function MenuLinkDepthConstraintValidator::validate

Overrides RangeConstraintValidator::validate

File

core/lib/Drupal/Core/Menu/Plugin/Validation/Constraint/MenuLinkDepthConstraintValidator.php, line 27

Class

MenuLinkDepthConstraintValidator

Validates the MenuLinkDepthConstraint constraint.

Namespace

Code

public function validate(mixed $value, Constraint $constraint) : void {
    assert($constraint instanceof MenuLinkDepthConstraint);
    // The depth can never exceed the maximum depth of a menu tree.
    $constraint->max = $this->menuLinkTree
        ->maxDepth();
    $base_level = $constraint->baseLevel;
    // The base level might be a dynamic name that needs to be resolved.
    if (is_string($base_level)) {
        $base_level = TypeResolver::resolveDynamicTypeName($base_level, $this->context
            ->getObject());
    }
    if (!is_numeric($base_level)) {
        throw new RuntimeException('The `base` option must be a number, or an expression that resolves to one.');
    }
    // Clamp $base_level (which is zero-based) to at least 0 and no more than
    // the maximum depth of a menu tree.
    $base_level = max(0, $base_level);
    $base_level = min($base_level, $constraint->max);
    $constraint->max -= $base_level;
    // We're validating a depth -- i.e., the number of levels in the menu tree
    // that should be visible. 0 effectively means "show only one level", but
    // it's not a valid value: we can't show 0 levels of the tree, after all (
    // the minimum number of levels we *could* show is 1). The discrepancy is
    // due to $base_level being zero-based, so adjust for that.
    if ($constraint->max === 0) {
        $constraint->max = 1;
    }
    parent::validate($value, $constraint);
}