73 lines
1.8 KiB
JavaScript
73 lines
1.8 KiB
JavaScript
/**
|
|
* @license Apache-2.0
|
|
*
|
|
* Copyright (c) 2018 The Stdlib Authors.
|
|
*
|
|
* Licensed under the Apache License, Version 2.0 (the "License");
|
|
* you may not use this file except in compliance with the License.
|
|
* You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
* See the License for the specific language governing permissions and
|
|
* limitations under the License.
|
|
*/
|
|
|
|
'use strict';
|
|
|
|
// MODULES //
|
|
|
|
var objectKeys = require( './../../keys' );
|
|
var isPlainObject = require( '@stdlib/assert/is-plain-object' );
|
|
var isArray = require( '@stdlib/assert/is-array' );
|
|
|
|
|
|
// MAIN //
|
|
|
|
/**
|
|
* Recursively flattens an object.
|
|
*
|
|
* @private
|
|
* @param {Object} out - output object
|
|
* @param {ObjectLike} obj - input object
|
|
* @param {string} prefix - key prefix
|
|
* @param {NonNegativeInteger} depth - recursion depth
|
|
* @param {Options} opts - options
|
|
* @param {boolean} opts.flattenArrays - boolean indicating whether to flatten arrays
|
|
* @param {string} opts.delimiter - key path delimiter
|
|
* @returns {Object} output object
|
|
*/
|
|
function recurse( out, obj, prefix, depth, opts ) {
|
|
var keys;
|
|
var val;
|
|
var key;
|
|
var i;
|
|
if ( prefix ) {
|
|
prefix += opts.delimiter;
|
|
}
|
|
keys = objectKeys( obj );
|
|
for ( i = 0; i < keys.length; i++ ) {
|
|
val = obj[ keys[i] ];
|
|
key = prefix + keys[ i ];
|
|
if ( depth ) {
|
|
if (
|
|
(isPlainObject( val ) && objectKeys( val ).length) ||
|
|
(opts.flattenArrays && isArray( val ))
|
|
) {
|
|
recurse( out, val, key, depth-1, opts );
|
|
continue;
|
|
}
|
|
}
|
|
out[ key ] = val;
|
|
}
|
|
return out;
|
|
}
|
|
|
|
|
|
// EXPORTS //
|
|
|
|
module.exports = recurse;
|