xml_htmlsax.php

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    * @access protected
    * @return string
    */
    function scanUntilCharacters($string) {
        $startpos = $this->position;
        while ($this->position < $this->length && strpos($string, $this->rawtext{$this->position}) === FALSE) {
            $this->position++;
        }
        return substr($this->rawtext, $startpos, $this->position - $startpos);
    }

    /**
    * Moves the position forward past any whitespace characters
    * @access protected
    * @return void
    */
    function ignoreWhitespace() {
        while ($this->position < $this->length && 
            strpos(" \n\r\t", $this->rawtext{$this->position}) !== FALSE) {
            $this->position++;
        }
    }

    /**
    * Begins the parsing operation, setting up the unparsed XML entities
    * decorator if necessary then delegating further work to parent
    * @param string XML document to parse
    * @access protected
    * @return void
    */
    function parse($data) {
        parent::parse($data);
    }
}

/**
* Parser for PHP Versions equal to or greater than 4.3.0. Uses a faster
* parsing mechanism than the equivalent PHP < 4.3.0 subclass of StateParser
* @package XML_HTMLSax
* @access protected
* @see XML_HTMLSax_StateParser_Lt430
*/
class XML_HTMLSax_StateParser_Gtet430 extends XML_HTMLSax_StateParser {
    /**
    * Constructs XML_HTMLSax_StateParser_Gtet430 defining available
    * parser options
    * @var XML_HTMLSax instance of user front end class
    * @access protected
    */
    function XML_HTMLSax_StateParser_Gtet430(& $htmlsax) {
        parent::XML_HTMLSax_StateParser($htmlsax);
        $this->parser_options['XML_OPTION_TRIM_DATA_NODES'] = 0;
        $this->parser_options['XML_OPTION_CASE_FOLDING'] = 0;
        $this->parser_options['XML_OPTION_LINEFEED_BREAK'] = 0;
        $this->parser_options['XML_OPTION_TAB_BREAK'] = 0;
        $this->parser_options['XML_OPTION_ENTITIES_PARSED'] = 0;
        $this->parser_options['XML_OPTION_ENTITIES_UNPARSED'] = 0;
        $this->parser_options['XML_OPTION_FULL_ESCAPES'] = 0;
    }
    /**
    * Returns a string from the current position until the first instance of
    * one of the characters in the supplied string argument.
    * @param string string to search until
    * @access protected
    * @return string
    */
    function scanUntilCharacters($string) {
        $startpos = $this->position;
        $length = strcspn($this->rawtext, $string, $startpos);
        $this->position += $length;
        return substr($this->rawtext, $startpos, $length);
    }

    /**
    * Moves the position forward past any whitespace characters
    * @access protected
    * @return void
    */
    function ignoreWhitespace() {
        $this->position += strspn($this->rawtext, " \n\r\t", $this->position);
    }

    /**
    * Begins the parsing operation, setting up the parsed and unparsed
    * XML entity decorators if necessary then delegating further work
    * to parent
    * @param string XML document to parse
    * @access protected
    * @return void
    */
    function parse($data) {
        parent::parse($data);
    }
}

/**
* Default NullHandler for methods which were not set by user
* @package XML_HTMLSax
* @access protected
*/
class XML_HTMLSax_NullHandler {
    /**
    * Generic handler method which does nothing
    * @access protected
    * @return void
    */
    function DoNothing() {
    }
}

/**
* User interface class. All user calls should only be made to this class
* @package XML_HTMLSax
* @access public
*/
class XML_HTMLSax extends Pear {
    /**
    * Instance of concrete subclass of XML_HTMLSax_StateParser
    * @var XML_HTMLSax_StateParser
    * @access private
    */
    var $state_parser;

    /**
    * Constructs XML_HTMLSax selecting concrete StateParser subclass
    * depending on PHP version being used as well as setting the default
    * NullHandler for all callbacks<br />
    * <b>Example:</b>
    * <pre>
    * $myHandler = & new MyHandler();
    * $parser = new XML_HTMLSax();
    * $parser->set_object($myHandler);
    * $parser->set_option('XML_OPTION_CASE_FOLDING');
    * $parser->set_element_handler('myOpenHandler','myCloseHandler');
    * $parser->set_data_handler('myDataHandler');
    * $parser->parser($xml);
    * </pre>
    * @access public
    */
    function XML_HTMLSax() {
        if (version_compare(phpversion(), '4.3', 'ge')) {
            $this->state_parser =& new XML_HTMLSax_StateParser_Gtet430($this);
        } else {
            $this->state_parser =& new XML_HTMLSax_StateParser_Lt430($this);
        }
        $nullhandler =& new XML_HTMLSax_NullHandler();
        $this->set_object($nullhandler);
        $this->set_element_handler('DoNothing', 'DoNothing');
        $this->set_data_handler('DoNothing');
        $this->set_pi_handler('DoNothing');
        $this->set_jasp_handler('DoNothing');
        $this->set_escape_handler('DoNothing');
    }

    /**
    * Sets the user defined handler object. Returns a PEAR Error
    * if supplied argument is not an object.
    * @param object handler object containing SAX callback methods
    * @access public
    * @return mixed
    */
    function set_object(&$object) {
        if ( is_object($object) ) {
            $this->state_parser->handler_default =& $object;
            return true;
        } else {
            return $this->raiseError('XML_HTMLSax::set_object requires '.
                'an object instance');
        }
    }

    /**
    * Sets a parser option. Returns a PEAR Error if option is invalid<br />
    * <b>Available options:</b>
    * <ul>
    * <li>XML_OPTION_TRIM_DATA_NODES: trim whitespace off the beginning
    * and end of data passed to the data handler</li>
    * <li>XML_OPTION_LINEFEED_BREAK: linefeeds result in additional data
    * handler calls</li>
    * <li>XML_OPTION_TAB_BREAK: tabs result in additional data handler
    * calls</li>
    * <li>XML_OPTION_ENTIES_UNPARSED: XML entities are returned as
    * seperate data handler calls in unparsed form</li>
    * <li>XML_OPTION_ENTIES_PARSED: (PHP 4.3.0+ only) XML entities are
    * returned as seperate data handler calls and are parsed with 
    * PHP's html_entity_decode() function</li>
    * </ul>
    * @param string name of parser option
    * @param int (optional) 1 to switch on, 0 for off
    * @access public
    * @return boolean
    */
    function set_option($name, $value=1) {
        if ( array_key_exists($name,$this->state_parser->parser_options) ) {
            $this->state_parser->parser_options[$name] = $value;
            return true;
        } else {
            return $this->raiseError('XML_HTMLSax::set_option('.$name.') illegal');
        }
    }

    /**
    * Sets the data handler method which deals with the contents of XML
    * elements.<br />
    * The handler method must accept two arguments, the first being an
    * instance of XML_HTMLSax and the second being the contents of an
    * XML element e.g.
    * <pre>
    * function myDataHander(& $parser,$data){}
    * </pre>
    * @param string name of method
    * @access public
    * @return void
    * @see set_object
    */
    function set_data_handler($data_method) {
        $this->state_parser->handler_object_data =& $this->state_parser->handler_default;
        $this->state_parser->handler_method_data = $data_method;
    }

    /**
    * Sets the open and close tag handlers
    * <br />The open handler method must accept three arguments; the parser,
    * the tag name and an array of attributes e.g.
    * <pre>
    * function myOpenHander(& $parser,$tagname,$attrs=array()){}
    * </pre>
    * The close handler method must accept two arguments; the parser and
    * the tag name e.g.
    * <pre>
    * function myCloseHander(& $parser,$tagname){}
    * </pre>
    * @param string name of open method
    * @param string name of close method
    * @access public
    * @return void
    * @see set_object
    */
    function set_element_handler($opening_method, $closing_method) {
        $this->state_parser->handler_object_element =& $this->state_parser->handler_default;
        $this->state_parser->handler_method_opening = $opening_method;
        $this->state_parser->handler_method_closing = $closing_method;
    }

    /**
    * Sets the processing instruction handler method e.g. for PHP open
    * and close tags<br />
    * The handler method must accept three arguments; the parser, the
    * PI target and data inside the PI
    * <pre>
    * function myPIHander(& $parser,$target, $data){}
    * </pre>
    * @param string name of method
    * @access public
    * @return void
    * @see set_object
    */
    function set_pi_handler($pi_method) {
        $this->state_parser->handler_object_pi =& $this->state_parser->handler_default;
        $this->state_parser->handler_method_pi = $pi_method;
    }

    /**
    * Sets the XML escape handler method e.g. for comments and doctype
    * declarations<br />
    * The handler method must accept two arguments; the parser and the
    * contents of the escaped section
    * <pre>
    * function myEscapeHander(& $parser, $data){}
    * </pre>
    * @param string name of method
    * @access public
    * @return void
    * @see set_object
    */
    function set_escape_handler($escape_method) {
        $this->state_parser->handler_object_escape =& $this->state_parser->handler_default;
        $this->state_parser->handler_method_escape = $escape_method;
    }

    /**
    * Sets the JSP/ASP markup handler<br />
    * The handler method must accept two arguments; the parser and
    * body of the JASP tag
    * <pre>
    * function myJaspHander(& $parser, $data){}
    * </pre>
    * @param string name of method
    * @access public
    * @return void
    * @see set_object
    */
    function set_jasp_handler ($jasp_method) {
        $this->state_parser->handler_object_jasp =& $this->state_parser->handler_default;
        $this->state_parser->handler_method_jasp = $jasp_method;
    }

    /**
    * Returns the current string position of the "cursor" inside the XML
    * document
    * <br />Intended for use from within a user defined handler called
    * via the $parser reference e.g.
    * <pre>
    * function myDataHandler(& $parser,$data) {
    *     echo( 'Current position: '.$parser->get_current_position() );
    * }
    * </pre>
    * @access public
    * @return int
    * @see get_length
    */
    function get_current_position() {
        return $this->state_parser->position;
    }

    /**
    * Returns the string length of the XML document being parsed
    * @access public
    * @return int
    */
    function get_length() {
        return $this->state_parser->length;
    }

    /**
    * Start parsing some XML
    * @param string XML document
    * @access public
    * @return void
    */
    function parse($data) {
        $this->state_parser->parse($data);
    }
}
?>