Import YamlDotNet.

Assets/YamlDotNet/Serialization/YamlAttributeOverrides.cs

@@ -0,0 +1,198 @@
+// 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 System.Collections.Generic;
+using System.Diagnostics.CodeAnalysis;
+using System.Linq;
+using HashCode = YamlDotNet.Core.HashCode;
+
+namespace YamlDotNet.Serialization
+{
+    /// <summary>
+    /// Define a collection of YamlAttribute Overrides for pre-defined object types.
+    /// </summary>
+    public sealed partial class YamlAttributeOverrides
+    {
+        private struct AttributeKey
+        {
+            public readonly Type AttributeType;
+            public readonly string PropertyName;
+
+            public AttributeKey(Type attributeType, string propertyName)
+            {
+                AttributeType = attributeType;
+                PropertyName = propertyName;
+            }
+
+            public override bool Equals(object? obj)
+            {
+                return obj is AttributeKey other
+                    && AttributeType.Equals(other.AttributeType)
+                    && PropertyName.Equals(other.PropertyName);
+            }
+
+            public override int GetHashCode()
+            {
+                return HashCode.CombineHashCodes(AttributeType.GetHashCode(), PropertyName.GetHashCode());
+            }
+        }
+
+        private sealed class AttributeMapping
+        {
+            public readonly Type RegisteredType;
+            public readonly Attribute Attribute;
+
+            public AttributeMapping(Type registeredType, Attribute attribute)
+            {
+                this.RegisteredType = registeredType;
+                Attribute = attribute;
+            }
+
+            public override bool Equals(object? obj)
+            {
+                return obj is AttributeMapping other
+                    && RegisteredType.Equals(other.RegisteredType)
+                    && Attribute.Equals(other.Attribute);
+            }
+
+            public override int GetHashCode()
+            {
+                return HashCode.CombineHashCodes(RegisteredType.GetHashCode(), Attribute.GetHashCode());
+            }
+
+            /// <summary>
+            /// Checks whether this mapping matches the specified type, and returns a value indicating the match priority.
+            /// </summary>
+            /// <returns>The priority of the match. Higher values have more priority. Zero indicates no match.</returns>
+            public int Matches(Type matchType)
+            {
+                var currentPriority = 0;
+                Type? currentType = matchType;
+                do
+                {
+                    ++currentPriority;
+                    if (currentType == RegisteredType)
+                    {
+                        return currentPriority;
+                    }
+                    currentType = currentType.BaseType();
+                } while (currentType != null);
+
+                if (matchType.GetInterfaces().Contains(RegisteredType))
+                {
+                    return currentPriority;
+                }
+
+                return 0;
+            }
+        }
+
+        private readonly Dictionary<AttributeKey, List<AttributeMapping>> overrides = new Dictionary<AttributeKey, List<AttributeMapping>>();
+
+        [return: MaybeNull]
+        public T GetAttribute<T>(Type type, string member) where T : Attribute
+        {
+            if (overrides.TryGetValue(new AttributeKey(typeof(T), member), out var mappings))
+            {
+                var bestMatchPriority = 0;
+                AttributeMapping? bestMatch = null;
+
+                foreach (var mapping in mappings)
+                {
+                    var priority = mapping.Matches(type);
+                    if (priority > bestMatchPriority)
+                    {
+                        bestMatchPriority = priority;
+                        bestMatch = mapping;
+                    }
+                }
+
+                if (bestMatchPriority > 0)
+                {
+                    return (T)bestMatch!.Attribute;
+                }
+            }
+
+            return default;
+        }
+
+        /// <summary>
+        /// Adds a Member Attribute Override
+        /// </summary>
+        /// <param name="type">Type</param>
+        /// <param name="member">Class Member</param>
+        /// <param name="attribute">Overriding Attribute</param>
+        public void Add(Type type, string member, Attribute attribute)
+        {
+            var mapping = new AttributeMapping(type, attribute);
+
+            var attributeKey = new AttributeKey(attribute.GetType(), member);
+            if (!overrides.TryGetValue(attributeKey, out var mappings))
+            {
+                mappings = new List<AttributeMapping>();
+                overrides.Add(attributeKey, mappings);
+            }
+            else if (mappings.Contains(mapping))
+            {
+                throw new InvalidOperationException($"Attribute ({attribute}) already set for Type {type.FullName}, Member {member}");
+            }
+
+            mappings.Add(mapping);
+        }
+
+        /// <summary>
+        /// Creates a copy of this instance.
+        /// </summary>
+        public YamlAttributeOverrides Clone()
+        {
+            var clone = new YamlAttributeOverrides();
+            foreach (var entry in overrides)
+            {
+                foreach (var item in entry.Value)
+                {
+                    clone.Add(item.RegisteredType, entry.Key.PropertyName, item.Attribute);
+                }
+            }
+            return clone;
+        }
+    }
+}
+
+#if !NET20
+namespace YamlDotNet.Serialization
+{
+    using System.Linq.Expressions;
+    using YamlDotNet.Helpers;
+
+    partial class YamlAttributeOverrides
+    {
+        /// <summary>
+        /// Adds a Member Attribute Override
+        /// </summary>
+        public void Add<TClass>(Expression<Func<TClass, object>> propertyAccessor, Attribute attribute)
+        {
+            var property = propertyAccessor.AsProperty();
+            Add(typeof(TClass), property.Name, attribute);
+        }
+    }
+}
+#endif