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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 isComplexDataType = require( '@stdlib/array/base/assert/is-complex-floating-point-data-type' );
var arraylike2object = require( '@stdlib/array/base/arraylike2object' );
var reinterpret = require( '@stdlib/strided/base/reinterpret-complex' );
// FUNCTIONS //
/**
* Applies a mask to an indexed array, maps the unmasked values according to a callback function, and assigns 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] - function context
* @returns {Collection} output array
*
* @example
* var x = [ 1, 2, 3, 4 ];
* var mask = [ 0, 1, 0, 1 ];
*
* var out = [ 0, 0, 0, 0 ];
*
* var arr = indexed( x, mask, out, 1, 0, function( val ) {
* return val * 2;
* } );
* // returns [ 2, 6, 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 to an accessor array, maps the unmasked values according to a callback function, and assigns to elements in an accessor output 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] - function 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 ] );
*
* var out = toAccessorArray( [ 0, 0, 0, 0 ] );
* var arr = accessors( arraylike2object( x ), arraylike2object( mask ), arraylike2object( out ), 1, 0, function( val ) {
* return val * 2;
* } );
*
* var v = arr.get( 0 );
* // returns 2
*
* v = arr.get( 1 );
* // returns 6
*/
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;
}
/**
* Applies a mask to a complex array, maps the unmasked values according to a callback function, and assigns to elements in a complex output array.
*
* @private
* @param {Collection} x - real-valued floating-point input array view
* @param {Object} mask - mask array object
* @param {Collection} out - real-valued floating-point output array view
* @param {integer} stride - output array stride
* @param {NonNegativeInteger} offset - output array offset
* @param {Function} clbk - function to apply
* @param {*} [thisArg] - function context
* @returns {Collection} output array view
*
* @example
* var Float64Array = require( '@stdlib/array/float64' );
* var arraylike2object = require( '@stdlib/array/base/arraylike2object' );
*
* var x = new Float64Array( [ 1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0 ] );
* var mask = [ 0, 1, 0, 1 ];
*
* var out = new Float64Array( 8 );
*
* var arr = complex( x, arraylike2object( mask ), out, 1, 0, function( val ) {
* return val * 2;
* } );
* // returns <Float64Array>[ 2.0, 4.0, 10.0, 12.0, 0.0, 0.0, 0.0, 0.0 ]
*/
function complex( x, mask, out, stride, offset, clbk, thisArg ) {
var mdata;
var mget;
var io;
var so;
var i;
var j;
mdata = mask.data;
mget = mask.accessors[ 0 ];
so = stride * 2; // note: multiply by 2, as real-valued array consists of interleaved real and imaginary components
io = offset * 2;
for ( i = 0; i < mdata.length; i++ ) {
if ( !mget( mdata, i ) ) {
j = i * 2;
out[ io ] = clbk.call( thisArg, x[ j ], j, x );
out[ io+1 ] = clbk.call( thisArg, x[ j+1 ], j+1, x );
io += so;
}
}
return out;
}
// MAIN //
/**
* Applies a mask to a provided input array, maps the unmasked values according to a callback function, and assigns 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] - function context
* @returns {Collection} output array
*
* @example
* var x = [ 1, 2, 3, 4 ];
* var mask = [ 0, 1, 0, 1 ];
*
* var out = [ 0, 0 ];
* var arr = assign( x, mask, out, 1, 0, function( val ) {
* return val * 2;
* } );
* // returns [ 2, 6 ]
*
* 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
) {
// Note: we only explicitly support complex-to-complex, as this function should not be concerned with casting rules, etc. That is left to userland...
if (
isComplexDataType( xo.dtype ) &&
isComplexDataType( oo.dtype )
) {
complex( reinterpret( x, 0 ), mo, reinterpret( out, 0 ), stride, offset, clbk, thisArg ); // eslint-disable-line max-len
return out;
}
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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