114 lines
3.1 KiB
Swift
114 lines
3.1 KiB
Swift
// Copyright 2020-2021 Tokamak contributors
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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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// Created by Carson Katri on 7/17/20.
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//
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import OpenCombineShim
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/// The renderer must specify a default `_StorageProvider` before any `SceneStorage`
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/// values are accessed.
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public enum _DefaultSceneStorageProvider {
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public static var `default`: _StorageProvider!
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}
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@propertyWrapper
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public struct SceneStorage<Value>: DynamicProperty {
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let key: String
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let defaultValue: Value
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let store: (_StorageProvider, String, Value) -> ()
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let read: (_StorageProvider, String) -> Value?
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var objectWillChange: AnyPublisher<(), Never> {
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_DefaultSceneStorageProvider.default.publisher.eraseToAnyPublisher()
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}
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public var wrappedValue: Value {
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get {
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read(_DefaultSceneStorageProvider.default, key) ?? defaultValue
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}
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nonmutating set {
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store(_DefaultSceneStorageProvider.default, key, newValue)
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}
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}
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public var projectedValue: Binding<Value> {
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.init {
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wrappedValue
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} set: {
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wrappedValue = $0
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}
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}
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}
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extension SceneStorage: ObservedProperty {}
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public extension SceneStorage {
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init(wrappedValue: Value, _ key: String) where Value == Bool {
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defaultValue = wrappedValue
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self.key = key
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store = { $0.store(key: $1, value: $2) }
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read = { $0.read(key: $1) }
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}
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init(wrappedValue: Value, _ key: String) where Value == Int {
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defaultValue = wrappedValue
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self.key = key
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store = { $0.store(key: $1, value: $2) }
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read = { $0.read(key: $1) }
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}
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init(wrappedValue: Value, _ key: String) where Value == Double {
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defaultValue = wrappedValue
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self.key = key
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store = { $0.store(key: $1, value: $2) }
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read = { $0.read(key: $1) }
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}
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init(wrappedValue: Value, _ key: String) where Value == String {
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defaultValue = wrappedValue
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self.key = key
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store = { $0.store(key: $1, value: $2) }
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read = { $0.read(key: $1) }
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}
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init(wrappedValue: Value, _ key: String) where Value: RawRepresentable,
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Value.RawValue == Int
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{
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defaultValue = wrappedValue
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self.key = key
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store = { $0.store(key: $1, value: $2.rawValue) }
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read = {
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guard let rawValue = $0.read(key: $1) as Int? else {
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return nil
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}
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return Value(rawValue: rawValue)
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}
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}
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init(wrappedValue: Value, _ key: String)
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where Value: RawRepresentable, Value.RawValue == String
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{
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defaultValue = wrappedValue
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self.key = key
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store = { $0.store(key: $1, value: $2.rawValue) }
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read = {
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guard let rawValue = $0.read(key: $1) as String? else {
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return nil
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}
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return Value(rawValue: rawValue)
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}
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}
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}
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