[WWcvs] pg: Give better error messages when the entries in Points, Vectors and

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

Log Message:
-----------
Give better error messages when the entries in Points, Vectors and
Matrices are not of the right type.

Modified Files:
--------------
    pg/lib/Parser/List:
        Matrix.pm
        Point.pm
        Vector.pm

Revision Data
-------------
Index: Vector.pm
===================================================================
RCS file: /webwork/cvs/system/pg/lib/Parser/List/Vector.pm,v
retrieving revision 1.4
retrieving revision 1.5
diff -Llib/Parser/List/Vector.pm -Llib/Parser/List/Vector.pm -u -r1.4 -r1.5
--- lib/Parser/List/Vector.pm
+++ lib/Parser/List/Vector.pm
@@ -16,8 +16,11 @@
 sub _check {
   my $self = shift;
   foreach my $x (@{$self->{coords}}) {
-    $self->{equation}->Error("Coordinates of Vector must be Numbers")
-      unless $x->isNumber;
+    unless ($x->isNumber) {
+      my $type = $x->type;
+      $type = (($type =~ m/^[aeiou]/i)? "an ": "a ") . $type;
+      $self->{equation}->Error(["Coordinates of Vectors must be Numbers, not %s",$type]);
+    }
   }
 }
 
Index: Matrix.pm
===================================================================
RCS file: /webwork/cvs/system/pg/lib/Parser/List/Matrix.pm,v
retrieving revision 1.4
retrieving revision 1.5
diff -Llib/Parser/List/Matrix.pm -Llib/Parser/List/Matrix.pm -u -r1.4 -r1.5
--- lib/Parser/List/Matrix.pm
+++ lib/Parser/List/Matrix.pm
@@ -19,6 +19,10 @@
     foreach my $x (@{$self->{coords}})
       {$x->makeMatrix($self->{type}{name},$self->{open},$self->{close})}
   }
+  foreach my $x (@{$self->{coords}}) {
+    $self->{equation}->Error("Entries in a Matrix must be Numbers or Lists")
+      unless ($x->class =~ m/Number|List/);
+  }
 }
 
 #
Index: Point.pm
===================================================================
RCS file: /webwork/cvs/system/pg/lib/Parser/List/Point.pm,v
retrieving revision 1.2
retrieving revision 1.3
diff -Llib/Parser/List/Point.pm -Llib/Parser/List/Point.pm -u -r1.2 -r1.3
--- lib/Parser/List/Point.pm
+++ lib/Parser/List/Point.pm
@@ -7,10 +7,20 @@
 @ISA = qw(Parser::List);
 
 #
-#  The basic List class does it all.  We only need this class
-#  for its name.
+#  The basic List class does most of the checking.
 #
 
+sub _check {
+  my $self = shift;
+  foreach my $x (@{$self->{coords}}) {
+    unless ($x->isNumber) {
+      my $type = $x->type;
+      $type = (($type =~ m/^[aeiou]/i)? "an ": "a ") . $type;
+      $self->{equation}->Error(["Coordinates of Points must be Numbers, not %s",$type]);
+    }
+  }
+}
+
 #########################################################################
 
 1;