ilAssLacNumberOfResultExpression.php

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<?php

class ilAssLacNumberOfResultExpression extends ilAssLacAbstractExpression implements ilAssLacSolutionExpressionInterface
{
    public static $pattern = "/\\+[0-9]+\\+/";

    public static $identifier = "+n+";

    protected $numeric_value;

    protected function setMatches($matches): void
    {
        $this->numeric_value = $matches[0][0];
    }

    public function getNumericValue(): int
    {
        return $this->numeric_value;
    }

    public function getValue(): string
    {
        return '+' . $this->numeric_value . "+";
    }

    public function getDescription(): string
    {
        return "Anwort " . $this->numeric_value . " beantwortet ";
    }

    public function checkResult($result, $comperator, $index = null): bool
    {
        $isTrue = false;
        if ($index == null) {
            $values = $result->getUserSolutionsByIdentifier("key");

            foreach ($values as $value) {
                $isTrue = $isTrue || $this->compare($comperator, $value);
            }
        } else {
            $solution = $result->getSolutionForKey($index);
            $isTrue = $this->compare($comperator, $solution["value"] ?? "");
        }

        return $isTrue;
    }

    private function compare($comperator, $value): bool
    {
        switch ($comperator) {
            case "=":
                return $value == $this->getNumericValue();
                break;
            case "<>":
                return $value != $this->getNumericValue();
                break;
            default:
                return false;
        }
    }
}