WIP: documentation

Sources/EnvironmentValues+DataSources.swift

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+//
+//  EnvironmentValues+DataSources.swift
+//  CoreStore
+//
+//  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.
+//
+
+#if canImport(SwiftUI)
+
+import SwiftUI
+
+
+// MARK: - EnvironmentValues
+
+@available(iOS 13.0, tvOS 13.0, watchOS 6.0, macOS 10.15, *)
+extension EnvironmentValues {
+
+    // MARK: Public
+
+    /**
+     The `DataStack` instance injected to `self`:
+     ```
+     @Environment(\.dataStack)
+     var dataStack: DataStack
+     ```
+     */
+    public var dataStack: DataStack {
+        
+        get {
+            
+            return self[DataStackKey.self]
+        }
+        set {
+            
+            self[DataStackKey.self] = newValue
+        }
+    }
+
+
+    // MARK: - DataStackEnvironmentKey
+
+    @available(iOS 13.0, tvOS 13.0, watchOS 6.0, macOS 10.15, *)
+    fileprivate struct DataStackKey: EnvironmentKey {
+
+        // MARK: FilePrivate
+        
+        fileprivate static var defaultValue: DataStack {
+            
+            return Shared.defaultStack
+        }
+    }
+}
+
+#endif