[1.7.0] New compact syntax for AttrDef objects that can be used to instantiate new objects via make()

- Implemented make() for Enum and Bool
- Migrate classes over to this new syntax
- Add AttrDef_HTML_Bool unit test

git-svn-id: http://htmlpurifier.org/svnroot/htmlpurifier/trunk@1088 48356398-32a2-884e-a903-53898d9a118a

library/HTMLPurifier/AttrDef/Enum.php

@@ -45,6 +45,15 @@ class HTMLPurifier_AttrDef_Enum extends HTMLPurifier_AttrDef
         return $result ? $string : false;
     }
     
+    /**
+     * @param $string In form of comma-delimited list of case-insensitive
+     *      valid values. Example: "foo,bar,baz"
+     */
+    function make($string) {
+        $values = explode(',', $string);
+        return new HTMLPurifier_AttrDef_Enum($values);
+    }
+    
 }
 
 ?>