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fix filtered map

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This commit is contained in:
Bruno Windels 2021-04-27 16:15:20 +02:00
parent 396ec4dfd9
commit 025320b83e
1 changed files with 39 additions and 31 deletions
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56
src/observable/map/FilteredMap.js
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@ -28,26 +28,29 @@ export class FilteredMap extends BaseObservableMap {
setFilter(filter) {
this._filter = filter;
this.update();
if (this._subscription) {
this._reapplyFilter();
}
}
/**
* reapply the filter
*/
update() {
// TODO: need to check if we have a subscriber already? If not, we really should not iterate the source?
_reapplyFilter(silent = false) {
if (this._filter) {
const hadFilterBefore = !!this._included;
const oldIncluded = this._included;
this._included = this._included || new Map();
for (const [key, value] of this._source) {
const isIncluded = this._filter(value, key);
const wasIncluded = hadFilterBefore ? this._included.get(key) : true;
this._included.set(key, isIncluded);
if (!silent) {
const wasIncluded = oldIncluded ? oldIncluded.get(key) : true;
this._emitForUpdate(wasIncluded, isIncluded, key, value);
}
}
} else { // no filter
// did we have a filter before?
if (this._included) {
if (this._included && !silent) {
// add any non-included items again
for (const [key, value] of this._source) {
if (!this._included.get(key)) {
@ -100,7 +103,7 @@ export class FilteredMap extends BaseObservableMap {
onSubscribeFirst() {
this._subscription = this._source.subscribe(this);
this.update();
this._reapplyFilter(true);
super.onSubscribeFirst();
}
@ -111,7 +114,7 @@ export class FilteredMap extends BaseObservableMap {
}
onReset() {
this.update();
this._reapplyFilter();
this.emitReset();
}
@ -140,7 +143,7 @@ export class FilteredMap extends BaseObservableMap {
class FilterIterator {
constructor(map, _included) {
this._included = _included;
this._sourceIterator = map.entries();
this._sourceIterator = map[Symbol.iterator]();
}
next() {
@ -150,7 +153,7 @@ class FilterIterator {
if (sourceResult.done) {
return sourceResult;
}
const key = sourceResult.value[1];
const key = sourceResult.value[0];
if (this._included.get(key)) {
return sourceResult;
}
@ -158,18 +161,23 @@ class FilterIterator {
}
}
// import {ObservableMap} from "./ObservableMap.js";
// export function tests() {
// return {
// "filter preloaded list": assert => {
// const source = new ObservableMap();
// source.add("one", 1);
// source.add("two", 2);
// source.add("three", 3);
// const odds = Array.from(new FilteredMap(source, x => x % 2 !== 0));
// assert.equal(odds.length, 2);
// },
import {ObservableMap} from "./ObservableMap.js";
export function tests() {
return {
"filter preloaded list": assert => {
const source = new ObservableMap();
source.add("one", 1);
source.add("two", 2);
source.add("three", 3);
const oddNumbers = new FilteredMap(source, x => x % 2 !== 0);
// can only iterate after subscribing
oddNumbers.subscribe({});
assert.equal(oddNumbers.size, 2);
const it = oddNumbers[Symbol.iterator]();
assert.deepEqual(it.next().value, ["one", 1]);
assert.deepEqual(it.next().value, ["three", 3]);
assert.equal(it.next().done, true);
},
// "filter added values": assert => {
// },
@ -179,5 +187,5 @@ class FilterIterator {
// "filter changed values": assert => {
// },
// }
// }
}
}