(Pseudo-code) evilness using experimental regexp features might look like: 
$TABLE='a'; #or whatever the default set is
s/(?:\x1B([abcs])(?{$TABLE=$^N}))?(.)/${$TABLE}{$2}/e

[download]
To simplify your table you could expand the RHS to include an ||$2.

Mmmm symbolic references.

UPDATE: You could of course "legitimize" that and use $TABLES{$TABLE}->{$2}

--
In Bob We Trust, All Others Bring Data.

In reply to Re: Shooting at a Moving Target by belg4mit
in thread Shooting at a Moving Target by Anonymous Monk

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