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var arrayCopy = require('../internal/arrayCopy'),
baseFunctions = require('../internal/baseFunctions'),
isFunction = require('../lang/isFunction'),
isObject = require('../lang/isObject'),
keys = require('../object/keys');
/** Used for native method references. */
var arrayProto = Array.prototype;
/** Native method references. */
var push = arrayProto.push;
/**
* Adds all own enumerable function properties of a source object to the
* destination object. If `object` is a function then methods are added to
* its prototype as well.
*
* **Note:** Use `_.runInContext` to create a pristine `lodash` function to
* avoid conflicts caused by modifying the original.
*
* @static
* @memberOf _
* @category Utility
* @param {Function|Object} [object=lodash] The destination object.
* @param {Object} source The object of functions to add.
* @param {Object} [options] The options object.
* @param {boolean} [options.chain=true] Specify whether the functions added
* are chainable.
* @returns {Function|Object} Returns `object`.
* @example
*
* function vowels(string) {
* return _.filter(string, function(v) {
* return /[aeiou]/i.test(v);
* });
* }
*
* // use `_.runInContext` to avoid conflicts (esp. in Node.js)
* var _ = require('lodash').runInContext();
*
* _.mixin({ 'vowels': vowels });
* _.vowels('fred');
* // => ['e']
*
* _('fred').vowels().value();
* // => ['e']
*
* _.mixin({ 'vowels': vowels }, { 'chain': false });
* _('fred').vowels();
* // => ['e']
*/
function mixin(object, source, options) {
var methodNames = baseFunctions(source, keys(source));
var chain = true,
index = -1,
isFunc = isFunction(object),
length = methodNames.length;
if (options === false) {
chain = false;
} else if (isObject(options) && 'chain' in options) {
chain = options.chain;
}
while (++index < length) {
var methodName = methodNames[index],
func = source[methodName];
object[methodName] = func;
if (isFunc) {
object.prototype[methodName] = (function(func) {
return function() {
var chainAll = this.__chain__;
if (chain || chainAll) {
var result = object(this.__wrapped__),
actions = result.__actions__ = arrayCopy(this.__actions__);
actions.push({ 'func': func, 'args': arguments, 'thisArg': object });
result.__chain__ = chainAll;
return result;
}
var args = [this.value()];
push.apply(args, arguments);
return func.apply(object, args);
};
}(func));
}
}
return object;
}
module.exports = mixin;
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