Generalize IDAccumulator into AttrContext. Modify tests and classes accordingly. Also, this allows us to make the validate() parameters uniform among all AttrDef subclasses.

git-svn-id: http://htmlpurifier.org/svnroot/htmlpurifier/trunk@212 48356398-32a2-884e-a903-53898d9a118a

library/HTMLPurifier/AttrDef.php

@@ -1,11 +1,13 @@
 <?php
 
+require_once 'HTMLPurifier/AttrContext.php';
+
 // AttrDef = Attribute Definition
 class HTMLPurifier_AttrDef
 {
     function HTMLPurifier_AttrDef() {}
     
-    function validate($string, $config = null) {
+    function validate($string, $config, &$context) {
         trigger_error('Cannot call abstract function', E_USER_ERROR);
     }