132 lines
3.7 KiB
JavaScript
132 lines
3.7 KiB
JavaScript
/**
|
|
* lodash 3.1.4 (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 isArguments = require('lodash.isarguments'),
|
|
isArray = require('lodash.isarray');
|
|
|
|
/**
|
|
* Checks if `value` is object-like.
|
|
*
|
|
* @private
|
|
* @param {*} value The value to check.
|
|
* @returns {boolean} Returns `true` if `value` is object-like, else `false`.
|
|
*/
|
|
function isObjectLike(value) {
|
|
return !!value && typeof value == 'object';
|
|
}
|
|
|
|
/**
|
|
* 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;
|
|
|
|
/**
|
|
* Appends the elements of `values` to `array`.
|
|
*
|
|
* @private
|
|
* @param {Array} array The array to modify.
|
|
* @param {Array} values The values to append.
|
|
* @returns {Array} Returns `array`.
|
|
*/
|
|
function arrayPush(array, values) {
|
|
var index = -1,
|
|
length = values.length,
|
|
offset = array.length;
|
|
|
|
while (++index < length) {
|
|
array[offset + index] = values[index];
|
|
}
|
|
return array;
|
|
}
|
|
|
|
/**
|
|
* The base implementation of `_.flatten` with added support for restricting
|
|
* flattening and specifying the start index.
|
|
*
|
|
* @private
|
|
* @param {Array} array The array to flatten.
|
|
* @param {boolean} [isDeep] Specify a deep flatten.
|
|
* @param {boolean} [isStrict] Restrict flattening to arrays-like objects.
|
|
* @param {Array} [result=[]] The initial result value.
|
|
* @returns {Array} Returns the new flattened array.
|
|
*/
|
|
function baseFlatten(array, isDeep, isStrict, result) {
|
|
result || (result = []);
|
|
|
|
var index = -1,
|
|
length = array.length;
|
|
|
|
while (++index < length) {
|
|
var value = array[index];
|
|
if (isObjectLike(value) && isArrayLike(value) &&
|
|
(isStrict || isArray(value) || isArguments(value))) {
|
|
if (isDeep) {
|
|
// Recursively flatten arrays (susceptible to call stack limits).
|
|
baseFlatten(value, isDeep, isStrict, result);
|
|
} else {
|
|
arrayPush(result, value);
|
|
}
|
|
} else if (!isStrict) {
|
|
result[result.length] = value;
|
|
}
|
|
}
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* 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 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;
|
|
}
|
|
|
|
module.exports = baseFlatten;
|