ilAssLacEmptyAnswerExpression.php

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<?php

class ilAssLacEmptyAnswerExpression extends ilAssLacAbstractExpression implements ilAssLacSolutionExpressionInterface
{
    public static $pattern = '/(\?)/';

    public static $identifier = "?";

    protected $matched;

    protected function getPattern(): string
    {
        return '/(\?)/';
    }

    public function getValue(): string
    {
        return "?";
    }

    public function getDescription(): string
    {
        return " nicht beantwortet";
    }

    public function checkResult($result, $comperator, $index = null): bool
    {
        if ($index == null) {
            switch ($comperator) {
                case "=":
                    return !$result->hasSolutions();
                    break;
                case "<>":
                    return $result->hasSolutions();
                    break;
                default:
                    return false;
            }
        } else {
            $solution = $result->getSolutionForKey($index);
            switch ($comperator) {
                case "=":
                    return $solution == null;
                    break;
                case "<>":
                    return $solution != null;
                    break;
                default:
                    return false;
            }
        }
    }

    protected function setMatches($matches): void
    {
        $this->matched = true;
    }
}