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-rw-r--r--contrib/perl5/lib/base.pm92
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diff --git a/contrib/perl5/lib/base.pm b/contrib/perl5/lib/base.pm
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-=head1 NAME
-
-base - Establish IS-A relationship with base class at compile time
-
-=head1 SYNOPSIS
-
- package Baz;
- use base qw(Foo Bar);
-
-=head1 DESCRIPTION
-
-Roughly similar in effect to
-
- BEGIN {
- require Foo;
- require Bar;
- push @ISA, qw(Foo Bar);
- }
-
-Will also initialize the %FIELDS hash if one of the base classes has
-it. Multiple inheritance of %FIELDS is not supported. The 'base'
-pragma will croak if multiple base classes have a %FIELDS hash. See
-L<fields> for a description of this feature.
-
-When strict 'vars' is in scope I<base> also let you assign to @ISA
-without having to declare @ISA with the 'vars' pragma first.
-
-If any of the base classes are not loaded yet, I<base> silently
-C<require>s them. Whether to C<require> a base class package is
-determined by the absence of a global $VERSION in the base package.
-If $VERSION is not detected even after loading it, <base> will
-define $VERSION in the base package, setting it to the string
-C<-1, set by base.pm>.
-
-=head1 HISTORY
-
-This module was introduced with Perl 5.004_04.
-
-=head1 SEE ALSO
-
-L<fields>
-
-=cut
-
-package base;
-
-use 5.005_64;
-our $VERSION = "1.01";
-
-sub import {
- my $class = shift;
- my $fields_base;
- my $pkg = caller(0);
-
- foreach my $base (@_) {
- next if $pkg->isa($base);
- push @{"$pkg\::ISA"}, $base;
- unless (exists ${"$base\::"}{VERSION}) {
- 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 (%{"$base\::"}) {
- require Carp;
- Carp::croak("Base class package \"$base\" is empty.\n",
- "\t(Perhaps you need to 'use' the module ",
- "which defines that package first.)");
- }
- ${"$base\::VERSION"} = "-1, set by base.pm"
- unless exists ${"$base\::"}{VERSION};
- }
-
- # A simple test like (defined %{"$base\::FIELDS"}) will
- # sometimes produce typo warnings because it would create
- # the hash if it was not present before.
- my $fglob;
- if ($fglob = ${"$base\::"}{"FIELDS"} and *$fglob{HASH}) {
- if ($fields_base) {
- require Carp;
- Carp::croak("Can't multiply inherit %FIELDS");
- } else {
- $fields_base = $base;
- }
- }
- }
- if ($fields_base) {
- require fields;
- fields::inherit($pkg, $fields_base);
- }
-}
-
-1;
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