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‎.gitignore

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.DS_Store
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/.build
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/Packages
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/*.xcodeproj
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xcuserdata/

‎.swiftpm/xcode/package.xcworkspace/contents.xcworkspacedata

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‎LICENSE

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MIT License
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Copyright (c) 2020 Maxim Krouk
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in all
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copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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SOFTWARE.

‎Package.swift

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// swift-tools-version:5.3
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import PackageDescription
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let package = Package(
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name: "swift-declarative-configuration",
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products: [
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.library(
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name: "DeclarativeConfiguration",
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targets: ["DeclarativeConfiguration"]
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),
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.library(
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name: "FunctionalBuilder",
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targets: ["FunctionalBuilder"]
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),
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.library(
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name: "FunctionalConfigurator",
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targets: ["FunctionalConfigurator"]
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),
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.library(
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name: "FunctionalKeyPath",
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targets: ["FunctionalKeyPath"]
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),
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.library(
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name: "FunctionalModification",
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targets: ["FunctionalModification"]
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),
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],
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dependencies: [
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.package(url: "https://github.com/pointfreeco/swift-case-paths.git", from: "0.1.2")
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],
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targets: [
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.target(
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name: "DeclarativeConfiguration",
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dependencies: [
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.target(name: "FunctionalBuilder"),
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.target(name: "FunctionalConfigurator"),
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.target(name: "FunctionalKeyPath"),
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.target(name: "FunctionalModification"),
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.product(name: "CasePaths", package: "swift-case-paths")
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]
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),
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.target(
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name: "FunctionalBuilder",
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dependencies: [
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.target(name: "FunctionalConfigurator"),
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.target(name: "FunctionalKeyPath"),
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.target(name: "FunctionalModification")
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]
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),
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.target(
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name: "FunctionalConfigurator",
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dependencies: [
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.target(name: "FunctionalKeyPath"),
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.target(name: "FunctionalModification")
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]
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),
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.target(name: "FunctionalKeyPath"),
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.target(name: "FunctionalModification"),
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.testTarget(
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name: "FunctionalConfigurationTests",
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dependencies: [
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.target(name: "FunctionalBuilder")
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]
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),
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]
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)

‎README.md

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# Swift Declarative Configuration
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[![Swift 5.3](https://img.shields.io/badge/swift-5.3-ED523F.svg?style=flat)](https://swift.org/download/) [![SwiftPM](https://img.shields.io/badge/SwiftPM-ED523F.svg?style=flat)](https://swift.org/package-manager/) [![@maximkrouk](https://img.shields.io/badge/contact-@maximkrouk-ED523F.svg?style=flat)](https://twitter.com/maximkrouk)
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Swift Declarative Configuration (SDC, for short) is a tiny library, that enables you to configure your objects in a declarative, consistent and understandable way, with ergonomics in mind. It can be used to configure any objects on any platform, including server-side-swift.
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## Products
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- **[FunctionalModification](./Sources/FunctionalModification)**
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Provides modification functions for copying and modifying immutable stuff. It is useful for self-configuring objects like builder, when modificating methods should return modified `self`
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- **[FunctionalKeyPath](./Sources/FunctionalKeyPath)** & **[CasePaths](https://github.com/pointfreeco/swift-case-paths)**
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KeyPath functional wrappers, one is generalized and the other is for enums. [CasePath is a dependency](https://github.com/pointfreeco/swift-case-paths).
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- **[FunctionalConfigurator](./Sources/FunctionalConfigurator)**
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Funtional configurator for anything, enables you to specify modification of an object and to apply the modification later.
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- **[FunctionalBuilder](./Sources/FunctionalBuilder)**
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Functional builder for anything, enables you to modify object instances in a declarative way. Also contains BuilderProvider protocol with a computed `builder` property and implements that protocol on NSObject type.
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- **[DeclarativeConfiguration](./Sources/DeclarativeConfiguration)**
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Wraps and exports all the products.
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## Basic Usage
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### UIKit & FunctionalConfigurator
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Maybe it worth to make another abstraction over configurator for UI setup, but for example I'll be using pure version.
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```swift
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import FunctionalConfigurator
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class ImageViewController: UIViewController {
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enum StyleSheet {
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static let imageView = Configurator<UIImageView>
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.contentMode(.scaleAspectFit)
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.backgroundColor(.black)
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.layer.masksToBounds(true)
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.layer.cornerRadius(10)
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}
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let imageView: UIImageView = .init()
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override func loadView() {
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self.view = imageView
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}
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override func viewDidLoad() {
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super.viewDidLoad()
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StyleSheet.imageView.configure(imageView)
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}
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}
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```
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### UIKit & FunctionalBuilder
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```swift
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import FunctionalBuilder
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class ImageViewController: UIViewController {
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let imageView = UIImageView().builder
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.contentMode(.scaleAspectFit)
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.backgroundColor(.black)
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.layer.masksToBounds(true)
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.layer.cornerRadius(10)
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.build()
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override func loadView() {
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self.view = imageView
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}
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}
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```
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### Modification
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```swift
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import FunctionalModification
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struct MyModel {
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var value1 = 0
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init() {}
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}
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let model_0 = MyModel()
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let model_1 = modification(of: model_0) { $0.value = 1 }
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import UIKit
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extension UIView {
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@discardableResult
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func cornerRadius(_ value: CGFloat) -> Self {
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modification(of: self) { view in
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view.layer.cornerRadius = value
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view.layer.masksToBounds = true
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}
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}
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}
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```
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## Installation
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### Basic
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You can add DeclarativeConfiguration to an Xcode project by adding it as a package dependency.
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1. From the **File** menu, select **Swift Packages › Add Package Dependency…**
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2. Enter "https://github.com/makeupstudio/swift-declarative-configuration" into the package repository URL text field
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3. Choose products you need to link them to your project.
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### Recommended
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If you use SwiftPM for your project, you can add DeclarativeConfiguration to your package file. Also my advice will be to use SSH.
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```swift
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.package(
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url: "git@github.com:makeupstudio/swift-declarative-configuration.git",
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from: "0.0.1"
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)
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```
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Do not forget about target dependencies:
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```swift
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.product(
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name: "DeclarativeConfiguration",
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package: "swift-declarative-configuration"
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)
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```
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## License
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This library is released under the MIT license. See [LICENSE](./LICENSE) for details.

‎Sources/DeclarativeConfiguration/Exports.swift

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@_exported import FunctionalBuilder
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@_exported import FunctionalConfigurator
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@_exported import FunctionalKeyPath
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@_exported import FunctionalModification
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@_exported import CasePaths

‎Sources/FunctionalBuilder/Builder.swift

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import FunctionalConfigurator
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import FunctionalKeyPath
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@dynamicMemberLookup
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public struct Builder<Base> {
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private var _initialValue: () -> Base
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private var _configurator: Configurator<Base>
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public func build() -> Base { _configurator.configure(_initialValue()) }
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@inlinable
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public func apply() where Base: AnyObject { _ = build() }
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@inlinable
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public func reinforce(_ transform: @escaping (inout Base) -> Void) -> Builder {
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Builder(build()).set(transform)
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}
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public init(_ initialValue: @escaping @autoclosure () -> Base) {
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self.init(
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initialValue,
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Configurator<Base>()
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)
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}
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private init(
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_ initialValue: @escaping () -> Base,
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_ configurator: Configurator<Base>
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) {
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_initialValue = initialValue
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_configurator = configurator
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}
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public func set(
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_ transform: @escaping (inout Base) -> Void
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) -> Builder {
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Builder(
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_initialValue,
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_configurator.set(transform)
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)
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}
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public subscript<Value>(
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dynamicMember keyPath: WritableKeyPath<Base, Value>
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) -> CallableBlock<Value> {
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.init(
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builder: self,
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keyPath: .init(keyPath)
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)
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}
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public subscript<Value>(
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dynamicMember keyPath: KeyPath<Base, Value>
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) -> NonCallableBlock<Value> where Base: AnyObject, Value: AnyObject {
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.init(
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builder: self,
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keyPath: .getonly(keyPath)
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)
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}
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}
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extension Builder {
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@dynamicMemberLookup
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public struct CallableBlock<Value> {
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private var _block: NonCallableBlock<Value>
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init(
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builder: Builder,
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keyPath: FunctionalKeyPath<Base, Value>
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) {
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self._block = .init(
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builder: builder,
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keyPath: keyPath
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)
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}
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public func callAsFunction(_ value: @escaping @autoclosure () -> Value) -> Builder {
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Builder(
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_block.builder._initialValue,
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_block.builder._configurator.appendingConfiguration { base in
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_block.keyPath.embed(value(), in: base)
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}
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)
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}
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public subscript<LocalValue>(
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dynamicMember keyPath: WritableKeyPath<Value, LocalValue>
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) -> CallableBlock<LocalValue> {
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.init(
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builder: _block.builder,
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keyPath: _block.keyPath.appending(path: .init(keyPath))
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)
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}
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public subscript<LocalValue>(
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dynamicMember keyPath: KeyPath<Value, LocalValue>
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) -> NonCallableBlock<LocalValue> where Value: AnyObject, LocalValue: AnyObject {
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_block[dynamicMember: keyPath]
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}
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}
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@dynamicMemberLookup
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public struct NonCallableBlock<Value> {
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var builder: Builder
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var keyPath: FunctionalKeyPath<Base, Value>
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public subscript<LocalValue>(
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dynamicMember keyPath: WritableKeyPath<Value, LocalValue>
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) -> CallableBlock<LocalValue> where Value: AnyObject {
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.init(
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builder: self.builder,
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keyPath: self.keyPath.appending(path: .init(keyPath))
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)
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}
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public subscript<LocalValue>(
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dynamicMember keyPath: KeyPath<Value, LocalValue>
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) -> NonCallableBlock<LocalValue> where Value: AnyObject, LocalValue: AnyObject {
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.init(
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builder: self.builder,
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keyPath: self.keyPath.appending(path: .getonly(keyPath))
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)
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}
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}
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}

‎Sources/FunctionalBuilder/BuilderProvider.swift

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import Foundation
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public protocol BuilderProvider {}
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extension BuilderProvider {
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public var builder: Builder<Self> { .init(self) }
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}
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extension NSObject: BuilderProvider {}

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