com.google.javascript.rhino.jstype

Class NoObjectType

java.lang.Object

com.google.javascript.rhino.jstype.JSType

com.google.javascript.rhino.jstype.ObjectType

com.google.javascript.rhino.jstype.PrototypeObjectType

com.google.javascript.rhino.jstype.FunctionType

com.google.javascript.rhino.jstype.NoObjectType

All Implemented Interfaces:

StaticScope<JSType>, Serializable

Direct Known Subclasses:

NoType

public class NoObjectType
extends FunctionType

The bottom Object type, representing the subclass of all objects. Although JavaScript programmers can't explicitly denote the bottom Object type, it comes up in static analysis. For example, if we have: var x = function() {}; if (x instanceof Array) { f(x); } We need to be able to assign x a type within the f(x) call. It has no possible type, but x would not be legal if f expected a string. So we assign it the NoObjectType.

See Also:

Bottom types, Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class com.google.javascript.rhino.jstype.JSType

JSType.TypePair

Field Summary

Fields inherited from class com.google.javascript.rhino.jstype.JSType

EMPTY_TYPE_COMPONENT, ENUMDECL, NOT_A_CLASS, NOT_A_TYPE, NOT_ENUMDECL, templateTypeMap, UNKNOWN_NAME

Method Summary

Methods

Modifier and Type	Method and Description
FunctionType	getConstructor() Gets this object's constructor.
ObjectType	getImplicitPrototype() Gets the implicit prototype (a.k.a.
String	getReferenceName() Gets the reference name for this object.
int	hashCode()
boolean	isNoObjectType()
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.
boolean	matchesNumberContext() This predicate is used to test whether a given type can appear in a numeric context, such as an operand of a multiply operator.
boolean	matchesObjectContext() This predicate is used to test whether a given type can appear in an Object context, such as the expression in a with statement.
boolean	matchesStringContext() 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.
boolean	removeProperty(String name) Removes the declared or inferred property from this ObjectType.
void	setPropertyJSDocInfo(String propertyName, JSDocInfo info) Sets the docInfo for the specified property from the JSDocInfo on its definition.
FunctionType	toMaybeFunctionType() Downcasts this to a FunctionType, or returns null if this is not a function.
<T> T	visit(Visitor<T> visitor) Visit this type with the given visitor.

Methods inherited from class com.google.javascript.rhino.jstype.FunctionType

canBeCalled, clearCachedValues, cloneWithoutArrowType, extendTemplateTypeMapBasedOn, getAllExtendedInterfaces, getAllImplementedInterfaces, getBindReturnType, getExtendedInterfaces, getExtendedInterfacesCount, getImplementedInterfaces, getInstanceType, getMaxArguments, getMinArguments, getOwnImplementedInterfaces, getOwnPropertyNames, getParameters, getParametersNode, getPropertyType, getPrototype, getReturnType, getSlot, getSource, getSubTypes, getSuperClassConstructor, getTopDefiningInterface, getTopMostDefiningType, getTypeOfThis, hasAnyTemplateTypesInternal, hasCachedValues, hasEqualCallType, hasImplementedInterfaces, hasInstanceType, isConstructor, isInstanceType, isInterface, isOrdinaryFunction, isReturnTypeInferred, makesDicts, makesStructs, setDict, setExtendedInterfaces, setImplementedInterfaces, setPrototypeBasedOn, setSource, setStruct, toDebugHashCodeString

Methods inherited from class com.google.javascript.rhino.jstype.PrototypeObjectType

getCtorExtendedInterfaces, getCtorImplementedInterfaces, getOwnerFunction, hasReferenceName, isAnonymous, isNativeObjectType, matchConstraint, matchRecordTypeConstraint, unboxesTo

Methods inherited from class com.google.javascript.rhino.jstype.ObjectType

cast, createDelegateSuffix, defineDeclaredProperty, defineInferredProperty, defineSynthesizedProperty, findPropertyType, getDisplayName, getJSDocInfo, getNormalizedReferenceName, getOwnPropertyJSDocInfo, getOwnSlot, getParentScope, getPossibleToBooleanOutcomes, getPropertiesCount, getPropertyNames, getPropertyNode, getRootNode, getTemplateTypes, hasOwnProperty, hasProperty, isFunctionPrototypeType, isObject, isPropertyInExterns, isPropertyTypeDeclared, isPropertyTypeInferred, isUnknownType, setJSDocInfo, testForEquality

Methods inherited from class com.google.javascript.rhino.jstype.JSType

autobox, autoboxesTo, canCastTo, canTestForEqualityWith, canTestForShallowEqualityWith, clearResolved, collapseUnion, dereference, differsFrom, equals, extendTemplateTypeMap, getGreatestSubtype, getLeastSupertype, getRestrictedTypeGivenToBooleanOutcome, getTemplateTypeMap, getTypesUnderEquality, getTypesUnderInequality, getTypesUnderShallowEquality, getTypesUnderShallowInequality, hasAnyTemplateTypes, hasDisplayName, isAllType, isArrayType, isBooleanObjectType, isBooleanValueType, isCheckedUnknownType, isDateType, isDict, isEmptyType, isEnumElementType, isEnumType, isEquivalent, isEquivalentTo, isFunctionType, isGlobalThisType, isInvariant, isNominalConstructor, isNominalType, isNoResolvedType, isNoType, isNullable, isNullType, isNumber, isNumberObjectType, isNumberValueType, isRecordType, isRegexpType, isResolved, isString, isStringObjectType, isStringValueType, isStruct, isTemplateType, isTemplatizedType, isUnionType, isVoidType, matchesInt32Context, matchesUint32Context, resolve, restrictByNotNullOrUndefined, setValidator, toAnnotationString, toMaybeEnumElementType, toMaybeEnumType, toMaybeFunctionType, toMaybeRecordType, toMaybeTemplateType, toMaybeTemplateType, toMaybeTemplatizedType, toMaybeTemplatizedType, toMaybeUnionType, toObjectType, toString

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Method Detail

isSubtype

public boolean isSubtype(JSType that)

Description copied from class: FunctionType

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.

Overrides:

isSubtype in class FunctionType

Returns:

this <: that

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 <= x <= 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 FunctionType

isNoObjectType

public boolean isNoObjectType()

Overrides:

isNoObjectType in class JSType

getImplicitPrototype

public ObjectType getImplicitPrototype()

Description copied from class: ObjectType

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

Overrides:

getImplicitPrototype in class PrototypeObjectType

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.

Overrides:

getReferenceName in class PrototypeObjectType

Returns:

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

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 PrototypeObjectType

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 PrototypeObjectType

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 PrototypeObjectType

hashCode

public int hashCode()

Overrides:

hashCode in class FunctionType

removeProperty

public boolean removeProperty(String name)

Description copied from class: ObjectType

Removes the declared or inferred property from this ObjectType.

Overrides:

removeProperty in class PrototypeObjectType

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 PrototypeObjectType

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

visit

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

Description copied from class: JSType

Visit this type with the given visitor.

Overrides:

visit in class FunctionType

Returns:

the value returned by the visitor

See Also:

Visitor

getConstructor

public FunctionType getConstructor()

Description copied from class: ObjectType

Gets this object's constructor.

Overrides:

getConstructor in class PrototypeObjectType

Returns:

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