A containment test expression.

Defined via Category.contains().


digit in (0..9 by 2)
user in authorizedUsers
input in { "yes", "no" }

The containment operation is special because the receiver of the method invocation by which it is defined is the right-hand side, not the left-hand side. In other words, lhs in rhs corresponds to


while e. g. lhs * rhs corresponds to


(the qualifier and argument swapped places).

no subtypes hierarchy

InOperation(ExistsNonemptyExpression element, ExistsNonemptyExpression category)
  • element

    The element that’s tested for being in category.

  • category

    The Category that is tested for containing element.

categorySource Codeshared ExistsNonemptyExpression category

The Category that is tested for containing element.

childrenSource Codeshared actual [ExistsNonemptyExpression, ExistsNonemptyExpression] children

The child nodes of this node.

Refines BinaryOperation.children ultimately refines Node.children
elementSource Codeshared ExistsNonemptyExpression element

The element that’s tested for being in category.

hashSource Codeshared actual Integer hash

The hash value of the value, which allows the value to be an element of a hash-based set or key of a hash-based map. Implementations must respect the constraint that:

  • if x==y then x.hash==y.hash.

Therefore, a class which refines equals must also refine hash.

Refines Object.hash
leftOperandSource Codeshared actual ExistsNonemptyExpression leftOperand

The element that’s tested for being in category.

See also element
operatorSource Codeshared actual String operator

The text of the operator.

rightOperandSource Codeshared actual ExistsNonemptyExpression rightOperand

The Category that is tested for containing element.

See also category
Inherited Attributes
Attributes inherited from: Node
Attributes inherited from: Object
copySource Codeshared InOperation copy(ExistsNonemptyExpression leftOperand = ..., ExistsNonemptyExpression rightOperand = ...)
  • leftOperand = this.leftOperand
  • rightOperand = this.rightOperand
equalsSource Codeshared actual Boolean equals(Object that)

Determine if two values are equal. Implementations should respect the constraints that:

  • if x===y then x==y (reflexivity),
  • if x==y then y==x (symmetry),
  • if x==y and y==z then x==z (transitivity).

Furthermore it is recommended that implementations ensure that if x==y then x and y have the same concrete class.

A class which explicitly refines equals() is said to support value equality, and the equality operator == is considered much more meaningful for such classes than for a class which simply inherits the default implementation of identity equality from Identifiable.

transformSource Codeshared actual Result transform<out Result>(Transformer<Result> transformer)

Transform this node with the given transformer by calling the appropriate transformX method on the transformer.

If you have a Node node that’s actually an LIdentifier instance, then the runtime will call LIdentifier.transform; therefore, this method is by nature narrowing. This means that if transformer is a NarrowingTransformer, calling node.transform(transformer) is equivalent to calling transformer.transformNode(node). On the other hand, if transformer is a WideningTransformer, then the two operations are very different.

Inherited Methods
Methods inherited from: Node