ilAssLacOrderingResultExpression.php

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<?php

class ilAssLacOrderingResultExpression extends ilAssLacAbstractExpression implements ilAssLacSolutionExpressionInterface
{
    public static $pattern = '/\$[0-9]+(?:,[0-9]+)*\$/';

    public static $identifier = '$n,m,o,p$';

    protected $ordering;

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

    protected function setMatches($matches): void
    {
        $this->ordering = array();

        foreach ($matches[0] as $match) {
            $this->ordering[] = $match;
        }
    }

    public function getOrdering(): array
    {
        return $this->ordering;
    }

    public function getValue(): string
    {
        return "$" . join(",", $this->ordering) . "$";
    }

    public function getDescription(): string
    {
        return join(",", $this->ordering) . " beantwortet ";
    }

    public function checkResult($result, $comperator, $index = null): bool
    {
        $keys = $result->getUserSolutionsByIdentifier("key");
        $keys = array_filter($keys, function ($element) {
            return $element != null;
        });

        switch ($comperator) {
            case "=":
                return $keys == $this->getOrdering();
                break;
            case "<>":
                return $keys != $this->getOrdering();
                break;
            default:
                return false;
        }
    }
}