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#
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# Maintain a variable to indicate status of a number of requirements
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#
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# --------------
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# Interface
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#
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# exclude(gp) : exclude a group
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# unexclude(gp) : unexclude a group
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# include(gp) : include a group
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# uninclude(gp) : uninclude a group
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# opencontext(gp) : Annonce group context
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# closecontext(gp) : Close group context
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# closelastcontext(set) : Close the last context added to group the group set
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# status() : If include/excluded groups match the current gp context
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# return 1 else 0
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# getincluded() : return an array of included groups
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# getexcluded() : return array of excluded groups
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# clearinclude() : clear all entries from the include list
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# clearexclude() : clear all entries from the exclude list
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# ----------------------------------------------
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# group names are characters. Anything before a :: will indicate the
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# group set upon which the closecontext etc will operate. The group set is
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# still part of the group name.
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#
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package GroupChecker;
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require 5.001;
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require Exporter;
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@ISA=qw(Exporter);
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sub new {
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my $class=shift;
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$self={};
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bless $self, $class;
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$self->{context}{none}=1;
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return $self;
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}
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sub clearinclude {
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my $self=shift;
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undef %{$self->{include}};
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}
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sub clearexclude {
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my $self=shift;
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undef %{$self->{exclude}};
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}
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sub exclude {
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my $self=shift;
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my $gp=shift;
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${$self->{exclude}}{$gp}=1;
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$self->_setstatus;
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}
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sub unexclude {
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my $self=shift;
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my $gp=shift;
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delete ${$self->{exclude}}{$gp};
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$self->_setstatus;
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}
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sub include {
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my $self=shift;
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my $gp=shift;
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${$self->{include}}{$gp}=1;
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$self->_setstatus;
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}
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sub uninclude {
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my $self=shift;
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my $gp=shift;
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delete ${$self->{include}}{$gp};
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$self->_setstatus;
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}
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sub getexcluded {
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my $self=shift;
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return keys %{$self->{exclude}}
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}
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sub getincluded {
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my $self=shift;
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return keys %{$self->{include}}
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}
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sub opencontext {
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my $self=shift;
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my $gp=shift;
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my $set;
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if ( $gp=~/(.*)::/ ) {
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$set=$1;
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}
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else {
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$set='none';
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}
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push @{$self->{contextstack}{$set}}, $gp;
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$self->{context}{$gp}=1;
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$self->_setstatus();
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}
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sub closelastcontext {
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my $self=shift;
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my $set=shift;
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my $gp;
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if ( $set eq "" ) { $set='none' }
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do {
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$gp=pop @{$self->{contextstack}{$set}};
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} while ( (! exists $self->{context}{$gp}) && ($gp eq "") );
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$self->closecontext($gp);
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}
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sub closecontext {
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my $self=shift;
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my $gp=shift;
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if ( $gp=~/(.*)::/ ) {
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$set=$1;
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}
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else {
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$set='none';
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}
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delete $self->{context}{$gp};
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$self->_setstatus();
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}
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sub status {
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my $self=shift;
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return $self->{status};
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}
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# -------------- Support Routines -----------------------------------
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sub _setstatus {
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my $self=shift;
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my $i;
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$self->{status}=1;
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foreach $i ( keys %{$self->{context}} ) {
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if ( ( exists $self->{include}{$i} )
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|| ( exists $self->{include}{all} ) ) {
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$self->{status}=( $self->{status} && 1);
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}
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if ( exists $self->{exclude}{$i} ) {
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$self->{status}=0;
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}
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}
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}
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