Method getFunctionObject

visitor.go:969–996

获取函数的 object 对象，需要用来压栈

(ctx *parser.FunctionCallContext)

// 获取函数的 object 对象，需要用来压栈
func (v *Visitor) getFunctionObject(ctx *parser.FunctionCallContext) *stack.FuncObject {
	var (
		funcObject *stack.FuncObject
		function   *sym.Func
	)
	symbol := v.at.GetSymbolOfNode()[ctx]
	switch symbol.(type) {
	case *sym.Func:
		function = symbol.(*sym.Func)
	case *sym.Variable:
		// symbol 是函数变量类型
		variable := symbol.(*sym.Variable)
		value := v.getLeftValue(variable).GetValue()
		functionObject, ok := value.(*stack.FuncObject)
		if ok {
			function = functionObject.GetFunction()
			return functionObject
		}

	default:
		name := ctx.IDENTIFIER().GetText()
		log.RuntimePanic(ctx, fmt.Sprintf("unable find function %s", name))

	}

	funcObject = stack.NewFuncObject(function)
	return funcObject
}

// 构建函数调用的参数值 myfunc(2+2+a) 2+2+a 的值
func (v *Visitor) buildParamValues(ctx *parser.FunctionCallContext) []interface{} {