1 files changed, 96 insertions, 0 deletions
diff --git a/src/http/static/viz/1/viz/forest.cljs b/src/http/static/viz/1/viz/forest.cljs
new file mode 100644
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+++ b/src/http/static/viz/1/viz/forest.cljs
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+(ns viz.forest)
+
+(defn new-forest []
+  {:nodes {}
+   :roots #{}
+   :leaves #{}
+   :next-id 0})
+
+(defn- new-id [forest]
+  (let [id (:next-id forest)]
+    [(assoc forest :next-id (inc id))
+     id]))
+
+(defn- unset-parent [forest id parent-id]
+  (-> forest
+      (update-in [:nodes id] dissoc :parent-id :parent-pos)
+      (update-in [:nodes parent-id :child-ids] disj id)
+      (update-in [:roots] conj id)
+      (update-in [:leaves] conj parent-id)
+      ))
+
+(defn- set-parent [forest id parent-id]
+  (let [parent-pos (get-in forest [:nodes parent-id :pos])
+        prev-parent-id (get-in forest [:nodes id :parent-id])
+        ]
+    (-> forest
+        (assoc-in [:nodes id :parent-id] parent-id)
+        (assoc-in [:nodes id :parent-pos] parent-pos)
+        (update-in [:nodes parent-id :child-ids] #(if %1 (conj %1 id) #{id}))
+        (update-in [:roots] disj id)
+        (update-in [:leaves] disj parent-id)
+        ;; If there was a previous parent of the child, unset that shit
+        (#(if prev-parent-id (unset-parent %1 id prev-parent-id) %1))
+        )))
+
+(defn add-node [forest pos]
+  (let [[forest id] (new-id forest)
+        forest (-> forest
+                   (assoc-in [:nodes id] {:id id :pos pos})
+                   (update-in [:roots] conj id)
+                   (update-in [:leaves] conj id)
+                   )
+        ]
+    [forest id]))
+
+(defn remove-node [forest id]
+  (let [child-ids (get-in forest [:nodes id :child-ids])
+        parent-id (get-in forest [:nodes id :parent-id])]
+    (-> forest
+        ;; unset this node's parent, if it has one
+        (#(if parent-id (unset-parent %1 id parent-id) %1))
+        ;; unset this node's children, if it has any
+        ((fn [forest] (reduce #(unset-parent %1 %2 id) forest child-ids)))
+        ;; remove from all top-level sets
+        (update-in [:nodes] dissoc id)
+        (update-in [:roots] disj id)
+        (update-in [:leaves] disj id)
+        )))
+
+(defn get-node [forest id]
+  (get-in forest [:nodes id]))
+
+(defn spawn-child [forest parent-id pos]
+  (let [[forest id] (add-node forest pos)
+        forest (-> forest
+                   (set-parent id parent-id)
+                   )
+        ]
+    [forest id]))
+
+(defn roots [forest] (-> forest :nodes (select-keys (:roots forest)) (vals)))
+(defn root? [node] (not (boolean (:parent-id node))))
+
+(defn leaves [forest] (-> forest :nodes (select-keys (:leaves forest)) (vals)))
+(defn leaf? [node] (empty? (:child-ids node)))
+
+(defn lines [forest]
+  (->> forest
+       (:nodes)
+       (vals)
+       (remove #(empty? (:parent-pos %)))
+       (map #(vector (:pos %) (:parent-pos %)))
+       ))
+
+(def my-forest
+  (let [forest (new-forest)
+        [forest id0] (add-node forest [0 0])
+        [forest id1] (spawn-child forest id0 [1 1])
+        [forest id2] (spawn-child forest id0 [-1 -1])
+        [forest id3] (spawn-child forest id1 [2 2])
+        forest (remove-node forest id1)
+        ]
+    forest))
+
+(identity my-forest)
+(lines my-forest)