trait RequireEventTrait

trait RequireEventTrait {
    
    /**
     * The runtime packages, in the form 'vendor/name:constraint'.
     *
     * @var string[]
     */
    private $runtimePackages;
    
    /**
     * The dev packages to be required, in the form 'vendor/name:constraint'.
     *
     * @var string[]
     */
    private $devPackages;
    
    /**
     * Constructs the object.
     *
     * @param \Drupal\package_manager\StageBase $stage
     *   The stage.
     * @param string[] $runtime_packages
     *   The runtime (i.e., non-dev) packages to be required, in the form
     *   'vendor/name:constraint'.
     * @param string[] $dev_packages
     *   The dev packages to be required, in the form 'vendor/name:constraint'.
     */
    public function __construct(StageBase $stage, array $runtime_packages, array $dev_packages = []) {
        $this->runtimePackages = $runtime_packages;
        $this->devPackages = $dev_packages;
        parent::__construct($stage);
    }
    
    /**
     * Gets the runtime (i.e., non-dev) packages.
     *
     * @return string[]
     *   An array of packages where the keys are package names in the form
     *   `vendor/name` and the values are version constraints. Packages without a
     *   version constraint will default to `*`.
     */
    public function getRuntimePackages() : array {
        return $this->getKeyedPackages($this->runtimePackages);
    }
    
    /**
     * Gets the dev packages.
     *
     * @return string[]
     *   An array of packages where the values are version constraints and keys
     *   are package names in the form `vendor/name`. Packages without a version
     *   constraint will default to `*`.
     */
    public function getDevPackages() : array {
        return $this->getKeyedPackages($this->devPackages);
    }
    
    /**
     * Gets packages as a keyed array.
     *
     * @param string[] $packages
     *   The packages, in the form 'vendor/name:version'.
     *
     * @return string[]
     *   An array of packages where the values are version constraints and keys
     *   are package names in the form `vendor/name`. Packages without a version
     *   constraint will default to `*`.
     */
    private function getKeyedPackages(array $packages) : array {
        $keyed_packages = [];
        foreach ($packages as $package) {
            if (strpos($package, ':') > 0) {
                [
                    $name,
                    $constraint,
                ] = explode(':', $package);
            }
            else {
                [
                    $name,
                    $constraint,
                ] = [
                    $package,
                    '*',
                ];
            }
            $keyed_packages[$name] = $constraint;
        }
        return $keyed_packages;
    }

}