Re: Scary fun with variables scopes.

[James Holmes]

You can, of course, protect yourself from this:


 Session Variable evaluated true.
 

On 10/5/07, Ian Skinner <[EMAIL PROTECTED]> wrote:
> Give this a try if you have a moment.
>
> Put this code in a file test.cfm.  Note: no  tag.
>
> Session.test: #session.test#
> 
> Session Variable evaluated true.
> 
>
> Then call the page with this url:  http://aDomain/test.cfm?session.test=true
>
> Is this discussed or documented somewhere?

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Re: Scary fun with variables scopes.

[Janet MacKay]

>You will see that the exact same phenomenon occurs; when the struct already
>exists, CF cannot implicitly create it and creates a variable with the name
>provided.

It doesn't seem to matter whether a structure exists or not. 

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Re: Scary fun with variables scopes.

[Claude Schneegans]

 >>CF cannot create it so it treats it as a
variable "session.test" that it places into the URL scope.

And this is what is inconsistent, since a variable cannot have a dot in 
its name.

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RE: Scary fun with variables scopes.

[Rich]

>  >>I don't think its a structure.  Just a variable name with a "." in it.
> 
> But this is unconsistent with the way CF really works:
> Try 
> 
> 
> CFDUMP shows that test is a structure with a variable " test", not a
> variable "test.test"

The way CF "really works" in the example you provided is implicitly creating
a structure when you use that syntax.  In the previous example, since
session is an existing structure CF cannot create it so it treats it as a
variable "session.test" that it places into the URL scope.

You can test this behavior by running the code below:

 




If you place these in a file (test.cfm) and browse them with the following
urls:

Test.cfm
Test.cfm?tester.test=1

You will see that the exact same phenomenon occurs; when the struct already
exists, CF cannot implicitly create it and creates a variable with the name
provided.

HTH, 

Rich Kroll


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Re: Scary fun with variables scopes.

[Claude Schneegans]

 >>But I guess that's the point. Its not a structure in this case. Dump 
#URL# and the value is not shown as a structure. Its a simple value ie 
"test.test".

That's not only the point, it is also an issue, since in theory, 
variable cannot have dots in their names.
So CF is actually creating an illegal variable... what a shame!


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Re: Scary fun with variables scopes.

[Janet MacKay]

>But this is unconsistent with the way CF really works:
>Try 
>
>
>CFDUMP shows that test is a structure with a variable " test", not a 
>variable "test.test"

But I guess that's the point. Its not a structure in this case. Dump #URL# and 
the value is not shown as a structure. Its a simple value ie "test.test".



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Re: Scary fun with variables scopes.

[Claude Schneegans]

 >>I don't think its a structure.  Just a variable name with a "." in it.

But this is unconsistent with the way CF really works:
Try 


CFDUMP shows that test is a structure with a variable " test", not a 
variable "test.test"

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Re: Scary fun with variables scopes.

[Janet MacKay]

>I tried it, and dumped session: test is not there, you must have created
>another struct named "session", I tried dumping variables it is not there?

Its not a structure, but you'll see it if you dump the url scope. 

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Re: Scary fun with variables scopes.

[Janet MacKay]

>seems it creates a struct called session in the url scope: var="#url#" />

I don't think its a structure.  Just a variable name with a "." in it. 

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Re: Scary fun with variables scopes.

[Ron Gowen]

seems it creates a struct called session in the url scope: 

On 10/5/07, Ron Gowen <[EMAIL PROTECTED]> wrote:
>
> I tried it, and dumped session: test is not there, you must have created
> another struct named "session", I tried dumping variables it is not there?
>
>
>
> On 10/5/07, Ian Skinner <[EMAIL PROTECTED]> wrote:
> >
> > Give this a try if you have a moment.
> >
> > Put this code in a file test.cfm.  Note: no  tag.
> >
> > Session.test: #session.test#
> > 
> >Session Variable evaluated true.
> > 
> >
> > Then call the page with this url:  
> > http://aDomain/test.cfm?session.test=true
> >
> > Is this discussed or documented somewhere?
> >
> >
> >
> >
> > 

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Re: Scary fun with variables scopes.

[Janet MacKay]

>I don't think its a structure.  Just a variable name with a "." in it.

Nm. I see Charlie Griefer already explained that :) 

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Re: Scary fun with variables scopes.

[Ron Gowen]

I tried it, and dumped session: test is not there, you must have created
another struct named "session", I tried dumping variables it is not there?



On 10/5/07, Ian Skinner <[EMAIL PROTECTED]> wrote:
>
> Give this a try if you have a moment.
>
> Put this code in a file test.cfm.  Note: no  tag.
>
> Session.test: #session.test#
> 
>Session Variable evaluated true.
> 
>
> Then call the page with this url:
> http://aDomain/test.cfm?session.test=true
>
> Is this discussed or documented somewhere?
>
>
>
>
> 

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Re: Scary fun with variables scopes.

[Janet MacKay]

Does this work for anyone if the variable name is something other than session? 

Test


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Re: Scary fun with variables scopes.

[Charlie Griefer]

add this:

#isSimpleValue(session.test)# <-- YES
 <-- error

which is weird because as of CFMX, creating a variable with a dot in
the name will implicitly create a struct (soo  would create a struct named 'foo' with a key named 'bar' and equal
to 123).

I guess the fact that 'session' is a reserved word prohibits CF from
creating it as a struct so you get a simple value of "session.test"
equal to 'true'.

so basically the bottom line is... you're not manipulating the
"session" (which doesn't even exist).

On 10/5/07, Ian Skinner <[EMAIL PROTECTED]> wrote:
> Give this a try if you have a moment.
>
> Put this code in a file test.cfm.  Note: no  tag.
>
> Session.test: #session.test#
> 
> Session Variable evaluated true.
> 
>
> Then call the page with this url:  http://aDomain/test.cfm?session.test=true
>
> Is this discussed or documented somewhere?
>
>
>
>
> 

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RE: Scary fun with variables scopes.

[Rich]

Ian,
ColdFusion is evaluating the line  and is looking
through all known scopes and is finding URL['session.text'], treating it as
a variable name, which is evaluating to true.  Ben Nadel discussed this type
of non-assertive scope reference in a recent blog post
(http://www.bennadel.com/blog/957-Code-Assertively.htm).

HTH,
Rich Kroll 


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Scary fun with variables scopes.

[Ian Skinner]

Give this a try if you have a moment.

Put this code in a file test.cfm.  Note: no  tag.

Session.test: #session.test#

Session Variable evaluated true.


Then call the page with this url:  http://aDomain/test.cfm?session.test=true

Is this discussed or documented somewhere?




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