X-Git-Url: http://dxcluster.org/gitweb/gitweb.cgi?a=blobdiff_plain;f=perl%2FChain.pm;h=27b966c869e823e8f879fcf45501af0c70803922;hb=refs%2Fheads%2Fip_address;hp=cb3a2be83feaf27eabf182ae5be8b84e058aea27;hpb=bf0078cc89a908d46a3f28c7f1c152c2cb4d6fc5;p=spider.git

diff --git a/perl/Chain.pm b/perl/Chain.pm
index cb3a2be8..27b966c8 100644
--- a/perl/Chain.pm
+++ b/perl/Chain.pm
@@ -2,16 +2,14 @@ package Chain;
 
 use strict;
 use Carp;
-	
-use vars qw($VERSION $docheck);
-
-$VERSION = do { my @r = (q$Revision$ =~ /\d+/g); sprintf "%d."."%02d" x $#r, @r};
 
 use constant NEXT => 0;
 use constant PREV => 1;
 use constant OBJ => 2;
 
-$docheck = 1;
+use vars qw($docheck);
+
+$docheck = 0;
 			
 sub _check
 {
@@ -30,10 +28,11 @@ sub setcheck
 # constructor			
 sub new
 {
-	my $name = shift;
-	my $ref = shift;
+	my $pkg = shift;
+	my $name = ref $pkg || $pkg;
+
 	my $self = [];
-	push @$self, $self, $self, $ref;
+	push @$self, $self, $self, @_;
 	return bless $self, $name;
 }
 
@@ -44,7 +43,7 @@ sub ins
 	
 	$docheck && _check($p);
 	
-	my $q = ref $ref && $ref->isa('Chain') ? $ref : new Chain $ref;
+	my $q = ref $ref && $ref->isa('Chain') ? $ref : Chain->new($ref);
 	$q->[PREV] = $p->[PREV];
 	$q->[NEXT] = $p;
 	$p->[PREV]->[NEXT] = $q;
@@ -68,9 +67,10 @@ sub del
 	
 	$docheck && _check($p);
 	
-	$p->[PREV]->[NEXT] = $p->[NEXT];
+	my $q = $p->[PREV]->[NEXT] = $p->[NEXT];
 	$p->[NEXT]->[PREV] = $p->[PREV];
-	return $p->[PREV];
+	$p->[NEXT] = $p->[PREV] = undef;
+	return $q;
 }
 
 # Is this chain empty?
@@ -104,7 +104,7 @@ sub prev
 	
 	$docheck && _check($base);
 	
-	return $base->[NEXT] == $base ? undef : $base->[PREV] unless $p; 
+	return $base->[PREV] == $base ? undef : $base->[PREV] unless $p; 
 	
 	$docheck && _check($p);
 	
@@ -150,6 +150,13 @@ sub count
 	return $count;
 }
 
+sub close
+{
+	my $base = shift;
+	$base->flush;
+	$base->[PREV] = $base->[NEXT] = undef;
+}
+
 1;
 __END__
 # Below is the stub of documentation for your module. You better edit it!
@@ -161,9 +168,9 @@ Chain - Double linked circular chain handler
 =head1 SYNOPSIS
 
   use Chain;
-  $base = new Chain;
-  $p->ins($ref);
-  $p->add($ref);
+  $base = new Chain [$obj];
+  $p->ins($ref [,$obj]);
+  $p->add($ref [,$obj]);
   $ref = $p->obj or $p->obj($ref);
   $q = $base->next($p);
   $q = $base->prev($p);