class ScaffoldFileInfo

class ScaffoldFileInfo {
    
    /**
     * The path to the destination.
     *
     * @var \Drupal\Composer\Plugin\Scaffold\ScaffoldFilePath
     */
    protected $destination;
    
    /**
     * The operation used to create the destination.
     *
     * @var \Drupal\Composer\Plugin\Scaffold\Operations\OperationInterface
     */
    protected $op;
    
    /**
     * Constructs a ScaffoldFileInfo object.
     *
     * @param \Drupal\Composer\Plugin\Scaffold\ScaffoldFilePath $destination
     *   The full and relative paths to the destination file and the package
     *   defining it.
     * @param \Drupal\Composer\Plugin\Scaffold\Operations\OperationInterface $op
     *   Operations object that will handle scaffolding operations.
     */
    public function __construct(ScaffoldFilePath $destination, OperationInterface $op) {
        $this->destination = $destination;
        $this->op = $op;
    }
    
    /**
     * Gets the Scaffold operation.
     *
     * @return \Drupal\Composer\Plugin\Scaffold\Operations\OperationInterface
     *   Operations object that handles scaffolding (copy, make symlink, etc).
     */
    public function op() {
        return $this->op;
    }
    
    /**
     * Gets the package name.
     *
     * @return string
     *   The name of the package this scaffold file info was collected from.
     */
    public function packageName() {
        return $this->destination
            ->packageName();
    }
    
    /**
     * Gets the destination.
     *
     * @return \Drupal\Composer\Plugin\Scaffold\ScaffoldFilePath
     *   The scaffold path to the destination file.
     */
    public function destination() {
        return $this->destination;
    }
    
    /**
     * Determines if this scaffold file has been overridden by another package.
     *
     * @param string $providing_package
     *   The name of the package that provides the scaffold file at this location,
     *   as returned by self::findProvidingPackage()
     *
     * @return bool
     *   Whether this scaffold file if overridden or removed.
     */
    public function overridden($providing_package) {
        return $this->packageName() !== $providing_package;
    }
    
    /**
     * Replaces placeholders in a message.
     *
     * @param string $message
     *   Message with placeholders to fill in.
     * @param array $extra
     *   Additional data to merge with the interpolator.
     * @param mixed $default
     *   Default value to use for missing placeholders, or FALSE to keep them.
     *
     * @return string
     *   Interpolated string with placeholders replaced.
     */
    public function interpolate($message, array $extra = [], $default = FALSE) {
        $interpolator = $this->destination
            ->getInterpolator();
        return $interpolator->interpolate($message, $extra, $default);
    }
    
    /**
     * Moves a single scaffold file from source to destination.
     *
     * @param \Composer\IO\IOInterface $io
     *   The scaffold file to be processed.
     * @param \Drupal\Composer\Plugin\Scaffold\ScaffoldOptions $options
     *   Assorted operational options, e.g. whether the destination should be a
     *   symlink.
     *
     * @return \Drupal\Composer\Plugin\Scaffold\Operations\ScaffoldResult
     *   The scaffold result.
     */
    public function process(IOInterface $io, ScaffoldOptions $options) {
        return $this->op()
            ->process($this->destination, $io, $options);
    }
    
    /**
     * Returns TRUE if the target does not exist or has changed.
     *
     * @return bool
     */
    public final function hasChanged() {
        $path = $this->destination()
            ->fullPath();
        if (!file_exists($path)) {
            return TRUE;
        }
        return $this->op()
            ->contents() !== file_get_contents($path);
    }

}