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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 isObject = require( '@stdlib/assert/is-plain-object' );
var isFunction = require( '@stdlib/assert/is-function' );
var isndarrayLike = require( '@stdlib/assert/is-ndarray-like' );
var reverse = require( '@stdlib/ndarray/base/reverse' );
var base = require( '@stdlib/ndarray/find' ).assign;
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 {boolean} [options.keepdims=false] - boolean indicating whether the reduced dimensions should be included in the returned ndarray as singleton dimensions
* @param {(*|ndarray)} [options.sentinelValue] - 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' );
*
* // 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': x.dtype
* });
*
* // Perform reduction:
* var out = assign( x, y, isEven );
* // returns <ndarray>
*
* var v = out.get();
* // returns 8.0
*/
function assign( x, out, options, predicate, thisArg ) {
var nargs;
var flg;
var ctx;
var cb;
var o;
var f;
var y;
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`.', x ) );
}
// Case: assign( x, out, predicate )
if ( nargs < 4 ) {
if ( !isFunction( options ) ) {
throw new TypeError( format( 'invalid argument. Callback argument must be a function. Value: `%s`.', options ) );
}
cb = options;
}
// 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 ) );
}
// Wrap the callback function...
f = wrap( x, cb, ctx );
// Create a reversed view of the input ndarray...
y = reverse( x, false );
if ( flg ) {
if ( !isObject( o ) ) {
throw new TypeError( format( 'invalid argument. Options argument must be an object. Value: `%s`.', o ) );
}
return base( y, out, o, f );
}
return base( y, out, f );
}
// EXPORTS //
module.exports = assign;
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