List Processing Basics: Creating and Using Lists of Macro ... - NESUG

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NESUG 2007Hands-On WorkshopsWRITE CALLS TO A MACRO VARIABLEIn the previous example the macro variableList was used to hold only the listof distinct regions. Since we want to useeach region in a macro call we could constructthe list to contain the macro callsthemselves.In this example the concatenation functioncat is used to build the macro call.Note the function cat does not trim trailingspaces; thus we use trim(Item) inline 11. Compare the function cat, usedhere, to the function cats in later examples.See Ex07 and Ex08, pg. 17.write-calls-into-mvar.sas1 %Include Project(ReportTest);2 %Macro Demo(InData =3 ,InVar =4 ,MacroName =5 ,Testing = 0);67 PROC SQL %If not &Testing. %then noprint;8 ; select distinct &InVar. as Item,9 cat( ’%’10 , "&MacroName.(&InVar.="11 , trim(Item), ’)’12 ) as CallMacro13 into :Item,14 :List separated by ’ ’15 from &InData.;16 quit;17 run;18 %If not &Testing. %then19 &List.; %*execute statements in mvar List;20 run; %Mend Demo;When testing,. . . the calls of themacro are writtento the list:When not testing. . . the calls are executed:write-calls-into-mvar.log43 25 %Demo(InData = sashelp.Shoes44 26 ,InVar = Region45 27 ,MacroName = ReportTest46 28 ,Testing = 1);47 MPRINT(DEMO): PROC SQL ;48 MPRINT(DEMO): select distinct Region as Item, cat( ’%’ ,49 "ReportTest(Region=" , trim(Item), ’)’ ) as CallMacro into :Item, :List50 separated by ’ ’ from sashelp.Shoes;51 MPRINT(DEMO): quit;52 NOTE: The PROCEDURE SQL printed page 1.write-calls-into-mvar.lst6 Item CallMacro7 ------------------------------------------------------------------------8 Africa %ReportTest(Region=Africa)9 Asia %ReportTest(Region=Asia)10 Canada %ReportTest(Region=Canada)write-calls-into-mvar.log62 29 %Demo(InData = sashelp.Shoes63 30 ,InVar = Region64 31 ,MacroName = ReportTest65 32 ,Testing = 0);66 MPRINT(DEMO): PROC SQL noprint ;67 MPRINT(DEMO): select distinct Region as Item, cat( ’%’ ,68 "ReportTest(Region=" , trim(Item), ’)’ ) as CallMacro into :Item, :List69 separated by ’ ’ from sashelp.Shoes;70 MPRINT(DEMO): quit;write-calls-into-mvar.log78 MPRINT(DEMO): run;79 REPORTTEST REGION Africa80 MPRINT(REPORTTEST): run;81 REPORTTEST REGION Asia82 MPRINT(REPORTTEST): run;8
NESUG 2007Hands-On WorkshopsWRITE TO FILE THEN INCLUDEWrite to file, then Include, was the firstmethod available to programmers to replicatestatements. It is reviewed here inorder for you to recognize the algorithmand note that it may be replaced with anyof the above macro variable processingmethods.The authors share the opinion that thistechnique is used primary by those programmerswho do not fully understand theapproaches described in the preceedingexamples.Note: compare the Stmnt assignment usingfunction cats in line 16 with cat inwrite-calls-call-execute.See Ex09, pg. 18.write-calls-to-file-include.sas1 %Include Project(ReportTest);2 %Include Project(make-unique-sort);3 %Macro Demo(InData =4 ,InVar =5 ,MacroName =6 ,Testing = 0);78 filename TempFile ’zCallMacro.txt’;910 DATA _Null_;11 attrib Stmnt length = $100;12 file TempFile;1314 do until(EndoFile);15 set &InData. end = EndoFile;16 Stmnt = cats(’%’, "&MacroName.(&InVar.="17 , &InVar.18 , ’)’ );19 %If &Testing. %then %do;20 putlog Stmnt=;21 %end;22 put Stmnt;23 end;24 stop; run;2526 %If not &Testing. %then %do;27 %Include TempFile;28 %end;29 filename TempFile clear;30 run; %Mend Demo;When testing, the calls of themacro are written to the log:write-calls-to-file-include.log63 40 %Demo(InData = Regions64 41 ,InVar = Region65 42 ,MacroName = ReportTest66 43 ,Testing = 1);6768 NOTE: The file TEMPFILE is:69 File Name=C:\LaTeX\HOW-list-proc\sas\zCallMacro.txt,70 RECFM=V,LRECL=2567172 Stmnt=%ReportTest(Region=Africa)73 Stmnt=%ReportTest(Region=Asia)74 Stmnt=%ReportTest(Region=Canada). . . and the TempFile: zCallMacro.txt1 %ReportTest(Region=Africa)2 %ReportTest(Region=Asia)3 %ReportTest(Region=Canada)9
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List Processing Basics: Creating and Using Lists of Macro ... - NESUG

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