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* @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 getOwnPropertySymbols = require( '@stdlib/utils/property-symbols' );
var getPrototypeOf = require( '@stdlib/utils/get-prototype-of' );
var isWritableProperty = require( '@stdlib/assert/is-writable-property' );
var hasOwnProp = require( '@stdlib/assert/has-own-property' );
// MAIN //
/**
* Returns an array of an object's own and inherited writable symbol properties.
*
* @param {*} value - input object
* @returns {Array} a list of own and inherited writable symbol properties
*
* @example
* var symbols = writablePropertySymbolsIn( {} );
*/
function writablePropertySymbolsIn( value ) {
var symbols;
var cache;
var obj;
var tmp;
var k;
var i;
if ( value === null || value === void 0 ) {
return [];
}
// Cast the value to an object:
obj = Object( value );
// Walk the prototype chain collecting all writable symbol properties...
symbols = [];
cache = {};
do {
tmp = getOwnPropertySymbols( obj );
for ( i = 0; i < tmp.length; i++ ) {
k = tmp[ i ];
if (
hasOwnProp( cache, k ) === false &&
isWritableProperty( obj, k )
) {
symbols.push( k );
}
cache[ k ] = true;
}
obj = getPrototypeOf( obj );
} while ( obj );
return symbols;
}
// EXPORTS //
module.exports = writablePropertySymbolsIn;
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