69 lines
1.6 KiB
JavaScript
69 lines
1.6 KiB
JavaScript
export default class Query {
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$$criteria = {with: [], without: []};
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$$ecs;
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$$map = new Map();
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constructor(parameters, ecs) {
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this.$$ecs = ecs;
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for (let i = 0; i < parameters.length; ++i) {
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const parameter = parameters[i];
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switch (parameter.charCodeAt(0)) {
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case '!'.charCodeAt(0):
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this.$$criteria.without.push(ecs.Components[parameter.slice(1)]);
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break;
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default:
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this.$$criteria.with.push(ecs.Components[parameter]);
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break;
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}
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}
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}
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get count() {
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return this.$$map.size;
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}
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deindex(entityIds) {
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for (const entityId of entityIds) {
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this.$$map.delete(entityId);
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}
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}
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reindex(entityIds) {
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if (0 === this.$$criteria.with.length && 0 === this.$$criteria.without.length) {
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for (const entityId of entityIds) {
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this.$$map.set(entityId, this.$$ecs.get(entityId));
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}
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return;
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}
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for (const entityId of entityIds) {
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let should = true;
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for (let j = 0; j < this.$$criteria.with.length; ++j) {
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if ('undefined' === typeof this.$$criteria.with[j].get(entityId)) {
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should = false;
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break;
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}
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}
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if (should) {
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for (let j = 0; j < this.$$criteria.without.length; ++j) {
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if ('undefined' !== typeof this.$$criteria.without[j].get(entityId)) {
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should = false;
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break;
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}
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}
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}
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if (should) {
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this.$$map.set(entityId, this.$$ecs.get(entityId));
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}
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else if (!should) {
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this.$$map.delete(entityId);
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}
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}
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}
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select() {
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return this.$$map.values();
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}
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}
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