On Mar 28, 4:05 pm, billh04 <h...@tulane.edu> wrote:
> I am using keywords as constants in my clojure programs, but I am
> worried about misspelling them. For example, I am writing a game and I
> am using the keywords :north and :south to indicate objects that
> belong to the north player or the south player. With this, I can
> define how to create the pieces for the players:
>
> (defn createPiece [id player] {:tag ::piece, :id id, :player
> player})
>
> where player can take the values :north or :south. I have many other
> such constants in the program.
>
> I have been thinking of doing the following to catch misspellings:
>
> (def -north- :north)
> (def -south- :south)
>
> and then using these two definitions as follows:
>
> (def northPiece1 (createPiece 1 -north-))
>
> rather than doing this:
>
> (def northPiece1 (createPiece 1 :north))
>
> But, before I make these changes, I wondered if anyone else has run
> into this problem, and if it is worth it to consider an option to be
> able to declare the known constant keywords that will be used in the
> program and then treat the undeclared keywords as warnings?
>
> Another option would to be able to get a cross-reference of all
> keywords in the clj files within a folder (and subfolders) that shows
> where they are declared and used (like was done for Cobol programs in
> the 1970's).
Another option you might consider is defining functions that sanity-
check your keys and values, so you can say, for example
(defn createPiece [id player]
(with-allowed-keys
[:player :tag :id]
(with-allowed-values
{:player [:north :south]}
{:tag ::piece,
:id id,
:player player})))
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