Package com.google.javascript.rhino.jstype

Class NoType

  • All Implemented Interfaces:
    java.io.Serializable
    Direct Known Subclasses:
    NoResolvedType
    public class NoType
extends NoObjectType
    Bottom type, representing the subclass of any value or object. Although JavaScript programmers can't explicitly denote the bottom type, it comes up in static analysis. For example, if we have: var x = null; if (x) { f(x); } We need to be able to assign x a type within the f(x) call. Since it has no possible type, we assign x the NoType, so that f(x) is legal no matter what the type of f's first argument is.
    See Also:
    Bottom types, Serialized Form

    • Method Detail

      • isNoType

        public boolean isNoType()
        Overrides:
        isNoType in class JSType

      • isNullable

        public final boolean isNullable()
        Description copied from class: JSType
        Tests whether this type is nullable.
        Overrides:
        isNullable in class JSType

      • isVoidable

        public final boolean isVoidable()
        Description copied from class: JSType
        Tests whether this type is voidable.
        Overrides:
        isVoidable in class JSType

      • getPossibleToBooleanOutcomes

        public final BooleanLiteralSet getPossibleToBooleanOutcomes()
        Description copied from class: JSType
        Computes the set of possible outcomes of the ToBoolean predicate for this type. The ToBoolean predicate is defined by the ECMA-262 standard, 3rd edition. Its behavior for simple types can be summarized by the following table:
        ToBoolean results by input type
        typeresult
        undefined{false}
        null{false}
        boolean{true, false}
        number{true, false}
        string{true, false}
        Object{true}
        Overrides:
        getPossibleToBooleanOutcomes in class ObjectType
        Returns:
        the set of boolean literals for this type

      • visit

        public final <T> T visit​(Visitor<T> visitor)
        Description copied from class: JSType
        Visit this type with the given visitor.
        Overrides:
        visit in class NoObjectType
        Returns:
        the value returned by the visitor
        See Also:
        Visitor