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* @license Apache-2.0
*
* Copyright (c) 2026 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 isUndefinedOrNull = require( '@stdlib/assert/is-undefined-or-null' );
var resolveGetter = require( '@stdlib/array/base/resolve-getter' );
var gjoin = require( '@stdlib/blas/ext/base/gjoin' ).ndarray;
// VARIABLES //
var SEP = ', ';
var SPACE = ' ';
// FUNCTIONS //
/**
* Returns the string representation of an array element.
*
* @private
* @param {Function} get - accessor function
* @param {Collection} x - input array
* @param {integer} idx - element index
* @returns {string} string representation
*/
function str( get, x, idx ) {
var v = get( x, idx );
if ( isUndefinedOrNull( v ) ) {
return '';
}
return String( v );
}
// MAIN //
/**
* Returns a string created by joining strided array elements into a human-readable list using a conjunction and alternative indexing semantics.
*
* @param {PositiveInteger} N - number of indexed elements
* @param {string} prefix - string to prepend
* @param {string} suffix - string to append
* @param {string} conjunction - conjunction before the last element
* @param {boolean} oxfordComma - boolean specifying whether to include an Oxford comma
* @param {Collection} x - input array
* @param {integer} strideX - stride length
* @param {NonNegativeInteger} offsetX - starting index
* @returns {string} joined string
*
* @example
* var x = [ 1, 2, 3, 4 ];
*
* var out = gconjoin( x.length, '', '', 'and', true, x, 1, 0 );
* // returns '1, 2, 3, and 4'
*/
function gconjoin( N, prefix, suffix, conjunction, oxfordComma, x, strideX, offsetX ) { // eslint-disable-line max-len
var last;
var out;
var get;
if ( N <= 0 ) {
return prefix + suffix;
}
if ( conjunction === '' || N === 1 ) {
return prefix + gjoin( N, SEP, x, strideX, offsetX ) + suffix;
}
get = resolveGetter( x );
out = prefix + gjoin( N-1, SEP, x, strideX, offsetX );
last = str( get, x, offsetX + ( (N-1) * strideX ) );
if ( N >= 3 && oxfordComma ) {
return out + SEP + conjunction + SPACE + last + suffix;
}
return out + SPACE + conjunction + SPACE + last + suffix;
}
// EXPORTS //
module.exports = gconjoin;
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