vendor/symfony/var-dumper/Dumper/ContextProvider/SourceContextProvider.php

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<?php

/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier <fabien@symfony.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Symfony\Component\VarDumper\Dumper\ContextProvider;

use Symfony\Component\HttpKernel\Debug\FileLinkFormatter;
use Symfony\Component\VarDumper\Cloner\VarCloner;
use Symfony\Component\VarDumper\Dumper\HtmlDumper;
use Symfony\Component\VarDumper\VarDumper;
use Twig\Template;

/**
 * Tries to provide context from sources (class name, file, line, code excerpt, ...).
 *
 * @author Nicolas Grekas <p@tchwork.com>
 * @author Maxime Steinhausser <maxime.steinhausser@gmail.com>
 */
final class SourceContextProvider implements ContextProviderInterface
{
    private $limit;
    private $charset;
    private $projectDir;
    private $fileLinkFormatter;

    public function __construct(string $charset = null, string $projectDir = null, FileLinkFormatter $fileLinkFormatter = null, int $limit = 9)
    {
        $this->charset = $charset;
        $this->projectDir = $projectDir;
        $this->fileLinkFormatter = $fileLinkFormatter;
        $this->limit = $limit;
    }

    public function getContext(): ?array
    {
        $trace = debug_backtrace(\DEBUG_BACKTRACE_PROVIDE_OBJECT | \DEBUG_BACKTRACE_IGNORE_ARGS, $this->limit);

        $file = $trace[1]['file'];
        $line = $trace[1]['line'];
        $name = false;
        $fileExcerpt = false;

        for ($i = 2; $i < $this->limit; ++$i) {
            if (isset($trace[$i]['class'], $trace[$i]['function'])
                && 'dump' === $trace[$i]['function']
                && VarDumper::class === $trace[$i]['class']
            ) {
                $file = $trace[$i]['file'] ?? $file;
                $line = $trace[$i]['line'] ?? $line;

                while (++$i < $this->limit) {
                    if (isset($trace[$i]['function'], $trace[$i]['file']) && empty($trace[$i]['class']) && 0 !== strpos($trace[$i]['function'], 'call_user_func')) {
                        $file = $trace[$i]['file'];