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Editing: HTMLSax3.php

<?php
/* vim: set expandtab tabstop=4 shiftwidth=4: */
//
// +----------------------------------------------------------------------+
// | PHP Version 4 |
// +----------------------------------------------------------------------+
// | Copyright (c) 1997-2002 The PHP Group |
// +----------------------------------------------------------------------+
// | This source file is subject toversion 3.0 of the PHP license, |
// | that is bundled with this package in the file LICENSE, and is |
// | available at through the world-wide-web at |
// | http://www.php.net/license/3_0.txt. |
// | If you did not receive a copy of the PHP license and are unable to |
// | obtain it through the world-wide-web, please send a note to |
// | license@php.net so we can mail you a copy immediately. |
// +----------------------------------------------------------------------+
// | Authors: Alexander Zhukov <alex@veresk.ru> Original port from Python |
// | Authors: Harry Fuecks <hfuecks@phppatterns.com> Port to PEAR + more |
// | Authors: Many @ Sitepointforums Advanced PHP Forums |
// +----------------------------------------------------------------------+
//
// $Id: HTMLSax3.php,v 1.2 2007/10/29 21:41:34 hfuecks Exp $
//
/**
 * Main parser components
 * @package XML_HTMLSax3
 * @version $Id: HTMLSax3.php,v 1.2 2007/10/29 21:41:34 hfuecks Exp $
 */
/**
 * Required classes
 */
if (!defined('XML_HTMLSAX3')) {
	define('XML_HTMLSAX3', 'XML/');
}
require_once(XML_HTMLSAX3 . 'HTMLSax3/States.php');
require_once(XML_HTMLSAX3 . 'HTMLSax3/Decorators.php');

/**
 * Base State Parser
 * @package XML_HTMLSax3
 * @access protected
 * @abstract
 */
class XML_HTMLSax3_StateParser {
	/**
	 * Instance of user front end class to be passed to callbacks
	 * @var XML_HTMLSax3
	 * @access private
	 */
	var $htmlsax;
	/**
	 * User defined object for handling elements
	 * @var object
	 * @access private
	 */
	var $handler_object_element;
	/**
	 * User defined open tag handler method
	 * @var string
	 * @access private
	 */
	var $handler_method_opening;
	/**
	 * User defined close tag handler method
	 * @var string
	 * @access private
	 */
	var $handler_method_closing;
	/**
	 * User defined object for handling data in elements
	 * @var object
	 * @access private
	 */
	var $handler_object_data;
	/**
	 * User defined data handler method
	 * @var string
	 * @access private
	 */
	var $handler_method_data;
	/**
	 * User defined object for handling processing instructions
	 * @var object
	 * @access private
	 */
	var $handler_object_pi;
	/**
	 * User defined processing instruction handler method
	 * @var string
	 * @access private
	 */
	var $handler_method_pi;
	/**
	 * User defined object for handling JSP/ASP tags
	 * @var object
	 * @access private
	 */
	var $handler_object_jasp;
	/**
	 * User defined JSP/ASP handler method
	 * @var string
	 * @access private
	 */
	var $handler_method_jasp;
	/**
	 * User defined object for handling XML escapes
	 * @var object
	 * @access private
	 */
	var $handler_object_escape;
	/**
	 * User defined XML escape handler method
	 * @var string
	 * @access private
	 */
	var $handler_method_escape;
	/**
	 * User defined handler object or NullHandler
	 * @var object
	 * @access private
	 */
	var $handler_default;
	/**
	 * Parser options determining parsing behavior
	 * @var array
	 * @access private
	 */
	var $parser_options = [];
	/**
	 * XML document being parsed
	 * @var string
	 * @access private
	 */
	var $rawtext;
	/**
	 * Position in XML document relative to start (0)
	 * @var int
	 * @access private
	 */
	var $position;
	/**
	 * Length of the XML document in characters
	 * @var int
	 * @access private
	 */
	var $length;
	/**
	 * Array of state objects
	 * @var array
	 * @access private
	 */
	var $State = [];

/**
	 * Constructs XML_HTMLSax3_StateParser setting up states
	 * @var XML_HTMLSax3 instance of user front end class
	 * @access protected
	 */
	function __construct (& $htmlsax) {
		$this->htmlsax = & $htmlsax;
		$this->State[XML_HTMLSAX3_STATE_START] = new XML_HTMLSax3_StartingState();

$this->State[XML_HTMLSAX3_STATE_CLOSING_TAG] = new XML_HTMLSax3_ClosingTagState();
		$this->State[XML_HTMLSAX3_STATE_TAG] = new XML_HTMLSax3_TagState();
		$this->State[XML_HTMLSAX3_STATE_OPENING_TAG] = new XML_HTMLSax3_OpeningTagState();

$this->State[XML_HTMLSAX3_STATE_PI] = new XML_HTMLSax3_PiState();
		$this->State[XML_HTMLSAX3_STATE_JASP] = new XML_HTMLSax3_JaspState();
		$this->State[XML_HTMLSAX3_STATE_ESCAPE] = new XML_HTMLSax3_EscapeState();
	}

/**
	 * Moves the position back one character
	 * @access protected
	 * @return void
	 */
	function unscanCharacter() {
		$this->position -= 1;
	}

/**
	 * Moves the position forward one character
	 * @access protected
	 * @return void
	 */
	function ignoreCharacter() {
		$this->position += 1;
	}

/**
	 * Returns the next character from the XML document or void if at end
	 * @access protected
	 * @return mixed
	 */
	function scanCharacter() {
		if ($this->position < $this->length) {
			return $this->rawtext[$this->position++];
		}
	}

/**
	 * Returns a string from the current position to the next occurance
	 * of the supplied string
	 * @param string string to search until
	 * @access protected
	 * @return string
	 */
	function scanUntilString($string) {
		$start = $this->position;
		$this->position = strpos($this->rawtext, $string, $start);
		if ($this->position === FALSE) {
			$this->position = $this->length;
		}
		return substr($this->rawtext, $start, $this->position - $start);
	}

/**
	 * 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
	 * @abstract
	 */
	function scanUntilCharacters($string) {}

/**
	 * Moves the position forward past any whitespace characters
	 * @access protected
	 * @return void
	 * @abstract
	 */
	function ignoreWhitespace() {}

/**
	 * Begins the parsing operation, setting up any decorators, depending on
	 * parse options invoking _parse() to execute parsing
	 * @param string XML document to parse
	 * @access protected
	 * @return void
	 */
	function parse($data) {
		if ($this->parser_options['XML_OPTION_TRIM_DATA_NODES']==1) {
			$decorator = new XML_HTMLSax3_Trim(
			$this->handler_object_data,
			$this->handler_method_data);
			$this->handler_object_data =& $decorator;
			$this->handler_method_data = 'trimData';
		}
		if ($this->parser_options['XML_OPTION_CASE_FOLDING']==1) {
			$open_decor = new XML_HTMLSax3_CaseFolding(
			$this->handler_object_element,
			$this->handler_method_opening,
			$this->handler_method_closing);
			$this->handler_object_element =& $open_decor;
			$this->handler_method_opening ='foldOpen';
			$this->handler_method_closing ='foldClose';
		}
		if ($this->parser_options['XML_OPTION_LINEFEED_BREAK']==1) {
			$decorator = new XML_HTMLSax3_Linefeed(
			$this->handler_object_data,
			$this->handler_method_data);
			$this->handler_object_data =& $decorator;
			$this->handler_method_data = 'breakData';
		}
		if ($this->parser_options['XML_OPTION_TAB_BREAK']==1) {
			$decorator = new XML_HTMLSax3_Tab(
			$this->handler_object_data,
			$this->handler_method_data);
			$this->handler_object_data =& $decorator;
			$this->handler_method_data = 'breakData';
		}
		if ($this->parser_options['XML_OPTION_ENTITIES_UNPARSED']==1) {
			$decorator = new XML_HTMLSax3_Entities_Unparsed(
			$this->handler_object_data,
			$this->handler_method_data);
			$this->handler_object_data =& $decorator;
			$this->handler_method_data = 'breakData';
		}
		if ($this->parser_options['XML_OPTION_ENTITIES_PARSED']==1) {
			$decorator = new XML_HTMLSax3_Entities_Parsed(
			$this->handler_object_data,
			$this->handler_method_data);
			$this->handler_object_data =& $decorator;
			$this->handler_method_data = 'breakData';
		}
		// Note switched on by default
		if ($this->parser_options['XML_OPTION_STRIP_ESCAPES']==1) {
			$decorator = new XML_HTMLSax3_Escape_Stripper(
			$this->handler_object_escape,
			$this->handler_method_escape);
			$this->handler_object_escape =& $decorator;
			$this->handler_method_escape = 'strip';
		}
		$this->rawtext = $data;
		$this->length = strlen($data);
		$this->position = 0;
		$this->_parse();
	}

/**
	 * Performs the parsing itself, delegating calls to a specific parser
	 * state
	 * @param constant state object to parse with
	 * @access protected
	 * @return void
	 */
	function _parse($state = XML_HTMLSAX3_STATE_START) {
		do {
			$state = $this->State[$state]->parse($this);
		} while ($state != XML_HTMLSAX3_STATE_STOP &&
		$this->position < $this->length);
	}
}

/**
 * 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_HTMLSax3
 * @access protected
 */
class XML_HTMLSax3_StateParser_Gtet430 extends XML_HTMLSax3_StateParser {
	/**
	 * Constructs XML_HTMLSax3_StateParser_Gtet430 defining available
	 * parser options
	 * @var XML_HTMLSax3 instance of user front end class
	 * @access protected
	 */
	function __construct(& $htmlsax) {
		parent::__construct($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;
		$this->parser_options['XML_OPTION_STRIP_ESCAPES'] = 0;
	}
	/**
	 * Returns a string from the current position until the first instance of
	 * one of the characters in the supplied string argument.
	 * @param string string to search until
	 * @access protected
	 * @return string
	 */
	function scanUntilCharacters($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_HTMLSax3
 * @access protected
 */
class XML_HTMLSax3_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_HTMLSax3
 * @access public
 */
class XML_HTMLSax3 {
	/**
	 * Instance of concrete subclass of XML_HTMLSax3_StateParser
	 * @var XML_HTMLSax3_StateParser
	 * @access private
	 */
	var $state_parser;

/**
	 * Constructs XML_HTMLSax3 selecting concrete StateParser subclass
	 * depending on PHP version being used as well as setting the default
	 * NullHandler for all callbacks 
	 * Example:
	 * <pre>
	 * $myHandler = new MyHandler();
	 * $parser = new XML_HTMLSax3();
	 * $parser->set_object($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 __construct() {
		$this->state_parser = new XML_HTMLSax3_StateParser_Gtet430($this);
		$nullhandler = new XML_HTMLSax3_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 {
			require_once('PEAR.php');
			PEAR::raiseError('XML_HTMLSax3::set_object requires '.
				'an object instance');
		}
	}

/**
	 * Sets a parser option. By default all options are switched off.
	 * Returns a PEAR Error if option is invalid 
	 * Available options:
	 * <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_ENTITIES_UNPARSED: XML entities are returned as
	 * seperate data handler calls in unparsed form</li>
	 * <li>XML_OPTION_ENTITIES_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>
	 * <li>XML_OPTION_STRIP_ESCAPES: strips out the -- -- comment markers
	 * or CDATA markup inside an XML escape, if found.</li>
	 * </ul>
	 * To get HTMLSax to behave in the same way as the native PHP SAX parser,
	 * using it's default state, you need to switch on XML_OPTION_LINEFEED_BREAK,
	 * XML_OPTION_ENTITIES_PARSED and XML_OPTION_CASE_FOLDING
	 * @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] = $value;
			return true;
		} else {
			require_once('PEAR.php');
			PEAR::raiseError('XML_HTMLSax3::set_option('.$name.') illegal');
		}
	}

/**
	 * Sets the data handler method which deals with the contents of XML
	 * elements. 
	 * The handler method must accept two arguments, the first being an
	 * instance of XML_HTMLSax3 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
	 * 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 
	 * 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 
	 * 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 
	 * 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
	 * 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);
	}
}