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# $Id: XPathContext.pm 422 2002-11-08 17:10:30Z phish $
package XML::LibXML::XPathContext;
use strict;
use vars qw($VERSION @ISA $USE_LIBXML_DATA_TYPES);
use Carp;
use XML::LibXML;
use XML::LibXML::NodeList;
$VERSION = "1.66"; # VERSION TEMPLATE: DO NOT CHANGE
# should LibXML XPath data types be used for simple objects
# when passing parameters to extension functions (default: no)
$USE_LIBXML_DATA_TYPES = 0;
sub findnodes {
my ($self, $xpath, $node) = @_;
my @nodes = $self->_guarded_find_call('_findnodes', $xpath, $node);
if (wantarray) {
return @nodes;
}
else {
return XML::LibXML::NodeList->new(@nodes);
}
}
sub find {
my ($self, $xpath, $node) = @_;
my ($type, @params) = $self->_guarded_find_call('_find', $xpath, $node);
if ($type) {
return $type->new(@params);
}
return undef;
}
sub findvalue {
my $self = shift;
return $self->find(@_)->to_literal->value;
}
sub _guarded_find_call {
my ($self, $method, $xpath, $node) = @_;
my $prev_node;
if (ref($node)) {
$prev_node = $self->getContextNode();
$self->setContextNode($node);
}
my @ret;
eval {
@ret = $self->$method($xpath);
};
$self->_free_node_pool;
$self->setContextNode($prev_node) if ref($node);
if ($@) {
my $err = $@;
chomp $err;
croak $err;
}
return @ret;
}
sub registerFunction {
my ($self, $name, $sub) = @_;
$self->registerFunctionNS($name, undef, $sub);
return;
}
sub unregisterNs {
my ($self, $prefix) = @_;
$self->registerNs($prefix, undef);
return;
}
sub unregisterFunction {
my ($self, $name) = @_;
$self->registerFunctionNS($name, undef, undef);
return;
}
sub unregisterFunctionNS {
my ($self, $name, $ns) = @_;
$self->registerFunctionNS($name, $ns, undef);
return;
}
sub unregisterVarLookupFunc {
my ($self) = @_;
$self->registerVarLookupFunc(undef, undef);
return;
}
# extension function perl dispatcher
# borrowed from XML::LibXSLT
sub _perl_dispatcher {
my $func = shift;
my @params = @_;
my @perlParams;
my $i = 0;
while (@params) {
my $type = shift(@params);
if ($type eq 'XML::LibXML::Literal' or
$type eq 'XML::LibXML::Number' or
$type eq 'XML::LibXML::Boolean')
{
my $val = shift(@params);
unshift(@perlParams, $USE_LIBXML_DATA_TYPES ? $type->new($val) : $val);
}
elsif ($type eq 'XML::LibXML::NodeList') {
my $node_count = shift(@params);
unshift(@perlParams, $type->new(splice(@params, 0, $node_count)));
}
}
$func = "main::$func" unless ref($func) || $func =~ /(.+)::/;
no strict 'refs';
my $res = $func->(@perlParams);
return $res;
}
1;
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