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Diff for /loncom/homework/lonhomework.pm between versions 1.31 and 1.102

version 1.31, 2001/01/11 15:20:58 version 1.102, 2002/11/13 23:05:46
Line 1 Line 1
   # The LearningOnline Network with CAPA
 # The LON-CAPA Homework handler  # The LON-CAPA Homework handler
   #
   # $Id$
   #
   # 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  # Guy Albertelli
 # 11/30 Gerd Kortemeyer  # 11/30 Gerd Kortemeyer
 # 6/1 Gerd Kortemeyer  # 6/1,8/17,8/18 Gerd Kortemeyer
   # 7/18 Jeremy Bowers
   
 package Apache::lonhomework;  package Apache::lonhomework;
 use strict;  use strict;
 use Apache::style;  use Apache::style();
 use Apache::lonxml;  use Apache::lonxml();
 use Apache::lonnet;  use Apache::lonnet();
 use Apache::inputtags;  use Apache::lonplot();
 use Apache::structuretags;  use Apache::inputtags();
 use Apache::response;  use Apache::structuretags();
 use Apache::hint;  use Apache::randomlabel();
 use Apache::outputtags;  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::Constants qw(:common);  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 {  sub get_target {
   if ( $ENV{'request.state'} eq "published") {    if ( $ENV{'request.state'} eq "published") {
     if ( defined $ENV{'form.submit'}) {      if ( defined($ENV{'form.grade_target'}  ) 
    && ($ENV{'form.grade_target'} eq 'tex')) {
         return ($ENV{'form.grade_target'});
       } elsif ( defined($ENV{'form.grade_target'}  ) 
    && ($Apache::lonhomework::viewgrades == 'F' )) {
         return ($ENV{'form.grade_target'});
       }
    
       if ( defined($ENV{'form.submitted'})) {
       return ('grade', 'web');        return ('grade', 'web');
     } else {      } else {
       return ('web');        return ('web');
     }      }
   } elsif ($ENV{'request.state'} eq "construct") {    } elsif ($ENV{'request.state'} eq "construct") {
     if ( defined $ENV{'form.preview'}) {      if ( defined($ENV{'form.grade_target'}) ) {
       if ( defined $ENV{'form.submit'}) {        return ($ENV{'form.grade_target'});
       }
       if ( defined($ENV{'form.preview'})) {
         if ( defined($ENV{'form.submitted'})) {
  return ('grade', 'web');   return ('grade', 'web');
       } else {        } else {
  return ('web');   return ('web');
       }        }
     } else {      } else {
       #return ('edit');        if ( $ENV{'form.problemmode'} eq 'View' ||
       #edit is currently broken     $ENV{'form.problemmode'} eq 'Discard Edits and View') {
       return ('web');   if ( defined($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 ( $ENV{'form.submit'} eq 'Submit Changes and View' ) {
       return ('modified','web','answer');
     } else {
       return ('modified','edit');
     }
    } else {
     return ('edit');
    }
         } else {
    return ('web');
         }
     }      }
   }    }
   return ();    return ();
Line 47  sub setup_vars { Line 118  sub setup_vars {
 sub send_header {  sub send_header {
   my ($request)= @_;    my ($request)= @_;
   $request->print(&Apache::lontexconvert::header());    $request->print(&Apache::lontexconvert::header());
   $ENV{'request.uri'}=$request->uri;  
 #  $request->print('<form name='.$ENV{'form.request.prefix'}.'lonhomework method="POST" action="'.$request->uri.'">');  #  $request->print('<form name='.$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 {  sub send_footer {
   my ($request)= @_;    my ($request)= @_;
 #  $request->print('</form>');  #  $request->print('</form>');
   $request->print(&Apache::lontexconvert::footer());    $request->print(&Apache::lontexconvert::footer());
 }  }
   
 #@Apache::lonhomework::date_status=();  $Apache::lonxml::browse='';
 #@Apache::lonhomework::date_msg=();  
 sub check_date {  # JB, 9/24/2002: Any changes in this function may require a change
   # in lonnavmaps::resource::getDateStatus.
   sub check_access {
   my ($id) = @_;    my ($id) = @_;
   my $date ='';    my $date ='';
   my $status = '';    my $status = '';
Line 69  sub check_date { Line 151  sub check_date {
   my $type;    my $type;
   my $passed;    my $passed;
   &Apache::lonxml::debug("checking for part :$id:");    &Apache::lonxml::debug("checking for part :$id:");
     &Apache::lonxml::debug("time:".time);
   foreach $temp ("opendate","duedate","answerdate") {    foreach $temp ("opendate","duedate","answerdate") {
     $lastdate = $date;      $lastdate = $date;
     $date = &Apache::lonnet::EXT("resource.$id.$temp");      $date = &Apache::lonnet::EXT("resource.$id.$temp");
       my $thistype = &Apache::lonnet::EXT("resource.$id.$temp.type");
       if ($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 :$temp:");      &Apache::lonxml::debug("found :$date: for :$temp:");
     if ($date eq '') {      if ($date eq '') {
       $date = "an unknown date"; $passed = 0;        $date = "an unknown date"; $passed = 0;
Line 95  sub check_date { Line 187  sub check_date {
     $datemsg = "is due at $date";      $datemsg = "is due at $date";
   } elsif ($type eq 'answerdate') {    } elsif ($type eq 'answerdate') {
     $status='CLOSED';      $status='CLOSED';
     $datemsg = "was due as $lastdate, and answers will be available at $date";      $datemsg = "was due on $lastdate, and answers will be available on $date";
   }    }
   if ($status eq 'CAN_ANSWER') {    if ($status eq 'CAN_ANSWER') {
     #check #tries      #check #tries
Line 105  sub check_date { Line 197  sub check_date {
     if ( $maxtries eq '' ) { $maxtries = '2'; }       if ( $maxtries eq '' ) { $maxtries = '2'; } 
     if ($tries >= $maxtries) { $status = 'CANNOT_ANSWER'; }       if ($tries >= $maxtries) { $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:");    &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';
       $datemsg='is closed but you are allowed to view it';
     }
   if ($ENV{'request.state'} eq "construct") {    if ($ENV{'request.state'} eq "construct") {
     &Apache::lonxml::debug("in construction ignoring dates");      &Apache::lonxml::debug("in construction ignoring dates");
     $status='CAN_ANSWER';      $status='CAN_ANSWER';
Line 114  sub check_date { Line 218  sub check_date {
   return ($status,$datemsg);    return ($status,$datemsg);
 }  }
   
 sub handler {  sub showhash {
   my $request=$_[0];    my (%hash) = @_;
     &showhashsubset(\%hash,'.');
     return '';
   }
   
   if ( $ENV{'user.name'} eq 'albertel' ) { $Apache::lonxml::debug=1; }  sub showhashsubset {
       my ($hash,$keyre) = @_;
   my (@targets) = &get_target();    my $resultkey;
     foreach $resultkey (sort keys %$hash) {
       if ($resultkey =~ /$keyre/) {
         if (ref($$hash{$resultkey})) {
    if ($$hash{$resultkey} =~ /ARRAY/ ) {
     my $string="$resultkey ---- (";
     foreach my $elm (@{ $$hash{$resultkey} }) {
       $string.="$elm,";
     }
     chop($string);
     &Apache::lonxml::debug("$string)");
    } else {
     &Apache::lonxml::debug("$resultkey ---- $$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'});
     $Apache::lonhomework::viewgrades=&Apache::lonnet::allowed('vgr',$ENV{'request.course.id'});
     return ''
   }
   
   sub setupheader {
     my $request=$_[0];
   if ($ENV{'browser.mathml'}) {    if ($ENV{'browser.mathml'}) {
     $request->content_type('text/xml');      $request->content_type('text/xml');
   } else {    } else {
     $request->content_type('text/html');      $request->content_type('text/html');
   }    }
     if (!$Apache::lonxml::debug && ($ENV{'REQUEST_METHOD'} eq 'GET')) {
       &Apache::loncommon::no_cache($request);
     }
   $request->send_http_header;    $request->send_http_header;
   return OK if $request->header_only;    return OK if $request->header_only;
       return ''
   &Apache::lonhomework::send_header($request);  }
     
   #check if allowed to see  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><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 {
       my ($request,$file) = @_;
       &Apache::lonxml::debug("Analyze");
       my $result;
       my %overall;
       my %allparts;
       my $rndseed=$ENV{'form.rndseed'};
       &analyze_header($request);
       for(my $i=1;$i<$ENV{'form.numtoanalyze'}+1;$i++) {
    my $subresult=&Apache::lonnet::ssi($request->uri,
      ('grade_target' => 'analyze'),
      ('rndseed' => $i));
    &Apache::lonxml::debug(":$subresult:");
    (my $garbage,$subresult)=split(/_HASH_REF__/,$subresult,2);
    my %analyze=&Apache::lonnet::str2hash($subresult);
    &Apache::lonhomework::showhash(%analyze);
    my @parts = @{ $analyze{'parts'} };
    foreach my $part (@parts) {
       if (!exists($allparts{$part})) {$allparts{$part}=1;};
       if ($analyze{$part.'.type'} eq 'numericalresponse') {
    push( @{ $overall{$part.'.answer'} },
         [@{ $analyze{$part.'.answer'} }]);
       }
    }
       }
       foreach my $part (keys(%allparts)) {
    $request->print('<table><tr><td>Part '.$part.'</td></tr>');
    foreach my $answer (sort {$a->[0] <=> $b->[0]} (@{ $overall{$part.'.answer'} })) {
       $request->print('<tr><td>'.join('</td><td>',@{ $answer }).
       '</td></tr>');
    }
       }
       &Apache::lonhomework::showhash(%overall);
       return $result;
   }
   
   sub editxmlmode {
     my ($request,$file) = @_;
     my $result;
     my $problem=&Apache::lonnet::getfile($file);
     if ($problem == -1) {
       &Apache::lonxml::error("<b> Unable to find <i>$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 $xml_help = Apache::loncommon::help_open_topic("Problem_Editor_XML_Index");
       if ($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 />
               ' . $xml_help . ' Problem Help<br>
               <textarea rows="'.$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) {    foreach my $target (@targets) {
     my $file=&Apache::lonnet::filelocation("",$request->uri);      #my $t0 = [&gettimeofday()];
     my $problem=&Apache::lonnet::getfile($file);      my $problem=&Apache::lonnet::getfile($file);
     if ($problem == -1) {      if ($problem == -1) {
       &Apache::lonxml::error("<b> Unable to find <i>$file</i></b>");        &Apache::lonxml::error("<b> Unable to find <i>$file</i></b>");
       $problem='';        $problem='';
     }      }
       
     my %mystyle;      my %mystyle;
     my $result = '';      my $result = '';
     &Apache::inputtags::initialize_inputtags;      &Apache::inputtags::initialize_inputtags();
     %Apache::lonhomework::results=();      &Apache::outputtags::initialize_outputtags();
     %Apache::lonhomework::history=&Apache::lonnet::restore;      &Apache::edit::initialize_edit();
     #ignore error conditions      if ($target eq 'analyze') { %Apache::lonhomework::anaylze=(); }
     my ($temp)=keys %Apache::lonhomework::history ;      if ($target eq 'answer') { &showhash(%Apache::lonhomework::history); }
     if ($temp =~ m/^error:.*/) { %Apache::lonhomework::history=(); }       if ($target eq 'web') {&Apache::lonhomework::showhashsubset(\%ENV,'^form');}
     if ($target eq 'web' && &Apache::lonnet::symbread() eq '') {  
       $request->print("Vieiwing this problem as not a student, submissions will be ignored.");      &Apache::lonxml::debug("Should be parsing now");
     }      $result = &Apache::lonxml::xmlparse($request, $target, $problem,
     if ($target eq 'grade') {   &setup_vars($target),%mystyle);
       my $resultkey;  
       foreach $resultkey (sort keys %Apache::lonhomework::history) {      #$request->print("Result follows:");
  &Apache::lonxml::debug("$resultkey ---- $Apache::lonhomework::history{$resultkey}");      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);
       }        }
       &Apache::lonxml::debug("\n<br>restored values^</br>\n");        #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);
     }      }
     my $default=&Apache::lonnet::getfile('/home/httpd/html/res/adm/includes/default_homework.lcpm');      #$request->print(":Result ends");
     if ($default == -1) {      #my $td=&tv_interval($t0);
       &Apache::lonxml::error("<b>Unable to find <i>default_homework.lcpm</i></b>");    }
       $default='';  }
   
   # 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 {
         push (@allnames, $name);
     }      }
     $result = &Apache::lonxml::xmlparse($target, $problem,    }
  $default.&setup_vars($target),%mystyle);    if (@allnames && !$result) {
       $result="<option>Select a $extension type</option>\n<option>".
         join('</option><option>',sort(@allnames)).'</option>';
     }
     return $result;
   }
   
     #$request->print("Result follows:");  sub newproblem {
     $request->print($result);      my ($request) = @_;
     #$request->print(":Result ends");      my $extension=$request->uri;
     if ($target eq 'grade') {      $extension=~s:^.*\.([\w]+)$:$1:;
       &Apache::lonxml::debug("Looking for :$extension:");
       if ($ENV{'form.template'} &&
    $ENV{'form.template'} ne "Select a $extension type") {
    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'}) {
    # 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 $templatelist=&get_template_list('',$extension);
    my $url=$request->uri;
    my $dest = &Apache::lonnet::filelocation("",$request->uri);
    my $instructions;
    if ($templatelist) { $instructions=", select a template from the pull-down menu below. Then";}
    $request->print(<<ENDNEWPROBLEM);
   <body bgcolor="#FFFFFF">
   The requested file $url doesn\'t exist. <br />
   To create a new $extension$instructions click on the Create $extension button.
   <form action="$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></body>");
       }
       return '';
   }
   
       my $resultkey;  sub view_or_edit_menu {
       foreach $resultkey (sort keys %Apache::lonhomework::results) {    my ($request) = @_;
  &Apache::lonxml::debug("$resultkey ---- $Apache::lonhomework::results{$resultkey}");    my $url=$request->uri;
       }    $request->print(<<EDITMENU);
       &Apache::lonxml::debug("\n<br>storing values^</br>\n");  <body bgcolor="#FFFFFF">
   <form action="$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];
   
   #  if ( $ENV{'user.name'} eq 'albertel' ) {$Apache::lonxml::debug=1;}
     $Apache::lonxml::debug=$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;
       }
     }
   
     if ($ENV{'request.state'} eq "construct") {
       if ($ENV{'form.resetdata'} eq 'Reset Submissions') {
         my ($symb,$courseid,$domain,$name) = &Apache::lonxml::whichuser();
         &Apache::lonnet::tmpreset($symb,'',$domain,$name);
     }      }
           if ( -e $file ) {
     my ($temp) = keys %Apache::lonhomework::results;        if (!(defined $ENV{'form.problemmode'})) {
     if ( $temp ne '' ) {   #first visit to problem in construction space
       &Apache::lonxml::debug("Store return message:".&Apache::lonnet::cstore(%Apache::lonhomework::results));   #&view_or_edit_menu($request);
    $ENV{'form.problemmode'}='View';
    &renderpage($request,$file);
         } elsif ($ENV{'form.problemmode'} eq 'EditXML') {
    &editxmlmode($request,$file);
         } elsif ($ENV{'form.problemmode'} eq 'Answer Distribution') {
    &analyze($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);
   }    }
   &Apache::lonhomework::send_footer($request);    #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;    return OK;
   
 }  }
Removed from v.1.31  
changed lines
  Added in v.1.102

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