topic Re: Using SAS macrovars in LUA in SAS Procedures

Using SAS macrovars in LUA

bl_jyskebank_dk — Tue, 06 Aug 2024 10:43:01 GMT

I know You can use sas.symget to get a macrovar from SAS in Your LUA code.

But I find et easier to just write LUA var.names when programming rather than using sas.symget in my LUA code so I wrote this litte LUA function that gets all SAS macrovars and transfers them to ordinary LUA vars so that I can use them in my code.

%let myVar = TEST;

proc lua;

submit;

function mv2lua()
print("Creating LUA variables for the following SAS macro variables...")
ds = sas.open("sashelp.vmacro","I")
while (sas.next(ds) ~= nil) do
name = sas.get_value(ds, "name")
value = sas.get_value(ds, "value")
print(name .. " - " .. value .. " -> mv_" .. name)
s = "mv_"..name.."=value" -- code for assigning value to new LUA variable
load(s)() -- execute the code thereby creating the variable
end
rc = sas.close(ds)
end

mv2lua()

print(mv_SYSUSERID)

print(mv_myVar)

endsubmit;

run;

Re: Using SAS macrovars in LUA

Tom — Tue, 06 Aug 2024 13:12:12 GMT

Note that you logic will only work for macro variables with values that are less than 200 characters long.

Re: Using SAS macrovars in LUA

yabwon — Tue, 06 Aug 2024 19:11:56 GMT

But it's easy to fix:

options ls=max;

%let myVar = TEST+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++test;


%put &myVar.;


data test;
  set sashelp.vmacro;
  where scope = "GLOBAL";
run;

proc lua;

submit;

function mv2lua()
   print("Creating LUA variables for the following SAS macro variables...")
   ds = sas.open("sashelp.vmacro","I")
   while (sas.next(ds) ~= nil) do
      name = sas.get_value(ds, "name")
      value = sas.get_value(ds, "value")
      offset = sas.get_value(ds, "offset")
      print(name .. " - " .. value .. " -> mv_" .. name)
      
      
      if offset==0 then s = "mv_"..name.."=value" -- code for assigning value to new LUA variable
                   else s = "mv_"..name.."=mv_"..name.." .. value" 
      end
      -- print("###" .. s)
      load(s)() -- execute the code thereby creating the variable


   end
   rc = sas.close(ds)
end

mv2lua()

print(mv_SYSUSERID)

print(mv_MYVAR)

 

endsubmit;

run;

Re: Using SAS macrovars in LUA

Tom — Tue, 06 Aug 2024 19:40:02 GMT

And the next wrinkle is what if you run it inside a macro call so that there are different SCOPEs present in the VMACRO dataset? What if you run in inside a recursive macro so there are multiple copies of the same macro variable in the same scope?

Re: Using SAS macrovars in LUA

yabwon — Tue, 06 Aug 2024 23:07:02 GMT

just for fun;

you can find which value is at which nesting level, even for recursive case

resetline;

/* "Recursive loop" */

%macro R2(s,e,b);
%if %sysevalf(&s. <= &e.) %then 
%do;
  %local _SYSMEXECDEPTH;
  %let _SYSMEXECDEPTH=%sysfunc(abs(%SYSMEXECDEPTH),z10.) ;;
  %put &_SYSMEXECDEPTH. &=s. &=e. &=b.;
  data _null_&_SYSMEXECDEPTH.;
    SET sashelp.vmacro (where=(scope NE 'AUTOMATIC'));
    depth = &_SYSMEXECDEPTH. ;
    ord+1;
  run;
  data _null_;
  run;
  %R2(%sysevalf(&s.+&b.)   /* change in s */
     ,%sysevalf(&e.*1.001) /* change in e */
     ,&b.) /* keep b unchanged */
%end;
%mend R2;

options mprint;

%put %R2(0,2,0.25);


data all/view=all;
  set _NULL_:;
run;

proc sql;
  create table variablesScope as
  select min(ord) as ord
  ,scope
  ,name
  ,offset
  ,value
  ,x.m-count(distinct depth) as depth
  from all,(select max(depth)+1 as m from all) as x
  group by 2,3,4,5
  order by 1,2,3,4,5
  ;
quit;

Bart