require Exporter;
@ISA = qw(Exporter);
-@EXPORT = qw(save_form restore_form);
+@EXPORT = qw(save_form restore_form compare_numbers any cross);
use YAML;
+use SL::AM;
+
sub save_form {
$main::lxdebug->enter_sub();
+ my @dont_dump_keys = @_;
+ my %not_dumped_values;
+
+ foreach my $key (@dont_dump_keys) {
+ $not_dumped_values{$key} = $main::form->{$key};
+ delete $main::form->{$key};
+ }
+
my $old_form = YAML::Dump($main::form);
$old_form =~ s|!|!:|g;
$old_form =~ s|\n|!n|g;
$old_form =~ s|\r|!r|g;
+ map { $main::form->{$_} = $not_dumped_values{$_} } keys %not_dumped_values;
+
$main::lxdebug->leave_sub();
return $old_form;
sub restore_form {
$main::lxdebug->enter_sub();
- my ($old_form, $no_delete) = @_;
+ my ($old_form, $no_delete, @keep_vars) = @_;
- my $form = $main::form;
+ my $form = $main::form;
+ my %keep_vars_map = map { $_ => 1 } @keep_vars;
- map { delete $form->{$_}; } keys %{$form} unless ($no_delete);
+ map { delete $form->{$_} if (!$keep_vars_map{$_}); } keys %{$form} unless ($no_delete);
$old_form =~ s|!r|\r|g;
$old_form =~ s|!n|\n|g;
$old_form =~ s|![!:]|!|g;
my $new_form = YAML::Load($old_form);
- map { $form->{$_} = $new_form->{$_}; } keys %{$new_form};
+ map { $form->{$_} = $new_form->{$_} if (!$keep_vars_map{$_}) } keys %{ $new_form };
+
+ $main::lxdebug->leave_sub();
+}
+
+sub compare_numbers {
+ $main::lxdebug->enter_sub();
+
+ my $a = shift;
+ my $a_unit = shift;
+ my $b = shift;
+ my $b_unit = shift;
+
+ $main::all_units ||= AM->retrieve_units(\%main::myconfig, $main::form);
+ my $units = $main::all_units;
+
+ if (!$units->{$a_unit} || !$units->{$b_unit} || ($units->{$a_unit}->{base_unit} ne $units->{$b_unit}->{base_unit})) {
+ $main::lxdebug->leave_sub();
+ return undef;
+ }
+
+ $a *= $units->{$a_unit}->{factor};
+ $b *= $units->{$b_unit}->{factor};
$main::lxdebug->leave_sub();
+
+ return $a <=> $b;
+}
+
+sub any (&@) {
+ my $f = shift;
+ return if ! @_;
+ for (@_) {
+ return 1 if $f->();
+ }
+ return 0;
+}
+
+=item cross BLOCK ARRAY ARRAY
+
+Evaluates BLOCK for each combination of elements in ARRAY1 and ARRAY2
+and returns a new list consisting of BLOCK's return values.
+The two elements are set to $a and $b.
+Note that those two are aliases to the original value so changing them
+will modify the input arrays.
+
+ # append each to each
+ @a = qw/a b c/;
+ @b = qw/1 2 3/;
+ @x = cross { "$a$b" } @a, @b;
+ # returns a1, a2, a3, b1, b2, b3, c1, c2, c3
+
+As cross expects an array but returns a list it is not directly chainable
+at the moment. This will be corrected in the future.
+
+=cut
+sub cross(&\@\@) {
+ my $op = shift;
+ use vars qw/@A @B/;
+ local (*A, *B) = @_; # syms for caller's input arrays
+
+ # Localise $a, $b
+ my ($caller_a, $caller_b) = do {
+ my $pkg = caller();
+ no strict 'refs';
+ \*{$pkg.'::a'}, \*{$pkg.'::b'};
+ };
+
+ local(*$caller_a, *$caller_b);
+
+ # This map expression is also the return value.
+ map { my $a_index = $_;
+ map { my $b_index = $_;
+ # assign to $a, $b as refs to caller's array elements
+ (*$caller_a, *$caller_b) = \($A[$a_index], $B[$b_index]);
+ $op->(); # perform the transformation
+ } 0 .. $#B;
+ } 0 .. $#A;
}
1;