Array.prototype.shuffle = function () {
- return this.sort(() => {return .5 - Math.random()});
+ for (let i = this.length - 1; i > 0; i--) {
+ const j = Math.floor(Math.random() * (i + 1)); // random index 0..i
+ [this[i], this[j]] = [this[j], this[i]]; // swap elements
+ }
+ return this;
+};
+
+Set.prototype.filter = function (f) {
+ return new Set([...this].filter(f));
};
class WordQuiz {
dataselect(json) {
- let rows = Object.values(json);
+ this.data = this.datafilter(json);
+ let rows = Object.values(this.data);
+ rows = rows.filter(row => !row[3].length); // remove referenced categories
return rows.shuffle();
}
+ datafilter(json) {
+ // find viable rows from json data
+ let ids = new Set(Object.keys(json));
+ const selection = {...json}; // clone
+
+ if (this.preset.cat !== undefined) {
+ ids.clear();
+ let children = [this.preset.cat];
+ for (let loop = 0; children.length && loop < 20; loop++) {
+ for (let child of children) ids.add(child.toString());
+ children = children.map(cat => json[cat][3]).filter(is => is).flat()
+ }
+ }
+ if (this.preset.image) {
+ ids = ids.filter(id => json[id][2]);
+ }
+ if (this.preset.level !== undefined) {
+ ids = ids.filter(id => json[id][1] <= this.preset.level);
+ }
+
+ // keep only wanted ids
+ for (let id in selection) {
+ if (id && !ids.has(id)) {
+ delete selection[id];
+ }
+ }
+
+ // retain orphaned references in grandparent categories
+ for (let id in selection) {
+ selection[id][3] = function subresolve(subs) {
+ //console.log(subs);
+ return (subs || []).flatMap(sub =>
+ sub in selection ? [sub] : subresolve(json[sub][3])
+ );
+ }(selection[id][3]);
+ }
+ return selection;
+ }
+
load(dataurl) {
+ this.preset = {};
+ let input;
+ if (input = window.location.hash.match(/\d+/)) {
+ this.preset.cat = parseInt(input[0]);
+ }
+ if (window.location.hash.match(/a/)) {
+ this.preset.level = 3;
+ }
+
fetch(dataurl).then(res => res.json()).then(json => {
this.words = this.dataselect(json)
this.setup();
});
}
+ log(...args) {
+ this.history.push([new Date().toISOString(), ...args]);
+ }
+
+ stop(...args) {
+ this.log(...args);
+ window.onbeforeunload = null;
+ fetch('/word/report', {method: 'POST', body: JSON.stringify(this.history)});
+ }
+
constructor(dataurl) {
this.load(dataurl);
+ this.history = [];
+ window.onbeforeunload = e => {
+ this.stop('abort');
+ };
}
}