Merge pull request #589 from openwebwork/PG-2.16

PG 2.16 Release

README_maketext

@@ -1,9 +1,9 @@
 ##### README
 
 
-Currently (version 1.25) Maketext has a "use strict" line as part of its string parser.  This "use strict" interacts badly with WWSafe and fails.  Unfortunately the use strict cannot be turned off in Maketext.  This means that you can use maketex in PG, but you cannot use any of its features, including simple ones like maketext('Hello [_1] World','Cruel');
+Currently (version 1.25) Maketext has a "use strict" line as part of its string parser.  This "use strict" interacts badly with WWSafe and fails.  Unfortunately the use strict cannot be turned off in Maketext.  This means that you can use maketext in PG, but you cannot use any of its features, including simple ones like maketext('Hello [_1] World','Cruel');
 
 If it becomes necessary to use the more advance versions of maketext in PG we will need to fork Maketext. 
 
 
-
+

VERSION

@@ -1,4 +1,4 @@
-$PG_VERSION  ='2.15';
-$PG_COPYRIGHT_YEARS = '1996-2019';
+$PG_VERSION  ='2.16';
+$PG_COPYRIGHT_YEARS = '1996-2021';
 
 1;

doc/MathObjects/README.pod

@@ -184,3 +184,5 @@ sin 2x return sin(2x) rather than (sin(2))x.
 
 Shows how to switch contexts (in this case, to complex and to vector
 contexts), and how this affects the parsing.
+
+=back

lib/AnswerHash.pm

@@ -122,6 +122,7 @@ BEGIN {
 package AnswerHash;
 use Exporter;
 use PGUtil qw(not_null pretty_print);
+use JSON;
 
 # initialization fields
 my %fields = (		'score'					=>	undef,
@@ -247,19 +248,27 @@ sub score {
 
 =head4  stringify_hash
 
-        Usage:      $rh_ans->stringify_hash;
+	Usage:      $rh_ans->stringify_hash;
 
-        Turns all values in the hash into strings (so they won't cause trouble outside
-        the safe compartment).
+	Turns all values in the hash into strings (so they won't cause trouble outside
+	the safe compartment).
+
+	Hashes and arrays are converted into a JSON string.
 
 =cut
 
 sub stringify_hash {
-  my $self = shift;
-  Parser::Context->current(undef,$self->{correct_value}->context) if $self->{correct_value};
-  foreach my $key (keys %$self) {
-    $self->{$key} = "$self->{$key}" if ref($self->{$key});
-  }
+	my $self = shift;
+	Parser::Context->current(undef,$self->{correct_value}->context) if $self->{correct_value};
+	foreach my $key (keys %$self) {
+		my $ref = ref($self->{$key});
+		next if !$ref;
+		if ($ref eq "HASH" or $ref eq "ARRAY") {
+			$self->{$key} = JSON->new->utf8->allow_unknown->allow_blessed->encode($self->{$key});
+		} else {
+			$self->{$key} = "$self->{$key}";
+		}
+	}
 }
 
 # error methods
@@ -879,6 +888,9 @@ sub blank_postfilter  {
     return($rh_ans) unless defined($rh_ans->{error_flag}) and $rh_ans->{error_flag} eq 'BLANK';
     $rh_ans->{error_flag} = undef;
     $rh_ans->{error_message} = '';
+    if ( defined($rh_ans->{message_for_blank_answer} ) ) {
+        $rh_ans->{ans_message} = $rh_ans->{message_for_blank_answer};
+    }
     $rh_ans->{done} =1;    # no further checking is needed.
     $rh_ans;
 };