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| 1 | <?php |
| 2 | |
| 3 | namespace CirrusSearch\Parser\AST; |
| 4 | |
| 5 | use CirrusSearch\Parser\AST\Visitor\Visitor; |
| 6 | use Wikimedia\Assert\Assert; |
| 7 | |
| 8 | /** |
| 9 | * Negated node |
| 10 | * NOTE: may not appear in any resulting query AST, |
| 11 | * NegatedNode are always removed and attached to a BooleanClause |
| 12 | * as MUST_NOT. |
| 13 | */ |
| 14 | class NegatedNode extends ParsedNode { |
| 15 | |
| 16 | /** |
| 17 | * @var ParsedNode |
| 18 | */ |
| 19 | private $child; |
| 20 | |
| 21 | /** |
| 22 | * @var string type of negation used |
| 23 | */ |
| 24 | private $negationType; |
| 25 | |
| 26 | /** |
| 27 | * @param int $startOffset |
| 28 | * @param int $endOffset |
| 29 | * @param ParsedNode $child |
| 30 | * @param string $negationType |
| 31 | */ |
| 32 | public function __construct( $startOffset, $endOffset, ParsedNode $child, $negationType ) { |
| 33 | Assert::parameter( self::validNegationType( $negationType ), 'negationType', 'Invalid negation type provided' ); |
| 34 | parent::__construct( $startOffset, $endOffset ); |
| 35 | $this->child = $child; |
| 36 | $this->negationType = $negationType; |
| 37 | } |
| 38 | |
| 39 | /** |
| 40 | * @return array |
| 41 | */ |
| 42 | public function toArray() { |
| 43 | return [ 'not' => array_merge( parent::baseParams(), [ |
| 44 | 'negation_type' => $this->negationType, |
| 45 | 'child' => $this->child->toArray(), |
| 46 | ] ) ]; |
| 47 | } |
| 48 | |
| 49 | /** |
| 50 | * @return ParsedNode |
| 51 | */ |
| 52 | public function getChild() { |
| 53 | return $this->child; |
| 54 | } |
| 55 | |
| 56 | /** |
| 57 | * Check whether this negation type is valid |
| 58 | * @param string $negationType |
| 59 | * @return bool |
| 60 | */ |
| 61 | public static function validNegationType( $negationType ) { |
| 62 | return $negationType === '!' || $negationType === '-' || $negationType === 'NOT'; |
| 63 | } |
| 64 | |
| 65 | /** |
| 66 | * @return string type of negation used (NOT, ! or -) |
| 67 | */ |
| 68 | public function getNegationType() { |
| 69 | return $this->negationType; |
| 70 | } |
| 71 | |
| 72 | /** |
| 73 | * @param Visitor $visitor |
| 74 | */ |
| 75 | public function accept( Visitor $visitor ) { |
| 76 | $visitor->visitNegatedNode( $this ); |
| 77 | } |
| 78 | } |