File: src/Filters/SliceFilter.php

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File: src/Filters/SliceFilter.php
Role: Class source
Content type: text/plain
Description: Class source
Class: PHP JSON Path
Query values from data structures like XPATH
Author: By
Last change:
Date: 10 months ago
Size: 1,375 bytes
 

Contents

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<?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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