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* @license Apache-2.0
*
* Copyright (c) 2023 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 setReadOnly = require( '@stdlib/utils/define-nonenumerable-read-only-property' );
var isFunction = require( '@stdlib/assert/is-function' );
var isIteratorLike = require( '@stdlib/assert/is-iterator-like' );
var iteratorSymbol = require( '@stdlib/symbol/iterator' );
var ndarray2array = require( '@stdlib/ndarray/to-array' );
var format = require( '@stdlib/string/format' );
// MAIN //
/**
* Returns an iterator which converts each iterated ndarray to a generic array.
*
* @param {Iterator} iterator - input iterator
* @throws {TypeError} must provide an iterator protocol-compliant object
* @returns {Iterator} iterator
*
* @example
* var array = require( '@stdlib/ndarray/array' );
* var ndarray2array = require( '@stdlib/ndarray/to-array' );
* var nditerRows = require( '@stdlib/ndarray/iter/rows' );
*
* var x = array( [ [ [ 1, 2 ], [ 3, 4 ] ], [ [ 5, 6 ], [ 7, 8 ] ] ] );
* // returns <ndarray>
*
* var iter = nditer2arrayEach( nditerRows( x ) );
*
* var v = iter.next().value;
* // returns [ 1, 2 ]
*
* v = iter.next().value;
* // returns [ 3, 4 ]
*
* v = iter.next().value;
* // returns [ 5, 6 ]
*
* // ...
*/
function nditer2arrayEach( iterator ) {
var iter;
var FLG;
if ( !isIteratorLike( iterator ) ) {
throw new TypeError( format( 'invalid argument. First argument must be an iterator protocol-compliant object. Value: `%s`.', iterator ) );
}
// Create an iterator protocol-compliant object:
iter = {};
setReadOnly( iter, 'next', next );
setReadOnly( iter, 'return', end );
// If an environment supports `Symbol.iterator` and a provided iterator is iterable, make the iterator iterable:
if ( iteratorSymbol && isFunction( iterator[ iteratorSymbol ] ) ) {
setReadOnly( iter, iteratorSymbol, factory );
}
return iter;
/**
* Returns an iterator protocol-compliant object containing the next iterated value.
*
* @private
* @returns {Object} iterator protocol-compliant object
*/
function next() {
var v;
if ( FLG ) {
return {
'done': true
};
}
v = iterator.next();
if ( v.done ) {
FLG = true;
return v;
}
return {
'value': ndarray2array( v.value ),
'done': false
};
}
/**
* Finishes an iterator.
*
* @private
* @param {*} [value] - value to return
* @returns {Object} iterator protocol-compliant object
*/
function end( value ) {
FLG = true;
if ( arguments.length ) {
return {
'value': value,
'done': true
};
}
return {
'done': true
};
}
/**
* Returns a new iterator.
*
* @private
* @returns {Iterator} iterator
*/
function factory() {
return nditer2arrayEach( iterator[ iteratorSymbol ]() );
}
}
// EXPORTS //
module.exports = nditer2arrayEach;
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