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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 strides2order = require( '@stdlib/ndarray/base/strides2order' );
var zeros = require( '@stdlib/array/base/zeros' );
var defaults = require( '@stdlib/ndarray/defaults' );
// VARIABLES //
var DEFAULT_ORDER = defaults.get( 'order' );
// FUNCTIONS //
/**
* Resolves a storage layout string from a layout integer.
*
* @private
* @param {NonNegativeInteger} layout - layout integer
* @returns {string} layout string
*
* @example
* var order = resolveString( 0 );
* // returns <string>
*
* @example
* var order = resolveString( 1 );
* // returns 'row-major'
*
* @example
* var order = resolveString( 2 );
* // returns 'column-major'
*
* @example
* var order = resolveString( 3 );
* // returns <string>
*/
function resolveString( layout ) {
if ( layout === 1 ) {
return 'row-major';
}
if ( layout === 2 ) {
return 'column-major';
}
// layout === 0 || layout === 3
return DEFAULT_ORDER;
}
// MAIN //
/**
* Resolves the most common underlying storage layout.
*
* @param {ArrayLikeObject<Collection>} strides - list of strides array
* @returns {string} storage layout
*
* @example
* var strides = [ [ 2, 1 ], [ 4, 1 ] ];
*
* var order = consensusOrder( strides );
* // returns 'row-major'
*
* @example
* var strides = [ [ 1, 2 ], [ 1, 4 ] ];
*
* var order = consensusOrder( strides );
* // returns 'column-major'
*
* @example
* var strides = [ [ 2, 1 ], [ 1, 4 ] ];
*
* var order = consensusOrder( strides );
* // returns <string>
*
* @example
* var strides = [ [ 1, 1 ], [ 1, 1 ] ];
*
* var order = consensusOrder( strides );
* // returns <string>
*/
function consensusOrder( strides ) {
var tmp;
var M;
var N;
var i;
N = strides.length;
// Initialize an array for grouping stride arrays according to memory layout:
tmp = zeros( 4 ); // note: `4` corresponds to the number of possible return values from `strides2order`
M = tmp.length;
// Group stride arrays according to memory layout:
for ( i = 0; i < N; i++ ) {
tmp[ strides2order( strides[ i ] ) ] += 1;
}
// Determine which array should be used to determine the consensus order:
if ( tmp[ 0 ] === N ) {
// If all arrays are "disorganized", then fallback to the default order:
return DEFAULT_ORDER;
}
if ( tmp[ 0 ] === N-1 ) {
// If all but one array is "disorganized", find the "organized" array...
for ( i = 1; i < M; i++ ) {
if ( tmp[ i ] > 0 ) {
return resolveString( i );
}
}
}
// We've got at least two "organized" arrays; find the layout which is most common...
if ( tmp[ 1 ] > tmp[ 2 ] ) {
return resolveString( 1 );
}
if ( tmp[ 1 ] < tmp[ 2 ] ) {
return resolveString( 2 );
}
// tmp[ 1 ] === tmp[ 2 ]
return DEFAULT_ORDER;
}
// EXPORTS //
module.exports = consensusOrder;
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