ENH remove all floating node logic (not sure what I was thinking)
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@ -43,6 +43,37 @@ The type of WHAT will determine how the hash table is build:
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((numberp what) (make-hash-table :size what :test #'equal))
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(t (ht<-alist what #'equal))))
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(defun dag--bimap-create (init)
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"Create a bidirectional adjacency list.
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INIT is an alist where the car is a child key and the cdr is the
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parent keys for that child."
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(let ((ht-child (dag--ht-create nil))
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(ht-parent (dag--ht-create nil))
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key parents)
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(--each init
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(setq key (car it)
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parents (cdr it))
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(ht-set ht-child key parents)
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(ht-set ht-parent key nil))
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(--each init
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(setq key (car it)
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parents (cdr it))
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(while parents
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(->> (ht-get ht-parent (car parents))
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(cons key)
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(ht-set ht-parent (car parents)))
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(!cdr parents)))
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(list :parent ht-parent :child ht-child)))
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;; (defun dag--bimap-remove (keys bimap)
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;; (-let (((&plist :parent :child) bimap))
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;; (--each keys
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;; (--each (ht-get child it)
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;; (ht-set parent it (remove it it))
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;; (ht-remove child it)
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;; (ht-remove parent it))))))
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(defun dag--plist-cons (plist prop x)
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(plist-put plist prop (cons x (plist-get plist prop))))
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@ -130,24 +161,6 @@ The type of WHAT will determine how the hash table is build:
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(when (--all-p (= 0 it) (ht-values parent-degrees))
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(nreverse ordered-nodes))))
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(defun dag--get-floating (adjlist init)
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;; Find 'floating nodes', which are nodes that have no children or parents
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;; (this will happen if the original alist has node keys that aren't
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;; referenced by any parents).
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;;
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;; O(N)
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(let ((acc (or init (dag--ht-create nil)))
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cur)
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(dag--each-key adjlist
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(setq cur (ht-get adjlist it))
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;; If adjlist key has parents and/or children, remove it from the floating
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;; if present, otherwise add it to floating and remove it from adjlist
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(if (or (plist-get cur :children) (plist-get cur :parents))
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(ht-remove acc it)
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(ht-remove adjlist it)
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(ht-set acc it t)))
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(list adjlist acc)))
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(defun dag--alist-to-ht (parent-adjlist)
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(let ((h (dag--ht-create parent-adjlist))
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(broken-edges (dag--ht-create nil))
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@ -218,14 +231,10 @@ The type of WHAT will determine how the hash table is build:
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(setq order (cdr order)))
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extra-edges))
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(defun dag--create (adjlist broken-edges floating)
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;; TODO this floating this is probably not necessary; it automatically makes
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;; any algorithm using this function at least O(N)
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(-let (((a f) (dag--get-floating adjlist floating)))
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(list :adjlist a
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(defun dag--create (adjlist broken-edges)
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(list :adjlist adjlist
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:broken-edges broken-edges
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:floating-nodes f
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:order (dag--get-topological-order adjlist))))
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:order (dag--get-topological-order adjlist)))
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(defun dag--prune-broken-edges (broken-edges)
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(dag--each-key broken-edges
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@ -233,15 +242,14 @@ The type of WHAT will determine how the hash table is build:
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(ht-remove broken-edges it)))
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broken-edges)
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(defun dag--adjlist-remove-nodes (to-remove adjlist broken-edges floating)
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(defun dag--adjlist-remove-nodes (to-remove adjlist broken-edges)
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(let (r r-rel child-rel)
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(while to-remove
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;; If the node to be removed is in the adjacency list, get a list of its
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;; parents, remove the node from the child list of each parent, then
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;; delete the node itself. Otherwise try to delete if from floating nodes.
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;; delete the node itself.
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(setq r (car to-remove))
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(if (not (setq r-rel (ht-get adjlist r)))
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(ht-remove floating r)
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(when (setq r-rel (ht-get adjlist r))
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(--each (plist-get r-rel :parents)
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(when (and (not (member it to-remove)) (ht-contains-p adjlist it))
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(dag--adjlist-remove-child-edge it r adjlist)))
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@ -258,7 +266,7 @@ The type of WHAT will determine how the hash table is build:
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;; presence in the adjacency list
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(ht-remove broken-edges r)
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(!cdr to-remove)))
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(list adjlist broken-edges floating))
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(list adjlist broken-edges))
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(defmacro dag--intersection-difference (xs ys &optional zs)
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"Calculate the intersection and difference of XS and YS.
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@ -370,29 +378,29 @@ keys.
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Return a DAG object."
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(-let (((a b) (dag--alist-to-ht parent-adjlist)))
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(dag--create a b nil)))
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(dag--create a b)))
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(defun dag-empty ()
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"Return an empty DAG."
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(dag--create (dag--ht-create nil) (dag--ht-create nil) nil))
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(dag--create (dag--ht-create nil) (dag--ht-create nil)))
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(defun dag-remove-nodes (to-remove dag)
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(-let (((&plist :adjlist a :broken-edges b :floating-nodes f) dag))
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(->> (dag--adjlist-remove-nodes to-remove a b f)
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(-let (((&plist :adjlist a :broken-edges b) dag))
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(->> (dag--adjlist-remove-nodes to-remove a b)
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(apply #'dag--create))))
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(defun dag-insert-nodes (to-insert dag)
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(-let* (((&plist :adjlist a :broken-edges b :floating-nodes f) dag)
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(-let* (((&plist :adjlist a :broken-edges b) dag)
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((a* b*) (dag--adjlist-insert-nodes to-insert a b)))
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(dag--create a* b* f)))
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(dag--create a* b*)))
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(defun dag-edit-nodes (to-remove to-insert dag)
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(if (not (or to-remove to-insert)) dag
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(-let* ((to-remove* (-difference to-remove (-map #'car to-insert)))
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((&plist :adjlist a :broken-edges b :floating-nodes f) dag)
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((a* b* f*) (dag--adjlist-remove-nodes to-remove a b f))
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((&plist :adjlist a :broken-edges b) dag)
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((a* b*) (dag--adjlist-remove-nodes to-remove a b))
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((a** b**) (dag--adjlist-insert-nodes to-insert a* b*)))
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(dag--create a** b** f*))))
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(dag--create a** b**))))
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(defun dag-get-adjacency-list (dag)
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(plist-get dag :adjlist))
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@ -400,9 +408,6 @@ Return a DAG object."
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(defun dag-get-broken-edges (dag)
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(plist-get dag :broken-edges))
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(defun dag-get-floating-nodes (dag)
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(plist-get dag :floating-nodes))
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(defun dag-get-topological-order (dag)
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(plist-get dag :order))
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@ -415,9 +420,7 @@ Return a DAG object."
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(< 0 (dag-get-length dag)))
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(defun dag-is-empty-p (dag)
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(= 0
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(ht-size (dag-get-adjacency-list dag))
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(ht-size (dag-get-floating-nodes dag))))
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(= 0 (ht-size (dag-get-adjacency-list dag))))
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(defun dag-get-node (key dag)
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(-some-> (dag-get-adjacency-list dag)
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@ -444,14 +447,6 @@ Return a DAG object."
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(when ,form (!cons (cons it it-rel) acc)))
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acc))
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(defmacro dag-get-floating-nodes-where (dag form)
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(declare (indent 1))
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`(let ((it-adjlist (dag-get-floating-nodes ,dag))
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acc)
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(dag--each-key it-adjlist
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(when ,form (!cons it acc)))
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acc))
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(defun dag-get-leaf-nodes (dag)
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(dag-get-nodes-and-edges-where dag
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(not (dag--adjlist-get-children it it-adjlist))))
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