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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 flattenShape = require( '@stdlib/ndarray/base/flatten-shape' );
var format = require( '@stdlib/string/format' );
// MAIN //
/**
* Unflattens a shape over multiple dimensions.
*
* @param {NonNegativeIntegerArray} shape - array shape
* @param {NonNegativeInteger} dim - dimension to be unflattened
* @param {NonNegativeIntegerArray} sizes - new shape of the unflattened dimension
* @param {NonNegativeIntegerArray} out - output array
* @throws {RangeError} - product of the sizes array must be equal to 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 s;
var i;
var j;
var k;
s = flattenShape( sizes, sizes.length-1 );
if ( shape[ dim ] !== s[ 0 ] ) {
throw new RangeError( format( 'invalid argument. Product of the sizes array must be equal to the dimension to be unflattened. Dim: `%d`. Product: `%d`.', shape[dim], s[0] ) );
}
for ( i = 0; i < dim; i++ ) {
out[ i ] = shape[ i ];
}
j = 0;
k = dim + sizes.length - 1;
for ( i = dim; i <= k; i++ ) {
out[ i ] = sizes[ j ];
j += 1;
}
j = shape.length - 1;
for ( i = out.length-1; i > k; i-- ) {
out[ i ] = shape[ j ];
j -= 1;
}
return out;
}
// EXPORTS //
module.exports = unflattenShape;
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