public static string Generate(JsonType type)
{
return($@"
using System;
using System.Buffers;
using System.Text.Json;
using System.Runtime.InteropServices;
namespace {type.Namespace}
{{
[StructLayout(LayoutKind.Auto)]
{type.Accesibility} readonly ref partial struct {type.TypeName}
{{
public readonly bool HasValue {{ get; }}
public {type.TypeName}(ReadOnlySpan<byte> jsonData) : this(new Utf8JsonReader(jsonData, new JsonReaderOptions {{ CommentHandling = JsonCommentHandling.Skip }}))
{{}}
public {type.TypeName}(ReadOnlySequence<byte> jsonData) : this(new Utf8JsonReader(jsonData, new JsonReaderOptions {{ CommentHandling = JsonCommentHandling.Skip }}))
{{}}
private {type.TypeName}(Utf8JsonReader jsonReader) : this(ref jsonReader)
{{}}
public {type.TypeName}(ref Utf8JsonReader jsonReader)
{{
{CodeGenetaionHelper.Indent(3, GenerateConstructor(type))}
}}
}}
}}
");
}
private static string GenerateConstructor(JsonType type)
{
return($@"
{GenerateFieldInitializers(type)}
if (jsonReader.TokenType != JsonTokenType.StartObject && jsonReader.TokenType != JsonTokenType.Null) jsonReader.Read();
switch (jsonReader.TokenType)
{{
case JsonTokenType.StartObject:
HasValue = true;
jsonReader.Read();
while (jsonReader.TokenType != JsonTokenType.EndObject)
{{
if (jsonReader.TokenType != JsonTokenType.PropertyName) throw new JsonException($""Expected property name or '}}}}', but got {{jsonReader.TokenType}}"");
{CodeGenetaionHelper.Indent(1, GenerateFieldDeserializers(type))}
else
{{
jsonReader.Skip();
}}
jsonReader.Read();
}}
break;
case JsonTokenType.Null:
HasValue = false;
break;
default:
throw new JsonException($""Expected '{{{{', but got {{jsonReader.TokenType}}"");
}}
");
}
private static string GenerateFieldDeserializers(JsonType type)
{
return(CodeGenetaionHelper.JoinLines("else ", type.Fields.Select(GenerateFieldDeserializer)));
}