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package XML::XPath::PerlSAX;
$VERSION = '1.44';
use XML::XPath::Node qw(:node_keys);
use XML::XPath::XMLParser;
use strict; use warnings;
sub new {
my $class = shift;
my %args = @_;
bless \%args, $class;
}
sub parse {
my $self = shift;
die "XML::XPath::PerlSAX: parser instance ($self) already parsing\n"
if (defined $self->{ParseOptions});
# If there's one arg and it's an array ref, assume it's a node we're parsing
my $args;
if (@_ == 1 && ref($_[0]) =~ /^(text|comment|element|namespace|attribute|pi)$/) {
# warn "Parsing node\n";
my $node = shift;
# warn "PARSING: $node ", XML::XPath::XMLParser::as_string($node), "\n\n";
$args = { Source => { Node => $node } };
}
else {
$args = (@_ == 1) ? shift : { @_ };
}
my $parse_options = { %$self, %$args };
$self->{ParseOptions} = $parse_options;
# ensure that we have at least one source
if (!defined $parse_options->{Source} ||
!defined $parse_options->{Source}{Node}) {
die "XML::XPath::PerlSAX: no source defined for parse\n";
}
# assign default Handler to any undefined handlers
if (defined $parse_options->{Handler}) {
$parse_options->{DocumentHandler} = $parse_options->{Handler}
if (!defined $parse_options->{DocumentHandler});
}
# ensure that we have a DocumentHandler
if (!defined $parse_options->{DocumentHandler}) {
die "XML::XPath::PerlSAX: no Handler or DocumentHandler defined for parse\n";
}
# cache DocumentHandler in self for callbacks
$self->{DocumentHandler} = $parse_options->{DocumentHandler};
if ((ref($parse_options->{Source}{Node}) eq 'element') &&
!($parse_options->{Source}{Node}->[node_parent])) {
# Got root node
$self->{DocumentHandler}->start_document( { } );
$self->parse_node($parse_options->{Source}{Node});
return $self->{DocumentHandler}->end_document( { } );
}
else {
$self->parse_node($parse_options->{Source}{Node});
}
# clean up parser instance
delete $self->{ParseOptions};
delete $self->{DocumentHandler};
}
sub parse_node {
my $self = shift;
my $node = shift;
# warn "parse_node $node\n";
if (ref($node) eq 'element' && $node->[node_parent]) {
# bundle up attributes
my @attribs;
foreach my $attr (@{$node->[node_attribs]}) {
if ($attr->[node_prefix]) {
push @attribs, $attr->[node_prefix] . ":" . $attr->[node_key];
}
else {
push @attribs, $attr->[node_key];
}
push @attribs, $attr->[node_value];
}
$self->{DocumentHandler}->start_element(
{ Name => $node->[node_name],
Attributes => \@attribs,
}
);
foreach my $kid (@{$node->[node_children]}) {
$self->parse_node($kid);
}
$self->{DocumentHandler}->end_element(
{
Name => $node->[node_name],
}
);
}
elsif (ref($node) eq 'text') {
$self->{DocumentHandler}->characters($node->[node_text]);
}
elsif (ref($node) eq 'comment') {
$self->{DocumentHandler}->comment($node->[node_comment]);
}
elsif (ref($node) eq 'pi') {
$self->{DocumentHandler}->processing_instruction(
{
Target => $node->[node_target],
Data => $node->[node_data]
}
);
}
elsif (ref($node) eq 'element') { # root node
# just do kids
foreach my $kid (@{$node->[node_children]}) {
$self->parse_node($kid);
}
}
else {
die "Unknown node type: '", ref($node), "' ", scalar(@$node), "\n";
}
}
1;
__END__
=head1 NAME
XML::XPath::PerlSAX - A PerlSAX event generator for my weird node structure
=head1 SYNOPSIS
use XML::XPath;
use XML::XPath::PerlSAX;
use XML::DOM::PerlSAX;
my $xp = XML::XPath->new(filename => 'test.xhtml');
my $paras = $xp->find('/html/body/p');
my $handler = XML::DOM::PerlSAX->new();
my $generator = XML::XPath::PerlSAX->new( Handler => $handler );
foreach my $node ($paras->get_nodelist) {
my $domtree = $generator->parse($node);
# do something with $domtree
}
=head1 DESCRIPTION
This module generates PerlSAX events to pass to a PerlSAX handler such
as XML::DOM::PerlSAX. It operates specifically on my weird tree format.
Unfortunately SAX doesn't seem to cope with namespaces, so these are
lost completely. I believe SAX2 is doing namespaces.
=head1 Other
The XML::DOM::PerlSAX handler I tried was completely broken (didn't even
compile before I patched it a bit), so I don't know how correct this
is or how far it will work.
=head1 LICENSE AND COPYRIGHT
This module is copyright 2000 AxKit.com Ltd. This is free software, and as such
comes with NO WARRANTY. No dates are used in this module. You may distribute this
module under the terms of either the Gnu GPL, or the Artistic License (the same
terms as Perl itself).
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