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| 1 | <?php |
| 2 | |
| 3 | declare(strict_types=1); |
| 4 | |
| 5 | namespace Cosray\Finder\Output; |
| 6 | |
| 7 | use Cosray\Context; |
| 8 | use Cosray\Exception\ParserOutputException; |
| 9 | use Cosray\Finder\Input\Token; |
| 10 | use Cosray\Finder\Input\TokenType; |
| 11 | |
| 12 | final readonly class NullComparison extends Expression implements Output |
| 13 | { |
| 14 | public function __construct( |
| 15 | private Token $left, |
| 16 | private Token $operator, |
| 17 | private Token $right, |
| 18 | private Context $context, |
| 19 | private array $builtins, |
| 20 | ) {} |
| 21 | |
| 22 | public function get(): string |
| 23 | { |
| 24 | // Both compile to a subquery rather than to an operand, so there is |
| 25 | // nothing to put on the left of `IS NULL`. |
| 26 | foreach ([$this->left, $this->right] as $token) { |
| 27 | if ($token->type === TokenType::Path || $token->type === TokenType::Reference) { |
| 28 | throw new ParserOutputException( |
| 29 | $token, |
| 30 | 'Path and reference expressions cannot be compared to null.', |
| 31 | ); |
| 32 | } |
| 33 | } |
| 34 | |
| 35 | switch ($this->operator->type) { |
| 36 | case TokenType::Equal: |
| 37 | return $this->getSqlExpression(true); |
| 38 | case TokenType::Unequal: |
| 39 | return $this->getSqlExpression(false); |
| 40 | } |
| 41 | |
| 42 | throw new ParserOutputException( |
| 43 | $this->operator, |
| 44 | 'Only equal (=) or unequal (!=) operators are allowed in queries with an null value.', |
| 45 | ); |
| 46 | } |
| 47 | |
| 48 | private function getSqlExpression(bool $equal): string |
| 49 | { |
| 50 | return sprintf( |
| 51 | '%s %s %s', |
| 52 | $this->getOperand($this->left, $this->context->db, $this->builtins, $this->context), |
| 53 | $equal ? 'IS' : 'IS NOT', |
| 54 | $this->getOperand($this->right, $this->context->db, $this->builtins, $this->context), |
| 55 | ); |
| 56 | } |
| 57 | } |