Method pushStack

visitor.go:38–74

** 栈帧入栈 */

(frame *stack.Frame)

栈帧入栈
*/
func (v *Visitor) pushStack(frame *stack.Frame) {
	// todo crossoverJie parentFrame 设置
	if !v.stack.IsEmpty() {
		// 栈顶开始查找
		for i := v.stack.Size() - 1; i > 0; i-- {
			f := v.stack.Get(i).(*stack.Frame)

			// 函数是一等公民时，需要根据变量的作用域进行判断
			funcObject, ok := frame.GetObject().(*stack.FuncObject)

			// 新写入的栈帧的 parent 与当前的 parent 相同时
			if f.GetScope().GetEncloseScope() == frame.GetScope().GetEncloseScope() {
				frame.SetParent(f.GetParent())
				break
			} else if f.GetScope() == frame.GetScope().GetEncloseScope() {
				// 新写入的栈帧是某个已有的栈帧的下级
				frame.SetParent(f)
				break
			} else if ok {
				referenceVariable := funcObject.GetReferenceVariable()
				if referenceVariable != nil && referenceVariable.GetEncloseScope() == f.GetScope() {
					frame.SetParent(f)
					break
				}
			}

		}

		if frame.GetParent() == nil {
			// 上一级作用域作为本级作用域的父级
			frame.SetParent(v.stack.Peek().(*stack.Frame))
		}

	}

	v.stack.Push(frame)
}

func (v *Visitor) popStack() {
	v.stack.Pop()