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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 getter = require( '@stdlib/array/base/getter' );
var accessorGetter = require( '@stdlib/array/base/accessor-getter' );
var Uint8Array = require( '@stdlib/array/uint8' );
var gcopy = require( '@stdlib/blas/base/gcopy' ).ndarray;
// MAIN //
/**
* Fills an output ArrayBuffer with array values.
*
* @private
* @param {Function} Struct - struct constructor
* @param {ArrayBuffer} buf - output data buffer
* @param {Collection} arr - input array
* @throws {TypeError} an input array must contain struct instances
* @throws {TypeError} each element of an input array must be a struct instance having the expected layout
* @returns {ArrayBuffer} output data buffer
*/
function fromArray( Struct, buf, arr ) {
var sbytes;
var bbytes;
var offset;
var layout;
var sview;
var opts;
var len;
var get;
var flg;
var nb;
var v;
var i;
opts = {
'format': 'layout'
};
len = arr.length;
if ( arr.get && arr.set ) {
get = accessorGetter( 'default' );
} else {
get = getter( 'default' );
}
layout = Struct.layout;
nb = Struct.byteLength;
// FIXME: add optimization for when `buf` is a StructArray having the same layout, as can just copy bytes
bbytes = new Uint8Array( buf );
offset = 0;
for ( i = 0; i < len; i++ ) {
v = get( arr, i );
try {
sview = Struct.viewOf( v ); // note: this should throw if `v` is not a struct
flg = true;
} catch ( err ) { // eslint-disable-line no-unused-vars
try {
// Attempt to convert the input value to a struct instance:
v = new Struct( v ); // note: this should throw if `v` is not an object with valid fields
} catch ( err ) { // eslint-disable-line no-unused-vars
return null;
}
sview = Struct.viewOf( v );
flg = false;
}
if ( flg && v.toString( opts ) !== layout ) {
return null;
}
sbytes = new Uint8Array( sview.buffer, sview.byteOffset, sview.byteLength ); // eslint-disable-line max-len
gcopy( nb, sbytes, 1, 0, bbytes, 1, offset );
offset += nb;
}
return buf;
}
// EXPORTS //
module.exports = fromArray;
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