[BACK]Return to lonsequence.pm CVS log [TXT] [DIR] Up to [LON-CAPA] / rat
File:  [LON-CAPA] / rat / lonsequence.pm
Revision 1.30: download - view: text, annotated - select for diffs
Tue Jan 16 21:19:11 2007 UTC (17 years, 4 months ago) by albertel
Branches: MAIN
CVS tags: version_2_4_X, version_2_4_2, version_2_4_1, version_2_4_0, version_2_3_X, version_2_3_99_0, version_2_3_2, version_2_3_1, HEAD
- display of maps with entities in titles was incorrect

# The LearningOnline Network with CAPA
#
# Sequence Handler
#
# $Id: lonsequence.pm,v 1.30 2007/01/16 21:19:11 albertel Exp $
#
# Copyright Michigan State University Board of Trustees
#
# This file is part of the LearningOnline Network with CAPA (LON-CAPA).
#
# LON-CAPA is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# LON-CAPA is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with LON-CAPA; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
#
# /home/httpd/html/adm/gpl.txt
#
# http://www.lon-capa.org/
#

package Apache::lonsequence;

use strict;
use Apache::lonnet;
use Apache::Constants qw(:common :http REDIRECT);
use GDBM_File;
use LONCAPA::map();
use Apache::lonpageflip();
use Apache::loncommon();
use Apache::lonlocal;
use HTML::Entities();

my %selhash;
my $successtied;

# ----------------------------------------- Attempt to read from resource space

sub attemptread {
    my $fn=shift;
    &Apache::lonnet::repcopy($fn);
    if (-e $fn) {
	return &LONCAPA::map::attemptread($fn);
    } else {
        return ();
    }
}

sub mapread {
    my $fn=shift;
    &Apache::lonnet::repcopy($fn);
    if (-e $fn) {
	return &LONCAPA::map::mapread($fn,'');
    } else {
        return ();
    }
}

# ---------------------------------------------------------------- View Handler

sub viewmap {
    my ($r,$url)=@_;

    my $js;
    if ($env{'form.forceselect'}) {
	$js = (<<ENDSCRIPT);
<script type="text/javascript">

function select_group() {
    window.location="/adm/groupsort?catalogmode=groupsec&mode=rat&acts="+document.forms.fileattr.acts.value;
}

function queue(val) {
    if (eval("document.forms."+val+".filelink.checked")) {
	var l=val.length;
	var v=val.substring(4,l);
	document.forms.fileattr.acts.value+='1a'+v+'b';
    }
    else {
	var l=val.length;
	var v=val.substring(4,l);
	document.forms.fileattr.acts.value+='0a'+v+'b';
    }
}

</script>
ENDSCRIPT
    }

    $r->print(&Apache::loncommon::start_page('Map Contents',$js).
	      '<h1>'.$url.'</h1>');
# ------------------ This is trying to select. Provide buttons and tie %selhash
    if ($env{'form.forceselect'}) { $r->print(<<ENDSELECT);
<form name=fileattr><input type=hidden name=acts value=''>
<input type="button" name="close" value='CLOSE' onClick="self.close()">
<input type="button" name="groupimport" value='GROUP IMPORT'
onClick="javascript:select_group()">
</form>   
ENDSELECT
    my $diropendb = 
    "/home/httpd/perl/tmp/$env{'user.domain'}\_$env{'user.name'}_sel_res.db";
        if (tie(%selhash,'GDBM_File',$diropendb,&GDBM_WRCREAT(),0640)) {
	    if ($env{'form.launch'} eq '1') {
	       &start_fresh_session();
	    }
            $successtied=1;

# - Evaluate actions from previous page (both cumulatively and chronologically)
        if ($env{'form.catalogmode'} eq 'import') {
	    my $acts=$env{'form.acts'};
	    my @Acts=split(/b/,$acts);
	    my %ahash;
	    my %achash;
	    my $ac=0;
	    # some initial hashes for working with data
	    foreach (@Acts) {
		my ($state,$ref)=split(/a/);
		$ahash{$ref}=$state;
		$achash{$ref}=$ac;
		$ac++;
	    }
	    # sorting through the actions and changing the tied database hash
	    foreach (sort {$achash{$a}<=>$achash{$b}} (keys %ahash)) {
		my $key=$_;
		if ($ahash{$key} eq '1') {
		    $selhash{'store_'.$selhash{'pre_'.$key.'_link'}}=
			$selhash{'pre_'.$key.'_title'};
		    $selhash{'storectr_'.$selhash{'pre_'.$key.'_link'}}=
			$selhash{'storectr'}+0;
		    $selhash{'storectr'}++;
		}
		if ($ahash{$key} eq '0') {
		    if ($selhash{'store_'.$selhash{'pre_'.$key.'_link'}}) {
		       delete $selhash{'store_'.$selhash{'pre_'.$key.'_link'}};
		    }
		}
	    }
	    # deleting the previously cached listing
	    foreach (keys %selhash) {
		if ($_ =~ /^pre_/ && $_ =~/link$/) {
		    my $key = $_;
		    $key =~ s/^pre_//;
		    $key =~ s/_[^_]*$//;
		    delete $selhash{'pre_'.$key.'_title'};
		    delete $selhash{'pre_'.$key.'_link'};
		}
	    }
	}
# -
        }
    }
# ----------------------------- successtied is now '1' if in working selectmode
    my ($errtext,$fatal)=&mapread(&Apache::lonnet::filelocation('',$url),'');
    if ($fatal==1) {
       $r->print('<p><b><font color="red">'.&mt('Map contents are not shown in order.').'</font></b></p><br />');
    }
    my $idx=0;
    foreach (&attemptread(&Apache::lonnet::filelocation('',$url))) {
	if (defined($_)) {
            $idx++;
            if ($successtied) { 
		$r->print('<form name="form'.$idx.'">');
            }
	    my ($title,$url)=split(/\:/,$_);
	    $title = &LONCAPA::map::qtescape($title);
	    unless ($title) { $title=(split(/\//,$url))[-1] };
            my $enc_title = &HTML::Entities::encode($title,'\'"<>&');
	    unless ($title) {
		$title='<i>'.&mt('Empty').'</i>';
		$enc_title = &mt('Empty');
	    }
	    $url  = &LONCAPA::map::qtescape($url);
            my $enc_url = &HTML::Entities::encode($url,'\'"<>&');
            if ($url) {
		if ($successtied) {
		    my $checked='';
	           if ($selhash{'store_'.$url}) {
	       	      $checked=" checked";
	           }
	           $selhash{"pre_${idx}_link"}=$url;
	           $selhash{"pre_${idx}_title"}=$title;
		    
		    $url  = &HTML::Entities::encode($url, '\'"<>&');
		    $r->print(<<ENDCHECKBOX);
<input type='checkbox' name='filelink' 
value='$enc_url' onClick='javascript:queue("form$idx")'$checked />
<input type='hidden' name='title' value='$enc_title' />
ENDCHECKBOX
                }
		$r->print('<a href="'.$enc_url.'">');
            }
            $r->print($enc_title);
            if ($url) { $r->print('</a>'); }
            if ($successtied) {
		$r->print('</form>');
            } else {
		$r->print('<br>');
            }
        }
    }
    $r->print(&Apache::loncommon::end_page());
    if ($successtied) {
	untie %selhash;
    }
}

# ----------------------------------------------------------- Clean out selhash
sub start_fresh_session {
    foreach (keys %selhash) {
	if ($_ =~ /^pre_/) {
	    delete $selhash{$_};
	}
	if ($_ =~ /^store/) {
	    delete $selhash{$_};
	}
    }
}


# ================================================================ Main Handler

sub handler {
   my $r=shift;

   if ($r->header_only) {
      &Apache::loncommon::content_type($r,'text/html');
      $r->send_http_header;
      return OK;
   }
 
   &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},
                                          ['forceselect','launch']);

   my %hash;
   my %bighash;
   my $requrl=$r->uri;

   $successtied=0;
# ------------------------------------------------------------ Tie symb db file
  my $disurl='';
  my $dismapid='';
  my $exitdisid = '';
  my $arrow_dir = '';

  if (($env{'request.course.fn'}) && (!$env{'form.forceselect'})) {
       my $last;
       if (tie(%hash,'GDBM_File',$env{'request.course.fn'}.'_symb.db',
                    &GDBM_READER(),0640)) {
	   $last=$hash{'last_direction'};
           untie(%hash);
       }
       my $direction='';
       my $prevmap='';
       if ($last) {
	   ($prevmap,undef,$direction)=&Apache::lonnet::decode_symb($last);
       }
# ------------------------------------------------------------- Tie big db file
       if (tie(%bighash,'GDBM_File',$env{'request.course.fn'}.'.db',
                    &GDBM_READER(),0640)) {
	   my $disid='';
           my $randomout ='';

           if ($direction eq 'back') {
	       $disid=$bighash{'map_finish_'.$requrl};
           } else {
               $disid=$bighash{'map_start_'.$requrl};
           }
           if ($disid) {
	       $disurl=$bighash{'src_'.$disid};
               $dismapid=(split(/\./,$disid))[1];
	       if (!$env{'request.role.adv'}) {
		   $randomout = $bighash{'randomout_'.$disid};
	       }
           } elsif (tie(%hash,'GDBM_File',$env{'request.course.fn'}.'_symb.db',
                    &GDBM_READER(),0640)) {
               $last=$hash{'last_known'};
               untie(%hash);
           }


# ----------- If this is an empty one, or hidden, skip to next non-empty or non-hidden one
           while ( ((!$disurl) && ($disid)) || ($randomout && $disid) ) {
	       $direction=($direction?$direction:'forward');
               ($disid,$requrl)=
                         &Apache::lonpageflip::fullmove($disid,
                           &Apache::lonnet::declutter($requrl),$direction);
               if ($disid) {
	           $disurl=$bighash{'src_'.$disid};
                   $dismapid=(split(/\./,$disid))[1];
		   if (!$env{'request.role.adv'}) {
		       $randomout = $bighash{'randomout_'.$disid};
		   }
               }
 	   }
           $exitdisid = $disid;
           $arrow_dir = $direction;

# --------------------------------------- Untie hash, make sure to come by here
           untie(%bighash);
       }
   }

# now either disurl is set (going to first page), or we need another display
   if ($disurl) {
# -------------------------------------------------- Has first or last resource
      &Apache::lonnet::symblist($requrl,$disurl => [$disurl,$dismapid],
				'last_known' => [$disurl,$dismapid]); 
      &Apache::loncommon::content_type($r,'text/html');
      $r->header_out(Location => 'http://'.$ENV{'HTTP_HOST'}.$disurl);
      return REDIRECT;
   } else {
       &Apache::loncommon::content_type($r,'text/html');
       $r->send_http_header;
       if ($exitdisid eq '' && $arrow_dir ne '') {
           my %lt =&Apache::lonlocal::texthash(
                   'back' => 'beginning',
                   'forward' => 'end',
                   'nere' => 'Next resource could not be displayed',
                   'goba' => 'Go Back',
                   'nacc' => 'Navigate Course Content',
                          );
           my $warnmsg = &mt('As all folders and sequences ');
           if ($arrow_dir eq 'forward') {
               $warnmsg .= &mt('following the current resource were empty').',';
           } elsif ($arrow_dir eq 'back') {
               $warnmsg .= &mt('preceding the current resource were empty').',';
           }
           $warnmsg .= &mt('you have now reached the').' '.$lt{$arrow_dir}.' '.&mt('of the course.');
           my $start_page=
	       &Apache::loncommon::start_page('Empty Folder/Sequence');
           my $end_page=
	       &Apache::loncommon::end_page();
           $r->print(<<ENDNONE);
$start_page
<h3>$lt{'nere'}</h3>
<p>$warnmsg</p>
<ul>
  <li><a href="javascript:history.go(-1)">$lt{'goba'}</a></li>
  <li><a href="/adm/navmaps">$lt{'nacc'}</a></li>
</ul>
$end_page
ENDNONE
       } else {
           &viewmap($r,$requrl);
       }
       return OK;
   }
}

1;
__END__
FreeBSD-CVSweb <freebsd-cvsweb@FreeBSD.org>
500 Internal Server Error

Internal Server Error

The server encountered an internal error or misconfiguration and was unable to complete your request.

Please contact the server administrator at root@localhost to inform them of the time this error occurred, and the actions you performed just before this error.

More information about this error may be available in the server error log.