Import YamlDotNet.

Assets/YamlDotNet/Serialization/IObjectDescriptor.cs

@@ -0,0 +1,67 @@
+// This file is part of YamlDotNet - A .NET library for YAML.
+// Copyright (c) Antoine Aubry and contributors
+//
+// 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.
+
+using System;
+using YamlDotNet.Core;
+
+namespace YamlDotNet.Serialization
+{
+    /// <summary>
+    /// Represents an object along with its type.
+    /// </summary>
+    public interface IObjectDescriptor
+    {
+        /// <summary>
+        /// A reference to the object.
+        /// </summary>
+        object? Value { get; }
+
+        /// <summary>
+        /// The type that should be used when to interpret the <see cref="Value" />.
+        /// </summary>
+        Type Type { get; }
+
+        /// <summary>
+        /// The type of <see cref="Value" /> as determined by its container (e.g. a property).
+        /// </summary>
+        Type StaticType { get; }
+
+        /// <summary>
+        /// The style to be used for scalars.
+        /// </summary>
+        ScalarStyle ScalarStyle { get; }
+    }
+
+    public static class ObjectDescriptorExtensions
+    {
+        /// <summary>
+        /// Returns the Value property of the <paramref name="objectDescriptor"/> if it is not null.
+        /// This is useful in all places that the value must not be null.
+        /// </summary>
+        /// <param name="objectDescriptor">An object descriptor.</param>
+        /// <exception cref="InvalidOperationException">Thrown when the Value is null</exception>
+        /// <returns></returns>
+        public static object NonNullValue(this IObjectDescriptor objectDescriptor)
+        {
+            return objectDescriptor.Value ?? throw new InvalidOperationException($"Attempted to use a IObjectDescriptor of type '{objectDescriptor.Type.FullName}' whose Value is null at a point whete it is invalid to do so. This may indicate a bug in YamlDotNet.");
+        }
+    }
+}