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# BioPerl module for Bio::TreeIO::nhx
# Please direct questions and support issues to <>
# Cared for by Aaron Mackey <>
# Copyright Aaron Mackey
# You may distribute this module under the same terms as perl itself
# POD documentation - main docs before the code
=head1 NAME
Bio::TreeIO::nhx - TreeIO implementation for parsing
Newick/New Hampshire eXtendend (NHX) format.
# do not use this module directly
use Bio::TreeIO;
my $treeio = Bio::TreeIO->new(-format => 'nhx', -file => 'tree.dnd');
my $tree = $treeio->next_tree;
This module handles parsing and writing of Newick/New Hampshire eXtended (NHX) format.
=head2 Mailing Lists
User feedback is an integral part of the evolution of this and other
Bioperl modules. Send your comments and suggestions preferably to the
Bioperl mailing list. Your participation is much appreciated. - General discussion - About the mailing lists
=head2 Support
Please direct usage questions or support issues to the mailing list:
rather than to the module maintainer directly. Many experienced and
reponsive experts will be able look at the problem and quickly
address it. Please include a thorough description of the problem
with code and data examples if at all possible.
=head2 Reporting Bugs
Report bugs to the Bioperl bug tracking system to help us keep track
of the bugs and their resolution. Bug reports can be submitted viax the
=head1 AUTHOR - Aaron Mackey
Email jason-at-bioperl-dot-org
The rest of the documentation details each of the object methods.
Internal methods are usually preceded with a _
# Let the code begin...
package Bio::TreeIO::nhx;
use strict;
# Object preamble - inherits from Bio::Root::Root
use Bio::Tree::NodeNHX;
use Bio::Event::EventGeneratorI;
#use XML::Handler::Subs;
use base qw(Bio::TreeIO::newick);
sub _initialize {
my($self, %args) = @_;
$args{-nodetype} ||= 'Bio::Tree::NodeNHX';
sub _node_as_string {
my $self = shift;
my $node = shift;
my $params = shift;
my $label_stringbuffer = $self->SUPER::_node_as_string($node,$params);
my @tags = $node->get_all_tags;
if( scalar(@tags) > 0 ) {
@tags = sort @tags;
$label_stringbuffer .= '[' .
join(":", "&&NHX",
map { "$_=" .join(',',$node->get_tag_values($_)) }
@tags ) . ']';
return $label_stringbuffer;
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