WIP: ported existing functionality from old frontend to re-frame

There is an error with referenced cells re-evaluating "one step behind"

frontend/package-lock.json

@@ -2,6 +2,471 @@
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+      "integrity": "sha512-HxJdYWq1MTIQbJ3nw0cqssHoTNU267KlrDuGZ1WYlxDStUtKUhOaJmh112/TZmHxxUfuJqPXSOm7tDyas0OSIQ==",
+      "dev": true,
+      "requires": {
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+    "ws": {
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+      "resolved": "https://registry.npmjs.org/ws/-/ws-3.3.3.tgz",
+      "integrity": "sha512-nnWLa/NwZSt4KQJu51MYlCcSQ5g7INpOrOMt4XV8j4dqTXdmlUmSHQ8/oLC069ckre0fRsgfvsKwbTdtKLCDkA==",
+      "dev": true,
+      "requires": {
+        "async-limiter": "~1.0.0",
+        "safe-buffer": "~5.1.0",
+        "ultron": "~1.1.0"
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+    "xtend": {
+      "version": "4.0.2",
+      "resolved": "https://registry.npmjs.org/xtend/-/xtend-4.0.2.tgz",
+      "integrity": "sha512-LKYU1iAXJXUgAXn9URjiu+MWhyUXHsvfp7mcuYm9dSUKK0/CjtrUwFAxD82/mCWbtLsGjFIad0wIsod4zrTAEQ==",
+      "dev": true
     }
   }
 }

frontend/package.json

@@ -3,6 +3,7 @@
     "shadow-cljs": "2.8.83"
   },
   "dependencies": {
+    "mathjs": "7.0.1",
     "react": "16.9.0",
     "react-dom": "16.9.0"
   }

frontend/resources/public/index.html

@@ -4,6 +4,7 @@
     <meta charset='utf-8'>
     <meta name="viewport" content="width=device-width,initial-scale=1">
     <title>microtables-frontend</title>
+    <link rel="stylesheet" href="site.css">
   </head>
   <body>
     <noscript>

frontend/resources/public/site.css

@@ -0,0 +1,121 @@
+body {
+  font-family: 'Helvetica Neue', Verdana, Helvetica, Arial, sans-serif;
+  max-width: 600px;
+  margin: 0 auto;
+  padding-top: 72px;
+  -webkit-font-smoothing: antialiased;
+  font-size: 1.125em;
+  color: #333;
+  line-height: 1.5em;
+}
+
+h1, h2, h3 {
+  color: #000;
+}
+h1 {
+  font-size: 2.5em
+}
+
+h2 {
+  font-size: 2em
+}
+
+h3 {
+  font-size: 1.5em
+}
+
+a {
+  text-decoration: none;
+  color: #09f;
+}
+
+a:hover {
+  text-decoration: underline;
+}
+
+table {
+    border-collapse: collapse;
+}
+
+td, th {
+    border: 1px solid black;
+    padding: 0;
+}
+th {
+    text-align: center;
+    min-width: 40px;
+}
+td {
+    text-align: right;
+    position: relative;
+}
+
+td input {
+    border: none;
+    padding: 5px;
+    width: 80px;
+}
+td input:hover {
+    background-color: #ccc;
+}
+td input:focus {
+    background-color: #ccf;
+}
+td input:not(:focus) {
+    text-align: right;
+}
+
+
+.smartborder {
+    width: calc(100% + 2px);
+    height: calc(100% + 2px);
+    border: 3px solid blue;
+    position: absolute;
+    left: -4px;
+    top: -4px;
+    background: none;
+    z-index: 999;
+    /*pointer-events: none;*/
+}
+
+td input:not(:focus) + .smartborder {
+    visibility: hidden;
+}
+
+
+.smartborder .button {
+    --button-size: 20px;
+    --half-button-size: 10px;
+    /*pointer-events: all;/* TODO check this (what is "initial"?) */
+    width: var(--button-size);
+    height: var(--button-size);
+    background-color: blue;
+    color: white;
+    border-radius: var(--half-button-size);
+    position: absolute;
+}
+.extendrange.button {
+    left: 100%;
+    top: 100%;
+}
+.fillrange.button {
+    top: 100%;
+    left: calc(50% - var(--half-button-size));
+}
+.moverange.button {
+    top: calc(50% - var(--half-button-size));
+    left: calc(0px - var(--button-size));
+}
+.emptyrange.button {
+    top: calc(0px - var(--button-size));
+    left: calc(100% - var(--button-size) - 5px);
+}
+.deleterange.button {
+    top: calc(0px - var(--button-size));
+    left: 100%;
+}
+.copyrange.button {
+    top: calc(0px - var(--button-size));
+    left: 0;
+}
+

frontend/src/cljs/microtables_frontend/db.cljs

@@ -1,7 +1,7 @@
 (ns microtables-frontend.db)
 
 (def default-db
-  {:name "re-frame"
+  {
    ;TODO: add "start" and "end" corners as selection
    :position {:cursor nil
               :selection nil}

frontend/src/cljs/microtables_frontend/events.cljs

@@ -5,26 +5,39 @@
    [microtables-frontend.utils :as utils]))
 
 
+
+
 (re-frame/reg-event-db
  ::initialize-db
  (fn [_ _]
-   db/default-db))
+   (println "initializing db")
+   (-> db/default-db
+       (update-in [:table-data] (partial map utils/add-parsed-variables))
+       (update-in [:table-data] utils/re-evaluate))))
 
 
 (re-frame/reg-event-db
   ::movement-enter-cell
   (fn [db [_ c r]]
     (println "::movement-enter-cell" c r)
-    (assoc-in db [:position :cursor] {:c c :r r})))
+    (assoc-in db [:position :cursor] {:col c :row r})))
+
+
+(defn re-evaluate-if-dirty [db dirty]
+  (if dirty
+    (update-in db [:table-data] utils/re-evaluate)
+    db))
 
 (re-frame/reg-event-db
   ::movement-leave-cell
   (fn [db [_ c r]]
     (let [datum (utils/get-datum (:table-data db) c r)]
-      (println "::movement-leave-cell" c r "dirty?" (true? (:dirty datum)))
+      (println "::movement-leave-cell" c r (if (:dirty datum) "- dirty" ""))
       (-> db
           (assoc-in [:position :cursor] nil)
-          (assoc-in [:position :selection] nil)))))
+          (assoc-in [:position :selection] nil)
+          (update-in [:table-data] (partial utils/add-parsed-variables-to-specific-datum c r))
+          (re-evaluate-if-dirty (:dirty datum))))))
 
 
 (re-frame/reg-event-db

frontend/src/cljs/microtables_frontend/subs.cljs

@@ -2,16 +2,20 @@
   (:require
    [re-frame.core :as re-frame]))
 
-(re-frame/reg-sub
- ::name
- (fn [db]
-   (:name db)))
 
-;TODO: insert display mode data?
+;TODO: insert other display mode data? ("value": formula (cursor), "display" (default): evaluated, "highlighted": in a selection (just a class?))
 (re-frame/reg-sub
   ::table-data
   (fn [db]
     (println "returning table data")
-    (:table-data db)))
+    (let [data (:table-data db)
+          cursor (get-in db [:position :cursor])]
+      (if cursor
+        (map #(if (and
+                    (= (:row cursor) (:row %))
+                    (= (:col cursor) (:col %)))
+                (assoc % :view :value)
+                %) data)
+        data))))
 
 

frontend/src/cljs/microtables_frontend/utils.cljs

@@ -1,4 +1,10 @@
-(ns microtables-frontend.utils)
+(ns microtables-frontend.utils
+  (:require
+   ["mathjs" :as mathjs]))
+
+; to add an npm package to shadow-cljs:
+; https://clojureverse.org/t/guide-on-how-to-use-import-npm-modules-packages-in-clojurescript/2298
+; https://shadow-cljs.github.io/docs/UsersGuide.html#npm
 
 (defn highest [dir data] (apply max (map dir data)))
 
@@ -19,4 +25,106 @@
 (defn get-datum [data c r]
   (some #(if (and (= c (:col %)) (= r (:row %))) %) data))
 
+(def parse-variables (memoize (fn [expression]
+                                (as-> (js->clj (.parse mathjs expression)) $
+                                  (.filter $ #(true? (.-isSymbolNode %)))
+                                  (map #(.-name %) $)
+                                  (map #(.toUpperCase %) $)
+                                  (filter #(re-matches #"[A-Z]+[0-9]+" %) $)))))
+
+(def str->rc (memoize (fn [s]
+                        (let [c (re-find #"^[A-Z]+" s)
+                              r (.parseInt js/window (re-find #"[0-9]+$" s))]
+                          {:row r :col c}))))
+
+(defn add-parsed-variables [datum]
+  (if (= (first (:value datum)) "=")
+    (let [vars (parse-variables (subs (:value datum) 1))
+          refs (map str->rc vars)]
+      (-> datum (assoc :vars vars) (assoc :refs refs) (dissoc :error)))
+    (-> datum (dissoc :vars) (dissoc :refs) (dissoc :display) (dissoc :error))))
+
+(defn add-parsed-variables-to-specific-datum
+  "Parse variables from the value of a datum and add in :vars and :refs (for swap! data-atom).
+  If the value does not contain a fomula, remove any :vars and :refs that may have been there."
+  [c r data] (map #(if (and (= (:col %) c) (= (:row %) r))
+                     (add-parsed-variables %)
+                     %) data))
+
+
+(def evaluate-expression (memoize (fn [expression variables]
+                                    (try
+                                      (.evaluate mathjs expression (clj->js variables))
+                                      (catch js/Error e
+                                        (println "mathjs evaluation error" (.-message e) e)
+                                        :calc-error)))))
+
+;TODO: deal with lowercase cell references
+(defn find-cell [data c r]
+  (some #(if (and (= (:col %) c) (= (:row %) r)) %) data))
+(defn find-ref [data cell-ref]
+  (some (fn [{:keys [row col] :as datum}] (if (and (= row (:row cell-ref)) (= col (:col cell-ref))) datum)) data))
+(defn copy-display-values [data display-values]
+  (let [original (map #(dissoc % :dirty) data)
+        removed (map #(-> % (dissoc :found) (dissoc :inputs) (dissoc :dirty)) display-values)]
+    (into original removed)))
+
+;TODO: memoize dynamically? probably not worth memoizing directly, and could take up too much memory over time
+;      https://stackoverflow.com/a/13123571/8172807
+(defn find-cycle
+  ([data datum] (find-cycle data datum #{}))
+  ([data datum ances]
+   (let [cur {:row (:row datum) :col (:col datum)}
+         this-and-above (conj ances cur)
+         refs (:refs datum)
+         found (not (empty? (clojure.set/intersection this-and-above (set refs))))]
+     (if found
+       :cycle-error
+       (some (fn [cell]
+               (find-cycle data (find-ref data cell) this-and-above)) refs)))))
+
+(defn find-val [data c r]
+  (let [l (find-cell data c r)
+        v (get l :display (get l :value))
+        formula? (and (string? v) (= (first v) "="))]
+    (cond
+      (nil? v) 0
+      ;(contains? l :error) :ref-error
+      formula? :not-yet
+      :else v)))
+
+;TODO: ADD DOCSTRINGS TO ALL CONNECTED FUNCTIONS AND RENAME VARIABLES WHERE NEEDED
+;TODO: figure out how to re-evaluate only when the cell modified affects other cells
+(defn re-evaluate [data]
+  (println "re-evaluating" data)
+  (let [{has-formula true original-values false} (group-by #(= (first (:value %)) "=") data)
+        found-cycles (map #(let [found (find-cycle data %)] (if found (assoc % :error found) %)) has-formula)
+        {eligible true ineligible false} (group-by #(not (contains? %  :error)) found-cycles)]
+    ; 
+    (loop [values (into original-values ineligible)
+           mapped-cell-keys eligible]
+      (let [search-values (map (fn [datum]
+                                 (assoc datum :found (map #(find-val
+                                                             (concat values mapped-cell-keys)
+                                                             (:col %)
+                                                             (:row %))
+                                                          (:refs datum))))
+                               mapped-cell-keys)
+            {not-ready true ready nil} (group-by (fn [datum]
+                                                   (some #(= :not-yet %) (:found datum)))
+                                                 search-values)
+            prepped-for-eval (map (fn [datum]
+                                    (let [hash-map-of-vars-to-vals (apply hash-map (interleave (:vars datum) (:found datum)))]
+                                      (assoc datum :inputs hash-map-of-vars-to-vals)))
+                                  ready)
+            evaluated (map (fn [datum]
+                             (assoc datum :display (evaluate-expression
+                                                     (subs (:value datum) 1)
+                                                     (:inputs datum))))
+                           prepped-for-eval)
+            updated-values (copy-display-values values evaluated)]
+        (println "EVALUATED" evaluated)
+        (if (nil? not-ready)
+          updated-values
+          (recur updated-values not-ready))))))
 

frontend/src/cljs/microtables_frontend/views.cljs

@@ -17,7 +17,7 @@
                                          (get datum :error (get datum :display (get datum :value ""))));TODO: add "highlight" display mode (possibly just a css class)
                                 :on-change #(re-frame/dispatch [::events/edit-cell-value c r datum (.. % -target -value)])
                                 :on-focus #(re-frame/dispatch [::events/movement-enter-cell c r])
-                                ;TODO: add "dirty" value to pass to on-blur
+                                ;TODO: add "dirty" value to pass to on-blur (maybe not necessary??)
                                 :on-blur #(re-frame/dispatch [::events/movement-leave-cell c r])}]]))
 
 (defn row [r cols data]
@@ -46,12 +46,9 @@
 
 
 (defn main-panel []
-  (let [name (re-frame/subscribe [::subs/name])
-        data (re-frame/subscribe [::subs/table-data])]
+  (let [data (re-frame/subscribe [::subs/table-data])]
     [:div
-     [:h1 "Hello from " @name]
-     [:div
-      [:h1 "Microtables"]
-      [sheet @data]]]))
+     [:h1 "Microtables"]
+     [sheet @data]]))