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<?php
namespace PhpOffice\PhpSpreadsheet\Calculation\Token;
use PhpOffice\PhpSpreadsheet\Calculation\Calculation;
class Stack
{
/**
* The parser stack for formulae.
*
* @var mixed[]
*/
private $stack = [];
* Count of entries in the parser stack.
* @var int
private $count = 0;
* Return the number of entries on the stack.
* @return int
public function count()
return $this->count;
}
* Push a new entry onto the stack.
* @param mixed $type
* @param mixed $value
* @param mixed $reference
public function push($type, $value, $reference = null)
$this->stack[$this->count++] = [
'type' => $type,
'value' => $value,
'reference' => $reference,
];
if ($type == 'Function') {
$localeFunction = Calculation::localeFunc($value);
if ($localeFunction != $value) {
$this->stack[($this->count - 1)]['localeValue'] = $localeFunction;
* Pop the last entry from the stack.
* @return mixed
public function pop()
if ($this->count > 0) {
return $this->stack[--$this->count];
return null;
* Return an entry from the stack without removing it.
* @param int $n number indicating how far back in the stack we want to look
public function last($n = 1)
if ($this->count - $n < 0) {
return $this->stack[$this->count - $n];
* Clear the stack.
public function clear()
$this->stack = [];
$this->count = 0;