23978952007

Committed 04 Apr 2026 12:31PM UTC coverage: 95.801% (-1.5%) from 97.293%

Build # 23978952007

Build Type

push

github

Committed by

dennisdoomen

Commit Message

Improve the performance of getting fields and properties

Optimize property and field caching, replace `HasFlag` with bitwise operations, and improve `ToArray` and `Enumerator` implementations.

Coverage Stats

211 of 224 branches covered (94.2%)

Branch coverage included in aggregate %.

58 of 63 new or added lines in 1 file covered. (92.06%)

2 existing lines in 1 file now uncovered.

405 of 419 relevant lines covered (96.66%)

5250619.99 hits per line

Source File
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95.8

/src/Reflectify/Reflectify.cs

﻿#if !REFLECTIFY_COMPILE
// <autogenerated />
#pragma warning disable
#endif

#nullable disable

using System;
using System.Collections;
using System.Collections.Concurrent;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;
using System.Runtime.CompilerServices;
using System.Text;

namespace Reflectify;

internal static class TypeMetaDataExtensions
{
    /// <summary>
    /// Returns the name of the type without the generic backtick and the type arguments.
    /// </summary>
    public static string GetNonGenericName(this Type type)
    {
        string name = type.Name;
        int index = name.IndexOf('`');
        return index == -1 ? name : name.Substring(0, index);
    }

    /// <summary>
    /// Returns <see langword="true" /> if the type is derived from an open-generic type, or <see langword="false" /> otherwise.
    /// </summary>
    public static bool IsDerivedFromOpenGeneric(this Type type, Type openGenericType)
    {
        // do not consider a type to be derived from itself
        if (type == openGenericType)
        {
            return false;
        }

        // check subject and its base types against definition
        for (Type baseType = type;
             baseType is not null;
             baseType = baseType.BaseType)
        {
            if (baseType.IsGenericType && baseType.GetGenericTypeDefinition() == openGenericType)
            {
                return true;
            }
        }

        return false;
    }

    /// <summary>
    /// Returns the interfaces that the <paramref name="type"/> implements or inherits from that are concrete
    /// versions of the <paramref name="openGenericType"/>.
    /// </summary>
    public static Type[] GetClosedGenericInterfaces(this Type type, Type openGenericType)
    {
        if (type.IsGenericType && type.GetGenericTypeDefinition() == openGenericType)
        {
            return [type];
        }

        Type[] interfaces = type.GetInterfaces();

        return interfaces
            .Where(t => t.GetInterfaces().Any(x => x.IsGenericType && x.GetGenericTypeDefinition() == openGenericType))
            .ToArray();
    }

    /// <summary>
    /// Returns <see langword="true" /> if the type is decorated with the specific <typeparamref name="TAttribute"/>,
    /// or <see langword="false" /> otherwise.
    /// </summary>
    public static bool HasAttribute<TAttribute>(this Type type)
        where TAttribute : Attribute
    {
        return type.IsDefined(typeof(TAttribute), inherit: false);
    }

    /// <summary>
    /// Returns <see langword="true" /> if the type is decorated with the specific <typeparamref name="TAttribute"/> <i>and</i>
    /// that attribute instance matches the predicate, or <see langword="false" /> otherwise.
    /// </summary>
    public static bool HasAttribute<TAttribute>(this Type type, Func<TAttribute, bool> predicate)
        where TAttribute : Attribute
    {
        if (predicate is null)
        {
            throw new ArgumentNullException(nameof(predicate));
        }

        return type.GetCustomAttributes<TAttribute>(inherit: false).Any(predicate);
    }

    /// <summary>
    /// Returns <see langword="true" /> if the type or one its parents are decorated with the
    /// specific <typeparamref name="TAttribute"/>.
    /// </summary>
    public static bool HasAttributeInHierarchy<TAttribute>(this Type type)
        where TAttribute : Attribute
    {
        return type.IsDefined(typeof(TAttribute), inherit: true);
    }

    /// <summary>
    /// Returns <see langword="true" /> if the type or one its parents are decorated with the
    /// specific <typeparamref name="TAttribute"/> <i>and</i> that attribute instance
    /// matches the predicate. Returns <see langword="false" /> otherwise.
    /// </summary>
    public static bool HasAttributeInHierarchy<TAttribute>(this Type type, Func<TAttribute, bool> predicate)
        where TAttribute : Attribute
    {
        if (predicate is null)
        {
            throw new ArgumentNullException(nameof(predicate));
        }

        return type.GetCustomAttributes<TAttribute>(inherit: true).Any(predicate);
    }

    /// <summary>
    /// Retrieves all custom attributes of the specified type from a class or its inheritance hierarchy.
    /// </summary>
    public static TAttribute[] GetMatchingAttributes<TAttribute>(this Type type)
        where TAttribute : Attribute
    {
        return (TAttribute[])type.GetCustomAttributes<TAttribute>(inherit: true);
    }

    /// <summary>
    /// Retrieves an array of attributes of a specified type that match the provided predicate.
    /// </summary>
    public static TAttribute[] GetMatchingAttributes<TAttribute>(this Type type, Func<TAttribute, bool> predicate)
        where TAttribute : Attribute
    {
        if (predicate is null)
        {
            throw new ArgumentNullException(nameof(predicate));
        }

        return type.GetCustomAttributes<TAttribute>(inherit: true).Where(predicate).ToArray();
    }

    /// <summary>
    /// Returns <see langword="true" /> if the type overrides the Equals method, or <see langword="false" /> otherwise.
    /// </summary>
    public static bool OverridesEquals(this Type type)
    {
        MethodInfo method = type
            .GetMethod("Equals", [typeof(object)]);

        return method is not null
               && method.GetBaseDefinition().DeclaringType != method.DeclaringType;
    }

    /// <summary>
    /// Determines whether the actual type is the same as, or inherits from, the expected type.
    /// </summary>
    /// <remarks>
    /// The expected type can also be an open generic type definition.
    /// </remarks>
    /// <returns><see langword="true" /> if the actual type is the same as, or inherits from, the expected type; otherwise, <see langword="false" />.</returns>
    public static bool IsSameOrInherits<TExpectedType>(this Type actualType)
    {
        return actualType.IsSameOrInherits(typeof(TExpectedType));
    }

    /// <summary>
    /// Determines whether the actual type is the same as, or inherits from, the expected type.
    /// </summary>
    /// <remarks>
    /// The expected type can also be an open generic type definition.
    /// </remarks>
    /// <returns><see langword="true" /> if the actual type is the same as, or inherits from, the expected type; otherwise, <see langword="false" />.</returns>
    public static bool IsSameOrInherits(this Type actualType, Type expectedType)
    {
        return actualType == expectedType ||
               expectedType.IsAssignableFrom(actualType) ||
               (actualType.BaseType is { IsGenericType: true } && actualType.BaseType.GetGenericTypeDefinition() == expectedType);
    }

    /// <summary>
    /// Returns <see langword="true" /> if the type is a delegate type; otherwise, <see langword="false" />.
    /// </summary>
    public static bool IsDelegate(this Type type)
    {
        return typeof(Delegate).IsAssignableFrom(type);
    }

    /// <summary>
    /// Returns <see langword="true" /> if the type is a compiler-generated type, or <see langword="false" /> otherwise.
    /// </summary>
    /// <remarks>
    /// Typical examples of compiler-generated types are anonymous types, tuples, and records.
    /// </remarks>
    public static bool IsCompilerGenerated(this Type type)
    {
        return type.HasAttribute<CompilerGeneratedAttribute>() ||
               type.IsRecord() ||
               type.IsTuple();
    }

    /// <summary>
    /// Returns <see langword="true" /> if the type has a readable name, or <see langword="false" />
    /// if it is a compiler-generated name.
    /// </summary>
    public static bool HasFriendlyName(this Type type)
    {
        return !type.IsAnonymous() && !type.IsTuple();
    }

    /// <summary>
    /// Return <see langword="true" /> if the type is a tuple type; otherwise, <see langword="false" />
    /// </summary>
    public static bool IsTuple(this Type type)
    {
        if (!type.IsGenericType)
        {
            return false;
        }

#if NETCOREAPP2_0_OR_GREATER || NET471_OR_GREATER || NETSTANDARD2_1_OR_GREATER
        return typeof(ITuple).IsAssignableFrom(type);
#else
        Type openType = type.GetGenericTypeDefinition();

        return openType == typeof(ValueTuple<>)
               || openType == typeof(ValueTuple<,>)
               || openType == typeof(ValueTuple<,,>)
               || openType == typeof(ValueTuple<,,,>)
               || openType == typeof(ValueTuple<,,,,>)
               || openType == typeof(ValueTuple<,,,,,>)
               || openType == typeof(ValueTuple<,,,,,,>)
               || (openType == typeof(ValueTuple<,,,,,,,>) && IsTuple(type.GetGenericArguments()[7]))
               || openType == typeof(Tuple<>)
               || openType == typeof(Tuple<,>)
               || openType == typeof(Tuple<,,>)
               || openType == typeof(Tuple<,,,>)
               || openType == typeof(Tuple<,,,,>)
               || openType == typeof(Tuple<,,,,,>)
               || openType == typeof(Tuple<,,,,,,>)
               || (openType == typeof(Tuple<,,,,,,,>) && IsTuple(type.GetGenericArguments()[7]));
#endif
    }

    /// <summary>
    /// Returns <see langword="true" /> if the type is an anonymous type, or <see langword="false" /> otherwise.
    /// </summary>
    public static bool IsAnonymous(this Type type)
    {
        if (!type.FullName!.Contains("AnonymousType"))
        {
            return false;
        }

        return type.HasAttribute<CompilerGeneratedAttribute>();
    }

    /// <summary>
    /// Return <see langword="true" /> if the type is a struct or class record type; otherwise, <see langword="false" />.
    /// </summary>
    public static bool IsRecord(this Type type)
    {
        return type.IsRecordClass() || type.IsRecordStruct();
    }

    /// <summary>
    /// Returns <see langword="true" /> if the type is a class record type; otherwise, <see langword="false" />.
    /// </summary>
    public static bool IsRecordClass(this Type type)
    {
        return type.GetMethod("<Clone>$", BindingFlags.Public | BindingFlags.Instance | BindingFlags.DeclaredOnly) is { } &&
               type.GetProperty("EqualityContract", BindingFlags.NonPublic | BindingFlags.Instance | BindingFlags.DeclaredOnly)?
                   .GetMethod?.HasAttribute<CompilerGeneratedAttribute>() == true;
    }

    /// <summary>
    /// Return <see langword="true" /> if the type is a record struct; otherwise, <see langword="false" />
    /// </summary>
    public static bool IsRecordStruct(this Type type)
    {
        // As noted here: https://learn.microsoft.com/en-us/dotnet/csharp/language-reference/proposals/csharp-10.0/record-structs#open-questions
        // recognizing record structs from metadata is an open point. The following check is based on common sense
        // and heuristic testing, apparently giving good results but not supported by official documentation.
        return type.BaseType == typeof(ValueType) &&
               type.GetMethod("PrintMembers", BindingFlags.NonPublic | BindingFlags.Instance | BindingFlags.DeclaredOnly, null,
                   [typeof(StringBuilder)], null) is { } &&
               type.GetMethod("op_Equality", BindingFlags.Static | BindingFlags.Public | BindingFlags.DeclaredOnly, null,
                       [type, type], null)?
                   .HasAttribute<CompilerGeneratedAttribute>() == true;
    }

    /// <summary>
    /// Determines whether the specified type is a KeyValuePair.
    /// </summary>
    /// <param name="type">The type to check.</param>
    /// <returns><see langword="true" /> if the type is a KeyValuePair; otherwise, <see langword="false" />.</returns>
    public static bool IsKeyValuePair(this Type type)
    {
        return type.IsGenericType && type.GetGenericTypeDefinition() == typeof(KeyValuePair<,>);
    }

    /// <summary>
    /// Returns <see langword="true" /> if the type is a struct (i.e., a value type that is not an enum);
    /// otherwise, <see langword="false" />.
    /// </summary>
    public static bool IsStruct(this Type type)
    {
        return type.IsValueType && !type.IsEnum;
    }

    /// <summary>
    /// Returns <see langword="true" /> if the type is a ref struct; otherwise, <see langword="false" />.
    /// </summary>
    /// <remarks>
    /// Returns <see langword="false" /> on .NET versions that do not support ref structs.
    /// </remarks>
    public static bool IsRefStruct(this Type type)
    {
#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER
        return type.IsDefined(typeof(IsByRefLikeAttribute), false);
#else
        return false;
#endif
    }
}

internal static class TypeMemberExtensions
{
    private static readonly ConcurrentDictionary<(Type Type, MemberKind Kind), Reflector> ReflectorCache = new();

    /// <summary>
    /// Gets the public, internal, explicitly implemented and/or default properties of a type hierarchy.
    /// </summary>
    /// <param name="type">The type to reflect.</param>
    /// <param name="kind">The kind of properties to include in the response.</param>
    public static PropertyInfo[] GetProperties(this Type type, MemberKind kind)
    {
        return GetFor(type, kind).Properties;
    }

    /// <summary>
    /// Finds the property by a case-sensitive name and with a certain visibility.
    /// </summary>
    /// <remarks>
    /// Normal property get priority over explicitly implemented properties and default interface properties.
    /// </remarks>
    /// <returns>
    /// Returns <see langword="null" /> if no such property exists.
    /// </returns>
    public static PropertyInfo FindProperty(this Type type, string propertyName, MemberKind memberVisibility)
    {
        if (propertyName is null or "")
        {
            throw new ArgumentException("The property name cannot be null or empty", nameof(propertyName));
        }

        var properties = type.GetProperties(memberVisibility);

        return Array.Find(properties, p =>
            p.Name == propertyName || p.Name.EndsWith("." + propertyName, StringComparison.Ordinal));
    }

    /// <summary>
    /// Gets the public and/or internal fields of a type hierarchy.
    /// </summary>
    /// <param name="type">The type to reflect.</param>
    /// <param name="kind">The kind of fields to include in the response.</param>
    public static FieldInfo[] GetFields(this Type type, MemberKind kind)
    {
        return GetFor(type, kind).Fields;
    }

    /// <summary>
    /// Finds the field by a case-sensitive name.
    /// </summary>
    /// <returns>
    /// Returns <see langword="null" /> if no such field exists.
    /// </returns>
    public static FieldInfo FindField(this Type type, string fieldName, MemberKind memberVisibility)
    {
        if (fieldName is null or "")
        {
            throw new ArgumentException("The field name cannot be null or empty", nameof(fieldName));
        }

        var fields = type.GetFields(memberVisibility);

        return Array.Find(fields, p => p.Name == fieldName);
    }

    /// <summary>
    /// Gets a combination of <see cref="GetProperties"/> and <see cref="GetFields"/>.
    /// </summary>
    /// <param name="type">The type to reflect.</param>
    /// <param name="kind">The kind of fields and properties to include in the response.</param>
    public static MemberInfo[] GetMembers(this Type type, MemberKind kind)
    {
        return GetFor(type, kind).Members;
    }

    private static Reflector GetFor(Type typeToReflect, MemberKind kind)
    {
        return ReflectorCache.GetOrAdd((typeToReflect, kind),
            static key => new Reflector(key.Type, key.Kind));
    }

    /// <summary>
    /// Finds a method by its name, parameter types and visibility. Returns <see langword="null" /> if no such method exists.
    /// </summary>
    /// <remarks>
    /// If you don't specify any parameter types, the method will be found by its name only.
    /// </remarks>
#pragma warning disable AV1561
    public static MethodInfo FindMethod(this Type type, string methodName, MemberKind kind, params Type[] parameterTypes)
#pragma warning restore AV1561
    {
        if (methodName is null or "")
        {
            throw new ArgumentException("The method name cannot be null or empty", nameof(methodName));
        }

        var flags = kind.ToBindingFlags() | BindingFlags.Instance | BindingFlags.Static;

        return type
            .GetMethods(flags)
            .SingleOrDefault(m => m.Name == methodName && HasSameParameters(parameterTypes, m));
    }

    /// <summary>
    /// Finds a parameterless method by its name and visibility. Returns <see langword="null" /> if no such method exists.
    /// </summary>
    public static MethodInfo FindParameterlessMethod(this Type type, string methodName, MemberKind memberKind)
    {
        return type.FindMethod(methodName, memberKind);
    }

    private static bool HasSameParameters(Type[] parameterTypes, MethodInfo method)
    {
        if (parameterTypes.Length == 0)
        {
            // If we don't specify any specific parameters, it matches always.
            return true;
        }

        return method.GetParameters()
            .Select(p => p.ParameterType)
            .SequenceEqual(parameterTypes);
    }

    /// <summary>
    /// Determines whether the type has a method with the specified name and visibility.
    /// </summary>
#pragma warning disable AV1561
    public static bool HasMethod(this Type type, string methodName, MemberKind memberKind, params Type[] parameterTypes)
#pragma warning restore AV1561
    {
        return type.FindMethod(methodName, memberKind, parameterTypes) is not null;
    }

    public static PropertyInfo FindIndexer(this Type type, MemberKind memberKind, params Type[] parameterTypes)
    {
        var flags = memberKind.ToBindingFlags() | BindingFlags.Instance | BindingFlags.Static;

        return type.GetProperties(flags)
            .SingleOrDefault(p =>
                p.IsIndexer() && p.GetIndexParameters().Select(i => i.ParameterType).SequenceEqual(parameterTypes));
    }

#pragma warning disable AV1561

    /// <summary>
    /// Finds an explicit conversion operator from the <paramref name="sourceType"/> to the <paramref name="targetType"/>.
    /// Returns <see langword="null" /> if no such operator exists.
    /// </summary>
    public static MethodInfo FindExplicitConversionOperator(this Type type, Type sourceType, Type targetType)
    {
        return type
            .GetConversionOperators(sourceType, targetType, name => name is "op_Explicit")
            .SingleOrDefault();
    }

    /// <summary>
    /// Finds an implicit conversion operator from the <paramref name="sourceType"/> to the <paramref name="targetType"/>.
    /// Returns <see langword="null" /> if no such operator exists.
    /// </summary>
    public static MethodInfo FindImplicitConversionOperator(this Type type, Type sourceType, Type targetType)
    {
        return type
            .GetConversionOperators(sourceType, targetType, name => name is "op_Implicit")
            .SingleOrDefault();
    }

    private static IEnumerable<MethodInfo> GetConversionOperators(this Type type, Type sourceType, Type targetType,
#pragma warning restore AV1561
        Func<string, bool> predicate)
    {
        return type
            .GetMethods(BindingFlags.Static | BindingFlags.Public)
            .Where(m =>
                m.IsPublic
                && m.IsStatic
                && m.IsSpecialName
                && m.ReturnType == targetType
                && predicate(m.Name)
                && m.GetParameters() is { Length: 1 } parameters
                && parameters[0].ParameterType == sourceType);
    }
}

internal static class TypeExtensions
{
    /// <summary>
    /// If the type provided is a nullable type, gets the underlying type. Returns the type itself otherwise.
    /// </summary>
    public static Type NullableOrActualType(this Type type)
    {
        if (type.IsConstructedGenericType && type.GetGenericTypeDefinition() == typeof(Nullable<>))
        {
            type = type.GetGenericArguments()[0];
        }

        return type;
    }
}

internal static class MemberInfoExtensions
{
    public static bool HasAttribute<TAttribute>(this MemberInfo member)
        where TAttribute : Attribute
    {
        // Do not use MemberInfo.IsDefined
        // There is an issue with PropertyInfo and EventInfo preventing the inherit option to work.
        // https://github.com/dotnet/runtime/issues/30219
        return Attribute.IsDefined(member, typeof(TAttribute), inherit: false);
    }

    /// <summary>
    /// Determines whether the member has an attribute of the specified type that matches the predicate.
    /// </summary>
    public static bool HasAttribute<TAttribute>(this MemberInfo member, Func<TAttribute, bool> predicate)
        where TAttribute : Attribute
    {
        if (predicate is null)
        {
            throw new ArgumentNullException(nameof(predicate));
        }

        return member.GetCustomAttributes<TAttribute>().Any(a => predicate(a));
    }

    public static bool HasAttributeInHierarchy<TAttribute>(this MemberInfo member)
        where TAttribute : Attribute
    {
        // Do not use MemberInfo.IsDefined
        // There is an issue with PropertyInfo and EventInfo preventing the inherit option to work.
        // https://github.com/dotnet/runtime/issues/30219
        return Attribute.IsDefined(member, typeof(TAttribute), inherit: true);
    }
}

internal static class ParameterInfoExtensions
{
    /// <summary>
    /// Returns <see langword="true" /> if the parameter is decorated with the specific <typeparamref name="TAttribute"/>,
    /// or <see langword="false" /> otherwise.
    /// </summary>
    public static bool HasAttribute<TAttribute>(this ParameterInfo parameter)
        where TAttribute : Attribute
    {
        return parameter.IsDefined(typeof(TAttribute), inherit: false);
    }

    /// <summary>
    /// Returns <see langword="true" /> if the parameter is decorated with the specific <typeparamref name="TAttribute"/> <i>and</i>
    /// that attribute instance matches the predicate, or <see langword="false" /> otherwise.
    /// </summary>
    public static bool HasAttribute<TAttribute>(this ParameterInfo parameter, Func<TAttribute, bool> predicate)
        where TAttribute : Attribute
    {
        if (predicate is null)
        {
            throw new ArgumentNullException(nameof(predicate));
        }

        return parameter.GetCustomAttributes<TAttribute>(inherit: false).Any(predicate);
    }

    /// <summary>
    /// Returns <see langword="true" /> if the parameter or one of its overridden definitions are decorated with the
    /// specific <typeparamref name="TAttribute"/>.
    /// </summary>
    public static bool HasAttributeInHierarchy<TAttribute>(this ParameterInfo parameter)
        where TAttribute : Attribute
    {
        return parameter.IsDefined(typeof(TAttribute), inherit: true);
    }
}

internal static class PropertyInfoExtensions
{
    /// <summary>
    /// Returns <see langword="true" /> if the property is an indexer, or <see langword="false" /> otherwise.
    /// </summary>
    public static bool IsIndexer(this PropertyInfo member)
    {
        return member.GetIndexParameters().Length != 0;
    }

    /// <summary>
    /// Returns <see langword="true" /> if the property is explicitly implemented on the
    /// <see cref="MemberInfo.DeclaringType"/>, or <see langword="false" /> otherwise.
    /// </summary>
    public static bool IsExplicitlyImplemented(this PropertyInfo prop)
    {
#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER
        return prop.Name.Contains('.');
#else
        return prop.Name.IndexOf('.') != -1;
#endif
    }

    /// <summary>
    /// Returns <see langword="true" /> if the property has a public getter or setter, or <see langword="false" /> otherwise.
    /// </summary>
    public static bool IsPublic(this PropertyInfo prop)
    {
        return prop.GetMethod is { IsPublic: true } || prop.SetMethod is { IsPublic: true };
    }

    /// <summary>
    /// Returns <see langword="true" /> if the property is internal, or <see langword="false" /> otherwise.
    /// </summary>
    /// <param name="prop">The property to check.</param>
    public static bool IsInternal(this PropertyInfo prop)
    {
        return prop.GetMethod is { IsAssembly: true } or { IsFamilyOrAssembly: true } ||
               prop.SetMethod is { IsAssembly: true } or { IsFamilyOrAssembly: true };
    }

    /// <summary>
    /// Returns <see langword="true" /> if the property is abstract, or <see langword="false" /> otherwise.
    /// </summary>
    /// <param name="prop">The property to check.</param>
    public static bool IsAbstract(this PropertyInfo prop)
    {
        return prop.GetMethod is { IsAbstract: true } || prop.SetMethod is { IsAbstract: true };
    }
}

/// <summary>
/// Defines the kinds of members you want to get when querying for the fields and properties of a type.
/// </summary>
[Flags]
internal enum MemberKind
{
    None,
    Public = 1,
    Internal = 2,
    ExplicitlyImplemented = 4,
    DefaultInterfaceProperties = 8,
    Static = 16
}

internal static class MemberKindExtensions
{
    public static BindingFlags ToBindingFlags(this MemberKind kind)
    {
        BindingFlags flags = BindingFlags.Default;

        if ((kind & MemberKind.Public) != MemberKind.None)
        {
            flags |= BindingFlags.Public;
        }

        if ((kind & MemberKind.Internal) != MemberKind.None)
        {
            flags |= BindingFlags.NonPublic;
        }

        return flags;
    }
}

/// <summary>
/// Helper class to get all the public and internal fields and properties from a type.
/// </summary>
internal sealed class Reflector(Type typeToReflect, MemberKind kind)
{
    private readonly List<FieldInfo> selectedFields = new();
    private readonly OrderedPropertyCollection selectedProperties = new();
    private readonly object lazyLoadingLock = new();
    private volatile PropertyInfo[] cachedProperties;
    private volatile FieldInfo[] cachedFields;

    public MemberInfo[] Members => [.. Properties, .. Fields];

    public PropertyInfo[] Properties
    {
        get
        {
            if (cachedProperties is null)
            {
                lock (lazyLoadingLock)
                {
                    if (cachedProperties is null)
                    {
                        LoadProperties(typeToReflect, kind);
                        cachedProperties = selectedProperties.ToArray();
                    }
                }
            }

            return cachedProperties;
        }
    }

    public FieldInfo[] Fields
    {
        get
        {
            if (cachedFields is null)
            {
                lock (lazyLoadingLock)
                {
                    if (cachedFields is null)
                    {
                        LoadFields(typeToReflect, kind);
                        cachedFields = selectedFields.ToArray();
                    }
                }
            }

            return cachedFields;
        }
    }

    private void LoadProperties(Type typeToReflect, MemberKind kind)
    {
        while (typeToReflect != null && typeToReflect != typeof(object))
        {
            BindingFlags flags = BindingFlags.DeclaredOnly | BindingFlags.Public | BindingFlags.NonPublic;
            flags |= (kind & MemberKind.Static) != MemberKind.None ? BindingFlags.Static : BindingFlags.Instance;

            var allProperties = typeToReflect.GetProperties(flags);

            AddNormalProperties(kind, allProperties);

            AddExplicitlyImplementedProperties(kind, allProperties);

            AddInterfaceProperties(typeToReflect, kind, flags);

            // Move to the base type
            typeToReflect = typeToReflect.BaseType;
        }
    }

    private void AddNormalProperties(MemberKind kind, PropertyInfo[] allProperties)
    {
        if ((kind & (MemberKind.Public | MemberKind.Internal | MemberKind.ExplicitlyImplemented)) != MemberKind.None)
        {
            foreach (var property in allProperties)
            {
                if (HasVisibility(kind, property) && !property.IsExplicitlyImplemented())
                {
                    selectedProperties.AddNormal(property);
                }
            }
        }
    }

    private static bool HasVisibility(MemberKind kind, PropertyInfo prop)
    {
        return ((kind & MemberKind.Public) != MemberKind.None && prop.IsPublic()) ||
               ((kind & MemberKind.Internal) != MemberKind.None && prop.IsInternal());
    }

    private void AddExplicitlyImplementedProperties(MemberKind kind, PropertyInfo[] allProperties)
    {
        if ((kind & MemberKind.ExplicitlyImplemented) != MemberKind.None)
        {
            foreach (var property in allProperties)
            {
                if (property.IsExplicitlyImplemented())
                {
                    selectedProperties.AddExplicitlyImplemented(property);
                }
            }
        }
    }

#pragma warning disable AV1561
    private void AddInterfaceProperties(Type typeToReflect, MemberKind kind, BindingFlags flags)
    {
        if ((kind & MemberKind.DefaultInterfaceProperties) != MemberKind.None || typeToReflect.IsInterface)
        {
            var interfaces = typeToReflect.GetInterfaces();

            foreach (var interfaceType in interfaces)
            {
                foreach (var prop in interfaceType.GetProperties(flags))
                {
                    if (!prop.IsAbstract() || typeToReflect.IsInterface)
                    {
                        selectedProperties.AddFromInterface(prop);
                    }
                }
            }
        }
    }
#pragma warning restore AV1561

    private void LoadFields(Type typeToReflect, MemberKind kind)
    {
        var collectedFieldNames = new HashSet<string>();

        while (typeToReflect != null && typeToReflect != typeof(object))
        {
            BindingFlags flags = BindingFlags.DeclaredOnly | BindingFlags.Public | BindingFlags.NonPublic;
            flags |= (kind & MemberKind.Static) != MemberKind.None ? BindingFlags.Static : BindingFlags.Instance;

            var files = typeToReflect.GetFields(flags);

            foreach (var field in files)
            {
                if (HasVisibility(kind, field) && collectedFieldNames.Add(field.Name))
                {
                    selectedFields.Add(field);
                }
            }

            // Move to the base type
            typeToReflect = typeToReflect.BaseType;
        }
    }

    private static bool HasVisibility(MemberKind kind, FieldInfo field)
    {
        return ((kind & MemberKind.Public) != MemberKind.None && field.IsPublic) ||
               ((kind & MemberKind.Internal) != MemberKind.None && (field.IsAssembly || field.IsFamilyOrAssembly));
    }

    private class OrderedPropertyCollection : IEnumerable<PropertyInfo>
    {
        private readonly Dictionary<string, PropertyKind> kindMap = new();
        private readonly List<(string Name, PropertyInfo Property)> propertiesWithName = new();

        public PropertyInfo[] ToArray()
        {
            var result = new PropertyInfo[propertiesWithName.Count];

            for (int i = 0; i < propertiesWithName.Count; i++)
            {
                result[i] = propertiesWithName[i].Property;
            }

            return result;
        }

        public IEnumerator<PropertyInfo> GetEnumerator()
        {
            foreach (var (_, property) in propertiesWithName)
            {
                yield return property;
            }
        }

        IEnumerator IEnumerable.GetEnumerator()
        {
            return GetEnumerator();
        }

        private enum PropertyKind
        {
            Normal,
            ExplicitlyImplemented,
            Interface
        }

        public void AddExplicitlyImplemented(PropertyInfo property)
        {
            var name = property.Name.Split('.').Last();

            Add(name, property, PropertyKind.ExplicitlyImplemented);
        }

        public void AddNormal(PropertyInfo property)
        {
            Add(property.Name, property, PropertyKind.Normal);
        }

        public void AddFromInterface(PropertyInfo property)
        {
            Add(property.Name, property, PropertyKind.Interface);
        }

        private void Add(string name, PropertyInfo property, PropertyKind kind)
        {
            if (property.IsIndexer())
            {
                // We explicitly skip indexers
            }
            else if (!kindMap.TryGetValue(name, out var existingKind))
            {
                kindMap[name] = kind;
                propertiesWithName.Add((name, property));
            }
            else if (existingKind == PropertyKind.ExplicitlyImplemented && kind == PropertyKind.Normal)
            {
                // Normal properties have priority over explicitly implemented properties
                kindMap[name] = kind;

                for (int i = 0; i < propertiesWithName.Count; i++)
                {
                    if (propertiesWithName[i].Name == name)
                    {
                        propertiesWithName.RemoveAt(i);
                        break;
                    }
                }

                propertiesWithName.Add((name, property));
            }
            else
            {
                // Property with that name already exists
            }
        }
    }
}

dennisdoomen / reflectify / 23978952007

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