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# $Id$
#
# This is free software, you may use it and distribute it under the same terms as
# Perl itself.
#
# Copyright 2001-2003 AxKit.com Ltd., 2002-2006 Christian Glahn, 2006-2009 Petr Pajas
#
#
package XML::LibXML::NodeList;
use strict;
use warnings;
use XML::LibXML::Boolean;
use XML::LibXML::Literal;
use XML::LibXML::Number;
use vars qw($VERSION);
$VERSION = "2.0018"; # VERSION TEMPLATE: DO NOT CHANGE
use overload
'""' => \&to_literal,
'bool' => \&to_boolean,
'cmp' => sub {
my($aa, $bb, $order) = @_;
return ($order ? ("$bb" cmp "$aa") : ("$aa" cmp "$bb"));
},
;
sub new {
my $class = shift;
bless [@_], $class;
}
sub new_from_ref {
my ($class,$array_ref,$reuse) = @_;
return bless $reuse ? $array_ref : [@$array_ref], $class;
}
sub pop {
my $self = CORE::shift;
CORE::pop @$self;
}
sub push {
my $self = CORE::shift;
CORE::push @$self, @_;
}
sub append {
my $self = CORE::shift;
my ($nodelist) = @_;
CORE::push @$self, $nodelist->get_nodelist;
}
sub shift {
my $self = CORE::shift;
CORE::shift @$self;
}
sub unshift {
my $self = CORE::shift;
CORE::unshift @$self, @_;
}
sub prepend {
my $self = CORE::shift;
my ($nodelist) = @_;
CORE::unshift @$self, $nodelist->get_nodelist;
}
sub size {
my $self = CORE::shift;
scalar @$self;
}
sub get_node {
# uses array index starting at 1, not 0
# this is mainly because of XPath.
my $self = CORE::shift;
my ($pos) = @_;
$self->[$pos - 1];
}
sub item
{
my ($self, $pos) = @_;
return $self->[$pos];
}
sub get_nodelist {
my $self = CORE::shift;
@$self;
}
sub to_boolean {
my $self = CORE::shift;
return (@$self > 0) ? XML::LibXML::Boolean->True : XML::LibXML::Boolean->False;
}
# string-value of a nodelist is the string-value of the first node
sub string_value {
my $self = CORE::shift;
return '' unless @$self;
return $self->[0]->string_value;
}
sub to_literal {
my $self = CORE::shift;
return XML::LibXML::Literal->new(
join('', CORE::grep {defined $_} CORE::map { $_->string_value } @$self)
);
}
sub to_number {
my $self = CORE::shift;
return XML::LibXML::Number->new(
$self->to_literal
);
}
sub iterator {
warn "this function is obsolete!\nIt was disabled in version 1.54\n";
return undef;
}
sub map {
my $self = CORE::shift;
my $sub = __is_code(CORE::shift);
local $_;
my @results = CORE::map { @{[ $sub->($_) ]} } @$self;
return unless defined wantarray;
return wantarray ? @results : (ref $self)->new(@results);
}
sub grep {
my $self = CORE::shift;
my $sub = __is_code(CORE::shift);
local $_;
my @results = CORE::grep { $sub->($_) } @$self;
return unless defined wantarray;
return wantarray ? @results : (ref $self)->new(@results);
}
sub sort {
my $self = CORE::shift;
my $sub = __is_code(CORE::shift);
my @results = CORE::sort { $sub->($a,$b) } @$self;
return wantarray ? @results : (ref $self)->new(@results);
}
sub foreach {
my $self = CORE::shift;
my $sub = CORE::shift;
foreach my $item (@$self)
{
local $_ = $item;
$sub->($item);
}
return wantarray ? @$self : $self;
}
sub reverse {
my $self = CORE::shift;
my @results = CORE::reverse @$self;
return wantarray ? @results : (ref $self)->new(@results);
}
sub reduce {
my $self = CORE::shift;
my $sub = __is_code(CORE::shift);
my @list = @$self;
CORE::unshift @list, $_[0] if @_;
my $a = CORE::shift(@list);
foreach my $b (@list)
{
$a = $sub->($a, $b);
}
return $a;
}
sub __is_code {
my ($code) = @_;
if (ref $code eq 'CODE') {
return $code;
}
# There are better ways of doing this, but here I've tried to
# avoid adding any additional external dependencies.
#
if (UNIVERSAL::can($code, 'can') # is blessed (sort of)
and overload::Overloaded($code) # is overloaded
and overload::Method($code, '&{}')) { # overloads '&{}'
return $code;
}
# The other possibility is that $code is a coderef, but is
# blessed into a class that doesn't overload '&{}'. In which
# case... well, I'm stumped!
die "Not a subroutine reference\n";
}
1;
__END__
=head1 NAME
XML::LibXML::NodeList - a list of XML document nodes
=head1 DESCRIPTION
An XML::LibXML::NodeList object contains an ordered list of nodes, as
detailed by the W3C DOM documentation of Node Lists.
=head1 SYNOPSIS
my $results = $dom->findnodes('//somepath');
foreach my $context ($results->get_nodelist) {
my $newresults = $context->findnodes('./other/element');
...
}
=head1 API
=head2 new(@nodes)
You will almost never have to create a new NodeList object, as it is all
done for you by XPath.
=head2 get_nodelist()
Returns a list of nodes, the contents of the node list, as a perl list.
=head2 string_value()
Returns the string-value of the first node in the list.
See the XPath specification for what "string-value" means.
=head2 to_literal()
Returns the concatenation of all the string-values of all
the nodes in the list.
=head2 get_node($pos)
Returns the node at $pos. The node position in XPath is based at 1, not 0.
=head2 size()
Returns the number of nodes in the NodeList.
=head2 pop()
Equivalent to perl's pop function.
=head2 push(@nodes)
Equivalent to perl's push function.
=head2 append($nodelist)
Given a nodelist, appends the list of nodes in $nodelist to the end of the
current list.
=head2 shift()
Equivalent to perl's shift function.
=head2 unshift(@nodes)
Equivalent to perl's unshift function.
=head2 prepend($nodelist)
Given a nodelist, prepends the list of nodes in $nodelist to the front of
the current list.
=head2 map($coderef)
Equivalent to perl's map function.
=head2 grep($coderef)
Equivalent to perl's grep function.
=head2 sort($coderef)
Equivalent to perl's sort function.
Caveat: Perl's magic C<$a> and C<$b> variables are not available in
C<$coderef>. Instead the two terms are passed to the coderef as arguments.
=head2 reverse()
Equivalent to perl's reverse function.
=head2 foreach($coderef)
Inspired by perl's foreach loop. Executes the coderef on each item in
the list. Similar to C<map>, but instead of returning the list of values
returned by $coderef, returns the original NodeList.
=head2 reduce($coderef, $init)
Equivalent to List::Util's reduce function. C<$init> is optional and
provides an initial value for the reduction.
Caveat: Perl's magic C<$a> and C<$b> variables are not available in
C<$coderef>. Instead the two terms are passed to the coderef as arguments.
=cut