--- loncom/interface/coursecatalog.pm	2008/01/12 22:32:04	1.25
+++ loncom/interface/coursecatalog.pm	2008/05/29 19:58:32	1.30
@@ -1,7 +1,7 @@
 # The LearningOnline Network with CAPA
 # Handler for displaying the course catalog interface
 #
-# $Id: coursecatalog.pm,v 1.25 2008/01/12 22:32:04 raeburn Exp $
+# $Id: coursecatalog.pm,v 1.30 2008/05/29 19:58:32 raeburn Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -54,7 +54,8 @@ sub handler {
     &Apache::lonacc::get_posted_cgi($r);
     &Apache::lonlocal::get_language_handle($r);
     &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},['sortby']);
-    my $codedom = &Apache::lonnet::default_login_domain(); 
+
+    my $codedom = &Apache::lonnet::default_login_domain();
 
     if (($env{'user.domain'} ne '') && ($env{'user.domain'} ne 'public')) { 
         $codedom = $env{'user.domain'};
@@ -63,15 +64,40 @@ sub handler {
         }
     }
     my $formname = 'coursecatalog';
+    if ($env{'form.showdom'} ne '') {
+        if (&Apache::lonnet::domain($env{'form.showdom'}) ne '') {
+            $codedom = $env{'form.showdom'};
+        }
+    }
     my $domdesc = &Apache::lonnet::domain($codedom,'description');
-
     &Apache::lonhtmlcommon::clear_breadcrumbs();
     if ($env{'form.coursenum'} ne '' && &user_is_known()) {
         &course_details($r,$codedom,$formname,$domdesc);
     } else {
-        my $numtitles = &course_selector($r,$codedom,$formname,$domdesc);
-        if ($env{'form.state'} eq 'listing') {
-            $r->print(&print_course_listing($codedom,$numtitles).'<br />');
+        my $catlinks = &category_breadcrumbs($codedom);
+        my $catjs = <<"ENDSCRIPT";
+
+function setCatDepth(depth) {
+    document.coursecats.catalog_maxdepth.value = depth;
+    document.coursecats.submit();
+    return;
+}
+
+ENDSCRIPT
+        my $numtitles;
+        if ($env{'form.currcat_0'} eq 'instcode::0') {
+            $numtitles = &instcode_course_selector($r,$codedom,$formname,$domdesc,
+                                                   $catlinks,$catjs);
+            if ($env{'form.state'} eq 'listing') {
+                $r->print(&print_course_listing($codedom,$numtitles));
+            }
+        } else {
+            my (%add_entries);
+            $catjs = '<script type="text/javascript">'."\n".$catjs."\n".'</script>';
+            &cat_header($r,$codedom,$catjs,\%add_entries,$catlinks);
+            if ($env{'form.currcat_0'} ne '') {
+                $r->print(&print_course_listing($codedom));
+            }
         }
     }
     $r->print(&Apache::loncommon::end_page());
@@ -100,7 +126,7 @@ sub course_details {
              {text=>"Course details"});
     $r->print(&Apache::lonhtmlcommon::breadcrumbs('Course Details'));
     $r->print('<br />'.&mt('Detailed course information:').'<br /><br />'.
-              '<form name="coursecatalog" method="post">'.
+              '<form name="'.$formname.'" method="post">'.
               &print_course_listing($codedom).'<br /><br />');
     $r->print('<a href = "javascript:document.coursecatalog.submit()">'.
               &mt('Back to course listing').'</a>'.
@@ -109,8 +135,8 @@ sub course_details {
               '<input type="hidden" name="state" value="listing" /></form>');
 }
 
-sub course_selector {
-    my ($r,$codedom,$formname,$domdesc) = @_;
+sub instcode_course_selector {
+    my ($r,$codedom,$formname,$domdesc,$catlinks,$catjs) = @_;
     my %coursecodes = ();
     my %codes = ();
     my @codetitles = ();
@@ -128,6 +154,9 @@ sub course_selector {
     my $totcodes = 0;
     my $jscript = '';
     my ($numtitles,$lasttitle);
+    my %add_entries = (topmargin    => "0",
+                       marginheight => "0",);
+    my $js;
     $totcodes = &Apache::courseclassifier::retrieve_instcodes(\%coursecodes,$codedom);
     if ($totcodes > 0) {
         $format_reply = &Apache::lonnet::auto_instcode_format($caller,$codedom,\%coursecodes,\%codes,\@codetitles,\%cat_titles,\%cat_order);
@@ -195,44 +224,25 @@ function setCourseId(caller) {
 }\n|;
             }
         }
-        my $js = '<script type"text/javascript">'."\n$jscript\n".
-                 '</script>';
-        my %add_entries = (topmargin    => "0",
-                           marginheight => "0",);
+        $js = '<script type"text/javascript">'."\n$jscript\n$catjs\n".
+              '</script>';
         if (($env{'form.state'} eq 'listing') && ($numtitles > 0)) {
             $add_entries{'onLoad'} = 'setElements()';
         }
-        my $start_page =
-            &Apache::loncommon::start_page('Course Catalog',$js,
-                                           {
-                                             'add_entries' => \%add_entries,
-                                             'no_inline_link'   => 1,});
-        $r->print($start_page);
-        if ($env{'form.state'} eq 'listing') {
-            if ($numtitles > 0) {
-                &Apache::lonhtmlcommon::add_breadcrumb
-                ({href=>"/adm/coursecatalog",
-                  text=>"Select courses"},
-                 {text=>"Course listing"});
-            } else {
-                &Apache::lonhtmlcommon::add_breadcrumb
-                ({text=>"Course listing"});
-            }
-            $r->print(&Apache::lonhtmlcommon::breadcrumbs('Course Listing'));
-        } else {
-            &Apache::lonhtmlcommon::add_breadcrumb
-            ({href=>"/adm/coursecatalog",
-              text=>"Select courses"});
-            $r->print(&Apache::lonhtmlcommon::breadcrumbs('Select courses'));
-        }
-        $r->print('<h3>'.&mt('Display information about official [_1] classes for which LON-CAPA courses have been created:',$domdesc).'</h3>');
-        $r->print('<form name="coursecatalog" method="post">');
+        &cat_header($r,$codedom,$js,\%add_entries,$catlinks,$numtitles);
+        my $cat_maxdepth = $env{'form.catalog_maxdepth'};
+        $r->print('<form name="'.$formname.'" method="post" action="/adm/coursecatalog">'.
+                  '<input type="hidden" name="catalog_maxdepth" value="'.$cat_maxdepth.'" />'.
+                  '<input type="hidden" name="showdom" value="'.$env{'form.showdom'}.'" />'.
+                  '<input type="hidden" name="currcat_0" value="instcode::0" />');
         if ($numtitles > 0) {
-            $r->print(&mt('<b>Choose which course(s) to list.</b><br />'));
+            $r->print('<br /><b>'.&mt('Choose which course(s) to list.').'</b><br />');
             $r->print('<table><tr>');
             for (my $k=0; $k<$lasttitle-1; $k++) {
-                my @unsorted = @{$cat_items{$codetitles[$k]}};
-                my @items;
+                my (@items,@unsorted);
+                if (ref($cat_items{$codetitles[$k]}) eq 'ARRAY') {
+                    @unsorted = @{$cat_items{$codetitles[$k]}};
+                }
                 &Apache::courseclassifier::sort_cats($k,\%cat_order,\@codetitles,\@unsorted,\@items);
                 my @longitems;
                 if (defined($cat_titles{$codetitles[$k]})) {
@@ -259,12 +269,18 @@ function setCourseId(caller) {
                       '</option>'."\n".'</select>'."\n".
                  '</td>'
                 );
+            my $show_selfenroll_status;
+            if ($env{'form.showselfenroll'}) {
+                $show_selfenroll_status = 'checked="checked" ';
+            }
             if (&user_is_dc($codedom)) {
                 my $showdetails_status;
                 if ($env{'form.showdetails'}) {
                     $showdetails_status = 'checked="checked" ';
-                } 
-                $r->print('<td></td><td><input type="checkbox" name="showdetails" value="1" '.$showdetails_status.'/>'.&mt('Show full details for each course (DC only)').'</td>');
+                }
+                $r->print('<td></td><td><label><input type="checkbox" name="showdetails" value="1" '.$showdetails_status.'/>'.&mt('Show full details for each course (DC only)').'</label><br /><label><input type="checkbox" name="showselfenroll" value="1" '.$show_selfenroll_status.'/>'.&mt('Only show courses which allow self-enrollment').'</label></td>');
+            } else {
+                $r->print('<td></td><td><br /><label><input type="checkbox" name="showselfenroll" value="1" '.$show_selfenroll_status.'/>'.&mt('Only show courses which allow self-enrollment').'</label></td>');
             }
             $r->print('</tr></table>');
             if ($numtitles > 4) {
@@ -273,24 +289,163 @@ function setCourseId(caller) {
             }
             $r->print('<br />');
         }
-        $r->print('<input type="hidden" name="coursenum" value="" /><input type="hidden" name="sortby" value="" /><input type="hidden" name="state" value="listing" />');
+        $r->print('<input type="hidden" name="coursenum" value="" /><input type="hidden" name="sortby" value="" /><input type="hidden" name="state" value="listing" /><input type="hidden" name="form.currcat_0" value="instcode::0" />');
         if ($numtitles > 0) {
             $r->print('<input type="submit" name="catalogfilter" value="'.&mt('Display courses').'" />');
         }
         $r->print('<input type="hidden" name="numtitles" value="'.
                   $numtitles.'" /></form>');
         if (($numtitles > 0) && ($env{'form.state'} eq 'listing')) {
-            $r->print('<br /><br />');
+            $r->print('<br />');
         }
     } else {
-        $r->print(&Apache::loncommon::start_page('Course Catalog','',
-                  {
-                   'no_inline_link'   => 1,}));
-        $r->print('<br />'.&mt('No official courses to display for [_1].',$domdesc));
+        &cat_header($r,$codedom,$js,\%add_entries,$catlinks,$numtitles);
+        my $cat_maxdepth = $env{'form.catalog_maxdepth'};
+        $r->print('<form name="'.$formname.'" method="post" action="/adm/coursecatalog">'.
+                  '<input type="hidden" name="catalog_maxdepth" value="'.$cat_maxdepth.'" />'.
+                  '<input type="hidden" name="showdom" value="'.$env{'form.showdom'}.'" />'.
+                  '<input type="hidden" name="currcat_0" value="instcode::0" />');
+        $r->print('<br />'.&mt('No official courses to display for [_1].',$domdesc).'</form>');
     }
     return $numtitles;
 }
 
+sub cat_header {
+    my ($r,$codedom,$js,$add_entries,$catlinks,$numtitles) = @_;
+    my $start_page =
+        &Apache::loncommon::start_page('Course Catalog',$js,
+                                       {
+                                         'add_entries' => $add_entries,
+                                         'no_inline_link'   => 1,});
+    $r->print($start_page);
+    if ($env{'form.state'} eq 'listing') {
+        if ($numtitles > 0) {
+            &Apache::lonhtmlcommon::add_breadcrumb
+                ({href=>"/adm/coursecatalog",
+                  text=>"Select courses"},
+                 {text=>"Course listing"});
+        } else {
+            &Apache::lonhtmlcommon::add_breadcrumb
+            ({text=>"Course listing"});
+        }
+        $r->print(&Apache::lonhtmlcommon::breadcrumbs('Course Listing'));
+    } else {
+        &Apache::lonhtmlcommon::add_breadcrumb
+        ({href=>"/adm/coursecatalog",
+          text=>"Select courses"});
+        $r->print(&Apache::lonhtmlcommon::breadcrumbs('Select courses'));
+    }
+    $r->print('<table border="0"><tr>'.
+              '<form name="coursecatdom" method="post" action="/adm/coursecatalog">'.
+              '<td><b>'.&mt('Domain:').'</b></td><td>'.
+              &Apache::loncommon::select_dom_form($codedom,'showdom','',1).
+	      '&nbsp;<input type="submit" name="godom" value="Go"></td></form></tr><tr>'.
+	      '<form name="coursecats" method="post" action="/adm/coursecatalog">'.
+              $catlinks.'</form></tr></table>');
+    return;
+}
+
+sub category_breadcrumbs {
+    my ($dom) = @_;
+    my %domconfig =
+        &Apache::lonnet::get_dom('configuration',['coursecategories'],$dom);
+    my (@cats,@trails,%allitems,%idx,@jsarray);
+    &Apache::loncommon::extract_categories($domconfig{'coursecategories'},\@cats,\@trails,
+                                           \%allitems,\%idx,\@jsarray);
+    my $currdepth = 0;
+    my $deeper = 0;
+    my $currcat_str;
+    if ($env{'form.catalog_maxdepth'} ne '') {
+        $currdepth = $env{'form.catalog_maxdepth'};
+        if ($env{'form.currcat_'.$currdepth} eq '') {
+            $deeper = $currdepth;
+        } else {
+            $deeper = $currdepth + 1;
+        }
+    }
+    $currcat_str = '<input type="hidden" name="catalog_maxdepth" value="'.$deeper.'" /><input type="hidden" name="showdom" value="'.$dom.'" />';
+    my $catlinks = '<td valign="top"><b>'.&mt('Catalog:').'</b></td><td><table><tr>';
+    for (my $i=0; $i<$deeper; $i++) {
+        $currcat_str .= '<input type="hidden" name="currcat_'.$i.'" value="'.$env{'form.currcat_'.$i}.'" />';
+        my ($cattitle,$shallower);
+        if ($i == 0) {
+            $cattitle = &mt('Main Categories');
+        } else {
+            $shallower = $i-1;
+            my ($cat,$container,$depth) = map { &unescape($_); } split(/:/,$env{'form.currcat_'.$shallower});
+            $cattitle = $cat;
+        }
+        $catlinks .= '<td valign="top"><a href="javascript:setCatDepth('."'$shallower'".')">'.$cattitle.'</a>-&gt;</td>';
+    }
+    if ($deeper == 0) {
+        $catlinks .= '<td>'.&mt('Main Categories').':&nbsp;';
+        if (ref($cats[0]) eq 'ARRAY') {
+            if ((@{$cats[0]} == 1) && ($cats[0][0] eq 'instcode')) {
+                $catlinks .= &mt('Official courses (with institutional codes)').
+                             '<input type="hidden" name="currcat_0" value="instcode::0">';
+                $env{'form.currcat_0'} = 'instcode::0';
+            } else {
+                $catlinks .= '<select name="currcat_0">'."\n";
+                if (@{$cats[0]} > 1) {
+                    my $selstr;
+                    if ($env{'form.currcat_0'} eq '') {
+                        $selstr = ' selected="selected" ';
+                    }
+                    $catlinks .= '<option value=""'.$selstr.'>'.&mt('Select').'</option>'."\n";
+                }
+                for (my $i=0; $i<@{$cats[0]}; $i++) {
+                    my $name = $cats[0][$i];
+                    my $item = &escape($name).'::0';
+                    my $selstr;
+                    if ($env{'form.currcat_'.$i} eq $item) {
+                        $selstr = ' selected="selected" ';
+                    }
+                    $catlinks .= '<option value="'.$item.'"'.$selstr.'>';
+                    if ($name eq 'instcode') {
+                        $catlinks .= &mt('Official courses (with institutional codes)');
+                    } else {
+                        $catlinks .= $name;
+                    }
+                    $catlinks .= '</option>'."\n";
+                }
+                $catlinks .= '</select>'."\n".
+                             '&nbsp;<input type="submit" name="gocats" value="Go" />';
+            }
+        } else {
+            $catlinks .= &mt('Official courses (with institutional codes)').
+                         '<input type="hidden" name="currcat_0" value="instcode::0">';
+            $env{'form.currcat_0'} = 'instcode::0';
+        }
+    } else {
+        my ($cat,$container,$depth);
+        if ($env{'form.currcat_'.$currdepth} eq '') {
+            my $shallower = $currdepth - 1;
+            ($cat,$container,$depth) = map { &unescape($_); } split(/:/,$env{'form.currcat_'.$shallower});
+        } else {
+            ($cat,$container,$depth) = map { &unescape($_); } split(/:/,$env{'form.currcat_'.$currdepth});
+        }
+        my $deeper = $depth +1;
+        my $currcat = $cat;
+        if ($cat eq 'instcode') {
+            $currcat = &mt('Official courses (with institutional codes)');
+        }
+        $catlinks .= '<td>'.$currcat;
+        if (ref($cats[$deeper]{$cat}) eq 'ARRAY') {
+            $catlinks .= ':&nbsp;<select name="currcat_'.$deeper.'">'.
+                         '<option value="" selected="selected">'.&mt('Select').'</option>';
+            for (my $k=0; $k<@{$cats[$deeper]{$cat}}; $k++) {
+                my $name = $cats[$deeper]{$cat}[$k];
+                my $item = &escape($name).':'.&escape($cat).':'.$deeper;
+                $catlinks .= '<option value="'.$item.'">'.$name.'</option>'."\n";
+            }
+            $catlinks .= '</select>'."\n".
+                         '&nbsp;<input type="submit" name="gocats" value="Go" />';
+        }
+    }
+    $catlinks .= $currcat_str.'</td></tr></table></td>';
+    return $catlinks;
+}
+
 sub user_is_dc {
     my ($codedom) = @_;
     if (exists($env{'user.role.dc./'.$codedom.'/'})) {
@@ -387,7 +542,7 @@ sub build_javascript {
     return $output;
 }
 
-sub search_courselist {
+sub search_official_courselist {
     my ($domain,$numtitles) = @_;
     my $instcode;
     if (defined($numtitles) && $numtitles == 0) {
@@ -412,10 +567,27 @@ sub search_courselist {
         }
     }
     my %courses = &Apache::lonnet::courseiddump($domain,'.',1,$instcode,'.','.',
-                                                undef,undef,'Course',1);
+                                                undef,undef,'Course',1,
+                                                $env{'form.showselfenroll'});
     return %courses;
 }
 
+sub search_courselist {
+    my ($domain) = @_;
+    my $cat_maxdepth = $env{'form.catalog_maxdepth'};
+    my $filter = $env{'form.currcat_'.$cat_maxdepth};
+    if (($filter eq '') && ($cat_maxdepth > 0)) {
+        my $shallower = $cat_maxdepth - 1;
+        $filter = $env{'form.currcat_'.$shallower};
+    }
+    my %courses;
+    if ($filter ne '') {
+        %courses = &Apache::lonnet::courseiddump($domain,'.',1,'.','.','.',
+                                                 undef,undef,'Course',1,
+                                                 $env{'form.showselfenroll'},$filter);
+    }
+    return %courses;
+}
 
 sub print_course_listing {
     my ($domain,$numtitles) = @_;
@@ -437,7 +609,11 @@ sub print_course_listing {
             return $output;
         }
     } else {
-        %courses = &search_courselist($domain,$numtitles);
+        if ($env{'form.currcat_0'} eq 'instcode::0') {
+            %courses = &search_official_courselist($domain,$numtitles);
+        } else {
+            %courses = &search_courselist($domain);
+        }
         if (keys(%courses) == 0) {
             $output = &mt('No courses match the criteria you selected.');
             return $output;
@@ -446,13 +622,16 @@ sub print_course_listing {
             $output = &mt('<b>Note for students:</b> If you are officially enrolled in a course but the course is not listed in your LON-CAPA courses, click the "Show more details" link for the specific course and check the default access dates and/or automated enrollment settings.<br /><br />');
         }
     }
-    $output .= &construct_data_table($knownuser,\%courses,$details);
+    my $now = time;
+    my %domconfig =
+        &Apache::lonnet::get_dom('configuration',['usercreation'],$domain);
+    $output .= &construct_data_table($knownuser,\%courses,$details,undef,$now,\%domconfig);
     $output .= &Apache::lonhtmlcommon::echo_form_input(['coursenum','state','catalogfilter','sortby','showdetails']);
     return $output;
 }
 
 sub construct_data_table {
-    my ($knownuser,$courses,$details,$usersections) = @_;
+    my ($knownuser,$courses,$details,$usersections,$now,$domconfig) = @_;
     my %sortname;
     if (($details eq '') || ($env{'form.showdetails'})) {
         $sortname{'Code'} = 'code';
@@ -483,9 +662,10 @@ sub construct_data_table {
               '<th>'.&mt('Student Counts').'</th>'.
               '<th>'.&mt('Auto-enrollment of <br />registered students').'</th>';
         } else {
-            $output .= '<th>&nbsp;</th>';
+            $output .= '<th>'.&mt('Details').'</th>';
         }
     }
+    $output .= '<th>'.&mt('Self-enroll (if permitted)').'</th>';
     &Apache::loncommon::end_data_table_header_row();
     my %courseinfo = &build_courseinfo_hash($courses,$knownuser,$details,
                                             $usersections);
@@ -514,7 +694,8 @@ sub construct_data_table {
     foreach my $item (@sorted_courses) {
         foreach my $course (@{$Sortby{$item}}) {
             $output.=&Apache::loncommon::start_data_table_row(); 
-            $output.=&courseinfo_row($courseinfo{$course},$knownuser,$details,\$count);
+            $output.=&courseinfo_row($courseinfo{$course},$knownuser,
+                                     $details,\$count,$now,$course);
             $output.=&Apache::loncommon::end_data_table_row();
         }
     }
@@ -535,12 +716,16 @@ sub build_courseinfo_hash {
         $cleandesc=~s/'/\\'/g;
         $cleandesc =~ s/^\s+//;
         my ($cdom,$cnum)=split(/\_/,$course);
-        my ($descr,$instcode,$singleowner,$ttype,@owners,%ownernames);
+        my ($descr,$instcode,$singleowner,$ttype,$selfenroll_types,
+            $selfenroll_start,$selfenroll_end,@owners,%ownernames);
         if (ref($courses->{$course}) eq 'HASH') {
             $descr = $courses->{$course}{'description'};
             $instcode =  $courses->{$course}{'inst_code'};
             $singleowner = $courses->{$course}{'owner'};
             $ttype =  $courses->{$course}{'type'};
+            $selfenroll_types = $courses->{$course}{'selfenroll_types'};
+            $selfenroll_start = $courses->{$course}{'selfenroll_start_date'};
+            $selfenroll_end = $courses->{$course}{'selfenroll_end_date'};
             push(@owners,$singleowner);
             if (ref($courses->{$course}{'co-owners'}) eq 'ARRAY') {
                 foreach my $item (@{$courses->{$course}{'co-owners'}}) {
@@ -575,6 +760,9 @@ sub build_courseinfo_hash {
         $courseinfo{$course}{'ownerlastnames'} = join(', ',sort(@lastnames));
         $courseinfo{$course}{'title'} = $cleandesc;
         $courseinfo{$course}{'owner'} = $singleowner;
+        $courseinfo{$course}{'selfenroll_types'} = $selfenroll_types;
+        $courseinfo{$course}{'selfenroll_start'} = $selfenroll_start;
+        $courseinfo{$course}{'selfenroll_end'} = $selfenroll_end;
 
         my %coursehash = &Apache::lonnet::dump('environment',$cdom,$cnum);
         my @classids;
@@ -658,7 +846,7 @@ sub count_students {
 }
 
 sub courseinfo_row {
-    my ($info,$knownuser,$details,$countref) = @_;
+    my ($info,$knownuser,$details,$countref,$now,$course) = @_;
     my ($cdom,$cnum,$title,$ownerlast,$code,$owner,$seclist,$xlist_items,
         $accessdates,$showsyllabus,$counts,$autoenrollment,$output);
     if (ref($info) eq 'HASH') {
@@ -701,6 +889,22 @@ sub courseinfo_row {
             $output .= "<td><a href=\"javascript:setCourseId('$cnum')\">".&mt('Show more details').'</a></td>';
         }
     }
+    my $selfenroll;
+    if ($info->{'selfenroll_types'}) {
+        my $showstart = &Apache::lonlocal::locallocaltime($info->{'selfenroll_start'});
+        my $showend = &Apache::lonlocal::locallocaltime($info->{'selfenroll_end'});
+        if (($info->{'selfenroll_end'} > 0) && ($info->{'selfenroll_end'} > $now)) {
+            if (($info->{'selfenroll_start'} > 0) && ($info->{'selfenroll_start'} > $now)) {
+                $output .= '<td>'.&mt('Starts: [_1]','<span class="LC_cusr_emph">'.$showstart.'</span>').'<br />'.&mt('Ends: [_1]','<span class="LC_cusr_emph">'.$showend.'</span>').'</td>';
+            } else { 
+                $output .= '<td><a href="/adm/selfenroll?cid='.$course.'">'.&mt('Enroll in course').'</a></td>';
+            }
+            $selfenroll = 1;
+        }
+    }
+    if (!$selfenroll) {
+        $output .= '<td>&nbsp;</td>';
+    }
     $$countref ++;
     return $output;
 }