完成世界书、骰子、apiconfig页面处理

frontend/node_modules/langium/lib/utils/promise-utils.js

@@ -0,0 +1,99 @@
+/******************************************************************************
+ * Copyright 2021 TypeFox GmbH
+ * This program and the accompanying materials are made available under the
+ * terms of the MIT License, which is available in the project root.
+ ******************************************************************************/
+import { CancellationToken, CancellationTokenSource } from '../utils/cancellation.js';
+/**
+ * Delays the execution of the current code to the next tick of the event loop.
+ * Don't call this method directly in a tight loop to prevent too many promises from being created.
+ */
+export function delayNextTick() {
+    return new Promise(resolve => {
+        // In case we are running in a non-node environment, `setImmediate` isn't available.
+        // Using `setTimeout` of the browser API accomplishes the same result.
+        if (typeof setImmediate === 'undefined') {
+            setTimeout(resolve, 0);
+        }
+        else {
+            setImmediate(resolve);
+        }
+    });
+}
+let lastTick = 0;
+let globalInterruptionPeriod = 10;
+/**
+ * Reset the global interruption period and create a cancellation token source.
+ */
+export function startCancelableOperation() {
+    lastTick = performance.now();
+    return new CancellationTokenSource();
+}
+/**
+ * Change the period duration for `interruptAndCheck` to the given number of milliseconds.
+ * The default value is 10ms.
+ */
+export function setInterruptionPeriod(period) {
+    globalInterruptionPeriod = period;
+}
+/**
+ * This symbol may be thrown in an asynchronous context by any Langium service that receives
+ * a `CancellationToken`. This means that the promise returned by such a service is rejected with
+ * this symbol as rejection reason.
+ */
+export const OperationCancelled = Symbol('OperationCancelled');
+/**
+ * Use this in a `catch` block to check whether the thrown object indicates that the operation
+ * has been cancelled.
+ */
+export function isOperationCancelled(err) {
+    return err === OperationCancelled;
+}
+/**
+ * This function does two things:
+ *  1. Check the elapsed time since the last call to this function or to `startCancelableOperation`. If the predefined
+ *     period (configured with `setInterruptionPeriod`) is exceeded, execution is delayed with `delayNextTick`.
+ *  2. If the predefined period is not met yet or execution is resumed after an interruption, the given cancellation
+ *     token is checked, and if cancellation is requested, `OperationCanceled` is thrown.
+ *
+ * All services in Langium that receive a `CancellationToken` may potentially call this function, so the
+ * `CancellationToken` must be caught (with an `async` try-catch block or a `catch` callback attached to
+ * the promise) to avoid that event being exposed as an error.
+ */
+export async function interruptAndCheck(token) {
+    if (token === CancellationToken.None) {
+        // Early exit in case cancellation was disabled by the caller
+        return;
+    }
+    const current = performance.now();
+    if (current - lastTick >= globalInterruptionPeriod) {
+        lastTick = current;
+        await delayNextTick();
+        // prevent calling delayNextTick every iteration of loop
+        // where delayNextTick takes up the majority or all of the
+        // globalInterruptionPeriod itself
+        lastTick = performance.now();
+    }
+    if (token.isCancellationRequested) {
+        throw OperationCancelled;
+    }
+}
+/**
+ * Simple implementation of the deferred pattern.
+ * An object that exposes a promise and functions to resolve and reject it.
+ */
+export class Deferred {
+    constructor() {
+        this.promise = new Promise((resolve, reject) => {
+            this.resolve = (arg) => {
+                resolve(arg);
+                return this;
+            };
+            this.reject = (err) => {
+                reject(err);
+                return this;
+            };
+        });
+    }
+}
+//# sourceMappingURL=promise-utils.js.map