[3.1.0] Fixed fatal error in PH5P lexer with invalid tag names

git-svn-id: http://htmlpurifier.org/svnroot/htmlpurifier/trunk@1650 48356398-32a2-884e-a903-53898d9a118a

maintenance/PH5P.patch

@@ -1,5 +1,14 @@
---- C:\Users\Edward\Webs\htmlpurifier\maintenance\PH5P.php	2007-11-04 23:41:49.074543700 -0500
-+++ C:\Users\Edward\Webs\htmlpurifier\maintenance/PH5P.new.php	2007-11-05 00:23:52.839543700 -0500
+--- C:\Users\Edward\Webs\htmlpurifier\maintenance\PH5P.php	2007-11-05 00:01:51.643585000 -0500
++++ C:\Users\Edward\Webs\htmlpurifier\maintenance/PH5P.new.php	2008-04-05 00:26:39.343160000 -0400
+@@ -65,7 +65,7 @@
+ 
+     public function __construct($data) {
+         $data = str_replace("\r\n", "\n", $data);
+-        $date = str_replace("\r", null, $data);
++        $data = str_replace("\r", null, $data);
+ 
+         $this->data = $data;
+         $this->char = -1;
 @@ -211,7 +211,10 @@
          // If nothing is returned, emit a U+0026 AMPERSAND character token.
          // Otherwise, emit the character token that was returned.
@@ -43,7 +52,36 @@
                          $entity = $id;
                          break;
                      }
-@@ -3659,7 +3668,7 @@
+@@ -2084,7 +2093,7 @@
+                     /* Reconstruct the active formatting elements, if any. */
+                     $this->reconstructActiveFormattingElements();
+ 
+-                    $this->insertElement($token);
++                    $this->insertElement($token, true, true);
+                 break;
+             }
+             break;
+@@ -3465,7 +3474,18 @@
+         }
+     }
+ 
+-    private function insertElement($token, $append = true) {
++    private function insertElement($token, $append = true, $check = false) {
++        // Proprietary workaround for libxml2's limitations with tag names
++        if ($check) {
++            // Slightly modified HTML5 tag-name modification,
++            // removing anything that's not an ASCII letter, digit, or hyphen
++            $token['name'] = preg_replace('/[^a-z0-9-]/i', '', $token['name']);
++            // Remove leading hyphens and numbers
++            $token['name'] = ltrim($token['name'], '-0..9');
++            // In theory, this should ever be needed, but just in case
++            if ($token['name'] === '') $token['name'] = 'span'; // arbitrary generic choice
++        }
++        
+         $el = $this->dom->createElement($token['name']);
+ 
+         foreach($token['attr'] as $attr) {
+@@ -3659,7 +3679,7 @@
          }
      }
  
@@ -52,7 +90,7 @@
          /* When the steps below require the UA to generate implied end tags,
          then, if the current node is a dd element, a dt element, an li element,
          a p element, a td element, a th  element, or a tr element, the UA must
-@@ -3673,7 +3682,8 @@
+@@ -3673,7 +3693,8 @@
          }
      }