Value Class

(QmlJS::Value)

The Value class is an abstract base class for the result of a JS expression. More...

Header: #include <Value>

Public Functions

Value()
virtual ~Value()
virtual void accept(ValueVisitor *) const = 0
virtual const AnchorLineValue *asAnchorLineValue() const
virtual const ASTFunctionValue *asAstFunctionValue() const
virtual const ASTObjectValue *asAstObjectValue() const
virtual const ASTPropertyReference *asAstPropertyReference() const
virtual const ASTSignal *asAstSignal() const
virtual const ASTVariableReference *asAstVariableReference() const
virtual const BooleanValue *asBooleanValue() const
virtual const ColorValue *asColorValue() const
virtual const CppComponentValue *asCppComponentValue() const
virtual const Function *asFunction() const
virtual const FunctionValue *asFunctionValue() const
virtual const IntValue *asIntValue() const
virtual const JSImportScope *asJSImportScope() const
virtual const MetaFunction *asMetaFunction() const
virtual const NullValue *asNullValue() const
virtual const NumberValue *asNumberValue() const
virtual const ObjectValue *asObjectValue() const
virtual const QmlEnumValue *asQmlEnumValue() const
virtual const QmlPrototypeReference *asQmlPrototypeReference() const
virtual const Internal::QtObjectPrototypeReference *asQtObjectPrototypeReference() const
virtual const RealValue *asRealValue() const
virtual const Reference *asReference() const
virtual const StringValue *asStringValue() const
virtual const TypeScope *asTypeScope() const
virtual const UndefinedValue *asUndefinedValue() const
virtual const UnknownValue *asUnknownValue() const
virtual const UrlValue *asUrlValue() const
virtual bool getSourceLocation(QString *fileName, int *line, int *column) const

Detailed Description

The Value class is an abstract base class for the result of a JS expression.

A Value represents a category of JavaScript values, such as number (NumberValue), string (StringValue) or functions with a specific signature (FunctionValue). It can also represent internal categories such as "a QML component instantiation defined in a file" (ASTObjectValue), "a QML component defined in C++" (CppComponentValue) or "no specific information is available" (UnknownValue).

The Value class itself provides accept() for admitting ValueVisitors and a do-nothing getSourceLocation().

Value instances should be cast to a derived type either through the asXXX() helper functions such as asNumberValue() or via the value_cast() template function.

Values are the result of many operations in the QmlJS code model:

See also Evaluate, ValueOwner, and ValueVisitor.

Member Function Documentation

Value::Value()

Default constructs an instance of Value.

[virtual] Value::~Value()

Destroys the instance of Value. The destructor is virtual.

[pure virtual] void Value::accept(ValueVisitor *) const

[virtual] const AnchorLineValue *Value::asAnchorLineValue() const

[virtual] const ASTFunctionValue *Value::asAstFunctionValue() const

[virtual] const ASTObjectValue *Value::asAstObjectValue() const

[virtual] const ASTPropertyReference *Value::asAstPropertyReference() const

[virtual] const ASTSignal *Value::asAstSignal() const

[virtual] const ASTVariableReference *Value::asAstVariableReference() const

[virtual] const BooleanValue *Value::asBooleanValue() const

[virtual] const ColorValue *Value::asColorValue() const

[virtual] const CppComponentValue *Value::asCppComponentValue() const

[virtual] const Function *Value::asFunction() const

[virtual] const FunctionValue *Value::asFunctionValue() const

[virtual] const IntValue *Value::asIntValue() const

[virtual] const JSImportScope *Value::asJSImportScope() const

[virtual] const MetaFunction *Value::asMetaFunction() const

[virtual] const NullValue *Value::asNullValue() const

[virtual] const NumberValue *Value::asNumberValue() const

[virtual] const ObjectValue *Value::asObjectValue() const

[virtual] const QmlEnumValue *Value::asQmlEnumValue() const

[virtual] const QmlPrototypeReference *Value::asQmlPrototypeReference() const

[virtual] const Internal::QtObjectPrototypeReference *Value::asQtObjectPrototypeReference() const

[virtual] const RealValue *Value::asRealValue() const

[virtual] const Reference *Value::asReference() const

[virtual] const StringValue *Value::asStringValue() const

[virtual] const TypeScope *Value::asTypeScope() const

[virtual] const UndefinedValue *Value::asUndefinedValue() const

[virtual] const UnknownValue *Value::asUnknownValue() const

[virtual] const UrlValue *Value::asUrlValue() const

[virtual] bool Value::getSourceLocation(QString *fileName, int *line, int *column) const