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✏️ Editing: jsonp-debug.js

YUI.add('jsonp', function (Y, NAME) {

/*jslint maxlen: 350 */
var isFunction = Y.Lang.isFunction;

/**
 * Provides a JSONPRequest class for repeated JSONP calls, and a convenience
 * method Y.jsonp(url, callback) to instantiate and send a JSONP request.
 *
 * Both the constructor as well as the convenience function take two
 * parameters: a url string and a callback.
 *
 * The url provided must include the placeholder string
 * &quot;{callback}&quot; which will be replaced by a dynamically
 * generated routing function to pass the data to your callback function.
 * An example url might look like
 * &quot;http://example.com/service?callback={callback}&quot;.
 *
 * The second parameter can be a callback function that accepts the JSON
 * payload as its argument, or a configuration object supporting the keys:
 * <ul>
 * <li>on - map of callback subscribers
 * <ul>
 * <li>success - function handler for successful transmission</li>
 * <li>failure - function handler for failed transmission</li>
 * <li>timeout - function handler for transactions that timeout</li>
 * </ul>
 * </li>
 * <li>format - override function for inserting the proxy name in the url</li>
 * <li>timeout - the number of milliseconds to wait before giving up</li>
 * <li>context - becomes <code>this</code> in the callbacks</li>
 * <li>args - array of subsequent parameters to pass to the callbacks</li>
 * <li>allowCache - use the same proxy name for all requests? (boolean)</li>
 * </ul>
 *
 * @module jsonp
 * @class JSONPRequest
 * @constructor
 * @param url {String} the url of the JSONP service
 * @param callback {Object|Function} the default callback configuration or
 * success handler
 */
function JSONPRequest() {
 this._init.apply(this, arguments);
}

JSONPRequest.prototype = {
    /**
     * Set up the success and failure handlers and the regex pattern used
     * to insert the temporary callback name in the url.
     *
     * @method _init
     * @param url {String} the url of the JSONP service
     * @param callback {Object|Function} Optional success callback or config
     *                  object containing success and failure functions and
     *                  the url regex.
     * @protected
     */
    _init : function (url, callback) {
        this.url = url;

/**
         * Map of the number of requests currently pending responses per
         * generated proxy.  Used to ensure the proxy is not flushed if the
         * request times out and there is a timeout handler and success
         * handler, and used by connections configured to allowCache to make
         * sure the proxy isn't deleted until the last response has returned.
         *
         * @property _requests
         * @private
         * @type {Object}
         */
        this._requests = {};

/**
         * Map of the number of timeouts received from the destination url
         * by generated proxy.  Used to ensure the proxy is not flushed if the
         * request times out and there is a timeout handler and success
         * handler, and used by connections configured to allowCache to make
         * sure the proxy isn't deleted until the last response has returned.
         *
         * @property _timeouts
         * @private
         * @type {Object}
         */
        this._timeouts = {};

this._failures = {};

// Accept a function, an object, or nothing
        callback = (isFunction(callback)) ?
            { on: { success: callback } } :
            callback || {};

var subs = callback.on || {};

if (!subs.success) {
            subs.success = this._defaultCallback(url, callback);
        }

// Apply defaults and store
        this._config = Y.merge({
                context: this,
                args   : [],
                format : this._format,
                allowCache: false
            }, callback, { on: subs });
    },

/**
     * Override this method to provide logic to default the success callback if
     * it is not provided at construction.  This is overridden by jsonp-url to
     * parse the callback from the url string.
     *
     * @method _defaultCallback
     * @param url {String} the url passed at construction
     * @param config {Object} (optional) the config object passed at
     *                        construction
     * @return {Function}
     */
    _defaultCallback: function () {},

/**
     * Issues the JSONP request.
     *
     * @method send
     * @param args* {any} any additional arguments to pass to the url formatter
     *              beyond the base url and the proxy function name
     * @chainable
     */
    send : function () {
        var self   = this,
            args   = Y.Array(arguments, 0, true),
            config = self._config,
            proxy  = self._proxy || Y.guid(),
            url;

// TODO: support allowCache as time value
        if (config.allowCache) {
            self._proxy = proxy;
        }

if (self._requests[proxy] === undefined) {
            self._requests[proxy] = 0;
        }
        if (self._timeouts[proxy] === undefined) {
            self._timeouts[proxy] = 0;
        }
        if (self._failures[proxy] === undefined) {
            self._failures[proxy] = 0;
        }
        self._requests[proxy]++;

Y.log('sending ' + proxy);

args.unshift(self.url, 'YUI.Env.JSONP.' + proxy);
        url = config.format.apply(self, args);

if (!config.on.success) {
            Y.log("No success handler defined.  Aborting JSONP request.", "warn", "jsonp");
            return self;
        }

function wrap(fn, isTimeout, isFailure) {
            return (isFunction(fn)) ?
                function (data) {
                    var execute = true,
                        counter = '_requests';

//if (config.allowCache) {
                        // A lot of wrangling to make sure timeouts result in
                        // fewer success callbacks, but the proxy is properly
                        // cleaned up.
                        if (isTimeout) {
                            ++self._timeouts[proxy];
                            --self._requests[proxy];
                            Y.log(proxy + ' timed out - timeouts(' + self._timeouts[proxy] + ') failures(' + self._failures[proxy] + ') requests(' + self._requests[proxy] + ')');
                        } else if (isFailure) {
                            ++self._failures[proxy];
                            if (self._timeouts[proxy] > 0) {
                                --self._timeouts[proxy];
                            } else {
                                --self._requests[proxy];
                            }
                            Y.log(proxy + ' failure - timeouts(' + self._timeouts[proxy] + ') failures(' + self._failures[proxy] + ') requests(' + self._requests[proxy] + ')');
                        } else {
                            if (!self._requests[proxy]) {
                                execute = false;
                                if (self._timeouts[proxy] > 0) {
                                    counter = '_timeouts';
                                } else if (self._failures[proxy] > 0) {
                                    counter = '_failures';
                                }
                            }
                            --self[counter][proxy];
                            Y.log(proxy + ' response received - timeouts(' + self._timeouts[proxy] + ') failures(' + self._failures[proxy] + ') requests(' + self._requests[proxy] + ')');
                        }
                    //}

if (!self._requests[proxy] && !self._timeouts[proxy] && !self._failures[proxy]) {
                        Y.log('deleting ' + proxy);
                        delete YUI.Env.JSONP[proxy];
                    }

if (execute) {
                        fn.apply(config.context, [data].concat(config.args));
                    }
                } :
                null;
        }

// Temporary un-sandboxed function alias
        // TODO: queuing
        YUI.Env.JSONP[proxy] = wrap(config.on.success);

// Y.Get transactions block each other by design, but can easily
        //  be made non-blocking by just calling execute() on the transaction.
        // https://github.com/yui/yui3/pull/393#issuecomment-11961608
        Y.Get.js(url, {
            onFailure : wrap(config.on.failure, false, true),
            onTimeout : wrap(config.on.timeout, true, false),
            timeout   : config.timeout,
            charset   : config.charset,
            attributes: config.attributes,
            async     : config.async
        }).execute();

return self;
    },

/**
     * Default url formatter.  Looks for callback= in the url and appends it
     * if not present.  The supplied proxy name will be assigned to the query
     * param.  Override this method by passing a function as the
     * &quot;format&quot; property in the config object to the constructor.
     *
     * @method _format
     * @param url { String } the original url
     * @param proxy {String} the function name that will be used as a proxy to
     *      the configured callback methods.
     * @param args* {any} additional args passed to send()
     * @return {String} fully qualified JSONP url
     * @protected
     */
    _format: function (url, proxy) {
        return url.replace(/\{callback\}/, proxy);
    }
};

Y.JSONPRequest = JSONPRequest;

/**
 *
 * @method jsonp
 * @param url {String} the url of the JSONP service with the {callback}
 *          placeholder where the callback function name typically goes.
 * @param c {Function|Object} Callback function accepting the JSON payload
 *          as its argument, or a configuration object (see above).
 * @param args* {any} additional arguments to pass to send()
 * @return {JSONPRequest}
 * @static
 * @for YUI
 */
Y.jsonp = function (url,c) {
    var req = new Y.JSONPRequest(url,c);
    return req.send.apply(req, Y.Array(arguments, 2, true));
};

if (!YUI.Env.JSONP) {
    YUI.Env.JSONP = {};
}

}, '3.18.1', {"requires": ["get", "oop"]});

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