51 lines
1.3 KiB
JavaScript
51 lines
1.3 KiB
JavaScript
import Ecs from '@/ecs/ecs.js';
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import Script from '@/util/script.js';
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import {LRUCache} from 'lru-cache';
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const cache = new LRUCache({
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max: 128,
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});
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export default class ClientEcs extends Ecs {
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async readAsset(uri) {
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if (!cache.has(uri)) {
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let promise, resolve, reject;
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promise = new Promise((res, rej) => {
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resolve = res;
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reject = rej;
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});
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cache.set(uri, promise);
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fetch(new URL(uri, window.location.origin))
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.then(async (response) => {
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resolve(response.ok ? response.arrayBuffer() : new ArrayBuffer(0));
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})
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.catch(reject);
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}
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return cache.get(uri);
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}
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async readJson(uri) {
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const key = ['$$json', uri].join(':');
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if (!cache.has(key)) {
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let promise, resolve, reject;
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promise = new Promise((res, rej) => {
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resolve = res;
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reject = rej;
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});
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cache.set(key, promise);
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this.readAsset(uri)
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.then((chars) => {
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resolve(chars.byteLength > 0 ? JSON.parse((new TextDecoder()).decode(chars)) : {});
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})
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.catch(reject);
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}
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return cache.get(key);
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}
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async readScript(uri, context = {}) {
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const code = await this.readAsset(uri);
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if (code.byteLength > 0) {
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return Script.fromCode((new TextDecoder()).decode(code), context);
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}
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}
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}
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