Arithmetic

[Jason van Zyl <jv...@periapt.com>]

Hi,

How about using the #set directive for arithmetic
as well:

#set $foo = 1
#set $foo = $foo + 1
#set $velocity = $distance / $time
#set $value = (($foo / $bar) * $distance) % 5
#set $foo.Bar = ($x - $y) + $z

I have this parsing correctly, and I would
have to implement the same logic for:

#if (($x - $y) + $z > $a)

So it can be reused for setting values as
well.

Comments?

jvz.

-- 

Jason van Zyl
jvanzyl@periapt.com

Re: Arithmetic

[Leon Messerschmidt <le...@opticode.co.za>]

Brilliant!


>Jason van Zyl wrote:
>
> Hi,
> 
> How about using the #set directive for arithmetic
> as well:
> 
> #set $foo = 1
> #set $foo = $foo + 1
> #set $velocity = $distance / $time
> #set $value = (($foo / $bar) * $distance) % 5
> #set $foo.Bar = ($x - $y) + $z
> 
> I have this parsing correctly, and I would
> have to implement the same logic for:
> 
> #if (($x - $y) + $z > $a)
> 
> So it can be reused for setting values as
> well.
> 
> Comments?
> 

Re: Arithmetic

[Travis Low <tr...@dawnstar.org>]

Perfect.  Comments/questions:

- Do you require the parentheses, or will you observe arithmetic precedence and
allow:

#set $value = $foo + $bar * $baz

- To avoid opening a can of worms, I suggest throwing an exception when types
are mixed.  Thus:

#if ($string && ($integer1 - $integer2))

would throw an exception.  Otherwise, you have to decide how to treat "0" in
boolean expressions.

- Since you're moving ahead with development, should I write a spec, or should I
wait and document what you've done at the end?

Travis


Jason van Zyl wrote:
> 
> Hi,
> 
> How about using the #set directive for arithmetic
> as well:
> 
> #set $foo = 1
> #set $foo = $foo + 1
> #set $velocity = $distance / $time
> #set $value = (($foo / $bar) * $distance) % 5
> #set $foo.Bar = ($x - $y) + $z
> 
> I have this parsing correctly, and I would
> have to implement the same logic for:
> 
> #if (($x - $y) + $z > $a)
> 
> So it can be reused for setting values as
> well.
> 
> Comments?