1: <?php
 2: 
 3: namespace BN\Compiler\Grammar;
 4: 
 5: use BN\Compiler\Parser\Operator\OperatorOrder;
 6: use BN\Compiler\Postfix\Operator\CallbackEvaluator;
 7: use BN\Compiler\Postfix\Operands\FixedCount;
 8: use BN\Compiler\Postfix\Operands\AtLeastN;
 9: 
10: class OperatorBuilder
11: {
12:     private $precedence;
13:     private $isLeftAssociative;
14:     private $operands;
15:     private $evaluator;
16: 
17:     public function precedence($precedence)
18:     {
19:         $this->precedence = $precedence;
20:         return $this;
21:     }
22: 
23:     public function leftAssociative()
24:     {
25:         $this->isLeftAssociative = true;
26:         return $this;
27:     }
28: 
29:     public function rightAssociative()
30:     {
31:         $this->isLeftAssociative = false;
32:         return $this;
33:     }
34: 
35:     public function unary($callback)
36:     {
37:         return $this->operator(1, $callback);
38:     }
39: 
40:     public function binary($callback)
41:     {
42:         return $this->operator(2, $callback);
43:     }
44: 
45:     public function operator($fixedOperandsCount, $callback)
46:     {
47:         $this->operands = new FixedCount($fixedOperandsCount);
48:         $this->evaluator = new CallbackEvaluator($callback);
49:         return $this;
50:     }
51: 
52:     public function aggregate($callback)
53:     {
54:         $this->operands = new AtLeastN(1);
55:         $this->evaluator = $callback;
56:         return $this;
57:     }
58: 
59:     public function buildOrder()
60:     {
61:         return new OperatorOrder($this->precedence, $this->isLeftAssociative);
62:     }
63: 
64:     public function buildEvaluator()
65:     {
66:         return $this->evaluator;
67:     }
68: 
69:     public function buildOperands()
70:     {
71:         return $this->operands;
72:     }
73: }
74: