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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\Util\Str; /** * A Libedit-based Readline implementation. * * This is largely the same as the Readline implementation, but it emulates * support for `readline_list_history` since PHP decided it was a good idea to * ship a fake Readline implementation that is missing history support. */ class Libedit extends GNUReadline { /** * Let's emulate GNU Readline by manually reading and parsing the history file! * * @return bool */ public static function isSupported() { return function_exists('readline') && !function_exists('readline_list_history'); } /** * {@inheritdoc} */ public function listHistory() { $history = file_get_contents($this->historyFile); if (!$history) { return array(); } // libedit doesn't seem to support non-unix line separators. $history = explode("\n", $history); // shift the history signature, ensure it's valid if (array_shift($history) !== '_HiStOrY_V2_') { return array(); } // decode the line $history = array_map(array($this, 'parseHistoryLine'), $history); // filter empty lines & comments return array_values(array_filter($history)); } /** * From GNUReadline (readline/histfile.c & readline/histexpand.c): * lines starting with "\0" are comments or timestamps; * if "\0" is found in an entry, * everything from it until the next line is a comment. * * @param string $line The history line to parse. * * @return string | null */ protected function parseHistoryLine($line) { // empty line, comment or timestamp if (!$line || $line[0] === "\0") { return; } // if "\0" is found in an entry, then // everything from it until the end of line is a comment. if (($pos = strpos($line, "\0")) !== false) { $line = substr($line, 0, $pos); } return ($line !== '') ? Str::unvis($line) : null; } }