com.google.javascript.rhino.jstype
Class EnumType

java.lang.Object
  com.google.javascript.rhino.jstype.JSType
      com.google.javascript.rhino.jstype.ObjectType
          com.google.javascript.rhino.jstype.EnumType

All Implemented Interfaces:

StaticScope<JSType>, Serializable

public class EnumType
extends ObjectType

An enum type representing a branded collection of elements. Each element is referenced by its name, and has an EnumElementType type.

See Also:

Serialized Form

getSource

public Node getSource()

Gets the source node or null if this is an unknown enum.

toMaybeEnumType

public EnumType toMaybeEnumType()

Description copied from class: JSType

Downcasts this to an EnumType, or returns null if this is not an EnumType.

Overrides:

toMaybeEnumType in class JSType

getImplicitPrototype

public ObjectType getImplicitPrototype()

Description copied from class: ObjectType

Gets the implicit prototype (a.k.a. the [[Prototype]] property).

getElements

public Set<String> getElements()

Gets the elements defined on this enum.

Returns:

the elements' names defined on this enum. The returned set is immutable.

defineElement

public boolean defineElement(String name,
                             Node definingNode)

Defines a new element on this enum.

Parameters:

name - the name of the new element

definingNode - the Node that defines this new element

Returns:

true iff the new element is added successfully

getElementsType

public EnumElementType getElementsType()

Gets the elements' type.

testForEquality

public TernaryValue testForEquality(JSType that)

Description copied from class: JSType

Compares this and that.

Overrides:

testForEquality in class ObjectType

Returns:

• TernaryValue.TRUE if the comparison of values of this type and that always succeed (such as undefined compared to null)
• TernaryValue.FALSE if the comparison of values of this type and that always fails (such as undefined compared to number)
• TernaryValue.UNKNOWN if the comparison can succeed or fail depending on the concrete values

isSubtype

public boolean isSubtype(JSType that)

Description copied from class: JSType

Checks whether this is a subtype of that.

Subtyping rules:

• (unknown) — every type is a subtype of the Unknown type.
• (no) — the No type is a subtype of every type.
• (no-object) — the NoObject type is a subtype of every object type (i.e. subtypes of the Object type).
• (ref) — a type is a subtype of itself.
• (union-l) — A union type is a subtype of a type U if all the union type's constituents are a subtype of U. Formally
  (T<sub>1</sub>, &hellip;, T<sub>n</sub>) &lt;: U if and only T<sub>k</sub> &lt;: U for all k ∈ 1..n.
• (union-r) — A type U is a subtype of a union type if it is a subtype of one of the union type's constituents. Formally
  U &lt;: (T<sub>1</sub>, &hellip;, T<sub>n</sub>) if and only if U &lt;: T<sub>k</sub> for some index k.
• (objects) — an Object O<sub>1</sub> is a subtype of an object O<sub>2</sub> if it has more properties than O<sub>2</sub> and all common properties are pairwise subtypes.

Returns:

this <: that

getDisplayName

public String getDisplayName()

Description copied from class: JSType

Returns a user meaningful label for the JSType instance. For example, Functions and Enums will return their declaration name (if they have one). Some types will not have a meaningful display name. Calls to hasDisplayName() will return true IFF getDisplayName() will return null or a zero length string.

Overrides:

getDisplayName in class ObjectType

Returns:

the display name of the type, or null if one is not available

visit

public <T> T visit(Visitor<T> visitor)

Description copied from class: JSType

Visit this type with the given visitor.

Overrides:

visit in class ObjectType

Returns:

the value returned by the visitor

See Also:

Visitor

getConstructor

public FunctionType getConstructor()

Description copied from class: ObjectType

Gets this object's constructor.

Returns:

this object's constructor or null if it is a native object (constructed natively v.s. by instantiation of a function)

matchesNumberContext

public boolean matchesNumberContext()

Description copied from class: JSType

This predicate is used to test whether a given type can appear in a numeric context, such as an operand of a multiply operator.

matchesStringContext

public boolean matchesStringContext()

Description copied from class: JSType

This predicate is used to test whether a given type can appear in a String context, such as an operand of a string concat (+) operator. All types have at least the potential for converting to String. When we add externally defined types, such as a browser OM, we may choose to add types that do not automatically convert to String.

matchesObjectContext

public boolean matchesObjectContext()

Description copied from class: JSType

This predicate is used to test whether a given type can appear in an Object context, such as the expression in a with statement. Most types we will encounter, except notably null, have at least the potential for converting to Object. Host defined objects can get peculiar.

removeProperty

public boolean removeProperty(String name)

Description copied from class: ObjectType

Removes the declared or inferred property from this ObjectType.

Overrides:

removeProperty in class ObjectType

Parameters:

name - the property's name

Returns:

true if the property was removed successfully. False if the property did not exist, or could not be removed.

setPropertyJSDocInfo

public void setPropertyJSDocInfo(String propertyName,
                                 JSDocInfo info)

Description copied from class: ObjectType

Sets the docInfo for the specified property from the JSDocInfo on its definition.

Overrides:

setPropertyJSDocInfo in class ObjectType

info - JSDocInfo for the property definition. May be null.

unboxesTo

public JSType unboxesTo()

Description copied from class: JSType

Turn an object type to its corresponding scalar type.

Overrides:

unboxesTo in class JSType

Returns:

the unboxed type or null if this type does not unbox.

canBeCalled

public boolean canBeCalled()

Description copied from class: JSType

This predicate is used to test whether a given type can be used as the 'function' in a function call.

Overrides:

canBeCalled in class JSType

Returns:

true if this type might be callable.

getReferenceName

public String getReferenceName()

Description copied from class: ObjectType

Gets the reference name for this object. This includes named types like constructors, prototypes, and enums. It notably does not include literal types like strings and booleans and structural types.

Specified by:

getReferenceName in class ObjectType

Returns:

the object's name or null if this is an anonymous object

hasReferenceName

public boolean hasReferenceName()

Description copied from class: ObjectType

Returns true if the object is named.

Overrides:

hasReferenceName in class ObjectType

Returns:

true if the object is named, false if it is anonymous

hasCachedValues

public boolean hasCachedValues()

Description copied from class: ObjectType

Returns true if any cached values have been set for this type. If true, then the prototype chain should not be changed, as it might invalidate the cached values.

Overrides:

hasCachedValues in class ObjectType

isNativeObjectType

public boolean isNativeObjectType()

Whether this is a built-in object.

Overrides:

isNativeObjectType in class ObjectType

getOwnerFunction

public FunctionType getOwnerFunction()

Description copied from class: ObjectType

Gets the owner of this if it's a function prototype.

Overrides:

getOwnerFunction in class ObjectType

getCtorImplementedInterfaces

public Iterable<ObjectType> getCtorImplementedInterfaces()

Description copied from class: ObjectType

Gets the interfaces implemented by the ctor associated with this type. Intended to be overridden by subclasses.

Overrides:

getCtorImplementedInterfaces in class ObjectType

getCtorExtendedInterfaces

public Iterable<ObjectType> getCtorExtendedInterfaces()

Description copied from class: ObjectType

Gets the interfaces extended by the interface associated with this type. Intended to be overridden by subclasses.

Overrides:

getCtorExtendedInterfaces in class ObjectType

matchConstraint

public void matchConstraint(JSType constraint)

Description copied from class: JSType

Modify this type so that it matches the specified type. This is useful for reverse type-inference, where we want to infer that an object literal matches its constraint (much like how the java compiler does reverse-inference to figure out generics).

Overrides:

matchConstraint in class JSType

matchRecordTypeConstraint

public void matchRecordTypeConstraint(ObjectType constraintObj)