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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 isObject = require( '@stdlib/assert/is-plain-object' );
var hasOwnProp = require( '@stdlib/assert/has-own-property' );
var indexOf = require( '@stdlib/utils/index-of' );
var format = require( '@stdlib/string/format' );
// VARIABLES //
var returns = [ 'values', 'keys', '*' ];
// MAIN //
/**
* Validates function options.
*
* @private
* @param {Object} opts - destination object
* @param {Options} options - function options
* @param {*} [options.thisArg] - execution context
* @param {string} [options.returns] - output format
* @returns {(Error|null)} null or an error object
*
* @example
* var opts = {};
* var options = {
* 'returns': '*',
* 'thisArg': {}
* };
* var err = validate( opts, options );
* if ( err ) {
* throw err;
* }
*/
function validate( opts, options ) {
if ( !isObject( options ) ) {
return new TypeError( format( 'invalid argument. Options argument must be an object. Value: `%s`.', options ) );
}
if ( hasOwnProp( options, 'thisArg' ) ) {
opts.thisArg = options.thisArg;
}
if ( hasOwnProp( options, 'returns' ) ) {
opts.returns = options.returns;
if ( indexOf( returns, opts.returns ) === -1 ) {
return new TypeError( format( 'invalid option. `%s` option must be one of the following: "%s". Option: `%s`.', 'returns', returns.join( '", "' ), opts.returns ) );
}
}
return null;
}
// EXPORTS //
module.exports = validate;
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