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* @license Apache-2.0
*
* Copyright (c) 2025 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 promoteDataTypes = require( '@stdlib/ndarray/base/promote-dtypes' );
var mostlySafeCasts = require( '@stdlib/ndarray/mostly-safe-casts' );
var defaults = require( '@stdlib/ndarray/defaults' );
var empty = require( '@stdlib/ndarray/empty' );
var slice = require( '@stdlib/array/slice' );
var getShape = require( '@stdlib/ndarray/shape' );
var getDtype = require( '@stdlib/ndarray/dtype' );
var format = require( '@stdlib/string/format' );
// FUNCTIONS //
/**
* Returns output ndarray order.
*
* @private
* @param {ArrayLikeObject<IntegerArray>} orders - list of input ndarray orders
* @returns {integer} output ndarray order
*/
function resolveOutputOrder( orders ) {
var o;
var i;
o = orders[ 0 ];
for ( i = 0; i < orders.length; i++ ) {
if ( orders[ i ] !== o ) {
return defaults.order;
}
}
return o;
}
// MAIN //
/**
* Returns an output ndarray.
*
* @param {ArrayLikeObject<IntegerArray>} shapes - input ndarray shapes
* @param {ArrayLikeObject<StringArray>} dtypes - input ndarray dtypes
* @param {ArrayLikeObject<StringArray>} orders - input ndarray orders
* @param {integer} dim - irregular dimension
* @param {ndarray} [out] - output ndarray
* @throws {TypeError} output ndarray must have a valid data type
* @throws {TypeError} output ndarray must have a valid order
* @throws {RangeError} output ndarray must have valid number of dimensions
* @throws {RangeError} output ndarray must have a valid shape
* @returns {ndarray} output ndarray
*
* @example
*/
function output( shapes, dtypes, orders, dim, out ) {
var allowedCasts;
var ord;
var osh;
var odt;
var sh;
var dt;
var s;
var i;
// Resolve the output shape:
sh = slice( shapes[ 0 ] );
for ( i = 1; i < shapes.length; i++ ) {
s = shapes[ i ];
sh[ dim ] += s[ dim ];
}
if ( out ) {
// When output is provided: validate that inputs can cast to output dtype
odt = getDtype( out );
for ( i = 0; i < dtypes.length; i++ ) {
allowedCasts = mostlySafeCasts( dtypes[ i ] );
if ( allowedCasts.indexOf( odt ) === -1 ) {
throw new TypeError( format( 'invalid argument. Input ndarray at index %d has dtype `%s` which cannot be safely cast to output dtype `%s`.', i, dtypes[ i ], odt ) );
}
}
// Validate output shape:
osh = getShape( out );
if ( osh.length !== sh.length ) {
throw new RangeError( format( 'invalid argument. Output ndarray must have %d dimensions. Value: %d.', sh.length, getShape( out ).length ) );
}
for ( i = 0; i < sh.length; i++ ) {
if ( osh[ i ] !== sh[ i ] ) {
throw new RangeError( format( 'invalid argument. Output ndarray dimension %d must have size %d. Value: %d.', i, sh[ i ], getShape( out )[ i ] ) );
}
}
return null;
}
dt = promoteDataTypes( dtypes );
ord = resolveOutputOrder( orders );
out = empty( sh, {
'dtype': dt,
'order': ord
});
return out;
}
// EXPORTS //
module.exports = output;
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