Christopher Petrilli <petrilli@digicool.com> said:

On 11/4/99 10:57 AM, Andrew at andrew@eventera.com wrote:

...

How is this different from the following?

<dtml-var foo null="default-value">

Null is different than missing :-) Missing is the existence of the variable at all, Null is that it's "empty".

Oooohhhhhh! That is a GREAT idea. Here is a patch. Drew *** DT_Var.py Thu Nov 04 14:00:22 1999 --- DT_Var.py.save Thu Nov 04 13:34:48 1999 *************** *** 212,218 **** capitalize=1, spacify=1, null='', fmt='s', size=0, etc='...', thousands_commas=1, html_quote=1, url_quote=1, sql_quote=1, ! newline_to_br=1, default='') self.args=args self.modifiers=tuple( --- 212,218 ---- capitalize=1, spacify=1, null='', fmt='s', size=0, etc='...', thousands_commas=1, html_quote=1, url_quote=1, sql_quote=1, ! newline_to_br=1) self.args=args self.modifiers=tuple( *************** *** 234,253 **** def render(self, md): name=self.__name__ val=self.expr ! args=self.args ! have_arg=args.has_key ! ! if val is None: ! try: ! val = md[name] ! except KeyError: ! if have_arg('default'): ! return args['default'] ! else: ! raise KeyError else: val=val.eval(md) ! __traceback_info__=name, val, args --- 234,246 ---- def render(self, md): name=self.__name__ val=self.expr ! if val is None: ! val = md[name] else: val=val.eval(md) ! ! args=self.args ! have_arg=args.has_key __traceback_info__=name, val, args