+ "Perform preliminary non-db specific lookup checks and conversions"
+ if lookup_type == 'endswith':
+ return "*%s" % escape_ldap_filter(value)
+ elif lookup_type == 'startswith':
+ return "%s*" % escape_ldap_filter(value)
+ elif lookup_type in ['contains', 'icontains']:
+ return "*%s*" % escape_ldap_filter(value)
+ elif lookup_type == 'exact':
+ return escape_ldap_filter(value)
+ elif lookup_type == 'in':
+ return [escape_ldap_filter(v) for v in value]
+
+ raise TypeError("CharField has invalid lookup: %s" % lookup_type)
+