[codex] Add InlineArray parser generation

[dameng324]

Summary

• Add source-generator support for [InlineArray] repeated fields, including generic inline arrays.
• Generate nested per-member InlineArray readers and writers that implement collection parser interfaces.
• Make collection parser interface members public so generated parsers in consumer assemblies can implement them.
• Add regression coverage for non-generic and generic InlineArray types, including custom struct item types.

Validation

• dotnet test tests\LightProto.Tests\LightProto.Tests.csproj --no-build -c Debug -f net10.0
• dotnet build tests\LightProto.Tests\LightProto.Tests.csproj --no-restore -c Release -f net8.0
• dotnet build tests\LightProto.Tests\LightProto.Tests.csproj --no-restore -c Release -f net10.0
• dotnet build src\LightProto\LightProto.csproj --no-restore -c Release -f netstandard2.0
• dotnet tool run csharpier -- check src\LightProto.Generator src\LightProto\Parser\IEnumerableReader.cs src\LightProto\Parser\IEnumerableWriter.cs tests\LightProto.Tests\Parsers\InlineArray.cs

Release builds still show existing IL2067 warnings in NonGenericSerializerTests, unrelated to this change.

[codacy-production]

Up to standards ✅

🟢 Issues 0 issues

Results:
0 new issues

View in Codacy

🟢 Metrics 39 complexity · 2 duplication

Metric	Results
Complexity	39
Duplication	2

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.67%. Comparing base (599aeb9) to head (f9d4912).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #198   +/-   ##
=======================================
  Coverage   95.67%   95.67%           
=======================================
  Files         124      124           
  Lines        3287     3287           
  Branches      441      441           
=======================================
  Hits         3145     3145           
  Misses         76       76           
  Partials       66       66           

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[github-actions]

BenchmarkDotNet v0.15.8, Linux Ubuntu 24.04.4 LTS (Noble Numbat)
AMD EPYC 7763 2.45GHz, 1 CPU, 4 logical and 2 physical cores
.NET SDK 10.0.301
  [Host]    : .NET 8.0.28 (8.0.28, 8.0.2826.26413), X64 RyuJIT x86-64-v3
  .NET 10.0 : .NET 10.0.9 (10.0.9, 10.0.926.27113), X64 RyuJIT x86-64-v3
  .NET 8.0  : .NET 8.0.28 (8.0.28, 8.0.2826.26413), X64 RyuJIT x86-64-v3
  .NET 9.0  : .NET 9.0.17 (9.0.17, 9.0.1726.26416), X64 RyuJIT x86-64-v3

Method	Job	Runtime	Mean	Error	StdDev	Ratio	Allocated	Alloc Ratio
Deserialize_ProtoBuf_net	.NET 10.0	.NET 10.0	765.7 μs	1.77 μs	1.66 μs	1.22	562 KB	0.98
Deserialize_GoogleProtoBuf	.NET 10.0	.NET 10.0	612.1 μs	2.68 μs	2.37 μs	0.98	648.7 KB	1.13
Deserialize_LightProto	.NET 10.0	.NET 10.0	626.4 μs	2.98 μs	2.78 μs	1.00	574.8 KB	1.00
Deserialize_ProtoBuf_net	.NET 8.0	.NET 8.0	903.2 μs	2.02 μs	1.79 μs	1.45	562 KB	0.98
Deserialize_GoogleProtoBuf	.NET 8.0	.NET 8.0	821.9 μs	2.90 μs	2.71 μs	1.32	648.7 KB	1.13
Deserialize_LightProto	.NET 8.0	.NET 8.0	623.7 μs	3.07 μs	2.57 μs	1.00	574.8 KB	1.00
Deserialize_ProtoBuf_net	.NET 9.0	.NET 9.0	811.8 μs	2.71 μs	2.53 μs	1.31	562 KB	0.98
Deserialize_GoogleProtoBuf	.NET 9.0	.NET 9.0	710.7 μs	3.10 μs	2.90 μs	1.15	648.7 KB	1.13
Deserialize_LightProto	.NET 9.0	.NET 9.0	620.4 μs	3.43 μs	3.04 μs	1.00	574.8 KB	1.00

BenchmarkDotNet v0.15.8, Linux Ubuntu 24.04.4 LTS (Noble Numbat)
AMD EPYC 7763 2.45GHz, 1 CPU, 4 logical and 2 physical cores
.NET SDK 10.0.301
  [Host]    : .NET 8.0.28 (8.0.28, 8.0.2826.26413), X64 RyuJIT x86-64-v3
  .NET 10.0 : .NET 10.0.9 (10.0.9, 10.0.926.27113), X64 RyuJIT x86-64-v3
  .NET 8.0  : .NET 8.0.28 (8.0.28, 8.0.2826.26413), X64 RyuJIT x86-64-v3
  .NET 9.0  : .NET 9.0.17 (9.0.17, 9.0.1726.26416), X64 RyuJIT x86-64-v3

Method	Job	Runtime	Mean	Error	StdDev	Ratio	Allocated	Alloc Ratio
Serialize_ProtoBuf_net	.NET 10.0	.NET 10.0	925.3 μs	8.22 μs	7.69 μs	1.30	526.41 KB	1.03
Serialize_GoogleProtoBuf	.NET 10.0	.NET 10.0	790.2 μs	4.54 μs	4.25 μs	1.11	512.95 KB	1.00
Serialize_LightProto	.NET 10.0	.NET 10.0	709.1 μs	3.79 μs	3.36 μs	1.00	512.92 KB	1.00
Serialize_ProtoBuf_net	.NET 8.0	.NET 8.0	1,049.2 μs	7.56 μs	7.07 μs	1.32	526.4 KB	1.03
Serialize_GoogleProtoBuf	.NET 8.0	.NET 8.0	812.6 μs	9.09 μs	8.51 μs	1.02	512.95 KB	1.00
Serialize_LightProto	.NET 8.0	.NET 8.0	793.7 μs	4.04 μs	3.59 μs	1.00	512.92 KB	1.00
Serialize_ProtoBuf_net	.NET 9.0	.NET 9.0	1,098.5 μs	11.09 μs	10.37 μs	1.39	526.4 KB	1.03
Serialize_GoogleProtoBuf	.NET 9.0	.NET 9.0	796.7 μs	2.85 μs	2.38 μs	1.01	512.95 KB	1.00
Serialize_LightProto	.NET 9.0	.NET 9.0	787.5 μs	3.87 μs	3.23 μs	1.00	512.92 KB	1.00