Date: Sat, 28 Jan 2012 11:30:10 -0500
Reply-To: bbser 2009 <bbser2009@GMAIL.COM>
Sender: "SAS(r) Discussion" <SAS-L@LISTSERV.UGA.EDU>
From: bbser 2009 <bbser2009@GMAIL.COM>
Subject: Re: Two short marcos, one works, one not
In-Reply-To: <CACsQYve8yR33mYdkLUav=CTZ8yJSpbMkoY3H5_umRoW6Vz=EKQ@mail.gmail.com>
Content-Type: text/plain; charset="us-ascii"
Quentin (and all):
Thank you for your comments.
I made those examples for the purpose of understanding the code I mentioned
in another thread on SAS-L.
Anyway, here is another code in that regard, which only use %bquote and it
works fine!
*This code works!;
%macro zzzz;
%if %bquote(')=%bquote(')
%then %put ok;
%else %put not ok;
%mend zzzz;
%zzzz
This seems even weirder when comparing this code with the following
non-working code I mentioned previously:
*This code does NOT work!;
%macro xxxx;
%if %bquote(%str(%'))=%bquote(')
%then %put ok;
%else %put not ok;
%mend xxxx;
%xxxx
I hope I am not torturing you and others who are thinking about this thread.
;)
Regards, Max
(Maaxx)
-----Original Message-----
From: qmcmullen@gmail.com [mailto:qmcmullen@gmail.com] On Behalf Of Quentin
McMullen
Sent: January-28-12 10:12 AM
To: SAS-L@LISTSERV.UGA.EDU; bbser 2009
Subject: Re: [SAS-L] Two short marcos, one works, one not
Hi Max,
Well I was disappointed to see this example. I don't have an answer,
but I do have some comments.
I simplified your code a bit, with the same disappointing finding as
inspired your question:
%macro xxxx;
%if %bquote(')=%str(%')
%then %put ok;
%else %put not ok;
%mend xxxx;
%xxxx
%macro yyyy;
%if %str(%')=%bquote(')
%then %put ok;
%else %put not ok;
%mend yyyy;
%yyyy
To me, the question is why does the first example work? That is,
since %bquote is an execution time quoting function, I expect both
versions of the macro to choke during macro compilation due to
unmatched quotes.
I turned on mlogic, and it showed I think some things of interest:
Note that below there are no boxes indicating that the quote marks are
masked.
152 %macro xxxx;
153 %if %bquote(')=%str(%')
154 %then %put ok;
155 %else %put not ok;
156 %mend xxxx;
157 %xxxx
MLOGIC(XXXX): Beginning execution.
MLOGIC(XXXX): %IF condition %bquote(')=%str(%') is TRUE
MLOGIC(XXXX): %PUT ok
ok
MLOGIC(XXXX): Ending execution.
If you remove %bquote from the left side, mprint shows you that %str()
has masked its quote, as expected:
158 %macro nobquote;
159 %if house=%str(%')
160 %then %put ok;
161 %else %put not ok;
162 %mend;
163 %nobquote
MLOGIC(NOBQUOTE): Beginning execution.
MLOGIC(NOBQUOTE): %IF condition house= is FALSE
MLOGIC(NOBQUOTE): %PUT not ok
not ok
MLOGIC(NOBQUOTE): Ending execution.
Simply adding an (unneeded) %bquote to the left side does not change this.
164 %macro bquotenoquote;
165 %if %bquote(house)=%str(%')
166 %then %put ok;
167 %else %put not ok;
168 %mend;
169 %bquotenoquote
MLOGIC(BQUOTENOQUOTE): Beginning execution.
MLOGIC(BQUOTENOQUOTE): %IF condition %bquote(house)= is FALSE
MLOGIC(BQUOTENOQUOTE): %PUT not ok
not ok
MLOGIC(BQUOTENOQUOTE): Ending execution.
But if you add an unmatched quote inside the %bquote, then (according
to mlogic at least), %str() is no longer hiding its unmatched quote,
which seems odd indeed.
178 %macro bquotewithquote;
179 %if %bquote(ho'use)=%str(%')
180 %then %put ok;
181 %else %put not ok;
182 %mend;
183 %bquotewithquote
MLOGIC(BQUOTEWITHQUOTE): Beginning execution.
MLOGIC(BQUOTEWITHQUOTE): %IF condition %bquote(ho'use)=%str(%') is FALSE
MLOGIC(BQUOTEWITHQUOTE): %PUT not ok
not ok
MLOGIC(BQUOTEWITHQUOTE): Ending execution.
And if you have %bquote() on the left with an unmatched quote, and no
unmatched quote on the right, then the macro will not compile, due to
the unmantched quote (as expected).
%macro bqouteNOstr;
%if %bquote(ho'use)=house
%then %put ok;
%else %put not ok;
%mend;
Other than those observations, I'm still at a loss to explain why
%bquote is behaving this way. It doesn't match wth my
expectations/understanding. Look forward to hearing from others.
Kind Regards,
--Quentin
On Sat, Jan 28, 2012 at 12:20 AM, bbser 2009 <bbser2009@gmail.com> wrote:
> Greetings all!
>
> I have two short macros as shown below.
> The second code is obtained by merely swapping the left-hand and
right-hand
> sides of the logical equality in the first code.
> But the first works fine, the second does not work.
> Could you please explain the reason? Thank you very much in advance!
>
> Best regards, Max
> (Maaxx)
>
> *This code works.;
> %macro xxxx;
> %if %bquote(')=%bquote(%str(%'))
> %then %put ok;
> %else %put not ok;
> %mend xxxx;
>
> %xxxx
>
>
> *This code does NOT work!;
> %macro xxxx;
> %if %bquote(%str(%'))=%bquote(')
> %then %put ok;
> %else %put not ok;
> %mend xxxx;
>
> %xxxx
