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Filename : plain.js
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"use strict";

var callable      = require("es5-ext/object/valid-callable")
  , forEach       = require("es5-ext/object/for-each")
  , extensions    = require("./lib/registered-extensions")
  , configure     = require("./lib/configure-map")
  , resolveLength = require("./lib/resolve-length");

module.exports = function self(fn /*, options */) {
	var options, length, conf;

	callable(fn);
	options = Object(arguments[1]);

	if (options.async && options.promise) {
		throw new Error("Options 'async' and 'promise' cannot be used together");
	}

	// Do not memoize already memoized function
	if (hasOwnProperty.call(fn, "__memoized__") && !options.force) return fn;

	// Resolve length;
	length = resolveLength(options.length, fn.length, options.async && extensions.async);

	// Configure cache map
	conf = configure(fn, length, options);

	// Bind eventual extensions
	forEach(extensions, function (extFn, name) {
		if (options[name]) extFn(options[name], conf, options);
	});

	if (self.__profiler__) self.__profiler__(conf);

	conf.updateEnv();
	return conf.memoized;
};