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* @license Apache-2.0
*
* Copyright (c) 2019 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 isPlainObject = require( '@stdlib/assert/is-plain-object' );
var hasOwnProp = require( '@stdlib/assert/has-own-property' );
var isInteger = require( '@stdlib/assert/is-integer' ).isPrimitive;
var isPositiveInteger = require( '@stdlib/assert/is-positive-integer' ).isPrimitive;
var isNonNegativeInteger = require( '@stdlib/assert/is-nonnegative-integer' ).isPrimitive;
var isNonNegativeNumber = require( '@stdlib/assert/is-nonnegative-number' ).isPrimitive;
var format = require( '@stdlib/string/format' );
// MAIN //
/**
* Validates function options.
*
* @private
* @param {Object} opts - destination object
* @param {Options} options - function options
* @param {PositiveInteger} [options.period] - number of iterations before a waveform repeats
* @param {NonNegativeNumber} [options.amplitude] - peak amplitude
* @param {integer} [options.offset] - phase offset (in units of iterations)
* @param {NonNegativeInteger} [options.iter] - number of iterations
* @returns {(Error|null)} null or an error object
*
* @example
* var opts = {};
* var options = {
* 'iter': 100
* };
* var err = validate( opts, options );
* if ( err ) {
* throw err;
* }
*/
function validate( opts, options ) {
if ( !isPlainObject( options ) ) {
return new TypeError( format( 'invalid argument. Options argument must be an object. Value: `%s`.', options ) );
}
if ( hasOwnProp( options, 'period' ) ) {
opts.period = options.period;
if ( !isPositiveInteger( options.period ) ) {
return new TypeError( format( 'invalid option. `%s` option must be an positive integer. Option: `%s`.', 'period', options.period ) );
}
}
if ( hasOwnProp( options, 'amplitude' ) ) {
opts.amplitude = options.amplitude;
if ( !isNonNegativeNumber( options.amplitude ) ) {
return new TypeError( format( 'invalid option. `%s` option must be a nonnegative number. Option: `%s`.', 'amplitude', options.amplitude ) );
}
}
if ( hasOwnProp( options, 'offset' ) ) {
opts.offset = options.offset;
if ( !isInteger( options.offset ) ) {
return new TypeError( format( 'invalid option. `%s` option must be an integer. Option: `%s`.', 'offset', options.offset ) );
}
}
if ( hasOwnProp( options, 'iter' ) ) {
opts.iter = options.iter;
if ( !isNonNegativeInteger( options.iter ) ) {
return new TypeError( format( 'invalid option. `%s` option must be a nonnegative integer. Option: `%s`.', 'iter', options.iter ) );
}
}
return null;
}
// EXPORTS //
module.exports = validate;
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