Do not use exceptions for missing grammars. Fixes #52692

package.json

@@ -48,7 +48,7 @@
     "vscode-debugprotocol": "1.28.0",
     "vscode-nsfw": "1.0.17",
     "vscode-ripgrep": "^1.0.1",
-    "vscode-textmate": "^4.0.0-next.2",
+    "vscode-textmate": "^4.0.1",
     "vscode-xterm": "3.5.0-beta17",
     "yauzl": "^2.9.1"
   },

src/vs/workbench/services/textMate/electron-browser/TMSyntax.ts

@@ -25,6 +25,7 @@ import { Color } from 'vs/base/common/color';
 import { INotificationService } from 'vs/platform/notification/common/notification';
 import URI from 'vs/base/common/uri';
 import { IFileService } from 'vs/platform/files/common/files';
+import { ILogService } from 'vs/platform/log/common/log';
 
 export class TMScopeRegistry {
 
@@ -139,6 +140,7 @@ export class TextMateService implements ITextMateService {
 	private _modeService: IModeService;
 	private _themeService: IWorkbenchThemeService;
 	private _fileService: IFileService;
+	private _logService: ILogService;
 	private _scopeRegistry: TMScopeRegistry;
 	private _injections: { [scopeName: string]: string[]; };
 	private _injectedEmbeddedLanguages: { [scopeName: string]: IEmbeddedLanguagesMap[]; };
@@ -155,13 +157,15 @@ export class TextMateService implements ITextMateService {
 		@IModeService modeService: IModeService,
 		@IWorkbenchThemeService themeService: IWorkbenchThemeService,
 		@IFileService fileService: IFileService,
-		@INotificationService notificationService: INotificationService
+		@INotificationService notificationService: INotificationService,
+		@ILogService logService: ILogService
 	) {
 		this._styleElement = dom.createStyleSheet();
 		this._styleElement.className = 'vscode-tokens-styles';
 		this._modeService = modeService;
 		this._themeService = themeService;
 		this._fileService = fileService;
+		this._logService = logService;
 		this._scopeRegistry = new TMScopeRegistry();
 		this.onDidEncounterLanguage = this._scopeRegistry.onDidEncounterLanguage;
 		this._injections = {};
@@ -212,10 +216,14 @@ export class TextMateService implements ITextMateService {
 					loadGrammar: (scopeName: string) => {
 						const location = this._scopeRegistry.getGrammarLocation(scopeName);
 						if (!location) {
+							this._logService.info(`No grammar found for scope ${scopeName}`);
 							return null;
 						}
 						return this._fileService.resolveContent(location).then(content => {
 							return parseRawGrammar(content.value, location.path);
+						}, e => {
+							this._logService.error(`Unable to load and parse grammar for scope ${scopeName} from ${location}`, e);
+							return null;
 						});
 					},
 					getInjections: (scopeName: string) => {

yarn.lock

@@ -1798,7 +1798,7 @@ fast-levenshtein@~2.0.4:
   version "2.0.6"
   resolved "https://registry.yarnpkg.com/fast-levenshtein/-/fast-levenshtein-2.0.6.tgz#3d8a5c66883a16a30ca8643e851f19baa7797917"
 
-fast-plist@0.1.2, fast-plist@^0.1.2:
+fast-plist@0.1.2:
   version "0.1.2"
   resolved "https://registry.yarnpkg.com/fast-plist/-/fast-plist-0.1.2.tgz#a45aff345196006d406ca6cdcd05f69051ef35b8"
 
@@ -6250,11 +6250,10 @@ vscode-ripgrep@^1.0.1:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/vscode-ripgrep/-/vscode-ripgrep-1.0.1.tgz#eff2f2b2a49921ac0acd3ff8dfecaaeebf0184cf"
 
-vscode-textmate@^4.0.0-next.2:
-  version "4.0.0-next.2"
-  resolved "https://registry.yarnpkg.com/vscode-textmate/-/vscode-textmate-4.0.0-next.2.tgz#03b6c1feb7d297cb70e24cc1166ce2d5c619e440"
+vscode-textmate@^4.0.1:
+  version "4.0.1"
+  resolved "https://registry.yarnpkg.com/vscode-textmate/-/vscode-textmate-4.0.1.tgz#6c36f28e9059ce12bc34907f7a33ea43166b26a8"
   dependencies:
-    fast-plist "^0.1.2"
     oniguruma "^7.0.0"
 
 vscode-xterm@3.5.0-beta17: