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Re: Questions regarding RFC 5228

2008-10-20 17:55:07

(OOPS, used wrong identity)

Arnt Gulbrandsen wrote:

Stephan Bosch writes:

I am finishing up a first release of my Sieve implementation, and one of the TODO items that yet remains is getting some answers to questions that arose during development. I've collected these into a file an now I submit them to this list to get some clarification. Any help is greatly appreciated.

Sieve is a simple language... All commands in a script can be arranged into basic blocks, and the basic blocks form a DAG. (I don't remember whether this remains true with Ned's MIME/looping extension.)

I wonder whether it is possible to walk along the DAG and say "this assignment is invalid since it leads to an error when the variable is used".
In extreme cases, a user can extract data from the incoming message
using :matches or even :regex. Then, there is really no way of telling
what the variable is going to contain. But yes, in all other cases one
could do compile-time string constant evaluation and be done with it.

I am interested particularly in those extreme cases. Not that I see a
particular use for those in the mentioned cases, but I like to be thorough.



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