<?php
/**
* JSONPath implementation for PHP.
*
* @license https://github.com/SoftCreatR/JSONPath/blob/main/LICENSE MIT License
*/
declare(strict_types=1);
namespace Flow\JSONPath\Filters;
use Flow\JSONPath\AccessHelper;
use function count;
class SliceFilter extends AbstractFilter
{
/**
* @inheritDoc
*/
public function filter($collection): array
{
$length = count($collection);
$start = $this->token->value['start'];
$end = $this->token->value['end'];
$step = $this->token->value['step'] ?: 1;
if ($start === null) {
$start = 0;
}
if ($start < 0) {
$start = $length + $start;
if ($start < 0) {
$start = 0;
}
}
if ($end === null) {
// negative index start means the end is -1, else the end is the last index
$end = $length;
}
if ($end < 0) {
$end = $length + $end;
}
$result = [];
for ($i = $start; $i < $end; $i += $step) {
$index = $i;
if ($i < 0) {
$index = $length + $i;
}
if (AccessHelper::keyExists($collection, $index, $this->magicIsAllowed)) {
$result[] = $collection[$index];
}
}
return $result;
}
}
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