title></head> |
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<body bgcolor="#FFFFFF"> |
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<h1>LON-CAPA</h1> |
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There are several possibilities of where to go next. |
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<p> |
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Please click on the the resource you intend to access: |
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<p> |
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<table border=2> |
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<tr><th>Title</th><th>Type</th></tr> |
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ENDSTART |
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map { |
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$r->print( |
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'<tr><td><a href="'. |
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$multichoicehash{'src_'.$_}.'">'. |
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$multichoicehash{'title_'.$_}. |
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'</a></td><td>'.$multichoicehash{'type_'.$_}. |
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'</td></tr>'); |
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} @possibilities; |
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$r->print('</table></body></html>'); |
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return OK; |
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} else { |
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$r->print(<<ENDNONE); |
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<head><title>Choose Next Location</title></head> |
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<body bgcolor="#FFFFFF"> |
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<img src="/adm/lonIcons/lonlogos.gif" align=right> |
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<h1>Sorry!</h1> |
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<h2>Next resource could not be identified.</h2> |
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<h3>You probably are at the beginning or the end of the course.</h3> |
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</body> |
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</html> |
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ENDNONE |
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return OK; |
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} |
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} |
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} else { |
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# ------------------------------------------------- Problem, could not tie hash |
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$ENV{'user.error.msg'}="/adm/flip:bre:0:1:Course Data Missing"; |
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return HTTP_NOT_ACCEPTABLE; |
} |
} |
} else { |
} else { |
# -------------------------------------------------------------------------- No |
# ---------------------------------------- No, could not determine where we are |
$r->print('No idea '.$currenturl); |
$r->internal_redirect('/adm/ambiguous'); |
} |
} |
# -------------------------- Class was not initialized or page fliped strangely |
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} else { |
} else { |
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# -------------------------- Class was not initialized or page fliped strangely |
$ENV{'user.error.msg'}="/adm/flip:bre:0:0:Choose Course"; |
$ENV{'user.error.msg'}="/adm/flip:bre:0:0:Choose Course"; |
return HTTP_NOT_ACCEPTABLE; |
return HTTP_NOT_ACCEPTABLE; |
} |
} |
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# ------TRASH BELOW |
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# --------------------------- TRASH |
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$r->print('</body></html>'); |
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return OK; |
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# ========================================================= TOTAL TRASH |
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# &Apache::lonnet::symblist($requrl,%symbhash); |
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} |
} |
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1; |
1; |