635 lines
17 KiB
JavaScript
635 lines
17 KiB
JavaScript
/**
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* @license React
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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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/* global __REACT_DEVTOOLS_GLOBAL_HOOK__ */
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if (
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typeof __REACT_DEVTOOLS_GLOBAL_HOOK__ !== 'undefined' &&
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typeof __REACT_DEVTOOLS_GLOBAL_HOOK__.registerInternalModuleStart ===
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'function'
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) {
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__REACT_DEVTOOLS_GLOBAL_HOOK__.registerInternalModuleStart(new Error());
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}
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var enableSchedulerDebugging = false;
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var enableProfiling = false;
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var frameYieldMs = 5;
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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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return heap.length === 0 ? null : heap[0];
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}
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function pop(heap) {
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if (heap.length === 0) {
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return null;
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}
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var first = heap[0];
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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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}
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function siftUp(heap, node, i) {
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var index = i;
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while (index > 0) {
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var parentIndex = index - 1 >>> 1;
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var parent = heap[parentIndex];
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if (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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var halfLength = length >>> 1;
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while (index < halfLength) {
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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 (compare(left, node) < 0) {
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if (rightIndex < length && 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 (rightIndex < length && 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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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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} // Max 31 bit integer. The max integer size in V8 for 32-bit systems.
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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-entrance.
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var isPerformingWork = false;
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var isHostCallbackScheduled = false;
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var isHostTimeoutScheduled = false; // Capture local references to native APIs, in case a polyfill overrides them.
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var localSetTimeout = typeof setTimeout === 'function' ? setTimeout : null;
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var localClearTimeout = typeof clearTimeout === 'function' ? clearTimeout : null;
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var localSetImmediate = typeof setImmediate !== 'undefined' ? setImmediate : null; // IE and Node.js + jsdom
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var isInputPending = typeof navigator !== 'undefined' && navigator.scheduling !== undefined && navigator.scheduling.isInputPending !== undefined ? navigator.scheduling.isInputPending.bind(navigator.scheduling) : null;
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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 || shouldYieldToHost())) {
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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) {
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isHostCallbackScheduled = true;
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requestHostCallback(flushWork);
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}
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}
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return newTask;
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}
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function unstable_pauseExecution() {
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}
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function unstable_continueExecution() {
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if (!isHostCallbackScheduled && !isPerformingWork) {
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isHostCallbackScheduled = true;
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requestHostCallback(flushWork);
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}
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}
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function unstable_getFirstCallbackNode() {
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return peek(taskQueue);
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}
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function unstable_cancelCallback(task) {
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// remove from the queue because you can't remove arbitrary nodes from an
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// array based heap, only the first one.)
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task.callback = null;
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}
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function unstable_getCurrentPriorityLevel() {
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return currentPriorityLevel;
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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 frameInterval = frameYieldMs;
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var startTime = -1;
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function shouldYieldToHost() {
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var timeElapsed = exports.unstable_now() - startTime;
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if (timeElapsed < frameInterval) {
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// The main thread has only been blocked for a really short amount of time;
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// smaller than a single frame. Don't yield yet.
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return false;
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} // The main thread has been blocked for a non-negligible amount of time. We
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return true;
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}
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function requestPaint() {
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}
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function forceFrameRate(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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frameInterval = Math.floor(1000 / fps);
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} else {
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// reset the framerate
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frameInterval = frameYieldMs;
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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(); // Keep track of the start time so we can measure how long the main thread
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// has been blocked.
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startTime = currentTime;
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var hasTimeRemaining = true; // If a scheduler task throws, exit the current browser task so the
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// error can be observed.
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//
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// Intentionally not using a try-catch, since that makes some debugging
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// techniques harder. Instead, if `scheduledHostCallback` errors, then
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// `hasMoreWork` will remain true, and we'll continue the work loop.
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var hasMoreWork = true;
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try {
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hasMoreWork = scheduledHostCallback(hasTimeRemaining, currentTime);
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} finally {
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if (hasMoreWork) {
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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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schedulePerformWorkUntilDeadline();
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} else {
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isMessageLoopRunning = false;
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scheduledHostCallback = null;
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}
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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 schedulePerformWorkUntilDeadline;
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if (typeof localSetImmediate === 'function') {
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// Node.js and old IE.
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// There's a few reasons for why we prefer setImmediate.
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//
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// Unlike MessageChannel, it doesn't prevent a Node.js process from exiting.
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// (Even though this is a DOM fork of the Scheduler, you could get here
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// with a mix of Node.js 15+, which has a MessageChannel, and jsdom.)
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// https://github.com/facebook/react/issues/20756
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//
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// But also, it runs earlier which is the semantic we want.
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// If other browsers ever implement it, it's better to use it.
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// Although both of these would be inferior to native scheduling.
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schedulePerformWorkUntilDeadline = function () {
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localSetImmediate(performWorkUntilDeadline);
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};
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} else if (typeof MessageChannel !== 'undefined') {
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// DOM and Worker environments.
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// We prefer MessageChannel because of the 4ms setTimeout clamping.
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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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schedulePerformWorkUntilDeadline = function () {
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port.postMessage(null);
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};
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} else {
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// We should only fallback here in non-browser environments.
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schedulePerformWorkUntilDeadline = function () {
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localSetTimeout(performWorkUntilDeadline, 0);
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};
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}
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function requestHostCallback(callback) {
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scheduledHostCallback = callback;
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if (!isMessageLoopRunning) {
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isMessageLoopRunning = true;
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schedulePerformWorkUntilDeadline();
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}
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}
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function requestHostTimeout(callback, ms) {
|
|
taskTimeoutID = localSetTimeout(function () {
|
|
callback(exports.unstable_now());
|
|
}, ms);
|
|
}
|
|
|
|
function cancelHostTimeout() {
|
|
localClearTimeout(taskTimeoutID);
|
|
taskTimeoutID = -1;
|
|
}
|
|
|
|
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_forceFrameRate = forceFrameRate;
|
|
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_shouldYield = shouldYieldToHost;
|
|
exports.unstable_wrapCallback = unstable_wrapCallback;
|
|
/* global __REACT_DEVTOOLS_GLOBAL_HOOK__ */
|
|
if (
|
|
typeof __REACT_DEVTOOLS_GLOBAL_HOOK__ !== 'undefined' &&
|
|
typeof __REACT_DEVTOOLS_GLOBAL_HOOK__.registerInternalModuleStop ===
|
|
'function'
|
|
) {
|
|
__REACT_DEVTOOLS_GLOBAL_HOOK__.registerInternalModuleStop(new Error());
|
|
}
|
|
|
|
})();
|
|
}
|