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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';
// 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 BooleanArray = require( '@stdlib/array/bool' );
* var Complex64Array = require( '@stdlib/array/complex64' );
* var Complex64 = require( '@stdlib/complex/float32/ctor' );
* var realf = require( '@stdlib/complex/float32/real' );
* var imagf = require( '@stdlib/complex/float32/imag' );
*
* // Define the shape of the array:
* var shape = [ 3 ];
*
* // Define the array strides:
* var sx = [ 1 ];
* var sm = [ 1 ];
* var sy = [ 1 ];
*
* // Define the index offset:
* var ox = 0;
* var om = 0;
*
* // Define getters and setters:
* function getter( buf, idx ) {
* return buf.get( idx );
* }
*
* function setter( buf, idx, value ) {
* buf.set( value, idx );
* }
*
* var x = {
* 'dtype': 'complex64',
* 'data': new Complex64Array( [ 1.0, 2.0, 3.0, 4.0, 5.0, 6.0 ] ),
* 'shape': shape,
* 'strides': sx,
* 'offset': ox,
* 'order': 'row-major',
* 'accessors': [ getter, setter ]
* };
*
* var mask = {
* 'dtype': 'bool',
* 'data': new BooleanArray( [ 1, 0, 1 ] ),
* 'shape': shape,
* 'strides': sm,
* 'offset': om,
* 'order': 'row-major',
* 'accessors': [ getter, setter ]
* };
*
* var y = {
* 'dtype': 'complex64',
* 'data': new Complex64Array( 2 ),
* 'shape': [ 2 ],
* 'strides': sy,
* 'offset': 0,
* 'order': 'row-major',
* 'accessors': [ getter, setter ]
* };
*
* mskfilter1d( x, mask, y );
*
* var v = y.data.get( 0 );
* // returns <Complex64>
*
* var re = realf( v );
* // returns 1.0
*
* var im = imagf( v );
* // returns 2.0
*/
function mskfilter1d( x, mask, y ) {
var xbuf;
var mbuf;
var ybuf;
var mget;
var xget;
var yset;
var dx0;
var dm0;
var dy0;
var S0;
var ix;
var im;
var iy;
var i0;
// Extract loop variables: dimensions and loop offset (pointer) increments...
S0 = x.shape[ 0 ];
dx0 = x.strides[ 0 ];
dm0 = mask.strides[ 0 ];
dy0 = y.strides[ 0 ];
// Set the pointers to the first indexed elements in the respective ndarrays...
ix = x.offset;
im = mask.offset;
iy = y.offset;
// Cache references to the input, mask, and output ndarray buffers...
xbuf = x.data;
mbuf = mask.data;
ybuf = y.data;
// Cache accessors:
xget = x.accessors[ 0 ];
mget = mask.accessors[ 0 ];
yset = y.accessors[ 1 ];
// Iterate over the ndarray dimensions...
for ( i0 = 0; i0 < S0; i0++ ) {
if ( mget( mbuf, im ) ) {
yset( ybuf, iy, xget( xbuf, ix ) );
iy += dy0;
}
ix += dx0;
im += dm0;
}
}
// EXPORTS //
module.exports = mskfilter1d;
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