custom reader and custom rpcs

[Alexander Popolitov]

Hi everyone!

So, here is my proposed enhancement to swank (see patch-file in the 
attachment).
The idea is, that executing arbitrary code on the lisp core, which swank 
allows by default, is not always
desirable.
Hence, patch does following things:
1) Add SWANK::*READER* variable, which, when bound to a function when 
calling SETUP-SERVER, causes
     this function to be used when reading forms in SWANK-RPC::READ-FORM
2) SWANK::DISPATCH-EVENT's DESTRUCTURING-CASE is substituted by more 
flexible lookup in the hashtable.
     If SWANK::*VALID-RPC* list is bound to new value when calling 
SETUP-SERVER, then in this particular
     server only those new RPC's will be active.

1st change is useful, I think, not only for securing the reader in a way 
that I did in my CL-SECURE-READ system,
but also if you actually want learn SWANK talk some non-s-exp-based 
protocol.

So, what do you think?

Yours sincerely,
Alex
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