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