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.\" ========================================================================
.\"
.IX Title "YAML::Node 3"
.TH YAML::Node 3 "2016-07-08" "perl v5.16.3" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
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.SH "NAME"
YAML::Node \- A generic data node that encapsulates YAML information
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 2
\&    use YAML;
\&    use YAML::Node;
\&
\&    my $ynode = YAML::Node\->new({}, \*(Aqingerson.com/fruit\*(Aq);
\&    %$ynode = qw(orange orange apple red grape green);
\&    print Dump $ynode;
.Ve
.PP
yields:
.PP
.Vb 4
\&    \-\-\- !ingerson.com/fruit
\&    orange: orange
\&    apple: red
\&    grape: green
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
A generic node in \s-1YAML\s0 is similar to a plain hash, array, or scalar node in
Perl except that it must also keep track of its type. The type is a \s-1URI\s0 called
the \s-1YAML\s0 type tag.
.PP
YAML::Node is a class for generating and manipulating these containers. A \s-1YAML\s0
node (or ynode) is a tied hash, array or scalar. In most ways it behaves just
like the plain thing. But you can assign and retrieve and \s-1YAML\s0 type tag \s-1URI\s0 to
it. For the hash flavor, you can also assign the order that the keys will be
retrieved in. By default a ynode will offer its keys in the same order that
they were assigned.
.PP
YAML::Node has a class method call \fInew()\fR that will return a ynode. You pass
it a regular node and an optional type tag. After that you can use it like
a normal Perl node, but when you YAML::Dump it, the magical properties will
be honored.
.PP
This is how you can control the sort order of hash keys during a \s-1YAML\s0
serialization. By default, \s-1YAML\s0 sorts keys alphabetically. But notice in the
above example that the keys were Dumped in the same order they were assigned.
.PP
YAML::Node exports a function called \fIynode()\fR. This function returns the tied
object so that you can call special methods on it like \->\fIkeys()\fR.
.PP
\&\fIkeys()\fR works like this:
.PP
.Vb 2
\&    use YAML;
\&    use YAML::Node;
\&
\&    %$node = qw(orange orange apple red grape green);
\&    $ynode = YAML::Node\->new($node);
\&    ynode($ynode)\->keys([\*(Aqgrape\*(Aq, \*(Aqapple\*(Aq]);
\&    print Dump $ynode;
.Ve
.PP
produces:
.PP
.Vb 3
\&    \-\-\-
\&    grape: green
\&    apple: red
.Ve
.PP
It tells the ynode which keys and what order to use.
.PP
ynodes will play a very important role in how programs use \s-1YAML.\s0 They are
the foundation of how a Perl class can marshall the Loading and Dumping of
its objects.
.PP
The upcoming versions of \s-1YAML\s0.pm will have much more information on this.
.SH "AUTHOR"
.IX Header "AUTHOR"
Ingy döt Net <ingy@cpan.org>
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright 2001\-2014. Ingy döt Net
.PP
This program is free software; you can redistribute it and/or modify it under
the same terms as Perl itself.
.PP
See <http://www.perl.com/perl/misc/Artistic.html>