when/lib/apply.js

/** @license MIT License (c) copyright 2010-2014 original author or authors */
/** @author Brian Cavalier */
/** @author John Hann */

(function(define) { 'use strict';
define(function() {

	makeApply.tryCatchResolve = tryCatchResolve;

	return makeApply;

	function makeApply(Promise, call) {
		if(arguments.length < 2) {
			call = tryCatchResolve;
		}

		return apply;

		function apply(f, thisArg, args) {
			var p = Promise._defer();
			var l = args.length;
			var params = new Array(l);
			callAndResolve({ f:f, thisArg:thisArg, args:args, params:params, i:l-1, call:call }, p._handler);

			return p;
		}

		function callAndResolve(c, h) {
			if(c.i < 0) {
				return call(c.f, c.thisArg, c.params, h);
			}

			var handler = Promise._handler(c.args[c.i]);
			handler.fold(callAndResolveNext, c, void 0, h);
		}

		function callAndResolveNext(c, x, h) {
			c.params[c.i] = x;
			c.i -= 1;
			callAndResolve(c, h);
		}
	}

	function tryCatchResolve(f, thisArg, args, resolver) {
		try {
			resolver.resolve(f.apply(thisArg, args));
		} catch(e) {
			resolver.reject(e);
		}
	}

});
}(typeof define === 'function' && define.amd ? define : function(factory) { module.exports = factory(); }));