1: <?php
 2: namespace Pharborist\Operators;
 3: 
 4: use Pharborist\ExpressionNode;
 5: use Pharborist\Token;
 6: 
 7: /**
 8:  * A boolean '!' operation.
 9:  */
10: class BooleanNotNode extends UnaryOperationNode {
11: 
12:   /**
13:    * Creates a negated version of any expression. For instance, passing a
14:    * VariableNode will result in !$var.
15:    *
16:    * @param \Pharborist\ExpressionNode $expr
17:    *  The expression to negate.
18:    *
19:    * @return static
20:    */
21:   public static function fromExpression(ExpressionNode $expr) {
22:     $not = new static();
23:     $not->addChild(Token::not(), 'operator');
24:     /** @var \Pharborist\Node $expr */
25:     $not->addChild($expr->remove(), 'operand');
26:     return $not;
27:   }
28: 
29: }
30: