PhpCsFixer\Console\ConfigurationResolver::parseRules PHP Method

    private function parseRules()
    {
        if (null === $this->options['rules']) {
            return $this->getConfig()->getRules();
        }
        $rules = array();
        foreach (array_map('trim', explode(',', $this->options['rules'])) as $rule) {
            if ('' === $rule) {
                throw new InvalidConfigurationException('Empty rule name is not allowed.');
            }
            if ('-' === $rule[0]) {
                $rules[substr($rule, 1)] = false;
            } else {
                $rules[$rule] = true;
            }
        }
        return $rules;
    }