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-
- var getNative = require('lodash._getnative'),
- isArguments = require('lodash.isarguments'),
- isArray = require('lodash.isarray');
-
-
- var reIsUint = /^\d+$/;
-
-
- var objectProto = Object.prototype;
-
-
- var hasOwnProperty = objectProto.hasOwnProperty;
-
-
- var nativeKeys = getNative(Object, 'keys');
-
-
- var MAX_SAFE_INTEGER = 9007199254740991;
-
-
- function baseProperty(key) {
- return function(object) {
- return object == null ? undefined : object[key];
- };
- }
-
-
- var getLength = baseProperty('length');
-
-
- function isArrayLike(value) {
- return value != null && isLength(getLength(value));
- }
-
-
- 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;
- }
-
-
- function isLength(value) {
- return typeof value == 'number' && value > -1 && value % 1 == 0 && value <= MAX_SAFE_INTEGER;
- }
-
-
- 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;
- }
-
-
- function isObject(value) {
-
-
- var type = typeof value;
- return !!value && (type == 'object' || type == 'function');
- }
-
-
- 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) : [];
- };
-
-
- 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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