Reflection provides an API for advanced reflection at runtime including dynamic construction of types.
import Reflection
struct Person {
var firstName: String
var lastName: String
var age: Int
}
// Reflects the instance properties of type `Person`
let props = try properties(Person.self)
var person = Person(firstName: "John", lastName: "Smith", age: 35)
// Retrieves the value of `person.firstName`
let firstName: String = try get("firstName", from: person)
// Sets the value of `person.age`
try set(36, key: "age", for: &person)
// Creates a `Person` from a dictionary
let friend: Person = try construct(dictionary: ["firstName" : "Sarah",
"lastName" : "Gates",
"age" : 28])
import PackageDescription
let package = Package(
dependencies: [
.Package(url: "https://github.com/Zewo/Reflection.git", majorVersion: 0, minor: 15),
]
)// `Reflection` can be extended for higher-level packages to do mapping and serializing.
// Here is a simple `Mappable` protocol that allows deserializing of arbitrary nested structures.
import Reflection
typealias MappableDictionary = [String : Any]
enum Error : ErrorProtocol {
case missingRequiredValue(key: String)
}
protocol Mappable {
init(dictionary: MappableDictionary) throws
}
extension Mappable {
init(dictionary: MappableDictionary) throws {
self = try construct { property in
if let value = dictionary[property.key] {
if let type = property.type as? Mappable.Type, let value = value as? MappableDictionary {
return try type.init(dictionary: value)
} else {
return value
}
} else {
throw Error.missingRequiredValue(key: property.key)
}
}
}
}
struct Person : Mappable {
var firstName: String
var lastName: String
var age: Int
var phoneNumber: PhoneNumber
}
struct PhoneNumber : Mappable {
var number: String
var type: String
}
let dictionary = [
"firstName" : "Jane",
"lastName" : "Miller",
"age" : 54,
"phoneNumber" : [
"number" : "924-555-0294",
"type" : "work"
] as MappableDictionary
] as MappableDictionary
let person = try Person(dictionary: dictionary)If you need any help you can join our Slack and go to the #help channel. Or you can create a Github issue in our main repository. When stating your issue be sure to add enough details, specify what module is causing the problem and reproduction steps.
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This project is released under the MIT license. See LICENSE for details.