Scaffold viewport semantic tokens

src/vs/editor/contrib/viewportSemanticTokens/viewportSemanticTokens.ts

+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the MIT License. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+
+import { RunOnceScheduler } from 'vs/base/common/async';
+import { Disposable } from 'vs/base/common/lifecycle';
+import { ICodeEditor } from 'vs/editor/browser/editorBrowser';
+import { registerEditorContribution } from 'vs/editor/browser/editorExtensions';
+import { IEditorContribution } from 'vs/editor/common/editorCommon';
+import { ITextModel } from 'vs/editor/common/model';
+import { DocumentRangeSemanticTokensProviderRegistry, DocumentRangeSemanticTokensProvider } from 'vs/editor/common/modes';
+
+class ViewportSemanticTokensContribution extends Disposable implements IEditorContribution {
+
+	public static readonly ID = 'editor.contrib.viewportSemanticTokens';
+
+	public static get(editor: ICodeEditor): ViewportSemanticTokensContribution {
+		return editor.getContribution<ViewportSemanticTokensContribution>(ViewportSemanticTokensContribution.ID);
+	}
+
+	private readonly _editor: ICodeEditor;
+	private readonly _tokenizeViewport: RunOnceScheduler;
+
+	constructor(editor: ICodeEditor) {
+		super();
+		this._editor = editor;
+		this._tokenizeViewport = new RunOnceScheduler(() => this._tokenizeViewportNow(), 100);
+		this._register(this._editor.onDidScrollChange(() => {
+			this._tokenizeViewport.schedule();
+		}));
+		this._register(this._editor.onDidChangeModel(() => {
+			this._tokenizeViewport.schedule();
+		}));
+		this._register(DocumentRangeSemanticTokensProviderRegistry.onDidChange(() => {
+			this._tokenizeViewport.schedule();
+		}));
+	}
+
+	private static _getSemanticColoringProvider(model: ITextModel): DocumentRangeSemanticTokensProvider | null {
+		const result = DocumentRangeSemanticTokensProviderRegistry.ordered(model);
+		return (result.length > 0 ? result[0] : null);
+	}
+
+	private _tokenizeViewportNow(): void {
+		if (!this._editor.hasModel()) {
+			return;
+		}
+		const model = this._editor.getModel();
+		const provider = ViewportSemanticTokensContribution._getSemanticColoringProvider(model);
+		if (!provider) {
+			return;
+		}
+
+		// const visibleRanges = this._editor.getVisibleRanges();
+		// console.log(`_tokenizeViewportNow ---> ${visibleRanges.map(r => r.toString()).join(', ')}`);
+	}
+}
+
+registerEditorContribution(ViewportSemanticTokensContribution.ID, ViewportSemanticTokensContribution);

src/vs/editor/editor.all.ts

@@ -39,6 +39,7 @@ import 'vs/editor/contrib/snippet/snippetController2';
 import 'vs/editor/contrib/suggest/suggestController';
 import 'vs/editor/contrib/tokenization/tokenization';
 import 'vs/editor/contrib/toggleTabFocusMode/toggleTabFocusMode';
+import 'vs/editor/contrib/viewportSemanticTokens/viewportSemanticTokens';
 import 'vs/editor/contrib/wordHighlighter/wordHighlighter';
 import 'vs/editor/contrib/wordOperations/wordOperations';
 import 'vs/editor/contrib/wordPartOperations/wordPartOperations';