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"use strict"; // rawAsap provides everything we need except exception management. var rawAsap = require("./raw"); // RawTasks are recycled to reduce GC churn. var freeTasks = []; // We queue errors to ensure they are thrown in right order (FIFO). // Array-as-queue is good enough here, since we are just dealing with exceptions. var pendingErrors = []; var requestErrorThrow = rawAsap.makeRequestCallFromTimer(throwFirstError); function throwFirstError() { if (pendingErrors.length) { throw pendingErrors.shift(); } } /** * Calls a task as soon as possible after returning, in its own event, with priority * over other events like animation, reflow, and repaint. An error thrown from an * event will not interrupt, nor even substantially slow down the processing of * other events, but will be rather postponed to a lower priority event. * @param {{call}} task A callable object, typically a function that takes no * arguments. */ module.exports = asap; function asap(task) { var rawTask; if (freeTasks.length) { rawTask = freeTasks.pop(); } else { rawTask = new RawTask(); } rawTask.task = task; rawAsap(rawTask); } // We wrap tasks with recyclable task objects. A task object implements // `call`, just like a function. function RawTask() { this.task = null; } // The sole purpose of wrapping the task is to catch the exception and recycle // the task object after its single use. RawTask.prototype.call = function () { try { this.task.call(); } catch (error) { if (asap.onerror) { // This hook exists purely for testing purposes. // Its name will be periodically randomized to break any code that // depends on its existence. asap.onerror(error); } else { // In a web browser, exceptions are not fatal. However, to avoid // slowing down the queue of pending tasks, we rethrow the error in a // lower priority turn. pendingErrors.push(error); requestErrorThrow(); } } finally { this.task = null; freeTasks[freeTasks.length] = this; } };