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<?php |
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declare(strict_types=1); |
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namespace ChumakovAnton\Calculator; |
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/** |
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* Class ExpressionStackItem |
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* @package ChumakovAnton\Calculator |
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*/ |
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class ExpressionStackItem |
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{ |
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/** @var float */ |
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protected $operand; |
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/** @var Operation */ |
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protected $operation; |
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/** @var ExpressionStackItem */ |
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protected $subExpression; |
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/** @var ExpressionStackItem */ |
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protected $nextExpression; |
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/** @var ExpressionStackItem */ |
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protected $parentExpression; |
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/** |
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* ExpressionStackItem constructor. |
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* @param Operation $operation |
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* @param float $operand |
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*/ |
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public function __construct(Operation $operation, float $operand = 0) |
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{ |
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$this->operand = $operand; |
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$this->operation = $operation; |
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} |
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/** |
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* @return int |
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*/ |
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public function getOperationPriority(): int |
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{ |
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return $this->operation->getPriority(); |
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} |
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/** |
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* @return ExpressionStackItem |
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*/ |
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public function getNextExpression(): ?ExpressionStackItem |
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{ |
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return $this->nextExpression; |
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} |
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/** |
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* @param ExpressionStackItem $nextExpression |
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* @return ExpressionStackItem|null |
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*/ |
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public function setNextExpression(?ExpressionStackItem $nextExpression): ?ExpressionStackItem |
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{ |
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$this->nextExpression = $nextExpression; |
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return $this->nextExpression; |
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} |
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/** |
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* @return ExpressionStackItem |
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*/ |
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public function getParentExpression(): ?ExpressionStackItem |
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{ |
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return $this->parentExpression; |
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} |
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/** |
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* @return float |
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*/ |
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protected function getOperand(): float |
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{ |
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return $this->operand; |
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} |
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/** |
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* @param float $operand |
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*/ |
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public function setOperand(float $operand): void |
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{ |
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$this->operand = $operand; |
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} |
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/** |
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* @param Operation $operation |
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*/ |
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public function setOperation(Operation $operation): void |
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{ |
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$this->operation = $operation; |
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} |
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/** |
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* @return Operation|null |
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*/ |
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public function getOperation(): ?Operation |
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{ |
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return $this->operation; |
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} |
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/** |
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* @return null|ExpressionStackItem |
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*/ |
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public function getSubExpression(): ?ExpressionStackItem |
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{ |
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return $this->subExpression; |
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} |
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/** |
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* @param null|ExpressionStackItem $subExpression |
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* @return ExpressionStackItem|null |
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*/ |
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protected function setSubExpression(?ExpressionStackItem $subExpression): ?ExpressionStackItem |
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{ |
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$this->subExpression = $subExpression; |
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return $this->subExpression; |
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} |
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protected function excludeSubExpression(): void |
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{ |
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$this->setSubExpression($this->subExpression->getSubExpression()); |
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} |
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protected function excludeNextExpression(): void |
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{ |
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$this->setSubExpression($this->nextExpression->getSubExpression()); |
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$this->setNextExpression($this->nextExpression->getNextExpression()); |
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} |
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/** |
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* @param ExpressionStackItem $expressionStackItem |
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* @return ExpressionStackItem|null |
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*/ |
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public function appendSubExpression(ExpressionStackItem $expressionStackItem): ?ExpressionStackItem |
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{ |
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$expressionStackItem->parentExpression = $this; |
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return $this->setSubExpression($expressionStackItem); |
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} |
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/** |
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* @param ExpressionStackItem $expressionStackItem |
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* @return ExpressionStackItem|null |
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*/ |
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public function appendNextExpression(ExpressionStackItem $expressionStackItem): ?ExpressionStackItem |
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{ |
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$expressionStackItem->parentExpression = $this; |
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return $this->setNextExpression($expressionStackItem); |
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} |
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/** |
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* @return float |
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* @throws Exception\DivisionByZeroException |
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*/ |
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public function calculate(): float |
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{ |
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while (!empty($this->nextExpression) || !empty($this->subExpression)) { |
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if (!empty($this->subExpression)) { |
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$this->subExpression->calculate(); |
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$this->executeOperation($this->subExpression); |
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$this->excludeSubExpression(); |
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} |
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if (!empty($this->nextExpression)) { |
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$this->executeOperation($this->nextExpression); |
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$this->excludeNextExpression(); |
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} |
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} |
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return $this->operand; |
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} |
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/** |
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* @param ExpressionStackItem $expressionStackItem |
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* @throws Exception\DivisionByZeroException |
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*/ |
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protected function executeOperation(ExpressionStackItem $expressionStackItem): void |
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{ |
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$result = $this->operation->execute($this->operand, $expressionStackItem->getOperand()); |
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$this->setOperand($result); |
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$this->setOperation($expressionStackItem->getOperation()); |
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} |
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} |
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ChumakovAnton /
Calculator
