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Remove unreachable branches from JsonConverters

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* If the type is a reference type we don't have to handle null ourselves
* reader.ValueSpan is only valid if reader.HasValueSequence is false
This commit is contained in:
Bond_009 2021-12-19 02:17:32 +01:00
parent 923720c988
commit ea9fc9f9cc
5 changed files with 25 additions and 45 deletions
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8
src/Jellyfin.Extensions/Json/Converters/JsonDelimitedArrayConverter.cs
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@ -9,7 +9,7 @@ namespace Jellyfin.Extensions.Json.Converters
/// Convert delimited string to array of type.
/// </summary>
/// <typeparam name="T">Type to convert to.</typeparam>
public abstract class JsonDelimitedArrayConverter<T> : JsonConverter<T[]?>
public abstract class JsonDelimitedArrayConverter<T> : JsonConverter<T[]>
{
private readonly TypeConverter _typeConverter;
@ -31,9 +31,9 @@ namespace Jellyfin.Extensions.Json.Converters
{
if (reader.TokenType == JsonTokenType.String)
{
// GetString can't return null here because we already handled it above
var stringEntries = reader.GetString()?.Split(Delimiter, StringSplitOptions.RemoveEmptyEntries);
if (stringEntries == null || stringEntries.Length == 0)
// null got handled higher up the call stack
var stringEntries = reader.GetString()!.Split(Delimiter, StringSplitOptions.RemoveEmptyEntries);
if (stringEntries.Length == 0)
{
return Array.Empty<T>();
}

18
src/Jellyfin.Extensions/Json/Converters/JsonGuidConverter.cs
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@ -12,15 +12,19 @@ namespace Jellyfin.Extensions.Json.Converters
{
/// <inheritdoc />
public override Guid Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options)
{
var guidStr = reader.GetString();
return guidStr == null ? Guid.Empty : new Guid(guidStr);
}
=> reader.TokenType == JsonTokenType.Null
? Guid.Empty
: ReadInternal(ref reader);
// TODO: optimize by parsing the UTF8 bytes instead of converting to string first
internal static Guid ReadInternal(ref Utf8JsonReader reader)
=> Guid.Parse(reader.GetString()!); // null got handled higher up the call stack
/// <inheritdoc />
public override void Write(Utf8JsonWriter writer, Guid value, JsonSerializerOptions options)
{
writer.WriteStringValue(value.ToString("N", CultureInfo.InvariantCulture));
}
=> WriteInternal(writer, value);
internal static void WriteInternal(Utf8JsonWriter writer, Guid value)
=> writer.WriteStringValue(value.ToString("N", CultureInfo.InvariantCulture));
}
}

11
src/Jellyfin.Extensions/Json/Converters/JsonNullableGuidConverter.cs
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@ -1,5 +1,4 @@
using System;
using System.Globalization;
using System.Text.Json;
using System.Text.Json.Serialization;
@ -12,21 +11,19 @@ namespace Jellyfin.Extensions.Json.Converters
{
/// <inheritdoc />
public override Guid? Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options)
{
var guidStr = reader.GetString();
return guidStr == null ? null : new Guid(guidStr);
}
=> JsonGuidConverter.ReadInternal(ref reader);
/// <inheritdoc />
public override void Write(Utf8JsonWriter writer, Guid? value, JsonSerializerOptions options)
{
if (value == null || value == Guid.Empty)
if (value == Guid.Empty)
{
writer.WriteNullValue();
}
else
{
writer.WriteStringValue(value.Value.ToString("N", CultureInfo.InvariantCulture));
// null got handled higher up the call stack
JsonGuidConverter.WriteInternal(writer, value!.Value);
}
}
}

20
src/Jellyfin.Extensions/Json/Converters/JsonNullableStructConverter.cs
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@ -15,13 +15,10 @@ namespace Jellyfin.Extensions.Json.Converters
/// <inheritdoc />
public override TStruct? Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options)
{
if (reader.TokenType == JsonTokenType.Null)
{
return null;
}
// Token is empty string.
if (reader.TokenType == JsonTokenType.String && ((reader.HasValueSequence && reader.ValueSequence.IsEmpty) || reader.ValueSpan.IsEmpty))
if (reader.TokenType == JsonTokenType.String
&& ((reader.HasValueSequence && reader.ValueSequence.IsEmpty)
|| (!reader.HasValueSequence && reader.ValueSpan.IsEmpty)))
{
return null;
}
@ -31,15 +28,6 @@ namespace Jellyfin.Extensions.Json.Converters
/// <inheritdoc />
public override void Write(Utf8JsonWriter writer, TStruct? value, JsonSerializerOptions options)
{
if (value.HasValue)
{
JsonSerializer.Serialize(writer, value.Value, options);
}
else
{
writer.WriteNullValue();
}
}
=> JsonSerializer.Serialize(writer, value!.Value, options); // null got handled higher up the call stack
}
}

13
src/Jellyfin.Extensions/Json/Converters/JsonStringConverter.cs
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@ -13,20 +13,11 @@ namespace Jellyfin.Extensions.Json.Converters
{
/// <inheritdoc />
public override string? Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options)
{
return reader.TokenType switch
{
JsonTokenType.Null => null,
JsonTokenType.String => reader.GetString(),
_ => GetRawValue(reader)
};
}
=> reader.TokenType == JsonTokenType.String ? reader.GetString() : GetRawValue(reader);
/// <inheritdoc />
public override void Write(Utf8JsonWriter writer, string? value, JsonSerializerOptions options)
{
writer.WriteStringValue(value);
}
=> writer.WriteStringValue(value);
private static string GetRawValue(Utf8JsonReader reader)
{