| 1 | using System.Collections.Concurrent; |
| 2 | using System.Text; |
| 3 | using Microsoft.CodeAnalysis; |
| 4 | using Microsoft.CodeAnalysis.CSharp; |
| 5 | |
| 6 | namespace CascadeIDE.Services; |
| 7 | |
| 8 | /// <summary> |
| 9 | /// Resolves global usings for ad-hoc Roslyn compilations: MSBuild <c>GlobalUsings.g.cs</c>, |
| 10 | /// project <c>GlobalUsings.cs</c>, then SDK implicit + csproj <c>Using</c> items. |
| 11 | /// </summary> |
| 12 | public static class CSharpProjectGlobalUsingsResolver |
| 13 | { |
| 14 | private sealed record CacheEntry(long ProjectTicks, long GeneratedTicks, SyntaxTree Tree); |
| 15 | |
| 16 | private static readonly ConcurrentDictionary<string, CacheEntry> Cache = new(StringComparer.OrdinalIgnoreCase); |
| 17 | |
| 18 | public static SyntaxTree ResolveGlobalUsingsTree(string sourceFilePath) |
| 19 | { |
| 20 | var projectPath = FindOwningProjectFile(sourceFilePath); |
| 21 | if (projectPath is null) |
| 22 | return CreateTree(CSharpSdkImplicitUsingsCatalog.ForProjectSdk("Microsoft.NET.Sdk", implicitUsingsEnabled: true), "__cascade_global_usings__.g.cs"); |
| 23 | |
| 24 | var projectTicks = File.GetLastWriteTimeUtc(projectPath).Ticks; |
| 25 | var generatedPath = TryFindGeneratedGlobalUsingsPath(projectPath); |
| 26 | var generatedTicks = generatedPath is not null && File.Exists(generatedPath) |
| 27 | ? File.GetLastWriteTimeUtc(generatedPath).Ticks |
| 28 | : 0L; |
| 29 | |
| 30 | if (Cache.TryGetValue(projectPath, out var cached) |
| 31 | && cached.ProjectTicks == projectTicks |
| 32 | && cached.GeneratedTicks == generatedTicks) |
| 33 | { |
| 34 | return cached.Tree; |
| 35 | } |
| 36 | |
| 37 | var tree = BuildTree(projectPath, generatedPath); |
| 38 | Cache[projectPath] = new CacheEntry(projectTicks, generatedTicks, tree); |
| 39 | return tree; |
| 40 | } |
| 41 | |
| 42 | public static void ClearCache() => Cache.Clear(); |
| 43 | |
| 44 | internal static string? FindOwningProjectFile(string sourceFilePath) |
| 45 | { |
| 46 | var dir = Path.GetDirectoryName(sourceFilePath); |
| 47 | while (!string.IsNullOrWhiteSpace(dir)) |
| 48 | { |
| 49 | try |
| 50 | { |
| 51 | if (Directory.Exists(dir)) |
| 52 | { |
| 53 | var projects = Directory.EnumerateFiles(dir, "*.csproj", SearchOption.TopDirectoryOnly).ToList(); |
| 54 | if (projects.Count == 1) |
| 55 | return projects[0]; |
| 56 | if (projects.Count > 1) |
| 57 | { |
| 58 | var fileName = Path.GetFileNameWithoutExtension(sourceFilePath); |
| 59 | var match = projects.FirstOrDefault(p => |
| 60 | string.Equals(Path.GetFileNameWithoutExtension(p), fileName, StringComparison.OrdinalIgnoreCase)); |
| 61 | if (match is not null) |
| 62 | return match; |
| 63 | return projects.OrderBy(static p => p.Length).First(); |
| 64 | } |
| 65 | } |
| 66 | |
| 67 | dir = Path.GetDirectoryName(dir); |
| 68 | } |
| 69 | catch |
| 70 | { |
| 71 | dir = Path.GetDirectoryName(dir); |
| 72 | } |
| 73 | } |
| 74 | |
| 75 | return null; |
| 76 | } |
| 77 | |
| 78 | internal static string? TryFindGeneratedGlobalUsingsPath(string projectPath) |
| 79 | { |
| 80 | var projectDir = Path.GetDirectoryName(projectPath); |
| 81 | if (string.IsNullOrWhiteSpace(projectDir)) |
| 82 | return null; |
| 83 | |
| 84 | var objDir = Path.Combine(projectDir, "obj"); |
| 85 | if (!Directory.Exists(objDir)) |
| 86 | return null; |
| 87 | |
| 88 | try |
| 89 | { |
| 90 | return Directory.EnumerateFiles(objDir, "GlobalUsings.g.cs", SearchOption.AllDirectories) |
| 91 | .Select(path => new FileInfo(path)) |
| 92 | .OrderByDescending(info => info.LastWriteTimeUtc) |
| 93 | .Select(info => info.FullName) |
| 94 | .FirstOrDefault(); |
| 95 | } |
| 96 | catch |
| 97 | { |
| 98 | return null; |
| 99 | } |
| 100 | } |
| 101 | |
| 102 | private static SyntaxTree BuildTree(string projectPath, string? generatedPath) |
| 103 | { |
| 104 | if (!string.IsNullOrWhiteSpace(generatedPath) && File.Exists(generatedPath)) |
| 105 | { |
| 106 | try |
| 107 | { |
| 108 | return CSharpSyntaxTree.ParseText(File.ReadAllText(generatedPath), path: generatedPath); |
| 109 | } |
| 110 | catch |
| 111 | { |
| 112 | // Fall through to synthesis. |
| 113 | } |
| 114 | } |
| 115 | |
| 116 | var projectDir = Path.GetDirectoryName(projectPath)!; |
| 117 | var authoredPath = Path.Combine(projectDir, "GlobalUsings.cs"); |
| 118 | if (File.Exists(authoredPath)) |
| 119 | { |
| 120 | try |
| 121 | { |
| 122 | return CSharpSyntaxTree.ParseText(File.ReadAllText(authoredPath), path: authoredPath); |
| 123 | } |
| 124 | catch |
| 125 | { |
| 126 | // Fall through to synthesis. |
| 127 | } |
| 128 | } |
| 129 | |
| 130 | var profile = CSharpProjectUsingsProfile.TryLoad(projectPath); |
| 131 | if (profile is null) |
| 132 | return CreateTree([], "__cascade_global_usings__.g.cs"); |
| 133 | |
| 134 | var merged = profile.ResolveNamespaces(); |
| 135 | var virtualPath = Path.Combine(projectDir, "obj", "__cascade_synthesized_global_usings__.g.cs"); |
| 136 | return CreateTree(merged, virtualPath); |
| 137 | } |
| 138 | |
| 139 | private static SyntaxTree CreateTree(IReadOnlyList<string> namespaces, string path) |
| 140 | { |
| 141 | var sb = new StringBuilder(); |
| 142 | sb.AppendLine("// <auto-generated by CascadeIDE — SDK/csproj global usings />"); |
| 143 | foreach (var ns in namespaces) |
| 144 | sb.AppendLine($"global using {ns};"); |
| 145 | |
| 146 | return CSharpSyntaxTree.ParseText(sb.ToString(), path: path); |
| 147 | } |
| 148 | } |
| 149 | |