;;; ---------------------------------------------------------------------------
(defmethod make-graph ((classes list) &rest args)
- (let ((name (find-or-create-class 'basic-graph classes)))
+ (let ((name (dynamic-classes:find-or-create-class 'basic-graph classes)))
(apply #'make-instance name args)))
;;; ---------------------------------------------------------------------------
;;; ---------------------------------------------------------------------------
-(defmethod find-edge-between-vertexes ((graph basic-graph) (value-1 t) (value-2 t)
- &key (error-if-not-found? t))
- (let ((v1 (find-vertex graph value-1 error-if-not-found?))
- (v2 (find-vertex graph value-2 error-if-not-found?)))
- (aif (and v1 v2 (find-edge-between-vertexes graph v1 v2))
- it
- (when error-if-not-found?
- (error 'graph-edge-not-found-error :vertex-1 v1 :vertex-2 v2)))))
+(defmethod find-edge-between-vertexes
+ ((graph basic-graph) (value-1 t) (value-2 t)
+ &key (error-if-not-found? t))
+ (let* ((v1 (find-vertex graph value-1 error-if-not-found?))
+ (v2 (find-vertex graph value-2 error-if-not-found?)))
+ (or (and v1 v2 (find-edge-between-vertexes graph v1 v2)))
+ (when error-if-not-found?
+ (error 'graph-edge-not-found-error :vertex-1 v1 :vertex-2 v2))))
;;; ---------------------------------------------------------------------------
(defmethod find-vertex ((graph basic-graph) (value t)
&optional (error-if-not-found? t))
- (aif (find-item (graph-vertexes graph) (funcall (vertex-key graph) value))
- it
- (when error-if-not-found?
- (error 'graph-vertex-not-found-error :vertex value :graph graph))))
+ (or (find-item (graph-vertexes graph) (funcall (vertex-key graph) value))
+ (when error-if-not-found?
+ (error 'graph-vertex-not-found-error :vertex value :graph graph))))
-;;; ---------------------------------------------------------------------------
+(defmethod find-vertex ((graph basic-graph) (vertex basic-vertex)
+ &optional (error-if-not-found? t))
+ (cond ((eq graph (graph vertex))
+ vertex)
+ (t
+ (when error-if-not-found?
+ (error 'graph-vertex-not-found-error
+ :vertex vertex :graph graph)))))
(defmethod find-vertex ((edge basic-edge) (value t)
&optional (error-if-not-found? t))
(defmethod search-for-vertex ((graph basic-graph) (vertex basic-vertex)
&key (key (vertex-key graph)) (test 'equal)
(error-if-not-found? t))
- (aif (search-for-node (graph-vertexes graph) vertex :test test :key key)
- it
- (when error-if-not-found?
- (error "~A not found in ~A" vertex graph))))
+ (or (search-for-node (graph-vertexes graph) vertex :test test :key key)
+ (when error-if-not-found?
+ (error "~A not found in ~A" vertex graph))))
(defmethod search-for-vertex ((graph basic-graph) (vertex t)
&key (key (vertex-key graph)) (test 'equal)
(error-if-not-found? t))
- (aif (search-for-element (graph-vertexes graph) vertex :test test :key key)
- it
- (when error-if-not-found?
- (error "~A not found in ~A" vertex graph))))
+ (or (search-for-element (graph-vertexes graph) vertex :test test :key key)
+ (when error-if-not-found?
+ (error "~A not found in ~A" vertex graph))))
(defmethod iterate-elements ((graph basic-graph) fn)
(iterate-elements (graph-vertexes graph)
(defmethod traverse-elements-helper ((thing basic-vertex) (style (eql :depth)) marker fn)
(when (eq (tag thing) marker)
- (nilf (tag thing))
+ (setf (tag thing) nil)
(iterate-children
thing
(lambda (vertex)
(defmethod traverse-elements-helper ((thing basic-vertex) (style (eql :breadth)) marker fn)
(when (eq (tag thing) marker)
- (nilf (tag thing))
+ (setf (tag thing) nil)
(funcall fn thing))
(iterate-neighbors
thing
(lambda (vertex)
(when (eq (tag vertex) marker)
- (nilf (tag vertex))
+ (setf (tag vertex) nil)
(traverse-elements-helper vertex style marker fn)))))
;;; ---------------------------------------------------------------------------
+;; also in metatilites
+(defun graph-search-for-cl-graph (states goal-p successors combiner
+ &key (state= #'eql) old-states
+ (new-state-fn #'new-states))
+ "Find a state that satisfies goal-p. Start with states,
+ and search according to successors and combiner.
+ Don't try the same state twice."
+ (cond ((null states) nil)
+ ((funcall goal-p (first states)) (first states))
+ (t (graph-search-for-cl-graph
+ (funcall
+ combiner
+ (funcall new-state-fn states successors state= old-states)
+ (rest states))
+ goal-p successors combiner
+ :state= state=
+ :old-states (adjoin (first states) old-states
+ :test state=)
+ :new-state-fn new-state-fn))))
+
(defmethod in-cycle-p ((graph basic-graph) (start-vertex basic-vertex))
(let ((first-time? t))
(not (null
- (graph-search
+ (graph-search-for-cl-graph
(list start-vertex)
(lambda (v)
(if first-time?
- (nilf first-time?)
+ (setf first-time? nil)
(eq (find-vertex graph v) start-vertex)))
(lambda (v)
(child-vertexes v))
&optional (marked (make-container 'simple-associative-container))
(previous nil))
(block do-it
- (tf (item-at-1 marked current))
+ (setf (item-at-1 marked current) t)
(iterate-children current
(lambda (child)
(cond
(assign-level graph 0)
(let ((depth 0))
(iterate-vertexes graph (lambda (vertex)
- (maxf depth (depth-level vertex))))
+ (when (> (depth-level vertex) depth)
+ (setf depth (depth-level vertex)))))
depth))
;;; ---------------------------------------------------------------------------