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|
;;;; l-system.lisp
#|
(ql:quickload :l-system)
|#
(in-package #:l-system)
;;; "l-system" goes here. Hacks and glory await!
(defparameter *l-system-clauses* (make-hash-table :test 'eq))
(defun iterconcat (fn list)
"Applies fn on each element of list, and concatenate a copy of the resulting lists."
(iter (for item in list)
(appending (funcall fn item))))
(defun l-system (axiom depth)
(iter (repeat depth)
(with result = axiom)
(setf result
(map-l-system result))
(finally (return result))))
(defun map-l-system (clauses)
(iter (for clause in clauses)
(appending (let ((func (gethash (car clause) *l-system-clauses*)))
(if (functionp func)
(let ((result (apply func
(rest clause))))
(when result
result))
(list clause))))))
(defmacro deflsys (symbol vars &body body)
`(def-l-system-clause ',symbol
(lambda ,vars
,@body)))
(defun def-l-system-clause (symbol lambda)
(setf (gethash symbol *l-system-clauses*)
lambda))
|
