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<?php
namespace PhpOffice\PhpSpreadsheet\Calculation\Engine;
class CyclicReferenceStack
{
/**
* The call stack for calculated cells.
*
* @var mixed[]
*/
private $stack = [];
/**
* Return the number of entries on the stack.
*
* @return int
*/
public function count()
{
return count($this->stack);
}
/**
* Push a new entry onto the stack.
*
* @param mixed $value
*/
public function push($value): void
{
$this->stack[$value] = $value;
}
/**
* Pop the last entry from the stack.
*
* @return mixed
*/
public function pop()
{
return array_pop($this->stack);
}
/**
* Test to see if a specified entry exists on the stack.
*
* @param mixed $value The value to test
*
* @return bool
*/
public function onStack($value)
{
return isset($this->stack[$value]);
}
/**
* Clear the stack.
*/
public function clear(): void
{
$this->stack = [];
}
/**
* Return an array of all entries on the stack.
*
* @return mixed[]
*/
public function showStack()
{
return $this->stack;
}
}
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