Package com.google.javascript.rhino.jstype

Class FunctionType

java.lang.Object
com.google.javascript.rhino.jstype.JSType
com.google.javascript.rhino.jstype.ObjectType
com.google.javascript.rhino.jstype.FunctionType
All Implemented Interfaces:
StaticScope<JSType>, Serializable
Direct Known Subclasses:
NoObjectType
public class FunctionType extends ObjectType
This derived type provides extended information about a function, including its return type and argument types.

Note: the parameters list is the LP node that is the parent of the actual NAME node containing the parsed argument list (annotated with JSDOC_TYPE_PROP's for the compile-time type of each argument.

See Also:

  • Method Details

    • isInstanceType

      public boolean isInstanceType()
      Description copied from class: JSType
      Whether this type is an Instance object of some constructor. Does not necessarily mean this is an InstanceObjectType.
      Overrides:
      isInstanceType in class JSType

    • isConstructor

      public boolean isConstructor()
      Description copied from class: JSType
      Whether this type is a FunctionType that is a constructor or a named type that points to such a type.
      Overrides:
      isConstructor in class JSType

    • isInterface

      public boolean isInterface()
      Description copied from class: JSType
      Whether this type is a FunctionType that is an interface or a named type that points to such a type.
      Overrides:
      isInterface in class JSType

    • isOrdinaryFunction

      public boolean isOrdinaryFunction()
      Description copied from class: JSType
      Whether this type is a FunctionType that is an ordinary function or a named type that points to such a type.
      Overrides:
      isOrdinaryFunction in class JSType

    • makesStructs

      public boolean makesStructs()
      When a class B inherits from A and A is annotated as a struct, then B automatically gets the annotation, even if B's constructor is not explicitly annotated.

    • makesDicts

      public boolean makesDicts()
      When a class B inherits from A and A is annotated as a dict, then B automatically gets the annotation, even if B's constructor is not explicitly annotated.

    • setStruct

      public void setStruct()

    • setDict

      public void setDict()

    • toMaybeFunctionType

      public FunctionType toMaybeFunctionType()
      Description copied from class: JSType
      Downcasts this to a FunctionType, or returns null if this is not a function. For the purposes of this function, we define a MaybeFunctionType as any type in the sub-lattice { x | LEAST_FUNCTION_TYPE invalid input: '<'= x invalid input: '<'= GREATEST_FUNCTION_TYPE } This definition excludes bottom types like NoType and NoObjectType. This definition is somewhat arbitrary and axiomatic, but this is the definition that makes the most sense for the most callers.
      Overrides:
      toMaybeFunctionType in class JSType

    • 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.
      Returns:
      true if this type might be callable.

    • hasImplementedInterfaces

      public boolean hasImplementedInterfaces()

    • getParameters

      public Iterable<Node> getParameters()

    • getParametersNode

      public Node getParametersNode()
      Gets an LP node that contains all params. May be null.

    • getMinArguments

      public int getMinArguments()
      Gets the minimum number of arguments that this function requires.

    • getMaxArguments

      public int getMaxArguments()
      Gets the maximum number of arguments that this function requires, or Integer.MAX_VALUE if this is a variable argument function.

    • getReturnType

      public JSType getReturnType()

    • isReturnTypeInferred

      public boolean isReturnTypeInferred()

    • getSlot

      public Property getSlot(String name)
      Description copied from class: ObjectType
      Default getSlot implementation. This gets overridden by FunctionType for lazily-resolved prototypes.
      Specified by:
      getSlot in interface StaticScope<JSType>
      Overrides:
      getSlot in class ObjectType
      Parameters:
      name - The name of the variable slot to look up.
      Returns:
      The defined slot for the variable, or null if no definition exists.

    • getOwnPropertyNames

      public Set<String> getOwnPropertyNames()
      Includes the prototype iff someone has created it. We do not want to expose the prototype for ordinary functions.
      Overrides:
      getOwnPropertyNames in class ObjectType

    • getPrototype

      public ObjectType getPrototype()
      Gets the prototype property of this function type. This is equivalent to (ObjectType) getPropertyType("prototype").

    • setPrototypeBasedOn

      public void setPrototypeBasedOn(ObjectType baseType)
      Sets the prototype, creating the prototype object from the given base type.
      Parameters:
      baseType - The base type.

    • getAllImplementedInterfaces

      public Iterable<ObjectType> getAllImplementedInterfaces()
      Returns all interfaces implemented by a class or its superclass and any superclasses for any of those interfaces. If this is called before all types are resolved, it may return an incomplete set.

    • getImplementedInterfaces

      public Iterable<ObjectType> getImplementedInterfaces()
      Returns interfaces implemented directly by a class or its superclass.

    • getOwnImplementedInterfaces

      public Iterable<ObjectType> getOwnImplementedInterfaces()
      Returns interfaces directly implemented by the class.

    • setImplementedInterfaces

      public void setImplementedInterfaces(List<ObjectType> implementedInterfaces)

    • getAllExtendedInterfaces

      public Iterable<ObjectType> getAllExtendedInterfaces()
      Returns all extended interfaces declared by an interfaces or its super- interfaces. If this is called before all types are resolved, it may return an incomplete set.

    • getExtendedInterfaces

      public Iterable<ObjectType> getExtendedInterfaces()
      Returns interfaces directly extended by an interface

    • getExtendedInterfacesCount

      public int getExtendedInterfacesCount()
      Returns the number of interfaces directly extended by an interface

    • setExtendedInterfaces

      public void setExtendedInterfaces(List<ObjectType> extendedInterfaces) throws UnsupportedOperationException
      Throws:
      UnsupportedOperationException

    • getPropertyType

      public JSType getPropertyType(String name)
      Description copied from class: ObjectType
      Gets the property type of the property whose name is given. If the underlying object does not have this property, the Unknown type is returned to indicate that no information is available on this property. This gets overridden by FunctionType for lazily-resolved call() and bind() functions.
      Overrides:
      getPropertyType in class ObjectType
      Returns:
      the property's type or UnknownType. This method never returns null.

    • getBindReturnType

      public FunctionType getBindReturnType(int argsToBind)
      Get the return value of calling "bind" on this function with the specified number of arguments. If -1 is passed, then we will return a result that accepts any parameters.

    • getSuperClassConstructor

      public FunctionType getSuperClassConstructor()
      Given a constructor or an interface type, get its superclass constructor or null if none exists.

    • getTopDefiningInterface

      public static ObjectType getTopDefiningInterface(ObjectType type, String propertyName)
      Given an interface and a property, finds the top-most super interface that has the property defined (including this interface).

    • getTopMostDefiningType

      public ObjectType getTopMostDefiningType(String propertyName)
      Given a constructor or an interface type and a property, finds the top-most superclass that has the property defined (including this constructor).

    • hashCode

      public int hashCode()
      Overrides:
      hashCode in class JSType

    • hasEqualCallType

      public boolean hasEqualCallType(FunctionType otherType)

    • isSubtype

      public boolean isSubtype(JSType that)
      A function is a subtype of another if their call methods are related via subtyping and this is a subtype of that with regard to the prototype chain.
      Returns:
      this &lt;: that

    • 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:

    • getInstanceType

      public ObjectType getInstanceType()
      Gets the type of instance of this function.
      Throws:
      IllegalStateException - if this function is not a constructor (see isConstructor()).

    • hasInstanceType

      public boolean hasInstanceType()
      Returns whether this function type has an instance type.

    • getTypeOfThis

      public JSType getTypeOfThis()
      Gets the type of this in this function.
      Specified by:
      getTypeOfThis in interface StaticScope<JSType>
      Overrides:
      getTypeOfThis in class ObjectType

    • getSource

      public Node getSource()
      Gets the source node or null if this is an unknown function.

    • setSource

      public void setSource(Node source)
      Sets the source node.

    • clearCachedValues

      public void clearCachedValues()
      Description copied from class: ObjectType
      Clear cached values. Should be called before making changes to a prototype that may have been changed since creation.
      Overrides:
      clearCachedValues in class ObjectType

    • getSubTypes

      public List<FunctionType> getSubTypes()
      Returns a list of types that are subtypes of this type. This is only valid for constructor functions, and may be null. This allows a downward traversal of the subtype graph.

    • 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.

    • toDebugHashCodeString

      public String toDebugHashCodeString()
      Description copied from class: JSType
      A hash code function for diagnosing complicated issues around type-identity.
      Overrides:
      toDebugHashCodeString in class JSType

    • cloneWithoutArrowType

      public FunctionType cloneWithoutArrowType()
      Create a new constructor with the parameters and return type stripped.

    • hasAnyTemplateTypesInternal

      public boolean hasAnyTemplateTypesInternal()

    • 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
      Parameters:
      info - JSDocInfo for the property definition. May be null.

    • 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.
      Overrides:
      matchesNumberContext in class JSType

    • 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.
      Overrides:
      matchesStringContext in class JSType

    • 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.

    • 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.
      Overrides:
      matchesObjectContext in class JSType

    • getConstructor

      public FunctionType getConstructor()
      Description copied from class: ObjectType
      Gets this object's constructor.
      Specified by:
      getConstructor in class ObjectType
      Returns:
      this object's constructor or null if it is a native object (constructed natively v.s. by instantiation of a function)

    • getImplicitPrototype

      public ObjectType getImplicitPrototype()
      Description copied from class: ObjectType
      Gets the implicit prototype (a.k.a. the [[Prototype]] property).
      Specified by:
      getImplicitPrototype in class ObjectType

    • 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

    • 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
      Parameters:
      constraint -

    • matchRecordTypeConstraint

      public void matchRecordTypeConstraint(ObjectType constraintObj)