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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';
// VARIABLES //
var getShape = require( '@stdlib/ndarray/shape' );
// FUNCTIONS //
/**
* Returns complement indices.
*
* ## Notes
*
* - The function mutates the input array.
*
* @private
* @param {NonNegativeIntegerArray} idx - input array containing input indices
* @param {NonNegativeIntegerArray} shape - array shape
* @returns {NonNegativeIntegerArray} input array
*
* @example
* var shape = [ 4, 4, 4 ];
*
* var idx = [ 0, 0, 0 ];
* var out = complementIndices( idx, shape );
* // returns [ 3, 3, 3 ]
*
* idx = [ 3, 3, 3 ];
* var out = complementIndices( idx, shape );
* // returns [ 0, 0, 0 ]
*
* idx = [ 0, 1, 2 ];
* var out = complementIndices( idx, shape );
* // returns [ 3, 2, 1 ]
*/
function complementIndices( idx, shape ) {
var i;
for ( i = 0; i < shape.length; i++ ) {
idx[ i ] = shape[ i ] - idx[ i ] - 1;
}
return idx;
}
// MAIN //
/**
* Wraps a provided callback function.
*
* @private
* @param {ndarrayLike} arr - input ndarray
* @param {Function} clbk - callback function
* @param {thisArg} thisArg - callback execution context
* @returns {Function} callback wrapper
*/
function wrap( arr, clbk, thisArg ) {
var sh = getShape( arr );
return wrapper;
/**
* Invokes a callback function.
*
* @private
* @param {*} v - value
* @param {NonNegativeIntegerArray} idx - current array element indices
* @returns {*} result
*/
function wrapper( v, idx ) {
return clbk.call( thisArg, v, complementIndices( idx, sh ), arr );
}
}
// EXPORTS //
module.exports = wrap;
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