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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 isPlainObject = require( '@stdlib/assert/is-plain-object' );
var isInteger = require( '@stdlib/assert/is-integer' ).isPrimitive;
var isndarrayLike = require( '@stdlib/assert/is-ndarray-like' );
var isCollection = require( '@stdlib/assert/is-collection' );
var hasOwnProp = require( '@stdlib/assert/has-own-property' );
var base = require( '@stdlib/ndarray/base/rot90' );
var format = require( '@stdlib/string/format' );
// MAIN //
/**
* Returns a read-only view of an input ndarray rotated 90 degrees in a specified plane.
*
* @param {ndarray} x - input array
* @param {Options} [options] - function options
* @param {integer} [options.k=1] - number of times to rotate by 90 degrees
* @param {IntegerArray} [options.dims=[-2,-1]] - dimension indices defining the plane of rotation
* @throws {TypeError} first argument must be an ndarray
* @throws {TypeError} options argument must be an object
* @throws {TypeError} `k` option must be an integer
* @throws {TypeError} `dims` option must be an array-like object of integers
* @throws {RangeError} must provide exactly two dimension indices
* @throws {RangeError} input ndarray must have at least two dimensions
* @throws {RangeError} must provide valid dimension indices
* @throws {Error} must provide unique dimension indices
* @returns {ndarray} ndarray view
*
* @example
* var array = require( '@stdlib/ndarray/array' );
*
* var x = array( [ [ 1.0, 2.0 ], [ 3.0, 4.0 ] ] );
* // returns <ndarray>[ [ 1.0, 2.0 ], [ 3.0, 4.0 ] ]
*
* var y = rot90( x );
* // returns <ndarray>[ [ 2.0, 4.0 ], [ 1.0, 3.0 ] ]
*/
function rot90( x, options ) {
var dims;
var k;
if ( !isndarrayLike( x ) ) {
throw new TypeError( format( 'invalid argument. First argument must be an ndarray. Value: `%s`.', x ) );
}
dims = [ -2, -1 ];
k = 1;
if ( arguments.length > 1 ) {
if ( !isPlainObject( options ) ) {
throw new TypeError( format( 'invalid argument. Options argument must be an object. Value: `%s`.', options ) );
}
if ( hasOwnProp( options, 'k' ) ) {
if ( !isInteger( options.k ) ) {
throw new TypeError( format( 'invalid option. `%s` option must be an integer. Option: `%s`.', 'k', options.k ) );
}
k = options.k;
}
if ( hasOwnProp( options, 'dims' ) ) {
if ( !isCollection( options.dims ) ) {
throw new TypeError( format( 'invalid option. `%s` option must be an array-like object. Option: `%s`.', 'dims', options.dims ) );
}
dims = options.dims;
}
}
return base( x, dims, k, false );
}
// EXPORTS //
module.exports = rot90;
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