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/**
* lodash 3.1.2 (Custom Build) <https://lodash.com/>
* Build: `lodash modern modularize exports="npm" -o ./`
* Copyright 2012-2015 The Dojo Foundation <http://dojofoundation.org/>
* Based on Underscore.js 1.8.3 <http://underscorejs.org/LICENSE>
* Copyright 2009-2015 Jeremy Ashkenas, DocumentCloud and Investigative Reporters & Editors
* Available under MIT license <https://lodash.com/license>
*/
var getNative = require('lodash._getnative'),
isArguments = require('lodash.isarguments'),
isArray = require('lodash.isarray');
/** Used to detect unsigned integer values. */
var reIsUint = /^\d+$/;
/** Used for native method references. */
var objectProto = Object.prototype;
/** Used to check objects for own properties. */
var hasOwnProperty = objectProto.hasOwnProperty;
/* Native method references for those with the same name as other `lodash` methods. */
var nativeKeys = getNative(Object, 'keys');
/**
* Used as the [maximum length](http://ecma-international.org/ecma-262/6.0/#sec-number.max_safe_integer)
* of an array-like value.
*/
var MAX_SAFE_INTEGER = 9007199254740991;
/**
* The base implementation of `_.property` without support for deep paths.
*
* @private
* @param {string} key The key of the property to get.
* @returns {Function} Returns the new function.
*/
function baseProperty(key) {
return function(object) {
return object == null ? undefined : object[key];
};
}
/**
* Gets the "length" property value of `object`.
*
* **Note:** This function is used to avoid a [JIT bug](https://bugs.webkit.org/show_bug.cgi?id=142792)
* that affects Safari on at least iOS 8.1-8.3 ARM64.
*
* @private
* @param {Object} object The object to query.
* @returns {*} Returns the "length" value.
*/
var getLength = baseProperty('length');
/**
* Checks if `value` is array-like.
*
* @private
* @param {*} value The value to check.
* @returns {boolean} Returns `true` if `value` is array-like, else `false`.
*/
function isArrayLike(value) {
return value != null && isLength(getLength(value));
}
/**
* Checks if `value` is a valid array-like index.
*
* @private
* @param {*} value The value to check.
* @param {number} [length=MAX_SAFE_INTEGER] The upper bounds of a valid index.
* @returns {boolean} Returns `true` if `value` is a valid index, else `false`.
*/
function isIndex(value, length) {
value = (typeof value == 'number' || reIsUint.test(value)) ? +value : -1;
length = length == null ? MAX_SAFE_INTEGER : length;
return value > -1 && value % 1 == 0 && value < length;
}
/**
* Checks if `value` is a valid array-like length.
*
* **Note:** This function is based on [`ToLength`](http://ecma-international.org/ecma-262/6.0/#sec-tolength).
*
* @private
* @param {*} value The value to check.
* @returns {boolean} Returns `true` if `value` is a valid length, else `false`.
*/
function isLength(value) {
return typeof value == 'number' && value > -1 && value % 1 == 0 && value <= MAX_SAFE_INTEGER;
}
/**
* A fallback implementation of `Object.keys` which creates an array of the
* own enumerable property names of `object`.
*
* @private
* @param {Object} object The object to query.
* @returns {Array} Returns the array of property names.
*/
function shimKeys(object) {
var props = keysIn(object),
propsLength = props.length,
length = propsLength && object.length;
var allowIndexes = !!length && isLength(length) &&
(isArray(object) || isArguments(object));
var index = -1,
result = [];
while (++index < propsLength) {
var key = props[index];
if ((allowIndexes && isIndex(key, length)) || hasOwnProperty.call(object, key)) {
result.push(key);
}
}
return result;
}
/**
* Checks if `value` is the [language type](https://es5.github.io/#x8) of `Object`.
* (e.g. arrays, functions, objects, regexes, `new Number(0)`, and `new String('')`)
*
* @static
* @memberOf _
* @category Lang
* @param {*} value The value to check.
* @returns {boolean} Returns `true` if `value` is an object, else `false`.
* @example
*
* _.isObject({});
* // => true
*
* _.isObject([1, 2, 3]);
* // => true
*
* _.isObject(1);
* // => false
*/
function isObject(value) {
// Avoid a V8 JIT bug in Chrome 19-20.
// See https://code.google.com/p/v8/issues/detail?id=2291 for more details.
var type = typeof value;
return !!value && (type == 'object' || type == 'function');
}
/**
* Creates an array of the own enumerable property names of `object`.
*
* **Note:** Non-object values are coerced to objects. See the
* [ES spec](http://ecma-international.org/ecma-262/6.0/#sec-object.keys)
* for more details.
*
* @static
* @memberOf _
* @category Object
* @param {Object} object The object to query.
* @returns {Array} Returns the array of property names.
* @example
*
* function Foo() {
* this.a = 1;
* this.b = 2;
* }
*
* Foo.prototype.c = 3;
*
* _.keys(new Foo);
* // => ['a', 'b'] (iteration order is not guaranteed)
*
* _.keys('hi');
* // => ['0', '1']
*/
var keys = !nativeKeys ? shimKeys : function(object) {
var Ctor = object == null ? undefined : object.constructor;
if ((typeof Ctor == 'function' && Ctor.prototype === object) ||
(typeof object != 'function' && isArrayLike(object))) {
return shimKeys(object);
}
return isObject(object) ? nativeKeys(object) : [];
};
/**
* Creates an array of the own and inherited enumerable property names of `object`.
*
* **Note:** Non-object values are coerced to objects.
*
* @static
* @memberOf _
* @category Object
* @param {Object} object The object to query.
* @returns {Array} Returns the array of property names.
* @example
*
* function Foo() {
* this.a = 1;
* this.b = 2;
* }
*
* Foo.prototype.c = 3;
*
* _.keysIn(new Foo);
* // => ['a', 'b', 'c'] (iteration order is not guaranteed)
*/
function keysIn(object) {
if (object == null) {
return [];
}
if (!isObject(object)) {
object = Object(object);
}
var length = object.length;
length = (length && isLength(length) &&
(isArray(object) || isArguments(object)) && length) || 0;
var Ctor = object.constructor,
index = -1,
isProto = typeof Ctor == 'function' && Ctor.prototype === object,
result = Array(length),
skipIndexes = length > 0;
while (++index < length) {
result[index] = (index + '');
}
for (var key in object) {
if (!(skipIndexes && isIndex(key, length)) &&
!(key == 'constructor' && (isProto || !hasOwnProperty.call(object, key)))) {
result.push(key);
}
}
return result;
}
module.exports = keys;
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