28 lines
1.0 KiB
JavaScript
28 lines
1.0 KiB
JavaScript
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export class Query {
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constructor(include, exclude) {
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this.include = include;
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this.exclude = exclude;
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this.isDirty = true;
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this.results = new Array();
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this.includeComponentIds = include.map((component) => component.id);
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this.excludeComponentIds = exclude.map((component) => component.id);
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}
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execute(world) {
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if (!this.isDirty && this.results) {
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return this.results;
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}
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let filtered;
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const entities = world.entities.filter(entity => {
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let ids = entity.components.map(component => component.id);
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let includes = ids.map(id => this.includeComponentIds.includes(id)).includes(true);
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let excludes = ids.map(id => this.excludeComponentIds.includes(id)).includes(true);
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return includes && !excludes;
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});
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if (entities.length > 0) {
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this.isDirty = false;
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this.results = entities;
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}
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return entities;
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}
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}
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