Robert Sneidar wrote:
The problem is, Revolution script is soooo friendly with variable
typing that just passing an undefined variable name as an arguement
to a function will simply pass the variable name as a literal to the
parameter of the called function, so within the function, no matter
what, the value of the parameter will be something. It would be nice
if Revolution did not do that, but I understand they need to be
compatible with prior xCard solutions.
If you set "explicitVariables" in the IDE, you will get errors for
undefined variables (and if you declare the variable as a local within
the handler, then it will be initialized to empty) - so avoiding some of
the difficulties you have to deal with below. Of course, you still can't
distinguish between a variable which is undefined and one which has been
deliberately set to empty :-(
Once inside the function, variableNames and globalNames knows nothing
of a local variable in the calling handler. And there is no way to
distinguish if the parameter passed is the value of an existing
variable, or the literal name of the variable I thought I was passing
it. Revolution is simply being too friendly. Passing the variable as
a reference doesn't help either. The parameter is still resolved to
the value of the passed variable regardless, (which begs the question
"what's the difference?") In short, there is no way for a called
function to tell if a variable belonging to the scope of the calling
script exists or not, and what it is. Until now.
Hmmmm - how about the case of :
on myHandler
local myVar
put "myVar" into myVar
put "myVar" into varName
put theType(myVar, varName) into myType
-- function theType() returns a type of "U" which is wrong
end myHandler
--
Alex Tweedly http://www.tweedly.net
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