TrimmedBufferOutput.php

<?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\Console\Output;

use Symfony\Component\Console\Exception\InvalidArgumentException;
use Symfony\Component\Console\Formatter\OutputFormatterInterface;

/**
 * A BufferedOutput that keeps only the last N chars.
 *
 * @author Jérémy Derussé <jeremy@derusse.com>
 */
class TrimmedBufferOutput extends Output {
    private int $maxLength;
    private string $buffer = '';
    public function __construct(int $maxLength, ?int $verbosity = self::VERBOSITY_NORMAL, bool $decorated = false, ?OutputFormatterInterface $formatter = null) {
        if ($maxLength <= 0) {
            throw new InvalidArgumentException(\sprintf('"%s()" expects a strictly positive maxLength. Got %d.', __METHOD__, $maxLength));
        }
        parent::__construct($verbosity, $decorated, $formatter);
        $this->maxLength = $maxLength;
    }
    
    /**
     * Empties buffer and returns its content.
     */
    public function fetch() : string {
        $content = $this->buffer;
        $this->buffer = '';
        return $content;
    }
    protected function doWrite(string $message, bool $newline) : void {
        $this->buffer .= $message;
        if ($newline) {
            $this->buffer .= \PHP_EOL;
        }
        $this->buffer = substr($this->buffer, -$this->maxLength);
    }

}