Properties.swift
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/*
* Copyright 1999-2101 Alibaba Group.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
//
// Created by zhouzhuo on 07/01/2017.
//
/// An instance property
struct Property {
let key: String
let value: Any
/// An instance property description
struct Description {
public let key: String
public let type: Any.Type
public let offset: Int
public func write(_ value: Any, to storage: UnsafeMutableRawPointer) {
return extensions(of: type).write(value, to: storage.advanced(by: offset))
}
}
}
/// Retrieve properties for `instance`
func getProperties(forInstance instance: Any) -> [Property]? {
if let props = getProperties(forType: type(of: instance)) {
var copy = extensions(of: instance)
let storage = copy.storage()
return props.map {
nextProperty(description: $0, storage: storage)
}
}
return nil
}
private func nextProperty(description: Property.Description, storage: UnsafeRawPointer) -> Property {
return Property(
key: description.key,
value: extensions(of: description.type).value(from: storage.advanced(by: description.offset))
)
}
/// Retrieve property descriptions for `type`
func getProperties(forType type: Any.Type) -> [Property.Description]? {
if let structDescriptor = Metadata.Struct(anyType: type) {
return structDescriptor.propertyDescriptions()
} else if let classDescriptor = Metadata.Class(anyType: type) {
return classDescriptor.propertyDescriptions()
} else if let objcClassDescriptor = Metadata.ObjcClassWrapper(anyType: type),
let targetType = objcClassDescriptor.targetType {
return getProperties(forType: targetType)
}
return nil
}