[stringtemplate-interest] Fail on undefined property

[Koerner, Ron]

Would a functionality like "fail generation of template if some
variables are undefined" not violate model/view separation?

Actually the model generation should fail and make the decision whether
something is displayable or not.

Regards,
Ron

-----Original Message-----
From: stringtemplate-interest-bounces at antlr.org
[mailto:stringtemplate-interest-bounces at antlr.org] On Behalf Of Terence
Parr
Sent: Friday, July 31, 2009 10:13 PM
To: John D. Mitchell
Cc: String Template
Subject: Re: [stringtemplate-interest] Fail on undefined property

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
>
>

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