Re: ylwrap proposition

[Ralf Wildenhues]

* Sergey Poznyakoff wrote on Sat, Jun 23, 2007 at 02:04:29PM CEST:
> Ralf Wildenhues <address@hidden> ha escrit:
> 
> > Can s/yy/.../ change anything unintended?  E.g., do we need to ensure it
> > only changes words beginning with yy?
> 
> In theory it could, for example if the programmer used identifiers
> beginning with, or containing `yy'. However, I can hardly imagine
> someone who does that. At least, all yacc manuals declare that `yy'
> prefix is reserved for yacc/lex identifiers and explicitly discourage
> its use in application identifiers.
> 
> It would be preferable, of course, to change only those `yy' that occur
> at the beginning of words. But I cannot figure out a portable way of
> doing so in sed.

Something like 
  s/^yy/REPL/
  s/\([^a-zA-Z0-9]\)yy/\1REPL/

but then sed should be executed as 'LC_ALL=C sed' to avoid locale
issues.  Another possibility is to just list all letters, as is done
elsewhere in the script (and could be factored in shell variables, like
Autoconf does.

Cheers,
Ralf