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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.
*/
/* eslint-disable max-params, max-len */
'use strict';
// MODULES //
var arraylike2object = require( '@stdlib/array/base/arraylike2object' );
var gcopy = require( '@stdlib/blas/base/gcopy' );
var accessors = require( './accessors.js' );
// MAIN //
/**
* Calculates the differences between consecutive elements of a strided array using alternative indexing semantics.
*
* @param {PositiveInteger} N - number of indexed elements
* @param {Collection} x - input array
* @param {integer} strideX - stride length for `x`
* @param {NonNegativeInteger} offsetX - starting index for `x`
* @param {PositiveInteger} N1 - number of indexed elements of prepend
* @param {Collection} prepend - prepend array
* @param {integer} strideP - stride length for `prepend`
* @param {NonNegativeInteger} offsetP - starting index for `prepend`
* @param {PositiveInteger} N2 - number of indexed elements of append
* @param {Collection} append - append array
* @param {integer} strideA - stride length for `append`
* @param {NonNegativeInteger} offsetA - starting index for `append`
* @param {Collection} out - output array
* @param {integer} strideOut - stride length for `out`
* @param {NonNegativeInteger} offsetOut - starting index for `out`
* @returns {Collection} output array
*
* @example
* var x = [ 2.0, 4.0, 7.0, 11.0, 16.0 ];
* var p = [ 1.0 ];
* var a = [ 22.0 ];
* var out = [ 0.0, 0.0, 0.0, 0.0, 0.0, 0.0 ];
*
* gediff( x.length, x, 1, 0, 1, p, 1, 0, 1, a, 1, 0, out, 1, 0 );
*
* console.log( out );
* // => [ 1.0, 2.0, 3.0, 4.0, 5.0, 22.0 ]
*/
function gediff( N, x, strideX, offsetX, N1, prepend, strideP, offsetP, N2, append, strideA, offsetA, out, strideOut, offsetOut ) {
var total;
var prev;
var curr;
var ox;
var oo;
var op;
var oa;
var ix;
var io;
var i;
total = N + N1 + N2;
if ( total <= 1 ) {
return out;
}
ox = arraylike2object( x );
oo = arraylike2object( out );
op = arraylike2object( prepend );
oa = arraylike2object( append );
if ( ox.accessorProtocol || oo.accessorProtocol || op.accessorProtocol || oa.accessorProtocol ) {
accessors( N, ox, strideX, offsetX, N1, op, strideP, offsetP, N2, oa, strideA, offsetA, oo, strideOut, offsetOut );
return oo.data;
}
// Copy `prepend` into output array:
gcopy.ndarray( N1, prepend, strideP, offsetP, out, strideOut, offsetOut );
// Compute differences of input array:
ix = offsetX;
io = offsetOut + ( N1 * strideOut );
prev = x[ ix ];
for ( i = 1; i < N; i++ ) {
ix += strideX;
curr = x[ ix ];
out[ io ] = curr - prev;
prev = curr;
io += strideOut;
}
// Copy `append` into output array:
gcopy.ndarray( N2, append, strideA, offsetA, out, strideOut, io );
return out;
}
// EXPORTS //
module.exports = gediff;
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