vendor/symfony/console/Output/ConsoleOutput.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\Console\Output;

use Symfony\Component\Console\Formatter\OutputFormatterInterface;

class ConsoleOutput extends StreamOutput implements ConsoleOutputInterface
{
    private $stderr;

    public function __construct($verbosity = self::VERBOSITY_NORMAL, $decorated = null, OutputFormatterInterface $formatter = null)
    {
        parent::__construct($this->openOutputStream(), $verbosity, $decorated, $formatter);

        $this->stderr = new StreamOutput($this->openErrorStream(), $verbosity, $decorated, $this->getFormatter());
    }

    public function setDecorated($decorated)
    {
        parent::setDecorated($decorated);
        $this->stderr->setDecorated($decorated);
    }

    public function setFormatter(OutputFormatterInterface $formatter)
    {
        parent::setFormatter($formatter);
        $this->stderr->setFormatter($formatter);
    }

    public function setVerbosity($level)
    {
        parent::setVerbosity($level);
        $this->stderr->setVerbosity($level);
    }

    public function getErrorOutput()
    {
        return $this->stderr;
    }

    public function setErrorOutput(OutputInterface $error)
    {
        $this->stderr = $error;
    }

    protected function hasStdoutSupport()
    {
        return false === $this->isRunningOS400();
    }

    protected function hasStderrSupport()
    {
        return false === $this->isRunningOS400();
    }

    private function isRunningOS400()
    {
        return 'OS400' === php_uname('s');
    }

    private function openOutputStream()
    {
        $outputStream = $this->hasStdoutSupport() ? 'php://stdout' : 'php://output';

        return @fopen($outputStream, 'w') ?: fopen('php://output', 'w');
    }

    private function openErrorStream()
    {
        $errorStream = $this->hasStderrSupport() ? 'php://stderr' : 'php://output';

        return fopen($errorStream, 'w');
    }
}