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<?php /* * This file is part of Psy Shell. * * (c) 2012-2026 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\Completion\CompletionEngine; use Psy\Completion\CompletionRequest; use Psy\Completion\Source\MatcherAdapterSource; use Psy\TabCompletion\Matcher\AbstractMatcher; /** * A readline tab completion service. * * @author Marc Garcia <markcial@gmail.com> */ class AutoCompleter { /** @var Matcher\AbstractMatcher[] */ protected $matchers = []; private ?CompletionEngine $completionEngine = null; /** * Register a tab completion Matcher. * * @param AbstractMatcher $matcher */ public function addMatcher(AbstractMatcher $matcher) { $this->matchers[] = $matcher; if ($this->completionEngine !== null) { $this->completionEngine->addSource(new MatcherAdapterSource([$matcher])); } } /** * Use the canonical completion engine for readline callbacks. */ public function setCompletionEngine(CompletionEngine $completionEngine): void { $this->completionEngine = $completionEngine; if ($this->matchers !== []) { $this->completionEngine->addSource(new MatcherAdapterSource($this->matchers)); } } /** * Activate readline tab completion. */ public function activate() { \readline_completion_function([&$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(string $input, int $index, array $info = []): array { $line = $this->normalizeLineBuffer($input, $info); if ($this->completionEngine === null) { throw new \LogicException('AutoCompleter requires a CompletionEngine.'); } $matches = $this->completionEngine->getCompletions( new CompletionRequest($line, \mb_strlen($line), CompletionRequest::MODE_TAB, $info) ); return !empty($matches) ? $matches : ['']; } /** * The readline_completion_function callback handler. * * @see processCallback * * @param string $input * @param int $index * * @return array */ public function callback(string $input, int $index): array { return $this->processCallback($input, $index, \readline_info()); } private function normalizeLineBuffer(string $input, array $info): string { $line = $info['line_buffer'] ?? ''; if (isset($info['end'])) { $line = \substr($line, 0, $info['end']); } if ($line === '' && $input !== '') { $line = $input; } return $line; } /** * 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. if (\function_exists('readline_callback_handler_remove')) { \readline_callback_handler_remove(); } } }
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