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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 MAX_SAFE_INTEGER = require( '@stdlib/constants/float64/max-safe-integer' );
var isPositiveInteger = require( '@stdlib/assert/is-positive-integer' ).isPrimitive;
var isNonEnumerableProperty = require( '@stdlib/assert/is-nonenumerable-property' );
var getOwnPropertySymbols = require( '@stdlib/utils/property-symbols' );
var getPrototypeOf = require( '@stdlib/utils/get-prototype-of' );
var hasOwnProp = require( '@stdlib/assert/has-own-property' );
var format = require( '@stdlib/string/format' );
// MAIN //
/**
* Returns an array of an object's inherited non-enumerable symbol properties.
*
* @param {*} value - input object
* @param {PositiveInteger} [level] - inheritance level
* @throws {TypeError} second argument must be a positive integer
* @returns {Array} a list of inherited non-enumerable symbol properties
*
* @example
* var symbols = inheritedNonEnumerablePropertySymbols( [] );
*/
function inheritedNonEnumerablePropertySymbols( value, level ) { // eslint-disable-line id-length
var cache;
var out;
var obj;
var tmp;
var N;
var n;
var k;
var i;
if ( arguments.length > 1 ) {
if ( !isPositiveInteger( level ) ) {
throw new TypeError( format( 'invalid argument. Second argument must be a positive integer. Value: `%s`.', level ) );
}
N = level;
} else {
N = MAX_SAFE_INTEGER;
}
if ( value === null || value === void 0 ) {
return [];
}
// Get the value's prototype:
obj = getPrototypeOf( value );
// Walk the prototype chain collecting non-enumerable symbol properties...
cache = {};
out = [];
n = 1;
while ( obj && n <= N ) {
tmp = getOwnPropertySymbols( obj );
for ( i = 0; i < tmp.length; i++ ) {
k = tmp[ i ];
if (
hasOwnProp( cache, k ) === false &&
isNonEnumerableProperty( obj, k )
) {
out.push( k );
}
cache[ k ] = true;
}
obj = getPrototypeOf( obj );
n += 1;
}
return out;
}
// EXPORTS //
module.exports = inheritedNonEnumerablePropertySymbols;
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