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import stack
type
StackStack* = object
height: int
head: ref Stack
func NewStackStack*(): ref StackStack =
result = new(StackStack)
result.head = NewStack()
result.height = 1
func Pop*(ss: StackStack): int =
return ss.head[].Pop()
func Push*(ss: StackStack, v: int) =
ss.head[].Push(v)
func PopVector*(ss: StackStack): (int, int) =
return ss.head[].PopVector()
func PushVector*(ss: var StackStack, v: tuple[x, y: int]) =
ss.head[].PushVector(v)
func Clear*(ss: var StackStack) =
ss.head[].Clear()
func Begin*(ss: var StackStack, v: tuple[x, y: int]) =
inc ss.height
let soss = ss.head
let n = soss[].Pop()
ss.head = NewStack(size = abs(n), next = soss)
let toss = ss.head
if n > 0:
toss[].Transfert(soss[], n)
elif n < 0:
for i in 0 ..< -n:
soss[].Push(0)
soss[].PushVector(v)
func End*(ss: var StackStack, v: var tuple[x, y: int]): bool =
## Implements the '}' command behaviour which pops a stack from the stack stack
## returns true if a reflect should happen
if ss.height == 1:
return true
let toss = ss.head
let soss = toss[].Next()
let n = toss[].Pop()
v.y = soss[].Pop()
v.x = soss[].Pop()
if n > 0:
soss[].Transfert(toss[], n)
else:
soss[].Discard(-n)
dec ss.height
ss.head = soss
return false
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