Create base class for disposable objects

extensions/markdown-language-features/src/util/dispose.ts

@@ -14,3 +14,29 @@ export function disposeAll(disposables: vscode.Disposable[]) {
 	}
 }
 
+export abstract class Disposable {
+	private _isDisposed = false;
+
+	protected _disposables: vscode.Disposable[] = [];
+
+	public dispose(): any {
+		if (this._isDisposed) {
+			return;
+		}
+		this._isDisposed = true;
+		disposeAll(this._disposables);
+	}
+
+	protected _register<T extends vscode.Disposable>(value: T): T {
+		if (this._isDisposed) {
+			value.dispose();
+		} else {
+			this._disposables.push(value);
+		}
+		return value;
+	}
+
+	protected get isDisposed() {
+		return this._isDisposed;
+	}
+}