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+<?php
+/* vim: set expandtab tabstop=4 shiftwidth=4: */
+//
+// +----------------------------------------------------------------------+
+// | PHP Version 4 |
+// +----------------------------------------------------------------------+
+// | Copyright (c) 1997-2002 The PHP Group |
+// +----------------------------------------------------------------------+
+// | This source file is subject to version 2.02 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 2005/12/22 11:09:09 weizhuo Exp $
+//
+/**
+* Main parser components
+* @package System.Security.SafeHtml
+* @version $Id: HTMLSax3.php,v 1.2 2005/12/22 11:09:09 weizhuo Exp $
+*/
+/**
+* Required classes
+*/
+
+require_once(dirname(__FILE__).'/HTMLSax3/States.php');
+require_once(dirname(__FILE__).'/HTMLSax3/Decorators.php');
+
+/**
+* Base State Parser
+* @package System.Security.SafeHtml
+* @access protected
+* @abstract
+*/
+class TSax3_StateParser {
+ /**
+ * Instance of user front end class to be passed to callbacks
+ * @var TSax3
+ * @access private
+ */
+ public $htmlsax;
+ /**
+ * User defined object for handling elements
+ * @var object
+ * @access private
+ */
+ public $handler_object_element;
+ /**
+ * User defined open tag handler method
+ * @var string
+ * @access private
+ */
+ public $handler_method_opening;
+ /**
+ * User defined close tag handler method
+ * @var string
+ * @access private
+ */
+ public $handler_method_closing;
+ /**
+ * User defined object for handling data in elements
+ * @var object
+ * @access private
+ */
+ public $handler_object_data;
+ /**
+ * User defined data handler method
+ * @var string
+ * @access private
+ */
+ public $handler_method_data;
+ /**
+ * User defined object for handling processing instructions
+ * @var object
+ * @access private
+ */
+ public $handler_object_pi;
+ /**
+ * User defined processing instruction handler method
+ * @var string
+ * @access private
+ */
+ public $handler_method_pi;
+ /**
+ * User defined object for handling JSP/ASP tags
+ * @var object
+ * @access private
+ */
+ public $handler_object_jasp;
+ /**
+ * User defined JSP/ASP handler method
+ * @var string
+ * @access private
+ */
+ public $handler_method_jasp;
+ /**
+ * User defined object for handling XML escapes
+ * @var object
+ * @access private
+ */
+ public $handler_object_escape;
+ /**
+ * User defined XML escape handler method
+ * @var string
+ * @access private
+ */
+ public $handler_method_escape;
+ /**
+ * User defined handler object or NullHandler
+ * @var object
+ * @access private
+ */
+ public $handler_default;
+ /**
+ * Parser options determining parsing behavior
+ * @var array
+ * @access private
+ */
+ protected $parser_options = array();
+ /**
+ * XML document being parsed
+ * @var string
+ * @access private
+ */
+ protected $rawtext;
+ /**
+ * Position in XML document relative to start (0)
+ * @var int
+ * @access private
+ */
+ protected $position;
+ /**
+ * Length of the XML document in characters
+ * @var int
+ * @access private
+ */
+ protected $length;
+ /**
+ * Array of state objects
+ * @var array
+ * @access private
+ */
+ protected $State = array();
+
+ const TSAX3_STATE_STOP = 0;
+ const TSAX3_STATE_START = 1;
+ const TSAX3_STATE_TAG = 2;
+ const TSAX3_STATE_OPENING_TAG = 3;
+ const TSAX3_STATE_CLOSING_TAG = 4;
+ const TSAX3_STATE_ESCAPE = 6;
+ const TSAX3_STATE_JASP = 7;
+ const TSAX3_STATE_PI = 8;
+
+ /**
+ * Constructs TSax3_StateParser setting up states
+ * @var TSax3 instance of user front end class
+ * @access protected
+ */
+ protected function __construct($htmlsax) {
+ $this->htmlsax = $htmlsax;
+ $this->State[self::TSAX3_STATE_START] = new TSax3_StartingState();
+
+ $this->State[self::TSAX3_STATE_CLOSING_TAG] = new TSax3_ClosingTagState();
+ $this->State[self::TSAX3_STATE_TAG] = new TSax3_TagState();
+ $this->State[self::TSAX3_STATE_OPENING_TAG] = new TSax3_OpeningTagState();
+
+ $this->State[self::TSAX3_STATE_PI] = new TSax3_PiState();
+ $this->State[self::TSAX3_STATE_JASP] = new TSax3_JaspState();
+ $this->State[self::TSAX3_STATE_ESCAPE] = new TSax3_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 TSax3_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 TSax3_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 TSax3_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 TSax3_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 TSax3_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 TSax3_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 TSax3_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 = self::TSAX3_STATE_START) {
+ do {
+ $state = $this->State[$state]->parse($this);
+ } while ($state != self::TSAX3_STATE_STOP &&
+ $this->position < $this->length);
+ }
+}
+
+/**
+* Parser for PHP Versions below 4.3.0. Uses a slower parsing mechanism than
+* the equivalent PHP 4.3.0+ subclass of StateParser
+* @package System.Security.SafeHtml
+* @access protected
+* @see TSax3_StateParser_Gtet430
+*/
+class TSax3_StateParser_Lt430 extends TSax3_StateParser {
+ /**
+ * Constructs TSax3_StateParser_Lt430 defining available
+ * parser options
+ * @var TSax3 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;
+ $this->parser_options['XML_OPTION_STRIP_ESCAPES'] = 0;
+ //var_dump($this->parser_options);
+ }
+
+ /**
+ * 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 = $this->position;
+ while ($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 System.Security.SafeHtml
+* @access protected
+* @see TSax3_StateParser_Lt430
+*/
+class TSax3_StateParser_Gtet430 extends TSax3_StateParser {
+ /**
+ * Constructs TSax3_StateParser_Gtet430 defining available
+ * parser options
+ * @var TSax3 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 System.Security.SafeHtml
+* @access protected
+*/
+class TSax3_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 System.Security.SafeHtml
+* @access public
+*/
+class TSax3 {
+ /**
+ * Instance of concrete subclass of TSax3_StateParser
+ * @var TSax3_StateParser
+ * @access private
+ */
+ private $state_parser;
+
+ /**
+ * Constructs TSax3 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 TSax3();
+ * $parser->set_object($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() {
+ if (version_compare(phpversion(), '4.3', 'ge')) {
+ $this->state_parser = new TSax3_StateParser_Gtet430($this);
+ } else {
+ $this->state_parser = new TSax3_StateParser_Lt430($this);
+ }
+ $nullhandler = new TSax3_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 =& $object;
+ return true;
+ } else {
+ require_once('PEAR.php');
+ PEAR::raiseError('TSax3::set_object requires '.
+ 'an object instance');
+ }
+ }
+
+ /**
+ * Sets a parser option. By default all options are switched off.
+ * Returns a PEAR Error if option is invalid<br />
+ * <b>Available options:</b>
+ * <ul>
+ * <li>XML_OPTION_TRIM_DATA_NODES: trim whitespace off the beginning
+ * and end of data passed to the data handler</li>
+ * <li>XML_OPTION_LINEFEED_BREAK: linefeeds result in additional data
+ * handler calls</li>
+ * <li>XML_OPTION_TAB_BREAK: tabs result in additional data handler
+ * calls</li>
+ * <li>XML_OPTION_ENTITIES_UNPARSED: XML entities are returned as
+ * seperate data handler calls in unparsed form</li>
+ * <li>XML_OPTION_ENTITIES_PARSED: (PHP 4.3.0+ only) XML entities are
+ * returned as seperate data handler calls and are parsed with
+ * PHP's html_entity_decode() function</li>
+ * <li>XML_OPTION_STRIP_ESCAPES: strips out the -- -- comment markers
+ * or CDATA markup inside an XML escape, if found.</li>
+ * </ul>
+ * To get HTMLSax to behave in the same way as the native PHP SAX parser,
+ * using it's default state, you need to switch on XML_OPTION_LINEFEED_BREAK,
+ * XML_OPTION_ENTITIES_PARSED and XML_OPTION_CASE_FOLDING
+ * @param string name of parser option
+ * @param int (optional) 1 to switch on, 0 for off
+ * @access public
+ * @return boolean
+ */
+ function set_option($name, $value=1) {
+ if ( array_key_exists($name,$this->state_parser->parser_options) ) {
+ $this->state_parser->parser_options[$name] = $value;
+ return true;
+ } else {
+ require_once('PEAR.php');
+ PEAR::raiseError('TSax3::set_option('.$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 TSax3 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);
+ }
+}
+?> \ No newline at end of file
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