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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 isFunction = require( '@stdlib/assert/is-function' );
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 - options to validate
* @param {number} [options.level] - merge level
* @param {boolean} [options.copy] - boolean indicating whether to deep copy merged values
* @param {(boolean|Function)} [options.override] - defines the merge strategy
* @param {boolean} [options.extend] - boolean indicating whether new properties can be added to the target object
* @returns {(Error|null)} error object or null
*/
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, 'level' ) ) {
opts.level = options.level;
if ( !isPositiveInteger( opts.level ) ) {
return new TypeError( format( 'invalid option. `%s` option must be a positive integer. Option: `%s`.', 'level', opts.level ) );
}
}
if ( hasOwnProp( options, 'copy' ) ) {
opts.copy = options.copy;
if ( !isBoolean( opts.copy ) ) {
return new TypeError( format( 'invalid option. `%s` option must be a boolean. Option: `%s`.', 'copy', opts.copy ) );
}
}
if ( hasOwnProp( options, 'override' ) ) {
opts.override = options.override;
if (
!isBoolean( opts.override ) &&
!isFunction( opts.override )
) {
return new TypeError( format( 'invalid option. `%s` option must be either a boolean or a function. Option: `%s`.', 'override', opts.override ) );
}
}
if ( hasOwnProp( options, 'extend' ) ) {
opts.extend = options.extend;
if ( !isBoolean( opts.extend ) ) {
return new TypeError( format( 'invalid option. `%s` option must be a boolean. Option: `%s`.', 'extend', opts.extend ) );
}
}
return null;
}
// EXPORTS //
module.exports = validate;
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