Oh, and #case doesn't need to be in order...

#macro NextX(X,Dir)
   #switch(Dir)
      #range(0,1)
         #local result = X+1;
      #break
      #range(3,4)
         #local result = X-1;
      #break
      #case(2)
      #case(5)
         #local result = X;
      #break
   #end
   (result)
#end

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