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Editing: ArrayExpression.php

<?php

/*
 * This file is part of Twig.
 *
 * (c) Fabien Potencier
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Twig\Node\Expression;

use Twig\Compiler;

class ArrayExpression extends AbstractExpression
{
    private $index;

public function __construct(array $elements, int $lineno)
    {
        parent::__construct($elements, [], $lineno);

$this->index = -1;
        foreach ($this->getKeyValuePairs() as $pair) {
            if ($pair['key'] instanceof ConstantExpression && ctype_digit((string) $pair['key']->getAttribute('value')) && $pair['key']->getAttribute('value') > $this->index) {
                $this->index = $pair['key']->getAttribute('value');
            }
        }
    }

public function getKeyValuePairs(): array
    {
        $pairs = [];
        foreach (array_chunk($this->nodes, 2) as $pair) {
            $pairs[] = [
                'key' => $pair[0],
                'value' => $pair[1],
            ];
        }

return $pairs;
    }

public function hasElement(AbstractExpression $key): bool
    {
        foreach ($this->getKeyValuePairs() as $pair) {
            // we compare the string representation of the keys
            // to avoid comparing the line numbers which are not relevant here.
            if ((string) $key === (string) $pair['key']) {
                return true;
            }
        }

return false;
    }

public function addElement(AbstractExpression $value, AbstractExpression $key = null): void
    {
        if (null === $key) {
            $key = new ConstantExpression(++$this->index, $value->getTemplateLine());
        }

array_push($this->nodes, $key, $value);
    }

public function compile(Compiler $compiler): void
    {
        $compiler->raw('[');
        $first = true;
        foreach ($this->getKeyValuePairs() as $pair) {
            if (!$first) {
                $compiler->raw(', ');
            }
            $first = false;

$compiler
                ->subcompile($pair['key'])
                ->raw(' => ')
                ->subcompile($pair['value'])
            ;
        }
        $compiler->raw(']');
    }
}

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