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