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<?php
/*
* This file is part of Psy Shell.
*
* (c) 2012-2017 Justin Hileman
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Psy\TabCompletion;
use Psy\TabCompletion\Matcher\AbstractMatcher;
/**
* A readline tab completion service.
*
* @author Marc Garcia <markcial@gmail.com>
*/
class AutoCompleter
{
/** @var Matcher\AbstractMatcher[] */
protected $matchers;
/**
* Register a tab completion Matcher.
*
* @param AbstractMatcher $matcher
*/
public function addMatcher(AbstractMatcher $matcher)
{
$this->matchers[] = $matcher;
}
/**
* Activate readline tab completion.
*/
public function activate()
{
readline_completion_function(array(&$this, 'callback'));
}
/**
* Handle readline completion.
*
* @param string $input Readline current word
* @param int $index Current word index
* @param array $info readline_info() data
*
* @return array
*/
public function processCallback($input, $index, $info = array())
{
// Some (Windows?) systems provide incomplete `readline_info`, so let's
// try to work around it.
$line = $info['line_buffer'];
if (isset($info['end'])) {
$line = substr($line, 0, $info['end']);
}
if ($line === '' && $input !== '') {
$line = $input;
}
$tokens = token_get_all('<?php ' . $line);
// remove whitespaces
$tokens = array_filter($tokens, function ($token) {
return !AbstractMatcher::tokenIs($token, AbstractMatcher::T_WHITESPACE);
});
$matches = array();
foreach ($this->matchers as $matcher) {
if ($matcher->hasMatched($tokens)) {
$matches = array_merge($matcher->getMatches($tokens), $matches);
}
}
$matches = array_unique($matches);
return !empty($matches) ? $matches : array('');
}
/**
* The readline_completion_function callback handler.
*
* @see processCallback
*
* @param $input
* @param $index
*
* @return array
*/
public function callback($input, $index)
{
return $this->processCallback($input, $index, readline_info());
}
/**
* Remove readline callback handler on destruct.
*/
public function __destruct()
{
// PHP didn't implement the whole readline API when they first switched
// to libedit. And they still haven't.
//
// So this is a thing to make PsySH work on 5.3.x:
if (function_exists('readline_callback_handler_remove')) {
readline_callback_handler_remove();
}
}
}