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//
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// RouteComposer
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// GeneralStep.swift
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// https://github.com/ekazaev/route-composer
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//
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// Created by Eugene Kazaev in 2018-2022.
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// Distributed under the MIT license.
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//
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// Become a sponsor:
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// https://github.com/sponsors/ekazaev
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//
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import Foundation
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import UIKit
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/// A wrapper for the general steps that can be applied to any `UIViewController`
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public enum GeneralStep {
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// MARK: Internal entities
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struct RootViewControllerStep: RoutingStep, PerformableStep {
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let windowProvider: WindowProvider
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/// Constructor
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init(windowProvider: WindowProvider = RouteComposerDefaults.shared.windowProvider) {
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self.windowProvider = windowProvider
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}
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func perform(with context: AnyContext) throws -> PerformableStepResult {
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guard let viewController = windowProvider.window?.rootViewController else {
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throw RoutingError.compositionFailed(.init("Root view controller was not found."))
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}
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return .success(viewController)
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}
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}
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struct CurrentViewControllerStep: RoutingStep, PerformableStep {
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let windowProvider: WindowProvider
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/// Constructor
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init(windowProvider: WindowProvider = RouteComposerDefaults.shared.windowProvider) {
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self.windowProvider = windowProvider
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}
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func perform(with context: AnyContext) throws -> PerformableStepResult {
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guard let viewController = windowProvider.window?.topmostViewController else {
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throw RoutingError.compositionFailed(.init("Topmost view controller was not found."))
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}
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return .success(viewController)
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}
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}
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struct FinderStep: RoutingStep, PerformableStep {
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let finder: AnyFinder?
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init(finder: some Finder) {
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self.finder = FinderBox(finder)
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}
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func perform(with context: AnyContext) throws -> PerformableStepResult {
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guard let viewController = try finder?.findViewController(with: context) else {
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throw RoutingError.compositionFailed(.init("A view controller of \(String(describing: finder)) was not found."))
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}
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return .success(viewController)
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}
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}
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// MARK: Steps
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/// Returns the root view controller of the key window.
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public static func root<C>(windowProvider: WindowProvider = RouteComposerDefaults.shared.windowProvider) -> DestinationStep<UIViewController, C> {
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DestinationStep(RootViewControllerStep(windowProvider: windowProvider))
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}
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/// Returns the topmost presented view controller.
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public static func current<C>(windowProvider: WindowProvider = RouteComposerDefaults.shared.windowProvider) -> DestinationStep<UIViewController, C> {
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DestinationStep(CurrentViewControllerStep(windowProvider: windowProvider))
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}
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/// Returns the resulting view controller of the finder provided.
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public static func custom<F: Finder>(using finder: F) -> DestinationStep<F.ViewController, F.Context> {
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DestinationStep(FinderStep(finder: finder))
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}
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}
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