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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 isFunction = require( '@stdlib/assert/is-function' );
var isndarrayLike = require( '@stdlib/assert/is-ndarray-like' );
var reverse = require( '@stdlib/ndarray/base/reverse' );
var find = require( '@stdlib/ndarray/find' ).assign; // eslint-disable-line stdlib/no-redeclare
var format = require( '@stdlib/string/format' );
var wrap = require( './callback_wrapper.js' );
// MAIN //
/**
* Finds the last elements which pass a test implemented by a predicate function along one or more ndarray dimensions and assigns results to a provided output ndarray.
*
* @param {ndarray} x - input ndarray
* @param {ndarray} out - output ndarray
* @param {Options} [options] - function options
* @param {IntegerArray} [options.dims] - list of dimensions over which to perform a reduction
* @param {(*|ndarray)} [options.sentinel] - sentinel value
* @param {Function} predicate - predicate function
* @param {*} [thisArg] - predicate function execution context
* @throws {TypeError} first argument must be an ndarray-like object
* @throws {TypeError} second argument must be an ndarray-like object
* @throws {TypeError} options argument must be an object
* @throws {TypeError} predicate argument must be a function
* @throws {RangeError} dimension indices must not exceed input ndarray bounds
* @throws {RangeError} number of dimension indices must not exceed the number of input ndarray dimensions
* @throws {Error} must provide valid options
* @returns {ndarray} output ndarray
*
* @example
* var isEven = require( '@stdlib/assert/is-even' ).isPrimitive;
* var array = require( '@stdlib/ndarray/array' );
* var empty = require( '@stdlib/ndarray/empty' );
* var getDType = require( '@stdlib/ndarray/dtype' );
*
* // Create an input ndarray:
* var x = array( [ [ [ 1.0, 2.0 ], [ 3.0, 4.0 ] ], [ [ 5.0, 6.0 ], [ 7.0, 8.0 ] ] ] );
* // returns <ndarray>
*
* // Create an output ndarray:
* var y = empty( [], {
* 'dtype': getDType( x )
* });
*
* // Perform reduction:
* var out = assign( x, y, isEven );
* // returns <ndarray>[ 8.0 ]
*/
function assign( x, out, options, predicate, thisArg ) {
var viewOut;
var viewX;
var nargs;
var flg;
var ctx;
var cb;
var o;
var f;
nargs = arguments.length;
if ( !isndarrayLike( x ) ) {
throw new TypeError( format( 'invalid argument. First argument must be an ndarray-like object. Value: `%s`.', x ) );
}
if ( !isndarrayLike( out ) ) {
throw new TypeError( format( 'invalid argument. Second argument must be an ndarray-like object. Value: `%s`.', out ) );
}
// Case: assign( x, out, predicate )
if ( nargs < 4 ) {
cb = options;
if ( !isFunction( cb ) ) {
throw new TypeError( format( 'invalid argument. Callback argument must be a function. Value: `%s`.', cb ) );
}
}
// Case: assign( x, out, options, predicate, thisArg )
else if ( nargs > 4 ) {
flg = true;
o = options;
cb = predicate;
if ( !isFunction( cb ) ) {
throw new TypeError( format( 'invalid argument. Callback argument must be a function. Value: `%s`.', cb ) );
}
ctx = thisArg;
}
// Case: assign( x, out, predicate, thisArg )
else if ( isFunction( options ) ) {
cb = options;
ctx = predicate;
}
// Case: assign( x, out, options, predicate )
else if ( isFunction( predicate ) ) {
flg = true;
o = options;
cb = predicate;
}
// Case: find( x, out, ???, ??? )
else {
throw new TypeError( format( 'invalid argument. Callback argument must be a function. Value: `%s`.', predicate ) );
}
// Create reversed views of the input and output ndarrays so that we iterate from last-to-first, rather than first-to-last:
viewX = reverse( x, false );
viewOut = reverse( out, true );
// Wrap the callback function to ensure that the input ndarray is passed as an argument to a provided callback and not the view:
f = wrap( x, cb, ctx );
// Delegate to `find` to perform actual search...
if ( flg ) {
find( viewX, viewOut, o, f );
} else {
find( viewX, viewOut, f );
}
return out;
}
// EXPORTS //
module.exports = assign;
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