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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.
*/
/* eslint-disable max-len, max-params */
'use strict';
// MODULES //
var gcopy = require( '@stdlib/blas/base/gcopy' ).ndarray;
// MAIN //
/**
* Permutes the rows of a matrix according to the specified strided permutation array.
*
* @private
* @param {NonNegativeInteger} M - number of rows in matrix `A`
* @param {NonNegativeInteger} N - number of columns in matrix `A`
* @param {Object} A - input matrix object
* @param {Collection} A.data - input matrix data
* @param {Array<Function>} A.accessors - matrix element accessors
* @param {integer} strideA1 - stride length for the first dimension of `A`
* @param {integer} strideA2 - stride length for the second dimension of `A`
* @param {NonNegativeInteger} offsetA - starting index for `A`
* @param {Object} ip - permutation index array object
* @param {Collection} ip.data - permutation index array data
* @param {Array<Function>} ip.accessors - permutation index array element accessors
* @param {integer} strideIp - stride length for `ip`
* @param {NonNegativeInteger} offsetIp - starting index for `ip`
* @param {Object} workspace - workspace array object
* @param {Collection} workspace.data - workspace array data
* @param {Array<Function>} workspace.accessors - workspace array element accessors
* @param {integer} strideW - stride length for `workspace`
* @param {NonNegativeInteger} offsetW - starting index for `workspace`
* @returns {Object} `A`
*
* @example
* var toAccessorArray = require( '@stdlib/array/base/to-accessor-array' );
* var arraylike2object = require( '@stdlib/array/base/arraylike2object' );
*
* var A = [ 1.0, 2.0, 3.0, 4.0, 5.0, 6.0 ];
* var ip = [ 2, 0, 1 ];
* var workspace = [ 0.0, 0.0 ];
*
* gpermuteRows( 3, 2, arraylike2object( toAccessorArray( A ) ), 2, 1, 0, arraylike2object( toAccessorArray( ip ) ), 1, 0, arraylike2object( toAccessorArray( workspace ) ), 1, 0 );
* // A => [ 5.0, 6.0, 1.0, 2.0, 3.0, 4.0 ]
*/
function gpermuteRows( M, N, A, strideA1, strideA2, offsetA, ip, strideIp, offsetIp, workspace, strideW, offsetW ) {
var abuf;
var pbuf;
var wbuf;
var pget;
var pset;
var pp;
var i;
var j;
var k;
// Cache references to array data:
abuf = A.data;
pbuf = ip.data;
wbuf = workspace.data;
// Cache references to the element accessors:
pget = ip.accessors[ 0 ];
pset = ip.accessors[ 1 ];
pp = offsetIp;
for ( i = 0; i < M; i++ ) {
if ( pget( pbuf, pp ) === i ) {
pp += strideIp;
continue;
}
// Save row `i` into the workspace...
gcopy( N, abuf, strideA2, offsetA+(i*strideA1), wbuf, strideW, offsetW );
// Follow the permutation cycle...
j = i;
k = pget( pbuf, offsetIp+(j*strideIp) );
while ( k !== i ) {
// Copy row `k` into row `j`...
gcopy( N, abuf, strideA2, offsetA+(k*strideA1), abuf, strideA2, offsetA+(j*strideA1) );
pset( pbuf, offsetIp+(j*strideIp), j );
j = k;
k = pget( pbuf, offsetIp+(j*strideIp) );
}
// Close the cycle by copying the workspace into row `j`...
gcopy( N, wbuf, strideW, offsetW, abuf, strideA2, offsetA+(j*strideA1) );
pset( pbuf, offsetIp+(j*strideIp), j );
pp += strideIp;
}
return A;
}
// EXPORTS //
module.exports = gpermuteRows;
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