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

[Jeph Herrin <junk@spandrel.net>]

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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