<?php
// ##################################################################################
// Title : Class RDF
// Version : 1.0
// Author : Jason Diammond -repat RDF parser-
// : Luis Argerich -PHP version of repat- (lrargerich@yahoo.com)
// Last modification date : 06-13-2002
// Description : A port to PHP of the Repat an RDF parser.
// This parser based on expat parses RDF files producing events
// proper of RDF documents.
// ##################################################################################
// History:
// 06-13-2002 : First version of this class.
// ##################################################################################
// To-Dos:
//
// ##################################################################################
// How to use it:
// Read the documentation in rdf.html
// ##################################################################################
if(defined("_class_rdf_is_included")) {
// do nothing since the class is already included
} else {
define("_class_rdf_is_included",1);
/* First we define some constants */
define("XML_NAMESPACE_URI","http://www.w3.org/XML/1998/namespace" );
define("XML_LANG","lang");
define("RDF_NAMESPACE_URI","http://www.w3.org/1999/02/22-rdf-syntax-ns#" );
define("RDF_RDF","RDF");
define("RDF_DESCRIPTION","Description");
define("RDF_ID","ID");
define("RDF_ABOUT","about");
define("RDF_ABOUT_EACH","aboutEach");
define("RDF_ABOUT_EACH_PREFIX","aboutEachPrefix");
define("RDF_BAG_ID","bagID");
define("RDF_RESOURCE","resource");
define("RDF_VALUE","value");
define("RDF_PARSE_TYPE","parseType");
define("RDF_PARSE_TYPE_LITERAL","Literal");
define("RDF_PARSE_TYPE_RESOURCE","Resource");
define("RDF_TYPE","type");
define("RDF_BAG","Bag");
define("RDF_SEQ","Seq");
define("RDF_ALT","Alt");
define("RDF_LI","li");
define("RDF_STATEMENT","Statement");
define("RDF_SUBJECT","subject");
define("RDF_PREDICATE","predicate");
define("RDF_OBJECT","object");
define("NAMESPACE_SEPARATOR_CHAR",'^');
define("NAMESPACE_SEPARATOR_STRING","^");
//define("FALSE",0);
//define("TRUE",1);
define("IN_TOP_LEVEL",0);
define("IN_RDF",1);
define("IN_DESCRIPTION",2);
define("IN_PROPERTY_UNKNOWN_OBJECT",3);
define("IN_PROPERTY_RESOURCE",4);
define("IN_PROPERTY_EMPTY_RESOURCE",5);
define("IN_PROPERTY_LITERAL",6);
define("IN_PROPERTY_PARSE_TYPE_LITERAL",7);
define("IN_PROPERTY_PARSE_TYPE_RESOURCE",8);
define("IN_XML",9);
define("IN_UNKNOWN",10);
//define("IN_PROPERTY_PARSE_TYPE_LITERAL",9);
define("RDF_SUBJECT_TYPE_URI",0);
define("RDF_SUBJECT_TYPE_DISTRIBUTED",1);
define("RDF_SUBJECT_TYPE_PREFIX",2);
define("RDF_SUBJECT_TYPE_ANONYMOUS",3);
define("RDF_OBJECT_TYPE_RESOURCE",0);
define("RDF_OBJECT_TYPE_LITERAL",1);
define("RDF_OBJECT_TYPE_XML",2);
class Rdf_parser {
var $rdf_parser;
/* Private Methods */
function _new_element()
{
$e["parent"]=Array(); // Parent is a blank Array
//$this->clear_element($e["parent"]);
$e["state"]=0;
$e["has_property_atributes"]=0;
$e["has_member_attributes"]=0;
$e["subject_type"]=0;
$e["subject"]='';
$e["predicate"]='';
$e["ordinal"]=0;
$e["members"]=0;
$e["data"]='';
$e["xml_lang"]='';
$e["bag_id"]='';
$e["statements"]=0;
$e["statement_id"]='';
return $e;
}
function _copy_element($source, &$destination )
{
if( $source )
{
$destination["parent"] = $source;
$destination["state"] = $source["state"];
$destination["xml_lang"] = $source["xml_lang"];
}
}
function _clear_element(&$e)
{
$e["subject"]='';
$e["predicate"]='';
$e["data"]='';
$e["bag_id"]='';
$e["statement_id"]='';
if(isset($e["parent"])) {
if( $e["parent"] )
{
if( $e["parent"]["xml_lang"] != $e["xml_lang"] )
{
$e["xml_lang"]='';
}
}
else
{
$e["xml_lang"]='';
}
} else {
$e["xml_lang"]='';
}
//memset( e, 0, strlen( _rdf_element ) );
$e["parent"]=Array();
$e["state"]=0;
$e["has_property_attributes"]=0;
$e["has_member_attributes"]=0;
$e["subject_type"]=0;
$e["subject"]='';
$e["predicate"]='';
$e["ordinal"]=0;
$e["members"]=0;
$e["data"]='';
$e["xml_lang"]='';
$e["bag_id"]='';
$e["statements"]=0;
$e["statement_id"]='';
}
function _push_element()
{
if(!isset($this->rdf_parser["free"])) {
$this->rdf_parser["free"]=Array();
}
if(count($this->rdf_parser["free"])>0)
{
$e = $this->rdf_parser["free"];
if(isset($e["parent"])) {
$this->rdf_parser["free"] = $e["parent"];
} else {
$this->rdf_parser["free"]=$this->_new_element();
}
}
else
{
$e = $this->_new_element();
}
if(!isset($this->rdf_parser["top"])) {
$this->rdf_parser["top"]=Array();
}
$this->_copy_element( $this->rdf_parser["top"], $e );
$this->rdf_parser["top"] = $e;
}
function _pop_element()
{
$e = $this->rdf_parser["top"];
$this->rdf_parser["top"] = $e["parent"];
$this->_clear_element( $e );
/*
if(isset($this->rdf_parser["free"])) {
$e["parent"] = $this->rdf_parser["free"];
} else {
$e["parent"]=0;
}
*/
$this->rdf_parser["free"] = $e;
}
function _delete_elements()
{
}
function _is_rdf_property_attribute_resource($local_name )
{
return ( $local_name == RDF_TYPE );
}
function _is_rdf_property_attribute_literal($local_name )
{
return ( $local_name == RDF_VALUE );
}
function _is_rdf_ordinal( $local_name )
{
$ordinal = -1;
//if($local_name{0}=='_')
if( $local_name{0} == '_' )
{
$ordinal = substr($local_name,1) + 1 ;
}
return ( $ordinal > 0 ) ? $ordinal : 0;
}
function _is_rdf_property_attribute( $local_name )
{
return $this->_is_rdf_property_attribute_resource( $local_name )
|| $this->_is_rdf_property_attribute_literal( $local_name );
}
function _is_rdf_property_element( $local_name )
{
return ( $local_name == RDF_TYPE )
|| ( $local_name == RDF_SUBJECT )
|| ( $local_name == RDF_PREDICATE )
|| ( $local_name == RDF_OBJECT )
|| ( $local_name == RDF_VALUE )
|| ( $local_name == RDF_LI )
|| ( $local_name{0} == '_' );
}
function _istalnum($val) {
return ereg("[A-Za-z0-9]",$val);
}
function _istalpha($val) {
return ereg("[A-Za-z]",$val);
}
function _is_absolute_uri($uri )
{
$result = false;
$uri_p=0;
if( $uri && $this->_istalpha( $uri{$uri_p} ) )
{
++$uri_p;
while( ($uri_p<strlen($uri))
&& ( $this->_istalnum( $uri{$uri_p} )
|| ( $uri{$uri_p} == '+' )
|| ( $uri{$uri_p} == '-' )
|| ( $uri{$uri_p} == '.' ) ) )
{
++$uri_p;
}
$result = ( $uri{$uri_p} == ':' );
}
return $result;
}
/*
This function returns an associative array returning any of the various components of the URL that are present. This includes the
$arr=parse_url($url)
scheme - e.g. http
host
port
user
pass
path
query - after the question mark ?
fragment - after the hashmark #
*/
function _parse_uri($uri,$buffer,$len,&$scheme,&$authority,&$path,&$query,&$fragment ) {
$parsed=parse_url($uri);
if(isset($parsed["scheme"])) {
$scheme=$parsed["scheme"];} else {
$scheme='';
}
if(isset($parsed["host"])) {
$host=$parsed["host"];} else {
$host='';
}
if(isset($parsed["authority"])) {
$authority=$parsed["authority"];} else {
$authority='';
}
if(isset($parsed["path"])) {
$path=$parsed["path"];} else {
$path='';
}
if(isset($parsed["query"])) {
$query=$parsed["query"];} else {
$query='';
}
if(isset($parsed["fragment"])) {
$fragment=$parsed["fragment"];} else {
$fragment='';
}
}
function _resolve_uri_reference($base_uri,$reference_uri,&$buffer,$length )
{
$base_buffer='';
$reference_buffer='';
$path_buffer='';
$buffer = '';
$this->_parse_uri($reference_uri,$reference_buffer,strlen( $reference_buffer ),$reference_scheme,$reference_authority,
$reference_path,$reference_query,$reference_fragment );
if( $reference_scheme == ''
&& $reference_authority == ''
&& $reference_path == ''
&& $reference_query == '' )
{
$buffer=$base_uri;
if( $reference_fragment != '' )
{
$buffer.= "#" ;
$buffer.=$reference_fragment;
}
}
else if( $reference_scheme != '' )
{
$buffer=$reference_uri;
}
else
{
$this->_parse_uri(
$base_uri,
$base_buffer,
strlen( $base_buffer ),
$base_scheme,
$base_authority,
$base_path,
$base_query,
$base_fragment );
$result_scheme = $base_scheme;
if( $reference_authority != '' )
{
$result_authority = $reference_authority;
}
else
{
$result_authority = $base_authority;
if( $reference_path != ''
&& ( ($reference_path{0} == '/')
|| ($reference_path{0} == '\\') ) )
{
$result_path = $reference_path;
}
else
{
$p = '';
$result_path = $path_buffer;
$path_buffer='';
$p = strstr( $base_path, '/' );
if( !$p )
{
$p = strstr( $base_path, '\\' );
}
if( $p )
{
$s = $base_path;
$d = $path_buffer;
$d.=$s;
//while( s <= p )
//{
// *d++ = *s++;
//}
//*d++ = 0;
}
if( $reference_path != '' )
{
$path_buffer.=$reference_path;
}
{
//remove all occurrences of "./"
//print($path_buffer);
$path_buffer=preg_replace("/\/\.\//","/",$path_buffer);
$path_buffer=preg_replace("/\/([^\/\.])*\/..$/","/",$path_buffer);
while(preg_match("/\.\./",$path_buffer)) {
$path_buffer=preg_replace("/\/([^\/\.]*)\/..\//","/",$path_buffer);
}
$path_buffer=preg_replace("/\.$/","",$path_buffer);
}
}
}
// This replaces the C pointer assignament
$result_path = $path_buffer;
if( $result_scheme != '' )
{
$buffer=$result_scheme;
$buffer.=":";
}
if( $result_authority != '' )
{
$buffer.="//";
$buffer.=$result_authority;
}
if( $result_path != '' )
{
$buffer.=$result_path;
}
if( $reference_query != '' )
{
$buffer.="?";
$buffer.=$reference_query;
}
if( $reference_fragment != '' )
{
$buffer.="#";
$buffer.=$reference_fragment;
}
}
}
function is_valid_id($id )
{
$result = false;
$p = $id;
$p_p=0;
if( $id != '' )
{
if( $this->_istalpha( $p )
|| $p{0} == '_'
|| $p{0} == ':' )
{
$result = true;
while( $result != false && ( $p{++$p_p} != 0 ) )
{
if( ! ( $this->_istalnum( $p{$p_p} )
|| $p{$p_p} == '.'
|| $p{$p_p} == '-'
|| $p{$p_p} == '_'
|| $p{$p_p} == ':' ) )
{
$result = false;
}
}
}
}
return $result;
}
function _resolve_id($id,&$buffer,$length )
{
$id_buffer='';
if( $this->is_valid_id( $id ) == true )
{
$id_buffer="#$id";
}
else
{
$this->report_warning( "bad ID attribute: ".$id_buffer."#_bad_ID_attribute_");
}
$this->_resolve_uri_reference( $this->rdf_parser["base_uri"], $id_buffer, $buffer, $length );
}
function _split_name($name, &$buffer, $len,&$namespace_uri, &$local_name )
{
static $nul = 0;
$buffer=$name;
if( strstr( $buffer, NAMESPACE_SEPARATOR_CHAR ) )
{
$cosas=explode(NAMESPACE_SEPARATOR_CHAR,$buffer);
$namespace_uri = $cosas[0];
$local_name = $cosas[1];
}
else
{
if( ( $buffer{ 0 } == 'x' )
&& ( $buffer{ 1 } == 'm' )
&& ( $buffer{ 2 } == 'l' )
&& ( $buffer{ 3 } == ':' ) )
{
$namespace_uri = XML_NAMESPACE_URI;
$local_name = substr($buffer,4);
}
else
{
$namespace_uri = '';
$local_name = $buffer;
}
}
}
function _generate_anonymous_uri(&$buf, $len )
{
$id='';
if(!isset($this->rdf_parser["anonymous_id"])) {
$this->rdf_parser["anonymous_id"]=0;
}
$this->rdf_parser["anonymous_id"]++;
$id="#genid".$this->rdf_parser["anonymous_id"];
$this->_resolve_uri_reference( $this->rdf_parser["base_uri"], $id, $buf, $len );
}
function _report_statement( $subject_type, $subject, $predicate, $ordinal, $object_type, $object, $xml_lang, $bag_id, $statements, $statement_id )
{
$statement_id_type = RDF_SUBJECT_TYPE_URI;
$statement_id_buffer='';
$predicate_buffer='';
if( $this->rdf_parser["statement_handler"] )
{
$this->rdf_parser["statement_handler"]($this->rdf_parser["user_data"],$subject_type,$subject,$predicate,$ordinal,$object_type,$object,$xml_lang );
if( $bag_id )
{
if( $statements == '' )
{
$this->_report_statement(RDF_SUBJECT_TYPE_URI,
$bag_id,
RDF_NAMESPACE_URI.RDF_TYPE,
0,
RDF_OBJECT_TYPE_RESOURCE,
RDF_NAMESPACE_URI.RDF_BAG,
'',
'',
'',
'' );
}
if( ! $statement_id )
{
$statement_id_type = RDF_SUBJECT_TYPE_ANONYMOUS;
$this->_generate_anonymous_uri(
$statement_id_buffer,
strlen( $statement_id_buffer ) );
$statement_id = $statement_id_buffer;
}
$statements++;
$predicate_buffer="RDF_NAMESPACE_URI_".$statements;
$this->_report_statement(
RDF_SUBJECT_TYPE_URI,
$bag_id,
$predicate_buffer,
$statements,
RDF_OBJECT_TYPE_RESOURCE,
$statement_id,
'',
'',
'',
'' );
}
if( $statement_id )
{
// rdf:type = rdf:Statement
$this->_report_statement(
$statement_id_type,
$statement_id,
RDF_NAMESPACE_URI.RDF_TYPE,
0,
RDF_OBJECT_TYPE_RESOURCE,
RDF_NAMESPACE_URI.RDF_STATEMENT,
'',
'',
'',
'' );
// rdf:subject
$this->_report_statement(
$statement_id_type,
$statement_id,
RDF_NAMESPACE_URI.RDF_SUBJECT,
0,
RDF_OBJECT_TYPE_RESOURCE,
$subject,
'',
'',
'',
'' );
// rdf:predicate
$this->_report_statement(
$statement_id_type,
$statement_id,
RDF_NAMESPACE_URI.RDF_PREDICATE,
0,
RDF_OBJECT_TYPE_RESOURCE,
$predicate,
'',
'',
'',
'' );
// rdf:object
$this->_report_statement(
$statement_id_type,
$statement_id,
RDF_NAMESPACE_URI.RDF_OBJECT,
0,
$object_type,
$object,
'',
'',
'',
'' );
}
}
}
function _report_start_parse_type_literal()
{
if( $this->rdf_parser["start_parse_type_literal_handler"] )
{
$this->rdf_parser["start_parse_type_literal_handler"](
$this->rdf_parser["user_data"] );
}
}
function _report_end_parse_type_literal()
{
if( $this->rdf_parser["end_parse_type_literal_handler"] )
{
$this->rdf_parser["end_parse_type_literal_handler"](
$this->rdf_parser["user_data"] );
}
}
function _handle_property_attributes($subject_type, $subject, $attributes, $xml_lang, $bag_id, $statements )
{
$i=0;
$attribute='';
$predicate='';
$attribute_namespace_uri='';
$attribute_local_name='';
$attribute_value='';
$ordinal=0;
for( $i = 0; isset($attributes[ $i ]); $i += 2 )
{
$this->_split_name(
$attributes[ $i ],
$attribute,
strlen( $attribute ),
$attribute_namespace_uri,
$attribute_local_name );
$attribute_value = $attributes[ $i + 1 ];
$predicate=$attribute_namespace_uri;
$predicate.=$attribute_local_name;
if( RDF_NAMESPACE_URI == $attribute_namespace_uri )
{
if( $this->_is_rdf_property_attribute_literal( $attribute_local_name ) )
{
$this->_report_statement(
$subject_type,
$subject,
$predicate,
0,
RDF_OBJECT_TYPE_LITERAL,
$attribute_value,
$xml_lang,
$bag_id,
$statements,
'' );
}
else if( $this->_is_rdf_property_attribute_resource( $attribute_local_name ) )
{
$this->_report_statement(
$subject_type,
$subject,
$predicate,
0,
RDF_OBJECT_TYPE_RESOURCE,
$attribute_value,
'',
$bag_id,
$statements,
'' );
}
else if( ( $ordinal = $this->_is_rdf_ordinal( $attribute_local_name ) ) != 0 )
{
$this->_report_statement(
$subject_type,
$subject,
$predicate,
$ordinal,
RDF_OBJECT_TYPE_LITERAL,
$attribute_value,
$xml_lang,
$bag_id,
$statements,
'' );
}
}
else if( XML_NAMESPACE_URI == $attribute_namespace_uri )
{
//do nothing
}
else if( $attribute_namespace_uri )
{
// is it required that property attributes be in an explicit namespace?
$this->_report_statement(
$subject_type,
$subject,
$predicate,
0,
RDF_OBJECT_TYPE_LITERAL,
$attribute_value,
$xml_lang,
$bag_id,
$statements,
'' );
}
}
}
function _report_start_element( $name, $attributes )
{
if( isset($this->rdf_parser["start_element_handler"]) )
{
$this->rdf_parser["start_element_handler"](
$this->rdf_parser["user_data"],
$name,
$attributes );
}
}
function _report_end_element( $name )
{
if( isset($this->rdf_parser["end_element_handler"]) )
{
$this->rdf_parser["end_element_handler"](
$this->rdf_parser["user_data"],
$name );
}
}
function _report_character_data($s,$len )
{
if( isset($this->rdf_parser["character_data_handler"]) )
{
$this->rdf_parser["character_data_handler"](
$this->rdf_parser["user_data"],
$s,
$len );
}
}
function _report_warning( $warning)
{
// rdf_parser->top->state = IN_UNKNOWN;
if( isset($this->rdf_parser["warning_handler"]) )
{
$this->rdf_parser["warning_handler"] (
$warning);
}
}
function _handle_resource_element( $namespace_uri, $local_name, $attributes, $parent )
{
$subjects_found = 0;
$aux=$attributes;
$aux2=Array();
foreach($attributes as $atkey=>$atvalue) {
$aux2[]=$atkey;
$aux2[]=$atvalue;
}
$attributes=$aux2;
$id = '';
$about = '';
$about_each = '';
$about_each_prefix = '';
$bag_id = '';
$i=0;
$attribute='';
$attribute_namespace_uri='';
$attribute_local_name='';
$attribute_value='';
$id_buffer='';
$type='';
$this->rdf_parser["top"]["has_property_attributes"] = false;
$this->rdf_parser["top"]["has_member_attributes"] = false;
// examine each attribute for the standard RDF "keywords"
for( $i = 0; isset($attributes[$i]); $i += 2 )
{
$this->_split_name(
$attributes[ $i ],
$attribute,
strlen( $attribute ),
$attribute_namespace_uri,
$attribute_local_name );
$attribute_value = $attributes[ $i + 1 ];
// if the attribute is not in any namespace
// or the attribute is in the RDF namespace
if( ( $attribute_namespace_uri == '' )
|| ( $attribute_namespace_uri == RDF_NAMESPACE_URI ))
{
if( $attribute_local_name == RDF_ID )
{
$id = $attribute_value;
++$subjects_found;
}
else if( $attribute_local_name == RDF_ABOUT )
{
$about = $attribute_value;
++$subjects_found;
}
else if( $attribute_local_name == RDF_ABOUT_EACH )
{
$about_each = $attribute_value;
++$subjects_found;
}
else if( $attribute_local_name == RDF_ABOUT_EACH_PREFIX )
{
$about_each_prefix = $attribute_value;
++$subjects_found;
}
else if( $attribute_local_name == RDF_BAG_ID)
{
$bag_id = $attribute_value;
}
else if( $this->_is_rdf_property_attribute( $attribute_local_name ) )
{
$this->rdf_parser["top"]["has_property_attributes"] = true;
}
else if( $this->_is_rdf_ordinal( $attribute_local_name ) )
{
$this->rdf_parser["top"]["has_property_attributes"] = true;
$this->rdf_parser["top"]["has_member_attributes"] = true;
}
else
{
$this->_report_warning(
"unknown or out of context rdf attribute:".$attribute_local_name );
}
}
else if( $attribute_namespace_uri == XML_NAMESPACE_URI )
{
if( $attribute_local_name == XML_LANG )
{
$this->rdf_parser["top"]["xml_lang"] = $attribute_value;
}
}
else if( $attribute_namespace_uri )
{
$this->rdf_parser["top"]["has_property_attributes"] = true;
}
}
// if no subjects were found, generate one.
if( $subjects_found == 0 )
{
$this->_generate_anonymous_uri( $id_buffer, strlen( $id_buffer ) );
$this->rdf_parser["top"]["subject"]=$id_buffer;
$this->rdf_parser["top"]["subject_type"] = RDF_SUBJECT_TYPE_ANONYMOUS;
}
else if( $subjects_found > 1 )
{
$this->_report_warning(
"ID, about, aboutEach, and aboutEachPrefix are mutually exclusive" );
return;
}
else if( $id )
{
$this->_resolve_id( $id, $id_buffer, strlen( $id_buffer ) );
$this->rdf_parser["top"]["subject_type"] = RDF_SUBJECT_TYPE_URI;
$this->rdf_parser["top"]["subject"]=$id_buffer;
}
else if( $about )
{
$this->_resolve_uri_reference( $this->rdf_parser["base_uri"], $about, $id_buffer, strlen( $id_buffer ) );
$this->rdf_parser["top"]["subject_type"] = RDF_SUBJECT_TYPE_URI;
$this->rdf_parser["top"]["subject"]=$id_buffer;
}
else if( $about_each )
{
$this->rdf_parser["top"]["subject_type"] = RDF_SUBJECT_TYPE_DISTRIBUTED;
$this->rdf_parser["top"]["subject"]=$about_each;
}
else if( $about_each_prefix )
{
$this->rdf_parser["top"]["subject_type"] = RDF_SUBJECT_TYPE_PREFIX;
$this->rdf_parser["top"]["subject"]=$about_each_prefix;
}
// if the subject is empty, assign it the document uri
if( $this->rdf_parser["top"]["subject"] == '' )
{
$len = 0;
$this->rdf_parser["top"]["subject"]=$this->rdf_parser["base_uri"];
// now remove the trailing '#'
$len = strlen( $this->rdf_parser["top"]["subject"]);
if( $len > 0 )
{
//$rdf_parser["top"]["subject"][" len - 1 "] = 0;
}
}
if( $bag_id )
{
$this->_resolve_id( $bag_id, $id_buffer, strlen( $id_buffer ) );
$this->rdf_parser["top"]["bag_id"]=$id_buffer;
}
// only report the type for non-rdf:Description elements.
if( ($local_name != RDF_DESCRIPTION )
|| ( $namespace_uri != RDF_NAMESPACE_URI ) )
{
$type=$namespace_uri;
$type.=$local_name;
$this->_report_statement(
$this->rdf_parser["top"]["subject_type"],
$this->rdf_parser["top"]["subject"],
RDF_NAMESPACE_URI.RDF_TYPE,
0,
RDF_OBJECT_TYPE_RESOURCE,
$type,
'',
$this->rdf_parser["top"]["bag_id"],
$this->rdf_parser["top"]["statements"],
'' );
}
// if this element is the child of some property,
// report the appropriate statement.
if( $parent )
{
$this->_report_statement(
$parent["parent"]["subject_type"],
$parent["parent"]["subject"],
$parent["predicate"],
$parent["ordinal"],
RDF_OBJECT_TYPE_RESOURCE,
$this->rdf_parser["top"]["subject"],
'',
$parent["parent"]["bag_id"],
$parent["parent"]["statements"],
$parent["statement_id"] );
}
if( $this->rdf_parser["top"]["has_property_attributes"] )
{
$this->_handle_property_attributes(
$this->rdf_parser["top"]["subject_type"],
$this->rdf_parser["top"]["subject"],
$attributes,
$this->rdf_parser["top"]["xml_lang"],
$this->rdf_parser["top"]["bag_id"],
$this->rdf_parser["top"]["statements"] );
}
}
function _handle_property_element( &$namespace_uri, &$local_name, &$attributes )
{
$buffer='';
$i=0;
$aux=$attributes;
$aux2=Array();
foreach($attributes as $atkey=>$atvalue) {
$aux2[]=$atkey;
$aux2[]=$atvalue;
}
$attributes=$aux2;
$attribute_namespace_uri='';
$attribute_local_name='';
$attribute_value = '';
$resource = '';
$statement_id = '';
$bag_id = '';
$parse_type = '';
$this->rdf_parser["top"]["ordinal"] = 0;
if( $namespace_uri == RDF_NAMESPACE_URI )
{
if( ($this->rdf_parser["top"]["ordinal"] = ( $this->_is_rdf_ordinal( $local_name ) ) != 0 ) )
{
if( $this->rdf_parser["top"]["ordinal"] > $this->rdf_parser["top"]["parent"]["members"] )
{
$this->rdf_parser["top"]["parent"]["members"] = $this->rdf_parser["top"]["ordinal"];
}
}
else if( ! $this->_is_rdf_property_element( $local_name ) )
{
$this->_report_warning(
"unknown or out of context rdf property element: ".$local_name );
return;
}
}
$buffer=$namespace_uri;
if( ( $namespace_uri == RDF_NAMESPACE_URI )
&& ( $local_name == RDF_LI ) )
{
//$ordinal='';
$this->rdf_parser["top"]["parent"]["members"]++;
$this->rdf_parser["top"]["ordinal"] = $this->rdf_parser["top"]["parent"]["members"];
$this->rdf_parser["top"]["ordinal"]=$this->rdf_parser["top"]["ordinal"];
//$ordinal{ 0 } = '_' ;
$buffer.='_'.$this->rdf_parser["top"]["ordinal"];
}
else
{
$buffer.=$local_name;
}
$this->rdf_parser["top"]["predicate"]=$buffer;
$this->rdf_parser["top"]["has_property_attributes"] = false;
$this->rdf_parser["top"]["has_member_attributes"] = false;
for( $i = 0; isset($attributes[$i]); $i += 2 )
{
$this->_split_name(
$attributes[$i],
$buffer,
strlen( $buffer ),
$attribute_namespace_uri,
$attribute_local_name );
$attribute_value = $attributes[$i + 1];
// if the attribute is not in any namespace
// or the attribute is in the RDF namespace
if( ( $attribute_namespace_uri == '' )
|| ( $attribute_namespace_uri == RDF_NAMESPACE_URI ) )
{
if( ( $attribute_local_name == RDF_ID ) )
{
$statement_id = $attribute_value;
}
else if( $attribute_local_name == RDF_PARSE_TYPE )
{
$parse_type = $attribute_value;
}
else if( $attribute_local_name == RDF_RESOURCE )
{
$resource = $attribute_value;
}
else if( $attribute_local_name == RDF_BAG_ID )
{
$bag_id = $attribute_value;
}
else if( $this->_is_rdf_property_attribute( $attribute_local_name ) )
{
$this->rdf_parser["top"]["has_property_attributes"] = true;
}
else
{
$this->_report_warning(
"unknown rdf attribute: ".$attribute_local_name );
return;
}
}
else if( $attribute_namespace_uri == XML_NAMESPACE_URI )
{
if( $attribute_local_name == XML_LANG )
{
$this->rdf_parser["top"]["xml_lang"] = $attribute_value;
}
}
else if( $attribute_namespace_uri )
{
$this->rdf_parser["top"]["has_property_attributes"] = true;
}
}
// this isn't allowed by the M&S but I think it should be
if( $statement_id && $resource )
{
$this->_report_warning(
"rdf:ID and rdf:resource are mutually exclusive" );
return;
}
if( $statement_id )
{
$this->_resolve_id($statement_id, $buffer, strlen( $buffer ) );
$this->rdf_parser["top"]["statement_id"]=$buffer;
}
if( $parse_type )
{
if( $resource )
{
$this->_report_warning(
"property elements with rdf:parseType do not allow rdf:resource" );
return;
}
if( $bag_id )
{
$this->_report_warning(
"property elements with rdf:parseType do not allow rdf:bagID" );
return;
}
if( $this->rdf_parser["top"]["has_property_attributes"] )
{
$this->_report_warning(
"property elements with rdf:parseType do not allow property attributes");
return;
}
if( $attribute_value == RDF_PARSE_TYPE_RESOURCE )
{
$this->_generate_anonymous_uri( $buffer, strlen( $buffer ) );
// since we are sure that this is now a resource property we can report it
$this->_report_statement(
$this->rdf_parser["top"]["parent"]["subject_type"],
$this->rdf_parser["top"]["parent"]["subject"],
$this->rdf_parser["top"]["predicate"],
0,
RDF_OBJECT_TYPE_RESOURCE,
$buffer,
'',
$this->rdf_parser["top"]["parent"]["bag_id"],
$this->rdf_parser["top"]["parent"]["statements"],
$statement_id );
$this->_push_element( );
$this->rdf_parser["top"]["state"] = IN_PROPERTY_PARSE_TYPE_RESOURCE;
$this->rdf_parser["top"]["subject_type"] = RDF_SUBJECT_TYPE_ANONYMOUS;
$this->rdf_parser["top"]["subject"]=$buffer;
$this->rdf_parser["top"]["bag_id"]='';
}
else
{
$this->_report_statement(
$this->rdf_parser["top"]["parent"]["subject_type"],
$this->rdf_parser["top"]["parent"]["subject"],
$this->rdf_parser["top"]["predicate"],
0,
RDF_OBJECT_TYPE_XML,
'',
'',
$this->rdf_parser["top"]["parent"]["bag_id"],
$this->rdf_parser["top"]["parent"]["statements"],
$statement_id );
$this->rdf_parser["top"]["state"] = IN_PROPERTY_PARSE_TYPE_LITERAL;
$this->_report_start_parse_type_literal();
}
}
else if( $resource || $bag_id || $this->rdf_parser["top"]["has_property_attributes"] )
{
if( $resource != '' )
{
$subject_type = RDF_SUBJECT_TYPE_URI;
$this->_resolve_uri_reference( $this->rdf_parser["base_uri"], $resource, $buffer, strlen( $buffer ) );
}
else
{
$subject_type = RDF_SUBJECT_TYPE_ANONYMOUS;
$this->_generate_anonymous_uri( buffer, strlen( $buffer ) );
}
$this->rdf_parser["top"]["state"] = IN_PROPERTY_EMPTY_RESOURCE;
// since we are sure that this is now a resource property we can report it.
$this->_report_statement(
$this->rdf_parser["top"]["parent"]["subject_type"],
$this->rdf_parser["top"]["parent"]["subject"],
$this->rdf_parser["top"]["predicate"],
$this->rdf_parser["top"]["ordinal"],
RDF_OBJECT_TYPE_RESOURCE,
$buffer,
'',
$this->rdf_parser["top"]["parent"]["bag_id"],
$this->rdf_parser["top"]["parent"]["statements"],
'' ); // should we allow IDs?
if( $bag_id )
{
$this->_resolve_id( $bag_id, $buffer, strlen( $buffer ) );
$this->rdf_parser["top"]["bag_id"]=$buffer;
}
if( $this->rdf_parser["top"]["has_property_attributes"] )
{
$this->_handle_property_attributes(
$subject_type,
$buffer,
$attributes,
$this->rdf_parser["top"]["xml_lang"],
$this->rdf_parser["top"]["bag_id"],
$this->rdf_parser["top"]["statements"] );
}
}
}
function _start_element_handler($parser, $name, $attributes )
{
$buffer='';
$namespace_uri='';
$local_name='';
/*
if( rdf_parser->top != '' && rdf_parser->top->state != IN_TOP_LEVEL )
{
++rdf_parser->anonymous_id;
}
*/
$this->_push_element();
$this->_split_name(
$name,
$buffer,
strlen( $buffer ),
$namespace_uri,
$local_name );
switch( $this->rdf_parser["top"]["state"] )
{
case IN_TOP_LEVEL:
if( RDF_NAMESPACE_URI.NAMESPACE_SEPARATOR_STRING.RDF_RDF == $name )
{
$this->rdf_parser["top"]["state"] = IN_RDF;
}
else
{
$this->_report_start_element( $name, $attributes );
}
break;
case IN_RDF:
$this->rdf_parser["top"]["state"] = IN_DESCRIPTION;
$this->_handle_resource_element( $namespace_uri, $local_name, $attributes, '' );
break;
case IN_DESCRIPTION:
case IN_PROPERTY_PARSE_TYPE_RESOURCE:
$this->rdf_parser["top"]["state"] = IN_PROPERTY_UNKNOWN_OBJECT;
$this->_handle_property_element( $namespace_uri, $local_name, $attributes );
break;
case IN_PROPERTY_UNKNOWN_OBJECT:
/* if we're in a property with an unknown object type and we encounter
an element, the object must be a resource, */
$this->rdf_parser["top"]["data"]='';
$this->rdf_parser["top"]["parent"]["state"] = IN_PROPERTY_RESOURCE;
$this->rdf_parser["top"]["state"] = IN_DESCRIPTION;
$this->_handle_resource_element(
$namespace_uri,
$local_name,
$attributes,
$this->rdf_parser["top"]["parent"] );
break;
case IN_PROPERTY_LITERAL:
$this->_report_warning( "no markup allowed in literals" );
break;
case IN_PROPERTY_PARSE_TYPE_LITERAL:
$this->rdf_parser["top"]["state"] = IN_XML;
/* fall through */
case IN_XML:
$this->_report_start_element( $name, $attributes );
break;
case IN_PROPERTY_RESOURCE:
$this->_report_warning(
"only one element allowed inside a property element" );
break;
case IN_PROPERTY_EMPTY_RESOURCE:
$this->_report_warning(
"no content allowed in property with rdf:resource, rdf:bagID, or property attributes" );
break;
case IN_UNKNOWN:
break;
}
}
/*
this is only called when we're in the IN_PROPERTY_UNKNOWN_OBJECT state.
the only time we won't know what type of object a statement has is
when we encounter property statements without property attributes or
content:
<foo:property />
<foo:property ></foo:property>
<foo:property> </foo:property>
notice that the state doesn't switch to IN_PROPERTY_LITERAL when
there is only whitespace between the start and end tags. this isn't
a very useful statement since the object is anonymous and can't
have any statements with it as the subject but it is allowed.
*/
function _end_empty_resource_property()
{
$buffer='';
$this->_generate_anonymous_uri($buffer, strlen( $buffer ) );
$this->_report_statement(
$this->rdf_parser["top"]["parent"]["subject_type"],
$this->rdf_parser["top"]["parent"]["subject"],
$this->rdf_parser["top"]["predicate"],
$this->rdf_parser["top"]["ordinal"],
RDF_OBJECT_TYPE_RESOURCE,
$buffer,
$this->rdf_parser["top"]["xml_lang"],
$this->rdf_parser["top"]["parent"]["bag_id"],
$this->rdf_parser["top"]["parent"]["statements"],
$this->rdf_parser["top"]["statement_id"] );
}
/*
property elements with text only as content set the state to
IN_PROPERTY_LITERAL. as character data is received from expat,
it is saved in a buffer and reported when the end tag is
received.
*/
function _end_literal_property()
{
if(!isset($this->rdf_parser["top"]["statement_id"])) {
$this->rdf_parser["top"]["statement_id"]='';
}
if(!isset($this->rdf_parser["top"]["parent"]["subject_type"])) {
$this->rdf_parser["top"]["parent"]["subject_type"]='';
}
if(!isset($this->rdf_parser["top"]["parent"]["subject"])) {
$this->rdf_parser["top"]["parent"]["subject"]='';
}
if(!isset($this->rdf_parser["top"]["parent"]["bag_id"])) {
$this->rdf_parser["top"]["parent"]["bag_id"]='';
}
if(!isset($this->rdf_parser["top"]["parent"]["statements"])) {
$this->rdf_parser["top"]["parent"]["statements"]=0;
}
if(!isset($this->rdf_parser["top"]["predicate"])) {
$this->rdf_parser["top"]["predicate"]='';
}
if(!isset($this->rdf_parser["top"]["ordinal"])) {
$this->rdf_parser["top"]["ordinal"]=0;
}
$this->_report_statement(
$this->rdf_parser["top"]["parent"]["subject_type"],
$this->rdf_parser["top"]["parent"]["subject"],
$this->rdf_parser["top"]["predicate"],
$this->rdf_parser["top"]["ordinal"],
RDF_OBJECT_TYPE_LITERAL,
$this->rdf_parser["top"]["data"],
$this->rdf_parser["top"]["xml_lang"],
$this->rdf_parser["top"]["parent"]["bag_id"],
$this->rdf_parser["top"]["parent"]["statements"],
$this->rdf_parser["top"]["statement_id"] );
}
function _end_element_handler( $parser, $name )
{
switch( $this->rdf_parser["top"]["state"] )
{
case IN_TOP_LEVEL:
/* fall through */
case IN_XML:
$this->_report_end_element( $name );
break;
case IN_PROPERTY_UNKNOWN_OBJECT:
$this->_end_empty_resource_property();
break;
case IN_PROPERTY_LITERAL:
$this->_end_literal_property( );
break;
case IN_PROPERTY_PARSE_TYPE_RESOURCE:
$this->_pop_element( );
break;
case IN_PROPERTY_PARSE_TYPE_LITERAL:
$this->_report_end_parse_type_literal();
break;
case IN_RDF:
case IN_DESCRIPTION:
case IN_PROPERTY_RESOURCE:
case IN_PROPERTY_EMPTY_RESOURCE:
case IN_UNKNOWN:
break;
}
$this->_pop_element();
}
function _character_data_handler( $parser,$s)
{
$len=strlen($s);
switch( $this->rdf_parser["top"]["state"] )
{
case IN_PROPERTY_LITERAL:
case IN_PROPERTY_UNKNOWN_OBJECT:
if( isset($this->rdf_parser["top"]["data"]) )
{
$n = strlen( $this->rdf_parser["top"]["data"] );
$this->rdf_parser["top"]["data"].= $s;
}
else
{
$this->rdf_parser["top"]["data"]=$s;
}
if( $this->rdf_parser["top"]["state"] == IN_PROPERTY_UNKNOWN_OBJECT )
{
/* look for non-whitespace */
for( $i = 0; (( $i < $len ) && ( ereg(" |\n|\t",$s{ $i }) )); $i++ );
$i++;
/* if we found non-whitespace, this is a literal */
if( $i < $len )
{
$this->rdf_parser["top"]["state"] = IN_PROPERTY_LITERAL;
}
}
break;
case IN_TOP_LEVEL:
case IN_PROPERTY_PARSE_TYPE_LITERAL:
case IN_XML:
$this->_report_character_data(
$s,
strlen($s) );
break;
case IN_RDF:
case IN_DESCRIPTION:
case IN_PROPERTY_RESOURCE:
case IN_PROPERTY_EMPTY_RESOURCE:
case IN_PROPERTY_PARSE_TYPE_RESOURCE:
case IN_UNKNOWN:
break;
}
}
/* public functions */
function rdf_parser_create( $encoding )
{
$parser = xml_parser_create_ns( $encoding, NAMESPACE_SEPARATOR_CHAR );
xml_parser_set_option($parser,XML_OPTION_CASE_FOLDING,0);
$this->rdf_parser["xml_parser"] = $parser;
xml_set_object($this->rdf_parser["xml_parser"],&$this);
xml_set_element_handler( $this->rdf_parser["xml_parser"], "_start_element_handler", "_end_element_handler" );
xml_set_character_data_handler( $this->rdf_parser["xml_parser"], "_character_data_handler" );
return $this->rdf_parser;
}
function rdf_parser_free( )
{
$z=3;
// xml_parser_free( $this->rdf_parser["xml_parser"] );
$this->rdf_parser["base_uri"]='';
$this->_delete_elements( $this->rdf_parser );
unset( $this->rdf_parser );
}
function rdf_set_user_data( &$user_data )
{
$this->rdf_parser["user_data"] = &$user_data;
}
function rdf_get_user_data( )
{
return ( $this->rdf_parser["$user_data"] );
}
function rdf_set_statement_handler($handler )
{
$this->rdf_parser["statement_handler"] = $handler;
}
function rdf_set_parse_type_literal_handler($start,$end )
{
$this->rdf_parser["start_parse_type_literal_handler"] = $start;
$this->rdf_parser["end_parse_type_literal_handler"] = $end;
}
function rdf_set_element_handler($start,$end)
{
$this->rdf_parser["_start_element_handler"] = $start;
$this->rdf_parser["_end_element_handler"] = $end;
}
function rdf_set_character_data_handler( $handler)
{
$this->rdf_parser["_character_data_handler"] = $handler;
}
function rdf_set_warning_handler($handler )
{
$this->rdf_parser["warning_handler"] = $handler;
}
function rdf_parse( $s, $len, $is_final )
{
return XML_Parse( $this->rdf_parser["xml_parser"], $s, $is_final );
}
function rdf_get_xml_parser()
{
return ( $this->rdf_parser["xml_parser"]);
}
function rdf_set_base($base )
{
//tcscpy( buffer, base );
/*
if( buffer[" tcslen( buffer ) - 1 "] != T( '#' ) )
{
tcscat( buffer, T( "#" ) );
}
*/
/* check for out of memory */
$this->rdf_parser["base_uri"]=$base;
return 0;
}
function rdf_get_base()
{
return $this->rdf_parser["base_uri"];
}
function rdf_resolve_uri($uri_reference,&$buffer)
{
_resolve_uri_reference( $this->rdf_parser["base_uri"], $uri_reference, $buffer, strlen($buffer) );
}
}
}
?>
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