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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 isInteger = require( '@stdlib/assert/is-integer' ).isPrimitive;
var getShape = require( '@stdlib/ndarray/shape' );
var normalizeIndex = require( '@stdlib/ndarray/base/normalize-index' );
var assign = require( '@stdlib/ndarray/base/assign' );
var resolveGetter = require( '@stdlib/array/base/resolve-getter' );
var join = require( '@stdlib/array/base/join' );
var format = require( '@stdlib/string/format' );
// MAIN //
/**
* Copies elements from an input ndarray to an output ndarray and replaces the element at a specified index with a provided value.
*
* @private
* @param {ndarray} x - input ndarray
* @param {IntegerArray} indices - indices of the element to replace
* @param {*} value - value to set
* @param {ndarray} out - output ndarray
* @throws {TypeError} second argument must be an array of integers
* @throws {RangeError} second argument must be an array of valid indices
* @returns {ndarray} output ndarray
*
* @example
* var ndarray = require( '@stdlib/ndarray/ctor' );
* var emptyLike = require( '@stdlib/ndarray/empty-like' );
*
* var buffer = [ 1, 2, 3, 4 ];
* var shape = [ 2, 2 ];
* var order = 'row-major';
* var strides = [ 2, 1 ];
* var offset = 0;
*
* var x = ndarray( 'generic', buffer, shape, strides, offset, order );
*
* var out = base( x, [ 0, 0 ], 5, emptyLike( x ) );
* // returns <ndarray>[ [ 5, 2 ], [ 3, 4 ] ]
*/
function base( x, indices, value, out ) {
var args;
var idx;
var get;
var sh;
var i;
sh = getShape( x );
// Resolve an element accessor for retrieving indices:
get = resolveGetter( indices );
// Normalize the provided indices...
args = [];
for ( i = 0; i < sh.length; i++ ) {
idx = get( indices, i );
if ( !isInteger( idx ) ) {
throw new TypeError( format( 'invalid argument. Second argument must be an array of integers. Value: `%s`.', indices ) );
}
idx = normalizeIndex( idx, sh[ i ]-1 );
if ( idx === -1 ) {
throw new RangeError( format( 'invalid argument. Second argument contains an out-of-bounds index. Array shape: (%s). Value: `[%s]`.', join( sh, ',' ), join( indices, ',' ) ) );
}
args.push( idx );
}
args.push( value );
// Copy the input array:
assign( [ x, out ] );
// Set the element at the specified indices:
out.set.apply( out, args );
return out;
}
// EXPORTS //
module.exports = base;
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