SemverType.cs

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using System;
 
using HotChocolate.Language;
using HotChocolate.Types;
using Tgstation.Server.Common.Extensions;
 
namespace Tgstation.Server.Host.GraphQL.Scalars
{
    public sealed class SemverType : ScalarType<Version, StringValueNode>
    {
        public SemverType()
            : base("Semver")
        {
            Description = "Represents a version in semantic versioning format";
            SpecifiedBy = new Uri("https://semver.org/spec/v2.0.0.html");
        }
 
        public override IValueNode ParseResult(object? resultValue)
            => ParseValue(resultValue);
 
        public override bool TryDeserialize(object? resultValue, out object? runtimeValue)
        {
            if (resultValue is not string resultString)
            {
                runtimeValue = null;
                return false;
            }
 
            var result = Version.TryParse(resultString, out var resultVersion);
            runtimeValue = resultVersion;
            return result;
        }
 
        public override bool TrySerialize(object? runtimeValue, out object? resultValue)
        {
            if (runtimeValue is not Version runtimeVersion)
            {
                resultValue = null;
                return false;
            }
 
            resultValue = runtimeVersion.Semver().ToString();
            return true;
        }
 
        protected override Version ParseLiteral(StringValueNode valueSyntax)
        {
            ArgumentNullException.ThrowIfNull(valueSyntax);
            return Version.Parse(valueSyntax.Value);
        }
 
        protected override StringValueNode ParseValue(Version runtimeValue)
            => new(runtimeValue.Semver().ToString());
 
        protected override bool IsInstanceOfType(StringValueNode valueSyntax)
        {
            ArgumentNullException.ThrowIfNull(valueSyntax);
            return Version.TryParse(valueSyntax.Value, out var parsedVersion)
                && IsInstanceOfType(parsedVersion);
        }
 
        protected override bool IsInstanceOfType(Version runtimeValue)
        {
            ArgumentNullException.ThrowIfNull(runtimeValue);
            return runtimeValue.Build != -1 && runtimeValue.Revision == -1;
        }
    }
}