<?php /** * Proof-of-concept lexer that uses the PEAR package XML_HTMLSax3 to parse HTML. * * PEAR, not suprisingly, also has a SAX parser for HTML. I don't know * very much about implementation, but it's fairly well written. However, that * abstraction comes at a price: performance. You need to have it installed, * and if the API changes, it might break our adapter. Not sure whether or not * it's UTF-8 aware, but it has some entity parsing trouble (in all areas, * text and attributes). * * Quite personally, I don't recommend using the PEAR class, and the defaults * don't use it. The unit tests do perform the tests on the SAX parser too, but * whatever it does for poorly formed HTML is up to it. * * @todo Generalize so that XML_HTMLSax is also supported. * * @warning Entity-resolution inside attributes is broken. */ class HTMLPurifier_Lexer_PEARSax3 extends HTMLPurifier_Lexer { /** * Internal accumulator array for SAX parsers. */ protected $tokens = array(); public function tokenizeHTML($string, $config, $context) { $this->tokens = array(); $string = $this->normalize($string, $config, $context); $parser = new XML_HTMLSax3(); $parser->set_object($this); $parser->set_element_handler('openHandler','closeHandler'); $parser->set_data_handler('dataHandler'); $parser->set_escape_handler('escapeHandler'); // doesn't seem to work correctly for attributes $parser->set_option('XML_OPTION_ENTITIES_PARSED', 1); $parser->parse($string); return $this->tokens; } /** * Open tag event handler, interface is defined by PEAR package. */ public function openHandler(&$parser, $name, $attrs, $closed) { // entities are not resolved in attrs foreach ($attrs as $key => $attr) { $attrs[$key] = $this->parseData($attr); } if ($closed) { $this->tokens[] = new HTMLPurifier_Token_Empty($name, $attrs); } else { $this->tokens[] = new HTMLPurifier_Token_Start($name, $attrs); } return true; } /** * Close tag event handler, interface is defined by PEAR package. */ public function closeHandler(&$parser, $name) { // HTMLSax3 seems to always send empty tags an extra close tag // check and ignore if you see it: // [TESTME] to make sure it doesn't overreach if ($this->tokens[count($this->tokens)-1] instanceof HTMLPurifier_Token_Empty) { return true; } $this->tokens[] = new HTMLPurifier_Token_End($name); return true; } /** * Data event handler, interface is defined by PEAR package. */ public function dataHandler(&$parser, $data) { $this->tokens[] = new HTMLPurifier_Token_Text($data); return true; } /** * Escaped text handler, interface is defined by PEAR package. */ public function escapeHandler(&$parser, $data) { if (strpos($data, '--') === 0) { $this->tokens[] = new HTMLPurifier_Token_Comment($data); } // CDATA is handled elsewhere, but if it was handled here: //if (strpos($data, '[CDATA[') === 0) { // $this->tokens[] = new HTMLPurifier_Token_Text( // substr($data, 7, strlen($data) - 9) ); //} return true; } } // vim: et sw=4 sts=4