Manually work around PEARSax3 E_STRICT errors.

Previously, my development environment was not running the PEARSax3
tests because my environment was set to E_STRICT error handling, and
thus the tests were skipped.  Relax this requirement by making the
wrapper class E_STRICT safe.  This introduces a few failing tests.

Also update TODO and add another fresh test.

Signed-off-by: Edward Z. Yang <ezyang@mit.edu>

TODO

@@ -27,6 +27,7 @@ Things to do as soon as possible:
  - Make flashvars work
  - Inputs don't do the right thing with submit
  - Fix "<.<" bug (trailing < is removed if not EOD)
+ - http://htmlpurifier.org/phorum/read.php?5,2267,4308#msg-4308
 
 FUTURE VERSIONS
 ---------------

library/HTMLPurifier/Lexer/PEARSax3.php

@@ -27,12 +27,16 @@ class HTMLPurifier_Lexer_PEARSax3 extends HTMLPurifier_Lexer
      */
     protected $tokens = array();
 
+    private $parent_handler;
+
     public function tokenizeHTML($string, $config, $context) {
 
         $this->tokens = array();
 
         $string = $this->normalize($string, $config, $context);
 
+        $this->parent_handler = set_error_handler(array($this, 'muteStrictErrorHandler'));
+
         $parser = new XML_HTMLSax3();
         $parser->set_object($this);
         $parser->set_element_handler('openHandler','closeHandler');
@@ -44,6 +48,8 @@ class HTMLPurifier_Lexer_PEARSax3 extends HTMLPurifier_Lexer
 
         $parser->parse($string);
 
+        restore_error_handler();
+
         return $this->tokens;
 
     }
@@ -101,6 +107,14 @@ class HTMLPurifier_Lexer_PEARSax3 extends HTMLPurifier_Lexer
         return true;
     }
 
+    /**
+     * An error handler that mutes strict errors
+     */
+    public function muteStrictErrorHandler($errno, $errstr, $errfile=null, $errline=null, $errcontext=null) {
+        if ($errno == E_STRICT) return;
+        return call_user_func($this->parent_handler, $errno, $errstr, $errfile, $errline, $errcontext);
+    }
+
 }
 
 // vim: et sw=4 sts=4

tests/HTMLPurifier/LexerTest.php

@@ -7,12 +7,7 @@ class HTMLPurifier_LexerTest extends HTMLPurifier_Harness
 
     public function __construct() {
         parent::__construct();
-        // E_STRICT = 2048, int used for PHP4 compat: this check disables
-        // PEAR if PHP 5 strict mode is on, since the class is not strict safe
-        if (
-            $GLOBALS['HTMLPurifierTest']['PEAR'] &&
-            ((error_reporting() & 2048) != 2048) // ought to be a better way
-        ) {
+        if ($GLOBALS['HTMLPurifierTest']['PEAR']) {
             require_once 'HTMLPurifier/Lexer/PEARSax3.php';
             $this->_has_pear = true;
         }
@@ -677,6 +672,17 @@ div {}
         );
     }
 
+    function test_tokenizeHTML_() {
+        $this->assertTokenization(
+            '<a><img /></a>',
+            array(
+                new HTMLPurifier_Token_Start('a'),
+                new HTMLPurifier_Token_Empty('img'),
+                new HTMLPurifier_Token_End('a'),
+            )
+        );
+    }
+
     /*
 
     function test_tokenizeHTML_() {