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* @license Apache-2.0
*
* Copyright (c) 2023 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 isString = require( '@stdlib/assert/is-string' ).isPrimitive;
var shape2strides = require( '@stdlib/ndarray/base/shape2strides' );
var defaults = require( '@stdlib/ndarray/defaults' );
var copyIndexed = require( '@stdlib/array/base/copy-indexed' );
// VARIABLES //
var DEFAULT_ORDER = defaults.get( 'order' );
// MAIN //
/**
* Returns the strides of a provided ndarray.
*
* @param {ndarrayLike} x - input ndarray
* @param {boolean} copy - boolean indicating whether to explicitly copy the value assigned to the input ndarray's `strides` property
* @returns {IntegerArray} strides
*
* @example
* var zeros = require( '@stdlib/ndarray/zeros' );
*
* var out = strides( zeros( [ 3, 3, 3 ] ), false );
* // returns [ 9, 3, 1 ]
*/
function strides( x, copy ) {
var ord;
var sh;
var st;
st = x.strides;
if ( typeof st !== 'object' || st === null ) {
sh = x.shape;
if ( sh.length === 0 ) {
return [ 0 ];
}
ord = x.order;
if ( !isString( ord ) ) {
ord = DEFAULT_ORDER;
}
return shape2strides( sh, ord );
}
if ( copy ) {
return copyIndexed( st );
}
return st;
}
// EXPORTS //
module.exports = strides;
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