97 lines
1.9 KiB
JavaScript
97 lines
1.9 KiB
JavaScript
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'use strict';
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var types = [
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require('./nextTick'),
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require('./mutation.js'),
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require('./messageChannel'),
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require('./stateChange'),
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require('./timeout')
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];
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var draining;
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var currentQueue;
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var queueIndex = -1;
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var queue = [];
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var scheduled = false;
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function cleanUpNextTick() {
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if (!draining || !currentQueue) {
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return;
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}
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draining = false;
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if (currentQueue.length) {
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queue = currentQueue.concat(queue);
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} else {
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queueIndex = -1;
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}
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if (queue.length) {
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nextTick();
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}
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}
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//named nextTick for less confusing stack traces
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function nextTick() {
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if (draining) {
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return;
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}
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scheduled = false;
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draining = true;
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var len = queue.length;
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var timeout = setTimeout(cleanUpNextTick);
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while (len) {
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currentQueue = queue;
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queue = [];
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while (currentQueue && ++queueIndex < len) {
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currentQueue[queueIndex].run();
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}
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queueIndex = -1;
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len = queue.length;
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}
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currentQueue = null;
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queueIndex = -1;
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draining = false;
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clearTimeout(timeout);
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}
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var scheduleDrain;
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var i = -1;
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var len = types.length;
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while (++i < len) {
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if (types[i] && types[i].test && types[i].test()) {
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scheduleDrain = types[i].install(nextTick);
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break;
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}
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}
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// v8 likes predictible objects
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function Item(fun, array) {
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this.fun = fun;
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this.array = array;
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}
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Item.prototype.run = function () {
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var fun = this.fun;
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var array = this.array;
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switch (array.length) {
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case 0:
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return fun();
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case 1:
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return fun(array[0]);
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case 2:
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return fun(array[0], array[1]);
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case 3:
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return fun(array[0], array[1], array[2]);
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default:
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return fun.apply(null, array);
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}
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};
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module.exports = immediate;
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function immediate(task) {
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var args = new Array(arguments.length - 1);
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if (arguments.length > 1) {
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for (var i = 1; i < arguments.length; i++) {
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args[i - 1] = arguments[i];
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}
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}
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queue.push(new Item(task, args));
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if (!scheduled && !draining) {
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scheduled = true;
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scheduleDrain();
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}
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}
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