106 lines
2.3 KiB
JavaScript
106 lines
2.3 KiB
JavaScript
import {compose, EventEmitter, TickingPromise} from '@avocado/core';
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import {Traversal} from './traversal';
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import {Traversals} from './traversals';
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const decorate = compose(
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EventEmitter,
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);
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export class Actions extends decorate(Traversals) {
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constructor() {
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super();
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this._index = 0;
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this._actionPromise = null;
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}
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emitFinished() {
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this.emit('actionsFinished');
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}
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get index() {
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return this._index;
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}
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set index(index) {
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this._index = index;
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}
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get() {
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return this;
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}
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tick(context, elapsed) {
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// Empty resolves immediately.
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if (this.traversals.length === 0) {
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this.emitFinished();
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return;
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}
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// If the action promise ticks, tick it.
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if (this._actionPromise && this._actionPromise instanceof TickingPromise) {
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this._actionPromise.tick(elapsed);
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return;
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}
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// Actions execute immediately until a promise is made, or they're all
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// executed.
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while (true) {
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// Run the action.
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const result = this.traversals[this.index].traverse(context);
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// Deferred result.
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if (result instanceof Promise) {
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this._actionPromise = result;
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// Handle any errors.
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result.catch(console.error);
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result.finally(() => {
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// Finally, run the prologue.
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this.prologue();
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});
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break;
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}
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// Immediate result.
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this.prologue();
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// Need to break out immediately if required.
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if (0 === this.index) {
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break;
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}
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}
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}
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parallel(context) {
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// Map all traversals to results.
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const results = this.traversals.map((traversal) => {
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return traversal.traverse(context);
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});
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// Wrap all results in a TickingPromise.
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return TickingPromise.all(results);
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}
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prologue() {
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// Clear out the action promise.
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this._actionPromise = null;
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// Increment and wrap the index.
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this.index = (this.index + 1) % this.traversals.length;
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// If rolled over, the actions are finished.
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if (0 === this.index) {
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this.emitFinished();
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}
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}
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serial(context) {
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return this.tickingPromise(context);
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}
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tickingPromise(context) {
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return new TickingPromise(
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(resolve) => {
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this.once('actionsFinished', resolve);
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},
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(elapsed) => {
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this.tick(context, elapsed);
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},
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);
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}
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}
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