Re: st: one-variable varlist with options includes extraneous comma

[Michael Manti <mmanti@mac.com>]

Jeph,

You are correct. I did not read the User's Guide carefully enough.

My problem is handled by --tokenize `varlist'--, which puts each  
variable in the varlist into the numbered macros.

Thanks for the tip,

Michael Manti
mmanti@mac.com


On Jul 25, 2006, at 9:21 AM, Jeph Herrin wrote:


> IIRC `1' is the macro representing the first token in the string  
> following
> the program invocation. In your case, the first token is "foo,".  
> Similarly,
> `2' should contain the second token, in your case "option(1". Or am  
> I mixing
> up my Stata versions?
>
>
>
> Michael Manti wrote:
>
> > Stata gurus,
> > If I define a program that can take a one-variable varlist and an  
> > optional option, it includes an extraneous comma in `1' if the  
> > program is invoked with the option. The extraneous comma does not  
> > appear in `varlist'.
> > The extraneous comma does not appear if the program is invoked  
> > without the option. Example (Stata/SE 9.2, Windows):
> > . program test1
> >   1.         syntax varlist(min=1) [, option(numlist)]
> >   2.         display "`varlist'"
> >   3.         display "`1'"
> >   4.         local varlist : subinstr local varlist "," "", all
> >   5.         display "Remove extraneous comma from varlist"
> >   6.         display "`varlist'"
> >   7.         display "`1'"
> >   8.         local 1 : subinstr local 1 "," "", all
> >   9.         display "Remove extraneous comma from 1"
> > 10.         display "`1'"
> > 11. end
> > .
> > . display "Sometimes first argument in one-argument varlist  
> > includes extraneous comma"
> > Sometimes first argument in one-argument varlist includes  
> > extraneous comma
> > .
> > . test1 foo, option(1 1 1)
> > foo
> > foo,
> > Remove extraneous comma from varlist
> > foo
> > foo,
> > Remove extraneous comma from 1
> > foo
> > .
> > . display "Sometimes it does not"
> > Sometimes it does not
> > .
> > . test1 bar
> > bar
> > bar
> > Remove extraneous comma from varlist
> > bar
> > bar
> > Remove extraneous comma from 1
> > bar
> > .
> > end of do-file
> > .
> > If I define the option as required (rather than optional as  
> > above), --test1 foo, option(1 1 1)-- still produces what I think  
> > of as a bug.
> > Is the bug in --syntax--, or is the bug in my understanding of  
> > syntax?
> > Thanks!
> > Michael Manti
> > mmanti@mac.com
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