String segment find experiment

Source/EnumValue.cs

@@ -15,11 +15,12 @@
 namespace Open.Text;
 
 /// <summary>
-/// A case struct representing an enum value that can be implicitly coerced from a string.
+/// A struct representing an enum value that can be implicitly coerced from a string.
 /// </summary>
 /// <remarks>String parsing or coercion is case sensitive and must be exact.</remarks>
 [SuppressMessage("Usage", "CA2225:Operator overloads have named alternates", Justification = "Already exposes via a property.")]
 [SuppressMessage("Design", "CA1000:Do not declare static members on generic types", Justification = "Intentional")]
+[SuppressMessage("Roslynator", "RCS1158:Static member in generic type should use a type parameter.")]
 [DebuggerDisplay("{GetDebuggerDisplay()}")]
 public readonly struct EnumValue<TEnum>
 	: IEquatable<EnumValue<TEnum>>, IEquatable<EnumValueCaseIgnored<TEnum>>, IEquatable<TEnum>
@@ -34,29 +35,25 @@ public readonly struct EnumValue<TEnum>
 	public static Type UnderlyingType => _underlyingType ??= Enum.GetUnderlyingType(typeof(TEnum));
 
 	/// <summary>
-	/// Constructs an EnumValue&lt;<typeparamref name="TEnum"/>&gt; using the provided enum value.
+	/// Constructs an <see cref="EnumValue{TEnum}"/> using the provided <typeparamref name="TEnum"/> value.
 	/// </summary>
 	public EnumValue(TEnum value)
-	{
-		Value = value;
-	}
+		=> Value = value;
 
 	/// <summary>
-	/// Parses the string value to construct an EnumValue&lt;<typeparamref name="TEnum"/>&gt; instance.
+	/// Parses the <paramref name="value"/> to construct an <see cref="EnumValue{TEnum}"/>.
 	/// </summary>
 	/// <exception cref="ArgumentNullException">value is null.</exception>
 	public EnumValue(StringSegment value)
-	{
-		Value = EnumValue.Parse<TEnum>(value);
-	}
+		=> Value = EnumValue.Parse<TEnum>(value);
 
 	/// <summary>
-	/// The enum value that this represents.
+	/// The <typeparamref name="TEnum"/> value that this represents.
 	/// </summary>
 	public readonly TEnum Value { get; }
 
 	/// <summary>
-	/// Returns the string representation of the enum value.
+	/// Returns the <see cref="string"/> representation of the enum value.
 	/// </summary>
 	[MethodImpl(MethodImplOptions.AggressiveInlining)]
 	public override string ToString() => NameLookup(Value);
@@ -165,7 +162,18 @@ internal static Func<string, ValueLookupResult> ValueLookup
 	private static IReadOnlyDictionary<string, TEnum>? _ignoreCaseLookup;
 	internal static IReadOnlyDictionary<string, TEnum> IgnoreCaseLookup
 		=> LazyInitializer.EnsureInitialized(ref _ignoreCaseLookup,
-			() => Values.ToDictionary(e => Enum.GetName(typeof(TEnum), e)!, e => e, StringComparer.OrdinalIgnoreCase))!;
+			() =>
+			{
+				// If the enum has duplicate values, we want to use the first one.
+				var result = new Dictionary<string, TEnum>(StringComparer.OrdinalIgnoreCase);
+				foreach (var e in Values)
+				{
+					var v = Enum.GetName(typeof(TEnum), e);
+					if (result.ContainsKey(v)) continue;
+					result[v] = e;
+				}
+				return result;
+			})!;
 
 	static Entry[]?[] CreateLookup()
 	{
@@ -242,7 +250,6 @@ public static int Find(Span<Entry> span, ReadOnlySpan<char> name, StringComparis
 					return middle;
 			}
 
-
 			return -1;
 		}
 	}
@@ -253,49 +260,58 @@ internal static Entry[]?[] Lookup
 			() => CreateLookup())!;
 
 	/// <summary>
-	/// Indicates whether this instance matches the enum value of <paramref name="other"/>.
+	/// Indicates whether this instance matches the <typeparamref name="TEnum"/> value of <paramref name="other"/>.
 	/// </summary>
-	/// <returns>true if <paramref name="other"/>'s enum value and this instance's enum value are the same; otherwise false.</returns>
-	public bool Equals(EnumValue<TEnum> other) => Value.Equals(other.Value);
+	/// <returns>true if <paramref name="other"/>'s <typeparamref name="TEnum"/> value and this instance's <typeparamref name="TEnum"/> value are the same; otherwise false.</returns>
+	public bool Equals(EnumValue<TEnum> other)
+		=> Value.Equals(other.Value);
 
 	/// <summary>
-	/// Compares an EnumValue and EnumValueCaseIgnored for enum equality.
+	/// Compares an <see cref="EnumValue{TEnum}"/> and <see cref="EnumValueCaseIgnored{TEnum}"/> for <typeparamref name="TEnum"/> equality.
 	/// </summary>
-	public static bool operator ==(EnumValue<TEnum> left, EnumValue<TEnum> right) => left.Value.Equals(right.Value);
+	public static bool operator ==(EnumValue<TEnum> left, EnumValue<TEnum> right)
+		=> left.Value.Equals(right.Value);
 
 	/// <summary>
-	/// Compares an EnumValue and EnumValueCaseIgnored for enum inequality.
+	/// Compares an <see cref="EnumValue{TEnum}"/> and <see cref="EnumValueCaseIgnored{TEnum}"/> for <typeparamref name="TEnum"/> inequality.
 	/// </summary>
-	public static bool operator !=(EnumValue<TEnum> left, EnumValue<TEnum> right) => !left.Value.Equals(right.Value);
+	public static bool operator !=(EnumValue<TEnum> left, EnumValue<TEnum> right)
+		=> !left.Value.Equals(right.Value);
 
 	/// <inheritdoc cref="Equals(EnumValue{TEnum})"/>
-	public bool Equals(EnumValueCaseIgnored<TEnum> other) => Value.Equals(other.Value);
+	public bool Equals(EnumValueCaseIgnored<TEnum> other)
+		=> Value.Equals(other.Value);
 
 	/// <summary>
-	/// Compares two EnumValue for enum equality.
+	/// Compares two <see cref="EnumValue{TEnum}"/> for <typeparamref name="TEnum"/> equality.
 	/// </summary>
-	public static bool operator ==(EnumValue<TEnum> left, EnumValueCaseIgnored<TEnum> right) => left.Value.Equals(right.Value);
+	public static bool operator ==(EnumValue<TEnum> left, EnumValueCaseIgnored<TEnum> right)
+		=> left.Value.Equals(right.Value);
 
 	/// <summary>
-	/// Compares two EnumValue for enum inequality.
+	/// Compares two <see cref="EnumValue{TEnum}"/> for <typeparamref name="TEnum"/> inequality.
 	/// </summary>
-	public static bool operator !=(EnumValue<TEnum> left, EnumValueCaseIgnored<TEnum> right) => !left.Value.Equals(right.Value);
+	public static bool operator !=(EnumValue<TEnum> left, EnumValueCaseIgnored<TEnum> right)
+		=> !left.Value.Equals(right.Value);
 
 	/// <summary>
 	/// Indicates whether this instance matches the provided enum <paramref name="other"/>.
 	/// </summary>
 	/// <returns>true if <paramref name="other"/> and this instance's enum value are the same; otherwise false.</returns>
-	public bool Equals(TEnum other) => Value.Equals(other);
+	public bool Equals(TEnum other)
+		=> Value.Equals(other);
 
 	/// <summary>
-	/// Compares an EnumValue and an enum value for enum equality.
+	/// Compares an <see cref="EnumValue{TEnum}"/> and a <typeparamref name="TEnum"/> value forequality.
 	/// </summary>
-	public static bool operator ==(EnumValue<TEnum> left, TEnum right) => left.Value.Equals(right);
+	public static bool operator ==(EnumValue<TEnum> left, TEnum right)
+		=> left.Value.Equals(right);
 
 	/// <summary>
-	/// Compares an EnumValue and an enum value for enum inequality.
+	/// Compares an <see cref="EnumValue{TEnum}"/> and a <typeparamref name="TEnum"/> value for inequality.
 	/// </summary>
-	public static bool operator !=(EnumValue<TEnum> left, TEnum right) => !left.Value.Equals(right);
+	public static bool operator !=(EnumValue<TEnum> left, TEnum right)
+		=> !left.Value.Equals(right);
 
 	/// <inheritdoc />
 	public override bool Equals(object? obj)
@@ -307,23 +323,28 @@ public override bool Equals(object? obj)
 	public override int GetHashCode() => Value.GetHashCode();
 
 	/// <summary>
-	/// Implicitly converts an EnumValueCaseInsensitive to an EnumValue.
+	/// Implicitly converts an <see cref="EnumValueCaseIgnored{TEnum}"/> to an <see cref="EnumValue{TEnum}"/>.
 	/// Before conversion they are already equivalent.
 	/// </summary>
 	public static implicit operator EnumValue<TEnum>(EnumValueCaseIgnored<TEnum> value) => new(value.Value);
 
 	/// <summary>
-	/// Implicitly returns the actual enum contained by the EnumValue.
+	/// Implicitly returns the actual enum contained by the <see cref="EnumValue{TEnum}"/>.
 	/// </summary>
 	public static implicit operator TEnum(EnumValue<TEnum> value) => value.Value;
 
 	/// <summary>
-	/// Implicitly converts an string to an EnumValue of enum type TEnum.
+	/// Implicitly converts an <typeparamref name="TEnum"/> to an <see cref="EnumValue{TEnum}"/>.
+	/// </summary>
+	public static implicit operator EnumValue<TEnum>(TEnum value) => new(value);
+
+	/// <summary>
+	/// Implicitly converts a <see cref="string"/> to an <see cref="EnumValue{TEnum}"/>.
 	/// </summary>
 	public static implicit operator EnumValue<TEnum>(StringSegment value) => new(value);
 
 	/// <summary>
-	/// Implicitly converts an string to an EnumValue of enum type TEnum.
+	/// Implicitly converts a <see cref="string"/> to an <see cref="EnumValue{TEnum}"/>.
 	/// </summary>
 	public static implicit operator EnumValue<TEnum>(string value) => new(value);
 
@@ -374,21 +395,15 @@ public readonly struct EnumValueCaseIgnored<TEnum>
 	where TEnum : Enum
 {
 	/// <summary>
-	/// Constructs an EnumValueCaseIgnored&lt;<typeparamref name="TEnum"/>&gt; using the provided enum value.
+	/// Constructs an <see cref="EnumValueCaseIgnored{TEnum}"/> using the provided enum value.
 	/// </summary>
-	public EnumValueCaseIgnored(TEnum value)
-	{
-		Value = value;
-	}
+	public EnumValueCaseIgnored(TEnum value) => Value = value;
 
 	/// <summary>
-	/// Parses the string value to construct an EnumValueCaseIgnored&lt;<typeparamref name="TEnum"/>&gt; instance.
+	/// Parses the string value to construct an <see cref="EnumValueCaseIgnored{TEnum}"/> instance.
 	/// </summary>
 	/// <exception cref="ArgumentNullException"><paramref name="value"/> is null.</exception>
-	public EnumValueCaseIgnored(StringSegment value)
-	{
-		Value = EnumValue.Parse<TEnum>(value, true);
-	}
+	public EnumValueCaseIgnored(StringSegment value) => Value = EnumValue.Parse<TEnum>(value, true);
 
 	/// <inheritdoc cref="EnumValue{TEnum}.Value"/>
 	public readonly TEnum Value { get; }
@@ -400,12 +415,12 @@ public EnumValueCaseIgnored(StringSegment value)
 	public bool Equals(EnumValue<TEnum> other) => Value.Equals(other.Value);
 
 	/// <summary>
-	/// Compares an EnumValueCaseIgnored and EnumValue for enum equality.
+	/// Compares an <see cref="EnumValueCaseIgnored{TEnum}"/> and <see cref="EnumValue{TEnum}"/> for <typeparamref name="TEnum"/> equality.
 	/// </summary>
 	public static bool operator ==(EnumValueCaseIgnored<TEnum> left, EnumValue<TEnum> right) => left.Value.Equals(right.Value);
 
 	/// <summary>
-	/// Compares an EnumValueCaseIgnored and EnumValue for enum inequality.
+	/// Compares an <see cref="EnumValueCaseIgnored{TEnum}"/> and <see cref="EnumValue{TEnum}"/> for <typeparamref name="TEnum"/> inequality.
 	/// </summary>
 	public static bool operator !=(EnumValueCaseIgnored<TEnum> left, EnumValue<TEnum> right)
 		=> !left.Value.Equals(right.Value);
@@ -415,13 +430,13 @@ public bool Equals(EnumValueCaseIgnored<TEnum> other)
 		=> Value.Equals(other.Value);
 
 	/// <summary>
-	/// Compares two EnumValueCaseIgnored for enum equality.
+	/// Compares two <see cref="EnumValueCaseIgnored{TEnum}"/> for <typeparamref name="TEnum"/> equality.
 	/// </summary>
 	public static bool operator ==(EnumValueCaseIgnored<TEnum> left, EnumValueCaseIgnored<TEnum> right)
 		=> left.Value.Equals(right.Value);
 
 	/// <summary>
-	/// Compares two EnumValueCaseIgnored for enum inequality.
+	/// Compares two <see cref="EnumValueCaseIgnored{TEnum}"/> for <typeparamref name="TEnum"/> inequality.
 	/// </summary>
 	public static bool operator !=(EnumValueCaseIgnored<TEnum> left, EnumValueCaseIgnored<TEnum> right)
 		=> !left.Value.Equals(right.Value);
@@ -431,13 +446,13 @@ public bool Equals(TEnum other)
 		=> Value.Equals(other);
 
 	/// <summary>
-	/// Compares an EnumValueCaseIgnored and an enum value for enum equality.
+	/// Compares an <see cref="EnumValueCaseIgnored{TEnum}"/> and a <typeparamref name="TEnum"/> value for equality.
 	/// </summary>
 	public static bool operator ==(EnumValueCaseIgnored<TEnum> left, TEnum right)
 		=> left.Value.Equals(right);
 
 	/// <summary>
-	/// Compares an EnumValueCaseIgnored and an enum value for enum inequality.
+	/// Compares an <see cref="EnumValueCaseIgnored{TEnum}"/> and a <typeparamref name="TEnum"/> value for inequality.
 	/// </summary>
 	public static bool operator !=(EnumValueCaseIgnored<TEnum> left, TEnum right)
 		=> !left.Value.Equals(right);
@@ -453,34 +468,40 @@ public override int GetHashCode()
 		=> Value.GetHashCode();
 
 	/// <summary>
-	/// Implicitly converts an EnumValue to an EnumValueCaseInsensitive.
+	/// Implicitly converts an <see cref="EnumValue{TEnum}"/> to an <see cref="EnumValueCaseIgnored{TEnum}"/>.
 	/// Before conversion they are already equivalent.
 	/// </summary>
 	public static implicit operator EnumValueCaseIgnored<TEnum>(EnumValue<TEnum> value)
 		=> new(value.Value);
 
 	/// <summary>
-	/// Implicitly returns the actual enum contained by the EnumValueCaseIgnored.
+	/// Implicitly returns the actual <typeparamref name="TEnum"/> contained by the <see cref="EnumValueCaseIgnored{TEnum}"/>.
 	/// </summary>
 	public static implicit operator TEnum(EnumValueCaseIgnored<TEnum> value)
 		=> value.Value;
 
 	/// <summary>
-	/// Implicitly converts an string to an EnumValueCaseIgnored of enum type TEnum.
+	/// Implicitly converts an <typeparamref name="TEnum"/> to an <see cref="EnumValue{TEnum}"/>.
+	/// </summary>
+	public static implicit operator EnumValueCaseIgnored<TEnum>(TEnum value)
+		=> new(value);
+
+	/// <summary>
+	/// Implicitly converts a <see cref="string"/> to an <see cref="EnumValueCaseIgnored{TEnum}"/>.
 	/// </summary>
 	public static implicit operator EnumValueCaseIgnored<TEnum>(StringSegment value)
 		=> new(value);
 
 	/// <summary>
-	/// Implicitly converts an string to an EnumValueCaseIgnored of enum type TEnum.
+	/// Implicitly converts a <see cref="string"/> to an <see cref="EnumValueCaseIgnored{TEnum}"/>.
 	/// </summary>
 	public static implicit operator EnumValueCaseIgnored<TEnum>(string value)
 		=> new(value);
 
 	private string GetDebuggerDisplay()
 	{
 		var eType = typeof(TEnum);
-		return $"{eType.Name}.{Value} [EnumValueCaseIgnored<{eType.FullName}>]";
+		return $"{eType.Name}.{ToString()} [EnumValueCaseIgnored<{eType.FullName}>]";
 	}
 }
 

Source/Extensions._.cs

@@ -484,7 +484,6 @@ public static int GetHashCodeFromChars(this ReadOnlySpan<char> chars, StringComp
 
 				break;
 			}
-
 		}
 
 		return hash + length;

Source/Open.Text.csproj

@@ -19,7 +19,7 @@
 		<RepositoryUrl>https://github.com/Open-NET-Libraries/Open.Text</RepositoryUrl>
 		<RepositoryType>git</RepositoryType>
 		<PackageTags>string, span, enum, readonlyspan, text, format, split, trim, equals, trimmed equals, first, last, preceding, following, stringbuilder, extensions, stringcomparable, spancomparable, stringsegment, splitassegment</PackageTags>
-		<Version>6.6.3</Version>
+		<Version>6.7.0</Version>
 		<PackageReleaseNotes></PackageReleaseNotes>
 		<PackageLicenseExpression>MIT</PackageLicenseExpression>
 		<PublishRepositoryUrl>true</PublishRepositoryUrl>