view Lib/IMPL/XML/SaxParser.pm @ 368:010ceafd0c5a

form metadata + tests
author cin
date Wed, 04 Dec 2013 17:31:53 +0400
parents 248f95c1762a
children
line wrap: on
line source

package IMPL::XML::SaxParser;
use strict;

use IMPL::Const qw(:prop);
use IMPL::declare {
	require => {
		XMLReader    => 'XML::LibXML::Reader',
		Exception    => 'IMPL::Exception',
		ArgException => '-IMPL::InvalidArgumentException'
	  },
	  base  => [ 'IMPL::Object' => undef ],
	  props => [ _reader        => PROP_RW ]
};

BEGIN {
	XMLReader->import;
}

sub Parse {
	my ( $this, $options ) = @_;

	my $reader = $this->_reader( XMLReader->new($options) );

	if ( $reader->read() > 0) {
		$this->ProcessRootNode($reader);
	}
}

sub ProcessRootNode {
	my ( $this, $reader ) = @_;
	warn "not implemented";
}

sub ReadChildren {
	my ( $this, $handler ) = @_;

	my $reader = $this->_reader;
	
	# содержимое можеть быть только у не пустых элементов
	if($reader->nodeType == XML_READER_TYPE_ELEMENT && !$reader->isEmptyElement) {
		# нужно прочитать все, что ниже, для этого запоминаем текущий уровень
		my $currentLevel = $reader->depth;
		
		# при чтении и проверке данного условия "съедается" закрывающий теэг текущего узла
		while($reader->read && $reader->depth > $currentLevel) {
			# при обходе дочерних узлов нужно пропустить закрывающие узлы
			$this->$handler($reader)
				if $handler	and $reader->nodeType != XML_READER_TYPE_END_ELEMENT;
		}		
	}
}

sub ReadTextNode {
	my ($this) = @_;

	my $text = "";

	my $handler;
	$handler = sub {
		my ( $me, $reader ) = @_;
		if ( $reader->nodeType == XML_READER_TYPE_TEXT ) {
			$text .= $reader->value;
		} else {
			$this->ReadChildren($handler);
		}
	};

	$this->ReadChildren($handler);

	return $text;
}

sub ReadComplexContent {
	goto &ReadComplexNode;
}

sub ReadComplexNode {
	my ( $this, $schema ) = @_;

	if ( ref $schema eq 'HASH' ) {
		my %data;
		
		my ($handlers,$aliases);
		while(my ($selector,$handler) = each %$schema) {
			my ($alias,$node) = split /:/, $selector;
			$node ||= $alias;
			$handlers->{$node} = $handler;
			$aliases->{$node} = $alias;
		}

		$this->ReadChildren(
			sub {
				my ( $me, $node ) = @_;

				my $name = $node->localName;
				my $alias = $aliases->{$name};
				if ( my $handler = $handlers->{$name} ) {
					if (ref $handler eq 'ARRAY') {
						push @{$data{$alias}}, $me->ReadComplexNode($$handler[0]);
					} else {
						$data{$alias} = $me->ReadComplexNode($handler);
					}
				} else {
					$me->ReadChildren();
				}
			}
		);

		return \%data;
	}
	elsif ( ref $schema eq 'CODE' or not ref $schema ) {
		return $this->$schema($this->_reader);
	}
	else {
		die ArgException->new( schema => 'An invalid schema is supplied' );
	}
}

sub attribute {
	shift->_reader->getAttribute(shift);
}

1;

__END__

=pod

=head1 NAME

=head1 DESCRIPTION

=head1 MEMBERS

=head2 ReadComplexNode($schema)

=begin code

{
	comments => sub { shift->ReadTextNode },
	data => [ {
		location => sub { $_[1]->getAttribute('href')} ,
		timestamp => 'ReadTextNode' 
	} ]
}

=end code

=cut