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/plugins/vjCommentPlugin/lib/tools/htmlpurifier/library/HTMLPurifier/Lexer/PEARSax3.php

https://bitbucket.org/Kudlaty/360kdw
PHP | 139 lines | 70 code | 21 blank | 48 comment | 13 complexity | 952281bcdb7bca94a6a69bb0fcb6a475 MD5 | raw file
  1<?php
  2
  3/**
  4 * Proof-of-concept lexer that uses the PEAR package XML_HTMLSax3 to parse HTML.
  5 *
  6 * PEAR, not suprisingly, also has a SAX parser for HTML.  I don't know
  7 * very much about implementation, but it's fairly well written.  However, that
  8 * abstraction comes at a price: performance. You need to have it installed,
  9 * and if the API changes, it might break our adapter. Not sure whether or not
 10 * it's UTF-8 aware, but it has some entity parsing trouble (in all areas,
 11 * text and attributes).
 12 *
 13 * Quite personally, I don't recommend using the PEAR class, and the defaults
 14 * don't use it. The unit tests do perform the tests on the SAX parser too, but
 15 * whatever it does for poorly formed HTML is up to it.
 16 *
 17 * @todo Generalize so that XML_HTMLSax is also supported.
 18 *
 19 * @warning Entity-resolution inside attributes is broken.
 20 */
 21
 22class HTMLPurifier_Lexer_PEARSax3 extends HTMLPurifier_Lexer
 23{
 24
 25    /**
 26     * Internal accumulator array for SAX parsers.
 27     */
 28    protected $tokens = array();
 29    protected $last_token_was_empty;
 30
 31    private $parent_handler;
 32    private $stack = array();
 33
 34    public function tokenizeHTML($string, $config, $context) {
 35
 36        $this->tokens = array();
 37        $this->last_token_was_empty = false;
 38
 39        $string = $this->normalize($string, $config, $context);
 40
 41        $this->parent_handler = set_error_handler(array($this, 'muteStrictErrorHandler'));
 42
 43        $parser = new XML_HTMLSax3();
 44        $parser->set_object($this);
 45        $parser->set_element_handler('openHandler','closeHandler');
 46        $parser->set_data_handler('dataHandler');
 47        $parser->set_escape_handler('escapeHandler');
 48
 49        // doesn't seem to work correctly for attributes
 50        $parser->set_option('XML_OPTION_ENTITIES_PARSED', 1);
 51
 52        $parser->parse($string);
 53
 54        restore_error_handler();
 55
 56        return $this->tokens;
 57
 58    }
 59
 60    /**
 61     * Open tag event handler, interface is defined by PEAR package.
 62     */
 63    public function openHandler(&$parser, $name, $attrs, $closed) {
 64        // entities are not resolved in attrs
 65        foreach ($attrs as $key => $attr) {
 66            $attrs[$key] = $this->parseData($attr);
 67        }
 68        if ($closed) {
 69            $this->tokens[] = new HTMLPurifier_Token_Empty($name, $attrs);
 70            $this->last_token_was_empty = true;
 71        } else {
 72            $this->tokens[] = new HTMLPurifier_Token_Start($name, $attrs);
 73        }
 74        $this->stack[] = $name;
 75        return true;
 76    }
 77
 78    /**
 79     * Close tag event handler, interface is defined by PEAR package.
 80     */
 81    public function closeHandler(&$parser, $name) {
 82        // HTMLSax3 seems to always send empty tags an extra close tag
 83        // check and ignore if you see it:
 84        // [TESTME] to make sure it doesn't overreach
 85        if ($this->last_token_was_empty) {
 86            $this->last_token_was_empty = false;
 87            return true;
 88        }
 89        $this->tokens[] = new HTMLPurifier_Token_End($name);
 90        if (!empty($this->stack)) array_pop($this->stack);
 91        return true;
 92    }
 93
 94    /**
 95     * Data event handler, interface is defined by PEAR package.
 96     */
 97    public function dataHandler(&$parser, $data) {
 98        $this->last_token_was_empty = false;
 99        $this->tokens[] = new HTMLPurifier_Token_Text($data);
100        return true;
101    }
102
103    /**
104     * Escaped text handler, interface is defined by PEAR package.
105     */
106    public function escapeHandler(&$parser, $data) {
107        if (strpos($data, '--') === 0) {
108            // remove trailing and leading double-dashes
109            $data = substr($data, 2);
110            if (strlen($data) >= 2 && substr($data, -2) == "--") {
111                $data = substr($data, 0, -2);
112            }
113            if (isset($this->stack[sizeof($this->stack) - 1]) &&
114                $this->stack[sizeof($this->stack) - 1] == "style") {
115                $this->tokens[] = new HTMLPurifier_Token_Text($data);
116            } else {
117                $this->tokens[] = new HTMLPurifier_Token_Comment($data);
118            }
119            $this->last_token_was_empty = false;
120        }
121        // CDATA is handled elsewhere, but if it was handled here:
122        //if (strpos($data, '[CDATA[') === 0) {
123        //    $this->tokens[] = new HTMLPurifier_Token_Text(
124        //        substr($data, 7, strlen($data) - 9) );
125        //}
126        return true;
127    }
128
129    /**
130     * An error handler that mutes strict errors
131     */
132    public function muteStrictErrorHandler($errno, $errstr, $errfile=null, $errline=null, $errcontext=null) {
133        if ($errno == E_STRICT) return;
134        return call_user_func($this->parent_handler, $errno, $errstr, $errfile, $errline, $errcontext);
135    }
136
137}
138
139// vim: et sw=4 sts=4