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?? Attr.pod(4.02 KB)
?? AttributeHash.pm(4.49 KB)
?? Boolean.pm(1.56 KB)
?? CDATASection.pod(1.28 KB)
?? Comment.pod(1.36 KB)
?? Common.pm(8.2 KB)
?? Common.pod(3.59 KB)
?? DOM.pod(6.23 KB)
?? Devel.pm(4.91 KB)
?? Document.pod(21.09 KB)
?? DocumentFragment.pod(819 B)
?? Dtd.pod(1.99 KB)
?? Element.pod(13.48 KB)
?? ErrNo.pm(27.83 KB)
?? ErrNo.pod(591 B)
?? Error.pm(8.45 KB)
?? Error.pod(5.98 KB)
?? InputCallback.pod(9.59 KB)
?? Literal.pm(2.04 KB)
?? Namespace.pod(3.28 KB)
?? Node.pod(25.67 KB)
?? NodeList.pm(7.31 KB)
?? Number.pm(1.87 KB)
?? PI.pod(2.22 KB)
?? Parser.pod(27.79 KB)
?? Pattern.pod(2.91 KB)
?? Reader.pm(5.75 KB)
?? Reader.pod(17.6 KB)
?? RegExp.pod(1.54 KB)
?? RelaxNG.pod(2.34 KB)
?? SAX
?? SAX.pm(3.45 KB)
?? SAX.pod(1.76 KB)
?? Schema.pod(2.19 KB)
?? Text.pod(5.47 KB)
?? XPathContext.pm(3.15 KB)
?? XPathContext.pod(11.49 KB)
?? XPathExpression.pod(1.64 KB)

Editing: XPathContext.pm

# $Id: XPathContext.pm 422 2002-11-08 17:10:30Z phish $
#
# 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::XPathContext;

use strict;
use warnings;
use vars qw($VERSION @ISA $USE_LIBXML_DATA_TYPES);

use Carp;
use XML::LibXML;
use XML::LibXML::NodeList;

$VERSION = "2.0210"; # 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 CLONE_SKIP { 1 }

sub findnodes {
    my ($self, $xpath, $node) = @_;

my @nodes = $self->_guarded_find_call('_findnodes', $node, $xpath);

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', $node, $xpath,0);

if ($type) {
        return $type->new(@params);
    }
    return undef;
}

sub exists {
    my ($self, $xpath, $node) = @_;
    my (undef, $value) = $self->_guarded_find_call('_find', $node, $xpath,1);
    return $value;
}

sub findvalue {
    my $self = shift;
    return $self->find(@_)->to_literal->value;
}

sub _guarded_find_call {
    my ($self, $method, $node)=(shift,shift,shift);

my $prev_node;
    if (ref($node)) {
        $prev_node = $self->getContextNode();
        $self->setContextNode($node);
    }
    my @ret;
    eval {
        @ret = $self->$method(@_);
    };
    $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;
}

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Editing: XPathContext.pm

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