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<?php
namespace PhpOffice\PhpSpreadsheet\Calculation\Engine;
use PhpOffice\PhpSpreadsheet\Calculation\Exception;
class BranchPruner
{
/**
* @var bool
*/
protected $branchPruningEnabled = true;
/**
* Used to generate unique store keys.
*
* @var int
*/
private $branchStoreKeyCounter = 0;
/**
* currently pending storeKey (last item of the storeKeysStack.
*
* @var ?string
*/
protected $pendingStoreKey;
/**
* @var string[]
*/
protected $storeKeysStack = [];
/**
* @var bool[]
*/
protected $conditionMap = [];
/**
* @var bool[]
*/
protected $thenMap = [];
/**
* @var bool[]
*/
protected $elseMap = [];
/**
* @var int[]
*/
protected $braceDepthMap = [];
/**
* @var null|string
*/
protected $currentCondition;
/**
* @var null|string
*/
protected $currentOnlyIf;
/**
* @var null|string
*/
protected $currentOnlyIfNot;
/**
* @var null|string
*/
protected $previousStoreKey;
public function __construct(bool $branchPruningEnabled)
{
$this->branchPruningEnabled = $branchPruningEnabled;
}
public function clearBranchStore(): void
{
$this->branchStoreKeyCounter = 0;
}
public function initialiseForLoop(): void
{
$this->currentCondition = null;
$this->currentOnlyIf = null;
$this->currentOnlyIfNot = null;
$this->previousStoreKey = null;
$this->pendingStoreKey = empty($this->storeKeysStack) ? null : end($this->storeKeysStack);
if ($this->branchPruningEnabled) {
$this->initialiseCondition();
$this->initialiseThen();
$this->initialiseElse();
}
}
private function initialiseCondition(): void
{
if (isset($this->conditionMap[$this->pendingStoreKey]) && $this->conditionMap[$this->pendingStoreKey]) {
$this->currentCondition = $this->pendingStoreKey;
$stackDepth = count($this->storeKeysStack);
if ($stackDepth > 1) {
// nested if
$this->previousStoreKey = $this->storeKeysStack[$stackDepth - 2];
}
}
}
private function initialiseThen(): void
{
if (isset($this->thenMap[$this->pendingStoreKey]) && $this->thenMap[$this->pendingStoreKey]) {
$this->currentOnlyIf = $this->pendingStoreKey;
} elseif (
isset($this->previousStoreKey, $this->thenMap[$this->previousStoreKey])
&& $this->thenMap[$this->previousStoreKey]
) {
$this->currentOnlyIf = $this->previousStoreKey;
}
}
private function initialiseElse(): void
{
if (isset($this->elseMap[$this->pendingStoreKey]) && $this->elseMap[$this->pendingStoreKey]) {
$this->currentOnlyIfNot = $this->pendingStoreKey;
} elseif (
isset($this->previousStoreKey, $this->elseMap[$this->previousStoreKey])
&& $this->elseMap[$this->previousStoreKey]
) {
$this->currentOnlyIfNot = $this->previousStoreKey;
}
}
public function decrementDepth(): void
{
if (!empty($this->pendingStoreKey)) {
--$this->braceDepthMap[$this->pendingStoreKey];
}
}
public function incrementDepth(): void
{
if (!empty($this->pendingStoreKey)) {
++$this->braceDepthMap[$this->pendingStoreKey];
}
}
public function functionCall(string $functionName): void
{
if ($this->branchPruningEnabled && ($functionName === 'IF(')) {
// we handle a new if
$this->pendingStoreKey = $this->getUnusedBranchStoreKey();
$this->storeKeysStack[] = $this->pendingStoreKey;
$this->conditionMap[$this->pendingStoreKey] = true;
$this->braceDepthMap[$this->pendingStoreKey] = 0;
} elseif (!empty($this->pendingStoreKey) && array_key_exists($this->pendingStoreKey, $this->braceDepthMap)) {
// this is not an if but we go deeper
++$this->braceDepthMap[$this->pendingStoreKey];
}
}
public function argumentSeparator(): void
{
if (!empty($this->pendingStoreKey) && $this->braceDepthMap[$this->pendingStoreKey] === 0) {
// We must go to the IF next argument
if ($this->conditionMap[$this->pendingStoreKey]) {
$this->conditionMap[$this->pendingStoreKey] = false;
$this->thenMap[$this->pendingStoreKey] = true;
} elseif ($this->thenMap[$this->pendingStoreKey]) {
$this->thenMap[$this->pendingStoreKey] = false;
$this->elseMap[$this->pendingStoreKey] = true;
} elseif ($this->elseMap[$this->pendingStoreKey]) {
throw new Exception('Reaching fourth argument of an IF');
}
}
}
/**
* @param mixed $value
*/
public function closingBrace($value): void
{
if (!empty($this->pendingStoreKey) && $this->braceDepthMap[$this->pendingStoreKey] === -1) {
// we are closing an IF(
if ($value !== 'IF(') {
throw new Exception('Parser bug we should be in an "IF("');
}
if ($this->conditionMap[$this->pendingStoreKey]) {
throw new Exception('We should not be expecting a condition');
}
$this->thenMap[$this->pendingStoreKey] = false;
$this->elseMap[$this->pendingStoreKey] = false;
--$this->braceDepthMap[$this->pendingStoreKey];
array_pop($this->storeKeysStack);
$this->pendingStoreKey = null;
}
}
public function currentCondition(): ?string
{
return $this->currentCondition;
}
public function currentOnlyIf(): ?string
{
return $this->currentOnlyIf;
}
public function currentOnlyIfNot(): ?string
{
return $this->currentOnlyIfNot;
}
private function getUnusedBranchStoreKey(): string
{
$storeKeyValue = 'storeKey-' . $this->branchStoreKeyCounter;
++$this->branchStoreKeyCounter;
return $storeKeyValue;
}
}
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