class SourceContextProvider

final class SourceContextProvider implements ContextProviderInterface {
    public function __construct(?string $charset = null, ?string $projectDir = null, ?FileLinkFormatter $fileLinkFormatter = null, int $limit = 9) {
    }
    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 = '-' === $file || 'Standard input code' === $file ? 'Standard input code' : 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']) && !str_starts_with($trace[$i]['function'], 'call_user_func')) {
                        $file = $trace[$i]['file'];
                        $line = $trace[$i]['line'];
                        break;
                    }
                    elseif (isset($trace[$i]['object']) && $trace[$i]['object'] instanceof Template) {
                        $template = $trace[$i]['object'];
                        $name = $template->getTemplateName();
                        $src = method_exists($template, 'getSourceContext') ? $template->getSourceContext()
                            ->getCode() : (method_exists($template, 'getSource') ? $template->getSource() : false);
                        $info = $template->getDebugInfo();
                        if (isset($info[$trace[$i - 1]['line']])) {
                            $line = $info[$trace[$i - 1]['line']];
                            $file = method_exists($template, 'getSourceContext') ? $template->getSourceContext()
                                ->getPath() : null;
                            if ($src) {
                                $src = explode("\n", $src);
                                $fileExcerpt = [];
                                for ($i = max($line - 3, 1), $max = min($line + 3, \count($src)); $i <= $max; ++$i) {
                                    $fileExcerpt[] = '<li' . ($i === $line ? ' class="selected"' : '') . '><code>' . $this->htmlEncode($src[$i - 1]) . '</code></li>';
                                }
                                $fileExcerpt = '<ol start="' . max($line - 3, 1) . '">' . implode("\n", $fileExcerpt) . '</ol>';
                            }
                        }
                        break;
                    }
                }
                break;
            }
        }
        if (false === $name) {
            $name = str_replace('\\', '/', $file);
            $name = substr($name, strrpos($name, '/') + 1);
        }
        $context = [
            'name' => $name,
            'file' => $file,
            'line' => $line,
        ];
        $context['file_excerpt'] = $fileExcerpt;
        if (null !== $this->projectDir) {
            $context['project_dir'] = $this->projectDir;
            if (str_starts_with($file, $this->projectDir)) {
                $context['file_relative'] = ltrim(substr($file, \strlen($this->projectDir)), \DIRECTORY_SEPARATOR);
            }
        }
        if ($this->fileLinkFormatter && ($fileLink = $this->fileLinkFormatter
            ->format($context['file'], $context['line']))) {
            $context['file_link'] = $fileLink;
        }
        return $context;
    }
    private function htmlEncode(string $s) : string {
        $html = '';
        $dumper = new HtmlDumper(function ($line) use (&$html) {
            $html .= $line;
        }, $this->charset);
        $dumper->setDumpHeader('');
        $dumper->setDumpBoundaries('', '');
        $cloner = new VarCloner();
        $dumper->dump($cloner->cloneVar($s));
        return substr(strip_tags($html), 1, -1);
    }

}