package shsh

type TokenStack struct {
    buffer []*Token
    int capacity
}

func (s *Stack) Push(v *Token) {
    s.capacity++
    *s.buffer = append(*s.buffer, v)
}

func (s *Stack) Pop() *Token {
    if s.capacity <= 0 {
        return nil
    }

    s.capacity--
    res := *s.buffer[len(*s.buffer) - 1]
    *s = *s.buffer[ :len(*s) - 1]
    return ret
}