Perl Style: Data-Oriented Programming

Data structures are more important than code.
Rob Pike says: `Data dominates. If you've chosen the right data structures and organized things well, the algorithms will almost always be self-evident. Data structures, not algorithms, are central to programming. (See Brooks p. 102.)'
Capture regularity with data, irregularity with code. (Kernighan)
If you see similar functionality in two places, unify it. That is called a `subroutine'.
Consider making a hash of function pointers to represent a state table or switch statement.