1: <?php
 2: namespace Pharborist\Operators;
 3: 
 4: use Pharborist\ExpressionNode;
 5: use Pharborist\Node;
 6: use Pharborist\ParentNode;
 7: 
 8: /**
 9:  * A binary operation.
10:  */
11: abstract class BinaryOperationNode extends ParentNode implements ExpressionNode {
12:   /**
13:    * @var ExpressionNode
14:    */
15:   protected $left;
16: 
17:   /**
18:    * @var Node
19:    */
20:   protected $operator;
21: 
22:   /**
23:    * @var ExpressionNode
24:    */
25:   protected $right;
26: 
27:   /**
28:    * @return ExpressionNode
29:    */
30:   public function getLeftOperand() {
31:     return $this->left;
32:   }
33: 
34:   /**
35:    * @param ExpressionNode $operand
36:    * @return $this
37:    */
38:   public function setLeftOperand(ExpressionNode $operand) {
39:     /** @var Node $operand */
40:     $this->left->replaceWith($operand);
41:     return $this;
42:   }
43: 
44:   /**
45:    * @return Node
46:    */
47:   public function getOperator() {
48:     return $this->operator;
49:   }
50: 
51:   /**
52:    * @return ExpressionNode
53:    */
54:   public function getRightOperand() {
55:     return $this->right;
56:   }
57: 
58:   /**
59:    * @param ExpressionNode $operand
60:    * @return $this
61:    */
62:   public function setRightOperand(ExpressionNode $operand) {
63:     /** @var Node $operand */
64:     $this->right->replaceWith($operand);
65:     return $this;
66:   }
67: }
68: