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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 numel = require( '@stdlib/ndarray/base/numel' );
var normalizeIndex = require( '@stdlib/ndarray/base/normalize-index' );
var join = require( '@stdlib/array/base/join' );
var format = require( '@stdlib/string/format' );
// MAIN //
/**
* Expands a dimension over multiple dimensions.
*
* @param {NonNegativeIntegerArray} shape - array shape
* @param {integer} dim - dimension to be unflattened
* @param {NonNegativeIntegerArray} sizes - new shape of the unflattened dimension
* @param {NonNegativeIntegerArray} out - output array
* @throws {RangeError} second argument is out-of-bounds
* @throws {RangeError} product of the sizes must be equal to the size of the dimension to be unflattened
* @returns {NonNegativeIntegerArray} unflattened shape
*
* @example
* var o = [ 0, 0, 0, 0 ];
*
* var out = unflattenShape( [ 6, 2, 1 ], 0, [ 3, 2 ], o );
* // returns [ 3, 2, 2, 1 ]
*
* var bool = ( out === o );
* // returns true
*/
function unflattenShape( shape, dim, sizes, out ) {
var S1;
var S2;
var N;
var d;
var i;
var j;
S1 = shape.length;
d = normalizeIndex( dim, S1-1 );
if ( d < 0 ) {
throw new RangeError( format( 'invalid argument. Dimension index exceeds the number of dimensions. Number of dimensions: %d. Value: `%d`.', S1, dim ) );
}
S2 = sizes.length;
N = numel( sizes );
if ( N !== shape[ d ] ) {
throw new RangeError( format( 'invalid argument. Product of the sizes must be equal to the size of the dimension to be unflattened. Dimension: %d. Size: %d. Value: `[%s]`.', d, shape[ d ], join( sizes, ', ' ) ) );
}
for ( i = 0; i < d; i++ ) {
out[ i ] = shape[ i ];
}
j = 0;
for ( ; i < d+S2; i++ ) {
out[ i ] = sizes[ j ];
j += 1;
}
j = d + 1;
if ( j < S1 ) {
for ( ; i < S1+S2-1; i++ ) {
out[ i ] = shape[ j ];
j += 1;
}
}
return out;
}
// EXPORTS //
module.exports = unflattenShape;
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