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<?php declare(strict_types=1);
/*
 * This file is part of PHPUnit.
 *
 * (c) Sebastian Bergmann <sebastian@phpunit.de>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */
namespace PHPUnit\Util;

use const ENT_SUBSTITUTE;
use const PHP_SAPI;
use function assert;
use function count;
use function dirname;
use function explode;
use function fclose;
use function fflush;
use function flush;
use function fopen;
use function fsockopen;
use function fwrite;
use function htmlspecialchars;
use function is_resource;
use function is_string;
use function sprintf;
use function str_replace;
use function strncmp;
use function strpos;
use PHPUnit\Framework\Exception;

/**
 * @internal This class is not covered by the backward compatibility promise for PHPUnit
 */
class Printer
{
    /**
     * If true, flush output after every write.
     *
     * @var bool
     */
    protected $autoFlush = false;

/**
     * @psalm-var resource|closed-resource
     */
    protected $out;

/**
     * @var string
     */
    protected $outTarget;

/**
     * Constructor.
     *
     * @param null|resource|string $out
     *
     * @throws Exception
     */
    public function __construct($out = null)
    {
        if ($out === null) {
            return;
        }

if (is_string($out) === false) {
            $this->out = $out;

return;
        }

if (strpos($out, 'socket://') === 0) {
            $out = explode(':', str_replace('socket://', '', $out));

if (count($out) !== 2) {
                throw new Exception;
            }

$this->out = fsockopen($out[0], $out[1]);
        } else {
            if (strpos($out, 'php://') === false && !Filesystem::createDirectory(dirname($out))) {
                throw new Exception(sprintf('Directory "%s" was not created', dirname($out)));
            }

$this->out = fopen($out, 'wt');
        }

$this->outTarget = $out;
    }

/**
     * Flush buffer and close output if it's not to a PHP stream.
     */
    public function flush(): void
    {
        if ($this->out && strncmp($this->outTarget, 'php://', 6) !== 0) {
            assert(is_resource($this->out));

fclose($this->out);
        }
    }

/**
     * Performs a safe, incremental flush.
     *
     * Do not confuse this function with the flush() function of this class,
     * since the flush() function may close the file being written to, rendering
     * the current object no longer usable.
     */
    public function incrementalFlush(): void
    {
        if ($this->out) {
            assert(is_resource($this->out));

fflush($this->out);
        } else {
            flush();
        }
    }

public function write(string $buffer): void
    {
        if ($this->out) {
            assert(is_resource($this->out));

fwrite($this->out, $buffer);

if ($this->autoFlush) {
                $this->incrementalFlush();
            }
        } else {
            if (PHP_SAPI !== 'cli' && PHP_SAPI !== 'phpdbg') {
                $buffer = htmlspecialchars($buffer, ENT_SUBSTITUTE);
            }

print $buffer;

if ($this->autoFlush) {
                $this->incrementalFlush();
            }
        }
    }

/**
     * Check auto-flush mode.
     */
    public function getAutoFlush(): bool
    {
        return $this->autoFlush;
    }

/**
     * Set auto-flushing mode.
     *
     * If set, *incremental* flushes will be done after each write. This should
     * not be confused with the different effects of this class' flush() method.
     */
    public function setAutoFlush(bool $autoFlush): void
    {
        $this->autoFlush = $autoFlush;
    }
}