`TCustomExpressionParser`
pt		MakeRec
pt		FillExpressList
pt		HandleUnknownVariable
pt		CompileExpression
pt		EvaluateCurrent
pt		DisposeList
pt		DisposeTree
pt		CurrentExpression
pt		GetResultType
		Create
		Destroy
		DefineFloatVariable
		DefineIntegerVariable
		DefineDateTimeVariable
		DefineBooleanVariable
		DefineStringVariable
		DefineFunction
		Evaluate
		AddExpression
		ClearExpressions
		GetFunctionNames
		GetFunctionDescription