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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 isNonNegativeInteger = require( '@stdlib/assert/is-nonnegative-integer' );
var isUnityProbabilityArray = require( '@stdlib/assert/is-unity-probability-array' );
var hasOwnProp = require( '@stdlib/assert/has-own-property' );
var isBoolean = require( '@stdlib/assert/is-boolean' ).isPrimitive;
var isObject = require( '@stdlib/assert/is-plain-object' );
var format = require( '@stdlib/string/format' );
// MAIN //
/**
* Validates function options.
*
* @private
* @param {Object} opts - destination for validated options
* @param {Options} options - function options
* @param {NonNegativeInteger} [options.size] - sample size
* @param {ProbabilityArray} [options.probs] - element probabilities
* @param {boolean} [options.replace] - boolean indicating whether to sample with replacement
* @param {boolean} [options.mutate] - boolean indicating whether to mutate the `pool` when sampling without replacement
* @returns {(null|Error)} null or an error
*
* @example
* var opts = {};
* var options = {
* 'size': 10,
* 'replace': false,
* 'mutate': true,
* 'probs': [ 0.7, 0.3 ]
* };
* 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, 'size' ) ) {
opts.size = options.size;
if ( !isNonNegativeInteger( opts.size ) ) {
return new TypeError( format( 'invalid option. `%s` option must be a nonnegative integer. Option: `%s`.', 'size', opts.size ) );
}
}
if ( hasOwnProp( options, 'probs' ) ) {
opts.probs = options.probs;
if ( !isUnityProbabilityArray( opts.probs ) ) {
return new TypeError( format( 'invalid option. `%s` option must be an array of probabilities that sum to one. Option: `%s`.', 'probs', opts.probs ) );
}
}
if ( hasOwnProp( options, 'mutate' ) ) {
opts.mutate = options.mutate;
if ( !isBoolean( opts.mutate ) ) {
return new TypeError( format( 'invalid option. `%s` option must be a boolean. Option: `%s`.', 'mutate', opts.mutate ) );
}
}
if ( hasOwnProp( options, 'replace' ) ) {
opts.replace = options.replace;
if ( !isBoolean( opts.replace ) ) {
return new TypeError( format( 'invalid option. `%s` option must be a boolean. Option: `%s`.', 'replace', opts.replace ) );
}
}
return null;
}
// EXPORTS //
module.exports = validate;
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