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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 numel = require( '@stdlib/ndarray/base/numel' );
var vind2bind = require( '@stdlib/ndarray/base/vind2bind' );
// VARIABLES //
var MODE = 'throw';
// MAIN //
/**
* Applies a mask to a provided input ndarray and assigns unmasked values to elements in a provided one-dimensional output ndarray.
*
* @private
* @param {Object} x - object containing input ndarray meta data
* @param {Object} mask - object containing mask ndarray meta data
* @param {Object} y - object containing output ndarray meta data
* @returns {void}
*
* @example
* var Float64Array = require( '@stdlib/array/float64' );
* var Uint8Array = require( '@stdlib/array/uint8' );
*
* // Define the shape of the array:
* var shape = [ 2, 2 ];
*
* // Define the array strides:
* var sx = [ 2, 1 ];
* var sm = [ 2, 1 ];
* var sy = [ 1 ];
*
* // Define the index offset:
* var ox = 1;
* var om = 0;
*
* var x = {
* 'dtype': 'float64',
* 'data': new Float64Array( [ 1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0 ] ),
* 'shape': shape,
* 'strides': sx,
* 'offset': ox,
* 'order': 'row-major'
* };
*
* var mask = {
* 'dtype': 'uint8',
* 'data': new Uint8Array( [ 1, 0, 1, 0 ] ),
* 'shape': shape,
* 'strides': sm,
* 'offset': om,
* 'order': 'row-major'
* };
*
* var y = {
* 'dtype': 'float64',
* 'data': new Float64Array( 2 ),
* 'shape': [ 2 ],
* 'strides': sy,
* 'offset': 0,
* 'order': 'row-major'
* };
*
* mskfilternd( x, mask, y );
*
* console.log( y.data );
* // => <Float64Array>[ 2.0, 4.0 ]
*/
function mskfilternd( x, mask, y ) {
var xbuf;
var mbuf;
var ybuf;
var ordx;
var ordm;
var len;
var sh;
var sx;
var sm;
var dy;
var ox;
var om;
var oy;
var ix;
var im;
var iy;
var i;
sh = x.shape;
// Compute the total number of elements over which to iterate:
len = numel( sh );
// Cache references to the input, mask and output ndarray data buffers:
xbuf = x.data;
mbuf = mask.data;
ybuf = y.data;
// Cache references to the respective stride arrays:
sx = x.strides;
sm = mask.strides;
dy = y.strides[ 0 ];
// Cache the indices of the first indexed elements in the respective ndarrays:
ox = x.offset;
om = mask.offset;
oy = y.offset;
// Cache the respective array orders:
ordx = x.order;
ordm = mask.order;
iy = oy;
// Iterate over each element based on the linear **view** index, regardless as to how the data is stored in memory...
for ( i = 0; i < len; i++ ) {
ix = vind2bind( sh, sx, ox, ordx, i, MODE );
im = vind2bind( sh, sm, om, ordm, i, MODE );
if ( mbuf[ im ] ) {
ybuf[ iy ] = xbuf[ ix ];
iy += dy;
}
}
}
// EXPORTS //
module.exports = mskfilternd;
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