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<?php /* * This file is part of Psy Shell. * * (c) 2012-2015 Justin Hileman * * For the full copyright and license information, please view the LICENSE * file that was distributed with this source code. */ namespace Psy\Readline; use Psy\Exception\BreakException; /** * An array-based Readline emulation implementation. */ class Transient implements Readline { private $history; private $historySize; private $eraseDups; /** * Transient Readline is always supported. * * {@inheritdoc} */ public static function isSupported() { return true; } /** * Transient Readline constructor. */ public function __construct($historyFile = null, $historySize = 0, $eraseDups = false) { // don't do anything with the history file... $this->history = array(); $this->historySize = $historySize; $this->eraseDups = $eraseDups; } /** * {@inheritdoc} */ public function addHistory($line) { if ($this->eraseDups) { if (($key = array_search($line, $this->history)) !== false) { unset($this->history[$key]); } } $this->history[] = $line; if ($this->historySize > 0) { $histsize = count($this->history); if ($histsize > $this->historySize) { $this->history = array_slice($this->history, $histsize - $this->historySize); } } $this->history = array_values($this->history); return true; } /** * {@inheritdoc} */ public function clearHistory() { $this->history = array(); return true; } /** * {@inheritdoc} */ public function listHistory() { return $this->history; } /** * {@inheritdoc} */ public function readHistory() { return true; } /** * {@inheritdoc} * * @throws BreakException if user hits Ctrl+D * * @return string */ public function readline($prompt = null) { echo $prompt; return rtrim(fgets($this->getStdin(), 1024)); } /** * {@inheritdoc} */ public function redisplay() { // noop } /** * {@inheritdoc} */ public function writeHistory() { return true; } /** * Get a STDIN file handle. * * @throws BreakException if user hits Ctrl+D * * @return resource */ private function getStdin() { if (!isset($this->stdin)) { $this->stdin = fopen('php://stdin', 'r'); } if (feof($this->stdin)) { throw new BreakException('Ctrl+D'); } return $this->stdin; } }