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* @license Apache-2.0
*
* Copyright (c) 2024 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 arraylike2object = require( '@stdlib/array/base/arraylike2object' );
// FUNCTIONS //
/**
* Applies a mask and a callback function to an indexed array and assigns results to elements in an indexed output array.
*
* @private
* @param {Collection} x - input array
* @param {IntegerArray} mask - mask array
* @param {Collection} out - output array
* @param {integer} stride - output array stride
* @param {NonNegativeInteger} offset - output array offset
* @param {Function} clbk - function to apply
* @param {*} [thisArg] - callback execution context
* @returns {Collection} output array
*
* @example
* var x = [ 1, 2, 3, 4 ];
* var mask = [ 0, 1, 0, 1 ];
*
* var out = [ 0, 0, 0, 0 ];
*
* function scale( x ) {
* return x * 10;
* }
*
* var arr = indexed( x, mask, out, 1, 0, scale );
* // returns [ 20, 40, 0, 0 ]
*/
function indexed( x, mask, out, stride, offset, clbk, thisArg ) {
var io;
var i;
io = offset;
for ( i = 0; i < x.length; i++ ) {
if ( mask[ i ] ) {
out[ io ] = clbk.call( thisArg, x[ i ], i, x );
io += stride;
}
}
return out;
}
/**
* Applies a mask and a callback function to an input accessor array and assigns results to elements in an output accessor array.
*
* @private
* @param {Object} x - input array object
* @param {Object} mask - mask array object
* @param {Object} out - output array object
* @param {integer} stride - output array stride
* @param {NonNegativeInteger} offset - output array offset
* @param {Function} clbk - function to apply
* @param {*} [thisArg] - callback execution context
* @returns {Collection} output array
*
* @example
* var toAccessorArray = require( '@stdlib/array/base/to-accessor-array' );
* var arraylike2object = require( '@stdlib/array/base/arraylike2object' );
*
* var x = toAccessorArray( [ 1, 2, 3, 4 ] );
* var mask = toAccessorArray( [ 0, 1, 0, 1 ] );
*
* function scale( x ) {
* return x * 10;
* }
*
* var out = toAccessorArray( [ 0, 0, 0, 0 ] );
* var arr = accessors( arraylike2object( x ), arraylike2object( mask ), arraylike2object( out ), 1, 0, scale );
*
* var v = arr.get( 0 );
* // returns 20
*
* v = arr.get( 1 );
* // returns 40
*/
function accessors( x, mask, out, stride, offset, clbk, thisArg ) {
var xdata;
var mdata;
var odata;
var xget;
var mget;
var oset;
var io;
var i;
xdata = x.data;
mdata = mask.data;
odata = out.data;
xget = x.accessors[ 0 ];
mget = mask.accessors[ 0 ];
oset = out.accessors[ 1 ];
io = offset;
for ( i = 0; i < xdata.length; i++ ) {
if ( mget( mdata, i ) ) {
oset( odata, io, clbk.call( thisArg, xget( xdata, i ), i, xdata ) );
io += stride;
}
}
return odata;
}
// MAIN //
/**
* Applies a mask and a callback function to a provided input array and assigns results to elements in a provided output array.
*
* @param {Collection} x - input array
* @param {Collection} mask - mask array
* @param {Collection} out - output array
* @param {integer} stride - output array stride
* @param {NonNegativeInteger} offset - output array offset
* @param {Function} clbk - function to apply
* @param {*} [thisArg] - callback execution context
* @returns {Collection} output array
*
* @example
* var x = [ 1, 2, 3, 4 ];
* var mask = [ 0, 1, 0, 1 ];
*
* function scale( x ) {
* return x * 10;
* }
*
* var out = [ 0, 0 ];
* var arr = assign( x, mask, out, 1, 0, scale );
* // returns [ 20, 40 ]
*
* var bool = ( arr === out );
* // returns true
*/
function assign( x, mask, out, stride, offset, clbk, thisArg ) {
var xo;
var mo;
var oo;
xo = arraylike2object( x );
mo = arraylike2object( mask );
oo = arraylike2object( out );
if (
xo.accessorProtocol ||
mo.accessorProtocol ||
oo.accessorProtocol
) {
accessors( xo, mo, oo, stride, offset, clbk, thisArg );
return out;
}
indexed( x, mask, out, stride, offset, clbk, thisArg );
return out;
}
// EXPORTS //
module.exports = assign;
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