[Opensim-users] LSL Syntax in Opensim - restrictions?

[Justin Clark-Casey]

Ai Austin wrote:
> At 05:54 10/12/2009, rrid Luna <torrid at primforge.com> wrote:
>>>              if( ((c = llList2Float(time,a)) <= ticks) ||
>>> (llGetAgentSize(d = llList2Key(users,a)) == <0.0,0.0,0.0>))
>>>
>> the argument to if contains an assignment (c = llL...) which itself 
>> returns either a Boolean (in the sense of "Success") or the value of 
>> the successfully changed variable in SL-LSL and other languages. In 
>> SL-LSL it behaves like that, and is allowed (although bad style), 
>> but not in Opensim-LSL.
>>
>> You can rewrite it as
>>
>> c = llList2Float(time,a);
>> d = llList2Key(users,a);
>>
>> if (c <= ticks || llGetAgentSize(d) == <0.0 ,0.0 ,0.0>){
> 
> 
> Thank Torrid, that does indeed fix the LSL syntax problem - in fact 
> in a federated window script for the open source "Archer 
> House".   There are some issues with UUIDS of the various window 
> textures to get it working properly, but that is a separate issue. 

There are some general issues with LSL statements that have extra parentheses. 
I fixed one to do with parsing if statements in

http://opensimulator.org/mantis/view.php?id=3874

but there's probably a better generalizable fix for parenthesis related issues. 
  rogerwo suggested that there shouldn't really be a ParenthesisExpression node 
in the LSL parser since the information is already inherently coded within the 
abstract syntax tree.  Unfortunately, I haven't had any time to look at this 
recently (and it's important but below the other important things on my personal 
list :).

-- 
Justin Clark-Casey (justincc)
http://justincc.org
http://twitter.com/justincc