feat: mf_islibds() macro to test if a library.dataset reference is syntactically valid

base/mf_islibds.sas

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+/**
+  @file
+  @brief Checks whether a string follows correct library.dataset format
+  @details Many macros in the core library accept a library.dataset parameter
+  referred to as 'libds'.  This macro validates the structure of that parameter,
+  eg:
+
+    @li 8 character libref?
+    @li 32 character dataset?
+    @li contains a period?
+
+  It does NOT check whether the dataset exists, or if the library is assigned.
+
+  Usage:
+
+      %put %mf_islibds(work.something)=1;
+      %put %mf_islibds(nolib)=0;
+      %put %mf_islibds(badlibref.ds)=0;
+      %put %mf_islibds(w.t.f)=0;
+
+  @param [in] libds The string to be checked
+
+  @return output Returns 1 if libds is valid, 0 if it is not
+
+  <h4> Related Macros </h4>
+  @li mf_islibds.test.sas
+  @li mp_validatecol.sas
+
+  @version 9.2
+**/
+
+%macro mf_islibds(libds
+)/*/STORE SOURCE*/;
+
+%local regex;
+%let regex=%sysfunc(prxparse(%str(/^[_a-z]\w{0,7}\.[_a-z]\w{0,31}$/i)));
+
+%sysfunc(prxmatch(&regex,&libds))
+
+%mend mf_islibds;

tests/crossplatform/mf_islibds.test.sas

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+/**
+  @file
+  @brief Testing mf_islibds macro
+
+      %put %mf_islibds(work.something)=1;
+      %put %mf_islibds(nolib)=0;
+      %put %mf_islibds(badlibref.ds)=0;
+      %put %mf_islibds(w.t.f)=0;
+
+  <h4> SAS Macros </h4>
+  @li mf_islibds.sas
+  @li mp_assert.sas
+
+**/
+
+%mp_assert(
+  iftrue=(
+    %mf_islibds(work.something)=1
+  ),
+  desc=%str(Checking mf_islibds(work.something)=1),
+  outds=work.test_results
+)
+
+%mp_assert(
+  iftrue=(
+    %mf_islibds(nolib)=0
+  ),
+  desc=%str(Checking mf_islibds(nolib)=0),
+  outds=work.test_results
+)
+
+%mp_assert(
+  iftrue=(
+    %mf_islibds(badlibref.ds)=0
+  ),
+  desc=%str(Checking mf_islibds(badlibref.ds)=0),
+  outds=work.test_results
+)
+
+%mp_assert(
+  iftrue=(
+    %mf_islibds(w.t.f)=0
+  ),
+  desc=%str(Checking mf_islibds(w.t.f)=0),
+  outds=work.test_results
+)