sas - %str 和 %bquote 之间的宏 sas 差异

Question

示例代码:-

%Let a = begin;

%let b1 = %str(&a);

%let b2 = %nrstr(&a);

%let b3 = %bquote(&a);

%let b4 = %nrbquote(&a);

%let b = end;

实际输出:-

b1 = begin 
b2 = &a 
b3 = begin 
b4 = begin

预期输出:-

b3 = end     
b4 = &a

这是因为 bquote 和 nrquote 是执行时间，而 str 和 nrstr 是编译时间吗？

Answer 1

如 SAS 手册 http://support.sas.com/documentation/cdl/en/mcrolref/61885/HTML/default/viewer.htm#z3514quote.htm 中所述,

%QUOTE and %NRQUOTE mask the same items as %STR and %NRSTR, respectively. However, %STR and %NRSTR mask constant text instead of a resolved value. And, %STR and %NRSTR work when a macro compiles, while %QUOTE and %NRQUOTE work when a macro executes.