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ifthenelse: if elsif(s?) else(?) endif

use Parse::RecDescent;
use Data::Dumper;
...
if 1 then 2 endif
if 1 then 2 elsif 3 then 4 elsif 5 then 6 endif
if 1 then 2 elsif 3 then 4 else 5 endif

[ "if", [ cond1, result1 ],   # first "if" condition/result expression
+ pair
        [ cond2, result2 ],   # 0 or more "elsif" expression pairs
        ...
        otherwise ]           # else branch expression, or undef if no
+ne