var global = require('../internals/global');
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var apply = require('../internals/function-apply');
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var bind = require('../internals/function-bind-context');
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var isCallable = require('../internals/is-callable');
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var hasOwn = require('../internals/has-own-property');
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var fails = require('../internals/fails');
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var html = require('../internals/html');
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var arraySlice = require('../internals/array-slice');
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var createElement = require('../internals/document-create-element');
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var validateArgumentsLength = require('../internals/validate-arguments-length');
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var IS_IOS = require('../internals/engine-is-ios');
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var IS_NODE = require('../internals/engine-is-node');
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var set = global.setImmediate;
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var clear = global.clearImmediate;
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var process = global.process;
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var Dispatch = global.Dispatch;
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var Function = global.Function;
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var MessageChannel = global.MessageChannel;
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var String = global.String;
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var counter = 0;
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var queue = {};
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var ONREADYSTATECHANGE = 'onreadystatechange';
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var location, defer, channel, port;
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try {
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// Deno throws a ReferenceError on `location` access without `--location` flag
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location = global.location;
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} catch (error) { /* empty */ }
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var run = function (id) {
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if (hasOwn(queue, id)) {
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var fn = queue[id];
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delete queue[id];
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fn();
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}
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};
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var runner = function (id) {
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return function () {
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run(id);
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};
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};
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var listener = function (event) {
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run(event.data);
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};
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var post = function (id) {
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// old engines have not location.origin
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global.postMessage(String(id), location.protocol + '//' + location.host);
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};
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// Node.js 0.9+ & IE10+ has setImmediate, otherwise:
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if (!set || !clear) {
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set = function setImmediate(handler) {
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validateArgumentsLength(arguments.length, 1);
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var fn = isCallable(handler) ? handler : Function(handler);
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var args = arraySlice(arguments, 1);
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queue[++counter] = function () {
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apply(fn, undefined, args);
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};
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defer(counter);
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return counter;
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};
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clear = function clearImmediate(id) {
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delete queue[id];
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};
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// Node.js 0.8-
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if (IS_NODE) {
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defer = function (id) {
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process.nextTick(runner(id));
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};
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// Sphere (JS game engine) Dispatch API
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} else if (Dispatch && Dispatch.now) {
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defer = function (id) {
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Dispatch.now(runner(id));
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};
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// Browsers with MessageChannel, includes WebWorkers
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// except iOS - https://github.com/zloirock/core-js/issues/624
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} else if (MessageChannel && !IS_IOS) {
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channel = new MessageChannel();
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port = channel.port2;
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channel.port1.onmessage = listener;
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defer = bind(port.postMessage, port);
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// Browsers with postMessage, skip WebWorkers
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// IE8 has postMessage, but it's sync & typeof its postMessage is 'object'
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} else if (
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global.addEventListener &&
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isCallable(global.postMessage) &&
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!global.importScripts &&
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location && location.protocol !== 'file:' &&
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!fails(post)
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) {
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defer = post;
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global.addEventListener('message', listener, false);
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// IE8-
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} else if (ONREADYSTATECHANGE in createElement('script')) {
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defer = function (id) {
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html.appendChild(createElement('script'))[ONREADYSTATECHANGE] = function () {
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html.removeChild(this);
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run(id);
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};
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};
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// Rest old browsers
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} else {
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defer = function (id) {
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setTimeout(runner(id), 0);
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};
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}
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}
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module.exports = {
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set: set,
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clear: clear
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};
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