macros - SAS MACRO 引用问题 : passing string with macro trigger as macro parameter

Question

是否可以传递带有宏触发器的字符串作为宏参数？请参阅下面的示例代码:

options mprint;
%let string5='%abc%def%';
%macro test(string);
data _null_;
    call execute('%test2('||&string.||')');
run;
%mend;

%macro test2(string2);
    data test3;
        a=%str(%')&string2.%str(%');
    run;
%mend;

%test(&string5);

此代码成功运行，但它尝试调用宏 %abc 和 %def，这导致了警告。

如果我尝试将其放入引号中以屏蔽字符串，则会出现语法错误，如下所示:

options mprint;

    %let string5='%abc%def%';
    %macro test(string);

    data _null_;
        call execute('%test2('||%superQ(string)||')');
    run;
    %mend;

    %macro test2(string2);
        data test3;
            a=%str(%')&string2.%str(%');
        run;
    %mend;

    %test(&string5);

ERROR 22-322: Syntax error, expecting one of the following: a name, a quoted string, a numeric constant, a datetime constant, a missing value, arrayname, (, +, -, INPUT, NOT, PUT, ^, _NEW_, ~.  

有没有办法在不发出警告的情况下解决这个问题？提前致谢!

Answer 1

试试这个:

%let string5='%abc%def%';
%macro test(string);
data _null_;
    call execute('%test2('||%nrstr("&string.")||')');
run;
%mend;

%macro test2(string2);
    data test3;
        a=%nrquote(&string2.);
    run;
%mend;

%test(&string5);