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54 lines
1.4 KiB
54 lines
1.4 KiB
using Recyclarr.Common.Extensions;
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using YamlDotNet.Core;
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using YamlDotNet.Core.Events;
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using YamlDotNet.Serialization;
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namespace Recyclarr.Yaml.YamlDotNet;
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// Borrowed from: https://github.com/aaubry/YamlDotNet/issues/443#issuecomment-544449498
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public sealed class ForceEmptySequences(IObjectFactory objectFactory) : INodeDeserializer
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{
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bool INodeDeserializer.Deserialize(
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IParser reader,
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Type expectedType,
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Func<IParser, Type, object?> nestedObjectDeserializer,
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out object? value)
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{
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value = null;
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if (!IsList(expectedType) || !reader.Accept<NodeEvent>(out var evt) || !NodeIsNull(evt))
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{
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return false;
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}
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reader.SkipThisAndNestedEvents();
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value = objectFactory.Create(expectedType);
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return true;
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}
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private static bool NodeIsNull(NodeEvent nodeEvent)
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{
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// http://yaml.org/type/null.html
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if (nodeEvent.Tag == "tag:yaml.org,2002:null")
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{
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return true;
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}
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if (nodeEvent is not Scalar {Style: ScalarStyle.Plain} scalar)
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{
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return false;
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}
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var value = scalar.Value;
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return value is "" or "~" or "null" or "Null" or "NULL";
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}
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private static bool IsList(Type type)
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{
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return
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type.IsImplementationOf(typeof(ICollection<>)) ||
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type.IsImplementationOf(typeof(IReadOnlyCollection<>));
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}
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}
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