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chore(docs): assertscope

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munja
2022-01-19 10:55:52 +01:00
parent e3991c46e2
commit 75f712a305
2 changed files with 53 additions and 9 deletions
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21
base/mp_assertscope.sas
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@@ -1,18 +1,18 @@
/** /**
@file @file
@brief Used to capture scope leakage of macro variables @brief Used to capture scope leakage of macro variables
@details A common 'difficult to detect' bug in macros is where a nested @details
macro over-writes variables in a higher level macro.
This assertion takes a snapshot of the macro variables before and after A common 'difficult to detect' bug in macros is where a nested macro
a macro invocation. This makes it easy to detect whether any macro over-writes variables in a higher level macro.
variables were modified or changed.
Currently, the macro only checks for global scope variables. In the future This assertion takes a snapshot of the macro variables before and after
it may be extended to work at multiple levels of nesting. a macro invocation. Differences are captured in the `&outds` table. This
makes it easy to detect whether any macro variables were modified or
changed.
If you would like this feature, feel free to contribute / raise an issue / If you would like this feature, feel free to contribute / raise an issue /
engage the SASjs team directly. engage the SASjs team directly.
Example usage: Example usage:
@@ -24,6 +24,9 @@
desc=Checking macro variables against previous snapshot desc=Checking macro variables against previous snapshot
) )
This macro is designed to work alongside `sasjs test` - for more information
about this facility, visit [cli.sasjs.io/test](https://cli.sasjs.io/test).
@param [in] action (SNAPSHOT) The action to take. Valid values: @param [in] action (SNAPSHOT) The action to take. Valid values:
@li SNAPSHOT - take a copy of the current macro variables @li SNAPSHOT - take a copy of the current macro variables
@li COMPARE - compare the current macro variables against previous values @li COMPARE - compare the current macro variables against previous values

41
tests/crossplatform/mp_stackdiffs.test.sas Normal file
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@@ -0,0 +1,41 @@
/**
@file
@brief Testing mp_storediffs macro
<h4> SAS Macros </h4>
@li mp_assert.sas
@li mp_assertcolvals.sas
@li mp_assertdsobs.sas
@li mp_stackdiffs.sas
@li mp_storediffs.sas
**/
/* first, make some data */
data work.orig work.deleted work.changed work.appended;
set sashelp.electric;
if _n_ le 10 then do;
output work.orig work.deleted;
end;
else if _n_ le 20 then do;
output work.orig;
age=99;
output work.changed;
end;
else if _n_ le 30 then do;
year=_n_;
output work.appended;
end;
else stop;
run;
%mp_storediffs(sashelp.electric,work.orig,CUSTOMER YEAR
,delds=work.deleted
,modds=work.changed
,appds=work.appended
,outds=work.final
,mdebug=1
)
/* now, stack it back */