--- loncom/interface/statistics/lonstathelpers.pm	2004/03/16 16:30:31	1.8
+++ loncom/interface/statistics/lonstathelpers.pm	2004/04/01 22:13:39	1.11
@@ -1,6 +1,6 @@
 # The LearningOnline Network with CAPA
 #
-# $Id: lonstathelpers.pm,v 1.8 2004/03/16 16:30:31 matthew Exp $
+# $Id: lonstathelpers.pm,v 1.11 2004/04/01 22:13:39 matthew Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -345,6 +345,60 @@ sub get_prev_curr_next {
 
 =pod
 
+=item GetStudentAnswers($r,$problem,$Students)
+
+Determines the correct answer for a set of students on a given problem.
+The students answers are stored in the student hashes pointed to by the
+array @$Students under the key 'answer'.
+
+Inputs: $r
+$problem: hash reference containing the keys 'resource', 'part', and 'respid'.
+$Students: reference to array containing student hashes (need 'username', 
+    'domain').  
+
+Returns: nothing 
+
+=cut
+
+#####################################################
+#####################################################
+sub GetStudentAnswers {
+    my ($r,$problem,$Students) = @_;
+    my $c = $r->connection();
+    my %Answers;
+    my ($resource,$partid,$respid) = ($problem->{'resource'},
+                                      $problem->{'part'},
+                                      $problem->{'respid'});
+    # Read in the cache (if it exists) before we start timing things.
+    &Apache::lonstathelpers::ensure_proper_cache($resource->{'symb'});
+    # Open progress window
+    my %prog_state=&Apache::lonhtmlcommon::Create_PrgWin
+        ($r,'Student Answer Compilation Status',
+         'Student Answer Compilation Progress', scalar(@$Students));
+    $r->rflush();
+    foreach my $student (@$Students) {
+        last if ($c->aborted());
+        my $sname = $student->{'username'};
+        my $sdom = $student->{'domain'};
+        my $answer = &Apache::lonstathelpers::analyze_problem_as_student
+            ($resource,$sname,$sdom,$partid,$respid);
+        &Apache::lonhtmlcommon::Increment_PrgWin($r,\%prog_state,
+                                                 &mt('last student'));
+        $student->{'answer'} = $answer;
+    }
+    &Apache::lonstathelpers::write_answer_cache();
+    return if ($c->aborted());
+    $r->rflush();
+    # close progress window
+    &Apache::lonhtmlcommon::Close_PrgWin($r,\%prog_state);
+    return;
+}
+
+#####################################################
+#####################################################
+
+=pod
+
 =item analyze_problem_as_student
 
 Analyzes a homework problem for a student and returns the correct answer
@@ -424,11 +478,11 @@ sub get_answer {
             }
             foreach my $foil (@{$Answer{$prefix.'.shown'}}) {
                 if (ref($values{$foil}) eq 'ARRAY') {
-                    $returnvalue.=&HTML::Entities::encode($foil).'='.
-                        join(',',map {&HTML::Entities::encode($_)} @{$values{$foil}}).'&';
+                    $returnvalue.=&HTML::Entities::encode($foil,'<>&"').'='.
+                        join(',',map {&HTML::Entities::encode($_,'<>&"')} @{$values{$foil}}).'&';
                 } else {
-                    $returnvalue.=&HTML::Entities::encode($foil).'='.
-                        &HTML::Entities::encode($values{$foil}).'&';
+                    $returnvalue.=&HTML::Entities::encode($foil,'<>&"').'='.
+                        &HTML::Entities::encode($values{$foil},'<>&"').'&';
                 }
             }
             $returnvalue =~ s/ /\%20/g;
@@ -947,6 +1001,43 @@ sub get_time_limits {
     return ($starttime,$endtime);
 }
 
+
+
+####################################################
+####################################################
+
+=pod
+
+=item sections_description 
+
+Inputs: @Sections, an array of sections
+
+Returns: A text description of the sections selected.
+
+=cut
+
+####################################################
+####################################################
+sub sections_description {
+    my @Sections = @_;
+    my $sectionstring = '';
+    if (scalar(@Sections) > 1) {
+        if (scalar(@Sections) > 2) {
+            my $last = pop(@Sections);
+            $sectionstring = "Sections ".join(', ',@Sections).', and '.$last;
+        } else {
+            $sectionstring = "Sections ".join(' and ',@Sections);
+        }
+    } else {
+        if ($Sections[0] eq 'all') {
+            $sectionstring = "All sections";
+        } else {
+            $sectionstring = "Section ".$Sections[0];
+        }
+    }
+    return $sectionstring;
+}
+
 ####################################################
 ####################################################