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rock.lisp
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(in-package :lambda-lifter)
(defun in-range-p (metadata x y)
(with-meta-bind (metadata width height)
(and (>= x 1)
(>= y 1)
(<= x width)
(<= y height))))
(defmacro rock-move-values (world objects path metadata rx ry rx-new ry-new rock-type fall object-under &optional (non-map-update nil))
`(values (lambda (x y)
(cond ((and (= x ,rx)
(= y ,ry))
nil)
((and (= x ,rx-new)
(= y ,ry-new))
,(if fall
`(if (and (eq ,rock-type :horock) ,object-under)
:lambda
,rock-type)
rock-type))
(t (funcall ,world x y))))
(lambda (type)
(cond ((eq type ,rock-type) (cons (complex ,rx-new ,ry-new)
(remove (complex ,rx ,ry) (funcall ,objects ,rock-type))))
((eq type :injury) (if ,non-map-update
nil
(eq ,object-under :robot)))
(t (funcall ,objects type))))
,path
,metadata))
(defun rock-fall (iworld imetadata rx ry)
(lambda (world objects path metadata)
(let* ((rx-under rx)
(ry-under (- ry 1))
(rx-new-under rx-under)
(ry-new-under (- ry-under 1)))
(when (and (in-range-p imetadata rx-under ry-under)
(eq nil (funcall iworld rx-under ry-under)))
(rock-move-values world objects path metadata rx ry rx-under ry-under
(funcall iworld rx ry) t
(when (in-range-p imetadata rx-new-under ry-new-under)
(funcall iworld rx-new-under ry-new-under)))))))
(defun rock-slide-right (iworld imetadata rx ry)
(lambda (world objects path metadata)
(let* ((rx-under rx)
(ry-under (- ry 1))
(rx-right (+ rx 1))
(ry-right ry)
(rx-right-under (+ rx 1))
(ry-right-under (- ry 1))
(rx-new-under rx-right-under)
(ry-new-under (- ry-right-under 1)))
(when (and (in-range-p imetadata rx-right-under ry-right-under)
(member (funcall iworld rx-under ry-under) '(:rock :horock :lambda))
(eq nil (funcall iworld rx-right ry-right))
(eq nil (funcall iworld rx-right-under ry-right-under)))
(rock-move-values world objects path metadata rx ry rx-right-under ry-right-under
(funcall iworld rx ry) t
(when (in-range-p imetadata rx-new-under ry-new-under)
(funcall iworld rx-new-under ry-new-under)))))))
(defun rock-slide-left (iworld imetadata rx ry)
(lambda (world objects path metadata)
(let* ((rx-under rx)
(ry-under (- ry 1))
(rx-right (+ rx 1))
(ry-right ry)
(rx-right-under (+ rx 1))
(ry-right-under (- ry 1))
(rx-left (- rx 1))
(ry-left ry)
(rx-left-under (- rx 1))
(ry-left-under (- ry 1))
(rx-new-under rx-left-under)
(ry-new-under (- ry-left-under 1)))
(when (and (in-range-p imetadata rx-left-under ry-left-under)
(in-range-p imetadata rx-right-under ry-right-under)
(member (funcall iworld rx-under ry-under) '(:rock :horock))
(or (not (eq nil (funcall iworld rx-right ry-right)))
(not (eq nil (funcall iworld rx-right-under ry-right-under))))
(eq nil (funcall iworld rx-left ry-left))
(eq nil (funcall iworld rx-left-under ry-left-under)))
(rock-move-values world objects path metadata rx ry rx-left-under ry-left-under
(funcall iworld rx ry) t
(when (in-range-p imetadata rx-new-under ry-new-under)
(funcall iworld rx-new-under ry-new-under)))))))
(defun rock-push-left (rx ry)
(lambda (world objects path metadata)
(let ((rx-left (- rx 1))
(ry-left ry))
(when (and (in-range-p metadata rx-left ry-left)
(eq nil (funcall world rx-left ry-left)))
(rock-move-values world objects path metadata rx ry rx-left ry-left
(funcall world rx ry) nil nil t)))))
(defun rock-push-right (rx ry)
(lambda (world objects path metadata)
(let ((rx-right (+ rx 1))
(ry-right ry))
(when (and (in-range-p metadata rx-right ry-right)
(eq nil (funcall world rx-right ry-right)))
(rock-move-values world objects path metadata rx ry rx-right ry-right
(funcall world rx ry) nil nil t)))))
(defun rock-can-be-pushed-left (world metadata rx ry)
(let ((rx-left (- rx 1))
(ry-left ry))
(and (in-range-p metadata rx-left ry-left)
(eq nil (funcall world rx-left ry-left)))))
(defun rock-can-be-pushed-right (world metadata rx ry)
(let ((rx-right (+ rx 1))
(ry-right ry))
(and (in-range-p metadata rx-right ry-right)
(eq nil (funcall world rx-right ry-right)))))
(defun make-m-v-or (&rest clauses)
(lambda (world objects path metadata)
(iter (for clause in clauses)
(multiple-value-bind (world objects path metadata)
(funcall clause world objects path metadata)
(when world
(return (values world objects path metadata))))
(finally (return (values world objects path metadata))))))
(defun rock-move (iworld imetadata rx ry)
(make-m-v-or (rock-fall iworld imetadata rx ry)
(rock-slide-right iworld imetadata rx ry)
(rock-slide-left iworld imetadata rx ry)))
(defun rocks-move (world objects path metadata)
(let ((world~ world)
(objects~ objects)
(path~ path)
(metadata~ metadata))
(with-meta-bind (metadata width)
(iter (for rock-coord in (sort (append (funcall objects :rock)
(funcall objects :horock)) #'<
:key (lambda (c) (+ (realpart c) (* (imagpart c) width)))))
(multiple-value-setq (world~ objects~ path~ metadata~)
(funcall (rock-move world metadata (realpart rock-coord) (imagpart rock-coord))
world~ objects~ path~ metadata~))))
(values world~ objects~ path~ metadata~)))