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WIP - 2

This commit is contained in:
RMidhunSuresh 2022-02-18 16:07:18 +05:30
parent 66f6c4aba1
commit 04d5b9bfda
1 changed files with 44 additions and 38 deletions
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82
src/domain/navigation/Navigation.ts
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@ -34,11 +34,11 @@ type SegmentType = {
"member": string;
};
export class Navigation {
export class Navigation<T> {
private readonly _allowsChild: AllowsChild;
private _path: Path;
private readonly _observables: Map<string, SegmentObservable> = new Map();
private readonly _pathObservable: ObservableValue<Path>;
private _path: Path<T>;
private readonly _observables: Map<keyof T, SegmentObservable<T>> = new Map();
private readonly _pathObservable: ObservableValue<Path<T>>;
constructor(allowsChild: AllowsChild) {
this._allowsChild = allowsChild;
@ -46,11 +46,11 @@ export class Navigation {
this._pathObservable = new ObservableValue(this._path);
}
get pathObservable(): ObservableValue<Path> {
get pathObservable(): ObservableValue<Path<T>> {
return this._pathObservable;
}
get path(): Path {
get path(): Path<T> {
return this._path;
}
@ -61,7 +61,7 @@ export class Navigation {
}
}
applyPath(path: Path): void {
applyPath(path: Path<T>): void {
// Path is not exported, so you can only create a Path through Navigation,
// so we assume it respects the allowsChild rules
const oldPath = this._path;
@ -85,7 +85,7 @@ export class Navigation {
this._pathObservable.set(this._path);
}
observe(type: keyof SegmentType): SegmentObservable {
observe(type: keyof T): SegmentObservable<T> {
let observable = this._observables.get(type);
if (!observable) {
observable = new SegmentObservable(this, type);
@ -94,7 +94,7 @@ export class Navigation {
return observable;
}
pathFrom(segments: Segment<any>[]): Path {
pathFrom(segments: Segment<any>[]): Path<T> {
let parent: Segment<any> | undefined;
let i: number;
for (i = 0; i < segments.length; i += 1) {
@ -106,12 +106,12 @@ export class Navigation {
return new Path(segments, this._allowsChild);
}
segment<T extends keyof SegmentType>(type: T, value: SegmentType[T]): Segment<T> {
segment<K extends keyof T>(type: K, value: T[K]): Segment<T> {
return new Segment(type, value);
}
}
function segmentValueEqual(a?: SegmentType[keyof SegmentType], b?: SegmentType[keyof SegmentType]): boolean {
function segmentValueEqual<T>(a?: T[keyof T], b?: T[keyof T]): boolean {
if (a === b) {
return true;
}
@ -129,27 +129,27 @@ function segmentValueEqual(a?: SegmentType[keyof SegmentType], b?: SegmentType[k
}
export class Segment<T extends keyof SegmentType> {
export class Segment<T, K extends keyof T = any> {
constructor(
public type: T,
public value: SegmentType[T] | true = value === undefined ? true : value
public type: K,
public value: T[K] = (value === undefined ? true : value) as T[K]
) {}
}
class Path {
private readonly _segments: Segment<any>[];
class Path<T> {
private readonly _segments: Segment<T, any>[];
private readonly _allowsChild: AllowsChild;
constructor(segments: Segment<any>[] = [], allowsChild: AllowsChild) {
constructor(segments: Segment<T>[] = [], allowsChild: AllowsChild) {
this._segments = segments;
this._allowsChild = allowsChild;
}
clone(): Path {
clone(): Path<T> {
return new Path(this._segments.slice(), this._allowsChild);
}
with(segment: Segment<any>): Path | null {
with(segment: Segment<T>): Path<T> | null {
let index = this._segments.length - 1;
do {
if (this._allowsChild(this._segments[index], segment)) {
@ -164,7 +164,7 @@ class Path {
return null;
}
until(type: keyof SegmentType): Path {
until(type: keyof T): Path<T> {
const index = this._segments.findIndex(s => s.type === type);
if (index !== -1) {
return new Path(this._segments.slice(0, index + 1), this._allowsChild)
@ -172,11 +172,11 @@ class Path {
return new Path([], this._allowsChild);
}
get(type: keyof SegmentType): Segment<any> | undefined {
get(type: keyof T): Segment<T> | undefined {
return this._segments.find(s => s.type === type);
}
replace(segment: Segment<any>): Path | null {
replace(segment: Segment<T>): Path<T> | null {
const index = this._segments.findIndex(s => s.type === segment.type);
if (index !== -1) {
const parent = this._segments[index - 1];
@ -192,7 +192,7 @@ class Path {
return null;
}
get segments(): Segment<any>[] {
get segments(): Segment<T>[] {
return this._segments;
}
}
@ -201,19 +201,19 @@ class Path {
* custom observable so it always returns what is in navigation.path, even if we haven't emitted the change yet.
* This ensures that observers of a segment can also read the most recent value of other segments.
*/
class SegmentObservable extends BaseObservableValue<SegmentType[keyof SegmentType] | undefined> {
private readonly _navigation: Navigation;
private _type: keyof SegmentType;
private _lastSetValue?: SegmentType[keyof SegmentType];
class SegmentObservable<T> extends BaseObservableValue<T[keyof T] | undefined> {
private readonly _navigation: Navigation<T>;
private _type: keyof T;
private _lastSetValue?: T[keyof T];
constructor(navigation: Navigation, type: keyof SegmentType) {
constructor(navigation: Navigation<T>, type: keyof T) {
super();
this._navigation = navigation;
this._type = type;
this._lastSetValue = navigation.path.get(type)?.value;
}
get(): SegmentType[keyof SegmentType] | undefined {
get(): T[keyof T] | undefined {
const path = this._navigation.path;
const segment = path.get(this._type);
const value = segment?.value;
@ -222,7 +222,7 @@ class SegmentObservable extends BaseObservableValue<SegmentType[keyof SegmentTyp
emitIfChanged(): void {
const newValue = this.get();
if (!segmentValueEqual(newValue, this._lastSetValue)) {
if (!segmentValueEqual<T>(newValue, this._lastSetValue)) {
this._lastSetValue = newValue;
this.emit(newValue);
}
@ -249,7 +249,7 @@ export function tests() {
}
function observeTypes(nav, types) {
const changes = [];
const changes: {type:string, value:any}[] = [];
for (const type of types) {
nav.observe(type).subscribe(value => {
changes.push({type, value});
@ -258,6 +258,12 @@ export function tests() {
return changes;
}
type SegmentType = {
"foo": number;
"bar": number;
"baz": number;
}
return {
"applying a path emits an event on the observable": assert => {
const nav = createMockNavigation();
@ -275,18 +281,18 @@ export function tests() {
assert.equal(changes[1].value, 8);
},
"path.get": assert => {
const path = new Path([new Segment("foo", 5), new Segment("bar", 6)], () => true);
assert.equal(path.get("foo").value, 5);
assert.equal(path.get("bar").value, 6);
const path = new Path<SegmentType>([new Segment("foo", 5), new Segment("bar", 6)], () => true);
assert.equal(path.get("foo")!.value, 5);
assert.equal(path.get("bar")!.value, 6);
},
"path.replace success": assert => {
const path = new Path([new Segment("foo", 5), new Segment("bar", 6)], () => true);
const path = new Path<SegmentType>([new Segment("foo", 5), new Segment("bar", 6)], () => true);
const newPath = path.replace(new Segment("foo", 1));
assert.equal(newPath.get("foo").value, 1);
assert.equal(newPath.get("bar").value, 6);
assert.equal(newPath!.get("foo")!.value, 1);
assert.equal(newPath!.get("bar")!.value, 6);
},
"path.replace not found": assert => {
const path = new Path([new Segment("foo", 5), new Segment("bar", 6)], () => true);
const path = new Path<SegmentType>([new Segment("foo", 5), new Segment("bar", 6)], () => true);
const newPath = path.replace(new Segment("baz", 1));
assert.equal(newPath, null);
}