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<?php
/**
* CakePHP(tm) : Rapid Development Framework (https://cakephp.org)
* Copyright (c) Cake Software Foundation, Inc. (https://cakefoundation.org)
*
* Licensed under The MIT License
* For full copyright and license information, please see the LICENSE.txt
* Redistributions of files must retain the above copyright notice.
*
* @copyright Copyright (c) Cake Software Foundation, Inc. (https://cakefoundation.org)
* @link https://cakephp.org CakePHP(tm) Project
* @since 2.0.0
* @license https://opensource.org/licenses/mit-license.php MIT License
*/
namespace Cake\Console;
/**
* Object wrapper for interacting with stdin
*/
class ConsoleInput
{
/**
* Input value.
*
* @var resource
*/
protected $_input;
/**
* Can this instance use readline?
* Two conditions must be met:
* 1. Readline support must be enabled.
* 2. Handle we are attached to must be stdin.
* Allows rich editing with arrow keys and history when inputting a string.
*
* @var bool
*/
protected $_canReadline;
/**
* Constructor
*
* @param string $handle The location of the stream to use as input.
*/
public function __construct($handle = 'php://stdin')
{
$this->_canReadline = (extension_loaded('readline') && $handle === 'php://stdin');
$this->_input = fopen($handle, 'rb');
}
/**
* Read a value from the stream
*
* @return mixed The value of the stream
*/
public function read()
{
if ($this->_canReadline) {
$line = readline('');
if (strlen($line) > 0) {
readline_add_history($line);
}
return $line;
}
return fgets($this->_input);
}
/**
* Check if data is available on stdin
*
* @param int $timeout An optional time to wait for data
* @return bool True for data available, false otherwise
*/
public function dataAvailable($timeout = 0)
{
$readFds = [$this->_input];
$readyFds = stream_select($readFds, $writeFds, $errorFds, $timeout);
return ($readyFds > 0);
}
}