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* @license Apache-2.0
*
* Copyright (c) 2018 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 isRowMajor = require( '@stdlib/ndarray/base/assert/is-row-major-string' );
var abs = require( '@stdlib/math/base/special/abs' );
// MAIN //
/**
* Expands a strides array to accommodate an expanded array shape (i.e., an array shape with prepended singleton dimensions).
*
* @private
* @param {NonNegativeInteger} ndims - number of dimensions
* @param {Array} shape - expanded array shape
* @param {Array} strides - strides array
* @param {string} order - memory layout order
* @returns {Array} output strides array
*
* @example
* var out = expandStrides( 4, [ 1, 1, 2, 2 ], [ 1, 2 ], 'column-major' );
* // returns [ 1, 1, 1, 2 ]
*
* @example
* var out = expandStrides( 4, [ 1, 1, 2, 2 ], [ 2, 1 ], 'row-major' );
* // returns [ 4, 4, 2, 1 ]
*/
function expandStrides( ndims, shape, strides, order ) {
var out;
var N;
var s;
var i;
var j;
N = strides.length;
j = ndims - N;
out = [];
if ( isRowMajor( order ) ) {
s = abs( strides[ 0 ] ) * shape[ j ]; // at `j` is the size of the first non-prepended dimension
for ( i = 0; i < j; i++ ) {
out.push( s );
}
for ( i = 0; i < N; i++ ) {
out.push( strides[ i ] );
}
} else { // column-major
for ( i = 0; i < j; i++ ) {
out.push( 1 );
}
for ( i = 0; i < N; i++ ) {
out.push( strides[ i ] );
}
}
return out;
}
// EXPORTS //
module.exports = expandStrides;
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