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Re: st: -syntax , option(varlist min=0)-?


From   Stas Kolenikov <skolenik@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: -syntax , option(varlist min=0)-?
Date   Thu, 8 Oct 2009 15:01:19 -0500

I guess the technically correct way is to parse it manually at a low level:

syntax, *

if "`options'" == "myoption" local myvarlist _all
else {
   tokenize `options' , parse("()")
   * local 1 must be myoption
   * local 2 must be (
   local myvarlist `3'
   * local 4 must be )
}

You would want to augment Sergiy's suggestion with treatment of all
other possible causes of a failing -syntax- (incorrect option names,
if/in conditions, whatever). In my implementation, you would want to
make sure that `options' indeed contains the word "myoption", etc.

On Thu, Oct 8, 2009 at 1:13 PM, Jeph Herrin <junk@spandrel.net> wrote:
>
> I would like a program to take an option which contains
> either a varlist or nothing. Something like
>
>  syntax varlist..., myoption(varlist min=0)
>
> which Stata doesn't like. The idea is that -myoption-
> only applies to the listed variables in the primary varlist;
> unless -myoption()- is specified, then it applies to all
> variables in the primary varlist. This sounds confusing
> even to me, so in pseudo code, I would like to have
>
>  myprogram var1-var10, myoption(var1)
>
> apply the option to only -var1-, but
>
>  myprogram var1-var10, myoption
>
> apply the option to var1-var10. Seems like I have done this
> before, but it escapes me now. Any ideas?
>
>
>
> thanks,
> Jeph
> *
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>



-- 
Stas Kolenikov, also found at http://stas.kolenikov.name
Small print: I use this email account for mailing lists only.

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