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* @license Apache-2.0
*
* Copyright (c) 2026 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 isIntegerArray = require( '@stdlib/assert/is-integer-array' ).primitives;
var isEmptyCollection = require( '@stdlib/assert/is-empty-collection' );
var normalizeIndices = require( '@stdlib/ndarray/base/to-unique-normalized-indices' );
var join = require( '@stdlib/array/base/join' );
var format = require( '@stdlib/string/format' );
// MAIN //
/**
* Validates function options.
*
* @private
* @param {Object} opts - destination object
* @param {NonNegativeInteger} ndims - number of input ndarray dimensions
* @param {Options} options - function options
* @param {IntegerArray} [options.dims] - list of dimensions over which to perform the operation
* @returns {(Error|null)} null or an error object
*
* @example
* var opts = {};
* var options = {
* 'dims': [ 0 ]
* };
* var err = validate( opts, 2, options );
* if ( err ) {
* throw err;
* }
*/
function validate( opts, ndims, options ) {
var tmp;
if ( !isObject( options ) ) {
return new TypeError( format( 'invalid argument. Options argument must be an object. Value: `%s`.', options ) );
}
if ( hasOwnProp( options, 'dims' ) ) {
opts.dims = options.dims;
if ( !isIntegerArray( opts.dims ) && !isEmptyCollection( opts.dims ) ) {
return new TypeError( format( 'invalid option. `%s` option must be an array of integers. Option: `%s`.', 'dims', opts.dims ) );
}
tmp = normalizeIndices( opts.dims, ndims-1 );
if ( tmp === null ) {
return new RangeError( format( 'invalid option. `%s` option contains an out-of-bounds dimension index. Option: [%s].', 'dims', join( opts.dims, ',' ) ) );
}
if ( tmp.length !== opts.dims.length ) {
return new Error( format( 'invalid option. `%s` option contains duplicate indices. Option: [%s].', 'dims', join( opts.dims, ',' ) ) );
}
opts.dims = tmp;
}
return null;
}
// EXPORTS //
module.exports = validate;
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