diff options
Diffstat (limited to 'beagle/debian-rfs/usr/share/perl/5.10.1/base.pm')
| -rw-r--r-- | beagle/debian-rfs/usr/share/perl/5.10.1/base.pm | 181 |
1 files changed, 181 insertions, 0 deletions
diff --git a/beagle/debian-rfs/usr/share/perl/5.10.1/base.pm b/beagle/debian-rfs/usr/share/perl/5.10.1/base.pm new file mode 100644 index 0000000..98a388c --- /dev/null +++ b/beagle/debian-rfs/usr/share/perl/5.10.1/base.pm @@ -0,0 +1,181 @@ +package base; + +use strict 'vars'; +use vars qw($VERSION); +$VERSION = '2.14'; +$VERSION = eval $VERSION; + +# constant.pm is slow +sub SUCCESS () { 1 } + +sub PUBLIC () { 2**0 } +sub PRIVATE () { 2**1 } +sub INHERITED () { 2**2 } +sub PROTECTED () { 2**3 } + +my $Fattr = \%fields::attr; + +sub has_fields { + my($base) = shift; + my $fglob = ${"$base\::"}{FIELDS}; + return( ($fglob && 'GLOB' eq ref($fglob) && *$fglob{HASH}) ? 1 : 0 ); +} + +sub has_version { + my($base) = shift; + my $vglob = ${$base.'::'}{VERSION}; + return( ($vglob && *$vglob{SCALAR}) ? 1 : 0 ); +} + +sub has_attr { + my($proto) = shift; + my($class) = ref $proto || $proto; + return exists $Fattr->{$class}; +} + +sub get_attr { + $Fattr->{$_[0]} = [1] unless $Fattr->{$_[0]}; + return $Fattr->{$_[0]}; +} + +if ($] < 5.009) { + *get_fields = sub { + # Shut up a possible typo warning. + () = \%{$_[0].'::FIELDS'}; + my $f = \%{$_[0].'::FIELDS'}; + + # should be centralized in fields? perhaps + # fields::mk_FIELDS_be_OK. Peh. As long as %{ $package . '::FIELDS' } + # is used here anyway, it doesn't matter. + bless $f, 'pseudohash' if (ref($f) ne 'pseudohash'); + + return $f; + } +} +else { + *get_fields = sub { + # Shut up a possible typo warning. + () = \%{$_[0].'::FIELDS'}; + return \%{$_[0].'::FIELDS'}; + } +} + +sub import { + my $class = shift; + + return SUCCESS unless @_; + + # List of base classes from which we will inherit %FIELDS. + my $fields_base; + + my $inheritor = caller(0); + my @isa_classes; + + my @bases; + foreach my $base (@_) { + if ( $inheritor eq $base ) { + warn "Class '$inheritor' tried to inherit from itself\n"; + } + + next if grep $_->isa($base), ($inheritor, @bases); + + if (has_version($base)) { + ${$base.'::VERSION'} = '-1, set by base.pm' + unless defined ${$base.'::VERSION'}; + } + else { + my $sigdie; + { + local $SIG{__DIE__}; + eval "require $base"; + # Only ignore "Can't locate" errors from our eval require. + # Other fatal errors (syntax etc) must be reported. + die if $@ && $@ !~ /^Can't locate .*? at \(eval /; + unless (%{"$base\::"}) { + require Carp; + local $" = " "; + Carp::croak(<<ERROR); +Base class package "$base" is empty. + (Perhaps you need to 'use' the module which defines that package first, + or make that module available in \@INC (\@INC contains: @INC). +ERROR + } + $sigdie = $SIG{__DIE__} || undef; + } + # Make sure a global $SIG{__DIE__} makes it out of the localization. + $SIG{__DIE__} = $sigdie if defined $sigdie; + ${$base.'::VERSION'} = "-1, set by base.pm" + unless defined ${$base.'::VERSION'}; + } + push @bases, $base; + + if ( has_fields($base) || has_attr($base) ) { + # No multiple fields inheritance *suck* + if ($fields_base) { + require Carp; + Carp::croak("Can't multiply inherit fields"); + } else { + $fields_base = $base; + } + } + } + # Save this until the end so it's all or nothing if the above loop croaks. + push @{"$inheritor\::ISA"}, @isa_classes; + + push @{"$inheritor\::ISA"}, @bases; + + if( defined $fields_base ) { + inherit_fields($inheritor, $fields_base); + } +} + +sub inherit_fields { + my($derived, $base) = @_; + + return SUCCESS unless $base; + + my $battr = get_attr($base); + my $dattr = get_attr($derived); + my $dfields = get_fields($derived); + my $bfields = get_fields($base); + + $dattr->[0] = @$battr; + + if( keys %$dfields ) { + warn <<"END"; +$derived is inheriting from $base but already has its own fields! +This will cause problems. Be sure you use base BEFORE declaring fields. +END + + } + + # Iterate through the base's fields adding all the non-private + # ones to the derived class. Hang on to the original attribute + # (Public, Private, etc...) and add Inherited. + # This is all too complicated to do efficiently with add_fields(). + while (my($k,$v) = each %$bfields) { + my $fno; + if ($fno = $dfields->{$k} and $fno != $v) { + require Carp; + Carp::croak ("Inherited fields can't override existing fields"); + } + + if( $battr->[$v] & PRIVATE ) { + $dattr->[$v] = PRIVATE | INHERITED; + } + else { + $dattr->[$v] = INHERITED | $battr->[$v]; + $dfields->{$k} = $v; + } + } + + foreach my $idx (1..$#{$battr}) { + next if defined $dattr->[$idx]; + $dattr->[$idx] = $battr->[$idx] & INHERITED; + } +} + +1; + +__END__ + |