TFPExprIdentifierDef class

In unit fpExprPars

Class for defining identifiers in expressions

Declaration

pascal

TFPExprIdentifierDef = class(TCollectionItem)

Inheritance

TFPExprIdentifierDef
TCollectionItem
TPersistent
TObject

Descends from it: TFPBuiltInExprIdentifierDef

Description

The TFPExprIdentifierDef class defines an identifier (variable or function) that can be used in expressions. It holds the name, type, and implementation details for identifiers, allowing the expression parser to resolve and evaluate them during expression processing.

Properties

`AsFloat`	public	Get identifier value as float
`AsCurrency`	public	Get identifier value as currency
`AsInteger`	public	Get identifier value as integer
`AsString`	public	Get identifier value as string
`AsBoolean`	public	Get identifier value as boolean
`AsDateTime`	public	Get identifier value as datetime
`IdentifierType`	published	The type of this identifier
`Name`	published	The name of the identifier
`Value`	published	The value of the identifier
`ParameterTypes`	published	The parameter types for function identifiers
`ResultType`	published	The result type of the identifier
`NodeType`	published	The node type for this identifier
`VariableArgumentCount`	published

Methods

`CheckResultType`	protected
`CheckVariable`	protected
`FetchValue`	protected
`ArgumentCount`	public	Get the number of arguments for function identifier
`Assign`	public	Assign values from another identifier definition
`EventBasedVariable`	public	Check if identifier is an event-based variable

Events

`OnGetFunctionValueCallBack`	public	Callback property for function value evaluation
`OnGetVariableValueCallBack`	public	Callback property for variable value evaluation
`OnGetFunctionValue`	published	Event for function value evaluation
`OnGetVariableValue`	published	Event for variable value evaluation

Inherited

From TCollectionItem (13)

Changed Collection Create Destroy DisplayName GetDisplayName GetNamePath GetOwner ID Index SetCollection SetDisplayName SetIndex

From TPersistent (5)

AssignTo DefineProperties FPOAttachObserver FPODetachObserver FPONotifyObservers

From TObject (40)

AfterConstruction BeforeDestruction CheckDisposed ClassInfo ClassName ClassNameIs ClassParent ClassType CleanupInstance DefaultHandler DefaultHandlerStr Dispatch DispatchStr Disposed DisposeOf Equals FieldAddress Free FreeInstance GetDisposed GetHashCode GetInterface GetInterfaceByStr GetInterfaceEntry GetInterfaceEntryByStr GetInterfaceTable GetInterfaceWeak GetLastCastErrorInfo InheritsFrom InitInstance InstanceSize MethodAddress MethodName newinstance QualifiedClassName SafeCallException StringMessageTable SystemHasExtendedRTTI ToString UnitName

An experiment, built from development snapshots. Not the official Free Pascal or Lazarus documentation.