ZeptoのajaxをなんとなくFutureのpolyfill仕立てにする

zepto_with_future.js

/**
 * @see https://github.com/slightlyoff/Futures
 */
(function(Future, DollarLib) {
  'use strict';

  function _wrap(func, wrapper) {
    return function() {
      return wrapper.apply(this, [func].concat(Array.prototype.slice.call(arguments, 0)));
    };
  }

  function _wrapCallback(wrapOf, resolverFunc) {
    return _wrap(wrapOf, function() {
      var origCallback = arguments[0], args = Array.prototype.slice.call(arguments, 1);

      if (origCallback) {
        origCallback.apply(null, args);
      }
      return resolverFunc.apply(null, args);
    });
  }

  DollarLib.ajax = _wrap(DollarLib.ajax, function(origAjax, options) {
    return new Future(function(resolver) {
      options || (options = {});
      options.success = _wrapCallback(options.success, resolver.resolve);
      options.error   = _wrapCallback(options.error, resolver.reject);
      origAjax(options);
    });
  });

})(Future, $);