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| 1 | +// Copyright (c) Microsoft Corporation. All rights reserved. |
| 2 | +// Licensed under the MIT license. See LICENSE file in the project root for full license information. |
| 3 | + |
| 4 | +using Microsoft.CodeAnalysis.CSharp; |
| 5 | + |
| 6 | +namespace Microsoft.ServiceHub.Analyzers.GeneratorModels; |
| 7 | + |
| 8 | +/// <summary> |
| 9 | +/// A namespace or nesting type that must be reproduced in generated code in order to declare a potentially nested partial type. |
| 10 | +/// </summary> |
| 11 | +/// <param name="Name">The leaf name of the namespace or the name of the nesting type.</param> |
| 12 | +/// <param name="Parent">The parent namespace or nesting type.</param> |
| 13 | +internal abstract record Container(string Name, Container? Parent = null) |
| 14 | +{ |
| 15 | + internal abstract bool IsPartial { get; } |
| 16 | + |
| 17 | + internal bool IsFullyPartial => this.IsPartial && (this.Parent is null || this.Parent.IsFullyPartial); |
| 18 | + |
| 19 | + internal abstract string Keywords { get; } |
| 20 | + |
| 21 | + internal string FullName => this.Parent is null ? this.Name : $"{this.Parent.FullName}.{this.Name}"; |
| 22 | + |
| 23 | + /// <summary> |
| 24 | + /// Gets the first namespace in the chain of containers, starting with this one. |
| 25 | + /// </summary> |
| 26 | + internal Namespace? ThisOrContainingNamespace => this is Namespace ns ? ns : this.Parent?.ThisOrContainingNamespace; |
| 27 | + |
| 28 | + internal static Container? CreateFor(INamespaceOrTypeSymbol? symbol, CancellationToken cancellationToken) |
| 29 | + { |
| 30 | + if (symbol is null or INamespaceSymbol { IsGlobalNamespace: true }) |
| 31 | + { |
| 32 | + return null; |
| 33 | + } |
| 34 | + |
| 35 | + Container? parent = CreateFor((INamespaceOrTypeSymbol)symbol.ContainingType ?? symbol.ContainingNamespace, cancellationToken); |
| 36 | + |
| 37 | + return symbol switch |
| 38 | + { |
| 39 | + ITypeSymbol type => new Type(type.Name, IsPartial(), GetTypeKeyword(type), parent), |
| 40 | + INamespaceSymbol ns => new Namespace(ns.Name, parent), |
| 41 | + _ => throw new ArgumentException($"Unsupported symbol type: {symbol.GetType().Name}.", nameof(symbol)), |
| 42 | + }; |
| 43 | + |
| 44 | + bool IsPartial() => (symbol.DeclaringSyntaxReferences.FirstOrDefault()?.GetSyntax(cancellationToken) as MemberDeclarationSyntax)?.Modifiers.Any(SyntaxKind.PartialKeyword) is true; |
| 45 | + |
| 46 | + static string GetTypeKeyword(ITypeSymbol symbol) |
| 47 | + { |
| 48 | + return symbol switch |
| 49 | + { |
| 50 | + { TypeKind: TypeKind.Class, IsRecord: false } => "class", |
| 51 | + { TypeKind: TypeKind.Class, IsRecord: true } => "record", |
| 52 | + { TypeKind: TypeKind.Struct, IsRecord: false } => "struct", |
| 53 | + { TypeKind: TypeKind.Struct, IsRecord: true } => "record struct", |
| 54 | + { TypeKind: TypeKind.Interface } => "interface", |
| 55 | + _ => throw new ArgumentException($"Unsupported type kind: {symbol.TypeKind}.", nameof(symbol)), |
| 56 | + }; |
| 57 | + } |
| 58 | + } |
| 59 | + |
| 60 | + internal void WriteWithin(SourceWriter writer, Action<SourceWriter> writeContent) |
| 61 | + { |
| 62 | + this.VerifyPartiality(); |
| 63 | + if (this.Parent is null) |
| 64 | + { |
| 65 | + this.WriteWithinCore(writer, writeContent); |
| 66 | + } |
| 67 | + else |
| 68 | + { |
| 69 | + this.Parent.WriteWithin(writer, writer => this.WriteWithinCore(writer, writeContent)); |
| 70 | + } |
| 71 | + } |
| 72 | + |
| 73 | + private void VerifyPartiality() |
| 74 | + { |
| 75 | + if (!this.IsPartial) |
| 76 | + { |
| 77 | + throw new InvalidOperationException($"The {this.FullName} container must be declared as partial."); |
| 78 | + } |
| 79 | + |
| 80 | + this.Parent?.VerifyPartiality(); |
| 81 | + } |
| 82 | + |
| 83 | + private void WriteWithinCore(SourceWriter writer, Action<SourceWriter> writeContent) |
| 84 | + { |
| 85 | + writer.WriteLine($"{this.Keywords} {this.Name}"); |
| 86 | + writer.WriteLine("{"); |
| 87 | + writer.Indentation++; |
| 88 | + writeContent(writer); |
| 89 | + writer.Indentation--; |
| 90 | + writer.WriteLine("}"); |
| 91 | + } |
| 92 | + |
| 93 | + internal record Namespace(string Name, Container? Parent = null) : Container(Name, Parent) |
| 94 | + { |
| 95 | + internal override bool IsPartial => true; |
| 96 | + |
| 97 | + internal override string Keywords => "namespace"; |
| 98 | + } |
| 99 | + |
| 100 | + internal record Type : Container |
| 101 | + { |
| 102 | + private readonly bool isPartial; |
| 103 | + private readonly string typeKeyword; |
| 104 | + |
| 105 | + internal Type(string name, bool isPartial, string typeKeyword, Container? parent = null) |
| 106 | + : base(name, parent) |
| 107 | + { |
| 108 | + this.isPartial = isPartial; |
| 109 | + this.typeKeyword = typeKeyword; |
| 110 | + } |
| 111 | + |
| 112 | + internal override bool IsPartial => this.isPartial; |
| 113 | + |
| 114 | + internal override string Keywords => this.IsPartial ? $"partial {this.typeKeyword}" : this.typeKeyword; |
| 115 | + } |
| 116 | +} |
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