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<?php |
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namespace Helix\DB\Fluent; |
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use Closure; |
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use Helix\DB; |
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use Helix\DB\EntityInterface; |
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use Helix\DB\Select; |
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/** |
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* A logical expression that evaluates to a boolean. |
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*/ |
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class Predicate extends Expression implements ValueInterface |
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{ |
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/** |
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* Null-safe equality {@link Predicate} from mixed arguments. |
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* |
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* If `$a` is an integer (enumerated item), returns `$b` as a {@link Predicate} |
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* |
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* If `$b` is a closure, returns from `$b($a, DB $this)` |
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* |
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* If `$b` is an {@link EntityInterface}, the ID is used. |
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* |
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* If `$b` is an array, returns `$a IN (...quoted $b)` |
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* |
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* If `$b` is a {@link Select}, returns `$a IN ($b->toSql())` |
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* |
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* Otherwise predicates upon `$a = quoted $b` |
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* |
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* @param scalar $a |
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* @param null|scalar|array|Closure|EntityInterface|Select|ValueInterface $b |
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* @return static |
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*/ |
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public static function match(DB $db, $a, $b): Predicate |
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{ |
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if ($b instanceof Closure) { |
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return $b->__invoke($a, $db); |
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} |
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if (is_int($a)) { |
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return static::factory($db, $b); |
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} |
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if (is_array($b)) { |
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return static::factory($db, "{$a} IN ({$db->quoteList($b)})"); |
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} |
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if ($b instanceof Select) { |
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return static::factory($db, "{$a} IN ({$b->toSql()})"); |
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} |
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if ($b === null) { |
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return static::factory($db, "{$a} IS NULL"); |
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} |
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return static::factory($db, "{$a} = {$db->quote($b)}"); |
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} |
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/** |
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* Logical `AND` |
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* |
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* `($this AND ...)` |
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* |
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* @param string ...$predicates |
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* @return Predicate |
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*/ |
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public function lAnd(string ...$predicates) |
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{ |
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array_unshift($predicates, $this); |
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return static::factory($this->db, sprintf('(%s)', implode(' AND ', $predicates))); |
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} |
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/** |
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* Logical `NOT` |
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* |
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* `NOT($this)` |
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* |
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* @return static |
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*/ |
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public function lNot() |
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{ |
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return static::factory($this->db, "NOT({$this})"); |
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} |
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/** |
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* Logical `OR` |
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* |
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* `($this OR ...)` |
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* |
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* @param string ...$predicates |
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* @return Predicate |
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*/ |
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public function lOr(string ...$predicates) |
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{ |
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array_unshift($predicates, $this); |
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return static::factory($this->db, sprintf('(%s)', implode(' OR ', $predicates))); |
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} |
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} |
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