74 lines
1.2 KiB
PHP
74 lines
1.2 KiB
PHP
|
<?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;
|
||
|
|
}
|
||
|
|
}
|