Re: automatically call functions based on arguments

normanj <nii2awh@xxxxxxxxx> writes:


Now, the presence of these digits is strange.  Couldn't they be
parameters to the functions?  Do you have a lot of them?

Sorry, those digits should be replaced with normal strings.
All those parameters have nothing to do with the parameters
of functions/macros, they are only related with their names.
Yes, maybe hundreds.



(defvar *name-to-function-map*
  '((aa func-aa)
    (bb func-bb)
    (cc func-cc)))

(defun call-function (name arguments)
   (let ((fun  (cdr (assoc name *name-to-function-map*))))
      (if fun
        (apply fun arguments)
        (error "No user function named ~S" name))))

(call-function 'aa 1 2)
(call-function (read) (read) (read))


This could be taken as a solution.

Given the number of functions, it might be worthwhile to use a
hash-table for the map.

(defvar *name-to-function-map*
(make-hash-table :test (function equal))) ; case sensitive strings, or else equalp
(dolist (pair '( (func-aa-1-2 . (aa one two)) ; which is the same to write (func-aa aa one two)
(func-bb-3-2 . (bb three two))
... ))
(setf (gethash (cdr pair) *name-to-function-map*) (car pair)))

and then use (gethash name *name-to-function-map*) instead of (cdr (assoc ...)),
with name bound to (aa one two), etc.

--
__Pascal Bourguignon__
.

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