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Initial development on a data generation tool + analyzer for detecting misuse of ContentManagers
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‎src/SMAPI.ModBuildConfig.Analyzer.DataGeneration/Program.cs‎

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using System.Text.Json;
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using Mono.Cecil;
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using Mono.Cecil.Cil;
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using Mono.Collections.Generic;
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using StardewModdingAPI.ModBuildConfig.Analyzer;
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using StardewModdingAPI.Toolkit;
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Console.WriteLine("Hello, World!");
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var stardew = AssemblyDefinition.ReadAssembly("Stardew Valley.dll");
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Dictionary<string, string> AssetMap = new Dictionary<string, string>();
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List<string> messagesForLater = new();
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foreach (var module in stardew.Modules)
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{
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var types = module.GetTypes().Where(type => type.BaseType != null);
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foreach (var type in types)
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{
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foreach (var method in type.Methods)
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{
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if (method.HasBody)
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{
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ILProcessor cil = method.Body.GetILProcessor();
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Collection<Instruction> instructions = cil.Body.Instructions;
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Instruction prevInstruction = Instruction.Create(OpCodes.Nop);
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foreach (var instruction in instructions)
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{
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if (instruction.OpCode.Code == Code.Nop)
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continue;
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if (instruction.OpCode == OpCodes.Call || instruction.OpCode == OpCodes.Callvirt || instruction.OpCode == OpCodes.Newobj)
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{
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var methodInstruction = (MethodReference)instruction.Operand;
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if (methodInstruction.Name == "Load") {
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if (methodInstruction.DeclaringType.FullName != "StardewValley.LocalizedContentManager")
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{
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Console.WriteLine("Found a Load that was not StardewValley.LocalizedContentManager " + method.DeclaringType.FullName);
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continue;
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}
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var genericMethod = (GenericInstanceMethod)methodInstruction;
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string genericParameter = genericMethod.GenericArguments[0]?.FullName ?? "<unknown>";
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string? assetName = null;
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if (prevInstruction.OpCode == OpCodes.Ldstr)
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{
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assetName = (string)prevInstruction.Operand;
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}
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else
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{
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messagesForLater.Add($"{method.FullName} is calling Load {methodInstruction} (prev instruction: {prevInstruction})");
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}
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if (assetName != null)
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{
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if (AssetMap.TryGetValue(assetName, out string existingType))
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{
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if (genericParameter != existingType)
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{
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Console.WriteLine($"Found a new use of {assetName}: Previously {existingType} now {genericParameter}");
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}
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}
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else
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{
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AssetMap[assetName] = genericParameter;
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}
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}
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}
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}
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prevInstruction = instruction;
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}
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}
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}
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}
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}
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Directory.CreateDirectory("outputs");
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var currentVersion = new SemanticVersion(stardew.Name.Version);
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HashSet<string> missingAssets = new();
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foreach (string file in Directory.GetFiles("outputs"))
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{
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if (file.EndsWith(stardew.Name.Version + ".json")) continue;
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var otherVersion = new SemanticVersion(Path.GetFileNameWithoutExtension(file), true);
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if (otherVersion.IsNewerThan(currentVersion)) continue;
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try
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{
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var versionInfo = JsonSerializer.Deserialize<VersionModel>(File.ReadAllText(file));
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foreach (var (asset, type) in versionInfo.AssetMap)
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{
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if (!AssetMap.ContainsKey(asset))
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{
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missingAssets.Add(asset);
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}
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}
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}
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catch { }
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}
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string jsonOutput = JsonSerializer.Serialize(new VersionModel(AssetMap, missingAssets), new JsonSerializerOptions
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{
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WriteIndented = true,
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});
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File.WriteAllText($"outputs/{stardew.Name.Version}.json", jsonOutput);
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‎src/SMAPI.ModBuildConfig.Analyzer.DataGeneration/SMAPI.ModBuildConfig.Analyzer.DataGeneration.csproj‎

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<Project Sdk="Microsoft.NET.Sdk">
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<PropertyGroup>
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<OutputType>Exe</OutputType>
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<TargetFramework>net6.0</TargetFramework>
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<ImplicitUsings>enable</ImplicitUsings>
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<Nullable>enable</Nullable>
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</PropertyGroup>
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<Import Project="..\..\build\common.targets" />
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<ItemGroup>
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<PackageReference Include="Mono.Cecil" Version="0.11.5" />
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<ProjectReference Include="..\SMAPI.ModBuildConfig.Analyzer\SMAPI.ModBuildConfig.Analyzer.csproj" />
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<ProjectReference Include="..\SMAPI.Toolkit\SMAPI.Toolkit.csproj" />
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<Reference Include="Stardew Valley" HintPath="$(GamePath)\Stardew Valley.dll" Private="False" />
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<Reference Include="StardewValley.GameData" HintPath="$(GamePath)\StardewValley.GameData.dll" Private="False" />
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</ItemGroup>
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<Target Name="CopyStardew" AfterTargets="AfterBuild">
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<Copy SourceFiles="$(GamePath)\Stardew Valley.dll" DestinationFolder="$(TargetDir)" />
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<Copy SourceFiles="$(GamePath)\StardewValley.Gamedata.dll" DestinationFolder="$(TargetDir)" />
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</Target>
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</Project>

‎src/SMAPI.ModBuildConfig.Analyzer.Tests/ContentManagerAnalyzerTests.cs‎

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using Microsoft.CodeAnalysis;
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using Microsoft.CodeAnalysis.Diagnostics;
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using NUnit.Framework;
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using SMAPI.ModBuildConfig.Analyzer.Tests.Framework;
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using StardewModdingAPI.ModBuildConfig.Analyzer;
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namespace SMAPI.ModBuildConfig.Analyzer.Tests
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{
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/// <summary>Unit tests for <see cref="ContentManagerAnalyzer"/>.</summary>
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[TestFixture]
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public class ContentManagerAnalyzerTests : DiagnosticVerifier
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{
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/*********
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** Fields
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*********/
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/// <summary>Sample C# mod code, with a {{test-code}} placeholder for the code in the Entry method to test.</summary>
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const string SampleProgram = @"
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using System;
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using System.Collections.Generic;
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using StardewValley;
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using Netcode;
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using SObject = StardewValley.Object;
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namespace SampleMod
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{
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class ModEntry
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{
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public void Entry()
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{
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{{test-code}}
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}
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}
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}
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";
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/// <summary>The line number where the unit tested code is injected into <see cref="SampleProgram"/>.</summary>
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private const int SampleCodeLine = 14;
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/// <summary>The column number where the unit tested code is injected into <see cref="SampleProgram"/>.</summary>
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private const int SampleCodeColumn = 25;
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/*********
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** Unit tests
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*********/
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/// <summary>Test that no diagnostics are raised for an empty code block.</summary>
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[TestCase]
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public void EmptyCode_HasNoDiagnostics()
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{
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// arrange
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string test = @"";
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// assert
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this.VerifyCSharpDiagnostic(test);
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}
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/// <summary>Test that the expected diagnostic message is raised for avoidable net field references.</summary>
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/// <param name="codeText">The code line to test.</param>
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/// <param name="column">The column within the code line where the diagnostic message should be reported.</param>
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/// <param name="expression">The expression which should be reported.</param>
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/// <param name="netType">The net type name which should be reported.</param>
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/// <param name="suggestedProperty">The suggested property name which should be reported.</param>
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[TestCase("Game1.content.Load<Dictionary<int, string>>(\"Data\\\\Fish\");", 0, "Data\\Fish", "System.Collections.Generic.Dictionary<System.Int32, System.String>", "System.Collections.Generic.Dictionary<System.String,System.String>")]
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public void BadType_RaisesDiagnostic(string codeText, int column, string assetName, string expectedType, string suggestedType)
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{
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// arrange
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string code = SampleProgram.Replace("{{test-code}}", codeText);
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DiagnosticResult expected = new()
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{
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Id = "AvoidContentManagerBadType",
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Message = $"'{assetName}' uses the {suggestedType} type, but {expectedType} is in use instead. See https://smapi.io/package/avoid-contentmanager-type for details.",
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Severity = DiagnosticSeverity.Error,
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Locations = new[] { new DiagnosticResultLocation("Test0.cs", SampleCodeLine, SampleCodeColumn + column) }
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};
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// assert
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this.VerifyCSharpDiagnostic(code, expected);
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}
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/*********
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** Helpers
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*********/
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/// <summary>Get the analyzer being tested.</summary>
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protected override DiagnosticAnalyzer GetCSharpDiagnosticAnalyzer()
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{
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return new ContentManagerAnalyzer();
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}
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}
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}

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