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Revision Autor Zeilennr. Zeile
148 lars 1 
<?php
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/*
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 * This file is part of Psy Shell.
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 *
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 * (c) 2012-2023 Justin Hileman
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 *
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 * For the full copyright and license information, please view the LICENSE
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 * file that was distributed with this source code.
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 */
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namespace Psy\TabCompletion;
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use Psy\TabCompletion\Matcher\AbstractMatcher;
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/**
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 * A readline tab completion service.
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 *
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 * @author Marc Garcia <markcial@gmail.com>
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 */
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class AutoCompleter
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{
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    /** @var Matcher\AbstractMatcher[] */
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    protected $matchers;
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    /**
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     * Register a tab completion Matcher.
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     *
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     * @param AbstractMatcher $matcher
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     */
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    public function addMatcher(AbstractMatcher $matcher)
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    {
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        $this->matchers[] = $matcher;
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    }
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    /**
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     * Activate readline tab completion.
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     */
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    public function activate()
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    {
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        \readline_completion_function([&$this, 'callback']);
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    }
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    /**
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     * Handle readline completion.
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     *
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     * @param string $input Readline current word
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     * @param int    $index Current word index
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     * @param array  $info  readline_info() data
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     *
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     * @return array
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     */
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    public function processCallback(string $input, int $index, array $info = []): array
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    {
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        // Some (Windows?) systems provide incomplete `readline_info`, so let's
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        // try to work around it.
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        $line = $info['line_buffer'];
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        if (isset($info['end'])) {
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            $line = \substr($line, 0, $info['end']);
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        }
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        if ($line === '' && $input !== '') {
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            $line = $input;
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        }
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        $tokens = \token_get_all('<?php '.$line);
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        // remove whitespaces
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        $tokens = \array_filter($tokens, function ($token) {
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            return !AbstractMatcher::tokenIs($token, AbstractMatcher::T_WHITESPACE);
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        });
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        // reset index from 0 to remove missing index number
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        $tokens = \array_values($tokens);
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        $matches = [];
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        foreach ($this->matchers as $matcher) {
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            if ($matcher->hasMatched($tokens)) {
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                $matches = \array_merge($matcher->getMatches($tokens), $matches);
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            }
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        }
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        $matches = \array_unique($matches);
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        return !empty($matches) ? $matches : [''];
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    }
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    /**
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     * The readline_completion_function callback handler.
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     *
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     * @see processCallback
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     *
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     * @param string $input
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     * @param int    $index
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     *
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     * @return array
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     */
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    public function callback(string $input, int $index): array
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    {
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        return $this->processCallback($input, $index, \readline_info());
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    }
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    /**
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     * Remove readline callback handler on destruct.
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     */
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    public function __destruct()
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    {
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        // PHP didn't implement the whole readline API when they first switched
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        // to libedit. And they still haven't.
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        if (\function_exists('readline_callback_handler_remove')) {
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            \readline_callback_handler_remove();
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        }
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    }
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}