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<?php
namespace PhpOffice\PhpSpreadsheet\Calculation\Token;
use PhpOffice\PhpSpreadsheet\Calculation\Calculation;
use PhpOffice\PhpSpreadsheet\Calculation\Engine\BranchPruner;
class Stack
{
/**
* @var BranchPruner
*/
private $branchPruner;
/**
* The parser stack for formulae.
*
* @var mixed[]
*/
private $stack = [];
/**
* Count of entries in the parser stack.
*
* @var int
*/
private $count = 0;
public function __construct(BranchPruner $branchPruner)
{
$this->branchPruner = $branchPruner;
}
/**
* Return the number of entries on the stack.
*/
public function count(): int
{
return $this->count;
}
/**
* Push a new entry onto the stack.
*
* @param mixed $value
*/
public function push(string $type, $value, ?string $reference = null): void
{
$stackItem = $this->getStackItem($type, $value, $reference);
$this->stack[$this->count++] = $stackItem;
if ($type == 'Function') {
$localeFunction = Calculation::localeFunc($value);
if ($localeFunction != $value) {
$this->stack[($this->count - 1)]['localeValue'] = $localeFunction;
}
}
}
public function pushStackItem(array $stackItem): void
{
$this->stack[$this->count++] = $stackItem;
}
/**
* @param mixed $value
*/
public function getStackItem(string $type, $value, ?string $reference = null): array
{
$stackItem = [
'type' => $type,
'value' => $value,
'reference' => $reference,
];
// will store the result under this alias
$storeKey = $this->branchPruner->currentCondition();
if (isset($storeKey) || $reference === 'NULL') {
$stackItem['storeKey'] = $storeKey;
}
// will only run computation if the matching store key is true
$onlyIf = $this->branchPruner->currentOnlyIf();
if (isset($onlyIf) || $reference === 'NULL') {
$stackItem['onlyIf'] = $onlyIf;
}
// will only run computation if the matching store key is false
$onlyIfNot = $this->branchPruner->currentOnlyIfNot();
if (isset($onlyIfNot) || $reference === 'NULL') {
$stackItem['onlyIfNot'] = $onlyIfNot;
}
return $stackItem;
}
/**
* Pop the last entry from the stack.
*/
public function pop(): ?array
{
if ($this->count > 0) {
return $this->stack[--$this->count];
}
return null;
}
/**
* Return an entry from the stack without removing it.
*/
public function last(int $n = 1): ?array
{
if ($this->count - $n < 0) {
return null;
}
return $this->stack[$this->count - $n];
}
/**
* Clear the stack.
*/
public function clear(): void
{
$this->stack = [];
$this->count = 0;
}
}
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