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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 ndarraylike2scalar = require( '@stdlib/ndarray/base/ndarraylike2scalar' );
var numelDimension = require( '@stdlib/ndarray/base/numel-dimension' );
var clipIndex = require( '@stdlib/ndarray/base/clip-index' );
var getStride = require( '@stdlib/ndarray/base/stride' );
var getOffset = require( '@stdlib/ndarray/base/offset' );
var getData = require( '@stdlib/ndarray/base/data-buffer' );
var strided = require( '@stdlib/blas/ext/base/gcopy-within' ).ndarray;
// MAIN //
/**
* Performs an in-place copy of elements within a one-dimensional ndarray.
*
* ## Notes
*
* - The function expects the following ndarrays:
*
* - a one-dimensional input ndarray.
* - a zero-dimensional ndarray specifying a target index.
* - a zero-dimensional ndarray specifying a source start index (inclusive).
* - a zero-dimensional ndarray specifying a source end index (exclusive).
* - a one-dimensional workspace ndarray.
*
* - If the `start` and `target` index ranges do not overlap, the `workspace` ndarray is unused and thus ignored.
*
* @param {ArrayLikeObject<Object>} arrays - array-like object containing ndarrays
* @returns {ndarray} input ndarray
*
* @example
* var vector = require( '@stdlib/ndarray/vector/ctor' );
* var scalar2ndarray = require( '@stdlib/ndarray/from-scalar' );
* var zeros = require( '@stdlib/ndarray/zeros' );
*
* var opts = {
* 'dtype': 'generic'
* };
* var x = vector( [ 1.0, 2.0, 3.0, 4.0, 5.0, 6.0 ], opts.dtype );
* var target = scalar2ndarray( 3, opts );
* var start = scalar2ndarray( 1, opts );
* var end = scalar2ndarray( 4, opts );
*
* var w = zeros( [ 6 ], opts );
*
* var out = gcopyWithin( [ x, target, start, end, w ] );
* // returns <ndarray>[ 1.0, 2.0, 3.0, 2.0, 3.0, 4.0 ]
*/
function gcopyWithin( arrays ) {
var target;
var start;
var end;
var ws;
var wo;
var wd;
var xs;
var xo;
var xd;
var N;
var x;
var w;
x = arrays[ 0 ];
w = arrays[ 4 ];
N = numelDimension( x, 0 );
target = clipIndex( ndarraylike2scalar( arrays[ 1 ] ), N );
start = clipIndex( ndarraylike2scalar( arrays[ 2 ] ), N );
end = clipIndex( ndarraylike2scalar( arrays[ 3 ] ), N );
xd = getData( x );
xs = getStride( x, 0 );
xo = getOffset( x );
wd = getData( w );
ws = getStride( w, 0 );
wo = getOffset( w );
strided( N, target, start, end, xd, xs, xo, wd, ws, wo );
return x;
}
// EXPORTS //
module.exports = gcopyWithin;
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