mirror of
https://github.com/swc-project/swc.git
synced 2024-12-23 13:51:19 +03:00
4cf58528df
swc_estree_ast: - Fix more serialization. swc_estree_compat: - Consider multi-byte characters. swc_webpack_ast: - Preserve LHS of assignments if required.
646 lines
23 KiB
JavaScript
646 lines
23 KiB
JavaScript
/** @license React v0.20.2
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* scheduler.development.js
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*
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* Copyright (c) Facebook, Inc. and its affiliates.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*/
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'use strict';
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if (process.env.NODE_ENV !== "production") {
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(function () {
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'use strict';
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var enableSchedulerDebugging = false;
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var enableProfiling = false;
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var requestHostCallback;
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var requestHostTimeout;
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var cancelHostTimeout;
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var requestPaint;
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var hasPerformanceNow = typeof performance === 'object' && typeof performance.now === 'function';
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if (hasPerformanceNow) {
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var localPerformance = performance;
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exports.unstable_now = function () {
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return localPerformance.now();
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};
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} else {
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var localDate = Date;
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var initialTime = localDate.now();
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exports.unstable_now = function () {
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return localDate.now() - initialTime;
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};
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}
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if ( // If Scheduler runs in a non-DOM environment, it falls back to a naive
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// implementation using setTimeout.
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typeof window === 'undefined' || // Check if MessageChannel is supported, too.
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typeof MessageChannel !== 'function') {
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// If this accidentally gets imported in a non-browser environment, e.g. JavaScriptCore,
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// fallback to a naive implementation.
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var _callback = null;
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var _timeoutID = null;
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var _flushCallback = function () {
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if (_callback !== null) {
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try {
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var currentTime = exports.unstable_now();
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var hasRemainingTime = true;
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_callback(hasRemainingTime, currentTime);
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_callback = null;
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} catch (e) {
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setTimeout(_flushCallback, 0);
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throw e;
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}
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}
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};
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requestHostCallback = function (cb) {
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if (_callback !== null) {
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// Protect against re-entrancy.
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setTimeout(requestHostCallback, 0, cb);
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} else {
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_callback = cb;
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setTimeout(_flushCallback, 0);
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}
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};
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requestHostTimeout = function (cb, ms) {
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_timeoutID = setTimeout(cb, ms);
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};
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cancelHostTimeout = function () {
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clearTimeout(_timeoutID);
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};
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exports.unstable_shouldYield = function () {
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return false;
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};
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requestPaint = exports.unstable_forceFrameRate = function () { };
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} else {
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// Capture local references to native APIs, in case a polyfill overrides them.
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var _setTimeout = window.setTimeout;
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var _clearTimeout = window.clearTimeout;
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if (typeof console !== 'undefined') {
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// TODO: Scheduler no longer requires these methods to be polyfilled. But
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// maybe we want to continue warning if they don't exist, to preserve the
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// option to rely on it in the future?
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var requestAnimationFrame = window.requestAnimationFrame;
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var cancelAnimationFrame = window.cancelAnimationFrame;
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if (typeof requestAnimationFrame !== 'function') {
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// Using console['error'] to evade Babel and ESLint
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console['error']("This browser doesn't support requestAnimationFrame. " + 'Make sure that you load a ' + 'polyfill in older browsers. https://reactjs.org/link/react-polyfills');
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}
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if (typeof cancelAnimationFrame !== 'function') {
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// Using console['error'] to evade Babel and ESLint
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console['error']("This browser doesn't support cancelAnimationFrame. " + 'Make sure that you load a ' + 'polyfill in older browsers. https://reactjs.org/link/react-polyfills');
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}
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}
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var isMessageLoopRunning = false;
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var scheduledHostCallback = null;
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var taskTimeoutID = -1; // Scheduler periodically yields in case there is other work on the main
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// thread, like user events. By default, it yields multiple times per frame.
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// It does not attempt to align with frame boundaries, since most tasks don't
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// need to be frame aligned; for those that do, use requestAnimationFrame.
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var yieldInterval = 5;
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var deadline = 0; // TODO: Make this configurable
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{
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// `isInputPending` is not available. Since we have no way of knowing if
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// there's pending input, always yield at the end of the frame.
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exports.unstable_shouldYield = function () {
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return exports.unstable_now() >= deadline;
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}; // Since we yield every frame regardless, `requestPaint` has no effect.
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requestPaint = function () { };
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}
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exports.unstable_forceFrameRate = function (fps) {
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if (fps < 0 || fps > 125) {
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// Using console['error'] to evade Babel and ESLint
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console['error']('forceFrameRate takes a positive int between 0 and 125, ' + 'forcing frame rates higher than 125 fps is not supported');
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return;
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}
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if (fps > 0) {
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yieldInterval = Math.floor(1000 / fps);
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} else {
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// reset the framerate
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yieldInterval = 5;
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}
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};
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var performWorkUntilDeadline = function () {
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if (scheduledHostCallback !== null) {
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var currentTime = exports.unstable_now(); // Yield after `yieldInterval` ms, regardless of where we are in the vsync
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// cycle. This means there's always time remaining at the beginning of
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// the message event.
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deadline = currentTime + yieldInterval;
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var hasTimeRemaining = true;
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try {
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var hasMoreWork = scheduledHostCallback(hasTimeRemaining, currentTime);
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if (!hasMoreWork) {
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isMessageLoopRunning = false;
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scheduledHostCallback = null;
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} else {
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// If there's more work, schedule the next message event at the end
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// of the preceding one.
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port.postMessage(null);
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}
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} catch (error) {
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// If a scheduler task throws, exit the current browser task so the
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// error can be observed.
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port.postMessage(null);
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throw error;
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}
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} else {
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isMessageLoopRunning = false;
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} // Yielding to the browser will give it a chance to paint, so we can
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};
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var channel = new MessageChannel();
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var port = channel.port2;
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channel.port1.onmessage = performWorkUntilDeadline;
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requestHostCallback = function (callback) {
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scheduledHostCallback = callback;
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if (!isMessageLoopRunning) {
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isMessageLoopRunning = true;
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port.postMessage(null);
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}
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};
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requestHostTimeout = function (callback, ms) {
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taskTimeoutID = _setTimeout(function () {
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callback(exports.unstable_now());
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}, ms);
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};
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cancelHostTimeout = function () {
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_clearTimeout(taskTimeoutID);
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taskTimeoutID = -1;
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};
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}
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function push(heap, node) {
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var index = heap.length;
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heap.push(node);
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siftUp(heap, node, index);
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}
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function peek(heap) {
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var first = heap[0];
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return first === undefined ? null : first;
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}
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function pop(heap) {
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var first = heap[0];
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if (first !== undefined) {
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var last = heap.pop();
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if (last !== first) {
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heap[0] = last;
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siftDown(heap, last, 0);
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}
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return first;
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} else {
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return null;
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}
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}
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function siftUp(heap, node, i) {
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var index = i;
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while (true) {
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var parentIndex = index - 1 >>> 1;
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var parent = heap[parentIndex];
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if (parent !== undefined && compare(parent, node) > 0) {
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// The parent is larger. Swap positions.
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heap[parentIndex] = node;
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heap[index] = parent;
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index = parentIndex;
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} else {
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// The parent is smaller. Exit.
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return;
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}
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}
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}
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function siftDown(heap, node, i) {
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var index = i;
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var length = heap.length;
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while (index < length) {
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var leftIndex = (index + 1) * 2 - 1;
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var left = heap[leftIndex];
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var rightIndex = leftIndex + 1;
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var right = heap[rightIndex]; // If the left or right node is smaller, swap with the smaller of those.
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if (left !== undefined && compare(left, node) < 0) {
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if (right !== undefined && compare(right, left) < 0) {
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heap[index] = right;
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heap[rightIndex] = node;
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index = rightIndex;
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} else {
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heap[index] = left;
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heap[leftIndex] = node;
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index = leftIndex;
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}
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} else if (right !== undefined && compare(right, node) < 0) {
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heap[index] = right;
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heap[rightIndex] = node;
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index = rightIndex;
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} else {
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// Neither child is smaller. Exit.
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return;
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}
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}
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}
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function compare(a, b) {
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// Compare sort index first, then task id.
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var diff = a.sortIndex - b.sortIndex;
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return diff !== 0 ? diff : a.id - b.id;
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}
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// TODO: Use symbols?
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var ImmediatePriority = 1;
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var UserBlockingPriority = 2;
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var NormalPriority = 3;
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var LowPriority = 4;
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var IdlePriority = 5;
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function markTaskErrored(task, ms) {
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}
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/* eslint-disable no-var */
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// Math.pow(2, 30) - 1
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// 0b111111111111111111111111111111
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var maxSigned31BitInt = 1073741823; // Times out immediately
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var IMMEDIATE_PRIORITY_TIMEOUT = -1; // Eventually times out
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var USER_BLOCKING_PRIORITY_TIMEOUT = 250;
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var NORMAL_PRIORITY_TIMEOUT = 5000;
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var LOW_PRIORITY_TIMEOUT = 10000; // Never times out
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var IDLE_PRIORITY_TIMEOUT = maxSigned31BitInt; // Tasks are stored on a min heap
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var taskQueue = [];
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var timerQueue = []; // Incrementing id counter. Used to maintain insertion order.
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var taskIdCounter = 1; // Pausing the scheduler is useful for debugging.
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var currentTask = null;
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var currentPriorityLevel = NormalPriority; // This is set while performing work, to prevent re-entrancy.
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var isPerformingWork = false;
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var isHostCallbackScheduled = false;
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var isHostTimeoutScheduled = false;
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function advanceTimers(currentTime) {
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// Check for tasks that are no longer delayed and add them to the queue.
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var timer = peek(timerQueue);
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while (timer !== null) {
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if (timer.callback === null) {
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// Timer was cancelled.
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pop(timerQueue);
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} else if (timer.startTime <= currentTime) {
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// Timer fired. Transfer to the task queue.
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pop(timerQueue);
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timer.sortIndex = timer.expirationTime;
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push(taskQueue, timer);
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} else {
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// Remaining timers are pending.
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return;
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}
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timer = peek(timerQueue);
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}
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}
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function handleTimeout(currentTime) {
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isHostTimeoutScheduled = false;
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advanceTimers(currentTime);
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if (!isHostCallbackScheduled) {
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if (peek(taskQueue) !== null) {
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isHostCallbackScheduled = true;
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requestHostCallback(flushWork);
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} else {
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var firstTimer = peek(timerQueue);
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if (firstTimer !== null) {
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requestHostTimeout(handleTimeout, firstTimer.startTime - currentTime);
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}
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}
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}
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}
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function flushWork(hasTimeRemaining, initialTime) {
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isHostCallbackScheduled = false;
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if (isHostTimeoutScheduled) {
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// We scheduled a timeout but it's no longer needed. Cancel it.
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isHostTimeoutScheduled = false;
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cancelHostTimeout();
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}
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isPerformingWork = true;
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var previousPriorityLevel = currentPriorityLevel;
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try {
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if (enableProfiling) {
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try {
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return workLoop(hasTimeRemaining, initialTime);
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} catch (error) {
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if (currentTask !== null) {
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var currentTime = exports.unstable_now();
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markTaskErrored(currentTask, currentTime);
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currentTask.isQueued = false;
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}
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throw error;
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}
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} else {
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// No catch in prod code path.
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return workLoop(hasTimeRemaining, initialTime);
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}
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} finally {
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currentTask = null;
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currentPriorityLevel = previousPriorityLevel;
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isPerformingWork = false;
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}
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}
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function workLoop(hasTimeRemaining, initialTime) {
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var currentTime = initialTime;
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advanceTimers(currentTime);
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currentTask = peek(taskQueue);
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while (currentTask !== null && !(enableSchedulerDebugging)) {
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if (currentTask.expirationTime > currentTime && (!hasTimeRemaining || exports.unstable_shouldYield())) {
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// This currentTask hasn't expired, and we've reached the deadline.
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break;
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}
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var callback = currentTask.callback;
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if (typeof callback === 'function') {
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currentTask.callback = null;
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currentPriorityLevel = currentTask.priorityLevel;
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var didUserCallbackTimeout = currentTask.expirationTime <= currentTime;
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var continuationCallback = callback(didUserCallbackTimeout);
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currentTime = exports.unstable_now();
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if (typeof continuationCallback === 'function') {
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currentTask.callback = continuationCallback;
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} else {
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if (currentTask === peek(taskQueue)) {
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pop(taskQueue);
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}
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}
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advanceTimers(currentTime);
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} else {
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pop(taskQueue);
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}
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currentTask = peek(taskQueue);
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} // Return whether there's additional work
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if (currentTask !== null) {
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return true;
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} else {
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var firstTimer = peek(timerQueue);
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if (firstTimer !== null) {
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requestHostTimeout(handleTimeout, firstTimer.startTime - currentTime);
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}
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return false;
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}
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}
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function unstable_runWithPriority(priorityLevel, eventHandler) {
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switch (priorityLevel) {
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case ImmediatePriority:
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case UserBlockingPriority:
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case NormalPriority:
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case LowPriority:
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case IdlePriority:
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break;
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default:
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priorityLevel = NormalPriority;
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}
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var previousPriorityLevel = currentPriorityLevel;
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currentPriorityLevel = priorityLevel;
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try {
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return eventHandler();
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} finally {
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currentPriorityLevel = previousPriorityLevel;
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}
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}
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function unstable_next(eventHandler) {
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var priorityLevel;
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switch (currentPriorityLevel) {
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case ImmediatePriority:
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case UserBlockingPriority:
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case NormalPriority:
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// Shift down to normal priority
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priorityLevel = NormalPriority;
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break;
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default:
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// Anything lower than normal priority should remain at the current level.
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priorityLevel = currentPriorityLevel;
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break;
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}
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var previousPriorityLevel = currentPriorityLevel;
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currentPriorityLevel = priorityLevel;
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try {
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return eventHandler();
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} finally {
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currentPriorityLevel = previousPriorityLevel;
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}
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}
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function unstable_wrapCallback(callback) {
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var parentPriorityLevel = currentPriorityLevel;
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return function () {
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// This is a fork of runWithPriority, inlined for performance.
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var previousPriorityLevel = currentPriorityLevel;
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currentPriorityLevel = parentPriorityLevel;
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try {
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return callback.apply(this, arguments);
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} finally {
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currentPriorityLevel = previousPriorityLevel;
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}
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};
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}
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function unstable_scheduleCallback(priorityLevel, callback, options) {
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var currentTime = exports.unstable_now();
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var startTime;
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if (typeof options === 'object' && options !== null) {
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var delay = options.delay;
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if (typeof delay === 'number' && delay > 0) {
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startTime = currentTime + delay;
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} else {
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startTime = currentTime;
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}
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} else {
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startTime = currentTime;
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}
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var timeout;
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switch (priorityLevel) {
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case ImmediatePriority:
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timeout = IMMEDIATE_PRIORITY_TIMEOUT;
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break;
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case UserBlockingPriority:
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timeout = USER_BLOCKING_PRIORITY_TIMEOUT;
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break;
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case IdlePriority:
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timeout = IDLE_PRIORITY_TIMEOUT;
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break;
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case LowPriority:
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timeout = LOW_PRIORITY_TIMEOUT;
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break;
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case NormalPriority:
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default:
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timeout = NORMAL_PRIORITY_TIMEOUT;
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break;
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}
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var expirationTime = startTime + timeout;
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var newTask = {
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id: taskIdCounter++,
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callback: callback,
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priorityLevel: priorityLevel,
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startTime: startTime,
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expirationTime: expirationTime,
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sortIndex: -1
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};
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if (startTime > currentTime) {
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// This is a delayed task.
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newTask.sortIndex = startTime;
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push(timerQueue, newTask);
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if (peek(taskQueue) === null && newTask === peek(timerQueue)) {
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// All tasks are delayed, and this is the task with the earliest delay.
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if (isHostTimeoutScheduled) {
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// Cancel an existing timeout.
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cancelHostTimeout();
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} else {
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isHostTimeoutScheduled = true;
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} // Schedule a timeout.
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requestHostTimeout(handleTimeout, startTime - currentTime);
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}
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} else {
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newTask.sortIndex = expirationTime;
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push(taskQueue, newTask);
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// wait until the next time we yield.
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if (!isHostCallbackScheduled && !isPerformingWork) {
|
|
isHostCallbackScheduled = true;
|
|
requestHostCallback(flushWork);
|
|
}
|
|
}
|
|
|
|
return newTask;
|
|
}
|
|
|
|
function unstable_pauseExecution() {
|
|
}
|
|
|
|
function unstable_continueExecution() {
|
|
|
|
if (!isHostCallbackScheduled && !isPerformingWork) {
|
|
isHostCallbackScheduled = true;
|
|
requestHostCallback(flushWork);
|
|
}
|
|
}
|
|
|
|
function unstable_getFirstCallbackNode() {
|
|
return peek(taskQueue);
|
|
}
|
|
|
|
function unstable_cancelCallback(task) {
|
|
// remove from the queue because you can't remove arbitrary nodes from an
|
|
// array based heap, only the first one.)
|
|
|
|
|
|
task.callback = null;
|
|
}
|
|
|
|
function unstable_getCurrentPriorityLevel() {
|
|
return currentPriorityLevel;
|
|
}
|
|
|
|
var unstable_requestPaint = requestPaint;
|
|
var unstable_Profiling = null;
|
|
|
|
exports.unstable_IdlePriority = IdlePriority;
|
|
exports.unstable_ImmediatePriority = ImmediatePriority;
|
|
exports.unstable_LowPriority = LowPriority;
|
|
exports.unstable_NormalPriority = NormalPriority;
|
|
exports.unstable_Profiling = unstable_Profiling;
|
|
exports.unstable_UserBlockingPriority = UserBlockingPriority;
|
|
exports.unstable_cancelCallback = unstable_cancelCallback;
|
|
exports.unstable_continueExecution = unstable_continueExecution;
|
|
exports.unstable_getCurrentPriorityLevel = unstable_getCurrentPriorityLevel;
|
|
exports.unstable_getFirstCallbackNode = unstable_getFirstCallbackNode;
|
|
exports.unstable_next = unstable_next;
|
|
exports.unstable_pauseExecution = unstable_pauseExecution;
|
|
exports.unstable_requestPaint = unstable_requestPaint;
|
|
exports.unstable_runWithPriority = unstable_runWithPriority;
|
|
exports.unstable_scheduleCallback = unstable_scheduleCallback;
|
|
exports.unstable_wrapCallback = unstable_wrapCallback;
|
|
})();
|
|
} |