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);
}