Re: Ternary operator?

Ok, somewhat on subject what about short circuit evaluation?

[#if true || false ]
[#if false && true]

not until 2.4 also?


________________________________________
From: [email protected] [[email protected]] On Behalf Of Daniel Dekany [[email protected]]
Sent: Wednesday, May 07, 2008 7:52 PM
To: FreeMarker-user
Subject: Re: [FreeMarker-user] Ternary operator?

Wednesday, May 7, 2008, 10:04:21 PM, Newman, John W wrote:

> Hi,
>
> Just wondering what, if any, plans to support or existing support
> we have for the useful Boolean ? expr : expr construct…
>
> Currently I’m stuck with this 5 liner
>
> [#if pageNumber - numPagesToShow > 0]
>       [#assign firstPage = pageNumber – numPagesToShow /]
> [#else]
>       [#assign firstPage = 1 /]
> [/#if]
>
> Could be written as
>
> [#assign firstPage = pageNumber - numPagesToShow > 0 ? pageNumber - numPagesToShow : 1 /]
>
>
> Any plans to support this type of thing in the future?  Can I
> achieve this using something else now?  No big deal, just a bit more terse which is generally good.

The C/Java ternary operator is not really compatible with the FTL
syntax. However, starting from 2.4 we have LazilyEvaluatableArguments
feature, which would allow the implementation of the ternary operator
as a built-in, like: theCondition?iif(whenTrue, whenFalse).

> And the ++ and -- operators would be nice if supported also.

I would allow those only with #set. Like [#set x = x + 1] would be
equivalent with [#set x += 1] and [#set x++], where the += or ++ must
be the top-level (root) operator in the parse tree.

--
Best regards,
 Daniel Dekany


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