テンプレートはこんな感じ

% import Foundation % import Yams % guard let yaml = try Yams.compose(yaml: String(contentsOf: URL(fileURLWithPath: "TestResources/vector/vector.yml"))) else { fatalError() } % let vars = yaml.array().flatMap { $0.string } % for n in 2...4 { struct Vector${n} { % for i in 0..<n { var ${vars[i]}: Float % } } % }