460 lines
24 KiB
C#
460 lines
24 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Globalization;
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using System.Linq;
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using System.Numerics;
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using System.Reflection;
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#if NET6_0_OR_GREATER
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using System.Diagnostics.CodeAnalysis;
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#endif
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namespace DynamicEnums {
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/// <summary>
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/// A dynamic enum is a class that represents enum-like single-instance value behavior with additional capabilities, including dynamic addition of new arbitrary values.
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/// A dynamic enum uses <see cref="BigInteger"/> as its underlying type, allowing for an arbitrary number of enum values to be created, even when a <see cref="FlagsAttribute"/>-like structure is used that would only allow for up to 64 values in a regular enum.
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/// All boolean operations including <see cref="And{T}"/>, <see cref="Or{T}"/>, <see cref="Xor{T}"/> and <see cref="Neg{T}"/> are supported and can be implemented in derived classes using operator overloads.
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/// To create a custom dynamic enum, simply create a class that extends <see cref="DynamicEnum"/>. New values can then be added using <see cref="Add{T}"/>, <see cref="AddValue{T}"/> or <see cref="AddFlag{T}"/>.
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/// </summary>
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/// <remarks>
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/// To include enum-like operator overloads in a dynamic enum named MyEnum, the following code can be used:
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/// <code>
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/// public static implicit operator BigInteger(MyEnum value) => DynamicEnum.GetValue(value);
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/// public static implicit operator MyEnum(BigInteger value) => DynamicEnum.GetEnumValue<MyEnum>(value);
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/// public static MyEnum operator |(MyEnum left, MyEnum right) => DynamicEnum.Or(left, right);
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/// public static MyEnum operator &(MyEnum left, MyEnum right) => DynamicEnum.And(left, right);
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/// public static MyEnum operator ^(MyEnum left, MyEnum right) => DynamicEnum.Xor(left, right);
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/// public static MyEnum operator ~(MyEnum value) => DynamicEnum.Neg(value);
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/// </code>
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/// </remarks>
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public abstract class DynamicEnum {
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private static readonly Dictionary<Type, Storage> Storages = new Dictionary<Type, Storage>();
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private readonly BigInteger value;
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private Dictionary<DynamicEnum, bool> allFlagsCache;
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private Dictionary<DynamicEnum, bool> anyFlagsCache;
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private string name;
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/// <summary>
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/// Creates a new dynamic enum instance.
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/// This constructor is protected as it is only invoked via reflection.
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/// </summary>
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/// <param name="name">The name of the enum value</param>
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/// <param name="value">The value</param>
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protected DynamicEnum(string name, BigInteger value) {
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this.value = value;
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this.name = name;
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}
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/// <summary>
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/// Returns true if this enum value has all of the given <see cref="DynamicEnum"/> flags on it.
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/// This operation is equivalent to <see cref="Enum.HasFlag"/>.
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/// </summary>
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/// <seealso cref="HasAnyFlags"/>
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/// <param name="flags">The flags to query</param>
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/// <returns>True if all of the flags are present, false otherwise</returns>
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public bool HasAllFlags(DynamicEnum flags) {
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if (this.allFlagsCache == null)
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this.allFlagsCache = new Dictionary<DynamicEnum, bool>();
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if (!this.allFlagsCache.TryGetValue(flags, out var ret)) {
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ret = (DynamicEnum.GetValue(this) & DynamicEnum.GetValue(flags)) == DynamicEnum.GetValue(flags);
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this.allFlagsCache.Add(flags, ret);
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}
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return ret;
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}
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/// <summary>
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/// Returns true if this enum value has any of the given <see cref="DynamicEnum"/> flags on it
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/// </summary>
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/// <seealso cref="HasAllFlags"/>
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/// <param name="flags">The flags to query</param>
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/// <returns>True if one of the flags is present, false otherwise</returns>
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public bool HasAnyFlags(DynamicEnum flags) {
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if (this.anyFlagsCache == null)
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this.anyFlagsCache = new Dictionary<DynamicEnum, bool>();
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if (!this.anyFlagsCache.TryGetValue(flags, out var ret)) {
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ret = (DynamicEnum.GetValue(this) & DynamicEnum.GetValue(flags)) != 0;
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this.anyFlagsCache.Add(flags, ret);
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}
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return ret;
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}
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/// <summary>Returns a string that represents the current object.</summary>
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/// <returns>A string that represents the current object.</returns>
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public override string ToString() {
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if (this.name == null) {
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var included = new List<DynamicEnum>();
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if (DynamicEnum.GetValue(this) != 0) {
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foreach (var v in DynamicEnum.GetValues(this.GetType())) {
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if (this.HasAllFlags(v) && DynamicEnum.GetValue(v) != 0)
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included.Add(v);
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}
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}
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this.name = included.Count > 0 ? string.Join(" | ", included) : DynamicEnum.GetValue(this).ToString();
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}
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return this.name;
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}
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/// <summary>
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/// Adds a new enum value to the given enum type <typeparamref name="T"/>
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/// </summary>
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/// <param name="name">The name of the enum value to add</param>
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/// <param name="value">The value to add</param>
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/// <typeparam name="T">The type to add this value to</typeparam>
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/// <returns>The newly created enum value</returns>
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/// <exception cref="ArgumentException">Thrown if the name or value passed are already present</exception>
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public static T Add<
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#if NET6_0_OR_GREATER
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[DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.PublicConstructors | DynamicallyAccessedMemberTypes.NonPublicConstructors)]
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#endif
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T>(string name, BigInteger value) where T : DynamicEnum {
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var storage = DynamicEnum.GetStorage(typeof(T));
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// cached parsed values and names might be incomplete with new values
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storage.ClearCaches();
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if (storage.Values.ContainsKey(value))
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throw new ArgumentException($"Duplicate value {value}", nameof(value));
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foreach (var v in storage.Values.Values) {
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if (v.name == name)
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throw new ArgumentException($"Duplicate name {name}", nameof(name));
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}
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var ret = DynamicEnum.Construct(typeof(T), name, value);
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storage.Values.Add(value, ret);
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return (T) ret;
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}
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/// <summary>
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/// Adds a new enum value to the given enum type <typeparamref name="T"/>.
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/// This method differs from <see cref="Add{T}"/> in that it automatically determines a value.
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/// The value determined will be the next free number in a sequence, which represents the default behavior in an enum if enum values are not explicitly numbered.
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/// </summary>
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/// <param name="name">The name of the enum value to add</param>
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/// <typeparam name="T">The type to add this value to</typeparam>
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/// <returns>The newly created enum value</returns>
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public static T AddValue<
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#if NET6_0_OR_GREATER
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[DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.PublicConstructors | DynamicallyAccessedMemberTypes.NonPublicConstructors)]
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#endif
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T>(string name) where T : DynamicEnum {
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BigInteger value = 0;
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while (DynamicEnum.IsDefined(typeof(T), value))
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value++;
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return DynamicEnum.Add<T>(name, value);
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}
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/// <summary>
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/// Adds a new flag enum value to the given enum type <typeparamref name="T"/>.
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/// This method differs from <see cref="Add{T}"/> in that it automatically determines a value.
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/// The value determined will be the next free power of two, allowing enum values to be combined using bitwise operations to create <see cref="FlagsAttribute"/>-like behavior.
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/// </summary>
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/// <param name="name">The name of the enum value to add</param>
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/// <typeparam name="T">The type to add this value to</typeparam>
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/// <returns>The newly created enum value</returns>
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public static T AddFlag<
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#if NET6_0_OR_GREATER
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[DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.PublicConstructors | DynamicallyAccessedMemberTypes.NonPublicConstructors)]
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#endif
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T>(string name) where T : DynamicEnum {
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BigInteger value = 1;
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while (DynamicEnum.IsDefined(typeof(T), value))
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value <<= 1;
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return DynamicEnum.Add<T>(name, value);
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}
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/// <summary>
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/// Returns a collection of all of the enum values that are explicitly defined for the given dynamic enum type <typeparamref name="T"/>.
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/// A value counts as explicitly defined if it has been added using <see cref="Add{T}"/>, <see cref="AddValue{T}"/> or <see cref="AddFlag{T}"/>.
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/// </summary>
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/// <typeparam name="T">The type whose values to get</typeparam>
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/// <returns>The defined values for the given type</returns>
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public static IEnumerable<T> GetValues<T>() where T : DynamicEnum {
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return DynamicEnum.GetValues(typeof(T)).Cast<T>();
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}
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/// <summary>
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/// Returns a collection of all of the enum values that are explicitly defined for the given dynamic enum type <paramref name="type"/>.
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/// A value counts as explicitly defined if it has been added using <see cref="Add{T}"/>, <see cref="AddValue{T}"/> or <see cref="AddFlag{T}"/>.
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/// </summary>
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/// <param name="type">The type whose values to get</param>
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/// <returns>The defined values for the given type</returns>
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public static IEnumerable<DynamicEnum> GetValues(Type type) {
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return DynamicEnum.GetStorage(type).Values.Values;
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}
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/// <summary>
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/// Returns all of the defined values from the given dynamic enum type <typeparamref name="T"/> which are contained in <paramref name="combinedFlag"/>.
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/// Note that, if combined flags are defined in <typeparamref name="T"/>, and <paramref name="combinedFlag"/> contains them, they will also be returned.
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/// </summary>
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/// <param name="combinedFlag">The combined flags whose individual flags to return.</param>
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/// <param name="includeZero">Whether the enum value 0 should also be returned, if <typeparamref name="T"/> contains one.</param>
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/// <typeparam name="T">The type of enum.</typeparam>
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/// <returns>All of the flags that make up <paramref name="combinedFlag"/>.</returns>
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public static IEnumerable<T> GetFlags<T>(T combinedFlag, bool includeZero = true) where T : DynamicEnum {
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foreach (var flag in DynamicEnum.GetValues<T>()) {
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if (combinedFlag.HasAllFlags(flag) && (includeZero || DynamicEnum.GetValue(flag) != BigInteger.Zero))
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yield return flag;
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}
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}
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/// <summary>
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/// Returns all of the defined unique flags from the given dynamic enum type <typeparamref name="T"/> which are contained in <paramref name="combinedFlag"/>.
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/// Any combined flags (flags that aren't powers of two) which are defined in <typeparamref name="T"/> will not be returned.
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/// </summary>
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/// <param name="combinedFlag">The combined flags whose individual flags to return.</param>
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/// <typeparam name="T">The type of enum.</typeparam>
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/// <returns>All of the unique flags that make up <paramref name="combinedFlag"/>.</returns>
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public static IEnumerable<T> GetUniqueFlags<
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#if NET6_0_OR_GREATER
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[DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.PublicConstructors | DynamicallyAccessedMemberTypes.NonPublicConstructors)]
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#endif
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T>(T combinedFlag) where T : DynamicEnum {
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// we can't use the same method here as EnumHelper.GetUniqueFlags since DynamicEnum doesn't guarantee sorted values
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var max = DynamicEnum.GetValues<T>().Max(DynamicEnum.GetValue);
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var uniqueFlag = BigInteger.One;
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while (uniqueFlag <= max) {
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if (DynamicEnum.IsDefined(typeof(T), uniqueFlag)) {
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var uniqueFlagValue = DynamicEnum.GetEnumValue<T>(uniqueFlag);
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if (combinedFlag.HasAnyFlags(uniqueFlagValue))
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yield return uniqueFlagValue;
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}
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uniqueFlag <<= 1;
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}
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}
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/// <summary>
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/// Returns the bitwise OR (|) combination of the two dynamic enum values
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/// </summary>
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/// <param name="left">The left value</param>
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/// <param name="right">The right value</param>
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/// <typeparam name="T">The type of the values</typeparam>
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/// <returns>The bitwise OR (|) combination</returns>
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public static T Or<
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#if NET6_0_OR_GREATER
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[DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.PublicConstructors | DynamicallyAccessedMemberTypes.NonPublicConstructors)]
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#endif
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T>(T left, T right) where T : DynamicEnum {
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var cache = DynamicEnum.GetStorage(typeof(T)).OrCache;
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if (!cache.TryGetValue((left, right), out var ret)) {
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ret = DynamicEnum.GetEnumValue<T>(DynamicEnum.GetValue(left) | DynamicEnum.GetValue(right));
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cache.Add((left, right), ret);
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}
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return (T) ret;
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}
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/// <summary>
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/// Returns the bitwise AND (&) combination of the two dynamic enum values
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/// </summary>
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/// <param name="left">The left value</param>
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/// <param name="right">The right value</param>
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/// <typeparam name="T">The type of the values</typeparam>
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/// <returns>The bitwise AND (&) combination</returns>
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public static T And<
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#if NET6_0_OR_GREATER
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[DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.PublicConstructors | DynamicallyAccessedMemberTypes.NonPublicConstructors)]
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#endif
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T>(T left, T right) where T : DynamicEnum {
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var cache = DynamicEnum.GetStorage(typeof(T)).AndCache;
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if (!cache.TryGetValue((left, right), out var ret)) {
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ret = DynamicEnum.GetEnumValue<T>(DynamicEnum.GetValue(left) & DynamicEnum.GetValue(right));
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cache.Add((left, right), ret);
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}
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return (T) ret;
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}
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/// <summary>
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/// Returns the bitwise XOR (^) combination of the two dynamic enum values
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/// </summary>
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/// <param name="left">The left value</param>
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/// <param name="right">The right value</param>
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/// <typeparam name="T">The type of the values</typeparam>
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/// <returns>The bitwise XOR (^) combination</returns>
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public static T Xor<
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#if NET6_0_OR_GREATER
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[DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.PublicConstructors | DynamicallyAccessedMemberTypes.NonPublicConstructors)]
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#endif
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T>(T left, T right) where T : DynamicEnum {
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var cache = DynamicEnum.GetStorage(typeof(T)).XorCache;
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if (!cache.TryGetValue((left, right), out var ret)) {
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ret = DynamicEnum.GetEnumValue<T>(DynamicEnum.GetValue(left) ^ DynamicEnum.GetValue(right));
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cache.Add((left, right), ret);
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}
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return (T) ret;
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}
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/// <summary>
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/// Returns the bitwise NEG (~) combination of the dynamic enum value
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/// </summary>
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/// <param name="value">The value</param>
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/// <typeparam name="T">The type of the values</typeparam>
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/// <returns>The bitwise NEG (~) value</returns>
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public static T Neg<
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#if NET6_0_OR_GREATER
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[DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.PublicConstructors | DynamicallyAccessedMemberTypes.NonPublicConstructors)]
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#endif
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T>(T value) where T : DynamicEnum {
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var cache = DynamicEnum.GetStorage(typeof(T)).NegCache;
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if (!cache.TryGetValue(value, out var ret)) {
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ret = DynamicEnum.GetEnumValue<T>(~DynamicEnum.GetValue(value));
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cache.Add(value, ret);
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}
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return (T) ret;
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}
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/// <summary>
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/// Returns the <see cref="BigInteger"/> representation of the given dynamic enum value
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/// </summary>
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/// <param name="value">The value whose number representation to get</param>
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/// <returns>The value's number representation</returns>
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public static BigInteger GetValue(DynamicEnum value) {
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return value?.value ?? 0;
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}
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/// <summary>
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/// Returns the defined or combined dynamic enum value for the given <see cref="BigInteger"/> representation
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/// </summary>
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/// <param name="value">The value whose dynamic enum value to get</param>
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/// <typeparam name="T">The type that the returned dynamic enum should have</typeparam>
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/// <returns>The defined or combined dynamic enum value</returns>
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public static T GetEnumValue<
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#if NET6_0_OR_GREATER
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[DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.PublicConstructors | DynamicallyAccessedMemberTypes.NonPublicConstructors)]
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#endif
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T>(BigInteger value) where T : DynamicEnum {
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return (T) DynamicEnum.GetEnumValue(typeof(T), value);
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}
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/// <summary>
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/// Returns the defined or combined dynamic enum value for the given <see cref="BigInteger"/> representation
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/// </summary>
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/// <param name="type">The type that the returned dynamic enum should have</param>
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/// <param name="value">The value whose dynamic enum value to get</param>
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/// <returns>The defined or combined dynamic enum value</returns>
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public static DynamicEnum GetEnumValue(
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#if NET6_0_OR_GREATER
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[DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.PublicConstructors | DynamicallyAccessedMemberTypes.NonPublicConstructors)]
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#endif
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Type type, BigInteger value) {
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var storage = DynamicEnum.GetStorage(type);
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// get the defined value if it exists
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if (storage.Values.TryGetValue(value, out var defined))
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return defined;
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// otherwise, cache the combined value
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if (!storage.FlagCache.TryGetValue(value, out var combined)) {
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combined = DynamicEnum.Construct(type, null, value);
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storage.FlagCache.Add(value, combined);
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}
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return combined;
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}
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/// <summary>
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/// Parses the given <see cref="string"/> into a dynamic enum value and returns the result.
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/// This method supports defined enum values as well as values combined using the pipe (|) character and any number of spaces.
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/// If no enum value can be parsed, null is returned.
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/// </summary>
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/// <param name="strg">The string to parse into a dynamic enum value</param>
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/// <typeparam name="T">The type of the dynamic enum value to parse</typeparam>
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/// <returns>The parsed enum value, or null if parsing fails</returns>
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public static T Parse<
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#if NET6_0_OR_GREATER
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[DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.PublicConstructors | DynamicallyAccessedMemberTypes.NonPublicConstructors)]
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#endif
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T>(string strg) where T : DynamicEnum {
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return (T) DynamicEnum.Parse(typeof(T), strg);
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}
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/// <summary>
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/// Parses the given <see cref="string"/> into a dynamic enum value and returns the result.
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/// This method supports defined enum values as well as values combined using the pipe (|) character and any number of spaces.
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/// If no enum value can be parsed, null is returned.
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/// </summary>
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/// <param name="type">The type of the dynamic enum value to parse</param>
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/// <param name="strg">The string to parse into a dynamic enum value</param>
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/// <returns>The parsed enum value, or null if parsing fails</returns>
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public static DynamicEnum Parse(
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#if NET6_0_OR_GREATER
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[DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.PublicConstructors | DynamicallyAccessedMemberTypes.NonPublicConstructors)]
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#endif
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Type type, string strg) {
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var cache = DynamicEnum.GetStorage(type).ParseCache;
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if (!cache.TryGetValue(strg, out var cached)) {
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BigInteger? accum = null;
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foreach (var val in strg.Split('|')) {
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foreach (var defined in DynamicEnum.GetValues(type)) {
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if (defined.name == val.Trim()) {
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accum = (accum ?? 0) | DynamicEnum.GetValue(defined);
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break;
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}
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}
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}
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if (accum != null)
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cached = DynamicEnum.GetEnumValue(type, accum.Value);
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cache.Add(strg, cached);
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}
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return cached;
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}
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/// <summary>
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/// Returns whether the given <paramref name="value"/> is defined in the given dynamic enum <paramref name="type"/>.
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/// A value counts as explicitly defined if it has been added using <see cref="Add{T}"/>, <see cref="AddValue{T}"/> or <see cref="AddFlag{T}"/>.
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/// </summary>
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/// <param name="type">The dynamic enum type to query.</param>
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/// <param name="value">The value to query.</param>
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/// <returns>Whether the <paramref name="value"/> is defined.</returns>
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public static bool IsDefined(Type type, BigInteger value) {
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return DynamicEnum.GetStorage(type).Values.ContainsKey(value);
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}
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/// <summary>
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/// Returns whether the given <paramref name="value"/> is defined in its dynamic enum type.
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/// A value counts as explicitly defined if it has been added using <see cref="Add{T}"/>, <see cref="AddValue{T}"/> or <see cref="AddFlag{T}"/>.
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/// </summary>
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/// <param name="value">The value to query.</param>
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/// <returns>Whether the <paramref name="value"/> is defined.</returns>
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public static bool IsDefined(DynamicEnum value) {
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|
return value != null && DynamicEnum.IsDefined(value.GetType(), DynamicEnum.GetValue(value));
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}
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|
|
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private static Storage GetStorage(Type type) {
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|
if (!DynamicEnum.Storages.TryGetValue(type, out var storage)) {
|
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storage = new Storage();
|
|
DynamicEnum.Storages.Add(type, storage);
|
|
}
|
|
return storage;
|
|
}
|
|
|
|
private static DynamicEnum Construct(
|
|
#if NET6_0_OR_GREATER
|
|
[DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.PublicConstructors | DynamicallyAccessedMemberTypes.NonPublicConstructors)]
|
|
#endif
|
|
Type type, string name, BigInteger value) {
|
|
return (DynamicEnum) Activator.CreateInstance(type, BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic, null, new object[] {name, value}, CultureInfo.InvariantCulture);
|
|
}
|
|
|
|
private class Storage {
|
|
|
|
public readonly Dictionary<BigInteger, DynamicEnum> Values = new Dictionary<BigInteger, DynamicEnum>();
|
|
public readonly Dictionary<BigInteger, DynamicEnum> FlagCache = new Dictionary<BigInteger, DynamicEnum>();
|
|
public readonly Dictionary<string, DynamicEnum> ParseCache = new Dictionary<string, DynamicEnum>();
|
|
public readonly Dictionary<(DynamicEnum, DynamicEnum), DynamicEnum> OrCache = new Dictionary<(DynamicEnum, DynamicEnum), DynamicEnum>();
|
|
public readonly Dictionary<(DynamicEnum, DynamicEnum), DynamicEnum> AndCache = new Dictionary<(DynamicEnum, DynamicEnum), DynamicEnum>();
|
|
public readonly Dictionary<(DynamicEnum, DynamicEnum), DynamicEnum> XorCache = new Dictionary<(DynamicEnum, DynamicEnum), DynamicEnum>();
|
|
public readonly Dictionary<DynamicEnum, DynamicEnum> NegCache = new Dictionary<DynamicEnum, DynamicEnum>();
|
|
|
|
public void ClearCaches() {
|
|
this.FlagCache.Clear();
|
|
this.ParseCache.Clear();
|
|
this.OrCache.Clear();
|
|
this.AndCache.Clear();
|
|
this.XorCache.Clear();
|
|
this.NegCache.Clear();
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
} |