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_internal/editor/esm/vs/base/common/cancellation.js

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+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the MIT License. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+import { Emitter, Event } from './event.js';
+const shortcutEvent = Object.freeze(function (callback, context) {
+    const handle = setTimeout(callback.bind(context), 0);
+    return { dispose() { clearTimeout(handle); } };
+});
+export var CancellationToken;
+(function (CancellationToken) {
+    function isCancellationToken(thing) {
+        if (thing === CancellationToken.None || thing === CancellationToken.Cancelled) {
+            return true;
+        }
+        if (thing instanceof MutableToken) {
+            return true;
+        }
+        if (!thing || typeof thing !== 'object') {
+            return false;
+        }
+        return typeof thing.isCancellationRequested === 'boolean'
+            && typeof thing.onCancellationRequested === 'function';
+    }
+    CancellationToken.isCancellationToken = isCancellationToken;
+    CancellationToken.None = Object.freeze({
+        isCancellationRequested: false,
+        onCancellationRequested: Event.None
+    });
+    CancellationToken.Cancelled = Object.freeze({
+        isCancellationRequested: true,
+        onCancellationRequested: shortcutEvent
+    });
+})(CancellationToken || (CancellationToken = {}));
+class MutableToken {
+    constructor() {
+        this._isCancelled = false;
+        this._emitter = null;
+    }
+    cancel() {
+        if (!this._isCancelled) {
+            this._isCancelled = true;
+            if (this._emitter) {
+                this._emitter.fire(undefined);
+                this.dispose();
+            }
+        }
+    }
+    get isCancellationRequested() {
+        return this._isCancelled;
+    }
+    get onCancellationRequested() {
+        if (this._isCancelled) {
+            return shortcutEvent;
+        }
+        if (!this._emitter) {
+            this._emitter = new Emitter();
+        }
+        return this._emitter.event;
+    }
+    dispose() {
+        if (this._emitter) {
+            this._emitter.dispose();
+            this._emitter = null;
+        }
+    }
+}
+export class CancellationTokenSource {
+    constructor(parent) {
+        this._token = undefined;
+        this._parentListener = undefined;
+        this._parentListener = parent && parent.onCancellationRequested(this.cancel, this);
+    }
+    get token() {
+        if (!this._token) {
+            // be lazy and create the token only when
+            // actually needed
+            this._token = new MutableToken();
+        }
+        return this._token;
+    }
+    cancel() {
+        if (!this._token) {
+            // save an object by returning the default
+            // cancelled token when cancellation happens
+            // before someone asks for the token
+            this._token = CancellationToken.Cancelled;
+        }
+        else if (this._token instanceof MutableToken) {
+            // actually cancel
+            this._token.cancel();
+        }
+    }
+    dispose(cancel = false) {
+        if (cancel) {
+            this.cancel();
+        }
+        this._parentListener?.dispose();
+        if (!this._token) {
+            // ensure to initialize with an empty token if we had none
+            this._token = CancellationToken.None;
+        }
+        else if (this._token instanceof MutableToken) {
+            // actually dispose
+            this._token.dispose();
+        }
+    }
+}
+export function cancelOnDispose(store) {
+    const source = new CancellationTokenSource();
+    store.add({ dispose() { source.cancel(); } });
+    return source.token;
+}
+//# sourceMappingURL=cancellation.js.map