1: <?php
 2: 
 3: namespace BN\Compiler\Postfix;
 4: 
 5: use BN\Collections\Stack;
 6: use BN\Compiler\Token\Token;
 7: use BN\Compiler\Token\TokenType;
 8: 
 9: class StackAccumulator
10: {
11:     private $errorHandler;
12:     private $stack;
13:     private $continueInCalculation;
14: 
15:     public function __construct(CalculatorErrorHandler $errorHandler)
16:     {
17:         $this->errorHandler = $errorHandler;
18:         $this->stack = new Stack();
19:     }
20: 
21:     public function init()
22:     {
23:         $this->stack->clear();
24:         $this->continueInCalculation = true;
25:     }
26: 
27:     public function continueInCalculation()
28:     {
29:         return $this->continueInCalculation;
30:     }
31: 
32:     public function pushToken(Token $token)
33:     {
34:         $this->stack->push($token);
35:     }
36: 
37:     public function pushNumber($number)
38:     {
39:         $this->pushToken(
40:             new Token(TokenType::NUMBER, $number)
41:         );
42:     }
43: 
44:     public function stopCalculation()
45:     {
46:         $args = func_get_args();
47:         $method = array_shift($args);
48: 
49:         $this->continueInCalculation = false;
50:         call_user_func_array(array($this->errorHandler, $method), $args);
51:     }
52: 
53:     public function getStack()
54:     {
55:         return $this->stack;
56:     }
57: 
58:     public function getResult()
59:     {
60:         $size = $this->stack->size();
61:         if ($size == 1) {
62:             return $this->stack->pop()->value;
63:         } elseif ($size > 0) {
64:             $this->stopCalculation('missingOperator', $size);
65:         }
66:         return 0;
67:     }
68: }
69: