+ *random() {
+ let order = [...this.visible.keys()].shuffle();
+ for (let i of order) {
+ if (!this.has(i)) {
+ continue;
+ }
+ yield this.get(i);
+ }
+ }
+
+ has(id) {
+ return this.visible.has(id);
+ }
+
+ subs(id) {
+ let refs = this.data[id][3];
+ if (!refs) {
+ return [];
+ }
+ for (let ref of refs) {
+ // retain orphaned references in grandparent categories
+ if (!this.has(ref)) {
+ refs = refs.concat(this.subs(ref));
+ }
+ }
+ return refs;
+ }
+
+ get(id) {
+ if (!this.has(id)) {
+ return;
+ }
+ const p = this;
+ const row = this.data[id];
+ return row && {
+ id: id,
+ title: row[0],
+ get label() {
+ return row[0].replace(/\/.*/, ''); // primary form
+ },
+ level: row[1],
+ imgid: row[2],
+ thumb(size = 32) {
+ return `/data/word/${size}/${row[2]}.jpg`;
+ },
+ get subs() {
+ return p.subs(id).map(e => p.get(e));
+ },
+ };
+ }
+}
+
+class WordQuiz {
+ dataselect(json) {
+ this.data = this.datafilter(json);
+ return [...this.data.random()];
+ }
+
+ datafilter(json) {
+ // find viable rows from json data
+ const selection = new Words(json, this.preset.cat);
+
+ if (this.preset.images) {
+ selection.filter(id => json[id][2]);
+ }
+ if (this.preset.level !== undefined) {
+ selection.filter(id => json[id][1] <= this.preset.level);
+ }
+
+ if (this.preset.distinct) {
+ // remove referenced categories
+ selection.filter(id => !selection.get(id).subs.length);
+ }
+
+ return selection;
+ }
+
+ configure(params = hashparams()) {
+ const opts = new Map(params.map(arg => arg.split(/[:=](.*)/)));
+ for (let [query, val] of opts) {
+ if (query.match(/^\d+$/)) {
+ this.preset.cat = [parseInt(query)];
+ }
+ else if (query === 'level') {
+ this.preset.level = parseInt(val);
+ }
+ else {
+ this.preset[query] = val;
+ }
+ }
+ this.preset.dataurl = `/data/wordlist.${this.preset.lang}.json`
+ }
+
+ setup() {
+ this.form = document.getElementById('quiz');
+ }
+
+ load() {
+ this.configure();
+ fetch(this.preset.dataurl).then(res => res.json()).then(json => {
+ this.words = this.dataselect(json)
+ this.setup();