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overflow.sas
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overflow.sas
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/******************************************************************************************************************
Program Name : Overflow.sas
Purpose : Separates strings into 200 length without cutting words per CDISC guidance
Programmer : LGomez
Date : 02NOV2020
Comments :
Program expands variables with length of more than 200 into muliple variables of 200.
Follows SDTMIG standad for variable namening (section 4.1.2.9, pg 38, version 3.2).
Parameters:
dset - Input dataset.
Info and rules:
- dset: Default to WORK directory if no library specified.
- reanames original variable with a sufix of X.
-The first variable will receive the original name, while the rest of the variables
will have a suffix of 1-N.
EX: COVALX, COVAL, COVAL1, COVAL2, ... ,COVALn
- Generates warning if input dataset does not exist or if no variables with more than 200 found.
Output:
- Same as input dataset with a underscore as suffix.
WILL BREAK IF:
- Any finction is added as input (i.e rename, where, keep, etc);
EX: %overflow(db.ae(rename = (Subject_id = SUBJID)));
Future Plans:
traverse through directory
******************************************************************************************************************/
%macro overflow(dset);
*************************************************************************************
Prevents input from breaking macro and gives warning if dataset does not exist
Formats data as follows:
Input = DB.ae -> db.ae
*************************************************************************************;
%if %index("&dset", .) > 0 %then %do;
%let lib = %lowcase(%scan(&dset, 1));
%let data = %lowcase(%scan(&dset, 2));
%end;
%else %do;
%let lib = work;
%let data = %lowcase(%scan(&dset, 1));
%end;
%if %sysfunc(exist(&lib..&data.)) = 0 %then %put WARNING (AC): DATASET &dset DOES NOT EXIST;
%else %do;
data tempmacroset;
set &dset;
run;
/*data tempmacroset;*/
/* set db.acm_labs;*/
/*run; */
*************************************************************************************
Resizes variable lengnths of > 200 but Content <200 into a dataset
call "fixlen"
ex: COVAL = "Hello" (length = 600) -> COVAL = "Hello" (length = 5)
*************************************************************************************;
option spool;
proc sql;
create table tempmacrovar as
select name
from dictionary.columns
where upcase(libname) ="WORK" & upcase(memname) ="TEMPMACROSET" & LENGTH > 200;
quit;
*** check if tempmacrovar is empty dataset ***;
data _null_;
call symputx('obscnt',0);
set tempmacrovar;
call symputx('obscnt',_n_);
stop;
run;
%if &obscnt. ne 0 %then %do;
data _null_;
call execute('proc sql noprint; select ');
do until(done);
set tempmacrovar end=done;
call execute('max(length(' !! strip(name) !! '))');
if not done then call execute(',');
end;
call execute(' into ');
do until (done1);
set tempmacrovar end=done1;
call execute(':' !! strip(name));
if not done1 then call execute(',');
end;
call execute("from tempmacroset; quit;");
stop;
run;
data _null_;
call execute("data fixlen; set tempmacroset (rename=(");
do until (done);
set tempmacrovar end=done;
call execute(strip(name) !! '=_' !! strip(name) !! ' ');
end;
call execute(')); length ');
do until (done2);
set tempmacrovar end=done2;
call execute(strip(name) !! ' $&' !! strip(name) !! '. ');
end;
call execute(';');
do until (done3);
set tempmacrovar end=done3;
call execute(strip(name) !! '=_' !! strip(name) !! ';');
end;
call execute('drop ');
do until (done4);
set tempmacrovar end=done4;
call execute('_' !! strip(name) !! ' ');
end;
call execute('; run;');
stop;
run;
%end;
option nospool;
*************************************************************************************
Varname1-n: list the variable names
len1-n : Number of variables needed to expand (i.e length=600 len=3)
totlen1-n : Total length of variable
vlistn : Number of variables with > 200
*************************************************************************************;
proc sql noprint;
select NAME, floor(length/200), length
into :varname0 - :varname99,
:len0 - :len99,
:totlen0 - :totlen99
from dictionary.columns
where upcase(libname) ="WORK" & upcase(memname) ="FIXLEN" & LENGTH > 200;
%let vlistn = %eval(&sqlobs - 1);
%let obsn = &sqlobs;
quit;
/*%put &vlistn;*/
/*%put &varname0;*/
/*%put &varname1;*/
/*%put &totlen0;*/
/*%put &totlen1;*/
/*%put &len0;/
/*%put &len1;*/
*************************************************************************************
Expands variable into multiptle 200 char variables, followed
by a Nth Suffic.
EX: if variable "COVAL" has length of 580 then data will be
presented as follows:
|-----------------------------------------------------------------------------|
| COVAL1 (From 1 - 200) | COVAL2 (From 200 - 400) | COVAL3 (From 400 - 600) |
|-----------------------------------------------------------------------------|
*************************************************************************************;
%macro dothis;
data _&data (drop = m_x m_left m_leftN m_right m_rightN m_head m_leng);
set tempmacroset;
%do i = 0 %to &vlistn.;
rename &&varname&i.. = &&varname&i..X &&varname&i..0 = &&varname&i..;
m_leng = ifn(missing(&&varname&i..), ., length(&&varname&i..));
m_x = 1;
m_left = 1;
m_right = 200;
m_head = 200;
array newvars&i. $200 &&varname&i..0 - &&varname&i.&&len&i.;
do over newvars&i.;
*** Determine left and right nodes ***;
if m_head >= m_leng then do; *** if Node is at the end of string ***;
if m_left < m_leng then m_leftN = findc(substr(strip(&&varname&i.), m_left), ' ', "bi");*** Find first space from m_left ***;
m_rightN = m_leng;
end;
else do;
m_leftN = findc(substr(&&varname&i., m_left, 201), ' ', "bi");
m_rightN = m_head + findc(substr(&&varname&i., m_head+1), ' ', "i");
end;
if m_x = 1 & ~missing(&&varname&i.) then do;
if m_leftN = 0 then do; *** in case the first word is bigger than 200 ***;
newvars&i.[m_x] = substr(&&varname&i., m_left, 200);
m_left = m_leftN + 201;
end;
else if m_leng <= 200 then do; *** in case the length variable is less than 200 ***;
newvars0[m_x] = substr(&&varname&i., m_left);
m_left = 200;
end;
else do;
newvars&i.[m_x] = substr(&&varname&i., m_left, m_leftN);
m_left = m_left + m_leftN;
end;
m_right = m_left + 200;
m_head = m_right;
end;
else if m_rightN = m_leng and ~missing(&&varname&i.) then do;
newvars&i.[m_x] = substr(&&varname&i., m_left);
m_rightN = m_rightN + 1;
m_leftN = m_head;
m_left = m_head;
end;
else if m_leftN < m_head and ~missing(&&varname&i.) then do;
if m_leftN = 0 then newvars&i.[m_x] = substr(&&varname&i., m_left, 200);
else newvars&i.[m_x] = substr(&&varname&i., m_left, m_leftN);
m_left = m_left + m_leftN;
m_right = m_left + 200;
m_head = m_right;
end;
m_x + 1;
end;
%end;
run;
%mend dothis;
*** check for empty/no variables over 200 ***;
%if &obsn. eq 0 %then %do;
%put /------------------------------------------------------------------------------------\;
%put ;
%put ;
%put WARNING: DATASET &data HAS NO VARIABLES WITH OVER 200 CHARACTERS;
%put ;
%put ;
%put \------------------------------------------------------------------------------------/;
%end;
%else %do;
%dothis;
%end;
/**** removes temporary datasets ***;*/
/*proc datasets nolist lib=work;*/
/* delete tempmacroset tempmacrovar;*/
/*quit;*/
%end;
%mend overflow;
%overflow(db.acm_labs);