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- (ns microtables-frontend.core
- (:require
- [reagent.core :as r]
- ["mathjs" :as mathjs]))
- ; to generate random values
- ;for(let i = 0, s = new Set(); i < 10; i++){ let r = Math.floor(Math.random() * 15)+1, c = a[Math.floor(Math.random() * a.length)], k = `${c}${r}`; if(s.has(k)){ i--; continue; } s.add(k); v.push(`{:row ${r} :col "${c}" :value "${Math.floor(Math.random() * 10000)}"}`); }
- (def sample-data [{:row 1 :col "A" :value "59" :view :display}
- {:row 5 :col "C" :value "269" :view :display}
- {:row 4 :col "B" :value "7893" :view :display}
- {:row 2 :col "F" :value "8650" :view :display}
- {:row 6 :col "D" :value "4065" :view :display}
- {:row 7 :col "F" :value "5316" :view :display}
- {:row 12 :col "A" :value "2405" :view :display}
- {:row 5 :col "B" :value "7863" :view :display}
- {:row 9 :col "E" :value "3144" :view :display}
- {:row 10 :col "D" :value "8272" :view :display}
- {:row 11 :col "D" :value "2495" :view :display}
- {:row 15 :col "E" :value "8968" :view :display}
- {:row 7 :col "B" :value "=C5 + D6" :view :display}
- {:row 8 :col "B" :value "=B7 * 2" :view :display}
- {:row 7 :col "C" :value "=D1" :view :display}
- {:row 12 :col "B" :value "=C12" :view :display}])
- (defonce data-atom (r/atom sample-data))
- (defn highest [dir data] (apply max (map dir data)))
- ; COLUMN NAMES
- (defn upgrade-letter-code [s]
- (let [l (last s)]
- (cond
- (empty? s) [65]
- (= l 90) (conj (upgrade-letter-code (subvec s 0 (dec (count s)))) 65)
- :else (conj (subvec s 0 (dec (count s))) (inc l)))))
- (defn next-letter [lc]
- (apply str (map char (upgrade-letter-code (mapv #(.charCodeAt % 0) lc)))))
- (def col-letters (iterate next-letter "A"))
- ; CHANGE VALUE FUNCTIONS
- (defn update-value [c r existing-datum value]
- (if (nil? existing-datum)
- (swap! data-atom conj {:row r :col c :value value :dirty true})
- (swap! data-atom (partial map #(if (and (= r (:row %)) (= c (:col %))) (assoc (assoc % :dirty true) :value value) %)))))
- ;TODO: consider changing this for a single "view" atom which points to zero or one cells, which will determine whether to show the formula or evaluation
- (defn toggle-display [data c r view-mode]
- (println (str " toggling " c r " to " view-mode))
- (map #(if (and (= r (:row %)) (= c (:col %))) (assoc % :view view-mode) %) data))
- ; CALCULATION / FORMULA EVALUATION FUNCTIONS
- (def parse-variables (memoize (fn [expression]
- (js->clj (.getVariables mathjs expression)))))
- (def evaluate-expression (memoize (fn [expression variables]
- (.evaluate mathjs expression (clj->js variables)))))
- (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}))))
- ;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: figure out how to re-evaluate only when the cell modified affects other cells
- (defn re-evaluate [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] (assoc datum :inputs (apply hash-map (interleave (:vars datum) (:found datum))))) 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)]
- (if (nil? not-ready)
- updated-values
- (recur updated-values not-ready))))))
- (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))
- (defn on-enter-cell [c r e]
- (println (str "entering cell " c r))
- (swap! data-atom #(toggle-display % c r :value)))
- (defn on-leave-cell [c r e]
- (println (str "leaving cell " c r))
- (swap! data-atom #(as-> % data
- (toggle-display data c r :display)
- (add-parsed-variables-to-specific-datum c r data)
- (re-evaluate data))))
- ;; -------------------------
- ;; Views
- (defn cell [c r data]
- (let [datum (some #(if (and (= c (:col %)) (= r (:row %))) %) data)]
- ^{:key (str c r)} [:td [:input {:value (if (= (get datum :view nil) :value)
- (get datum :value "")
- (get datum :error (get datum :display (get datum :value ""))))
- :on-change #(update-value c r datum (.. % -target -value))
- :on-blur (partial on-leave-cell c r)
- :on-focus (partial on-enter-cell c r)}]]))
- (defn row [r cols data]
- ^{:key (str "row-" r)} [:tr
- (cons
- ^{:key (str "row-head-" r)} [:th (str r)]
- (map #(cell % r data) cols))])
- (defn header-row [cols]
- ^{:key "header"} [:tr
- (cons
- ^{:key "corner"} [:th]
- (map (fn [c] ^{:key (str "col-head-" c)} [:th c]) cols))])
- (defn sheet [data]
- [:table [:tbody
- (let [maxrow (highest :row data)
- cols (take-while (partial not= (next-letter (highest :col data))) col-letters)]
- (cons
- (header-row cols)
- (map #(row % cols data) (range 1 (inc maxrow)))))]])
- (defn app []
- [:div
- [:h3 "Microtables"]
- [sheet @data-atom]])
- ;; -------------------------
- ;; Initialize app
- (swap! data-atom #(->> % (map add-parsed-variables) (re-evaluate))) ; evalutate any formulas the first time
- (defn mount-root []
- (r/render [app] (.getElementById js/document "app")))
- (defn init! []
- (mount-root))
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