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package stack
type Stack struct {
size int
height int
data []int
next *Stack // Pointer to the next element in the stack stack
}
func NewStack(size int, next *Stack) *Stack {
return &Stack{
size: size,
height: 0,
data: make([]int, size),
next: next,
}
}
func (s *Stack) Clear() {
s.height = 0
}
func (s *Stack) Duplicate() {
if s.height > 0 {
s.Push(s.data[s.height-1])
} else {
s.Push(0)
s.Push(0)
}
}
func (s *Stack) Pop() int {
if s.height > 0 {
s.height--
return s.data[s.height]
}
return 0
}
func (s *Stack) Push(value int) {
if s.height >= s.size {
s.size += 32
s.data = append(s.data, make([]int, 32)...)
}
s.data[s.height] = value
s.height++
}
func (s *Stack) Swap() {
a := s.Pop()
b := s.Pop()
s.Push(a)
s.Push(b)
}
func (s Stack) GetHeights() []int {
if s.next != nil {
return append(s.next.GetHeights(), s.height)
} else {
return []int{s.height}
}
}
func (toss *Stack) Transfert(soss *Stack, n int) {
// Implements a value transfert between two stacks, intended for use with the '{'
// (aka begin) and '}' (aka end) stackstack commands
toss.height += n
if toss.height > toss.size {
toss.data = append(toss.data, make([]int, toss.height-toss.size)...)
toss.size = toss.height
}
for i := 1; i <= min(soss.height, n); i++ {
toss.data[toss.height-i] = soss.data[soss.height-i]
for i := min(soss.height, n) + 1; i <= n; i++ {
toss.data[toss.height-i] = 0
}
}
soss.height -= n
if soss.height < 0 {
soss.height = 0
}
}
func (s Stack) Next() *Stack {
return s.next
}
func (s *Stack) Discard(n int) {
// Implements a discard mechanism intended for use with the '}'(aka end) stackstack command
s.height -= n
if s.height < 0 {
s.height = 0
}
}
func (s *Stack) YCommandPick(n int, h int) {
if n > s.height {
s.height = 1
s.data[0] = 0
} else {
v := s.data[s.height-n]
s.height = h
s.Push(v)
}
}
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