[Zope] The XML-dtml notation "&dtml-variable;"

[Andrew]

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