Add a TextDocumentContentProvider for source-generated files

CHANGELOG.md

@@ -4,6 +4,13 @@
 - Debug from .csproj and .sln [#5876](https://github.com/dotnet/vscode-csharp/issues/5876)
 
 # Latest
+* Update Roslyn to 4.13.0-1.24503.11 (PR: [#7618](https://github.com/dotnet/vscode-csharp/pull/7618))
+  * LSP hover responses escape backticks within inline code (PR: [#75364](https://github.com/dotnet/roslyn/pull/75364))
+  * Localize build host message output (PR: [#74910](https://github.com/dotnet/roslyn/pull/74910))
+  * Log and report NFW when we fail to apply project system update (PR: [#75362](https://github.com/dotnet/roslyn/pull/75362))
+  * Reduce allocations and UI thread CPU costs in WithDoNotCreateCreationPolicy (PR: [#75358](https://github.com/dotnet/roslyn/pull/75358))
+  * Enable support for an LSP client to open source generated files (PR: [#75180](https://github.com/dotnet/roslyn/pull/75180))
+  * Improve error reporting when reading bad metadata during EnC (PR: [#75304](https://github.com/dotnet/roslyn/pull/75304))
 * Suppress recoverable errors from razor LSP (PR: [#7624](https://github.com/dotnet/vscode-csharp/pull/7624))
   * NOTE: this can be re-enabled by setting `razor.languageServer.suppressLspErrorToasts = false`
 * Update Roslyn to 4.13.0-1.24501.3 (PR: [#7618](https://github.com/dotnet/vscode-csharp/pull/7618))

package.json

@@ -37,7 +37,7 @@
     }
   },
   "defaults": {
-    "roslyn": "4.13.0-1.24501.3",
+    "roslyn": "4.13.0-1.24503.11",
     "omniSharp": "1.39.11",
     "razor": "9.0.0-preview.24480.1",
     "razorOmnisharp": "7.0.0-preview.23363.1",

src/lsptoolshost/roslynLanguageServer.ts

@@ -74,6 +74,7 @@ import {
     showErrorMessage,
     showInformationMessage,
 } from '../shared/observers/utils/showMessage';
+import { registerSourceGeneratedFilesContentProvider } from './sourceGeneratedFilesContentProvider';
 
 let _channel: vscode.OutputChannel;
 let _traceChannel: vscode.OutputChannel;
@@ -1068,6 +1069,8 @@ export async function activateRoslynLanguageServer(
 
     registerRestoreCommands(context, languageServer, dotnetChannel);
 
+    registerSourceGeneratedFilesContentProvider(context, languageServer);
+
     context.subscriptions.push(registerLanguageServerOptionChanges(optionObservable));
 
     return languageServer;

src/lsptoolshost/roslynProtocol.ts

@@ -230,6 +230,14 @@ export interface CopilotRelatedDocumentsReport {
     _vs_file_paths?: string[];
 }
 
+export interface SourceGeneratorGetRequestParams {
+    textDocument: lsp.TextDocumentIdentifier;
+}
+
+export interface SourceGeneratedDocumentText {
+    text: string;
+}
+
 export namespace WorkspaceDebugConfigurationRequest {
     export const method = 'workspace/debugConfiguration';
     export const messageDirection: lsp.MessageDirection = lsp.MessageDirection.clientToServer;
@@ -351,3 +359,9 @@ export namespace CopilotRelatedDocumentsRequest {
         void
     >(method);
 }
+
+export namespace SourceGeneratorGetTextRequest {
+    export const method = 'sourceGeneratedDocument/_roslyn_getText';
+    export const messageDirection: lsp.MessageDirection = lsp.MessageDirection.clientToServer;
+    export const type = new lsp.RequestType<SourceGeneratorGetRequestParams, SourceGeneratedDocumentText, void>(method);
+}

src/lsptoolshost/sourceGeneratedFilesContentProvider.ts

@@ -0,0 +1,31 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the MIT License. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+
+import * as vscode from 'vscode';
+import * as RoslynProtocol from './roslynProtocol';
+import { RoslynLanguageServer } from './roslynLanguageServer';
+import { UriConverter } from './uriConverter';
+import * as lsp from 'vscode-languageserver-protocol';
+
+export function registerSourceGeneratedFilesContentProvider(
+    context: vscode.ExtensionContext,
+    languageServer: RoslynLanguageServer
+) {
+    context.subscriptions.push(
+        vscode.workspace.registerTextDocumentContentProvider(
+            'roslyn-source-generated',
+            new (class implements vscode.TextDocumentContentProvider {
+                async provideTextDocumentContent(uri: vscode.Uri, token: vscode.CancellationToken): Promise<string> {
+                    const result = await languageServer.sendRequest(
+                        RoslynProtocol.SourceGeneratorGetTextRequest.type,
+                        { textDocument: lsp.TextDocumentIdentifier.create(UriConverter.serialize(uri)) },
+                        token
+                    );
+                    return result.text;
+                }
+            })()
+        )
+    );
+}