//StoneBoxMan - Games/SimpleStack
//Version: v1.0
//Author: Okamiroy

// A simple stack implemented by array. Here I use it to save every move for the function of undoing.

var DataArray = []

func Push(trace)
  DataArray.Add(trace)

// Get the top element and delete it in stack
func Pop()
  var resultTrace = null
  ?DataArray.Count() > 0
    resultTrace = DataArray[DataArray.Count() - 1]
    DataArray.RemoveAt(DataArray.Count() - 1)
  :
    resultTrace = null
  return resultTrace

// Get the top element
func GetTop()
  var resultTrace = null
  ?DataArray.Count() > 0
    resultTrace = DataArray[DataArray.Count() - 1]
  :
    resultTrace = null
  return resultTrace

func Count()
  return DataArray.Count()

func Clear()
  DataArray.Clear()