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rOACCT/node_modules/scheduler/cjs/scheduler-unstable_post_task.development.js
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scheduler-unstable_post_task.development.js
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/** @license React v0.20.1
* scheduler-unstable_post_task.development.js
*
* Copyright (c) Facebook, Inc. and its affiliates.
*
* This source code is licensed under the MIT license found in the
* LICENSE file in the root directory of this source tree.
*/
'use strict';
if (process.env.NODE_ENV !== "production") {
(function() {
'use strict';
// TODO: Use symbols?
var ImmediatePriority = 1;
var UserBlockingPriority = 2;
var NormalPriority = 3;
var LowPriority = 4;
var IdlePriority = 5;
var perf = window.performance;
var setTimeout = window.setTimeout; // Use experimental Chrome Scheduler postTask API.
var scheduler = global.scheduler;
var getCurrentTime = perf.now.bind(perf);
var unstable_now = getCurrentTime; // Scheduler periodically yields in case there is other work on the main
// thread, like user events. By default, it yields multiple times per frame.
// It does not attempt to align with frame boundaries, since most tasks don't
// need to be frame aligned; for those that do, use requestAnimationFrame.
var yieldInterval = 5;
var deadline = 0;
var currentPriorityLevel_DEPRECATED = NormalPriority; // `isInputPending` is not available. Since we have no way of knowing if
// there's pending input, always yield at the end of the frame.
function unstable_shouldYield() {
return getCurrentTime() >= deadline;
}
function unstable_requestPaint() {// Since we yield every frame regardless, `requestPaint` has no effect.
}
function unstable_scheduleCallback(priorityLevel, callback, options) {
var postTaskPriority;
switch (priorityLevel) {
case ImmediatePriority:
case UserBlockingPriority:
postTaskPriority = 'user-blocking';
break;
case LowPriority:
case NormalPriority:
postTaskPriority = 'user-visible';
break;
case IdlePriority:
postTaskPriority = 'background';
break;
default:
postTaskPriority = 'user-visible';
break;
}
var controller = new TaskController();
var postTaskOptions = {
priority: postTaskPriority,
delay: typeof options === 'object' && options !== null ? options.delay : 0,
signal: controller.signal
};
var node = {
_controller: controller
};
scheduler.postTask(runTask.bind(null, priorityLevel, postTaskPriority, node, callback), postTaskOptions).catch(handleAbortError);
return node;
}
function runTask(priorityLevel, postTaskPriority, node, callback) {
deadline = getCurrentTime() + yieldInterval;
try {
currentPriorityLevel_DEPRECATED = priorityLevel;
var _didTimeout_DEPRECATED = false;
var result = callback(_didTimeout_DEPRECATED);
if (typeof result === 'function') {
// Assume this is a continuation
var continuation = result;
var continuationController = new TaskController();
var continuationOptions = {
priority: postTaskPriority,
signal: continuationController.signal
}; // Update the original callback node's controller, since even though we're
// posting a new task, conceptually it's the same one.
node._controller = continuationController;
scheduler.postTask(runTask.bind(null, priorityLevel, postTaskPriority, node, continuation), continuationOptions).catch(handleAbortError);
}
} catch (error) {
// We're inside a `postTask` promise. If we don't handle this error, then it
// will trigger an "Unhandled promise rejection" error. We don't want that,
// but we do want the default error reporting behavior that normal
// (non-Promise) tasks get for unhandled errors.
//
// So we'll re-throw the error inside a regular browser task.
setTimeout(function () {
throw error;
});
} finally {
currentPriorityLevel_DEPRECATED = NormalPriority;
}
}
function handleAbortError(error) {// Abort errors are an implementation detail. We don't expose the
// TaskController to the user, nor do we expose the promise that is returned
// from `postTask`. So we should suppress them, since there's no way for the
// user to handle them.
}
function unstable_cancelCallback(node) {
var controller = node._controller;
controller.abort();
}
function unstable_runWithPriority(priorityLevel, callback) {
var previousPriorityLevel = currentPriorityLevel_DEPRECATED;
currentPriorityLevel_DEPRECATED = priorityLevel;
try {
return callback();
} finally {
currentPriorityLevel_DEPRECATED = previousPriorityLevel;
}
}
function unstable_getCurrentPriorityLevel() {
return currentPriorityLevel_DEPRECATED;
}
function unstable_next(callback) {
var priorityLevel;
switch (currentPriorityLevel_DEPRECATED) {
case ImmediatePriority:
case UserBlockingPriority:
case NormalPriority:
// Shift down to normal priority
priorityLevel = NormalPriority;
break;
default:
// Anything lower than normal priority should remain at the current level.
priorityLevel = currentPriorityLevel_DEPRECATED;
break;
}
var previousPriorityLevel = currentPriorityLevel_DEPRECATED;
currentPriorityLevel_DEPRECATED = priorityLevel;
try {
return callback();
} finally {
currentPriorityLevel_DEPRECATED = previousPriorityLevel;
}
}
function unstable_wrapCallback(callback) {
var parentPriorityLevel = currentPriorityLevel_DEPRECATED;
return function () {
var previousPriorityLevel = currentPriorityLevel_DEPRECATED;
currentPriorityLevel_DEPRECATED = parentPriorityLevel;
try {
return callback();
} finally {
currentPriorityLevel_DEPRECATED = previousPriorityLevel;
}
};
}
function unstable_forceFrameRate() {}
function unstable_pauseExecution() {}
function unstable_continueExecution() {}
function unstable_getFirstCallbackNode() {
return null;
} // Currently no profiling build
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 = unstable_forceFrameRate;
exports.unstable_getCurrentPriorityLevel = unstable_getCurrentPriorityLevel;
exports.unstable_getFirstCallbackNode = unstable_getFirstCallbackNode;
exports.unstable_next = unstable_next;
exports.unstable_now = unstable_now;
exports.unstable_pauseExecution = unstable_pauseExecution;
exports.unstable_requestPaint = unstable_requestPaint;
exports.unstable_runWithPriority = unstable_runWithPriority;
exports.unstable_scheduleCallback = unstable_scheduleCallback;
exports.unstable_shouldYield = unstable_shouldYield;
exports.unstable_wrapCallback = unstable_wrapCallback;
})();
}
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