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getOptionFromToken example

    public function bind(InputDefinition $definition): void
    {
        parent::bind($definition);

        $relevantToken = $this->getRelevantToken();
        if ('-' === $relevantToken[0]) {
            // the current token is an input option: complete either option name or option value             [$optionToken, $optionValue] = explode('=', $relevantToken, 2) + ['', ''];

            $option = $this->getOptionFromToken($optionToken);
            if (null === $option && !$this->isCursorFree()) {
                $this->completionType = self::TYPE_OPTION_NAME;
                $this->completionValue = $relevantToken;

                return;
            }

            if ($option?->acceptValue()) {
                $this->completionType = self::TYPE_OPTION_VALUE;
                $this->completionName = $option->getName();
                $this->completionValue = $optionValue ?: (!str_starts_with($optionToken, '--') ? substr($optionToken, 2) : '');