class BootstrapErrorHandler

final class BootstrapErrorHandler {
    
    /**
     * @param \PHPUnit\Runner\ErrorHandler $phpUnitErrorHandler
     *   An instance of PHPUnit's runner own error handler. Any error not
     *   managed here will fall back to it.
     */
    public function __construct(PhpUnitErrorHandler $phpUnitErrorHandler) {
    }
    
    /**
     * Executes when the object is called as a function.
     *
     * @param int $errorNumber
     *   The level of the error raised.
     * @param string $errorString
     *   The error message.
     * @param string $errorFile
     *   The filename that the error was raised in.
     * @param int $errorLine
     *   The line number the error was raised at.
     *
     * @return bool
     *   TRUE to stop error handling, FALSE to let the normal error handler
     *   continue.
     */
    public function __invoke(int $errorNumber, string $errorString, string $errorFile, int $errorLine) : bool {
        if (!DeprecationHandler::isEnabled()) {
            throw new \RuntimeException(__METHOD__ . '() must not be called if the deprecation handler is not enabled.');
        }
        // We collect a deprecation no matter what.
        if (E_USER_DEPRECATED === $errorNumber || E_DEPRECATED === $errorNumber) {
            $prefix = error_reporting() & $errorNumber ? 'Unsilenced deprecation: ' : '';
            DeprecationHandler::collectActualDeprecation($prefix . $errorString);
        }
        // If the deprecation handled is one of those in the ignore list, we keep
        // running.
        if ((E_USER_DEPRECATED === $errorNumber || E_DEPRECATED === $errorNumber) && DeprecationHandler::isIgnoredDeprecation($errorString)) {
            return TRUE;
        }
        // In all other cases (errors, warnings, deprecations to be reported), we
        // fall back to PHPUnit's error handler, an instance of which was created
        // when this error handler was created.
        try {
            call_user_func($this->phpUnitErrorHandler, $errorNumber, $errorString, $errorFile, $errorLine);
        } catch (NoTestCaseObjectOnCallStackException $e) {
            // If we end up here, it's likely because a test's processing has
            // finished already and we are processing an error that occurred while
            // dealing with STDOUT rewinding or truncating. Do nothing.
        }
        return TRUE;
    }

}