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RE: st: question about gettoken and file


From   "Nick Cox" <n.j.cox@durham.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   RE: st: question about gettoken and file
Date   Wed, 26 Mar 2003 13:36:15 -0000

Edwin Leuven
> 
> but with the hidden stuff in stata perhaps there was a 
> construct like
> 
> program define myado, nosubst
> 
> which then skips the substitution (perhaps a useful feature 
> request?)

This may sound like a good idea, but I don't think 
it will fly at all. There are at least two fundamental 
issues arising: 

1. It would mean that the user of an ado would 
need to know (a) that an ado had this flavour and 
(b) that in consequence such an ado could not be invoked using 
local macros as they would not be substituted. Those 
are big burdens to place on the user, whether 
beginner or experienced. (a) bites the beginner hard 
and (b) bites the experienced hard. Either way, this 
violates the principle that a user should not 
need to worry about the internal details of an 
ado, so long as it does what it claims. 

2. It would mean that to parse command lines 
properly Stata would have to peek inside the
command being called to see how that command wants to 
treat its input. Without exaggeration, this would 
violate the whole way Stata is constructed
in terms of division of responsibilities. 

Nick 
n.j.cox@durham.ac.uk 


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