ios中Deep Linking实例分析用法

public enum Navigation {
 case checkout(Int, Navigation.Checkout)
 case messages(messageThreadId: Int)
 case tab(Tab)
 ...
}

private let allRoutes: [String: (RouteParams) -> Decode<Navigation>] = [
 "/mpss/:a/:b/:c/:d/:e/:f/:g": emailLink,
 "/checkouts/:checkout_param/payments": paymentsRoot,
 "/discover/categories/:category_id": discovery,
 "/projects/:creator_param/:project_param/comments": projectComments,
  ...
]

public static func match(_ url: URL) -> Navigation? {
  return allRoutes.reduce(nil) { accum, templateAndRoute in
   let (template, route) = templateAndRoute
   return accum ?? parsedParams(url: url, fromTemplate: template).flatMap(route)?.value
  }
 }

private func parsedParams(url: URL, fromTemplate template: String) -> RouteParams? {
 ...
 let templateComponents = template
  .components(separatedBy: "/")
  .filter { $0 != "" }
 let urlComponents = url
  .path
  .components(separatedBy: "/")
  .filter { $0 != "" && !$0.hasPrefix("?") }
 guard templateComponents.count == urlComponents.count else { return nil }

 var params: [String: String] = [:]
 for (templateComponent, urlComponent) in zip(templateComponents, urlComponents) {
  if templateComponent.hasPrefix(":") {
   // matched a token
   let paramName = String(templateComponent.characters.dropFirst())
   params[paramName] = urlComponent
  } else if templateComponent != urlComponent {
   return nil
  }
 }
 URLComponents(url: url, resolvingAgainstBaseURL: false)?
  .queryItems?
  .forEach { item in
   params[item.name] = item.value
 }
 var object: [String: RouteParams] = [:]
 params.forEach { key, value in
  object[key] = .string(value)
 }
 return .object(object)
}