This macro allows concatenating a new string to an accumulating macro variable (for example, to list error messages). It intelligently manages the addition of a separator (default '; ') only if the variable already contains a value and the new string is not empty, thus avoiding superfluous separators at the beginning or end.
Data Analysis
Type : CREATION_INTERNE
The script does not manipulate data tables (datasets); it operates solely on in-memory macro variables.
1 Code Block
MACRO
Explanation :
Macro definition. It evaluates the length of the target macro variable (indirectly referenced by &&&mvar) and the string to append (&append). If both contain data, they are concatenated with the separator. Otherwise, only the non-empty part is returned without a separator.
Macro definition. It evaluates the length of the target macro variable (indirectly referenced by &&&mvar) and the string to append (&append). If both contain data, they are concatenated with the separator. Otherwise, only the non-empty part is returned without a separator.
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| 1 | %put MACRO CALLED: appmvar v1.0; |
| 2 | |
| 3 | %macro appmvar(mvar,append,sep=%str(; )); |
| 4 | %IF %LENGTH(&&&mvar) and %LENGTH(&append) %THEN %DO; |
| 5 | &&&mvar&sep&append |
| 6 | %END; |
| 7 | %ELSE %IF %LENGTH(&append) %THEN %DO; |
| 8 | &append |
| 9 | %END; |
| 10 | %ELSE %DO; |
| 11 | &&&mvar |
| 12 | %END; |
| 13 | %mend appmvar; |
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Copyright Info : Author: Roland Rashleigh-Berry / Public domain software
