141 lines
5.2 KiB
C#
141 lines
5.2 KiB
C#
// Animancer // https://kybernetik.com.au/animancer // Copyright 2018-2024 Kybernetik //
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#if UNITY_EDITOR
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using System;
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using System.Collections.Generic;
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using System.Reflection;
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using UnityEditor;
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using UnityEngine;
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namespace Animancer.Editor
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{
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/// <summary>[Editor-Only] A cache to optimize repeated attribute access.</summary>
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/// <remarks>
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/// If <typeparamref name="TAttribute"/> implements <see cref="IInitializable{T}"/> for <see cref="MemberInfo"/>,
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/// its <see cref="IInitializable{T}.Initialize(T)"/> method will be called automatically.
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/// </remarks>
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/// https://kybernetik.com.au/animancer/api/Animancer.Editor/AttributeCache_1
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public static class AttributeCache<TAttribute>
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where TAttribute : class
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{
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/************************************************************************************************************************/
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private static readonly Dictionary<MemberInfo, TAttribute>
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MemberToAttribute = new();
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/************************************************************************************************************************/
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/// <summary>
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/// Returns the <typeparamref name="TAttribute"/> attribute on the specified `member` (if there is one).
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/// </summary>
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public static TAttribute GetAttribute(MemberInfo member)
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{
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if (!MemberToAttribute.TryGetValue(member, out var attribute))
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{
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try
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{
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attribute = member.GetAttribute<TAttribute>();
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if (attribute is IInitializable<MemberInfo> initializable)
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initializable.Initialize(member);
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}
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catch (Exception exception)
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{
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Debug.LogException(exception);
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attribute = null;
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}
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MemberToAttribute.Add(member, attribute);
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}
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return attribute;
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}
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/************************************************************************************************************************/
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/// <summary>
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/// Returns the <typeparamref name="TAttribute"/> attribute (if any)
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/// on the specified `type` or its <see cref="Type.BaseType"/> (recursively).
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/// </summary>
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public static TAttribute GetAttribute(Type type)
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{
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if (type == null)
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return null;
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var attribute = GetAttribute((MemberInfo)type);
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if (attribute != null)
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return attribute;
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return MemberToAttribute[type] = GetAttribute(type.BaseType);
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}
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/************************************************************************************************************************/
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/// <summary>
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/// Returns the <typeparamref name="TAttribute"/> attribute on the specified `field` or its
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/// <see cref="FieldInfo.FieldType"/> or <see cref="MemberInfo.DeclaringType"/>.
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/// </summary>
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public static TAttribute FindAttribute(FieldInfo field)
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{
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var attribute = GetAttribute(field);
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if (attribute != null)
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return attribute;
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attribute = GetAttribute(field.FieldType);
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if (attribute != null)
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return MemberToAttribute[field] = attribute;
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attribute = GetAttribute(field.DeclaringType);
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if (attribute != null)
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return MemberToAttribute[field] = attribute;
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return attribute;
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}
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/************************************************************************************************************************/
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/// <summary>[Editor-Only]
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/// Returns the <typeparamref name="TAttribute"/> attribute on the underlying field
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/// of the `property` or its <see cref="FieldInfo.FieldType"/> or
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/// <see cref="MemberInfo.DeclaringType"/> or any of the parent properties
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/// or the type of the <see cref="SerializedObject.targetObject"/>.
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/// </summary>
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public static TAttribute FindAttribute(SerializedProperty property)
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{
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var accessor = property.GetAccessor();
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while (accessor != null)
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{
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var field = accessor.GetField(property);
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var attribute = GetAttribute(field);
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if (attribute != null)
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return attribute;
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var value = accessor.GetValue(property);
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if (value != null)
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{
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attribute = GetAttribute(value.GetType());
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if (attribute != null)
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return attribute;
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}
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accessor = accessor.Parent;
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}
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// If none of the fields of types they are declared in have names, try the actual type of the target.
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{
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var attribute = GetAttribute(property.serializedObject.targetObject.GetType());
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if (attribute != null)
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return attribute;
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}
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return null;
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}
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/************************************************************************************************************************/
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}
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}
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#endif
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