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