return this;
};
+Set.prototype.filter = function (f) {
+ return new Set([...this].filter(f));
+};
+
class WordQuiz {
dataselect(json) {
- this.data = json;
- this.cats = {}; // category lookup
- for (let i in json) {
- let cat = json[i][3];
- if (this.cats[cat]) {
- this.cats[cat].push(i);
- }
- else {
- this.cats[cat] = [i];
- }
- }
- return this.datafilter(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 rows = Object.values(json);
+ let ids = new Set(Object.keys(json));
+ const selection = {...json}; // clone
if (this.preset.cat !== undefined) {
- rows = [];
- let children = this.cats[this.preset.cat];
+ ids.clear();
+ let children = [this.preset.cat];
for (let loop = 0; children.length && loop < 20; loop++) {
- rows.push(...children);
- children = children.map(cat => this.cats[cat]).filter(is => is).flat();
+ for (let child of children) ids.add(child.toString());
+ children = children.map(cat => json[cat][3]).filter(is => is).flat()
}
- rows = rows.map(row => json[row]).filter(row => row[2]);
+ }
+ if (this.preset.image) {
+ ids = ids.filter(id => json[id][2]);
}
if (this.preset.level !== undefined) {
- rows = rows.filter(row => row[1] <= this.preset.level);
+ ids = ids.filter(id => json[id][1] <= this.preset.level);
}
- {
- let cats = new Set();
- let subcats = rows.map(row => row[3]); // direct parents
- for (let loop = 0; subcats.length && loop < 20; loop++) {
- subcats.forEach(cat => cats.add(cat));
- subcats = subcats.map(row => json[row] && json[row][3]).filter(val => val); // recurse grandparents
+ // keep only wanted ids
+ for (let id in selection) {
+ if (id && !ids.has(id)) {
+ delete selection[id];
}
- rows = rows.filter(row => !cats.has(row[2])); // remove referenced categories
}
- return rows.shuffle();
+
+ // 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 = input[0];
+ this.preset.cat = parseInt(input[0]);
}
if (window.location.hash.match(/a/)) {
this.preset.level = 3;