[Newbies] How to know where a BlockClosure finish

[Marcus Denker]

On 25.08.2006, at 17:14, Mathieu wrote:

> Hi,
>
> I want to execute several block:
>
> block1 value
> block2 value
> block3 value
>
> but if one block return from a retrun statement I want to quit.
>
> [^3] <- want to quit here
> [3 + 4]
>
> So is there a way to know when a block evaluation finish by a return?
>

There is #hasMethodReturn in BlockContext:

[^3] hasMethodReturn --> true
[3] hasMethodReturn --> false.

But this does a static analysis of the code... even if the ^is not  
executed
(e.g.)
[nil ifNotNil: [^3]]  hasMethodReturn --> true

so... it would be harder to analyze that dynamically... e.g. (without  
me  thinking
to much) you could add code (e.g. using ByteSurgeon)
in front of the return inside a block to set a flag... but I have to  
admit that this
woud be quite strange stuff...

> I need this to interprete a file containing smalltalk and I want to
> control the execution beceause I need to add some condition befor
> evaluate a block.

Why do you need that? I am sure we can find a simple solution if we  
understand
the problem better.

    Marcus

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