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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 isndarrayLike = require( '@stdlib/assert/is-ndarray-like' );
var isFunction = require( '@stdlib/assert/is-function' );
var unaryReduceSubarrayBy = require( '@stdlib/ndarray/base/unary-reduce-subarray-by' );
var ndims = require( '@stdlib/ndarray/ndims' );
var base = require( '@stdlib/ndarray/base/count-if' );
var objectAssign = require( '@stdlib/object/assign' );
var zeroTo = require( '@stdlib/array/base/zero-to' );
var format = require( '@stdlib/string/format' );
var defaults = require( './defaults.json' );
var validate = require( './validate.js' );
// MAIN //
/**
* Counts the number of elements along one or more ndarray dimensions which pass a test implemented by a predicate function and assigns the results to a provided output ndarray.
*
* @param {ndarray} x - input ndarray
* @param {ndarray} y - output ndarray
* @param {Options} [options] - function options
* @param {IntegerArray} [options.dims] - list of dimensions over which to perform a reduction
* @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} callback argument must be a function
* @throws {Error} must provide valid options
* @returns {ndarray} output ndarray
*
* @example
* var Float64Array = require( '@stdlib/array/float64' );
* var ndarray = require( '@stdlib/ndarray/ctor' );
* var empty = require( '@stdlib/ndarray/empty' );
*
* function predicate( value ) {
* return value > 0.0;
* }
*
* // Create a data buffer:
* var xbuf = new Float64Array( [ 1.0, 2.0, 3.0, 4.0, 5.0, 0.0, 7.0, 8.0, 9.0, 10.0, 11.0, 12.0 ] );
*
* // Define the shape of the input array:
* var shape = [ 3, 1, 2 ];
*
* // Define the array strides:
* var sx = [ 4, 4, 1 ];
*
* // Define the index offset:
* var ox = 1;
*
* // Create an input ndarray:
* var x = new ndarray( 'float64', xbuf, shape, sx, ox, 'row-major' );
*
* // Create an output ndarray:
* var y = empty( [], {
* 'dtype': 'int32'
* });
*
* // Perform reduction:
* var out = assign( x, y, predicate );
* // returns <ndarray>[ 5 ]
*/
function assign( x, y, options, predicate, thisArg ) {
var nargs;
var opts;
var err;
var flg;
var ctx;
var cb;
var o;
var N;
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( y ) ) {
throw new TypeError( format( 'invalid argument. Second argument must be an ndarray-like object. Value: `%s`.', y ) );
}
// Case: assign( x, y, predicate )
if ( nargs < 4 ) {
cb = options;
if ( !isFunction( cb ) ) {
throw new TypeError( format( 'invalid argument. Third argument must be a function. Value: `%s`.', cb ) );
}
}
// Case: assign( x, y, options, predicate, thisArg )
else if ( nargs > 4 ) {
flg = true;
o = options;
cb = predicate;
if ( !isFunction( cb ) ) {
throw new TypeError( format( 'invalid argument. Fourth argument must be a function. Value: `%s`.', cb ) );
}
ctx = thisArg;
}
// Case: assign( x, y, predicate, thisArg )
else if ( isFunction( options ) ) {
cb = options;
ctx = predicate;
}
// Case: assign( x, y, options, predicate )
else if ( isFunction( predicate ) ) {
flg = true;
o = options;
cb = predicate;
}
// Case: assign( x, y, ???, ??? )
else {
throw new TypeError( format( 'invalid argument. Fourth argument must be a function. Value: `%s`.', predicate ) );
}
N = ndims( x );
opts = objectAssign( {}, defaults );
if ( flg ) {
err = validate( opts, N, o );
if ( err ) {
throw err;
}
}
// When a list of dimensions is not provided, reduce the entire input array across all dimensions...
if ( opts.dims === null ) {
opts.dims = zeroTo( N );
}
unaryReduceSubarrayBy( base, [ x, y ], opts.dims, cb, ctx ); // note: we assume that this lower-level function handles further validation of the output ndarray (e.g., expected shape, etc)
return y;
}
// EXPORTS //
module.exports = assign;
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