mirror of
https://gitlab.com/Kwoth/nadekobot.git
synced 2025-09-11 09:48:26 -04:00
Enabled Nullable reference types. Added a temporary fix for clonable NRT warnings.
This commit is contained in:
Kwoth
261
src/NadekoBot.Generators/Cloneable/CloneableGenerator.cs
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261
src/NadekoBot.Generators/Cloneable/CloneableGenerator.cs
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// Code temporarily yeeted from
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// https://github.com/mostmand/Cloneable/blob/master/Cloneable/CloneableGenerator.cs
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// because of NRT issue
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#nullable enable
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using Microsoft.CodeAnalysis;
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using Microsoft.CodeAnalysis.CSharp;
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using Microsoft.CodeAnalysis.CSharp.Syntax;
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using Microsoft.CodeAnalysis.Text;
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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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namespace Cloneable
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{
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[Generator]
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public class CloneableGenerator : ISourceGenerator
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{
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private const string PreventDeepCopyKeyString = "PreventDeepCopy";
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private const string ExplicitDeclarationKeyString = "ExplicitDeclaration";
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private const string CloneableNamespace = "Cloneable";
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private const string CloneableAttributeString = "CloneableAttribute";
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private const string CloneAttributeString = "CloneAttribute";
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private const string IgnoreCloneAttributeString = "IgnoreCloneAttribute";
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private const string cloneableAttributeText = @"// <AutoGenerated/>
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using System;
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namespace " + CloneableNamespace + @"
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{
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[AttributeUsage(AttributeTargets.Class | AttributeTargets.Struct, Inherited = true, AllowMultiple = false)]
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public sealed class " + CloneableAttributeString + @" : Attribute
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{
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public " + CloneableAttributeString + @"()
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{
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}
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public bool " + ExplicitDeclarationKeyString + @" { get; set; }
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}
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}
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";
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private const string clonePropertyAttributeText = @"// <AutoGenerated/>
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using System;
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namespace " + CloneableNamespace + @"
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{
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[AttributeUsage(AttributeTargets.Property, Inherited = true, AllowMultiple = false)]
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public sealed class " + CloneAttributeString + @" : Attribute
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{
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public " + CloneAttributeString + @"()
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{
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}
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public bool " + PreventDeepCopyKeyString + @" { get; set; }
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}
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}
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";
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private const string ignoreClonePropertyAttributeText = @"// <AutoGenerated/>
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using System;
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namespace " + CloneableNamespace + @"
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{
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[AttributeUsage(AttributeTargets.Property, Inherited = true, AllowMultiple = false)]
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public sealed class " + IgnoreCloneAttributeString + @" : Attribute
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{
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public " + IgnoreCloneAttributeString + @"()
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{
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}
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}
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}
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";
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private INamedTypeSymbol? cloneableAttribute;
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private INamedTypeSymbol? ignoreCloneAttribute;
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private INamedTypeSymbol? cloneAttribute;
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public void Initialize(GeneratorInitializationContext context)
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{
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context.RegisterForSyntaxNotifications(() => new SyntaxReceiver());
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}
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public void Execute(GeneratorExecutionContext context)
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{
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InjectCloneableAttributes(context);
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GenerateCloneMethods(context);
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}
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private void GenerateCloneMethods(GeneratorExecutionContext context)
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{
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if (context.SyntaxReceiver is not SyntaxReceiver receiver)
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return;
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Compilation compilation = GetCompilation(context);
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InitAttributes(compilation);
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var classSymbols = GetClassSymbols(compilation, receiver);
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foreach (var classSymbol in classSymbols)
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{
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if (!classSymbol.TryGetAttribute(cloneableAttribute!, out var attributes))
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continue;
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var attribute = attributes.Single();
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var isExplicit = (bool?)attribute.NamedArguments.FirstOrDefault(e => e.Key.Equals(ExplicitDeclarationKeyString)).Value.Value ?? false;
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context.AddSource($"{classSymbol.Name}_cloneable.g.cs", SourceText.From(CreateCloneableCode(classSymbol, isExplicit), Encoding.UTF8));
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}
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}
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private void InitAttributes(Compilation compilation)
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{
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cloneableAttribute = compilation.GetTypeByMetadataName($"{CloneableNamespace}.{CloneableAttributeString}")!;
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cloneAttribute = compilation.GetTypeByMetadataName($"{CloneableNamespace}.{CloneAttributeString}")!;
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ignoreCloneAttribute = compilation.GetTypeByMetadataName($"{CloneableNamespace}.{IgnoreCloneAttributeString}")!;
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}
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private static Compilation GetCompilation(GeneratorExecutionContext context)
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{
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var options = context.Compilation.SyntaxTrees.First().Options as CSharpParseOptions;
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var compilation = context.Compilation.AddSyntaxTrees(CSharpSyntaxTree.ParseText(SourceText.From(cloneableAttributeText, Encoding.UTF8), options)).
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AddSyntaxTrees(CSharpSyntaxTree.ParseText(SourceText.From(clonePropertyAttributeText, Encoding.UTF8), options)).
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AddSyntaxTrees(CSharpSyntaxTree.ParseText(SourceText.From(ignoreClonePropertyAttributeText, Encoding.UTF8), options));
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return compilation;
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}
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private string CreateCloneableCode(INamedTypeSymbol classSymbol, bool isExplicit)
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{
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string namespaceName = classSymbol.ContainingNamespace.ToDisplayString();
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var fieldAssignmentsCode = GenerateFieldAssignmentsCode(classSymbol, isExplicit);
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var fieldAssignmentsCodeSafe = fieldAssignmentsCode.Select(x =>
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{
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if (x.isCloneable)
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return x.line + "Safe(referenceChain)";
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return x.line;
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});
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var fieldAssignmentsCodeFast = fieldAssignmentsCode.Select(x =>
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{
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if (x.isCloneable)
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return x.line + "()";
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return x.line;
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});
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return $@"using System.Collections.Generic;
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namespace {namespaceName}
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{{
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{GetAccessModifier(classSymbol)} partial class {classSymbol.Name}
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{{
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/// <summary>
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/// Creates a copy of {classSymbol.Name} with NO circular reference checking. This method should be used if performance matters.
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///
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/// <exception cref=""StackOverflowException"">Will occur on any object that has circular references in the hierarchy.</exception>
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/// </summary>
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public {classSymbol.Name} Clone()
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{{
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return new {classSymbol.Name}
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{{
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{string.Join($",{Environment.NewLine}", fieldAssignmentsCodeFast)}
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}};
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}}
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/// <summary>
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/// Creates a copy of {classSymbol.Name} with circular reference checking. If a circular reference was detected, only a reference of the leaf object is passed instead of cloning it.
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/// </summary>
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/// <param name=""referenceChain"">Should only be provided if specific objects should not be cloned but passed by reference instead.</param>
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public {classSymbol.Name} CloneSafe(Stack<object> referenceChain = null)
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{{
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if(referenceChain?.Contains(this) == true)
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return this;
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referenceChain ??= new Stack<object>();
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referenceChain.Push(this);
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var result = new {classSymbol.Name}
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{{
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{string.Join($",{Environment.NewLine}", fieldAssignmentsCodeSafe)}
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}};
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referenceChain.Pop();
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return result;
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}}
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}}
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}}";
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}
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private IEnumerable<(string line, bool isCloneable)> GenerateFieldAssignmentsCode(INamedTypeSymbol classSymbol, bool isExplicit )
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{
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var fieldNames = GetCloneableProperties(classSymbol, isExplicit);
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var fieldAssignments = fieldNames.Select(field => IsFieldCloneable(field, classSymbol)).
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OrderBy(x => x.isCloneable).
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Select(x => (GenerateAssignmentCode(x.item.Name, x.isCloneable), x.isCloneable));
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return fieldAssignments;
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}
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private string GenerateAssignmentCode(string name, bool isCloneable)
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{
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if (isCloneable)
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{
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return $@" {name} = this.{name}?.Clone";
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}
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return $@" {name} = this.{name}";
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}
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private (IPropertySymbol item, bool isCloneable) IsFieldCloneable(IPropertySymbol x, INamedTypeSymbol classSymbol)
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{
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if (SymbolEqualityComparer.Default.Equals(x.Type, classSymbol))
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{
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return (x, false);
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}
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if (!x.Type.TryGetAttribute(cloneableAttribute!, out var attributes))
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{
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return (x, false);
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}
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var preventDeepCopy = (bool?)attributes.Single().NamedArguments.FirstOrDefault(e => e.Key.Equals(PreventDeepCopyKeyString)).Value.Value ?? false;
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return (item: x, !preventDeepCopy);
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}
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private string GetAccessModifier(INamedTypeSymbol classSymbol)
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{
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return classSymbol.DeclaredAccessibility.ToString().ToLowerInvariant();
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}
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private IEnumerable<IPropertySymbol> GetCloneableProperties(ITypeSymbol classSymbol, bool isExplicit)
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{
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var targetSymbolMembers = classSymbol.GetMembers().OfType<IPropertySymbol>()
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.Where(x => x.SetMethod is not null &&
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x.CanBeReferencedByName);
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if (isExplicit)
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{
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return targetSymbolMembers.Where(x => x.HasAttribute(cloneAttribute!));
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}
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else
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{
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return targetSymbolMembers.Where(x => !x.HasAttribute(ignoreCloneAttribute!));
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}
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}
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private static IEnumerable<INamedTypeSymbol> GetClassSymbols(Compilation compilation, SyntaxReceiver receiver)
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{
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return receiver.CandidateClasses.Select(clazz => GetClassSymbol(compilation, clazz));
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}
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private static INamedTypeSymbol GetClassSymbol(Compilation compilation, ClassDeclarationSyntax clazz)
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{
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var model = compilation.GetSemanticModel(clazz.SyntaxTree);
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var classSymbol = model.GetDeclaredSymbol(clazz)!;
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return classSymbol;
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}
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private static void InjectCloneableAttributes(GeneratorExecutionContext context)
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{
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context.AddSource(CloneableAttributeString, SourceText.From(cloneableAttributeText, Encoding.UTF8));
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context.AddSource(CloneAttributeString, SourceText.From(clonePropertyAttributeText, Encoding.UTF8));
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context.AddSource(IgnoreCloneAttributeString, SourceText.From(ignoreClonePropertyAttributeText, Encoding.UTF8));
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}
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}
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}
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