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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 isBoolean = require( '@stdlib/assert/is-boolean' ).isPrimitive;
var isPositiveInteger = require( '@stdlib/assert/is-positive-integer' ).isPrimitive;
var format = require( '@stdlib/string/format' );
// MAIN //
/**
* Validates function options.
*
* @private
* @param {Object} opts - destination object
* @param {Options} options - function options
* @param {*} [options.thisArg] - execution context
* @param {PositiveInteger} [options.limit] - maximum number of pending invocations at any one time
* @param {boolean} [options.series] - boolean indicating whether to wait for a previous invocation to complete before invoking a provided function for the next element in a collection
* @returns {(Error|null)} null or an error object
*
* @example
* var opts = {};
* var options = {
* 'thisArg': {},
* 'series': false,
* 'limit': 10
* };
* 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, 'series' ) ) {
opts.series = options.series;
if ( !isBoolean( opts.series ) ) {
return new TypeError( format( 'invalid option. `%s` option must be a boolean. Option: `%s`.', 'series', opts.series ) );
}
}
if ( hasOwnProp( options, 'limit' ) ) {
opts.limit = options.limit;
if ( !isPositiveInteger( opts.limit ) ) {
return new TypeError( format( 'invalid option. `%s` option must be a positive integer. Option: `%s`.', 'limit', opts.limit ) );
}
}
return null;
}
// EXPORTS //
module.exports = validate;
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