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comp.lang.ruby

Reset the whole state

Remi Gillig

6/13/2008 2:57:00 PM

Hello,

I just seached about this problem and found two 2 years old threads :
http://groups.google.com/group/comp.lang.ruby/browse_thread/thread/875a09...
http://groups.google.com/group/comp.lang.ruby/browse_thread/thread/3e6fa1...

Each of these talk about how to reset the whole Ruby state, like
starting from a clean interpreter but without rerunning it. More or
less like emptying everything and putting back the predefined
constants, modules and classes.

The first thread has a solution which is using remove_const to not be
able to create classes anymore but this actually does not work
properly because you can still do this :
# class Hello end
# $hello = Hello
# Object.instance_eval("remove_const :Hello")
# h = $hello.new

I'm quite surprised that there was nothing about this in over 2 years
of development. Maybe there are some explanation inside the Ruby
Hacking Guide but most of it is in Japanese.

Anybody has any idea on how to implement this? Thanks.

Remi Gillig.
2 Answers

Robert Klemme

6/13/2008 4:10:00 PM

0

On 13.06.2008 16:57, Remi Gillig wrote:
> Hello,
>
> I just seached about this problem and found two 2 years old threads :
> http://groups.google.com/group/comp.lang.ruby/browse_thread/thread/875a09...
> http://groups.google.com/group/comp.lang.ruby/browse_thread/thread/3e6fa1...
>
> Each of these talk about how to reset the whole Ruby state, like
> starting from a clean interpreter but without rerunning it. More or
> less like emptying everything and putting back the predefined
> constants, modules and classes.
>
> The first thread has a solution which is using remove_const to not be
> able to create classes anymore but this actually does not work
> properly because you can still do this :
> # class Hello end
> # $hello = Hello
> # Object.instance_eval("remove_const :Hello")
> # h = $hello.new
>
> I'm quite surprised that there was nothing about this in over 2 years
> of development. Maybe there are some explanation inside the Ruby
> Hacking Guide but most of it is in Japanese.
>
> Anybody has any idea on how to implement this? Thanks.

I am wondering what you need that for. I guess removal is pretty
complex and thus time consuming because even a freshly started Ruby
interpreter does contain some classes and method definitions. And
creating a process isn't that expensive.

Having said that, maybe you can look at how Ruby can be embedded in C
programs. Then you could create a new initial context if something like
that exists.

Cheers

robert

Remi Gillig

6/14/2008 10:48:00 AM

0

On Jun 13, 6:09 pm, Robert Klemme <shortcut...@googlemail.com> wrote:
> On 13.06.2008 16:57, Remi Gillig wrote:
>
>
>
> > Hello,
>
> > I just seached about this problem and found two 2 years old threads :
> >http://groups.google.com/group/comp.lang.ruby/browse_thread......
> >http://groups.google.com/group/comp.lang.ruby/browse_thread......
>
> > Each of these talk about how to reset the whole Ruby state, like
> > starting from a clean interpreter but without rerunning it. More or
> > less like emptying everything and putting back the predefined
> > constants, modules and classes.
>
> > The first thread has a solution which is using remove_const to not be
> > able to create classes anymore but this actually does not work
> > properly because you can still do this :
> > # class Hello end
> > # $hello = Hello
> > # Object.instance_eval("remove_const :Hello")
> > # h = $hello.new
>
> > I'm quite surprised that there was nothing about this in over 2 years
> > of development. Maybe there are some explanation inside the Ruby
> > Hacking Guide but most of it is in Japanese.
>
> > Anybody has any idea on how to implement this? Thanks.
>
> I am wondering what you need that for. I guess removal is pretty
> complex and thus time consuming because even a freshly started Ruby
> interpreter does contain some classes and method definitions. And
> creating a process isn't that expensive.
>
> Having said that, maybe you can look at how Ruby can be embedded in C
> programs. Then you could create a new initial context if something like
> that exists.
>
> Cheers
>
> robert

It's actually embedding that I'm using right now. I am using Ruby as a
script language for a code editor to perform operations on text etc.
There is a script which is loaded when the program loads which
contains
some classes defined by the user for example. I would like to be able
to
reload this script without having warnings about constants, having
classes mixed together if the user changed the name of a function
between the loadings or still having the same global variables.

Remi Gillig.