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List:       stringtemplate-interest
Subject:    Re: [stringtemplate-interest] Question on math operations (plus,
From:       Terence Parr <parrt () cs ! usfca ! edu>
Date:       2011-12-03 17:21:03
Message-ID: C0D7DB4B-7741-433C-91A0-98505F9A489D () cs ! usfca ! edu
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Hi. Sorry but ST only displays/formats--it cannot compute, just like printf can't do math.  This is by design.
Ter
On Dec 2, 2011, at 4:46 PM, Jiwon Seo wrote:

> Hi,
> 
> I need to do some simple subtraction inside a template, like
> following. (the reason for this is, it is much simpler to do this in a
> template than in Java and pass an argument to the template).
> 
> <args:{a | argument_<i> and nesting_<length(params)-i>}>
> 
> So, basically I want to be able to compute a number by subtracting an
> index from the length of another attributes ( <length(params) - i> )
> 
> Is there any way I can do something like this?
> 
> The length of the params (in the above example) is limited (like from
> 1 to 5), so if I can use a map which takes a tuple, I can do
> following:
> 
> IndexMap ::= [
>    (5, 1) : 4,
>    (5, 2) : 3,
>    (5, 3) : 2,
>   ...
>    (3, 1): 2,
>   ...
>    (2, 1): 1,
>    default: "ERROR!!!"
> ]
> 
> and use it like this:
> 
> <args:{a | argument_<i> and nesting_<IndexMap.(params,i)>}>
> 
> But it seems like it is not supported either.
> 
> Thanks,
> 
> -Jiwon
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