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package pointer
type StackStack struct {
head *Stack
height int
}
func NewStackStack() *StackStack {
return &StackStack{
head: NewStack(),
height: 1,
}
}
func (ss *StackStack) Begin(p *Pointer) {
ss.height++
soss := ss.head
n := soss.Pop()
np := n
if np < 0 {
np = -np
}
toss := &Stack{
size: np,
data: make([]int, np),
next: soss,
}
ss.head = toss
if n > 0 {
toss.height = n
elts := soss.height - n
if elts < 0 {
elts = soss.height
} else {
elts = n
}
for i := 1; i <= elts; i++ {
toss.data[toss.height-i] = soss.data[soss.height-i]
}
soss.height -= elts
} else if n < 0 {
for i := 0; i < np; i++ {
soss.Push(0)
}
}
x, y := p.GetStorageOffset()
soss.Push(x)
soss.Push(y)
p.CalculateNewStorageOffset()
}
func (ss *StackStack) End(p *Pointer) (reflect bool) {
if ss.height == 1 {
return true
}
soss := ss.head.next
n := ss.head.Pop()
y := soss.Pop()
x := soss.Pop()
p.SetStorageOffset(x, y)
if n > 0 {
if n > ss.head.height {
for i := n; i > ss.head.height; i-- {
soss.Push(0)
}
n = ss.head.height
}
soss.height += n
if soss.size < soss.height {
soss.data = append(soss.data, make([]int, soss.height-soss.size)...)
soss.size = soss.height
}
for i := n; i > 0; i-- {
soss.data[soss.height-i] = ss.head.data[ss.head.height-i]
}
} else if n < 0 {
soss.height += n
if soss.height < 0 {
soss.height = 0
}
}
ss.height--
ss.head = ss.head.next
return false
}
func (ss *StackStack) Under() (reflect bool) {
if ss.height == 1 {
return true
}
n := ss.head.Pop()
if n > 0 {
for i := 0; i < n; i++ {
ss.head.Push(ss.head.next.Pop())
}
} else {
for i := 0; i < -n; i++ {
ss.head.next.Push(ss.head.Pop())
}
}
return false
}
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