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# $Id: Builder.pm,v 1.10 2001/06/12 20:56:56 matt Exp $
package XML::XPath::Builder;
use strict;
# to get array index constants
use XML::XPath::Node;
use XML::XPath::Node::Element;
use XML::XPath::Node::Attribute;
use XML::XPath::Node::Namespace;
use XML::XPath::Node::Text;
use XML::XPath::Node::PI;
use XML::XPath::Node::Comment;
use vars qw/$xmlns_ns $xml_ns/;
$xmlns_ns = "http://www.w3.org/2000/xmlns/";
$xml_ns = "http://www.w3.org/XML/1998/namespace";
sub new {
my $class = shift;
my $self = ($#_ == 0) ? { %{ (shift) } } : { @_ };
bless $self, $class;
}
sub start_document {
my $self = shift;
$self->{IdNames} = {};
$self->{InScopeNamespaceStack} = [ {
'_Default' => undef,
'xmlns' => $xmlns_ns,
'xml' => $xml_ns,
} ];
$self->{NodeStack} = [ ];
my $document = XML::XPath::Node::Element->new();
my $newns = XML::XPath::Node::Namespace->new('xml', $xml_ns);
$document->appendNamespace($newns);
$self->{current} = $self->{DOC_Node} = $document;
}
sub end_document {
my $self = shift;
return $self->{DOC_Node};
}
sub characters {
my $self = shift;
my $sarg = shift;
my $text = $sarg->{Data};
my $parent = $self->{current};
my $last = $parent->getLastChild;
if ($last && $last->isTextNode) {
# append to previous text node
$last->appendText($text);
return;
}
my $node = XML::XPath::Node::Text->new($text);
$parent->appendChild($node, 1);
}
sub start_element {
my $self = shift;
my $sarg = shift;
my $tag = $sarg->{'Name'};
my $attr = $sarg->{'Attributes'};
push @{ $self->{InScopeNamespaceStack} },
{ %{ $self->{InScopeNamespaceStack}[-1] } };
$self->_scan_namespaces(@_);
my ($prefix, $namespace) = $self->_namespace($tag);
my $node = XML::XPath::Node::Element->new($tag, $prefix);
foreach my $name (keys %$attr) {
my $value = $attr->{$name};
if ($name =~ /^xmlns(:(.*))?$/) {
# namespace node
my $prefix = $2 || '#default';
# warn "Creating NS node: $prefix = $value\n";
my $newns = XML::XPath::Node::Namespace->new($prefix, $value);
$node->appendNamespace($newns);
}
else {
my ($prefix, $namespace) = $self->_namespace($name);
undef $namespace unless $prefix;
my $newattr = XML::XPath::Node::Attribute->new($name, $value, $prefix);
$node->appendAttribute($newattr, 1);
if (exists($self->{IdNames}{$tag}) && ($self->{IdNames}{$tag} eq $name)) {
# warn "appending Id Element: $val for ", $node->getName, "\n";
$self->{DOC_Node}->appendIdElement($value, $node);
}
}
}
$self->{current}->appendChild($node, 1);
$self->{current} = $node;
}
sub end_element {
my $self = shift;
$self->{current} = $self->{current}->getParentNode;
}
sub processing_instruction {
my $self = shift;
my $pi = shift;
my $node = XML::XPath::Node::PI->new($pi->{Target}, $pi->{Data});
$self->{current}->appendChild($node, 1);
}
sub comment {
my $self = shift;
my $comment = shift;
my $node = XML::XPath::Node::Comment->new($comment->{Data});
$self->{current}->appendChild($node, 1);
}
sub _scan_namespaces {
my ($self, %attributes) = @_;
while (my ($attr_name, $value) = each %attributes) {
if ($attr_name eq 'xmlns') {
$self->{InScopeNamespaceStack}[-1]{'_Default'} = $value;
} elsif ($attr_name =~ /^xmlns:(.*)$/) {
my $prefix = $1;
$self->{InScopeNamespaceStack}[-1]{$prefix} = $value;
}
}
}
sub _namespace {
my ($self, $name) = @_;
my ($prefix, $localname) = split(/:/, $name);
if (!defined($localname)) {
if ($prefix eq 'xmlns') {
return '', undef;
} else {
return '', $self->{InScopeNamespaceStack}[-1]{'_Default'};
}
} else {
return $prefix, $self->{InScopeNamespaceStack}[-1]{$prefix};
}
}
1;
__END__
=head1 NAME
XML::XPath::Builder - SAX handler for building an XPath tree
=head1 SYNOPSIS
use AnySAXParser;
use XML::XPath::Builder;
$builder = XML::XPath::Builder->new();
$parser = AnySAXParser->new( Handler => $builder );
$root_node = $parser->parse( Source => [SOURCE] );
=head1 DESCRIPTION
C<XML::XPath::Builder> is a SAX handler for building an XML::XPath
tree.
C<XML::XPath::Builder> is used by creating a new instance of
C<XML::XPath::Builder> and providing it as the Handler for a SAX
parser. Calling `C<parse()>' on the SAX parser will return the
root node of the tree built from that parse.
=head1 AUTHOR
Ken MacLeod, <ken@bitsko.slc.ut.us>
=head1 SEE ALSO
perl(1), XML::XPath(3)
PerlSAX.pod in libxml-perl
Extensible Markup Language (XML) <http://www.w3c.org/XML>
=cut
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