# Code coverage report for RxJS/dist/cjs/util/Immediate.js

## Statements: 17.71% (17 / 96) Branches: 9.68% (3 / 31) Functions: 0% (0 / 23) Lines: 17.71% (17 / 96) Ignored: none

All files » RxJS/dist/cjs/util/ » Immediate.js

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     /**
    All credit for this helper goes to http://github.com/YuzuJS/setImmediate
    */
    'use strict';

    exports.__esModule = true;

    var _root = require('./root');

    var Immediate = {
        setImmediate: function setImmediate(x) {
            return 0;
        },
        clearImmediate: function clearImmediate(id) {}
    };
    exports.Immediate = Immediate;
    Eif (_root.root && _root.root.setImmediate) {
        Immediate.setImmediate = _root.root.setImmediate;
        Immediate.clearImmediate = _root.root.clearImmediate;
    } else {
        exports.Immediate = Immediate = (function (global, Immediate) {
            var nextHandle = 1,
                // Spec says greater than zero
            tasksByHandle = {},
                currentlyRunningATask = false,
                doc = global.document,
                setImmediate = undefined;
            // Don't get fooled by e.g. browserify environments.
            if (({}).toString.call(global.process) === '[object process]') {
                // For Node.js before 0.9
                setImmediate = installNextTickImplementation();
            } else if (canUsePostMessage()) {
                // For non-IE10 modern browsers
                setImmediate = installPostMessageImplementation();
            } else if (global.MessageChannel) {
                // For web workers, where supported
                setImmediate = installMessageChannelImplementation();
            } else if (doc && 'onreadystatechange' in doc.createElement('script')) {
                // For IE 6–8
                setImmediate = installReadyStateChangeImplementation();
            } else {
                // For older browsers
                setImmediate = installSetTimeoutImplementation();
            }
            Immediate.setImmediate = setImmediate;
            Immediate.clearImmediate = clearImmediate;
            return Immediate;
            function clearImmediate(handle) {
                delete tasksByHandle[handle];
            }
            function addFromSetImmediateArguments(args) {
                tasksByHandle[nextHandle] = partiallyApplied.apply(undefined, args);
                return nextHandle++;
            }
            // This function accepts the same arguments as setImmediate, but
            // returns a function that requires no arguments.
            function partiallyApplied(handler) {
                for (var _len = arguments.length, args = Array(_len > 1 ? _len - 1 : 0), _key = 1; _key < _len; _key++) {
                    args[_key - 1] = arguments[_key];
                }

                return function () {
                    if (typeof handler === 'function') {
                        handler.apply(undefined, args);
                    } else {
                        new Function('' + handler)();
                    }
                };
            }
            function runIfPresent(handle) {
                // From the spec: 'Wait until any invocations of this algorithm started before this one have completed.'
                // So if we're currently running a task, we'll need to delay this invocation.
                if (currentlyRunningATask) {
                    // Delay by doing a setTimeout. setImmediate was tried instead, but in Firefox 7 it generated a
                    // 'too much recursion' error.
                    setTimeout(partiallyApplied(runIfPresent, handle), 0);
                } else {
                    var task = tasksByHandle[handle];
                    if (task) {
                        currentlyRunningATask = true;
                        try {
                            task();
                        } finally {
                            clearImmediate(handle);
                            currentlyRunningATask = false;
                        }
                    }
                }
            }
            function installNextTickImplementation() {
                return function setImmediate() {
                    var handle = addFromSetImmediateArguments(arguments);
                    global.process.nextTick(partiallyApplied(runIfPresent, handle));
                    return handle;
                };
            }
            function canUsePostMessage() {
                // The test against `importScripts` prevents this implementation from being installed inside a web worker,
                // where `global.postMessage` means something completely different and can't be used for this purpose.
                if (global.postMessage && !global.importScripts) {
                    var postMessageIsAsynchronous = true;
                    var oldOnMessage = global.onmessage;
                    global.onmessage = function () {
                        postMessageIsAsynchronous = false;
                    };
                    global.postMessage('', '*');
                    global.onmessage = oldOnMessage;
                    return postMessageIsAsynchronous;
                }
            }
            function installPostMessageImplementation() {
                // Installs an event handler on `global` for the `message` event: see
                // * https://developer.mozilla.org/en/DOM/window.postMessage
                // * http://www.whatwg.org/specs/web-apps/current-work/multipage/comms.html#crossDocumentMessages
                var messagePrefix = 'setImmediate$' + Math.random() + '$';
                var onGlobalMessage = function onGlobalMessage(event) {
                    if (event.source === global && typeof event.data === 'string' && event.data.indexOf(messagePrefix) === 0) {
                        runIfPresent(+event.data.slice(messagePrefix.length));
                    }
                };
                if (global.addEventListener) {
                    global.addEventListener('message', onGlobalMessage, false);
                } else {
                    global.attachEvent('onmessage', onGlobalMessage);
                }
                return function setImmediate() {
                    var handle = addFromSetImmediateArguments(arguments);
                    global.postMessage(messagePrefix + handle, '*');
                    return handle;
                };
            }
            function installMessageChannelImplementation() {
                var channel = new MessageChannel();
                channel.port1.onmessage = function (event) {
                    var handle = event.data;
                    runIfPresent(handle);
                };
                return function setImmediate() {
                    var handle = addFromSetImmediateArguments(arguments);
                    channel.port2.postMessage(handle);
                    return handle;
                };
            }
            function installReadyStateChangeImplementation() {
                var html = doc.documentElement;
                return function setImmediate() {
                    var handle = addFromSetImmediateArguments(arguments);
                    // Create a <script> element; its readystatechange event will be fired asynchronously once it is inserted
                    // into the document. Do so, thus queuing up the task. Remember to clean up once it's been called.
                    var script = doc.createElement('script');
                    script.onreadystatechange = function () {
                        runIfPresent(handle);
                        script.onreadystatechange = null;
                        html.removeChild(script);
                        script = null;
                    };
                    html.appendChild(script);
                    return handle;
                };
            }
            function installSetTimeoutImplementation() {
                return function setImmediate() {
                    var handle = addFromSetImmediateArguments(arguments);
                    setTimeout(partiallyApplied(runIfPresent, handle), 0);
                    return handle;
                };
            }
        })(_root.root, Immediate);
    }