[WWcvs] pg: Fix inheritance so that text_values and test_adapt are preserved when transferring to the stored copy of the adapted

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

Log Message:
-----------
Fix inheritance so that text_values and test_adapt are preserved when
transferring to the stored copy of the adapted function.  (These are
needed for the diagnostics output.)  Use new Parser::Eval to avoid
ugliness in trying to trap errors in comparisons.

Modified Files:
--------------
    pg/macros:
        parserFormulaUpToConstant.pl

Revision Data
-------------
Index: parserFormulaUpToConstant.pl
===================================================================
RCS file: /webwork/cvs/system/pg/macros/parserFormulaUpToConstant.pl,v
retrieving revision 1.19
retrieving revision 1.20
diff -Lmacros/parserFormulaUpToConstant.pl -Lmacros/parserFormulaUpToConstant.pl -u -r1.19 -r1.20
--- macros/parserFormulaUpToConstant.pl
+++ macros/parserFormulaUpToConstant.pl
@@ -173,12 +173,16 @@
   #  If constants aren't the same, substitute the professor's in the student answer.
   #
   $r = $r->substitute($r->{constant}=>$l->{constant}) unless $r->{constant} eq $l->{constant};
+
   #
   #  Compare with adaptive parameters to see if $l + n0 C = $r for some n0.
   #
   my $adapt = $l->adapt;
-  my $equal = $adapt->cmp_compare($r,{});
+  my $equal = Parser::Eval(sub {$adapt == $r});
   $self->{adapt} = $self->{adapt}->inherit($adapt);            # save the adapted value's flags
+  $self->{adapt}{test_values} = $adapt->{test_values};         #  (these two are removed by inherit)
+  $self->{adapt}{test_adapt} = $adapt->{test_adapt};
+  $_[1]->{test_values} = $r->{test_values};            # save these in student answer for diagnostics
   return -1 unless $equal;
   #
   #  Check that n0 is non-zero (i.e., there is a multiple of C in the student answer)
@@ -192,7 +196,6 @@
 #
 sub adapt {
   my $self = shift;
-  my $adapt = $self->{adapt}->inherit($self); delete $adapt->{adapt};
   return $self->adjustInherit($self->{adapt});
 }
 
@@ -262,7 +265,10 @@
 #
 sub cmp_diagnostics {
   my $self = shift;
-  $self->inherit($self->{adapt})->SUPER::cmp_diagnostics(@_);
+  my $adapt = $self->inherit($self->{adapt});
+  $adapt->{test_values} = $self->{adapt}{test_values};  # these aren't copied by inherit
+  $adapt->{test_adapt}  = $self->{adapt}{test_adapt};
+  $adapt->SUPER::cmp_diagnostics(@_);
 }
 
 #
@@ -289,9 +295,7 @@
   return unless $ans->{score} == 0 && !$ans->{isPreview};
   return if $ans->{ans_message} || !$self->getFlag("showHints");
   my $student = $ans->{student_value};
-  $main::{_cmp_} = sub {return $ans->{correct_value} <=> $student}; # compare encodes the reason in the result
-  my $result = main::PG_restricted_eval('&{$main::{_cmp_}}');
-  delete $main::{_cmp_};
+  my $result = Parser::Eval(sub {return $ans->{correct_value} <=> $student}); # compare encodes the reason in the result
   $self->cmp_Error($ans,"Note: there is always more than one posibility") if $result == 2 || $result == 3;
   if ($result == 3) {
     my $context = $self->context;