[stringtemplate-interest] Fail on undefined property

[Terence Parr]

Yeah, I hear that. On the other hand, we already have syntax for this

<x> is mandatory
<if(x)><x><endif> is not mandatory

  verbose, but functionality  already exists ;)

T
On Jul 31, 2009, at 1:11 PM, John D. Mitchell wrote:

> On Jul 31, 2009, at 13:02 , Terence Parr wrote:
>> On Jul 31, 2009, at 1:01 PM, John D. Mitchell wrote:
>>> I haven't followed this thread too closely but in terms of
>>> optionality, one trick would be to add syntactic support for
>>> something like:
>>> <x?> or <x!>
>>
>> that could work but I would prefer to have it on the parameter
>> definitions not the usage:
>>
>> mytemplate(firstname, lastname?) ::= "..."
>
> FWIW, I'm more on the side of "at the point of usage" because I  
> think having the fact be very explicit is a good thing. I.e., when  
> one is reading through the template, having it jump out as different  
> behavior is helpful -- having the same looking thing with two  
> different behaviors just bothers me, I guess.
>
> Hope this helps,
> John
>
>