[BACK]Return to lonhomework.pm CVS log [TXT] [DIR] Up to [LON-CAPA] / loncom / homework
File:  [LON-CAPA] / loncom / homework / lonhomework.pm
Revision 1.131: download - view: text, annotated - select for diffs
Fri May 23 06:25:53 2003 UTC (21 years ago) by albertel
Branches: MAIN
CVS tags: HEAD
- fixes BUG#1465, couldn't make a .exam as their aren't any templetes for it

# The LearningOnline Network with CAPA
# The LON-CAPA Homework handler
#
# $Id: lonhomework.pm,v 1.131 2003/05/23 06:25:53 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/
#
# Guy Albertelli
# 11/30 Gerd Kortemeyer
# 6/1,8/17,8/18 Gerd Kortemeyer
# 7/18 Jeremy Bowers

package Apache::lonhomework;
use strict;
use Apache::style();
use Apache::lonxml();
use Apache::lonnet();
use Apache::lonplot();
use Apache::inputtags();
use Apache::structuretags();
use Apache::randomlabel();
use Apache::response();
use Apache::hint();
use Apache::outputtags();
use Apache::caparesponse();
use Apache::radiobuttonresponse();
use Apache::optionresponse();
use Apache::imageresponse();
use Apache::essayresponse();
use Apache::externalresponse();
use Apache::rankresponse();
use Apache::matchresponse();
#use Apache::chemresponse();
use Apache::Constants qw(:common);
use HTML::Entities();
use Apache::loncommon();
#use Time::HiRes qw( gettimeofday tv_interval );

BEGIN {
  &Apache::lonxml::register_insert();
}

sub get_target {
  if (($ENV{'request.state'} eq "published") ||
      ($ENV{'request.state'} eq "uploaded")) {
    if ( defined($ENV{'form.grade_target'}  ) 
	 && ($ENV{'form.grade_target'} eq 'tex')) {
      return ($ENV{'form.grade_target'});
    } elsif ( defined($ENV{'form.grade_target'}  ) 
	 && ($Apache::lonhomework::viewgrades eq 'F' )) {
      return ($ENV{'form.grade_target'});
    }
 
    if ( defined($ENV{'form.submitted'}) &&
	 ( !defined($ENV{'form.resetdata'}))) {
      return ('grade', 'web');
    } else {
      return ('web');
    }
  } elsif ($ENV{'request.state'} eq "construct") {
    if ( defined($ENV{'form.grade_target'}) ) {
      return ($ENV{'form.grade_target'});
    }
    if ( defined($ENV{'form.preview'})) {
      if ( defined($ENV{'form.submitted'})) {
	return ('grade', 'web');
      } else {
	return ('web');
      }
    } else {
      if ( $ENV{'form.problemmode'} eq 'View' ||
	   $ENV{'form.problemmode'} eq 'Discard Edits and View') {
	if ( defined($ENV{'form.submitted'}) &&
	     (!defined($ENV{'form.resetdata'})) ) {
	  return ('grade', 'web','answer');
	} else {
	  return ('web','answer');
	}
      } elsif ( $ENV{'form.problemmode'} eq 'Edit' ) {
	if ( $ENV{'form.submitted'} eq 'edit' ) {
	  if ( $ENV{'form.submit'} eq 'Submit Changes and View' ) {
	    return ('modified','web','answer');
	  } else {
	    return ('modified','edit');
	  }
	} else {
	  return ('edit');
	}
      } else {
	return ('web');
      }
    }
  }
  return ();
}

sub setup_vars {
  my ($target) = @_;
  return ';'
#  return ';$external::target='.$target.';';
}

sub send_header {
  my ($request)= @_;
  $request->print(&Apache::lontexconvert::header());
#  $request->print('<form name='.$ENV{'form.request.prefix'}.'lonhomework method="POST" action="'.$request->uri.'">');
}

sub createmenu {
  my ($which,$request)=@_;
  if ($which eq 'grade') {
    $request->print('<script language="JavaScript"> 
          hwkmenu=window.open("/res/adm/pages/homeworkmenu.html","homeworkremote",
                 "height=350,width=150,menubar=no");
          </script>');
  }
}

sub send_footer {
  my ($request)= @_;
#  $request->print('</form>');
  $request->print(&Apache::lontexconvert::footer());
}

$Apache::lonxml::browse='';

# JB, 9/24/2002: Any changes in this function may require a change
# in lonnavmaps::resource::getDateStatus.
sub check_access {
  my ($id) = @_;
  my $date ='';
  my $status;
  my $datemsg = '';
  my $lastdate = '';
  my $temp;
  my $type;
  my $passed;

  if ($ENV{'request.state'} eq "construct") {
    &Apache::lonxml::debug("in construction ignoring dates");
    $status='CAN_ANSWER';
    $datemsg='is in under construction';
    return ($status,$datemsg);
  }

  &Apache::lonxml::debug("checking for part :$id:");
  &Apache::lonxml::debug("time:".time);
  foreach $temp ("opendate","duedate","answerdate") {
    $lastdate = $date;
    $date = &Apache::lonnet::EXT("resource.$id.$temp");
    my $thistype = &Apache::lonnet::EXT("resource.$id.$temp.type");
    if ($thistype =~ /^(con_lost|no_such_host)/ ||
	$date     =~ /^(con_lost|no_such_host)/) {
	$status='UNAVAILABLE';
	$date="may open later.";
	return($status,$date);
    }
    if ($thistype eq 'date_interval') {
	if ($temp eq 'opendate') {
           $date=&Apache::lonnet::EXT("resource.$id.duedate")-$date;
        }
        if ($temp eq 'answerdate') {
           $date=&Apache::lonnet::EXT("resource.$id.duedate")+$date;
        }
    }
    &Apache::lonxml::debug("found :$date: for :$temp:");
    if ($date eq '') {
      $date = "an unknown date"; $passed = 0;
    } elsif ($date eq 'con_lost') {
      $date = "an indeterminate date"; $passed = 0;
    } else {
      if (time < $date) { $passed = 0; } else { $passed = 1; }
      $date = localtime $date;
    }
    if (!$passed) { $type=$temp; last; }
  }
  &Apache::lonxml::debug("have :$type:$passed:");
  if ($passed) {
    $status='SHOW_ANSWER';
    $datemsg=$date;
  } elsif ($type eq 'opendate') {
    $status='CLOSED';
    $datemsg = "will open on $date";
  } elsif ($type eq 'duedate') {
    $status='CAN_ANSWER';
    $datemsg = "is due at $date";
  } elsif ($type eq 'answerdate') {
    $status='CLOSED';
    $datemsg = "was due on $lastdate, and answers will be available on $date";
  }
  if ($status eq 'CAN_ANSWER') {
    #check #tries, and if correct.
    my $tries = $Apache::lonhomework::history{"resource.$id.tries"};
    my $maxtries = &Apache::lonnet::EXT("resource.$id.maxtries");
    if ( $tries eq '' ) { $tries = '0'; }
    if ( $maxtries eq '' ) { $maxtries = '2'; } 
    if ($tries >= $maxtries) { $status = 'CANNOT_ANSWER'; }
    # if (correct and show prob status) or excused then CANNOT_ANSWER
    if(($Apache::lonhomework::history{"resource.$id.solved"}=~/^correct/
	&&
	lc($Apache::lonhomework::problemstatus) ne 'no')
       ||
       $Apache::lonhomework::history{"resource.$id.solved"}=~/^excused/) {
	$status = 'CANNOT_ANSWER';
    }
  }

  if (($status ne 'CLOSED') && ($Apache::lonhomework::type eq 'exam') &&
      (!$Apache::lonhomework::history{"resource.0.outtoken"})) {
      return ('UNCHECKEDOUT','needs to be checked out');
  }


  &Apache::lonxml::debug("sending back :$status:$datemsg:");
  if (($Apache::lonhomework::browse eq 'F') && ($status eq 'CLOSED')) {
    &Apache::lonxml::debug("should be allowed to browse a resource when closed");
    $status='CAN_ANSWER';
    $datemsg='is closed but you are allowed to view it';
  }

  return ($status,$datemsg);
}

sub showhash {
  my (%hash) = @_;
  &showhashsubset(\%hash,'.');
  return '';
}

sub showarray {
    my ($array)=@_;
    my $string="(";
    foreach my $elm (@{ $array }) {
	if (ref($elm)) {
	    if ($elm =~ /ARRAY/ ) {
		$string.=&showarray($elm);
	    }
	} else {
	    $string.="$elm,"
	}
    }
    chop($string);
    $string.=")";
    return $string;
}

sub showhashsubset {
  my ($hash,$keyre) = @_;
  my $resultkey;
  foreach $resultkey (sort keys %$hash) {
    if ($resultkey =~ /$keyre/) {
      if (ref($$hash{$resultkey})) {
	if ($$hash{$resultkey} =~ /ARRAY/ ) {
	    &Apache::lonxml::debug("$resultkey ---- ".
				   &showarray($$hash{$resultkey}));
	} elsif ($$hash{$resultkey} =~ /HASH/ ) {
	    &Apache::lonxml::debug("$resultkey ---- $$hash{$resultkey}");
	    &showhashsubset($$hash{$resultkey},'.');
	} else {
	    &Apache::lonxml::debug("$resultkey ---- $$hash{$resultkey}");
	}
      } else {
	&Apache::lonxml::debug("$resultkey ---- $$hash{$resultkey}");
      }
    }
  }
  &Apache::lonxml::debug("\n<br />restored values^</br>\n");
  return '';
}

sub setuppermissions {
  $Apache::lonhomework::browse= &Apache::lonnet::allowed('bre',$ENV{'request.filename'});
  my $viewgrades = &Apache::lonnet::allowed('vgr',$ENV{'request.course.id'});
  if (! $viewgrades && 
      exists($ENV{'request.course.sec'}) && 
      $ENV{'request.course.sec'} !~ /^\s*$/) {
      $viewgrades = &Apache::lonnet::allowed('vgr',$ENV{'request.course.id'}.
                                               '/'.$ENV{'request.course.sec'});
  }
  $Apache::lonhomework::viewgrades = $viewgrades;
  return ''
}

sub setupheader {
    my $request=$_[0];
    if ($ENV{'browser.mathml'}) {
	$request->content_type('text/xml');
    } else {
	$request->content_type('text/html');
    }
    $request->content_encoding('UTF-8');
    if (!$Apache::lonxml::debug && ($ENV{'REQUEST_METHOD'} eq 'GET')) {
	&Apache::loncommon::no_cache($request);
    }
    $request->send_http_header;
    return OK if $request->header_only;
    return ''
}

sub handle_save_or_undo {
  my ($request,$problem,$result) = @_;
  my $file    = &Apache::lonnet::filelocation("",$request->uri);
  my $filebak =$file.".bak";
  my $filetmp =$file.".tmp";
  my $error=0;

  if ($ENV{'form.Undo'} eq 'undo') {
    my $error=0;
    if (!copy($file,$filetmp)) { $error=1; }
    if ((!$error) && (!copy($filebak,$file))) { $error=1; }
    if ((!$error) && (!move($filetmp,$filebak))) { $error=1; }
    if (!$error) {
      $request->print("<p><b>Undid changes, Switched $filebak and $file</b></p>");
    } else {
      $request->print("<p><font color=\"red\" size=\"+1\"><b>Unable to undo, unable to switch $filebak and $file</b></font></p>");
      $error=1;
    }
  } else {
    my $fs=Apache::File->new(">$filebak");
    if (defined($fs)) {
      print $fs $$problem;
      $request->print("<b>Making Backup to $filebak</b><br />");
    } else {
      $request->print("<font color=\"red\" size=\"+1\"><b>Unable to make backup $filebak</b></font>");
      $error=2;
    }
    my $fh=Apache::File->new(">$file");
    if (defined($fh)) {
      print $fh $$result;
      $request->print("<b>Saving Modifications to $file</b><br />");
    } else {
      $request->print("<font color=\"red\" size=\"+1\"><b>Unable to write to $file</b></font>");
      $error|=4;
    }
  }
  return $error;
}

sub analyze_header {
    my ($request) = @_;
    my $result.='<html>
            <head><title>Analyzing a problem</title></head>
            <body bgcolor="#FFFFFF">
            <form name="lonhomework" method="POST" action="'.
	      $ENV{'request.uri'}.'">
            <input type="submit" name="problemmode" value="EditXML" />
            <input type="submit" name="problemmode" value="Edit" />
            <hr />
            <input type="submit" name="submit" value="View" />
            <hr />
            List of possible answers:
            </form>';
    $request->print($result);
    $request->rflush();
}

sub analyze_footer {
    my ($request) = @_;
    my $result='</body></html>';
    $request->print($result);
    $request->rflush();
}

sub analyze {
    my ($request,$file) = @_;
    &Apache::lonxml::debug("Analyze");
    my $result;
    my %overall;
    my %allparts;
    my $rndseed=$ENV{'form.rndseed'};
    &analyze_header($request);
    my %prog_state=
	&Apache::lonhtmlcommon::Create_PrgWin($request,'Analyze Progress',
					      'Getting Problem Variants',
					      $ENV{'form.numtoanalyze'});
    for(my $i=1;$i<$ENV{'form.numtoanalyze'}+1;$i++) {
	&Apache::lonhtmlcommon::Increment_PrgWin($request,\%prog_state,
						 'last problem');
	my $subresult=&Apache::lonnet::ssi($request->uri,
					   ('grade_target' => 'analyze'),
					   ('rndseed' => $i+$rndseed));
	(my $garbage,$subresult)=split(/_HASH_REF__/,$subresult,2);
	my %analyze=&Apache::lonnet::str2hash($subresult);
	my @parts;
	if (defined(@{ $analyze{'parts'} })) {
	    @parts=@{ $analyze{'parts'} };
	}
	foreach my $part (@parts) {
	    if (!exists($allparts{$part})) {$allparts{$part}=1;};
	    if ($analyze{$part.'.type'} eq 'numericalresponse'	||
		$analyze{$part.'.type'} eq 'stringresponse'	||
		$analyze{$part.'.type'} eq 'formularesponse'   ) {
		push( @{ $overall{$part.'.answer'} },
		      [@{ $analyze{$part.'.answer'} }]);
	    }
	}
    }
    &Apache::lonhtmlcommon::Update_PrgWin($request,\%prog_state,
					  'Analyzing Results');
    foreach my $part (keys(%allparts)) {
	if (defined(@{ $overall{$part.'.answer'} })) {
	    $request->print('<table><tr><td>Part '.$part.'</td></tr>');
	    my %frequency;
	    foreach my $answer (sort {$a->[0] <=> $b->[0]} (@{ $overall{$part.'.answer'} })) {
		$frequency{join('\0',@{ $answer })}++;
	    }
	    foreach my $answer (sort {(split('\0',$a))[0] <=> (split('\0',$b))[0]} (keys(%frequency))) {
		$request->print('<tr><td>'.
				join('</td><td>',split('\0',$answer)).
				'</td><td>('.$frequency{$answer}.
				')</td></tr>');
	    }
	    $request->print('</table>');
	} else {
	    $request->print('<p>Part '.$part.
			    ' is not analyzable at this time</p>');
	}
    }
    if (scalar(keys(%allparts)) == 0 ) {
	$request->print('<p>Found no analyzable parts in this problem,
                         currently only Numerical, Formula and String response
                         styles are supported.</p>');
    }
    &Apache::lonhtmlcommon::Close_PrgWin($request,\%prog_state);
    &analyze_footer($request);
    &Apache::lonhomework::showhash(%overall);
    return $result;
}

sub editxmlmode {
  my ($request,$file) = @_;
  my $result;
  my $problem=&Apache::lonnet::getfile($file);
  if ($problem eq -1) {
    &Apache::lonxml::error("<b> Unable to find <i>$file</i></b>");
    $problem='';
  }
  if (defined($ENV{'form.editxmltext'}) || defined($ENV{'form.Undo'})) {
    my $error=&handle_save_or_undo($request,\$problem,
				   \$ENV{'form.editxmltext'});
    if (!$error) { $problem=&Apache::lonnet::getfile($file); }
  }
  &Apache::lonhomework::showhashsubset(\%ENV,'^form');
  if ( $ENV{'form.submit'} eq 'Submit Changes and View' ) {
    &Apache::lonhomework::showhashsubset(\%ENV,'^form');
    $ENV{'form.problemmode'}='View';
    &renderpage($request,$file);
  } else {
    my ($rows,$cols) = &Apache::edit::textarea_sizes(\$problem);
    my $xml_help = '<table><tr><td>'.
	&Apache::loncommon::help_open_topic("Problem_Editor_XML_Index",'Problem Editing Help')
	    .'</td><td>'.
	&Apache::loncommon::help_open_topic("Greek_Symbols",'Greek Symbols',
					    undef,undef,600)
	    .'</td><td>'.
        &Apache::loncommon::help_open_topic("Other_Symbols",'Other Symbols',
					    undef,undef,600)
	    .'</td></tr></table>';
    if ($cols > 80) { $cols = 80; }
    if ($cols < 70) { $cols = 70; }
    if ($rows < 20) { $rows = 20; }
    $result.='<html><body bgcolor="#FFFFFF">
            <form name="lonhomework" method="POST" action="'.
	      $ENV{'request.uri'}.'">
            <input type="hidden" name="problemmode" value="EditXML" />
            <input type="submit" name="problemmode" value="Discard Edits and View" />
            <input type="submit" name="problemmode" value="Edit" />
            <hr />
            <input type="submit" name="submit" value="Submit Changes" />
            <input type="submit" name="submit" value="Submit Changes and View" />
            <input type="submit" name="Undo" value="undo" />
            <hr />
            ' . $xml_help . '
            <textarea rows="'.$rows.'" cols="'.$cols.'" name="editxmltext">'.
	      &HTML::Entities::encode($problem).'</textarea>
            </form></body></html>';
    $request->print($result);
  }
  return '';
}

sub renderpage {
  my ($request,$file) = @_;

  my (@targets) = &get_target();
  &Apache::lonxml::debug("Running targets ".join(':',@targets));
  foreach my $target (@targets) {
    #my $t0 = [&gettimeofday()];
    my $problem=&Apache::lonnet::getfile($file);
    if ($problem eq -1) {
      &Apache::lonxml::error("<b> Unable to find <i>$file</i></b>");
      $problem='';
    }

    my %mystyle;
    my $result = '';
    if ($target eq 'analyze') { %Apache::lonhomework::analyze=(); }
    if ($target eq 'answer') { &showhash(%Apache::lonhomework::history); }
    if ($target eq 'web') {&Apache::lonhomework::showhashsubset(\%ENV,'^form');}

    &Apache::lonxml::debug("Should be parsing now");
    $result = &Apache::lonxml::xmlparse($request, $target, $problem,
			&setup_vars($target),%mystyle);
    undef($Apache::lonhomework::parsing_a_problem);
    #$request->print("Result follows:");
    if ($target eq 'modified') {
      &handle_save_or_undo($request,\$problem,\$result);
    } else {
      if ($target eq 'analyze') {
	$result=&Apache::lonnet::hashref2str(\%Apache::lonhomework::analyze);
	undef(%Apache::lonhomework::analyze);
      }
      #my $td=&tv_interval($t0);
      #if ( $Apache::lonxml::debug) {
	#$result =~ s:</body>::;
	#$result.="<br />Spent $td seconds processing target $target\n</body>";
      #}
      $request->print($result);
      $request->rflush();
    }
    #$request->print(":Result ends");
    #my $td=&tv_interval($t0);
  }
}

# with no arg it returns a HTML <option> list of the template titles
# with one arg it returns the filename associated with the arg passed
sub get_template_list {
  my ($namewanted,$extension) = @_;
  my $result;
  my @allnames;
  &Apache::lonxml::debug("Looking for :$extension:");
  foreach my $file (</home/httpd/html/res/adm/includes/templates/*.$extension>) {
    my $name=&Apache::lonnet::metadata($file,'title');
    if ($namewanted && ($name eq $namewanted)) {
      $result=$file;
      last;
    } else {
	if ($name) { push (@allnames, $name); }
    }
  }
  if (@allnames && !$result) {
    $result="<option>Select a $extension template</option>\n<option>".
	join('</option><option>',sort(@allnames)).'</option>';
  }
  return $result;
}

sub newproblem {
    my ($request) = @_;
    my $extension=$request->uri;
    $extension=~s:^.*\.([\w]+)$:$1:;
    &Apache::lonxml::debug("Looking for :$extension:");
    my $templatelist=&get_template_list('',$extension);
    if ($ENV{'form.template'} &&
	$ENV{'form.template'} ne "Select a $extension template") {
	use File::Copy;
	my $file = &get_template_list($ENV{'form.template'},$extension);
	my $dest = &Apache::lonnet::filelocation("",$request->uri);
	copy($file,$dest);
	&renderpage($request,$dest);
    } elsif($ENV{'form.newfile'} && !$templatelist) {
	# I don't like hard-coded filenames but for now, this will work.
	use File::Copy;
	my $templatefilename =
	    $request->dir_config('lonIncludes').'/templates/blank.problem';
	&Apache::lonxml::debug("$templatefilename");
	my $dest = &Apache::lonnet::filelocation("",$request->uri);
	copy($templatefilename,$dest);
	&renderpage($request,$dest);
    } else {
	my $url=$request->uri;
	my $dest = &Apache::lonnet::filelocation("",$request->uri);
	my $errormsg;
	if ($ENV{'form.newfile'}) {
	    $errormsg='<p><font color="red">You did not select a template.</font></p>'."\n";
	}
	my $instructions;
	if ($templatelist) { $instructions=", select a template from the pull-down menu below.<br />Then";}
	$request->print(<<ENDNEWPROBLEM);
<body bgcolor="#FFFFFF">
<h1>Creating a new $extension resource</h1>
$errormsg
The requested file <tt>$url</tt> currently does not exist.
<p>
<b>To create a new $extension$instructions click on the "Create $extension" button.</b>
</p>
<p><form action="$url" method="POST">
ENDNEWPROBLEM
	if (defined($templatelist)) {
	    $request->print("<select name=\"template\">$templatelist</select>");
	}
	$request->print("<br /><input type=\"submit\" name=\"newfile\" value=\"Create $extension\" />");
	$request->print("</form></p></body>");
    }
    return '';
}

sub view_or_edit_menu {
  my ($request) = @_;
  my $url=$request->uri;
  $request->print(<<EDITMENU);
<body bgcolor="#FFFFFF">
<form action="$url" method="POST">
Would you like to <input type="submit" name="problemmode" value="View"> or
<input type="submit" name="problemmode" value="Edit"> the problem.
</form>
</body>
EDITMENU
}

sub handler {
  #my $t0 = [&gettimeofday()];
  my $request=$_[0];

  $Apache::lonxml::debug=$ENV{'user.debug'};

  if (&setupheader($request)) { return OK; }
  $ENV{'request.uri'}=$request->uri;

  #setup permissions
  $Apache::lonhomework::browse= &Apache::lonnet::allowed('bre',$ENV{'request.filename'});
  $Apache::lonhomework::viewgrades=&Apache::lonnet::allowed('vgr',$ENV{'request.course.id'});
  &Apache::lonxml::debug("Permissions:$Apache::lonhomework::browse:$Apache::lonhomework::viewgrades:");
  # some times multiple problemmodes are submitted, need to select
  # the last one
  &Apache::lonxml::debug("Problem Mode ".$ENV{'form.problemmode'});
  if ( defined($ENV{'form.problemmode'}) &&
       ref($ENV{'form.problemmode'}) ) {
    &Apache::lonxml::debug("Problem Mode ".join(",",@$ENV{'form.problemmode'}));
    my $mode=$ENV{'form.problemmode'}->[-1];
    undef $ENV{'form.problemmode'};
    $ENV{'form.problemmode'}=$mode;
  }
  &Apache::lonxml::debug("Problem Mode ".$ENV{'form.problemmode'});
  my $file=&Apache::lonnet::filelocation("",$request->uri);

  #check if we know where we are
  if ($ENV{'request.course.fn'} && !&Apache::lonnet::symbread()) { 
    # if we are browsing we might not be able to know where we are
    if ($Apache::lonhomework::browse ne 'F') {
      #should know where we are, so ask
      $request->internal_redirect('/adm/ambiguous'); return;
    }
  }

  my ($symb) = &Apache::lonxml::whichuser();
  &Apache::lonxml::debug('symb is '.$symb);
  if ($ENV{'request.state'} eq "construct" || $symb eq '') {
      if ($ENV{'form.resetdata'} eq 'Reset Submissions' ||
	  $ENV{'form.resetdata'} eq 'New Problem Variation' ) {
	  my ($symb,$courseid,$domain,$name) = &Apache::lonxml::whichuser();
	  &Apache::lonnet::tmpreset($symb,'',$domain,$name);
      }
  }
  if ($ENV{'request.state'} eq "construct") {
    if ( -e $file ) {
      if (!(defined $ENV{'form.problemmode'})) {
	#first visit to problem in construction space
	#&view_or_edit_menu($request);
	$ENV{'form.problemmode'}='View';
	&renderpage($request,$file);
      } elsif ($ENV{'form.problemmode'} eq 'EditXML') {
	&editxmlmode($request,$file);
      } elsif ($ENV{'form.problemmode'} eq 'Calculate answers') {
	&analyze($request,$file);
      } else {
	&renderpage($request,$file);
      }
    } else {
      # requested file doesn't exist in contruction space
      &newproblem($request);
    }
  } else {
    # just render the page normally outside of construction space
    &Apache::lonxml::debug("not construct");
    &renderpage($request,$file);
  }
  #my $td=&tv_interval($t0);
  #&Apache::lonxml::debug("Spent $td seconds processing");
  # &Apache::lonhomework::send_footer($request);
  # always turn off debug messages
  $Apache::lonxml::debug=0;
  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.