62 lines
1.6 KiB
JavaScript
62 lines
1.6 KiB
JavaScript
class Node {
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children = {};
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class;
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}
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export default class EntityFactory {
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$$tries = new Node();
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makeClass(componentNames, Components) {
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const sorted = componentNames.toSorted();
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let walk = this.$$tries;
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let i = 0;
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while (i < sorted.length) {
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if (!walk.children[sorted[i]]) {
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walk.children[sorted[i]] = new Node();
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}
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walk = walk.children[sorted[i]];
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i += 1;
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}
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if (!walk.class) {
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class Entity {
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static componentNames = sorted;
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constructor(id) {
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this.id = id;
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}
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size() {
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let size = 0;
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for (const componentName of this.constructor.componentNames) {
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const instance = Components[componentName];
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size += 2 + 4 + instance.constructor.schema.sizeOf(instance.get(this.id));
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}
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// ID + # of components.
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return size + 4 + 2;
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}
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}
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const properties = {};
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for (const type of sorted) {
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properties[type] = {};
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const get = Components[type].get.bind(Components[type]);
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properties[type].get = function() {
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return get(this.id);
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};
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}
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Object.defineProperties(Entity.prototype, properties);
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Entity.prototype.toJSON = new Function('', `
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return {
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${sorted.map((type) => `${type}: this.${type}.toJSON()`).join(', ')}
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};
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`);
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Entity.prototype.toNet = new Function('', `
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return {
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${sorted.map((type) => `${type}: this.${type}.toNet()`).join(', ')}
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};
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`);
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walk.class = Entity;
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}
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return walk.class;
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}
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}
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