CoreStore/Sources/Internals.swift

//
//  Internals.swift
//  CoreStore iOS
//
//  Copyright © 2018 John Rommel Estropia
//
//  Permission is hereby granted, free of charge, to any person obtaining a copy
//  of this software and associated documentation files (the "Software"), to deal
//  in the Software without restriction, including without limitation the rights
//  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
//  copies of the Software, and to permit persons to whom the Software is
//  furnished to do so, subject to the following conditions:
//
//  The above copyright notice and this permission notice shall be included in all
//  copies or substantial portions of the Software.
//
//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
//  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
//  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
//  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
//  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
//  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
//  SOFTWARE.
//

import Foundation

// MARK: - Internals

@usableFromInline
internal enum Internals {

    // MARK: Associated Objects

    @inline(__always)
    /// type(of:) doesn't return the dynamic type anymore, use this to guarantee correct dispatch of class methods
    internal static func dynamicObjectType<T: AnyObject>(of instance: T) -> T.Type {

        return object_getClass(instance) as! T.Type
    }

    @inline(__always)
    internal static func getAssociatedObjectForKey<T: AnyObject>(_ key: UnsafeRawPointer, inObject object: Any) -> T? {

        switch objc_getAssociatedObject(object, key) {

        case let associatedObject as T:
            return associatedObject

        case let associatedObject as Internals.WeakObject:
            return associatedObject.object as? T

        default:
            return nil
        }
    }

    @inline(__always)
    internal static func setAssociatedRetainedObject<T: AnyObject>(_ associatedObject: T?, forKey key: UnsafeRawPointer, inObject object: Any) {

        objc_setAssociatedObject(object, key, associatedObject, .OBJC_ASSOCIATION_RETAIN_NONATOMIC)
    }

    @inline(__always)
    internal static func setAssociatedCopiedObject<T: AnyObject>(_ associatedObject: T?, forKey key: UnsafeRawPointer, inObject object: Any) {

        objc_setAssociatedObject(object, key, associatedObject, .OBJC_ASSOCIATION_COPY_NONATOMIC)
    }

    @inline(__always)
    internal static func setAssociatedWeakObject<T: AnyObject>(_ associatedObject: T?, forKey key: UnsafeRawPointer, inObject object: Any) {

        if let associatedObject = associatedObject {

            objc_setAssociatedObject(object, key, Internals.WeakObject(associatedObject), .OBJC_ASSOCIATION_RETAIN_NONATOMIC)
        }
        else {

            objc_setAssociatedObject(object, key, nil, .OBJC_ASSOCIATION_RETAIN_NONATOMIC)
        }
    }


    // MARK: Printing Utilities

    @inline(__always)
    internal static func typeName<T>(_ value: T) -> String {

        return "'\(String(reflecting: type(of: value)))'"
    }

    @inline(__always)
    internal static func typeName<T>(_ value: T.Type) -> String {

        return "'\(value)'"
    }

    @inline(__always)
    internal static func typeName(_ value: AnyClass) -> String {

        return "'\(value)'"
    }

    @inline(__always)
    internal static func typeName(_ name: String) -> String {

        return "<\(name)>"
    }

    @inline(__always)
    internal static func typeName(_ name: String?) -> String {

        return "<\(name ?? "unknown")>"
    }


    // MARK: Functional

    @inline(__always)
    internal static func with<T>(_ closure: () -> T) -> T {

        return closure()
    }

    @inline(__always)
    internal static func autoreleasepool<T>(
        _ closure: () -> T
    ) -> T {

        return ObjectiveC.autoreleasepool(invoking: closure)
    }

    @inline(__always)
    internal static func autoreleasepool<T>(
        _ closure: () throws(any Swift.Error) -> T
    ) throws(any Swift.Error) -> T {

        return try ObjectiveC.autoreleasepool(invoking: closure)
    }

    @inline(__always)
    internal static func autoreleasepool<T>(
        _ closure: () throws(CoreStoreError) -> T
    ) throws(CoreStoreError) -> T {

        do {

            return try ObjectiveC.autoreleasepool(invoking: closure)
        }
        catch {

            throw CoreStoreError(error)
        }
    }

    @inline(__always)
    internal static func withCheckedThrowingContinuation<T>(
        function: String = #function,
        _ body: (CheckedContinuation<T, any Swift.Error>) -> Void
    ) async throws(any Swift.Error) -> T {

        return try await _Concurrency.withCheckedThrowingContinuation(
            function: function,
            body
        )
    }
}