wip

.forgejo/workflows/default.yml

@@ -34,6 +34,10 @@ jobs:
         run: |
           dotnet pack -p:ContinuousIntegrationBuild=true
 
+      - name: dotnet format --verify-no-changes
+        run: |
+          dotnet format --no-restore --verify-no-changes --verbosity normal
+
       - name: dotnet test
         run: |
           dotnet test -p:ContinuousIntegrationBuild=true

.forgejo/workflows/release.yml

@@ -25,6 +25,10 @@ jobs:
         run: |
           dotnet pack -p:ContinuousIntegrationBuild=true
 
+      - name: dotnet format --verify-no-changes
+        run: |
+          dotnet format --no-restore --verify-no-changes --verbosity normal
+
       - name: dotnet test
         run: |
           dotnet test -p:ContinuousIntegrationBuild=true

src/semver.tests/SemanticVersionRangeTests.cs

@@ -1,6 +1,8 @@
 // Copyright (c) The Geekeey Authors
 // SPDX-License-Identifier: EUPL-1.2
 
+using System.Text;
+
 namespace Geekeey.SemVer.Tests;
 
 internal sealed class SemanticVersionRangeTests
@@ -152,7 +154,7 @@ internal sealed class SemanticVersionRangeTests
 	[Test]
 	public async Task I_can_serialize_to_json()
 	{
-		var r = SemanticVersionRange.Parse("^1.2.3");
+		var r = SemanticVersionRange.Parse("[1.2.3,2.0.0)");
 		var json = System.Text.Json.JsonSerializer.Serialize(r);
 		await Assert.That(json).IsEqualTo("\"^1.2.3\"");
 	}
@@ -165,4 +167,37 @@ internal sealed class SemanticVersionRangeTests
 		await Assert.That(r.ToString()).IsEqualTo("^1.2.3");
 		await Assert.That(r.Satisfies(new SemanticVersion(1, 2, 4))).IsTrue();
 	}
+
+	[Test]
+	public async Task I_use_npm_short_format_by_default()
+	{
+		var value = SemanticVersionRange.Parse("[1.2.3,2.0.0)");
+		await Assert.That(value.ToString()).IsEqualTo("^1.2.3");
+	}
+
+	[Test]
+	[Arguments("^1.2.3", "m", "[1.2.3,2.0.0)")]
+	[Arguments("~1.2.3", "m", "[1.2.3,1.3.0)")]
+	[Arguments("1.2.3", "m", "[1.2.3]")]
+	[Arguments("[1.2.3,2.0.0)", "n", ">=1.2.3 <2.0.0")]
+	[Arguments("[1.2.3,2.0.0)", "ns", "^1.2.3")]
+	[Arguments("[1.2.3,1.3.0)", "ns", "~1.2.3")]
+	[Arguments("[1.2,1.3],[1.5,)", "n", ">=1.2.0 <=1.3.0 || >=1.5.0")]
+	[Arguments("*", "m", "(,)")]
+	public async Task I_can_convert_range_formats(string range, string format, string expected)
+	{
+		var value = SemanticVersionRange.Parse(range);
+		await Assert.That(value.ToString(format, null)).IsEqualTo(expected);
+	}
+
+	[Test]
+	public async Task I_can_format_ranges_to_chars()
+	{
+		var value = SemanticVersionRange.Parse("[1.2.3,2.0.0)");
+		var destination = new char[32];
+		var success = value.TryFormat(destination, out var charsWritten, "ns", null);
+
+		await Assert.That(success).IsTrue();
+		await Assert.That(new string(destination[..charsWritten])).IsEqualTo("^1.2.3");
+	}
 }

src/semver.tests/SemanticVersionTests.cs

@@ -13,6 +13,7 @@ internal sealed class SemanticVersionTests
 	{
 		Encoder = JavaScriptEncoder.UnsafeRelaxedJsonEscaping,
 	};
+
 	[Test]
 	[Arguments(0, 0, 0, 0)]
 	[Arguments(1, 1, 1, 0)]
@@ -137,17 +138,6 @@ internal sealed class SemanticVersionTests
 		await Assert.That(result.Metadata).IsEqualTo("build.1");
 	}
 
-	[Test]
-	public async Task I_can_parse_from_utf8()
-	{
-		var utf8 = "2.0.0-rc.1"u8;
-		var result = SemanticVersion.Parse(utf8);
-		await Assert.That(result.Major).IsEqualTo(2UL);
-		await Assert.That(result.Minor).IsEqualTo(0UL);
-		await Assert.That(result.Patch).IsEqualTo(0UL);
-		await Assert.That(result.Prerelease).IsEqualTo("rc.1");
-	}
-
 	[Test]
 	[Arguments(1, 2, 3, null, null, "1.2.3")]
 	[Arguments(1, 2, 3, "alpha", null, "1.2.3-alpha")]
@@ -172,17 +162,6 @@ internal sealed class SemanticVersionTests
 		await Assert.That(new string(dest[..charsWritten])).IsEqualTo("1.2.3-beta+456");
 	}
 
-	[Test]
-	public async Task I_can_format_to_utf8()
-	{
-		var v = new SemanticVersion(1, 2, 3, "beta", "456");
-		var dest = new byte[32];
-		var success = v.TryFormat(dest, out var bytesWritten, "f", null);
-
-		await Assert.That(success).IsTrue();
-		await Assert.That(Encoding.UTF8.GetString(dest[..bytesWritten])).IsEqualTo("1.2.3-beta+456");
-	}
-
 	[Test]
 	[Arguments(1, 2, 3, null, null, "\"1.2.3\"")]
 	[Arguments(1, 2, 3, "alpha", null, "\"1.2.3-alpha\"")]
@@ -221,10 +200,7 @@ internal sealed class SemanticVersionTests
 	[Test]
 	public async Task I_can_serialize_as_part_of_object()
 	{
-		var obj = new
+		var obj = new { Version = new SemanticVersion(1, 0, 0, "rc.1", "metadata") };
-		{
-			Version = new SemanticVersion(1, 0, 0, "rc.1", "metadata")
-		};
 		var json = JsonSerializer.Serialize(obj, RelaxedOptions);
 
 		await Assert.That(json).IsEqualTo("{\"Version\":\"1.0.0-rc.1+metadata\"}");

src/semver/Geekeey.SemVer.csproj

@@ -11,7 +11,7 @@
   </PropertyGroup>
 
   <ItemGroup Condition="'$(Configuration)' == 'Debug'">
-    <InternalsVisibleTo Include="$(AssemblyName).Tests" />
+    <InternalsVisibleTo Include="Geekeey.SemVer.Tests" />
   </ItemGroup>
 
   <PropertyGroup>

src/semver/SemanticVersion.Comparison.cs

@@ -0,0 +1,48 @@
+namespace Geekeey.SemVer;
+
+public readonly partial record struct SemanticVersion : IComparable, IComparable<SemanticVersion>
+{
+	/// <inheritdoc />
+	public int CompareTo(object? obj)
+	{
+		return obj is not SemanticVersion other ? 1 : CompareTo(other);
+	}
+
+	/// <inheritdoc />
+	public int CompareTo(SemanticVersion other)
+	{
+		return SemanticVersionComparer.Priority.Compare(this, other);
+	}
+
+	/// <summary>
+	/// Determines whether one version is less than another version.
+	/// </summary>
+	public static bool operator <(SemanticVersion left, SemanticVersion right)
+	{
+		return left.CompareTo(right) < 0;
+	}
+
+	/// <summary>
+	/// Determines whether one version is less than or equal to another version.
+	/// </summary>
+	public static bool operator <=(SemanticVersion left, SemanticVersion right)
+	{
+		return left.CompareTo(right) <= 0;
+	}
+
+	/// <summary>
+	/// Determines whether one version is greater than another version.
+	/// </summary>
+	public static bool operator >(SemanticVersion left, SemanticVersion right)
+	{
+		return left.CompareTo(right) > 0;
+	}
+
+	/// <summary>
+	/// Determines whether one version is greater than or equal to another version.
+	/// </summary>
+	public static bool operator >=(SemanticVersion left, SemanticVersion right)
+	{
+		return left.CompareTo(right) >= 0;
+	}
+}

src/semver/SemanticVersion.Formatting.cs

@@ -0,0 +1,114 @@
+using System.Buffers;
+using System.Globalization;
+
+namespace Geekeey.SemVer;
+
+public readonly partial record struct SemanticVersion : ISpanFormattable
+{
+	internal int RequiredBufferSize
+	{
+		get
+		{
+			var length = 0;
+			length += ulong.CountDigits(Major) + 1;
+			length += ulong.CountDigits(Minor) + 1;
+			length += ulong.CountDigits(Patch);
+			length += Prerelease is { Length: > 0 } ? 1 + Prerelease.Length : 0;
+			length += Metadata is { Length: > 0 } ? 1 + Metadata.Length : 0;
+			return length;
+		}
+	}
+
+	#region IFormattable
+
+	/// <inheritdoc />
+	/// <summary>
+	/// <para>s - Default SemVer - [1.2.3-beta.4]</para>
+	/// <para>f - Full SemVer - [1.2.3-beta.4+5]</para>
+	/// <para>r - Just the SemVer part relevant for compatibility comparison - [1.2.3]</para>
+	/// </summary>
+	public string ToString(string? format, IFormatProvider? formatProvider)
+	{
+		var capacity = RequiredBufferSize;
+		var shared = capacity > 256 ? ArrayPool<char>.Shared.Rent(capacity) : null;
+		try
+		{
+			scoped var buffer = shared.AsSpan();
+
+			if (shared is null)
+			{
+				buffer = stackalloc char[capacity];
+			}
+
+			_ = TryFormat(buffer, out var bytesWritten, format, formatProvider);
+
+			return new string(buffer[..bytesWritten]);
+		}
+		finally
+		{
+			if (shared is not null)
+			{
+				ArrayPool<char>.Shared.Return(shared);
+			}
+		}
+	}
+
+	#endregion
+
+	#region ISpanFormattable
+
+	/// <summary>
+	/// Tries to format the semantic version into the specified span of characters.
+	/// </summary>
+	/// <see cref="TryFormat(Span{char},out int,ReadOnlySpan{char},IFormatProvider)">ISpanFormattable.TryFormat</see>
+	public bool TryFormat(Span<char> destination, out int charsWritten)
+	{
+		return TryFormat(destination, out charsWritten, default, null);
+	}
+
+	/// <inheritdoc />
+	public bool TryFormat(Span<char> destination, out int charsWritten, ReadOnlySpan<char> format, IFormatProvider? provider)
+	{
+		if (!destination.TryWrite(NumberFormatInfo.InvariantInfo, $"{Major}.{Minor}.{Patch}", out charsWritten))
+		{
+			charsWritten = 0;
+			return false;
+		}
+
+		destination = destination[charsWritten..];
+
+		if (Prerelease is { Length: > 0 } && format is "s" or "f")
+		{
+			destination[0] = '-';
+
+			if (!Prerelease.AsSpan().TryCopyTo(destination[1..]))
+			{
+				charsWritten = 0;
+				return false;
+			}
+
+			destination = destination[(Prerelease.Length + 1)..];
+			charsWritten += Prerelease.Length + 1;
+		}
+
+		if (Metadata is { Length: > 0 } && format is "f")
+		{
+			destination[0] = '+';
+
+			if (!Metadata.AsSpan().TryCopyTo(destination[1..]))
+			{
+				charsWritten = 0;
+				return false;
+			}
+
+			destination = destination[(Metadata.Length + 1)..];
+			charsWritten += Metadata.Length + 1;
+		}
+
+		_ = destination;
+
+		return true;
+	}
+
+	#endregion
+}

src/semver/SemanticVersion.Parsing.cs

@@ -0,0 +1,132 @@
+using System.Diagnostics.CodeAnalysis;
+using System.Globalization;
+
+namespace Geekeey.SemVer;
+
+public readonly partial record struct SemanticVersion : ISpanParsable<SemanticVersion>
+{
+	#region IParsable
+
+	/// <summary>
+	/// Parses a string into a <see cref="SemanticVersion"/>.
+	/// </summary>
+	/// <see cref="Parse(string, IFormatProvider)"/>
+	public static SemanticVersion Parse(string s)
+	{
+		return Parse(s.AsSpan(), null);
+	}
+
+	/// <inheritdoc />
+	public static SemanticVersion Parse(string s, IFormatProvider? provider)
+	{
+		return Parse(s.AsSpan(), provider);
+	}
+
+	/// <summary>
+	/// Tries to parse a string into a <see cref="SemanticVersion"/>.
+	/// </summary>
+	/// <see cref="TryParse(string, IFormatProvider, out SemanticVersion)"/>
+	public static bool TryParse([NotNullWhen(true)] string? s, [MaybeNullWhen(false)] out SemanticVersion result)
+	{
+		return TryParse(s, null, out result);
+	}
+
+	/// <inheritdoc />
+	public static bool TryParse([NotNullWhen(true)] string? s, IFormatProvider? provider, [MaybeNullWhen(false)] out SemanticVersion result)
+	{
+		return TryParse(s.AsSpan(), provider, out result);
+	}
+
+	#endregion
+
+	#region ISpanParsable
+
+	/// <summary>
+	/// Parses a span of characters into a <see cref="SemanticVersion"/>.
+	/// </summary>
+	/// <see cref="Parse(ReadOnlySpan{char}, IFormatProvider)"/>
+	public static SemanticVersion Parse(ReadOnlySpan<char> s)
+	{
+		return Parse(s, null);
+	}
+
+	/// <inheritdoc />
+	public static SemanticVersion Parse(ReadOnlySpan<char> s, IFormatProvider? provider)
+	{
+		if (!TryParse(s, provider, out var version))
+		{
+			throw new FormatException($"The input string '{s}' was not in a correct format.");
+		}
+
+		return version;
+	}
+
+	/// <summary>
+	/// Tries to parse a span of characters into a <see cref="SemanticVersion"/>.
+	/// </summary>
+	/// <see cref="TryParse(ReadOnlySpan{char}, IFormatProvider, out SemanticVersion)"/>
+	public static bool TryParse(ReadOnlySpan<char> s, [MaybeNullWhen(false)] out SemanticVersion result)
+	{
+		return TryParse(s, null, out result);
+	}
+
+	/// <inheritdoc />
+	public static bool TryParse(ReadOnlySpan<char> s, IFormatProvider? provider, [MaybeNullWhen(false)] out SemanticVersion result)
+	{
+		result = default;
+		if (s.IsEmpty)
+		{
+			return false;
+		}
+
+		var metadata = default(string);
+		var plusIndex = s.IndexOf('+');
+		if (plusIndex >= 0)
+		{
+			metadata = s[(plusIndex + 1)..].ToString();
+			s = s[..plusIndex];
+		}
+
+		var prerelease = default(string);
+		var dashIndex = s.IndexOf('-');
+		if (dashIndex >= 0)
+		{
+			prerelease = s[(dashIndex + 1)..].ToString();
+			s = s[..dashIndex];
+		}
+
+		var firstDot = s.IndexOf('.');
+		if (firstDot < 0)
+		{
+			return false;
+		}
+
+		if (!ulong.TryParse(s[..firstDot], NumberStyles.None, CultureInfo.InvariantCulture, out var major))
+		{
+			return false;
+		}
+
+		s = s[(firstDot + 1)..];
+		var secondDot = s.IndexOf('.');
+		if (secondDot < 0)
+		{
+			return false;
+		}
+
+		if (!ulong.TryParse(s[..secondDot], NumberStyles.None, CultureInfo.InvariantCulture, out var minor))
+		{
+			return false;
+		}
+
+		s = s[(secondDot + 1)..];
+		if (!ulong.TryParse(s, NumberStyles.None, CultureInfo.InvariantCulture, out var patch))
+		{
+			return false;
+		}
+
+		result = new SemanticVersion(major, minor, patch, prerelease, metadata);
+		return true;
+	}
+
+	#endregion
+}

src/semver/SemanticVersion.cs

@@ -1,9 +1,4 @@
-using System.Buffers;
-using System.Diagnostics.CodeAnalysis;
-using System.Globalization;
-using System.Text;
 using System.Text.Json.Serialization;
-using System.Text.Unicode;
 
 namespace Geekeey.SemVer;
 
@@ -117,394 +112,3 @@ public readonly partial record struct SemanticVersion
 		return ToString(null, null);
 	}
 }
-
-public readonly partial record struct SemanticVersion : IComparable, IComparable<SemanticVersion>
-{
-	/// <inheritdoc />
-	public int CompareTo(object? obj)
-	{
-		return obj is not SemanticVersion other ? 1 : CompareTo(other);
-	}
-
-	/// <inheritdoc />
-	public int CompareTo(SemanticVersion other)
-	{
-		return SemanticVersionComparer.Priority.Compare(this, other);
-	}
-
-	/// <summary>
-	/// Determines whether one version is less than another version.
-	/// </summary>
-	public static bool operator <(SemanticVersion left, SemanticVersion right)
-	{
-		return left.CompareTo(right) < 0;
-	}
-
-	/// <summary>
-	/// Determines whether one version is less than or equal to another version.
-	/// </summary>
-	public static bool operator <=(SemanticVersion left, SemanticVersion right)
-	{
-		return left.CompareTo(right) <= 0;
-	}
-
-	/// <summary>
-	/// Determines whether one version is greater than another version.
-	/// </summary>
-	public static bool operator >(SemanticVersion left, SemanticVersion right)
-	{
-		return left.CompareTo(right) > 0;
-	}
-
-	/// <summary>
-	/// Determines whether one version is greater than or equal to another version.
-	/// </summary>
-	public static bool operator >=(SemanticVersion left, SemanticVersion right)
-	{
-		return left.CompareTo(right) >= 0;
-	}
-}
-
-public readonly partial record struct SemanticVersion : ISpanParsable<SemanticVersion>, IUtf8SpanParsable<SemanticVersion>
-{
-	#region IParsable
-
-	/// <summary>
-	/// Parses a string into a <see cref="SemanticVersion"/>.
-	/// </summary>
-	/// <see cref="Parse(string, IFormatProvider)"/>
-	public static SemanticVersion Parse(string s)
-	{
-		return Parse(s.AsSpan(), null);
-	}
-
-	/// <inheritdoc />
-	public static SemanticVersion Parse(string s, IFormatProvider? provider)
-	{
-		return Parse(s.AsSpan(), provider);
-	}
-
-	/// <summary>
-	/// Tries to parse a string into a <see cref="SemanticVersion"/>.
-	/// </summary>
-	/// <see cref="TryParse(string, IFormatProvider, out SemanticVersion)"/>
-	public static bool TryParse([NotNullWhen(true)] string? s, [MaybeNullWhen(false)] out SemanticVersion result)
-	{
-		return TryParse(s, null, out result);
-	}
-
-	/// <inheritdoc />
-	public static bool TryParse([NotNullWhen(true)] string? s, IFormatProvider? provider, [MaybeNullWhen(false)] out SemanticVersion result)
-	{
-		return TryParse(s.AsSpan(), provider, out result);
-	}
-
-	#endregion
-
-	#region ISpanParsable
-
-	/// <summary>
-	/// Parses a span of characters into a <see cref="SemanticVersion"/>.
-	/// </summary>
-	/// <see cref="Parse(ReadOnlySpan{char}, IFormatProvider)"/>
-	public static SemanticVersion Parse(ReadOnlySpan<char> s)
-	{
-		return Parse(s, null);
-	}
-
-	/// <inheritdoc />
-	public static SemanticVersion Parse(ReadOnlySpan<char> s, IFormatProvider? provider)
-	{
-		if (!TryParse(s, provider, out var version))
-		{
-			throw new FormatException($"The input string '{s}' was not in a correct format.");
-		}
-
-		return version;
-	}
-
-	/// <summary>
-	/// Tries to parse a span of characters into a <see cref="SemanticVersion"/>.
-	/// </summary>
-	/// <see cref="TryParse(ReadOnlySpan{char}, IFormatProvider, out SemanticVersion)"/>
-	public static bool TryParse(ReadOnlySpan<char> s, [MaybeNullWhen(false)] out SemanticVersion result)
-	{
-		return TryParse(s, null, out result);
-	}
-
-	/// <inheritdoc />
-	public static bool TryParse(ReadOnlySpan<char> s, IFormatProvider? provider, [MaybeNullWhen(false)] out SemanticVersion result)
-	{
-		result = default;
-		if (s.IsEmpty)
-		{
-			return false;
-		}
-
-		var metadata = default(string);
-		var plusIndex = s.IndexOf('+');
-		if (plusIndex >= 0)
-		{
-			metadata = s[(plusIndex + 1)..].ToString();
-			s = s[..plusIndex];
-		}
-
-		var prerelease = default(string);
-		var dashIndex = s.IndexOf('-');
-		if (dashIndex >= 0)
-		{
-			prerelease = s[(dashIndex + 1)..].ToString();
-			s = s[..dashIndex];
-		}
-
-		var firstDot = s.IndexOf('.');
-		if (firstDot < 0)
-		{
-			return false;
-		}
-
-		if (!ulong.TryParse(s[..firstDot], NumberStyles.None, CultureInfo.InvariantCulture, out var major))
-		{
-			return false;
-		}
-
-		s = s[(firstDot + 1)..];
-		var secondDot = s.IndexOf('.');
-		if (secondDot < 0)
-		{
-			return false;
-		}
-
-		if (!ulong.TryParse(s[..secondDot], NumberStyles.None, CultureInfo.InvariantCulture, out var minor))
-		{
-			return false;
-		}
-
-		s = s[(secondDot + 1)..];
-		if (!ulong.TryParse(s, NumberStyles.None, CultureInfo.InvariantCulture, out var patch))
-		{
-			return false;
-		}
-
-		result = new SemanticVersion(major, minor, patch, prerelease, metadata);
-		return true;
-	}
-
-	#endregion
-
-	#region IUtf8SpanParsable
-
-	/// <summary>
-	/// Parses a span of UTF-8 bytes into a <see cref="SemanticVersion"/>.
-	/// </summary>
-	/// <see cref="Parse(ReadOnlySpan{byte}, IFormatProvider)"/>
-	public static SemanticVersion Parse(ReadOnlySpan<byte> utf8Text)
-	{
-		return Parse(utf8Text, null);
-	}
-
-	/// <inheritdoc />
-	public static SemanticVersion Parse(ReadOnlySpan<byte> utf8Text, IFormatProvider? provider)
-	{
-		if (!TryParse(utf8Text, provider, out var version))
-		{
-			throw new FormatException($"The input string '{Encoding.UTF8.GetString(utf8Text)}' was not in a correct format.");
-		}
-
-		return version;
-	}
-
-	/// <summary>
-	/// Tries to parse a span of UTF-8 bytes into a <see cref="SemanticVersion"/>.
-	/// </summary>
-	/// <see cref="TryParse(ReadOnlySpan{byte}, IFormatProvider, out SemanticVersion)"/>
-	public static bool TryParse(ReadOnlySpan<byte> utf8Text, [MaybeNullWhen(false)] out SemanticVersion result)
-	{
-		return TryParse(utf8Text, null, out result);
-	}
-
-	/// <inheritdoc />
-	public static bool TryParse(ReadOnlySpan<byte> utf8Text, IFormatProvider? provider, [MaybeNullWhen(false)] out SemanticVersion result)
-	{
-		if (utf8Text.IsEmpty)
-		{
-			result = default;
-			return false;
-		}
-
-		var charCount = Encoding.UTF8.GetCharCount(utf8Text);
-		var chars = charCount <= 256 ? stackalloc char[charCount] : new char[charCount];
-		Encoding.UTF8.GetChars(utf8Text, chars);
-
-		return TryParse(chars, provider, out result);
-	}
-
-	#endregion
-}
-
-public readonly partial record struct SemanticVersion : ISpanFormattable, IUtf8SpanFormattable
-{
-	internal int RequiredBufferSize
-	{
-		get
-		{
-			var length = 0;
-			length += ulong.CountDigits(Major) + 1;
-			length += ulong.CountDigits(Minor) + 1;
-			length += ulong.CountDigits(Patch);
-			length += Prerelease is { Length: > 0 } ? 1 + Prerelease.Length : 0;
-			length += Metadata is { Length: > 0 } ? 1 + Metadata.Length : 0;
-			return length;
-		}
-	}
-
-	#region IFormattable
-
-	/// <inheritdoc />
-	/// <summary>
-	/// <para>s - Default SemVer - [1.2.3-beta.4]</para>
-	/// <para>f - Full SemVer - [1.2.3-beta.4+5]</para>
-	/// <para>r - Just the SemVer part relevant for compatibility comparison - [1.2.3]</para>
-	/// </summary>
-	public string ToString(string? format, IFormatProvider? formatProvider)
-	{
-		var capacity = RequiredBufferSize;
-		var shared = capacity > 256 ? ArrayPool<char>.Shared.Rent(capacity) : null;
-		try
-		{
-			scoped var buffer = shared.AsSpan();
-
-			if (shared is null)
-			{
-				buffer = stackalloc char[capacity];
-			}
-
-			_ = TryFormat(buffer, out var bytesWritten, format, formatProvider);
-
-			return new string(buffer[..bytesWritten]);
-		}
-		finally
-		{
-			if (shared is not null)
-			{
-				ArrayPool<char>.Shared.Return(shared);
-			}
-		}
-	}
-
-	#endregion
-
-	#region ISpanFormattable
-
-	/// <summary>
-	/// Tries to format the semantic version into the specified span of characters.
-	/// </summary>
-	/// <see cref="TryFormat(Span{char},out int,ReadOnlySpan{char},IFormatProvider)">ISpanFormattable.TryFormat</see>
-	public bool TryFormat(Span<char> destination, out int charsWritten)
-	{
-		return TryFormat(destination, out charsWritten, default, null);
-	}
-
-	/// <inheritdoc />
-	public bool TryFormat(Span<char> destination, out int charsWritten, ReadOnlySpan<char> format, IFormatProvider? provider)
-	{
-		if (!destination.TryWrite(NumberFormatInfo.InvariantInfo, $"{Major}.{Minor}.{Patch}", out charsWritten))
-		{
-			charsWritten = 0;
-			return false;
-		}
-
-		destination = destination[charsWritten..];
-
-		if (Prerelease is { Length: > 0 } && format is "s" or "f")
-		{
-			destination[0] = '-';
-
-			if (!Prerelease.AsSpan().TryCopyTo(destination[1..]))
-			{
-				charsWritten = 0;
-				return false;
-			}
-
-			destination = destination[(Prerelease.Length + 1)..];
-			charsWritten += Prerelease.Length + 1;
-		}
-
-		if (Metadata is { Length: > 0 } && format is "f")
-		{
-			destination[0] = '+';
-
-			if (!Metadata.AsSpan().TryCopyTo(destination[1..]))
-			{
-				charsWritten = 0;
-				return false;
-			}
-
-			destination = destination[(Metadata.Length + 1)..];
-			charsWritten += Metadata.Length + 1;
-		}
-
-		_ = destination;
-
-		return true;
-	}
-
-	#endregion
-
-	#region IUtf8SpanFormattable
-
-	/// <summary>
-	/// Tries to format the semantic version into the specified span of UTF-8 bytes.
-	/// </summary>
-	/// <see cref="TryFormat(Span{byte},out int,ReadOnlySpan{char},IFormatProvider)">IUtf8SpanFormattable.TryFormat</see>
-	public bool TryFormat(Span<byte> utf8Destination, out int bytesWritten)
-	{
-		return TryFormat(utf8Destination, out bytesWritten, default, null);
-	}
-
-	/// <inheritdoc />
-	public bool TryFormat(Span<byte> utf8Destination, out int bytesWritten, ReadOnlySpan<char> format, IFormatProvider? provider)
-	{
-		if (!Utf8.TryWrite(utf8Destination, NumberFormatInfo.InvariantInfo, $"{Major}.{Minor}.{Patch}", out bytesWritten))
-		{
-			bytesWritten = 0;
-			return false;
-		}
-
-		utf8Destination = utf8Destination[bytesWritten..];
-
-		if (Prerelease is { Length: > 0 } && format is "s" or "f")
-		{
-			utf8Destination[0] = (byte)'-';
-
-			if (Utf8.FromUtf16(Prerelease, utf8Destination[1..], out _, out var b) is not OperationStatus.Done)
-			{
-				bytesWritten = 0;
-				return false;
-			}
-
-			utf8Destination = utf8Destination[(b + 1)..];
-			bytesWritten += b + 1;
-		}
-
-		if (Metadata is { Length: > 0 } && format is "f")
-		{
-			utf8Destination[0] = (byte)'+';
-
-			if (Utf8.FromUtf16(Metadata, utf8Destination[1..], out _, out var b) is not OperationStatus.Done)
-			{
-				bytesWritten = 0;
-				return false;
-			}
-
-			utf8Destination = utf8Destination[(b + 1)..];
-			bytesWritten += b + 1;
-		}
-
-		_ = utf8Destination;
-
-		return true;
-	}
-
-	#endregion
-}

src/semver/SemanticVersionJsonConverter.cs

@@ -25,7 +25,7 @@ internal sealed class SemanticVersionJsonConverter : JsonConverter<SemanticVersi
 
 		try
 		{
-			return SemanticVersion.Parse(reader.ValueSpan);
+			return SemanticVersion.Parse(reader.GetString().AsSpan());
 		}
 		catch (FormatException e)
 		{
@@ -36,14 +36,14 @@ internal sealed class SemanticVersionJsonConverter : JsonConverter<SemanticVersi
 	public override void Write(Utf8JsonWriter writer, SemanticVersion value, JsonSerializerOptions options)
 	{
 		var capacity = value.RequiredBufferSize;
-		var shared = capacity > StackBufferThreshold ? ArrayPool<byte>.Shared.Rent(capacity) : null;
+		var shared = capacity > StackBufferThreshold ? ArrayPool<char>.Shared.Rent(capacity) : null;
 		try
 		{
 			scoped var buffer = shared.AsSpan();
 
 			if (shared is null)
 			{
-				buffer = stackalloc byte[capacity];
+				buffer = stackalloc char[capacity];
 			}
 
 			_ = value.TryFormat(buffer, out var bytesWritten, "f", null);
@@ -54,7 +54,7 @@ internal sealed class SemanticVersionJsonConverter : JsonConverter<SemanticVersi
 		{
 			if (shared is not null)
 			{
-				ArrayPool<byte>.Shared.Return(shared);
+				ArrayPool<char>.Shared.Return(shared);
 			}
 		}
 	}

src/semver/SemanticVersionRange.Formatting.cs

@@ -0,0 +1,465 @@
+// Copyright (c) The Geekeey Authors
+// SPDX-License-Identifier: EUPL-1.2
+
+using System.Buffers;
+using System.Text.Unicode;
+
+namespace Geekeey.SemVer;
+
+public readonly partial record struct SemanticVersionRange : ISpanFormattable
+{
+	private const int StackBufferThreshold = 256;
+
+	#region IFormattable
+
+	/// <inheritdoc />
+	public string ToString(string? format, IFormatProvider? formatProvider)
+	{
+		if (!TryGetFormat(format, out var rangeFormat))
+		{
+			throw new FormatException($"The format string '{format}' was not recognized.");
+		}
+
+		var capacity = GetRequiredBufferSize(rangeFormat);
+		var shared = capacity > StackBufferThreshold ? ArrayPool<char>.Shared.Rent(capacity) : null;
+		try
+		{
+			scoped var buffer = shared.AsSpan();
+
+			if (shared is null)
+			{
+				buffer = stackalloc char[capacity];
+			}
+
+			_ = TryFormatCore(buffer, out var charsWritten, rangeFormat);
+			return new string(buffer[..charsWritten]);
+		}
+		finally
+		{
+			if (shared is not null)
+			{
+				ArrayPool<char>.Shared.Return(shared);
+			}
+		}
+	}
+
+	#endregion
+
+	#region ISpanFormattable
+
+	/// <inheritdoc />
+	public bool TryFormat(Span<char> destination, out int charsWritten, ReadOnlySpan<char> format, IFormatProvider? provider)
+	{
+		if (!TryGetFormat(format, out var rangeFormat))
+		{
+			charsWritten = 0;
+			return false;
+		}
+
+		return TryFormatCore(destination, out charsWritten, rangeFormat);
+	}
+
+	#endregion
+
+	private bool TryFormatCore(Span<char> destination, out int charsWritten, RangeStringFormat format)
+	{
+		charsWritten = 0;
+
+		if (_sets is not { Length: > 0 } sets)
+		{
+			return TryWriteLiteral(ref destination, ref charsWritten, format is RangeStringFormat.Maven ? "(,)" : "*");
+		}
+
+		for (var i = 0; i < sets.Length; i++)
+		{
+			if (i > 0 && !TryWriteLiteral(ref destination, ref charsWritten, format is RangeStringFormat.Maven ? "," : " || "))
+			{
+				charsWritten = 0;
+				return false;
+			}
+
+			if (!TryWriteSet(ref destination, ref charsWritten, sets[i], format))
+			{
+				charsWritten = 0;
+				return false;
+			}
+		}
+
+		return true;
+	}
+
+	private int GetRequiredBufferSize(RangeStringFormat format)
+	{
+		if (_sets is not { Length: > 0 } sets)
+		{
+			return format is RangeStringFormat.Maven ? 3 : 1;
+		}
+
+		var length = 0;
+		for (var i = 0; i < sets.Length; i++)
+		{
+			if (i > 0)
+			{
+				length += format is RangeStringFormat.Maven ? 1 : 4;
+			}
+
+			length += GetSetRequiredBufferSize(sets[i], format);
+		}
+
+		return length;
+	}
+
+	private static int GetSetRequiredBufferSize(VersionConstraint[] set, RangeStringFormat format)
+	{
+		AnalyzeSet(set, out var effectiveCount, out var hasExact, out var exact, out var hasLower, out var lower, out var hasUpper, out var upper, out var hasUnsupported);
+
+		if (hasUnsupported)
+		{
+			return GetConstraintsRequiredBufferSize(set, false);
+		}
+
+		if (effectiveCount is 0)
+		{
+			return format is RangeStringFormat.Maven ? 3 : 1;
+		}
+
+		if (hasExact && effectiveCount is 1)
+		{
+			return exact.Version.RequiredBufferSize + (format is RangeStringFormat.Maven ? 2 : 0);
+		}
+
+		if (format is RangeStringFormat.NpmShort && hasLower && hasUpper && effectiveCount is 2 && TryGetShortNpmOperator(lower, upper, out _))
+		{
+			return lower.Version.RequiredBufferSize + 1;
+		}
+
+		if (format is RangeStringFormat.Maven)
+		{
+			return (hasLower ? lower.Version.RequiredBufferSize : 0) +
+				   (hasUpper ? upper.Version.RequiredBufferSize : 0) +
+				   3;
+		}
+
+		return GetConstraintsRequiredBufferSize(set, true);
+	}
+
+	private static int GetConstraintsRequiredBufferSize(VersionConstraint[] set, bool bareEquals)
+	{
+		var length = 0;
+		var written = 0;
+		foreach (var constraint in set)
+		{
+			if (constraint.Comparator is Comparator.Any)
+			{
+				continue;
+			}
+
+			if (written > 0)
+			{
+				length++;
+			}
+
+			length += GetConstraintRequiredBufferSize(constraint, bareEquals);
+			written++;
+		}
+
+		return written is 0 ? 1 : length;
+	}
+
+	private static int GetConstraintRequiredBufferSize(VersionConstraint constraint, bool bareEquals)
+	{
+		return constraint.Comparator switch
+		{
+			Comparator.Equal when bareEquals => constraint.Version.RequiredBufferSize,
+			Comparator.Equal => constraint.Version.RequiredBufferSize + 1,
+			Comparator.GreaterThan => constraint.Version.RequiredBufferSize + 1,
+			Comparator.GreaterThanOrEqual => constraint.Version.RequiredBufferSize + 2,
+			Comparator.LessThan => constraint.Version.RequiredBufferSize + 1,
+			Comparator.LessThanOrEqual => constraint.Version.RequiredBufferSize + 2,
+			Comparator.NotEqual => constraint.Version.RequiredBufferSize + 2,
+			_ => 0
+		};
+	}
+
+	private static bool TryWriteSet(ref Span<char> destination, ref int charsWritten, VersionConstraint[] set, RangeStringFormat format)
+	{
+		AnalyzeSet(set, out var effectiveCount, out var hasExact, out var exact, out var hasLower, out var lower, out var hasUpper, out var upper, out var hasUnsupported);
+
+		if (hasUnsupported)
+		{
+			return TryWriteConstraints(ref destination, ref charsWritten, set, false);
+		}
+
+		if (effectiveCount is 0)
+		{
+			return TryWriteLiteral(ref destination, ref charsWritten, format is RangeStringFormat.Maven ? "(,)" : "*");
+		}
+
+		if (hasExact && effectiveCount is 1)
+		{
+			if (format is RangeStringFormat.Maven && !TryWriteLiteral(ref destination, ref charsWritten, "["))
+			{
+				return false;
+			}
+
+			if (!TryWriteVersion(ref destination, ref charsWritten, exact.Version))
+			{
+				return false;
+			}
+
+			return format is not RangeStringFormat.Maven || TryWriteLiteral(ref destination, ref charsWritten, "]");
+		}
+
+		if (format is RangeStringFormat.NpmShort && hasLower && hasUpper && effectiveCount is 2 && TryGetShortNpmOperator(lower, upper, out var shortOperator))
+		{
+			return TryWriteChar(ref destination, ref charsWritten, shortOperator) &&
+				   TryWriteVersion(ref destination, ref charsWritten, lower.Version);
+		}
+
+		if (format is RangeStringFormat.Maven)
+		{
+			return TryWriteMavenSet(ref destination, ref charsWritten, hasLower, lower, hasUpper, upper);
+		}
+
+		return TryWriteConstraints(ref destination, ref charsWritten, set, true);
+	}
+
+	private static bool TryWriteMavenSet(ref Span<char> destination, ref int charsWritten, bool hasLower, VersionConstraint lower, bool hasUpper, VersionConstraint upper)
+	{
+		if (!TryWriteChar(ref destination, ref charsWritten, hasLower && lower.Comparator is Comparator.GreaterThanOrEqual ? '[' : '('))
+		{
+			return false;
+		}
+
+		if (hasLower && !TryWriteVersion(ref destination, ref charsWritten, lower.Version))
+		{
+			return false;
+		}
+
+		if (!TryWriteChar(ref destination, ref charsWritten, ','))
+		{
+			return false;
+		}
+
+		if (hasUpper && !TryWriteVersion(ref destination, ref charsWritten, upper.Version))
+		{
+			return false;
+		}
+
+		return TryWriteChar(ref destination, ref charsWritten, hasUpper && upper.Comparator is Comparator.LessThanOrEqual ? ']' : ')');
+	}
+
+	private static bool TryWriteConstraints(ref Span<char> destination, ref int charsWritten, VersionConstraint[] set, bool bareEquals)
+	{
+		var written = 0;
+		foreach (var constraint in set)
+		{
+			if (constraint.Comparator is Comparator.Any)
+			{
+				continue;
+			}
+
+			if (written > 0 && !TryWriteChar(ref destination, ref charsWritten, ' '))
+			{
+				return false;
+			}
+
+			if (!TryWriteConstraint(ref destination, ref charsWritten, constraint, bareEquals))
+			{
+				return false;
+			}
+
+			written++;
+		}
+
+		return written > 0 || TryWriteLiteral(ref destination, ref charsWritten, "*");
+	}
+
+	private static bool TryWriteConstraint(ref Span<char> destination, ref int charsWritten, VersionConstraint constraint, bool bareEquals)
+	{
+		switch (constraint.Comparator)
+		{
+			case Comparator.Equal when bareEquals:
+				return TryWriteVersion(ref destination, ref charsWritten, constraint.Version);
+			case Comparator.Equal:
+				return TryWriteLiteral(ref destination, ref charsWritten, "=") &&
+					   TryWriteVersion(ref destination, ref charsWritten, constraint.Version);
+			case Comparator.GreaterThan:
+				return TryWriteLiteral(ref destination, ref charsWritten, ">") &&
+					   TryWriteVersion(ref destination, ref charsWritten, constraint.Version);
+			case Comparator.GreaterThanOrEqual:
+				return TryWriteLiteral(ref destination, ref charsWritten, ">=") &&
+					   TryWriteVersion(ref destination, ref charsWritten, constraint.Version);
+			case Comparator.LessThan:
+				return TryWriteLiteral(ref destination, ref charsWritten, "<") &&
+					   TryWriteVersion(ref destination, ref charsWritten, constraint.Version);
+			case Comparator.LessThanOrEqual:
+				return TryWriteLiteral(ref destination, ref charsWritten, "<=") &&
+					   TryWriteVersion(ref destination, ref charsWritten, constraint.Version);
+			case Comparator.NotEqual:
+				return TryWriteLiteral(ref destination, ref charsWritten, "!=") &&
+					   TryWriteVersion(ref destination, ref charsWritten, constraint.Version);
+			default:
+				return false;
+		}
+	}
+
+	private static bool TryGetShortNpmOperator(VersionConstraint lower, VersionConstraint upper, out char shortOperator)
+	{
+		if (lower.Comparator is Comparator.GreaterThanOrEqual && upper.Comparator is Comparator.LessThan)
+		{
+			if (upper.Version == GetCaretUpperBound(lower.Version))
+			{
+				shortOperator = '^';
+				return true;
+			}
+
+			if (upper.Version == GetTildeUpperBound(lower.Version))
+			{
+				shortOperator = '~';
+				return true;
+			}
+		}
+
+		shortOperator = default;
+		return false;
+	}
+
+	private static SemanticVersion GetCaretUpperBound(SemanticVersion version)
+	{
+		return version.Major > 0
+			? new SemanticVersion(version.Major + 1, 0, 0)
+			: version.Minor > 0
+				? new SemanticVersion(0, version.Minor + 1, 0)
+				: new SemanticVersion(0, 0, version.Patch + 1);
+	}
+
+	private static SemanticVersion GetTildeUpperBound(SemanticVersion version)
+	{
+		return new SemanticVersion(version.Major, version.Minor + 1, 0);
+	}
+
+	private static void AnalyzeSet(
+		VersionConstraint[] set,
+		out int effectiveCount,
+		out bool hasExact,
+		out VersionConstraint exact,
+		out bool hasLower,
+		out VersionConstraint lower,
+		out bool hasUpper,
+		out VersionConstraint upper,
+		out bool hasUnsupported)
+	{
+		effectiveCount = 0;
+		hasExact = false;
+		exact = default;
+		hasLower = false;
+		lower = default;
+		hasUpper = false;
+		upper = default;
+		hasUnsupported = false;
+
+		foreach (var constraint in set)
+		{
+			if (constraint.Comparator is Comparator.Any)
+			{
+				continue;
+			}
+
+			effectiveCount++;
+			switch (constraint.Comparator)
+			{
+				case Comparator.Equal:
+					hasExact = true;
+					exact = constraint;
+					break;
+				case Comparator.GreaterThan:
+				case Comparator.GreaterThanOrEqual:
+					hasLower = true;
+					lower = constraint;
+					break;
+				case Comparator.LessThan:
+				case Comparator.LessThanOrEqual:
+					hasUpper = true;
+					upper = constraint;
+					break;
+				default:
+					hasUnsupported = true;
+					break;
+			}
+		}
+	}
+
+	private static bool TryWriteVersion(ref Span<char> destination, ref int charsWritten, SemanticVersion version)
+	{
+		if (!version.TryFormat(destination, out var written, "f", null))
+		{
+			return false;
+		}
+
+		destination = destination[written..];
+		charsWritten += written;
+		return true;
+	}
+
+	private static bool TryWriteChar(ref Span<char> destination, ref int charsWritten, char value)
+	{
+		if (destination.IsEmpty)
+		{
+			return false;
+		}
+
+		destination[0] = value;
+		destination = destination[1..];
+		charsWritten++;
+		return true;
+	}
+
+	private static bool TryWriteLiteral(ref Span<char> destination, ref int charsWritten, ReadOnlySpan<char> value)
+	{
+		if (!value.TryCopyTo(destination))
+		{
+			return false;
+		}
+
+		destination = destination[value.Length..];
+		charsWritten += value.Length;
+		return true;
+	}
+
+	private static bool TryGetFormat(string? format, out RangeStringFormat rangeFormat)
+	{
+		return TryGetFormat(format.AsSpan(), out rangeFormat);
+	}
+
+	private static bool TryGetFormat(ReadOnlySpan<char> format, out RangeStringFormat rangeFormat)
+	{
+		if (format.IsEmpty || format is "ns")
+		{
+			rangeFormat = RangeStringFormat.NpmShort;
+			return true;
+		}
+
+		if (format is "m")
+		{
+			rangeFormat = RangeStringFormat.Maven;
+			return true;
+		}
+
+		if (format is "n")
+		{
+			rangeFormat = RangeStringFormat.Npm;
+			return true;
+		}
+
+		rangeFormat = default;
+		return false;
+	}
+}
+
+internal enum RangeStringFormat
+{
+	Maven,
+	Npm,
+	NpmShort
+}

src/semver/SemanticVersionRange.Parsing.cs

@@ -0,0 +1,502 @@
+// Copyright (c) The Geekeey Authors
+// SPDX-License-Identifier: EUPL-1.2
+
+using System.Diagnostics.CodeAnalysis;
+using System.Text;
+using System.Text.RegularExpressions;
+
+namespace Geekeey.SemVer;
+
+public readonly partial record struct SemanticVersionRange : ISpanParsable<SemanticVersionRange>
+{
+	#region IParsable
+
+	/// <summary>
+	/// Parses a string into a <see cref="SemanticVersionRange"/>.
+	/// </summary>
+	/// <see cref="Parse(string, IFormatProvider)"/>
+	public static SemanticVersionRange Parse(string s)
+	{
+		return Parse(s.AsSpan(), null);
+	}
+
+	/// <inheritdoc />
+	public static SemanticVersionRange Parse(string s, IFormatProvider? provider)
+	{
+		return Parse(s.AsSpan(), provider);
+	}
+
+	/// <summary>
+	/// Tries to parse a string into a <see cref="SemanticVersionRange"/>.
+	/// </summary>
+	/// <see cref="TryParse(string, IFormatProvider, out SemanticVersionRange)"/>
+	public static bool TryParse([NotNullWhen(true)] string? s, [MaybeNullWhen(false)] out SemanticVersionRange result)
+	{
+		return TryParse(s, null, out result);
+	}
+
+	/// <inheritdoc />
+	public static bool TryParse([NotNullWhen(true)] string? s, IFormatProvider? provider, [MaybeNullWhen(false)] out SemanticVersionRange result)
+	{
+		return TryParse(s.AsSpan(), provider, out result);
+	}
+
+	#endregion
+
+	#region ISpanParsable
+
+	/// <summary>
+	/// Parses a span of characters into a <see cref="SemanticVersionRange"/>.
+	/// </summary>
+	public static SemanticVersionRange Parse(ReadOnlySpan<char> s)
+	{
+		return Parse(s, null);
+	}
+
+	/// <inheritdoc />
+	public static SemanticVersionRange Parse(ReadOnlySpan<char> s, IFormatProvider? provider)
+	{
+		if (!TryParse(s, provider, out var range))
+		{
+			throw new FormatException($"The input string '{s}' was not in a correct format.");
+		}
+
+		return range;
+	}
+
+	/// <summary>
+	/// Tries to parse a span of characters into a <see cref="SemanticVersionRange"/>.
+	/// </summary>
+	public static bool TryParse(ReadOnlySpan<char> s, [MaybeNullWhen(false)] out SemanticVersionRange result)
+	{
+		return TryParse(s, null, out result);
+	}
+
+	/// <inheritdoc />
+	public static bool TryParse(ReadOnlySpan<char> s, IFormatProvider? provider, [MaybeNullWhen(false)] out SemanticVersionRange result)
+	{
+		result = default;
+		if (s.IsEmpty)
+		{
+			return false;
+		}
+
+		return s[0] is '[' or '(' ? TryParseJava(s, out result) : TryParseNode(s, out result);
+	}
+
+	#endregion
+
+	private static bool TryParseJava(ReadOnlySpan<char> s, out SemanticVersionRange result)
+	{
+		result = default;
+
+		var alternatives = new List<VersionConstraint[]>();
+		var start = 0;
+		var bracketLevel = 0;
+
+		for (var i = 0; i < s.Length; i++)
+		{
+			var c = s[i];
+			switch (c)
+			{
+				case '[' or '(':
+					bracketLevel++;
+					break;
+
+				case ']' or ')':
+					if (--bracketLevel < 0)
+					{
+						return false;
+					}
+					break;
+
+				case ',' when bracketLevel == 0:
+					if (!TryParseSingleMavenRange(s[start..i].Trim(), out var constraints))
+					{
+						return false;
+					}
+
+					alternatives.Add(constraints);
+					start = i + 1;
+					break;
+			}
+		}
+
+		if (bracketLevel is not 0 || !TryParseSingleMavenRange(s[start..].Trim(), out var lastConstraints))
+		{
+			return false;
+		}
+
+		alternatives.Add(lastConstraints);
+		result = new SemanticVersionRange([.. alternatives]);
+		return true;
+	}
+
+	private static bool TryParseSingleMavenRange(ReadOnlySpan<char> s, [NotNullWhen(true)] out VersionConstraint[]? constraints)
+	{
+		constraints = null;
+		if (s.IsEmpty)
+		{
+			return false;
+		}
+
+		if (s[0] is not '[' and not '(')
+		{
+			if (!TryParseVersionPartially(s, out var version, out _))
+			{
+				return false;
+			}
+
+			constraints = [new VersionConstraint(Comparator.GreaterThanOrEqual, version)];
+			return true;
+		}
+
+		var last = s.Length - 1;
+		if (s[last] is not ']' and not ')')
+		{
+			return false;
+		}
+
+		var inclusiveStart = s[0] is '[';
+		var inclusiveEnd = s[last] is ']';
+		var inner = s[1..last];
+		var commaIndex = inner.IndexOf(',');
+
+		if (commaIndex < 0)
+		{
+			if (!inclusiveStart || !inclusiveEnd || !TryParseVersionPartially(inner.Trim(), out var exactVersion, out _))
+			{
+				return false;
+			}
+
+			constraints = [new VersionConstraint(Comparator.Equal, exactVersion)];
+			return true;
+		}
+
+		var lowerText = inner[..commaIndex].Trim();
+		var upperText = inner[(commaIndex + 1)..].Trim();
+		var list = new List<VersionConstraint>(2);
+
+		if (!lowerText.IsEmpty)
+		{
+			if (!TryParseVersionPartially(lowerText, out var lowerVersion, out _))
+			{
+				return false;
+			}
+
+			list.Add(new VersionConstraint(inclusiveStart ? Comparator.GreaterThanOrEqual : Comparator.GreaterThan, lowerVersion));
+		}
+
+		if (!upperText.IsEmpty)
+		{
+			if (!TryParseVersionPartially(upperText, out var upperVersion, out _))
+			{
+				return false;
+			}
+
+			list.Add(new VersionConstraint(inclusiveEnd ? Comparator.LessThanOrEqual : Comparator.LessThan, upperVersion));
+		}
+
+		constraints = [.. list];
+		return true;
+	}
+
+	private static bool TryParseNode(ReadOnlySpan<char> s, out SemanticVersionRange result)
+	{
+		result = default;
+		var alternatives = new List<VersionConstraint[]>();
+		var start = 0;
+
+		while (start < s.Length)
+		{
+			var separator = s[start..].IndexOf("||".AsSpan());
+			var end = separator < 0 ? s.Length : start + separator;
+			var part = s[start..end].Trim();
+
+			if (!part.IsEmpty)
+			{
+				if (!TryParseNpmSet(part, out var constraints))
+				{
+					return false;
+				}
+
+				alternatives.Add(constraints);
+			}
+
+			if (separator < 0)
+			{
+				break;
+			}
+
+			start = end + 2;
+		}
+
+		result = new SemanticVersionRange([.. alternatives]);
+		return true;
+	}
+
+	private static bool TryParseNpmSet(ReadOnlySpan<char> s, [NotNullWhen(true)] out VersionConstraint[]? constraints)
+	{
+		constraints = null;
+		var hyphenIndex = s.IndexOf(" - ".AsSpan());
+		if (hyphenIndex > 0)
+		{
+			var lowerText = s[..hyphenIndex].Trim();
+			var upperText = s[(hyphenIndex + 3)..].Trim();
+			if (!SemanticVersion.TryParse(lowerText, out var lowerVersion) || !SemanticVersion.TryParse(upperText, out var upperVersion))
+			{
+				return false;
+			}
+
+			constraints =
+			[
+				new VersionConstraint(Comparator.GreaterThanOrEqual, lowerVersion),
+				new VersionConstraint(Comparator.LessThanOrEqual, upperVersion)
+			];
+			return true;
+		}
+
+		var list = new List<VersionConstraint>(2);
+		var current = s;
+		while (TryReadToken(ref current, out var token))
+		{
+			if (IsOperatorOnly(token))
+			{
+				if (!TryReadToken(ref current, out var valueToken) || !TryParseNpmConstraint(token, valueToken, list))
+				{
+					return false;
+				}
+
+				continue;
+			}
+
+			if (!TryParseNpmConstraint(default, token, list))
+			{
+				return false;
+			}
+		}
+
+		constraints = [.. list];
+		return true;
+	}
+
+	private static bool TryReadToken(ref ReadOnlySpan<char> s, out ReadOnlySpan<char> token)
+	{
+		s = s.TrimStart();
+		if (s.IsEmpty)
+		{
+			token = default;
+			return false;
+		}
+
+		var separator = s.IndexOf(' ');
+		if (separator < 0)
+		{
+			token = s;
+			s = default;
+			return true;
+		}
+
+		token = s[..separator];
+		s = s[separator..];
+		return true;
+	}
+
+	private static bool IsOperatorOnly(ReadOnlySpan<char> s)
+	{
+		return s is ">=" or "<=" or ">" or "<" or "~" or "^" or "=";
+	}
+
+	private static bool TryParseNpmConstraint(ReadOnlySpan<char> op, ReadOnlySpan<char> valueText, List<VersionConstraint> constraints)
+	{
+		if (op.IsEmpty)
+		{
+			if (valueText.StartsWith(">="))
+			{
+				op = ">=";
+				valueText = valueText[2..];
+			}
+			else if (valueText.StartsWith("<="))
+			{
+				op = "<=";
+				valueText = valueText[2..];
+			}
+			else if (valueText.StartsWith(">"))
+			{
+				op = ">";
+				valueText = valueText[1..];
+			}
+			else if (valueText.StartsWith("<"))
+			{
+				op = "<";
+				valueText = valueText[1..];
+			}
+			else if (valueText.StartsWith("^"))
+			{
+				op = "^";
+				valueText = valueText[1..];
+			}
+			else if (valueText.StartsWith("~"))
+			{
+				op = "~";
+				valueText = valueText[1..];
+			}
+			else if (valueText.StartsWith("="))
+			{
+				op = "=";
+				valueText = valueText[1..];
+			}
+		}
+
+		valueText = valueText.Trim();
+		if (IsWildcard(valueText))
+		{
+			constraints.Add(new VersionConstraint(Comparator.Any, default));
+			return true;
+		}
+
+		if (!TryParseVersionPartially(valueText, out var version, out var components))
+		{
+			return false;
+		}
+
+		switch (op)
+		{
+			case "^":
+				constraints.Add(new VersionConstraint(Comparator.GreaterThanOrEqual, version));
+				constraints.Add(new VersionConstraint(Comparator.LessThan, GetCaretUpperBound(version)));
+				return true;
+			case "~":
+				constraints.Add(new VersionConstraint(Comparator.GreaterThanOrEqual, version));
+				constraints.Add(new VersionConstraint(Comparator.LessThan, components >= 2 ? GetTildeUpperBound(version) : new SemanticVersion(version.Major + 1, 0, 0)));
+				return true;
+			case ">":
+				constraints.Add(new VersionConstraint(Comparator.GreaterThan, version));
+				return true;
+			case ">=":
+				constraints.Add(new VersionConstraint(Comparator.GreaterThanOrEqual, version));
+				return true;
+			case "<":
+				constraints.Add(new VersionConstraint(Comparator.LessThan, version));
+				return true;
+			case "<=":
+				constraints.Add(new VersionConstraint(Comparator.LessThanOrEqual, version));
+				return true;
+		}
+
+		switch (components)
+		{
+			case 3:
+				constraints.Add(new VersionConstraint(Comparator.Equal, version));
+				return true;
+			case 2:
+				constraints.Add(new VersionConstraint(Comparator.GreaterThanOrEqual, version));
+				constraints.Add(new VersionConstraint(Comparator.LessThan, new SemanticVersion(version.Major, version.Minor + 1, 0)));
+				return true;
+			case 1:
+				constraints.Add(new VersionConstraint(Comparator.GreaterThanOrEqual, version));
+				constraints.Add(new VersionConstraint(Comparator.LessThan, new SemanticVersion(version.Major + 1, 0, 0)));
+				return true;
+			default:
+				return false;
+		}
+	}
+
+	private static bool TryParseVersionPartially(ReadOnlySpan<char> s, out SemanticVersion version, out int components)
+	{
+		version = default;
+		components = 0;
+		s = s.Trim();
+		if (s.IsEmpty)
+		{
+			return false;
+		}
+
+		var core = s;
+		ReadOnlySpan<char> prerelease = default;
+		ReadOnlySpan<char> metadata = default;
+		var prereleaseIndex = s.IndexOf('-');
+		var metadataIndex = s.IndexOf('+');
+
+		if (metadataIndex >= 0)
+		{
+			core = s[..metadataIndex];
+			metadata = s[(metadataIndex + 1)..];
+		}
+
+		if (prereleaseIndex >= 0)
+		{
+			if (metadataIndex >= 0 && prereleaseIndex > metadataIndex)
+			{
+				return false;
+			}
+
+			core = s[..prereleaseIndex];
+			var prereleaseEnd = metadataIndex >= 0 ? metadataIndex : s.Length;
+			prerelease = s[(prereleaseIndex + 1)..prereleaseEnd];
+		}
+
+		ulong major = 0;
+		ulong minor = 0;
+		ulong patch = 0;
+		var segmentStart = 0;
+
+		while (segmentStart <= core.Length)
+		{
+			var nextSeparator = core[segmentStart..].IndexOf('.');
+			var segmentEnd = nextSeparator < 0 ? core.Length : segmentStart + nextSeparator;
+			var segment = core[segmentStart..segmentEnd];
+			if (segment.IsEmpty)
+			{
+				return false;
+			}
+
+			if (IsWildcard(segment))
+			{
+				version = components switch
+				{
+					1 => new SemanticVersion(major, 0, 0),
+					2 => new SemanticVersion(major, minor, 0),
+					_ => default
+				};
+				return true;
+			}
+
+			if (!ulong.TryParse(segment, out var value))
+			{
+				return false;
+			}
+
+			switch (components)
+			{
+				case 0:
+					major = value;
+					break;
+				case 1:
+					minor = value;
+					break;
+				case 2:
+					patch = value;
+					break;
+				default:
+					return false;
+			}
+
+			components++;
+			if (nextSeparator < 0)
+			{
+				break;
+			}
+
+			segmentStart = segmentEnd + 1;
+		}
+
+		version = new SemanticVersion(major, minor, patch, prerelease.IsEmpty ? null : prerelease.ToString(), metadata.IsEmpty ? null : metadata.ToString());
+		return true;
+	}
+
+	private static bool IsWildcard(ReadOnlySpan<char> s)
+	{
+		return s is "*" or "x" or "X";
+	}
+}

src/semver/SemanticVersionRange.cs

@@ -1,10 +1,7 @@
 // Copyright (c) The Geekeey Authors
 // SPDX-License-Identifier: EUPL-1.2
 
-using System.Diagnostics.CodeAnalysis;
-using System.Text;
 using System.Text.Json.Serialization;
-using System.Text.Unicode;
 
 namespace Geekeey.SemVer;
 
@@ -12,15 +9,13 @@ namespace Geekeey.SemVer;
 /// Represents a semantic version range.
 /// </summary>
 [JsonConverter(typeof(SemanticVersionRangeJsonConverter))]
-public readonly partial record struct SemanticVersionRange : ISpanParsable<SemanticVersionRange>, IUtf8SpanParsable<SemanticVersionRange>, ISpanFormattable, IUtf8SpanFormattable
+public readonly partial record struct SemanticVersionRange
 {
 	private readonly VersionConstraint[][]? _sets;
-	private readonly string? _originalString;
 
-	private SemanticVersionRange(VersionConstraint[][] sets, string originalString)
+	private SemanticVersionRange(VersionConstraint[][] sets)
 	{
 		_sets = sets;
-		_originalString = originalString;
 	}
 
 	/// <summary>
@@ -30,14 +25,25 @@ public readonly partial record struct SemanticVersionRange : ISpanParsable<Seman
 	/// <returns><c>true</c> if the version satisfies the range; otherwise, <c>false</c>.</returns>
 	public bool Satisfies(SemanticVersion version)
 	{
-		if (_sets == null || _sets.Length == 0)
+		if (_sets?.Length is null or 0)
 		{
 			return true;
 		}
 
 		foreach (var set in _sets)
 		{
-			if (IsSatisfiedBySet(set, version))
+			if (version.Prerelease is not null)
+			{
+				if (!set.Any(constraint => constraint.Version.Prerelease is not null &&
+										   constraint.Version.Major == version.Major &&
+										   constraint.Version.Minor == version.Minor &&
+										   constraint.Version.Patch == version.Patch))
+				{
+					continue;
+				}
+			}
+
+			if (set.All(constraint => constraint.Satisfies(version)))
 			{
 				return true;
 			}
@@ -46,571 +52,49 @@ public readonly partial record struct SemanticVersionRange : ISpanParsable<Seman
 		return false;
 	}
 
-	private static bool IsSatisfiedBySet(VersionConstraint[] set, SemanticVersion version)
-	{
-		if (version.Prerelease != null)
-		{
-			var hasPrereleaseMatch = false;
-			foreach (var constraint in set)
-			{
-				if (constraint.Version.Prerelease != null &&
-					constraint.Version.Major == version.Major &&
-					constraint.Version.Minor == version.Minor &&
-					constraint.Version.Patch == version.Patch)
-				{
-					hasPrereleaseMatch = true;
-					break;
-				}
-			}
-
-			if (!hasPrereleaseMatch)
-			{
-				return false;
-			}
-		}
-
-		foreach (var constraint in set)
-		{
-			if (!constraint.Satisfies(version))
-			{
-				return false;
-			}
-		}
-
-		return true;
-	}
-
 	/// <inheritdoc />
 	public override string ToString()
 	{
-		return _originalString ?? "*";
+		return ToString(null, null);
 	}
 
-	internal int RequiredBufferSize => _originalString?.Length ?? 1;
+	internal int RequiredBufferSize => GetRequiredBufferSize(RangeStringFormat.NpmShort);
 
-	#region IFormattable
+	internal readonly record struct VersionConstraint
-
-	/// <inheritdoc />
-	public string ToString(string? format, IFormatProvider? formatProvider)
 	{
-		return ToString();
+		public VersionConstraint(Comparator comparator, SemanticVersion version)
+		{
+			Comparator = comparator;
+			Version = version;
+		}
+
+		public Comparator Comparator { get; }
+		public SemanticVersion Version { get; }
+
+		public bool Satisfies(SemanticVersion version)
+		{
+			return Comparator switch
+			{
+				Comparator.Any => true,
+				Comparator.Equal => version.CompareTo(Version) is 0,
+				Comparator.NotEqual => version.CompareTo(Version) is not 0,
+				Comparator.GreaterThan => version.CompareTo(Version) > 0,
+				Comparator.GreaterThanOrEqual => version.CompareTo(Version) >= 0,
+				Comparator.LessThan => version.CompareTo(Version) < 0,
+				Comparator.LessThanOrEqual => version.CompareTo(Version) <= 0,
+				_ => false,
+			};
+		}
 	}
 
-	#endregion
+	internal enum Comparator
-
-	#region ISpanFormattable
-
-	/// <inheritdoc />
-	public bool TryFormat(Span<char> destination, out int charsWritten, ReadOnlySpan<char> format, IFormatProvider? provider)
 	{
-		var s = ToString();
+		Any,
-		if (s.Length > destination.Length)
+		Equal,
-		{
+		GreaterThan,
-			charsWritten = 0;
+		GreaterThanOrEqual,
-			return false;
+		LessThan,
-		}
+		LessThanOrEqual,
-
+		NotEqual
-		s.AsSpan().CopyTo(destination);
-		charsWritten = s.Length;
-		return true;
-	}
-
-	#endregion
-
-	#region IUtf8SpanFormattable
-
-	/// <inheritdoc />
-	public bool TryFormat(Span<byte> utf8Destination, out int bytesWritten, ReadOnlySpan<char> format, IFormatProvider? provider)
-	{
-		return Utf8.TryWrite(utf8Destination, $"{ToString()}", out bytesWritten);
-	}
-
-	#endregion
-
-	#region IParsable
-
-	/// <inheritdoc />
-	public static SemanticVersionRange Parse(string s, IFormatProvider? provider)
-	{
-		return Parse(s.AsSpan(), provider);
-	}
-
-	/// <inheritdoc />
-	public static bool TryParse([NotNullWhen(true)] string? s, IFormatProvider? provider, [MaybeNullWhen(false)] out SemanticVersionRange result)
-	{
-		return TryParse(s.AsSpan(), provider, out result);
-	}
-
-	#endregion
-
-	#region ISpanParsable
-
-	/// <summary>
-	/// Parses a span of characters into a <see cref="SemanticVersionRange"/>.
-	/// </summary>
-	public static SemanticVersionRange Parse(ReadOnlySpan<char> s)
-	{
-		return Parse(s, null);
-	}
-
-	/// <inheritdoc />
-	public static SemanticVersionRange Parse(ReadOnlySpan<char> s, IFormatProvider? provider)
-	{
-		if (!TryParse(s, provider, out var range))
-		{
-			throw new FormatException($"The input string '{s}' was not in a correct format.");
-		}
-
-		return range;
-	}
-
-	/// <summary>
-	/// Tries to parse a span of characters into a <see cref="SemanticVersionRange"/>.
-	/// </summary>
-	public static bool TryParse(ReadOnlySpan<char> s, [MaybeNullWhen(false)] out SemanticVersionRange result)
-	{
-		return TryParse(s, null, out result);
-	}
-
-	/// <inheritdoc />
-	public static bool TryParse(ReadOnlySpan<char> s, IFormatProvider? provider, [MaybeNullWhen(false)] out SemanticVersionRange result)
-	{
-		s = s.Trim();
-		if (s.IsEmpty)
-		{
-			result = new SemanticVersionRange([], "*");
-			return true;
-		}
-
-		return s[0] is '[' or '(' ? TryParseMaven(s, out result) : TryParseNpm(s, out result);
-	}
-
-	#endregion
-
-	#region IUtf8SpanParsable
-
-	/// <summary>
-	/// Parses a span of UTF-8 bytes into a <see cref="SemanticVersionRange"/>.
-	/// </summary>
-	public static SemanticVersionRange Parse(ReadOnlySpan<byte> utf8Text)
-	{
-		return Parse(utf8Text, null);
-	}
-
-	/// <inheritdoc />
-	public static SemanticVersionRange Parse(ReadOnlySpan<byte> utf8Text, IFormatProvider? provider)
-	{
-		if (!TryParse(utf8Text, provider, out var range))
-		{
-			throw new FormatException($"The input string '{Encoding.UTF8.GetString(utf8Text)}' was not in a correct format.");
-		}
-
-		return range;
-	}
-
-	/// <inheritdoc />
-	public static bool TryParse(ReadOnlySpan<byte> utf8Text, IFormatProvider? provider, [MaybeNullWhen(false)] out SemanticVersionRange result)
-	{
-		if (utf8Text.IsEmpty)
-		{
-			result = new SemanticVersionRange([], "*");
-			return true;
-		}
-
-		var charCount = Encoding.UTF8.GetCharCount(utf8Text);
-		var chars = charCount <= 256 ? stackalloc char[charCount] : new char[charCount];
-		Encoding.UTF8.GetChars(utf8Text, chars);
-
-		return TryParse(chars, provider, out result);
-	}
-
-	#endregion
-
-	private static bool TryParseMaven(ReadOnlySpan<char> s, out SemanticVersionRange result)
-	{
-		result = default;
-		var original = s.ToString();
-		var alternatives = new List<VersionConstraint[]>();
-
-		var start = 0;
-		var bracketLevel = 0;
-		for (var i = 0; i < s.Length; i++)
-		{
-			if (s[i] is '[' or '(')
-			{
-				bracketLevel++;
-			}
-			else if (s[i] is ']' or ')')
-			{
-				bracketLevel--;
-			}
-			else if (s[i] is ',' && bracketLevel == 0)
-			{
-				if (!TryParseSingleMavenRange(s[start..i].Trim(), out var constraints))
-				{
-					return false;
-				}
-
-				alternatives.Add(constraints);
-				start = i + 1;
-			}
-		}
-
-		if (!TryParseSingleMavenRange(s[start..].Trim(), out var lastConstraints))
-		{
-			return false;
-		}
-
-		alternatives.Add(lastConstraints);
-
-		result = new SemanticVersionRange([.. alternatives], original);
-		return true;
-	}
-
-	private static bool TryParseSingleMavenRange(ReadOnlySpan<char> s, [NotNullWhen(true)] out VersionConstraint[]? constraints)
-	{
-		constraints = null;
-		if (s.IsEmpty)
-		{
-			return false;
-		}
-
-		if (s[0] is not '[' and not '(')
-		{
-			if (!TryParseVersionPartially(s, out var v, out _))
-			{
-				return false;
-			}
-
-			constraints = [new VersionConstraint(Comparator.GreaterThanOrEqual, v)];
-			return true;
-		}
-
-		var last = s.Length - 1;
-		if (s[last] is not ']' and not ')')
-		{
-			return false;
-		}
-
-		var inclusiveStart = s[0] == '[';
-		var inclusiveEnd = s[last] == ']';
-		var inner = s[1..last];
-		var commaIndex = inner.IndexOf(',');
-
-		if (commaIndex < 0)
-		{
-			if (!inclusiveStart || !inclusiveEnd)
-			{
-				return false;
-			}
-
-			if (!TryParseVersionPartially(inner, out var v, out _))
-			{
-				return false;
-			}
-
-			constraints = [new VersionConstraint(Comparator.Equal, v)];
-			return true;
-		}
-
-		var startStr = inner[..commaIndex].Trim();
-		var endStr = inner[(commaIndex + 1)..].Trim();
-		var list = new List<VersionConstraint>();
-
-		if (!startStr.IsEmpty)
-		{
-			if (!TryParseVersionPartially(startStr, out var vStart, out _))
-			{
-				return false;
-			}
-
-			list.Add(new VersionConstraint(inclusiveStart ? Comparator.GreaterThanOrEqual : Comparator.GreaterThan, vStart));
-		}
-
-		if (!endStr.IsEmpty)
-		{
-			if (!TryParseVersionPartially(endStr, out var vEnd, out _))
-			{
-				return false;
-			}
-
-			list.Add(new VersionConstraint(inclusiveEnd ? Comparator.LessThanOrEqual : Comparator.LessThan, vEnd));
-		}
-
-		constraints = [.. list];
-		return true;
-	}
-
-	private static bool TryParseNpm(ReadOnlySpan<char> s, out SemanticVersionRange result)
-	{
-		result = default;
-		var original = s.ToString();
-		var alternatives = new List<VersionConstraint[]>();
-
-		var start = 0;
-		while (start < s.Length)
-		{
-			var orIndex = s[start..].IndexOf("||".AsSpan());
-			var part = orIndex < 0 ? s[start..].Trim() : s[start..(start + orIndex)].Trim();
-			start = orIndex < 0 ? s.Length : start + orIndex + 2;
-
-			if (part.IsEmpty)
-			{
-				continue;
-			}
-
-			if (!TryParseNpmSet(part, out var constraints))
-			{
-				return false;
-			}
-
-			alternatives.Add(constraints);
-		}
-
-		result = new SemanticVersionRange([.. alternatives], original);
-		return true;
-	}
-
-	private static bool TryParseNpmSet(ReadOnlySpan<char> s, [NotNullWhen(true)] out VersionConstraint[]? constraints)
-	{
-		constraints = null;
-		var list = new List<VersionConstraint>();
-
-		var hyphenIndex = s.IndexOf(" - ".AsSpan());
-		if (hyphenIndex > 0)
-		{
-			var v1Str = s[..hyphenIndex].Trim();
-			var v2Str = s[(hyphenIndex + 3)..].Trim();
-			if (!SemanticVersion.TryParse(v1Str, out var v1) || !SemanticVersion.TryParse(v2Str, out var v2))
-			{
-				return false;
-			}
-
-			constraints =
-			[
-				new VersionConstraint(Comparator.GreaterThanOrEqual, v1),
-				new VersionConstraint(Comparator.LessThanOrEqual, v2)
-			];
-			return true;
-		}
-
-		var current = s;
-		while (!current.IsEmpty)
-		{
-			current = current.TrimStart();
-			if (current.IsEmpty)
-			{
-				break;
-			}
-
-			var spaceIndex = current.IndexOf(' ');
-			var part = spaceIndex < 0 ? current : current[..spaceIndex];
-			current = spaceIndex < 0 ? default : current[spaceIndex..];
-
-			if (IsOperatorOnly(part))
-			{
-				current = current.TrimStart();
-				var nextSpace = current.IndexOf(' ');
-				var nextPart = nextSpace < 0 ? current : current[..nextSpace];
-				current = nextSpace < 0 ? default : current[nextSpace..];
-
-				if (!TryParseNpmConstraint(part, nextPart, list))
-				{
-					return false;
-				}
-			}
-			else
-			{
-				if (!TryParseNpmConstraint(default, part, list))
-				{
-					return false;
-				}
-			}
-		}
-
-		constraints = [.. list];
-		return true;
-	}
-
-	private static bool IsOperatorOnly(ReadOnlySpan<char> s)
-	{
-		return s is ">=" or "<=" or ">" or "<" or "~" or "^" or "=";
-	}
-
-	private static bool TryParseNpmConstraint(ReadOnlySpan<char> op, ReadOnlySpan<char> vStr, List<VersionConstraint> constraints)
-	{
-		if (op.IsEmpty)
-		{
-			if (vStr.StartsWith(">="))
-			{
-				op = ">=";
-				vStr = vStr[2..];
-			}
-			else if (vStr.StartsWith("<="))
-			{
-				op = "<=";
-				vStr = vStr[2..];
-			}
-			else if (vStr.StartsWith(">"))
-			{
-				op = ">";
-				vStr = vStr[1..];
-			}
-			else if (vStr.StartsWith("<"))
-			{
-				op = "<";
-				vStr = vStr[1..];
-			}
-			else if (vStr.StartsWith("^"))
-			{
-				op = "^";
-				vStr = vStr[1..];
-			}
-			else if (vStr.StartsWith("~"))
-			{
-				op = "~";
-				vStr = vStr[1..];
-			}
-			else if (vStr.StartsWith("="))
-			{
-				op = "=";
-				vStr = vStr[1..];
-			}
-		}
-
-		vStr = vStr.Trim();
-		if (vStr is "*" or "x" or "X")
-		{
-			constraints.Add(new VersionConstraint(Comparator.Any, default));
-			return true;
-		}
-
-		if (!TryParseVersionPartially(vStr, out var v, out var components))
-		{
-			return false;
-		}
-
-		if (op is "^")
-		{
-			constraints.Add(new VersionConstraint(Comparator.GreaterThanOrEqual, v));
-			var endV = v.Major > 0 ? new SemanticVersion(v.Major + 1, 0, 0) : (v.Minor > 0 ? new SemanticVersion(0, v.Minor + 1, 0) : new SemanticVersion(0, 0, v.Patch + 1));
-			constraints.Add(new VersionConstraint(Comparator.LessThan, endV));
-		}
-		else if (op is "~")
-		{
-			constraints.Add(new VersionConstraint(Comparator.GreaterThanOrEqual, v));
-			var endV = components >= 2 ? new SemanticVersion(v.Major, v.Minor + 1, 0) : new SemanticVersion(v.Major + 1, 0, 0);
-			constraints.Add(new VersionConstraint(Comparator.LessThan, endV));
-		}
-		else if (op is ">") constraints.Add(new VersionConstraint(Comparator.GreaterThan, v));
-		else if (op is ">=") constraints.Add(new VersionConstraint(Comparator.GreaterThanOrEqual, v));
-		else if (op is "<") constraints.Add(new VersionConstraint(Comparator.LessThan, v));
-		else if (op is "<=") constraints.Add(new VersionConstraint(Comparator.LessThanOrEqual, v));
-		else
-		{
-			if (components == 3)
-			{
-				constraints.Add(new VersionConstraint(Comparator.Equal, v));
-			}
-			else if (components == 2)
-			{
-				constraints.Add(new VersionConstraint(Comparator.GreaterThanOrEqual, v));
-				constraints.Add(new VersionConstraint(Comparator.LessThan, new SemanticVersion(v.Major, v.Minor + 1, 0)));
-			}
-			else if (components == 1)
-			{
-				constraints.Add(new VersionConstraint(Comparator.GreaterThanOrEqual, v));
-				constraints.Add(new VersionConstraint(Comparator.LessThan, new SemanticVersion(v.Major + 1, 0, 0)));
-			}
-		}
-
-		return true;
-	}
-
-	private static bool TryParseVersionPartially(ReadOnlySpan<char> s, out SemanticVersion version, out int components)
-	{
-		version = default;
-		components = 0;
-
-		var dashIndex = s.IndexOf('-');
-		var metadataIndex = s.IndexOf('+');
-		var suffixIndex = dashIndex >= 0 ? (metadataIndex >= 0 ? Math.Min(dashIndex, metadataIndex) : dashIndex) : metadataIndex;
-
-		var versionPart = suffixIndex >= 0 ? s[..suffixIndex] : s;
-		var prerelease = dashIndex >= 0 ? (metadataIndex > dashIndex ? s[(dashIndex + 1)..metadataIndex].ToString() : s[(dashIndex + 1)..].ToString()) : null;
-		var metadata = metadataIndex >= 0 ? s[(metadataIndex + 1)..].ToString() : null;
-
-		ulong major = 0, minor = 0, patch = 0;
-		var current = versionPart;
-		var componentCount = 0;
-
-		while (!current.IsEmpty && componentCount < 3)
-		{
-			var dotIndex = current.IndexOf('.');
-			var part = dotIndex < 0 ? current : current[..dotIndex];
-
-			if (part is "*" or "x" or "X")
-			{
-				components = componentCount;
-				version = componentCount switch
-				{
-					1 => new SemanticVersion(major, 0, 0),
-					2 => new SemanticVersion(major, minor, 0),
-					_ => default
-				};
-				return true;
-			}
-
-			if (!ulong.TryParse(part, out var value))
-			{
-				return false;
-			}
-
-			if (componentCount == 0) major = value;
-			else if (componentCount == 1) minor = value;
-			else if (componentCount == 2) patch = value;
-
-			componentCount++;
-			if (dotIndex < 0) break;
-			current = current[(dotIndex + 1)..];
-		}
-
-		components = componentCount;
-		version = new SemanticVersion(major, minor, patch, prerelease, metadata);
-		return true;
-	}
-}
-
-internal enum Comparator
-{
-	Any,
-	Equal,
-	GreaterThan,
-	GreaterThanOrEqual,
-	LessThan,
-	LessThanOrEqual,
-	NotEqual
-}
-
-internal readonly record struct VersionConstraint(Comparator Comparator, SemanticVersion Version)
-{
-	public bool Satisfies(SemanticVersion version)
-	{
-		if (Comparator is Comparator.Any)
-		{
-			return true;
-		}
-
-		var cmp = version.CompareTo(Version);
-		return Comparator switch
-		{
-			Comparator.Equal => cmp == 0,
-			Comparator.NotEqual => cmp != 0,
-			Comparator.GreaterThan => cmp > 0,
-			Comparator.GreaterThanOrEqual => cmp >= 0,
-			Comparator.LessThan => cmp < 0,
-			Comparator.LessThanOrEqual => cmp <= 0,
-			_ => false
-		};
 	}
 }

src/semver/SemanticVersionRangeJsonConverter.cs

@@ -1,6 +1,7 @@
 // Copyright (c) The Geekeey Authors
 // SPDX-License-Identifier: EUPL-1.2
 
+using System.Buffers;
 using System.Text.Json;
 using System.Text.Json.Serialization;
 
@@ -8,6 +9,8 @@ namespace Geekeey.SemVer;
 
 internal sealed class SemanticVersionRangeJsonConverter : JsonConverter<SemanticVersionRange>
 {
+	private const int StackBufferThreshold = 256;
+
 	public override SemanticVersionRange Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options)
 	{
 		if (reader.TokenType is JsonTokenType.Null)
@@ -22,16 +25,35 @@ internal sealed class SemanticVersionRangeJsonConverter : JsonConverter<Semantic
 
 		try
 		{
-			return SemanticVersionRange.Parse(reader.ValueSpan);
+			return SemanticVersionRange.Parse(reader.GetString().AsSpan());
 		}
-		catch (FormatException e)
+		catch (FormatException exception)
 		{
-			throw new JsonException(e.Message, e);
+			throw new JsonException(exception.Message, exception);
 		}
 	}
 
 	public override void Write(Utf8JsonWriter writer, SemanticVersionRange value, JsonSerializerOptions options)
 	{
-		writer.WriteStringValue(value.ToString());
+		var capacity = value.RequiredBufferSize;
+		var shared = capacity > StackBufferThreshold ? ArrayPool<char>.Shared.Rent(capacity) : null;
+		try
+		{
+			scoped var buffer = shared.AsSpan();
+			if (shared is null)
+			{
+				buffer = stackalloc char[capacity];
+			}
+
+			_ = value.TryFormat(buffer, out var bytesWritten, default, null);
+			writer.WriteStringValue(buffer[..bytesWritten]);
+		}
+		finally
+		{
+			if (shared is not null)
+			{
+				ArrayPool<char>.Shared.Return(shared);
+			}
+		}
 	}
 }