[WWcvs] pg: Handle variables in formula 'constants' properly

[dpvc v. a. <we...@ma...>]

Log Message:
-----------
Handle variables in formula 'constants' properly

Modified Files:
--------------
    pg/lib/Parser:
        Constant.pm

Revision Data
-------------
Index: Constant.pm
===================================================================
RCS file: /webwork/cvs/system/pg/lib/Parser/Constant.pm,v
retrieving revision 1.16
retrieving revision 1.17
diff -Llib/Parser/Constant.pm -Llib/Parser/Constant.pm -u -r1.16 -r1.17
--- lib/Parser/Constant.pm
+++ lib/Parser/Constant.pm
@@ -25,6 +25,8 @@
   }, $class;
   $c->weaken;
   $c->{isConstant} = 1 if $const->{isConstant};
+  $equation->{variables} = {%{$equation->{variables}},%{$const->{value}{variables}}}
+    if Value::isFormula($const->{value});
   return $c;
 }
 
@@ -60,6 +62,15 @@
 }
 
 #
+#  Include variables from constant formulas
+#
+sub getVariables {
+  my $self = shift; my $data = $self->{def}{value};
+  return {} unless Value::isFormula($data);
+  return $data->{tree}->getVariables;
+}
+
+#
 #  Return the constant's name
 #
 sub string {